• 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:
    The mold cylinder comprises a chamber (1) inside which a rod (2) provided with a piston (3) at one of its ends is displaced by the action of a fluid, said cylinder further comprising at least one fluid inlet (4) that communicates with said chamber (1) through a connection duct (5), in which the or each fluid inlet (4) or the or each connection duct (5) comprises a flow regulator (10; 20) of said fluid. As in many cases the speeds of the existing cylinders are too fast for the molds, with the placement of flow regulators, their functionality is increased. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2754721A1
    申请号:ES201830997
    申请日:2018-10-16
    公开日:2020-04-20
    发明作者:Pruna Alberto Navarra
    申请人:Comercial de Utiles y Moldes SA；
    IPC主号:
    专利说明:

    [0001]
    [0002] Cylinder for molds
    [0003]
    [0004] The present invention relates to a cylinder for molds, in which the flow rate of the fluid is regulated.
    [0005]
    [0006] Background of the Invention
    [0007]
    [0008] All the mechanisms of the injection molds for industrial parts of a certain size have movements that are not usually too fast, but rather to the contrary, they are quiet movements, since they have to move parts with a certain weight, in addition to moving on roads well adjusted and with combinations in many cases that must harmonize with different components.
    [0009]
    [0010] To operate these movements, the application of hydraulic cylinders is the most suitable solution, since its energy source is obtained by connecting them in the injection machine circuit itself, which is already prepared for this purpose.
    [0011]
    [0012] All hydraulic cylinders already come with inlet holes suitable for their volume, but since each machine has its own hydraulic circuit, as well as different flow rates and pressures, their movements can have different speeds, which in many Cases requires that these cylinders have to incorporate a damping system, in order to avoid so-called hydraulic shocks.
    [0013]
    [0014] A large majority of molds do not require cylinders with large paths, since a 100 mm path can cover more than 95% of cases, and only in special cases these paths can be overcome, while in the vast majority we could define that a range of standard hydraulic movements would be within 50mm of travel.
    [0015]
    [0016] Since all the hydraulics are connected to a closed oil circuit, by activating the flow through the cylinder piston thrust inlet, the oil that filled the other part of the piston is being displaced to leave the cylinder, while when we activate the flow through the other inlet occurs exactly the same, but in reverse.
    [0017] That is, the same oil that enters through the pressure of the pump, on the one hand, makes the other cavity drain to allow movement in a closed circuit.
    [0018]
    [0019] Taking these data into consideration and starting from the basis that we are preferably talking about medium-large molds, the cycles exceed in most cases 30 seconds to close and open the mold. On very rare occasions, the speed of movements is crucial for obtaining the cycles and that a speed of hydraulic movements below 4 meters per minute does not require damping, or what is the same, below this speed, there is no risk of the so-called hydraulic shock.
    [0020]
    [0021] Based on this hypothesis, by reducing the flow rate in the cylinders, we can reduce their displacement speed, therefore eliminating the expensive damping system, thus unifying the overall dimensions of the cylinders.
    [0022]
    [0023] In none of the cases would these standard cylinders have a higher speed than the current models, but they could all down-regulate their travel speeds.
    [0024]
    [0025] The standardized block cylinders that are on the market are designed for infinite applications, so their manufacture is practically handmade, since each model contemplates many coupling and connection variants, as well as displacement modalities with front, rear damping, for both directions, etc., which prevents unifying general dimensions for the same routes, while for the specific sector of the molds, the unification of the dimensions in many cases is a primary issue, so a good functional design of the block cylinders for molds we can consider a very reasonable objective.
    [0026]
    [0027] Accordingly, the purpose of the present invention is to create a new concept of block cylinder for molds.
    [0028]
    [0029] As in many cases the speeds of the existing hydraulic cylinders are too fast for the molds, we consider that, with the placement of flow regulators, their functionality would be increased.
    [0030]
    [0031] Description of the Invention
    [0032] With the mold cylinder of the invention it is possible to solve the aforementioned drawbacks, presenting other advantages that will be described below.
    [0033]
    [0034] The cylinder for molds according to the present invention comprises a chamber inside which a rod provided with a piston at one of its ends is displaced by the action of a fluid, said cylinder further comprising at least one fluid inlet that communicates with said chamber through a connection conduit, and characterized in that the or each fluid inlet or the or each connection conduit comprises a flow regulator of said fluid.
