• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Drive device (1) for a molding machine (2), in particular for an injection molding machine, with at least one hydraulically driven pressure cushion (3), via which a spar (4) or a movable platen (5) of the molding machine (2) can be moved to apply the clamping force, A conveying device (6) for conveying a hydraulic fluid, the conveying device (6) having a conveying cylinder (61), a conveying chamber (62) formed in the conveying cylinder (61) and filled with hydraulic fluid, and a conveying piston (63) movable in the conveying chamber (62) , wherein the delivery piston (63) divides the delivery space (62) into a first space (64) and a second space (65), and a hydraulic line system (7) filled with hydraulic fluid, via which the delivery device (6) with the pressure cushion ( 3) is connected, wherein a shut-off device (8) for interrupting the connection of the pressure pad (3) with the conveying device (6) and the one Most space (64) with the second space (65) connecting connecting line (70) for conveying hydraulic fluid between the spaces (64, 65) provided by the shut-off device (8) interrupted connection of the pressure pad (3) with the conveying device (6) are.
    公开号:AT521696A4
    申请号:T50085/2019
    申请日:2019-02-01
    公开日:2020-04-15
    发明作者:Ing Herbert Zeidlhofer Dipl；Ing Lukas Riegler Dipl；Ing Dipl (Fh) Günter Schott
    申请人:Engel Austria Gmbh；
    IPC主号:
    专利说明:

    The present invention relates to a drive device for a shaping machine, in particular for an injection molding machine, with at least one hydraulically driven pressure cushion, via which a spar or a movable platen of the shaping machine can be moved for applying clamping force, a conveying device for conveying hydraulic fluid, the conveying device being a conveying cylinder, has a delivery chamber formed in the delivery cylinder and filled with hydraulic fluid and a delivery piston movable in the delivery chamber, the delivery piston dividing the delivery chamber into a first room and a second room, and a hydraulic line system filled with hydraulic fluid, via which the delivery device is connected to the pressure cushion. In addition, the invention relates to a molding machine with such a drive device.
    A wide variety of drive devices have already been implemented on the closing side of the shaping machine in order to carry out the closing and opening movement of the movable platen. The closing movement is divided into two sections, namely the rapid stroke, in which the platen covers a relatively long path with relatively little force, and the build-up of clamping force, in which the platen hardly covers a path, and the platen by a relatively high force are pressed together.
    The use of hydraulically operated pressure cushions has been known for many years, particularly for carrying out the clamping force build-up. The rapid stroke can either also be carried out via these pressure cushions or a rapid stroke device separate from the pressure cushion can be provided.
    An example of the use of pressure cushions for the build-up of clamping force in a vertical clamping unit of a shaping machine can be found in DE 10 2016 006 108 A1.
    EP 1 388 404 B shows a hydraulic unit for an injection molding machine with a drive that has an actuating mechanism and a hydraulic one
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    Force translator is in operative connection with a functional unit. An actuating movement of the input cylinder can be converted into a corresponding movement of the output cylinder. To compensate for a leak between the pressure chambers, a referencing device is provided, by means of which the pressures can be corrected. A directional valve is provided to connect the inlet and outlet lines.
    EP 1 331 079 B1 shows a two-platen locking system of an injection molding machine, double-acting locking pressure pistons mounted in locking pressure cylinders being assigned to the fixed platen. The closing of the clamping unit in rapid traverse is triggered by a spindle, which is driven by a drive motor via a toothed belt, whereby various valves are switched accordingly. To build up the clamping force, by turning the spindle further in the closing direction, hydraulic fluid is fed from a pressure chamber through an open valve into the closing chambers of the closing pressure cylinder. After this valve has been closed, the desired shooting pressure is locked in for the duration of the spraying process, the pressurized hydraulic fluid acting in the closing pressure chambers on the annular piston surfaces of the four closing pressure pistons. A disadvantage of this device is that the spindle is lubricated directly via the hydraulic oil, since hydraulic oil has an unfavorable viscosity for the lubrication. As a result, the wear on the spindle is very high and the service life is very short, which is why such a spindle often has to be replaced, which in turn is complex. Furthermore, it is disadvantageous that hydraulic oil has to be supplied to the closing force side of the chamber of the closing pressure piston via the rapid stroke, which drastically increases the volume required. However, this must then be compressed again via the spindle, which requires a rather large compression stroke, which in turn leads to a large overall length. In addition, a tank is required in this device, which in turn requires a lot of installation space. The long lines and the tank also multiply the amount of hydraulic oil required in the system.
    EP 2 242 633 B1 shows a linear drive for generating an actuating movement and for applying a large holding force. It is similarly disadvantageous as in the previously cited document that on the one hand a tank is also necessary here and that
    3/39 on the other hand the spindle is lubricated directly in the unfavorable hydraulic oil. It is also disadvantageous that all the force has to be absorbed directly by the spindle. This document also shows a suboptimal combination of drive power and the required installation space.
    At the outset, those movements (rapid stroke and closing force build-up) that - together with the opening - are carried out during each shaping cycle were described in more detail. However, there are also movements that are not carried out with every shaping cycle, but that are much less frequent. One such movement is the mold height adjustment. This is usually necessary when a new mold is mounted on the platen. Depending on the height of the mold, the closed position changes. This means that, depending on the mold height, the platen plates are at different distances from each other in the closed position. In other words, in the case of a spar machine, the relative position of the movable platen relative to the spar is changed, so that both the starting position before closing and the position when the clamping force is applied are shifted in accordance with the change in form height. Various solutions are already known for carrying out a corresponding mold height adjustment when changing tools.
