A punching structure in a mold for soft rubber products

Abstract

The present invention discloses a punching structure in a mold for a soft rubber product, wherein a pair of first guide grooves are provided on the front mold core, a hook groove is provided in the first guide groove, a runner groove, a cavity and a second guide groove are provided on the rear mold core, and a mounting plate in the punching mechanism is slidably arranged in the inner cavity, and when the mold is closed, the guide rod passes through the second guide groove and extends into the first guide groove and the end is embedded in the hook groove, and the end of the punching ejector rod extends into the inner end of the runner groove, and when the mold is opened, the rear mold core is separated from the front mold core so that the punching ejector rod passes through and protrudes from the runner groove, and the guide rod is pushed by the push inclined surface to offset and detach from the hook groove and the first guide groove, and the product ejector module is used to eject the product from the cavity. The punching mechanism of the present invention realizes the relative movement of the gate material relative to the product position in the initial stage of mold opening, thereby disconnecting the gate material from the product by punching, realizing the punching and separation of the gate material in the mold, which can improve the mold opening efficiency, and the product is separated after the gate material, which can avoid defects in the product appearance and ensure product quality.

Description

Technical Field

[0001] The invention relates to the technical field of punching of soft rubber products, and in particular to a punching structure inside a mold of soft rubber products. Background Art

[0002] The processing and molding of soft rubber products can be achieved through injection molding. During the processing (injection molding) process, the molten material enters the gate and then enters the cavity to form the soft rubber product and the gate material. Finally, after demolding, the product and the gate material are separated to form the final product. However, in the general molding method of this product, the process of separating the product from the gate material is carried out after demolding, and it is impossible to achieve the punching and separation of the product and the gate material in the mold or during the demolding process. Therefore, a subsequent separation process will be added, resulting in low demolding efficiency.

[0003] In the prior art, such as the application number 202211524226.2, an efficient injection molding device and an injection molding process for automotive plastic accessories can realize the separation and molding of the product and the gate material by cutting when the product is demolded or during the demolding process. It specifically discloses a cleaning and pushing component, which includes components such as a rocker arm, a rotating rod, a fixed gear, a threaded rod, a sliding plate and a cutter head. When the mold is opened, the cleaning and pushing component will start to cut off the residual material at the injection port, so that the excess residual material on the model is automatically removed, and there is no need to manually remove the residual material again after the model is taken out. At the same time, the cleaning and pushing component pushes the model from the inside of the mold to assist in demolding. However, in the process of opening the mold, it requires a transmission process of a series of components such as a torsion spring, a fixed gear, a power transmission gear, a threaded rod, a sliding plate and a cutter head to achieve it. It is relatively complicated in structure and in the steps of cleaning the gate material and ejecting the product. Summary of the invention

[0004] The purpose of the present invention is to provide a punching structure inside a mold for a soft rubber product. The punching mechanism can realize the relative movement of the gate material relative to the product position in the initial stage of mold opening, thereby realizing the punching separation of the gate material from the product, realizing the punching separation of the gate material in the mold, and improving the efficiency of mold opening; and on the premise that the product is separated from the gate material after being formed, defects in the product's appearance can be avoided, thereby ensuring product quality.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a die-cutting structure for soft rubber products, comprising:

[0006] The front mold plate is provided with a front mold core, and the front mold core is symmetrically provided with a pair of first guide grooves in a straight line structure on both sides of the hot nozzle, and the side wall of the inner end of the first guide groove is provided with a hook groove.

[0007] A rear mold plate is provided with a rear mold core, the rear mold core is provided with a flow channel groove and a mold cavity connected to each other, and an inner cavity is provided between the rear mold core and the rear mold plate, a second guide groove is provided on the rear mold core at a position relative to the first guide groove, the second guide groove is connected to the inner cavity, and a push-off inclined surface is provided on one side of the second guide groove close to the first guide groove,

[0008] The punching mechanism comprises a mounting plate, and a pair of guide rods and a plurality of punching ejector rods arranged on the mounting plate. The mounting plate is slidably arranged in the inner cavity. The width of the guide rod is smaller than the width of the first guide groove and the second guide groove. When the mold is closed, the guide rod passes through the second guide groove and extends into the first guide groove and the end is embedded in the hook groove, and the end of the punching ejector rod extends into the rear mold core and the inner end of the runner groove. When the mold is opened, the rear mold core is separated from the front mold core so that the punching ejector rod passes through and protrudes from the runner groove for ejecting the gate material to separate it from the product in the cavity, and the guide rod is pushed by the push inclined surface to deviate from the hook groove and the first guide groove.

