• 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:
    Apparatus (36) comprising a source (37) for at least one liquid plastic component, said source (37) intermittently providing said at least one liquid plastic component for a metering device (38), between said source (37) for said at least one liquid plastic component and the dosing device (38) is arranged with a variable buffer volume (40) connected to the source (37) via an inlet opening (41) and to the dosing device (38) via an outlet opening (42).
    公开号:AT517359A4
    申请号:T432/2015
    申请日:2015-07-03
    公开日:2017-01-15
    发明作者:
    申请人:Sonderhoff Engineering Gmbh；
    IPC主号:
    专利说明:

    1
    The invention relates to a device having the features of the preamble of claim 1.
    In order to constantly provide enough liquid plastic component for the metering device, it is already known to provide two sources available, which work alternately intermittently. This is associated with a high design effort. There is also the problem that the switching point must be chosen correctly from one source to the other, so that no unwanted pressure drop takes place.
    The object of the present invention is to provide an improved over the prior art device in which these problems are avoided.
    This object is achieved by a device having the features of claim 1. Preferred embodiments are given in the subclaims.
    Accordingly, it is provided according to the invention that between the source for the at least one liquid plastic component and the metering device, a buffer device with a variable buffer volume connected via an input to the source and via an outlet to the metering device is arranged. This makes it possible to provide the liquid plastic components of the metering device without interruption with a single intermittently operating source without interruption. In this respect, the buffer device ensures that sufficient material is always available with sufficient pretensioning pressure. The buffer device itself does not have to act as a pump but is purely passive.
    An intermittently operating source is understood to mean not only a source whose delivery rate drops to zero (eg a piston pump), but also a source whose delivery rate, in particular pulsating, is subject to fluctuations (eg gear pump).
    Due to unavoidable friction losses, it is preferably provided that the prestressing pressure of the buffer device can be set particularly preferably via a, preferably pneumatic, proportional pressure valve.
    Contactor is also desired for a device for producing foamed plastic parts, in particular sealing beads, with a device according to the invention.
    Embodiments of the invention will be discussed with reference to the figures. Show it:
    Fig. I schematically shows an apparatus for producing foamed
    Plastic parts,
    2 shows a first embodiment of a piston pump, in which the pistons are coupled mechanically gegengleich,
    3 shows a variant of the embodiment of FIG. 2,
    4 shows an embodiment of the invention, in which the pistons are mechanically synchronously coupled,
    5 shows an embodiment of the invention in which the pistons are electrically coupled,
    6 shows an embodiment of the invention, wherein the one piston pump and the other piston pump are each designed alternately as an introduction device and as a delivery device,
    Fig. 7 in detail the buffer device and
    8 shows an alternative variant of the buffer device.
    Fig. 1 shows in its entirety schematically a device 100 for the production of foamed plastic parts, in particular of sealing beads. This device 100 again has several essential subunits.
    Such a subunit is formed by a device 16 for producing a mixture of at least one gas and at least one liquid plastic component. This device 16 in turn has at least one mixing device 17, a feed device 19 for the at least one gas connected to the mixing device 17 via a first line 18 and a conveying device 21 for the at least one liquid plastic component connected to the mixing device 17 via a second line 20. In addition, this device 16 has a container 53 for the plastic component and a gas source 54, in particular a compressed air generating device on. Instead of the container 53, a feed pump could also be provided.
    In such a device 16 is provided in contrast to the prior art that the introduction device 19 and the conveyor device 21 as piston 22 and 23 having piston pumps 25 and 24 are formed.
    The piston 22 of the introduction device 19 (piston pump 25) and the piston 23 of the conveying device 21 (piston pump 24) are in this example coupled mechanically in opposite directions via a pressure compensator 26. This allows the use of a drive operating at relatively low pressure (e.g., pneumatics) because of the force increase necessary to increase the force. In addition, intake valves 27, 28 and exhaust valves 29, 30 can be seen.