    For example, EP 1 321 272 B1 shows a device for adjusting the installation height of a tool, an adjustment element being positively connected to each spar, which can be adjusted axially relative to the spar via a central drive. The adjustment elements can be locked by means of a locking device. The locking device is designed as a displaceable piston.
    DE 10 2015 011 425 A1 shows a clamping unit for a molding machine with a mold height adjustment device.
    Both documents show devices that are relatively complex. This means that quite complex additional components and structures are necessary for the tool changes that are carried out relatively rarely.
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    The object of the present invention is therefore one against the
    State of the art to provide improved drive device. In particular, the disadvantages mentioned should be eliminated. The should particularly preferably
    Drive device can be made simpler, cheaper and / or smaller and still be able to perform the necessary movements.
    This is achieved by a drive device with the features of claim 1. Accordingly, it is provided according to the invention that the drive device has a shut-off device for interrupting the connection of the pressure pad to the conveying device and a connecting line connecting the first space to the second space for conveying hydraulic fluid between the spaces when the pressure pad is interrupted by the shut-off device to the conveying device.
    With the present invention it is possible that the starting position of the pressure pad is changed by the conveying device. This means that the mold height to which the drive device is designed is adjusted. The conveying device is not only used for applying clamping force, but is also used for stile positioning. The conveyor device forms a mold height adjustment device together with the pressure pad. A change in the spar position can thus be carried out in a simple manner when changing the tool. The solution is also very compact.
    Preferred embodiments of the present invention are specified in the dependent claims.
    The pressure pad is designed as a piston-cylinder unit for simple operation. According to a preferred embodiment, it is provided that the pressure cushion has a cushion cylinder, a pressure cushion space formed in the cushion cylinder and filled with hydraulic fluid and a cushion piston movable in the pressure cushion space, the cushion piston dividing the pressure cushion space into a closing pressure space and an opening pressure space.
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    Hydraulic fluid is a fluid that is required to transfer energy (volume flow, pressure) in hydraulic systems in fluid technology. Under the term
    Hydraulic fluid drops hydraulic fluids or corresponding mixtures from one
    Liquid and gas. A hydraulic oil is preferably used as the hydraulic fluid.
    It should generally be stated that the delivery device is designed as a piston pump.
    The first space and / or the second space of the delivery space can be designed as a pressure space. This means that this room is pressurized with (hydraulic) pressure.
    The lines of the hydraulic line system can be of any design as long as sufficient pressurization of the conveying device and the pressure cushion is possible. The lines of the hydraulic line system also include the terms hose, bore, pipe, etc.
    It is preferably provided that the hydraulic line system has a first hydraulic line which connects the closing pressure chamber of the pressure cushion to the first chamber of the conveying device. In addition, it can be provided that the hydraulic line system has a second hydraulic line, which connects the opening pressure space of the pressure pad with the second space of the conveying device. In addition, it can be provided that the hydraulic line system has a connecting line which connects the first hydraulic line and the second hydraulic line.
    Furthermore, it can preferably be provided that a first switching element, preferably for carrying out a conveying device empty stroke, is arranged in the first hydraulic line between a branch to the connecting line and the closing pressure space and / or that a second switching element is located in the second hydraulic line between a branch to the connecting line and the opening pressure space , preferably for performing a conveyor device empty stroke
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    It is particularly preferably provided that the connecting line consists of the part of the first hydraulic line which extends from the first pressure chamber to the branch
    Link line is sufficient, composed of the link line and the part of the second hydraulic line, which extends from the branching of the link line to the second pressure chamber.
    In order to make it possible to shut off, it is preferably provided that the first switching element and the second switching element can be brought into a closed position, preferably for carrying out an empty device lifting stroke of the conveying piston of the conveying device. Thus, the first switching element and the second switching element together form the shut-off device.
    Each switching element is preferably designed as a fluidic switching element. Specifically, a switchable valve or a cartridge valve can be used as the switching element.
    In order to carry out a pressure cushion stroke, it can preferably be provided that a third switching element is arranged in the connecting line. It is preferably provided that the first switching element and the second switching element can be brought into an open position and the third switching element can be brought into a closed position in order to carry out a height adjustment stroke of the cushion piston of the pressure cushion.
    In order to be able to dispense with a tank, it is preferably provided that the pressure cushion chamber, the delivery chamber and the hydraulic line system form a closed hydraulic circuit.
    Furthermore, it is preferably provided that the hydraulic line system, preferably in the area of the connecting line, is connected to a storage device, preferably a bladder accumulator. Such a hydraulic accumulator serves to compensate for the (minimum) differential volume due to the compression of the hydraulic fluid.
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    Especially if a storage device is provided, it makes sense for the storage device to be connected to the connecting line via a branch line branching off the connecting line, the connecting line between the branch line and the first hydraulic line preferably being used to carry out the mold height adjustment stroke into a closed position bringable - the third switching element is arranged and a fourth switching element is arranged in the connecting line between the branch line and the second hydraulic line - preferably to bring the mold height adjustment stroke into a closed position.
    Furthermore, it is preferably provided that the conveyor device is designed as a two-stage force converter. It is preferably provided that the second pressure chamber is formed in two parts - with an axially outer partial space which is annular in cross section and with a separate, axially inner partial space.
    Especially in the case of a delivery device designed as a two-stage force booster, it is useful if the first hydraulic line has a first branch line and a second branch line, the first branch line being connected to the axially outer, annular partial space and the second branch line being connected to the axially inner partial space. It can also preferably be provided that a fifth switching element is arranged in the second branch line and a sixth switching element is arranged in the first branch line.