[0009] The product ejector module comprises an ejector plate and a plurality of ejectors arranged on the ejector plate. The ejectors can pass through the rear mold core and extend into the mold cavity to eject the product.

[0010] As a further optimization, the guide rod includes a long rod and a short rod arranged at the end of the long rod. The long rod is bent and has a force-bearing inclined surface. When the mold is closed or opened, the push inclined surface interacts with the force-bearing inclined surface to make the short rod embed into or disengage from the hook groove.

[0011] As a further optimization, the long rod includes a front section rod, an inner oblique rod and a rear section rod, the front section rod and the rear section rod are connected by the inner oblique rod, the force-bearing inclined surfaces are formed on the opposite side walls of the inner oblique rod, and the short rod is formed on the side wall of the front section rod away from the rear section rod.

[0012] As a further optimization, the length of the push slope is greater than the length of the force-bearing slope, so that the push slope can act on the entire length (area) of the force-bearing slope when opening or closing the mold, ensuring uniform force on the force-bearing slope and the guide rod.

[0013] As a further optimization, the hook groove is located on a side of the first guide groove close to the hot nozzle.

[0014] As a further optimization, a limiting block for limiting the end of the guide rod is also provided in the front mold core.

[0015] As a further optimization, the mounting plate includes a panel and a base plate arranged at one end of the panel, the panel is provided with a mounting groove that penetrates its body, and the panel is provided with a pair of limiting grooves connected to the mounting groove at one end close to the base plate, a pair of protrusions are symmetrically provided on opposite sides of the guide rod, the guide rod can be translatedly arranged in the mounting groove, and the pair of protrusions are respectively located in a pair of limiting grooves.

[0016] As a further optimization, the protrusion is a limiting column, and the end of the guide rod is in contact with the bottom plate.

[0017] As a further optimization, the convex portion is an extension plate, and a spherical positioning groove is provided at the end of the guide rod and the side of the extension plate away from the base plate, a rolling ball is provided in the spherical positioning groove, and a linear rolling groove is provided on the base plate and in the limit groove, and the rolling ball is movably arranged in the linear rolling groove, so that the jamming phenomenon that may occur in the guide rod during translation is reduced by rolling friction, so that the guide rod can be smoothly separated from or enter the hook groove, thereby realizing smooth mold opening or closing.

[0018] As a further optimization, a spring assembly is provided on the side of the mounting plate away from the punching ejector rod to assist the relative movement of the mounting plate.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The blanking mechanism can realize the relative movement of the gate material relative to the product position in the initial stage of mold opening, thereby realizing the blanking separation of the gate material from the product, realizing the blanking separation of the gate material in the mold, and improving the efficiency of mold opening;

[0021] 2. The punching mechanism can avoid defects in product appearance caused by the simultaneous ejection of the product and the gate material (especially for soft rubber products, the reverse stretching of the product when the gate material leaves the runner groove causes the ejector to exert a large ejection force on the product), which can ensure that the product has a good appearance and the injection molding quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional view of the present invention.

[0023] Figure 2 It is a structural diagram of the front mold core, the rear mold core and the punching mechanism of the present invention.

[0024] Figure 3 It is a structural diagram of the rear template, rear mold core and blanking mechanism of the present invention.

[0025] Figure 4 This is a structural diagram of the product of the present invention, in which the gate material is located in the rear mold core.

[0026] Figure 5 It is a structural diagram of the blanking mechanism of the present invention.

[0027] Figure 6 This is a bottom perspective structural diagram of the guide rod and panel in one embodiment of the blanking mechanism of the present invention.

[0028] Figure 7 It is an assembly diagram of another embodiment of the punching mechanism of the present invention.

[0029] Figure 8 for Figure 7 Enlarged view of point A in the middle.

[0030] Fig. 9 This is a bottom perspective structural diagram of a panel in another embodiment of the punching mechanism of the present invention.

[0031] Fig.10 This is a bottom perspective structural diagram of a limit block matching another embodiment of the punching mechanism of the present invention.