    As shown in greater detail in FIG. 2, these intake valves 27, 28 and exhaust valves 29, 30 are actuated by a control device 33 in response to the movement of the coupled pistons 22, 23. Shown is also a sensor 31, which communicates via a signal line 32 with the control device 33 for signal transmission. The sensor 31 is used to determine the position of the Druckfibersetzers 26th
    Thus, the position of the piston 22, 23 is determined. The position of the pistons 22, 23 can also be determined directly via the sensor 31 (see the further exemplary embodiments). In general, leakage detection can take place with such a sensor 31, namely when the piston seals between the piston 23 and the cylinder 34 of the introduction device 19, the piston seals between the piston 22 and the cylinder 35 of the conveyor 21 and / or at least one of the valves 27 to 30 are worn are. For leak detection, e.g. Inlet valve 28 and exhaust gas outlet valve 30 are closed. By the piston 22, a compression of the gas volume located between the inlet valve 28 and the outlet valve 30 is carried out. If a leek is present, after the compression has taken place an irregular movement of the pressure-fiber setter 26, which is detected by the sensor 31, occurs. It can also be checked, whether in the fluent
    Plastic component irregular gas fractions are present, since they lead to a movement of the piston 23 with closed inlet valve 27 and outlet valve 29, since the flfissige plastic component is compressible by the irregular gas components. If appropriate, this can be compensated by the control device 33.
    FIG. 3 shows a single piston pump, which simultaneously forms the piston pump 24 for the delivery device 21 and the piston pump 25 for the introduction device 19. In this variant, no separate Druckiibersetzer is provided, but rather a piston forms both the piston 23 of the piston pump 24 and the piston 22 of the piston pump 25. This system of FIG. 3 operates mechanically gegengleich. That is, when gas is applied via the delivery device 19 (shown below), liquid plastic component is introduced into the delivery device 21, and vice versa.
    In contrast, Fig. 4 shows a system in which the piston pumps 24 and 25 are mechanically synchronously coupled. Specifically, the piston 22 of the introduction device 19 and the piston 23 of the conveying device 21 are coupled via a coupling mechanism 63 such that when a gas is expelled from the introduction device 19 liquid plastic component from the conveyor 21 is applied and upon introduction of gas into the introduction device 19th flfissige plastic component is introduced into the conveyor 21.
    Fig. 5 shows an electronic coupling of the piston pumps 24 and 25. The movement of the pistons 22 and 23 is controlled by a control device 64, which communicates with drive devices of the two piston pump 24 and 25 in signal communication. The pistons 22 and 23 can be moved against or synchronously. This is adjustable via the control device 64.
    Fig. 6 shows a piston pump 25 and a piston pump 24, each of which alternately the introduction device 19 or the conveyor 21 form. An advantage here is that on both sides of the seals are alternately lubricated by the flfissige plastic component. A change is possible after a predefinable number of cycles. The change takes place via switching device 65 and 66, which can either be switched manually or preferably via a control device 67, preferably regularly switched. In the first switching position, the liquid plastic component is conveyed from the container 53 via a first line 68 to the piston pump 24 (shown above), while the gas is conveyed from the gas source 54 via the second line 69 to the piston pump 25. In this respect, the entire system is in this first switching position with Figs. 1 and 2 match. In the second switching position, however, a diversion takes place. Specifically, in this second switching position, the liquid plastic component from the container 53 Ciber a third line 70 for (shown below) piston pump 25 is promoted, while the gas is conveyed from the gas source 54 via a fourth line 71 to the piston pump 24. In this second switching position accordingly forms - the reverse to the first switching position - the piston pump 25, the conveyor 21 and the piston pump 24, the introduction device 19. Depending on the switching position is then the first line 18 and the second line 20, the liquid plastic component or the gas Blending device 17 further pumped.
    Returning to Fig. 1, another subunit of the device 100 is formed by a device 36 providing a liquid, preferably gas mixed, plastic component for a metering device 38. This device 36 has a source 37 for at least one liquid plastic component. Preferably, this source 37 is formed by a conduit which leads away from the already mentioned mixing device 17. Furthermore, this device 36 has an intermittently operating relay device for the at least one liquid plastic component. This intermittent forwarding device is formed by the piston pumps 24, 25, but may also be any other, arbitrarily designed device which is suitable to forward the liquid plastic component intermittently. By intermittently operating source is understood not only a source whose delivery rate drops to zero but also a source whose delivery is subject to strong fluctuations.