    According to a preferred embodiment, it is provided that the conveyor device can be driven by an electric drive. In particular, it is provided that the feed piston can be moved by the electric drive relative to the feed cylinder, preferably linearly.
    Protection is also sought after for a molding machine, especially an injection molding machine, with a lifting device according to the invention. It is preferably provided that the molding machine has an injection unit and a clamping unit, the clamping unit comprising a machine bed, a fixed platen connected to the machine bed, and an am
    8/39
    Machine bed movably mounted platen, wherein the movable platen can be driven by the drive device.
    There are two fundamentally common ways of designing molding machines, namely as two or three-plate machines with bars or as tie bar-less machines.
    In the first variant, it is provided that the clamping unit has four spars that pass through the mold mounting plates, each spar being connected to a cushion piston of a pressure cushion of the drive device.
    In the second variant, it is provided that the clamping unit is designed without a tie bar, the cushion piston being connected to the movable platen and the cushion cylinder being connected to an end plate of the clamping unit attached to the machine bed or being formed in this end plate.
    Further details and advantages of the present invention are explained in more detail below with reference to the description of the figures and with reference to the exemplary embodiments illustrated in the drawings. In it show:
    1 is a schematic side view of a shaping machine in the form of a spar machine with a drive device,
    2 is a schematic side view of a shaping machine in the form of a tie bar-less machine with a drive device,
    3 schematically shows in detail a drive device together with a conveying device, hydraulic line system and pressure pad,
    4 shows the switching position of the drive device during the first idle stroke of the molding stroke,
    5 shows the switching position of the drive device during the first adjustment stroke of the molding stroke,
    6 shows the switching position of the drive device during the second idle stroke of the molding stroke,
    7 shows the switching position of the drive device during the second adjustment stroke of the molding stroke,
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    8 shows the new starting position after the molding stroke has ended,
    9 shows a switching position of the drive device during position tolerance compensation,
    Fig. 10 shows the switching position of the drive device when building the
    Closing force,
    11 shows the switching position of the drive device while maintaining the closing force,
    Fig. 12 shows the switching position of the drive device during compression for the
    Closing force reduction
    13 shows the switching position of the drive device when the closing force is reduced,
    Fig. 14 shows the switching position of the drive device when the
    Spars or the transmission rod,
    15 shows the starting position of the drive device,
    16 shows the switching position of the drive device when an increased opening force is applied,
    17 shows a schematic illustration of the drive device with a conveying device in the form of a single-stage pressure intensifier,
    18 shows the drive device with a conveying device arranged in the cushion piston in the form of a single-stage pressure intensifier and
    19 shows the drive device with a conveying device arranged in the cushion piston in the form of a two-stage pressure intensifier.
    1 shows a schematic side view of a shaping machine 2 with an exemplary drive device 1. In this case, the shaping machine 2 is designed as a two-plate machine with bars 4. The molding machine 2 has the clamping unit 12 and the injection unit 11 as main components.
    The injection unit 11 is only shown schematically. With the injection unit, liquid material, e.g. B. plastic or metal melt, are introduced into a cavity formed in the molding tool 16. The initially liquid material hardens in the cavity to form a shaping part, which is then removed from the shaping tool 16, in particular ejected.
    10/39
    The clamping unit 12 has a machine bed 13 (also called a frame), a fixed mold mounting plate 14 fixedly connected to the machine bed 13 and the mold mounting plate 5 movably mounted on the machine bed 13. In addition, the clamping unit 12 has the bars 4, which pass through the two platen 5 and 14. In the area of the movable platen 5, locking devices 17 are arranged, which at least partially axially surround the bars 4. With these locking devices 17, the platen 5 is fixed to the spars 4 when the shaping tool 16 is closed, or is held in a positive or non-positive manner. In the locking position of the locking device 17, the application of closing force is made possible. The locking devices 17 can each have half-shells 17a and 17b (also called locking nuts), which can be connected to the spars 4 in a positive or non-positive manner, preferably by clamping. A mold half 16a and 16b is mounted on each of the two platen plates 5 and 14. Together, the two mold halves 16a and 16b form the molding tool 16. In the closed state, at least one cavity is formed in the molding tool 16 (not shown).
    The clamping unit 12 has a drive device 1 with which the mold mounting plates 5 and 14 and thus also the mold halves 16a and 16b can be moved relative to one another. The drive device 1 can be designed such that it has its own rapid lifting device for carrying out the rapid stroke (relatively long distance with relatively little force). This rapid lifting device can be designed, for example, in the form of a spindle drive or in the form of a toggle lever system. Such a rapid lifting device can be arranged in the (left-hand) area of the movable platen 5 and can move it relative to the fixed platen 14. No rapid lifting device is shown in FIG.