[0032] Fig.11 It is a schematic diagram of the front mold core and the rear mold core abutting against each other when the mold is closed according to the present invention.

[0033] Fig.12 It is a schematic diagram of the initial separation state of the front mold core and the rear mold core when the mold is opened according to the present invention.

[0034] Fig.13 It is a structural schematic diagram of the product and gate material of the present invention.

[0035] In the figure: 10. Front template,

[0036] 20. Front mold core, 21. Limit block, 22. Second rolling ball, 201. First guide groove, 202. Hook groove, 211. Limit slot, 231. End block, 232. Spacer block,

[0037] 30. Hot mouth,

[0038] 40. Rear template, 400. Inner cavity,

[0039] 50. rear mold core, 50a. gate groove, 50b. ejector groove, 500. cavity, 501. second guide groove, 502. push slope, 503. ejector hole, 5021. external support push surface, 5022. internal pressure push surface,

[0040] 60. Blanking mechanism, 61. Mounting plate, 62. Guide rod, 63. Punching ejector rod, 64. Spring, 610. Mounting groove, 611. Panel, 612. Bottom plate, 621. Long rod, 622. Short rod, 6101. Limiting groove, 6102. Second linear rolling groove, 6120. First linear rolling groove, 6211. Front section rod, 6212. Inner oblique rod, 6213. Rear section rod, 6230. Spherical positioning groove, 6231. Limiting column, 6232. Extension plate, 6233. First rolling ball,

[0041] 70. Product ejector pin module, 71. ejector plate, 72. ejector pin.

[0042] 100A. Product, 100B. Gate material; 100B′ auxiliary material. DETAILED DESCRIPTION

[0043] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0044] like Figures 1 to 5 , combined Fig.13As shown, a punching structure in a mold for a soft rubber product is used for processing and molding a product 100A. When injection molding is performed in the mold, a connection structure of a gate material 100B and a product 100A is formed in a gate groove 50a and a cavity 500, and the two are structures connected by soft rubber materials. The punching structure in a mold for a soft rubber product of the present invention specifically includes a front template 10, a front mold core 20, a rear template 40, a rear mold core 50, a punching mechanism 60 and a product ejector module 70. The front template 10 is provided with a front mold core 20, and a pair of first guide grooves 201 in a straight structure are symmetrically provided on both sides of a hot nozzle 30 on the front mold core 20, and a hook groove 202 is provided on the side wall of the inner end of the first guide groove 201, and a rear mold core 50 is provided on the rear template 40. The rear mold core 50 is provided with a runner groove and a cavity 500, the runner groove includes a gate groove 50a, and an ejector groove 50b connected to the gate groove 50a and penetrating the rear mold core 50, an inner cavity 400 is provided between the rear mold core 50 and the rear mold plate 40, a second guide groove 501 is provided on the rear mold core 50 at a position relative to the first guide groove 201, the second guide groove 501 is connected to the inner cavity 400, and a side of the second guide groove 501 close to the first guide groove 201 is provided with a push inclined surface 502, the blanking mechanism 60 includes a mounting plate 61, and a pair of guide rods 62 and a plurality of punching ejector rods 63 arranged on the mounting plate 61, the mounting plate 61 is slidably arranged in the inner cavity 400, and the width of the guide rod 62 is smaller than the first guide groove 201 and The width of the second guide groove 501 is such that when the front mold core 20 and the rear mold core 50 are molded together, the guide rod 62 passes through the second guide groove 501 and extends into the first guide groove 201 and the end thereof is embedded in the hook groove 202, and the end of the ejector pin 63 extends into the inner end of the runner groove, that is, into the ejector groove 50b. When the front mold core 20 and the rear mold core 50 are opened, the rear mold core 50 is separated from the front mold core 20 so that the ejector pin 63 passes through and protrudes out of the runner groove (that is, extends out of the gate groove 50a) to eject the gate material 100B and separate it from the product 100A in the cavity 500. That is, at the beginning of the mold opening, the ejector pin 63 is temporarily fixed relative to the front mold core 20, and the rear mold core 50 and the product 100A in the cavity 500 are relatively far away from each other. The ejector pin 63 is now punched out to position and cut the gate material 100B, and the punching of the gate material 100B by the ejector pin 63 is completed. At the same time, the guide rod 62 is pushed by the push inclined surface 502 to produce a lateral offset and then disengages from the hook groove 202. As the front mold core 20 and the rear mold core 50 are further separated, the ejector pin 70 is disengaged from the first guide groove 201 to complete the mold opening. The product ejector pin module 70 includes an ejector plate 71 and a plurality of ejector pins 72 arranged on the ejector plate 71. When the mold is closed, the ejector pin 72 is located in the ejector pin hole 503 to seal the cavity 500. When the mold is opened (after the front mold core 20 and the rear mold core 50 are separated), the ejector pin 72 is driven by the ejector plate 71 to pass through the ejector pin hole 503 and extend into the cavity 500 to eject the product 100A.