    The device 36 further has a metering device 38, preferably a metering pump, for which the plastic component is provided by the relay device. In addition, the device 36 has one between the source 37 for the at least one liquid plastic component and the
    Dosing device 38 arranged buffer device 39 with a variable buffer volume 40, through which the intermittently conveyed to the buffer device 39 liquid plastic component is always provided in sufficient quantity with sufficient biasing pressure for the metering device 38. After the metering device 38, the plastic component passes to a metering valve 60, after which the plastic component directly (see dashed lines shown DQse 61) -or indirectly as shown in Fig. 1 via a further mixing element 58 - discharged over a Diise 61 and by the application and thus accompanying pressure drop foams.
    In order to enable as constant a forwarding as possible, it is preferably provided that the pressure prevailing between the buffer device 39 and the metering device 38 in the liquid plastic component can be controlled by the buffer device 39. Via an inlet opening 41, the liquid plastic component passes from the source 37 into the buffer volume 40 of the buffer device 39. The buffer volume 40 is in turn connected to the metering device 38 via an outlet opening 42. In FIG. 1, the inlet opening 41 is formed in a wall of a housing 43 of the buffer device 39. This is also apparent in Fig. 7. Alternatively, however, it may also be provided that the inlet opening 41 is formed in a piston rod 44 of the buffer device 39 connected to a piston 45 (see FIG. 8). Furthermore, an inlet valve 51 is arranged upstream of the inlet opening and an outlet valve 52 downstream of the outlet opening 42. In addition, a displacement sensor 72 may be provided, with which at least selected positions of the piston 45 in the housing 43 can be determined.
    Furthermore, it is provided that a pressure sensor 46 is arranged on an output side of the metering device 38. This pressure sensor 46 is connected to a control device 47 via a control line 48 in connection. The control device 47 controls the buffer device 39 such that the pressure applied to the input side of the metering device 38 is tracked to the pressure prevailing on the output side of the metering device 38. Furthermore, the control device 47 may be designed to close both the inlet valve 51 and the outlet valve 52 and to compress the liquid plastic component located in the buffer volume 40. In addition, a sensor, not shown, can be provided, through which an irregular compression of the buffer volume 40 can be detected.
    Furthermore, the buffer device 39 is connected to a device 49 for pressurizing the buffer device 39. This can be controlled either by the control device 47 (dashed line) or by a separate control device 50.
    In principle, the two devices 16 and 36 would already suffice for the production of foamed plastic parts in the form of sealing beads. However, it can additionally be provided that a second plastic component parallel to the first plastic component or mixed with the first plastic component to the plastic part, preferably physically, foams. Therefore, a further subunit of the device 100 is formed by a device 62 for multi-component foaming (see again Fig. 1). This device 54 has a container 55 for a second plastic component, from which the, preferably mixed with gas, second plastic component via a metering device 56 and a metering valve 57 to the mixing element 58 is guided. In this mixing element 58, this second plastic component is mixed with the first plastic component. Subsequently, this mixture is applied to a further metering valve 59 via a diagrammatically indicated Diise 61, whereby the gas contained in the mixture foams. In other words, it comes through the application to a pressure drop, the gas brings the liquid plastic component for foaming and it is formed after curing of the foamed plastic component provided with a pores plastic part, for example in the form of a sealing bead 73rd
    In the metering valves 57 and / or 60 also check valves may be provided, as they are provided in FIG. 1 with the reference numerals 51 and 52 used as an inlet and outlet valve.