    The drive device 1 also has a plurality of pressure cushions 3 for applying the closing force. A pressure cushion is described in more detail below as an example. The pressure pad 3 has a pad cylinder 30 which is connected to the fixed platen 14. The pressure pad 3 can, for example, be attached to the fixed platen 14 or be integrated into it. A pressure cushion space 31 is formed in the cushion cylinder 30, which
    11/39 is filled with hydraulic fluid (e.g. hydraulic oil). A cushion piston 32 is mounted in a linearly movable manner in the pressure cushion chamber 31. The cushion piston 32 divides the pressure cushion chamber 31 into a closing pressure chamber 33 and into an opening pressure chamber 34. The cushion piston 32 is connected to a spar 4. The pressure pad 3 is connected to a conveying device 6 via a hydraulic line system 7. The pressure cushion 3, together with the hydraulic line system 7 and the conveying device 6, forms the drive device 1. If no separate rapid lifting device is provided, both the rapid stroke and the application of the closing force are carried out with this drive device 1. The conveying device 6 serves to convey hydraulic fluid from and to the pressure cushion 3. The conveying device 6 has a conveying cylinder 61, a conveying chamber 62 formed in the conveying cylinder 61 and a conveying piston 63 movable in the conveying chamber 62. The conveying piston 63 divides the conveying space 62 into a first space 64 and into a second space 65. Since in this case the conveying device 6 is designed as a two-stage force booster, the first space 64 has an axially outer part space 66 and an axially inner (smaller) part space 67 on. The feed piston 63 is connected to a feed rod 68 which divides the first space 64 into the two sub-spaces 66 and 67. The feed piston 63 is connected to an electric drive 10 (shown schematically) via a drive rod 69. The delivery piston 63 can be moved in translation in the delivery cylinder 61 via the electric drive 10. The electric drive 10 can be designed, for example, as a rotating hollow shaft motor, which linearly drives the drive rod 69, which is partially designed as a spindle, via a spindle nut. The position of the conveyor 6 can be chosen freely. As shown, the conveying device 6 can be arranged somewhere separately from the pressure pad 3. The conveyor device 6 can also be integrated into the fixed platen 14 or integrated into the pressure pad 3.
    2, the shaping machine 2 is designed as a tie bar-less machine, only the closing unit 12 being shown. In this tie-bar-less machine, only a relatively large pressure pad 3 is provided. This pressure pad 3 is integrated in the end plate 15 in this case. The end plate 15 is attached to the machine bed 13. The cushion cylinder 30 is formed by the end plate 15 or is fastened to it (as already described). The pressure cushion space 31 is in the cushion cylinder 30
    12/39, in which the cushion piston 32 is in turn movable. This cushion piston 32 is connected to the movable platen 5 via a transmission rod 18. The movable platen 5 can be moved along the machine longitudinal axis M relative to the fixed platen 14 via the transmission rod 18 (or via a separate drive). A locking device 17 is also provided in this embodiment. The cushion piston 32 divides the pressure cushion chamber 31 into a closing pressure chamber 33 and an opening pressure chamber 34. The pressure cushion 3 is connected to the conveying device 6 via the hydraulic line system 7. The hydraulic line system 7 and its function will be described in more detail later.
    3 to 8, the drive device 1 is shown schematically when a molding stroke is carried out. In this case, the drive device (consisting of pressure cushion 3, hydraulic line system 7, conveyor device 6 and electric drive 10) acts as a mold height adjustment device.
    3 to 8, the conveying device 6, the hydraulic line system 7 and the pressure pad 3 are shown in such a way that they are formed in the fixed platen 14 (or in the end plate 15). Of course, different designs and arrangements can also be provided.
    All components of the hydraulic line system 7 are explained in more detail with reference to FIG. 3. In general, the hydraulic line system 7 connects the conveying device 6 to the pressure cushion 3.
    The hydraulic line system 7 has a second hydraulic line 72, which connects the opening pressure chamber 34 of the pressure cushion 3 to the second chamber 65 of the conveying device 6. The second hydraulic line 72 has a branch 75 to the connecting line 73, the branch 75 dividing the second hydraulic line 72 into a delivery section 72.6 and a pressure cushion section 72.3. In the pressure pad section 72.3 of the second hydraulic line 72 there is a
    13/39 second switching element (switchable valve) 82 arranged. This switching element 82 can assume an open position OS and a closed position SS.
    The hydraulic line system 7 has a first hydraulic line 71, which connects the closing pressure chamber 33 of the pressure cushion 3 to the first chamber 64 of the conveying device 6. The first space 64 is composed of the axially outer part space 66 and the axially inner part space 67. The first hydraulic line 71 has a branch 76 to the connecting line 73, the branch 76 dividing the first hydraulic line 71 into a delivery section 71.6 and a pressure cushion section 71.3. A first switching element 81 is arranged in the pressure cushion section 71.3. The first hydraulic line 71 (in particular its delivery section 71.6) comprises a first branch line 71a, which is connected to the axially outer part space 66, and a second branch line 71b, which is connected to the axially inner part space 67. The first branch line 71a is divided into two sections by the branch 77. A sixth switching element 85 is arranged in the first branch line 71a. A fifth switching element 86 is arranged in the second branch line 71b.
    The hydraulic line system 7 has a connecting line 73 which connects the first hydraulic line 71 and the second hydraulic line 72. The connection line 73 forms, together with (the delivery section 71.6) of the first hydraulic line 71 and (the delivery section 72.6) of the second hydraulic line, the connection line 70. In the area of the connection line 73, the hydraulic line system 7 has a storage device 9. The storage device 9 is connected to the connection line 73 via a branch line 74. A third switching element 83 is arranged in the connecting line 73 between the branch line 74 and the first hydraulic line 71. A fourth switching element 84 is arranged in the connecting line 73 between the branch line 74 and the second hydraulic line 72.
    All switching elements 81 to 86 are connected to a control device (not shown). This control device can be connected in terms of signal technology to a control or regulating unit of the entire shaping machine 2 (likewise not shown) or integrated into this control or regulating unit
    Be 14/39. The switching states (especially the open position OS and the closed position SS) of the switching elements 81 to 86 can be controlled via the control device, preferably as a function of stored program sequences.
    In the figures described below, only the components that are most important for the function described in each case are provided with a reference symbol. Otherwise, the description applies to the figures described so far.