    [0035]
    [0036] According to a first option, said flow regulator comprises a rod placed in said connection conduit, regulating the flow of the fluid as a function of the diameter of said rod. Furthermore, said flow regulator also comprises a threaded portion integral with the rod that is fixed in a cylinder connection hole.
    [0037]
    [0038] According to a second option, said flow regulator comprises a main shaft provided with:
    [0039] - a central hole;
    [0040] - a non-return valve arranged in said central hole;
    [0041] - a flow zone formed by a groove on the outside of the main shaft;
    [0042] - first through holes arranged in said flow zone communicating said flow zone with the central hole; and
    [0043] - second offset through holes of said flow zone;
    [0044] Said flow regulator further comprising an adjusting part provided with a flow zone, so that the position of said flow zone in relation to said second through holes will determine the flow rate of the fluid entering the cylinder.
    [0045]
    [0046] The mold cylinder according to the present invention may also comprise at least one steam trap and / or at least one refrigeration circuit.
    [0047]
    [0048] Brief description of the drawings
    [0049]
    [0050] For a better understanding of what has been stated, some drawings are attached in which, schematically and only by way of non-limiting example, a practical case of embodiment is represented.
    [0051] Fig. 1 is an elevation view of the rear of the mold cylinder according to the present invention, according to a first embodiment;
    [0052]
    [0053] Figure 2 is an elevation view of the lateral part of the cylinder for molds according to the present invention, according to said first embodiment;
    [0054]
    [0055] Figure 3 is a sectional view along line III indicated in Figure 1;
    [0056]
    [0057] Figure 4 is a sectional view along line IV indicated in Figure 1;
    [0058]
    [0059] Figure 5 is a sectional view along the line V indicated in Figure 1;
    [0060]
    [0061] Fig. 6 is a sectional view of the mold cylinder according to the present invention, according to a second embodiment;
    [0062]
    [0063] Fig. 7 is an elevation view of the rear of the mold cylinder according to the present invention, according to a third embodiment;
    [0064]
    [0065] Figure 8 is an elevation view of the lateral part of the cylinder for molds according to the present invention, according to said third embodiment;
    [0066]
    [0067] Figure 9 is a sectional view along line IX indicated in Figure 7;
    [0068]
    [0069] Figure 10 is a sectional view along line X indicated in Figure 7;
    [0070]
    [0071] Fig. 11 is an elevation view of the rear of the mold cylinder according to the present invention, according to a fourth embodiment;
    [0072]
    [0073] Figure 12 is a sectional view along line XII indicated in Figure 11;
    [0074]
    [0075] Figure 13 is a sectional view along the line XIII indicated in Figure 11;
    [0076]
    [0077] Figure 14 is a sectional view along line XIV indicated in Figure 11; and
    [0078]
    [0079] Fig. 15 is a sectional view of the flow regulator according to the second option (third and fourth cylinder embodiments);
    [0080] Figure 16 is a side elevational view of a mold cylinder according to the present invention provided with a bottom fixing; and
    [0081]
    [0082] Figure 17 is a plan view of a mold cylinder according to the present invention provided with sensors.
    [0083]
    [0084] Description of preferred embodiments
    [0085]
    [0086] As indicated above, in many cases the speeds of the existing cylinders are too fast for the molds, for this reason, with the placement of flow regulators, their functionality would be increased.
    [0087]
    [0088] Conventionally, mold cylinders, for example hydraulic cylinders, comprise a chamber 1 inside which a rod 2 provided with a piston 3 is displaced at one of its ends by the action of a fluid, said cylinder further comprising the minus a fluid inlet 4 that communicates with said chamber 1 through a connection duct 5.
    [0089]
    [0090] According to the first and second embodiments shown in Figures 1 to 6, a first option of the flow regulator 10 comprises a rod 11, the diameter of which can vary, inserted by means of a thread in a connection hole of the cylinder. A larger diameter of regulator rod 11 equates to less flow, and a lower travel speed. With this flow regulator 10 it is possible to reduce the speed in a pre-established way.
    [0091]
    [0092] Accurately regulating the speed in the cylinders brings a series of additional advantages, such as the ease of maneuvering different components interchangeably and achieving different speeds in the directions of travel.
    [0093]
    [0094] In accordance with another flow regulator option, generally indicated by reference number 20 and shown in the third and fourth embodiments shown in Figures 7 to 14, a flow regulator 20 is placed at each of inlets 4 of the cylinder, this regulator 20 acting as a tap, but conversely, that is, instead of "opening", it only allows "closing" the passage.