[0045] Combination Figures 11 to 13As shown, after the front mold plate 10 and the rear mold plate 40 drive the front mold core 20 and the rear mold core 50 to close the mold respectively, the front mold core 20 abuts against the rear mold core 50, and the guide rod 62 passes through the second guide groove 501 and its upper part extends into the first guide groove 201, and its end is embedded in the hook groove 202, and the ejector rod 63 is punched and extends into the ejector groove 50b, and the ejector 72 extends into the ejector hole 503 to block the cavity 500, and the molten material is injected into the gate groove 50a through the hot nozzle 30, and after entering the cavity 500, the gate material 100B and the product 10 are formed respectively. 0A; when the mold is opened after the injection molding is completed, the rear mold plate 40, the rear mold core 50 and the product ejector module 70 are synchronously away from the front mold plate 10 and the front mold core 20, and the product 100A and the gate material 100B are respectively located in the mold cavity 500 and the gate groove 50a and have a tendency to move away from the front mold core 20. However, in the initial stage of mold opening, since the end of the guide rod 62 is still embedded in the hook groove 202, the relative positions of the guide rod 62, the mounting plate 61 and the punching ejector 63 and the front mold core 20 remain unchanged, and the punching ejector 63 extends into the gate groove 50 As the rear mold core 50 moves, the punching ejector pin 63 moves relative to the ejector pin slot 50b (i.e., relative to the rear mold core 50) and extends into the gate slot 50a to eject the gate material 100B out of the gate slot 50a to separate it from the product 100A, i.e., the gate material 100B is ejected first when the mold is opened; as the rear mold core 50 continues to move away from the front mold core 20, a side wall (outer support push surface 5021) of the push inclined surface 502 at the end of the second guide slot 501 abuts against the guide rod 62 and pushes the guide rod 62 to produce After the end portion is disengaged from the hook groove 202 by translation or rotation, it is not restricted in position. Therefore, the guide rod 62 can be disengaged from the first guide groove 201 and disengage from the front mold core 20 as the rear mold core 50 continues to move, so that the rear mold core 50 and the front mold core 20 can be completely separated. Then, by driving the ejector plate 71 to drive the ejector pin 72 to extend upward out of the ejector pin hole 503, the product 100A can be ejected out of the cavity 500 to complete the blanking of the product 100A. In the above, the blanking of the injection molded product is achieved by first ejecting the gate material 100B and then ejecting the product 100A. In the present invention, first, the position of the gate material 100B is fixed by fixing the blanking mechanism 60 relative to the front mold core 20 at the initial stage of mold opening, and because the rear mold core 50, the cavity 500 located on the rear mold core 50, and the product 100A located in the cavity 500 are relatively far away from the front mold core 20, the gate material 100B is relatively moved relative to the position of the product 100A, thereby achieving the blanking disconnection of the gate material 100B from the product 100A, and achieving the blanking of the gate material in the mold. Fig.13 The structure of the product 100A and the gate material 100B shown in the figure, the specific process of the separation and disconnection of the two is: during the process of the dislocation movement of the product 100A and the gate material 100B, the relative movement trajectory of the two is moving in the opposite direction, according to Fig.13From the perspective of the mold opening action, in the initial stage of mold opening, the gate material 100B keeps its position unchanged, and the product 100A is located in the cavity 500 and moves downward relatively. Since the gate material 100B is connected to the lower end of the product 100A through the auxiliary material 100B′ located at the lower end of its main body, in the process of the rear mold core 50 moving away from the front mold core 20, the end of the auxiliary material 100B′ connected to the product 100A continuously moves to the side away from the front mold core 20, so that the connection end is continuously stretched. Since it is soft rubber, the connection end of the auxiliary material 100B′ forms a shear at the junction with the product 100A after being stretched to a certain extent, and breaks, thereby completing the separation of the product 100A and the gate material 100B; secondly, with the help of the stretching effect of the auxiliary material 100B′ before breaking, and because it is connected to the product 10 0A, the bottom of the product 100A can be positioned stably and securely in the mold cavity 500 by stretching force, and the cutting and separation of the product 100A and the gate material 100B can be completed more smoothly. The above process can avoid the damage caused by the ejector 72 exerting a large force on the connection position between the product 100A and the gate material 100B due to different ejection degrees when the product 100A and the gate material 100B are ejected at the same time (such as the product 100A is ejected before the gate material 100B), or only ejecting the product 100A by the ejector 72 while driving the gate material 100B to separate from the gate groove 50a. The above-mentioned method of blanking the gate material 100B and the product 100A in the mold can ensure that the above-mentioned position of the product 100A has a good appearance, thereby ensuring the injection molding quality of the product 100A.