    3 shows a starting position for the start of a molding stroke. Such a molding stroke is carried out when the molding tool 16 is changed. Since the newly installed shaping tool 16 usually has a different mold height (measured along the machine longitudinal axis M), the starting position of the mold mounting plates 5 and 14 relative to one another must also be changed. This starting position can be illustrated on the basis of the relative position of cushion piston 32 to cushion cylinder 30. 3, the cushion piston 32 is located relatively far to the right, that is to say a rather large shaping tool 16 is mounted. If a smaller shaping tool 16 with a lower mold height is now clamped in, the starting position must be changed by the cushion piston 32 moving further to the left in the cushion cylinder 30. This is illustrated by the fact that the position of the cushion piston 32 is to be shifted from the first starting position A1 (larger mold height) to the second starting position A2 (lower mold height).
    In Fig. 4 the (first) idle stroke takes place. For this purpose, the first switching element 81 and the second switching element 82 are switched to their closed position SS. The other switching elements (valves) 83 to 86 are each in the open position OS. In this idle stroke, the two switching elements (valves) 81 and 82 in the pressure cushion sections 71.3 and 71.6 form a shut-off device 8 for interrupting the connection of the pressure cushion 3 to the conveying device 6. When the conveying piston 63 of the conveying device 6 passes through in this switching position of the switching elements 81 to 86 the electric drive 10 is shifted (to the left), hydraulic fluid is pumped from the first space 64 into the second space 65. Since the shut-off device 8 interrupts the connection between the pressure pad 3 and the conveying device 6, there is (still) no movement of the pressure pad 3 and thus of the
    15/39
    Holms 4. Due to the favorable geometric design, relatively little is
    Hydraulic fluid is pushed into the storage device 9. More specifically, only that is
    Amount pushed into the storage device 9 over the axially inner
    Partial space 67 is promoted (since the circular ring surfaces of the second space 65 and the axially outer partial space 66 are ideally designed the same).
    5, a (first) mold height adjustment stroke is then carried out. For this purpose, the first switching element and the second switching element 82 are switched to the open position OS, while the third switching element 83 is switched to the closed position SS. The other switching elements 84 to 86 remain in the open position OS. As soon as in this switching position of the switching elements 81 to 86 the delivery piston 63 of the delivery device 6 is moved (to the right) by the electric drive, hydraulic fluid is conveyed from the second chamber 65 into the opening pressure chamber 34 via the second hydraulic line 72 and on the other hand via the first hydraulic line 71 Hydraulic fluid is conveyed from the closing pressure chamber 33 into the first chamber 64. As a result, the cushion piston 32 moves to the left in the pressure cushion chamber 31 in the direction of the second starting position A2. During this adjustment stroke of the conveying device 6, the differential volume is also shifted from the storage device 9 into the opening pressure space 34.
    Depending on how far the spar 4 has to be moved due to the changed mold height, this process (idle stroke & adjustment stroke) must be repeated.
    Accordingly, a further (second) idle stroke is shown in FIG. 6. Again, as in FIG. 4, the shut-off device 8 is activated to interrupt the connection of the pressure pad 3 to the conveying device 6. The connecting line 70 connecting the first space 64 to the second pressure space 65 for conveying hydraulic fluid between the spaces 64 and 65 is open when the pressure pad 3 is disconnected from the shut-off device 8 with the conveying device 6.
    7 shows a further (second) adjustment stroke. As in FIG. 6, the first switching element 81 and the second switching element 82 are located in FIG. 6 in order to carry out a mold height adjustment stroke of the cushion piston 32 of the pressure cushion 3
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    Open position OS and the third switching element 83 in the closed position SS, so that additional hydraulic fluid is conveyed from the conveying device 6 into the opening pressure chamber 34.
    The second starting position A2 is then reached in FIG. 8. The clamping unit 12 (and in particular its lifting device 1) is thus adapted to the shape height of the newly installed shaping tool 16.
    With the described lifting device 1, not only can a mold height adjustment (carried out comparatively rarely) be carried out, but the closing force can also be applied. This is explained in more detail below. For the sake of simplicity only, the switching elements 81 and 82 forming the shut-off device 8 are not shown (they are always in an open position OS).
    FIG. 9 illustrates how the position tolerance is compensated for when closing. (With a positive connection between the spar 4 and the locking device 17 (spar nut) 17, a compensation of the position tolerance of the groove geometry is carried out.) The third switching element 83 is in the closed position SS, while the other switching elements 84, 85 and 86 are in the open position OS . The switching elements 81 and 82 forming the shut-off device 8 are not shown. When the delivery piston 63 of the delivery device 6 is shifted to the left, the cushion piston 32 is shifted to the right, so that the flanks of the groove geometry of the spar 4 rest on those of the locking device 17. With this stroke we have a relatively large volume (adjustment of the spar 4 by e.g. 2 mm) with relatively small forces to be overcome (frictional force between the movable platen 5 and machine bed 13; inertial force at a hydraulic fluid pressure of 20 to 40 bar; frictional force between movable platen 5 and spar 4; frictional force between cushion cylinder 30 and cushion piston 32;) is required.
    10 shows the switch position when the closing force is built up. The sixth switching element 86 in the first branch line 71a of the delivery section 71.6 of the first hydraulic line 71 is in the closed position SS. The others
    17/39
    Switching elements 83 to 85 are in the open position OS. As a result of this switching position when the delivery piston 63 is shifted to the left, only the small cylindrical surface of the delivery rod 68 in the axially inner partial space 67 is used, so that a smaller force acts on the delivery piston 63 than when the entire piston area is used. If the delivery piston 63 is moved to the left, the cushion piston 32 and with it the spar 4 are moved further to the right in this switching position by the compression of the hydraulic fluid to approximately 300 bar and the closing force is thus built up. With this "stroke" - the spar 4 practically does not move anymore, it expands due to the pressurization - a relatively small volume (compression of the hydraulic fluid from approx. 20 bar to approx. 300 bar) with relatively large forces (approx. 7 up to 15 times as large as when compensating for the position tolerance).