    [0095]
    [0096] This flow regulator 20 comprises a main shaft 21 to be coupled to the body of the cylinder, by means of a threaded area, comprising inside a non-return valve 22, which allows the passage of oil in one direction, blocking it in the opposite direction.
    [0097]
    [0098] This main shaft 21 incorporates machining from the outside, a groove to house a seal 23, then another wider groove that will serve as a flow area 24, within which first intersecting through holes 25 are machined. with a central hole 26 of the main shaft 21 itself.
    [0099]
    [0100] A few second through holes 27 are machined at a certain distance, but outside the flow zone 24, and finally it comprises another groove for a seal 28, and a threaded zone through which an adjusting part 29 is coupled.
    [0101]
    [0102] The adjusting part 29 has inside it, regardless of the threaded area, a flow area 24, as well as a quality surface finish, since it must slide on the main shaft seals 21 without damaging them. Its outer part is knurled to allow it to be manipulated by hand.
    [0103]
    [0104] These assembled components form a flow regulator 20, which, coupled to each of the cylinder 4 inlets, can be used as a tap, with which we can "shut off" the flow rate at will.
    [0105]
    [0106] When the oil enters through the flow regulator 20, the non-return valve 22 opens, allowing the cylinder chamber 1 to be filled without any type of impediment.
    [0107]
    [0108] When the oil wants to leave chamber 1, the non-return valve 22 blocks the exit and, therefore, the oil only has the option of escaping through the second holes 27 of the main shaft 21 of the regulator 20 machined outside the area of flow 24, but in order for the oil to flow freely, it is necessary that the first machined holes 25 in the flow zone 24 coincide, and for this only the flow zone 24 machined in the adjustment piece 29 is available.
    [0109]
    [0110] When the coincidence between the flow zone 24 and the holes 25, 27 is total, the oil outlet flow is 100%, but if we move through the adjusting part 29, the flow zone 24, it causes the connection between the two groups of holes 25, 27 are not connected and the oil passage is completely closed.
    [0111] Therefore, by reducing the flow of any of the inlets, we limit the flow of oil thus slowing down the travel speed.
    [0112]
    [0113] Introducing in the market a standardized product that can combine these advantages, with other current needs of the molds, such as refrigeration integrated circuits 6 (shown in Figures 5 and 14), with the pre-installation incorporated in all models for different systems of sensors or with a double purge system using steam traps 7 (shown in Figures 4, 6, 10 and 13), with channeled drainage, as well as a unified position system consisting of flanges 8 incorporated in the base of front screws 9 (shown in Figures 7, 9 and 10) to fix the cylinder in the mold, we find that we are bringing a significant technological advance to the sector.
    [0114]
    [0115] The cooling circuit 6 consists, for example, of three intersecting holes located at the bottom of the cylinder, U-shaped and with inlet and outlet located on the rear face of the cylinder. Recesses would be made on the underside in order to minimize the contact areas of the cylinder with the hot plate of the mold.
    [0116]
    [0117] The traps 7 are preferably located on one side, so that by means of an internal connection hole and by means of a connector placed on the rear face of the cylinder, a flexible tube can be connected to ecologically direct all the dirt given off by the purged.
    [0118]
    [0119] The fixing of the cylinder in the mold is positioned with the flanges 8 incorporated in the cylinder itself on the underside of the plate and coincident with the position of the two front fixing screws 9.
    [0120]
    [0121] As an alternative, a mold cylinder according to the present invention is shown in Figure 16 comprising anchor bushings 31 (the second anchor bush is capped on the foreground anchor bush) positioned at the bottom of said cylinder.
    [0122]
    [0123] However, it should be noted that the fixing of the cylinder according to the present invention can be carried out in any suitable way on the front or bottom face of the mold cylinder.
    [0124] In addition, an embodiment of the mold cylinder according to the present invention is shown in Figure 17, comprising sensors 32, which can be magnetic or mechanical sensors, located on the upper face of the cylinder.
    [0125]
    [0126] The operation of the mold cylinder according to the present invention is as follows.
    [0127]
    [0128] The cylinder is connected to the machine circuit through two connection hoses, one for the inlet or outlet for the movement of the piston towards the outside of the cylinder, while the other for the inlet or outlet for the movement of the piston towards the inside.