    LIST OF REFERENCE NUMBERS: 16 device 17 mixing device 18 first line 19 introduction device 20 second line 21 conveying device 22 piston 23 piston 24 piston pump 25 piston pump 26 pressure distributor 27 inlet valve 28 inlet valve 29 outlet valve 30 outlet valve 31 sensor 32 signal line 33 control device 34 cylinder 35 cylinder 36 Device for forwarding a liquid Plastic component 37 Source 38 Metering device 39 Buffer device 40 Buffer volume 41 Inlet port 42 Outlet port 43 Housing 44 Piston rod 45 Piston 46 Pressure sensor 47 Control device 48 Control line 49 Pressurization device 50 Control device 51 Inlet valve 52 Outlet valve 53 Container for plastic component 54 Gas source 55 Container for second plastic component 56 Mixing device 57 Dosing valve 58 mixing element 59 metering valve 60 metering valve 61 nozzle 62 device for multi-component foaming 63 coupling mechanism 64 control device 65 Schaltvorrich Device 66 Switching device 67 Control device 68 First line 69 Second line 70 Third line 71 Fourth line 72 Distance sensor 73 Sealing bead 100 Device for producing foamed plastic parts Innsbruck, July 2, 2015
    权利要求:
    Claims (12)
    [1]
    claims
    A device (36) having a source (37) for at least one liquid plastic component, the source (37) intermittently providing the at least one liquid plastic component for a metering device (38), characterized in that between the source (37) for the at least one liquid plastic component and the dosing device (38) is arranged with a variable buffer volume (40) via an inlet opening (41) to the source (37) and an outlet opening (42) connected to the dosing device (38) ,
    [2]
    2. Device (36) according to claim 1, characterized in that between the buffer device (39) and the metering device (38) prevailing in the liquid plastic component pressure by the buffer device (39) - preferably to a constant value - is controllable.
    [3]
    3. Device (36) according to at least one of the preceding claims, characterized in that on an output side of the metering device (38) a pressure sensor (46) is arranged, which is in communication with a control device (47), wherein the control device (47) Giber a control line (48), the buffer device (39) controls such that the pressure applied to an input side of the metering device (38) is nachgieghrt the pressure prevailing on the output side of the metering device (38).
    [4]
    4. Device (36) according to at least one of the preceding claims, characterized in that the source (37) of the buffer device (39) supplies or provides a gasified liquid plastic component.
    [5]
    5. Device (36) according to at least one of the preceding claims, characterized in that the inlet opening (41) or the outlet opening (42) in a wall of a housing (43) of the buffer device (39) is formed.
    [6]
    6. Device (36) according to at least one of the preceding claims, characterized in that the inlet opening (41) or the outlet opening (42) in a piston (45) connected to the piston rod (44) of the buffer device (39) is formed.
    [7]
    7. Device (36) according to at least one of the preceding claims, characterized in that the buffer device (39) with a controllable by a control device (47, 50) controllable device (49) for pressurizing the buffer device (39) is connected, which preferably pneumatically is trained.
    [8]
    8. Device (36) according to at least one of the preceding claims, characterized in that the device (36) is designed for producing a physically foamed plastic part.
    [9]
    9. Device (36) according to at least one of the preceding claims, characterized in that the buffer device (39) has a housing (43) movable piston (45), wherein preferably a displacement sensor for determining at least selected positions of the piston (45) is provided in the housing (43).
    [10]
    10. Device (36) according to at least one of the preceding claims, characterized in that in front of the inlet opening (41) an inlet valve (51) and after the outlet opening (42) an outlet valve (52) are arranged, which can be controlled by a control device.
    [11]
    The device (36) according to claim 10, characterized in that the control device is adapted to close both the inlet valve (51) and the outlet valve (52) and to compress the liquid plastic component located in the buffer volume (40), and a sensor is provided by which an irregular reduction or compression of the buffer volume (40) can be detected.
    [12]
    12. Device (100) for producing foamed plastic parts, in particular sealing beads, with a device (36) according to at least one of claims 1 to 11. Innsbruck, 2 July 2015
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    引用文献:
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    法律状态:
    2021-06-15| PC| Change of the owner|Owner name: HENKEL AG & CO. KGAA, DE Effective date: 20210511 |
    优先权:
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