    As soon as the closing force has been built up, the switching elements 83 to 85 are also switched to the closed position SS. As a result, the pressure in the closing pressure chamber 33 (and in the first hydraulic line 7 up to the switching elements 85 and 86) is locked in, so that the load on the conveying device 6 (conveying piston 63, drive rod 69 and electric drive 10) is as low as possible (see FIG. 11).
    12 shows that compression takes place before the actual closing force is reduced. For this purpose, the switching elements 83 to 85 are switched back to the open position OS. At the same time, the delivery piston 63 is moved to the left (in the direction of the clamping force build-up).
    13 then the clamping force is built up. For this purpose, the switching elements 83 to 86 remain in the same position as in FIG. 12. However, the delivery piston 63 of the delivery device 6 is moved to the right (in the direction of reducing the closing force), so that hydraulic fluid is conveyed into the opening pressure chamber 34 on the one hand and hydraulic fluid from the closing pressure chamber 33 on the other hand.
    14, the spar 4 is reset. For this purpose, the third switching element 83 is in the closed position SS. The other switching elements 84 to 86
    18/39 are in the open position OS. By moving the delivery piston 63 to the right, the cushion piston 32 is moved to the left.
    In Fig. 15 the starting position (A1 or A2, depending on the mold height) is reached again.
    FIG. 16 shows how an increased opening force can be applied and, if necessary, tearing open with the pressure pads 3. (This can also be done with an additional rapid stroke device with lower forces.) For this purpose, only the fourth switching element 84 is switched to the closed position SS. The other switching elements 83, 85 and 86 are in the open position OS. For supportive opening (displacement of the cushion piston 32 to the left), an additional pressure is applied in the opening pressure chamber 34 when the delivery piston 63 is moved (to the right) in the direction of reducing the closing force. With this stroke, a relatively small volume (compression of the hydraulic fluid to 20 to 40 bar) with relatively low forces (compression of the hydraulic fluid to 20 to 40 bar) is used, so that an increased opening force (for example of approximately 260 kN, depending on the size) is achieved. Due to the switching position of the switching elements 83 to 86, when the delivery piston 63 is shifted to the right, the ring surface of the delivery piston in the axially outer part space 66 is used as an effective piston area.
    17, the conveying device 6 is designed as a single-stage force converter. That is to say, the first pressure chamber 64 is designed as a one-part chamber (ring-shaped in cross section). Only one line in the form of the first hydraulic line 71 is connected to this first pressure chamber 64. The shut-off device 8 is formed here by the first switching element 81 in the pressure cushion section 71.3 of the first hydraulic line 71 and by the second switching element 82 in the pressure cushion section 72.3 of the second hydraulic line 72. The third switching element 83 and the fourth switching element 84 are arranged in the connecting line 73. The storage device 9 is connected to the connection line 73. The connecting line 73 forms, together with the delivery section 71.6 of the first hydraulic line 71 and the delivery section 72.6 of the second hydraulic line 72, the connecting line 70. The basic functions of this delivery device 6 in the form of a one-stage power converter are the same as in the two-stage
    19/39
    Power converter, which is why reference can be made to the above statements. The
    Differences lie in the fact that the one-stage construction of the conveying device requires a comparatively long stroke and subsequently a large installation space, or alternatively a high force on the conveying device 6 or the
    Electric drive 10 acts.
    18 shows in a cross section an embodiment in which the conveying device 6 is integrated in the pressure pad 3. Specifically, 32 cavities are formed in the cushion piston, with the delivery piston 63 of the conveying device 6, for example, being movably mounted in the cushion piston 32. The switching elements 81 to 84 and the associated lines of the hydraulic line system 7 are also formed in the cushion piston 32. The conveying device 6 in FIG. 18 - similar to that in FIG. 17 - is designed as a single-stage force converter.
    In contrast, an exemplary embodiment is shown in FIG. 19, in which the conveying device 6 is also formed or arranged in the cushion piston 32, but the conveying device 6 is designed as a two-stage pressure intensifier.
    All reference numerals in FIGS. 18 and 19 refer to the same components as in the other figures and exemplary embodiments. The functions of the individual components of this drive device 1 according to FIG. 18 or according to FIG. 19 are analogous to the previously described variants.