    [0129]
    [0130] As it is a closed circuit, to fill part of the chamber 1 of the cylinder, the other part must be emptied, and this is done with the pressure exerted by the hydraulic oil, the hydraulic pressure pushes the piston 3 that moves, causing it to come out the oil in the other part of chamber 1. The effect is the same by applying the inlet with the other connection hose. It should be noted, however, that the cylinder according to the present invention can be used without hoses, as shown in figure 6.
    [0131]
    [0132] As the oil volumes are different for each part of the cylinder, to push the outlet of the piston 3 we use the filling connection of the part that does not have a stem, while to push the return we push through the part that has a stem. Logically, the stem 2 inside the cylinder occupies a volume, which in this case is steel, so the amount of oil in this part of the cylinder is less than the other, with the same value as the volume of the stem 2. This gives us indicates that the amount of oil we need to push is greater than the amount we need to go back. In all cases the speeds between the input and output of the piston 3 are not exactly the same.
    [0133]
    [0134] A cylinder with open flow regulators has the same travel speeds as conventional cylinders, but by closing the flow regulator at the outlet connection, we find that the oil in this cavity requires more time to evacuate the amount of oil and acting in reverse we are exactly the same, although in both cases the emptying times are different, as they are different volumes to empty. In addition, the regulation system will also allow to equalize the speeds in both directions of movement of the stem.
    [0135] By turning the adjusting part 29 of the flow regulator 20 we are closing the oil outlet of the part of the chamber 1 that we must empty and, therefore, we automatically manage to slow down the advance of the piston 2. When we turn the adjusting part in the other direction, it happens exactly the same, but in reverse. This simple operation of opening or closing the regulator, based on a certain speed obtained, allows us to fine-tune the displacement speed in each of the directions of stem 2 indistinctly, thus adapting the hydraulic displacement speed to the needs of our mechanism.
    [0136]
    [0137] Although reference has been made to specific embodiments of the invention, it is evident to a person skilled in the art that the described mold cylinder is susceptible to numerous variations and modifications, and that all the mentioned details can be replaced by other technically equivalent ones. , without departing from the scope of protection defined by the appended claims.
    权利要求:
    Claims (6)
    [1]
    1. Cylinder for molds, comprising a chamber (1) inside which a rod (2) provided with a piston (3) is displaced at one of its ends by the action of a fluid, said cylinder further comprising at least one inlet of fluid (4) that communicates with said chamber (1) through a connection duct (5), characterized in that the or each fluid inlet (4) or the or each connection duct (5) comprises a regulator flow (10; 20) of said fluid.
    [2]
    2. Cylinder for molds according to claim 1, wherein said flow regulator (10) comprises a rod (11) placed in said connection duct (5), regulating the flow of the fluid depending on the diameter of said rod (eleven).
    [3]
    3. Mold cylinder according to claim 2, wherein said flow regulator (10) also comprises a threaded portion (12) integral with the rod (11) that is fixed in a cylinder connection hole.
    [4]
    4. Mold cylinder according to claim 1, wherein said flow regulator (20) comprises a main shaft (21) provided with:
    - a central hole (26);
    - a non-return valve (22) arranged in said central hole (26);
    - a flow zone (24) formed by a groove on the outside of the main shaft (21); - first through holes (25) arranged in said flow zone (24) that communicate said flow zone (24) with the central hole (26); and
    - second through holes (27) displaced from said flow zone (24); said flow regulator (20) further comprising an adjustment part (29) provided with said flow zone (24), so that the position of said flow zone (24) in relation to said second through holes (27) will determine the flow rate of the fluid entering the cylinder.
    [5]
    5. Mold cylinder according to claim 1, which also comprises at least one trap (7).
    [6]
    6. Mold cylinder according to claim 1, which also comprises at least one cooling circuit (6).
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    同族专利:
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US2636233A|1949-09-02|1953-04-28|Cuyahoga Ind|Molding machine|
    US3202060A|1963-12-30|1965-08-24|Pneumatic Hydraulic Dev Co Inc|Fluid power cylinder|
    EP3176482A1|2014-08-01|2017-06-07|Yugen Kaisha Hama International|Speed controller|
    CN105599176A|2016-03-01|2016-05-25|广东乐善机械有限公司|Quick high-pressure electrical-hydraulic mold-locking device|
    法律状态:
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    优先权:
    申请号 | 申请日 | 专利标题
    ES201830997A|ES2754721B2|2018-10-16|2018-10-16|Cylinder for molds|ES201830997A| ES2754721B2|2018-10-16|2018-10-16|Cylinder for molds|
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