    20/39
    Reference symbol list:
    Drive device
    Molding machine
    Pressure pad
    Pillow cylinder
    Pressure cushion room
    Pillow plunger
    Closing pressure chamber
    Opening pressure chamber
    Holm movable platen
    Conveyor
    Conveyor cylinder
    Funding room
    Feed piston first space second space axially outer part space axially inner part space
    Conveyor bar
    Drive rod
    Hydraulic line system
    Connection line first hydraulic line
    71.3 Pressure pad section
    71.6 Funding section
    71a first branch line b second branch line second hydraulic line
    72.3 Pressure pad section
    72.6 Funding stage
    Link line
    Branch line
    Junction
    21/39
    Junction
    Junction
    Shut-off device first switching element second switching element third switching element fourth switching element fifth switching element sixth switching element
    Storage device
    Electric drive
    Injection unit
    Clamping unit
    Machine bed fixed platen
    Faceplate
    Shaping tool
    16a half mold
    16b half mold
    Locking device
    17a half-shell
    17b half-shell
    Transmission rod
    SS closed position
    OS open position
    M machine longitudinal axis
    A1 first starting position
    A2 second starting position
    Innsbruck, on February 1, 2019
    22/39
    81518 22 / eh
    权利要求:
    Claims (19)
    [1]
    Claims
    1. Drive device (1) for a molding machine (2), in particular for an injection molding machine, with
    - at least one hydraulically driven pressure cushion (3), via which a spar (4) or a movable platen (5) of the molding machine (2) can be moved to apply the clamping force,
    - A conveying device (6) for conveying a hydraulic fluid, the conveying device (6) comprising a conveying cylinder (61), a conveying chamber (62) formed in the conveying cylinder (61) and filled with hydraulic fluid, and a conveying piston (63) movable in the conveying chamber (62). The delivery piston (63) divides the delivery space (62) into a first space (64) and a second space (65), and
    - A hydraulic line system (7) filled with hydraulic fluid, via which the conveying device (6) is connected to the pressure cushion (3), characterized by
    - A shut-off device (8) for interrupting the connection of the pressure pad (3) with the conveying device (6) and
    - A connecting line (70) connecting the first space (64) to the second space (65) for conveying hydraulic fluid between the spaces (64, 65) when the pressure pad (3) is interrupted by the shut-off device (8) to the conveying device ( 6).
    [2]
    2. Drive device according to claim 1, characterized in that the pressure cushion (3) has a cushion cylinder (30), a pressure cushion chamber (31) formed in the cushion cylinder (30) and filled with hydraulic fluid and a cushion piston (32) movable in the pressure cushion chamber (31) , wherein the cushion piston (32) divides the pressure cushion chamber (31) into a closing pressure chamber (33) and into an opening pressure chamber (34).
    [3]
    3. Drive device according to claim 2, characterized in that the hydraulic line system (7)
    23/39
    a first hydraulic line (71), which connects the closing pressure chamber (33) of the pressure cushion (3) to the first chamber (64) of the conveying device (6),
    - A second hydraulic line (72) which connects the opening pressure space (34) of the pressure pad (3) with the second space (65) of the conveying device (6), and
    - A link line (73) which connects the first hydraulic line (71) and the second hydraulic line (72).
    [4]
    4. Drive device according to claim 3, characterized in that in the first hydraulic line (71) between a branch (76) to the connecting line (73) and the closing pressure chamber (33) a first switching element (81), preferably for performing a delivery device empty stroke, is arranged and / or in the second hydraulic line (72) between a branch (75) to the connecting line (73) and the opening pressure chamber (34) a second switching element (82), preferably for performing a conveyor device empty stroke, is arranged.
    [5]
    5. Drive device according to claim 4, characterized in that the first switching element (81) and the second switching element (82) can be brought into a closed position (SS) for carrying out a conveying device empty stroke of the conveying piston (63) of the conveying device (6), wherein the first switching element (81) and the second switching element (82) together form the shut-off device (8).
    [6]
    6. Drive device according to one of claims 1 to 5, characterized in that a third switching element (83) is arranged in the connecting line (73).
    [7]
    7. Drive device according to claim 6, characterized in that for performing a mold height adjustment stroke of the cushion piston (32) of the pressure cushion (3), the first switching element (81) and the second switching element
    24/39 (82) can be brought into an open position (OS) and the third switching element (83) can be brought into a closed position (SS).
    [8]
    8. Drive device according to one of claims 1 to 7, characterized in that the pressure cushion chamber (31), the delivery chamber (62) and the hydraulic line system (7) form a closed hydraulic circuit.
    [9]
    9. Drive device according to one of claims 1 to 8, characterized in that the hydraulic line system (7), preferably in the region of the connecting line (73), is connected to a storage device (9), preferably a bladder accumulator.
    [10]
    10. Drive device according to claim 9, characterized in that the storage device (9) is connected via a branch line (74) branching off from the connecting line (74) to the connecting line (73), wherein in the connecting line (73) between the branch line (74 ) and the first hydraulic line (71), the third switching element (83) is arranged, and a fourth switching element (84) is arranged in the connecting line (73) between the branch line (74) and the second hydraulic line (72).
    [11]
    11. Drive device according to one of claims 1 to 10, characterized in that the conveying device (6) is designed as a two-stage force booster, preferably by the second space (64) in two parts - with a cross-sectionally annular, axially outer partial space (66) and with a separate, axially inner subspace (67) is formed.
    [12]
    12. Drive device according to claim 11, characterized in that the first hydraulic line (71) has a first branch line (71a) and a second branch line (71b), wherein the first branch line (71a) with the axially outer, annular partial space (66) and the second branch line (71b) is connected to the axially inner part space (67).
    25/39
    [13]
    13. Drive device according to claim 12, characterized in that a fifth switching element (85) is arranged in the second branch line (71b) and a sixth switching element (86) is arranged in the first branch line (71a).
    [14]
    14. Drive device according to one of claims 1 to 13, characterized in that the conveyor device (6) can be driven by an electric drive (10).
    [15]
    15. Drive device according to claim 14, characterized in that the delivery piston (63) can be moved by the electric drive (10) relative to the delivery cylinder (61), preferably linearly.
    [16]
    16. Molding machine (2), in particular injection molding machine, with a drive device (1) according to at least one of the preceding claims.
    [17]
    17. Molding machine according to claim 16, with an injection unit (11) and a clamping unit (12), the clamping unit (12) being a machine bed (13), a fixed platen (14) connected to the machine bed (13) and the machine bed (14) 13) has a movably mounted platen (5), the movable platen (5) being drivable by the drive device (1).
    [18]
    18. Molding machine according to claim 17, characterized in that the clamping unit (12) has four spars (4) passing through the clamping plates (5, 14), each spar (4) each having a cushion piston (32) of a pressure cushion (3) the drive device (1) is connected.
    [19]
    19. Molding machine according to claim 17, characterized in that the clamping unit (12) is designed without a tie bar, the cushion piston (32) being connected to the movable platen (5) and the cushion cylinder (30).
    26/39 connected to an end plate (15) of the clamping unit (12) fastened to the machine bed (13) or formed in this end plate (15).
    Innsbruck, on February 1, 2019
    类似技术:
    公开号 | 公开日 | 专利标题
    DE3044137C2|1985-01-31|Mold clamping unit for receiving a plastic injection mold
    EP1534929A1|2005-06-01|Method for joining the functional parts of hydraulic or pneumatic working devices, and joining connection
    EP2773471B1|2016-03-23|Extruder and tube extruder or metal extrusion press
    DE2603891B2|1980-07-24|Drive for moving an injection piston of a die casting machine
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    EP1106275B1|2004-07-07|Apparatus for high pressure forming of a tubular member or blank
    DE2749430C3|1990-05-31|Indirect hollow extrusion press
    WO2004018120A1|2004-03-04|Main cylinder or press cylinder of an extrusion/ tube extrusion press
    DE4243735A1|1993-07-01|Hydraulic system for closing mould and maintaining it in closed position - has cylinders and a piston between two pressure chambers plus control valves and outlet line
    DE2923910A1|1980-06-19|PNEUMATIC, HYDROPNEUMATIC, HYDRAULIC OR OILHYDRAULIC PRESS, IN PARTICULAR HORIZONTAL, VERTICAL OR ANGLE DESIGN IN SINGLE USE OR IN COMBINATION WITH OTHER WORKING MACHINES, WITH KNEE LATCHES
    EP1958754A1|2008-08-20|Actuator device, in particular for a mobile component on a plastic injection machine or blow moulding machine
    DE10215072A1|2003-10-30|Hydraulic device for moving a machine part back and forth
    DE10143013A1|2003-03-20|Hydraulic assembly for injection molding machine closure and injection, includes reference instrument controlling compensation of internal leakage
    DE2112701C3|1978-09-07|Mold clamping device, in particular for injection molding machines that process plastics
    EP1389161B1|2007-11-21|Drive mechanism, particularly for a moveable part of a closing unit or the injection unit of a plastic injection moulding machine
    DE102018101727B4|2020-11-12|Piston-cylinder unit for a molding machine and a molding machine
    DE102005034202A1|2006-04-20|Hydraulically operated casting unit
    DE1583710A1|1970-08-20|Device for operating an injection molding device
    AT509907B1|2015-01-15|Locking unit for an injection molding machine
    AT17169U1|2021-07-15|Pressure pad for a platen of a molding machine
    DE102021120713A1|2022-03-10|Hydraulic drive device for a shaping machine
    DE3008715A1|1980-10-02|Hydraulic closing unit esp. for injection moulding machines - has reversing valve for alternate charging of cylinder chambers, with plunger piston
    EP1310346A1|2003-05-14|Clamping system for a plastic injection molding apparatus
    DE102013111001A1|2014-04-30|injection unit
    DE102017208423A1|2018-11-22|Drive order, machine and method
    同族专利:
    公开号 | 公开日
    AT521696B1|2020-04-15|
    DE102020102378A1|2020-08-06|
    DE102020102378B4|2022-02-24|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE2451054A1|1973-10-29|1975-04-30|Bata Ind Ltd|DEVICE FOR MOLDING SHOE SOLES OR DGL.|
    DE10220406A1|2001-07-02|2003-01-16|Bosch Rexroth Ag|Drive system, to move a mold part of an injection molding machine, has two piston/cylinder units with structured links between their pressure zones with a valve assembly, to give high dynamics|
    JP2009226449A|2008-03-24|2009-10-08|Toshiba Mach Co Ltd|Molding machine|AT17169U1|2020-02-28|2021-07-15|Engel Austria Gmbh|Pressure pad for a platen of a molding machine|DE10143013A1|2001-09-03|2003-03-20|Bosch Rexroth Ag|Hydraulic assembly for injection molding machine closure and injection, includes reference instrument controlling compensation of internal leakage|
    DE10161911C1|2001-12-17|2003-06-12|Battenfeld Gmbh|Adjustment mechanism for installation height of an injection molding tool has a locking mechanism to prevent play after a set position has been made|
    DE10202374A1|2002-01-23|2003-07-24|Krauss Maffei Kunststofftech|Twin plate closure system for an injection molding machine, comprises a fixed tensioning plate, a movable tensioning plate, and hydraulically actuated closure pistons|
    DE102008007793A1|2008-02-06|2009-08-13|Robert Bosch Gmbh|Linear drive with a spindle drive|
    AT14594U1|2014-09-04|2016-02-15|Engel Austria Gmbh|Closing unit for a molding machine|
    AT517261B1|2015-05-21|2017-05-15|Engel Austria Gmbh|Vertical clamping unit for a molding machine|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50085/2019A|AT521696B1|2019-02-01|2019-02-01|Drive device for a molding machine|ATA50085/2019A| AT521696B1|2019-02-01|2019-02-01|Drive device for a molding machine|
    DE102020102378.2A| DE102020102378B4|2019-02-01|2020-01-31|Driving device for a shaping machine and shaping machine|
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