[0046] After the mold is opened and the product 100A is ejected, the product ejector module 70 is first reset relative to the rear template 40 and the rear mold core 50. Since the guide rod 62 is abutted by one side wall (the outer support pushing surface 5021) of the pushing inclined surface 502 to maintain the state when the mold is opened, during the process of the rear template 40 and the rear mold core 50 docking with the front template 10 and the front mold core 20 respectively, the guide rod 62 can be driven to extend into the first guide groove 201 and move in the first guide groove 201, and after extending into the first guide groove 201 for a certain distance, the other side wall (the inner pressure pushing surface 5022) of the pushing inclined surface 502 abuts against the guide rod 62, so that the guide rod 62 is translated or rotated to embed its end into the hook groove 202, thereby completing the mold closing action. In addition, in order to ensure that the guide rod 62 can move smoothly in the second guide groove 501 and the first guide groove 201 during the mold closing process of the rear mold core 50 and the front mold core 20 so that the other side wall of the push slope 502 (internal pressure push surface 5022) can abut against the guide rod, a spring assembly is provided on the side of the mounting plate 61 away from the punching push rod 63, and the two ends of multiple springs 64 abut on the mounting plate 61 and the inner wall of the inner cavity 400 respectively, that is, during the mold closing process, the guide rod 62 first extends into the first guide groove 201 due to the elastic support of the spring 64 and the end is located beside the hook groove 202, and then, during the abutment process of the rear mold core 50 and the front mold core 20, the end of the guide rod 62 is embedded in the hook groove 202 due to the abutment and pushing action of the other side wall of the push slope 502 (internal pressure push surface 5022). It should be further explained that when the spring assembly is present, during the initial stage of mold opening, when the rear template 40 and the front template 10 are separated, the mounting plate 61 will be supported by the spring 64 whose compression amount is released. Therefore, the guide rod 62 can be supported to ensure its stability. When the rear mold core 50 and the front mold core 20 are completely separated, the position of the mounting plate 61 and the guide rod 62 can also be ensured by the support and limitation of the spring assembly and the inner cavity 400, which is beneficial for the guide rod 62 to be able to extend into the first guide groove 201 more stably and accurately in the next step of mold closing.

[0047] In the present invention, the position of the rear mold core 50 relative to the front mold core 20 can be changed by the translation of the guide rod 62 and its movement in the first guide groove 201 and the second guide groove 501, which can conveniently assist in opening or closing the mold, thereby facilitating the separation and disengagement of the product 100A and the gate material 100B, and the matching mounting plate 61 and inner cavity 400 and other structures can realize the precise movement of each component, and the overall structure is relatively simple and efficient.

[0048] Preferably, the guide rod 62 includes a long rod 621 and a short rod 622 integrally formed at the end of the long rod 621. The long rod 621 is bent and has a force-bearing inclined surface. The length of the push inclined surface 502 is greater than the length of the force-bearing inclined surface. When the mold is closed or opened, the push inclined surface 502 acts on the force-bearing inclined surface to make the long rod 621 translate or rotate to drive the short rod 622 to embed into or disengage from the hook groove 202. The bent long rod 621 can more easily form a contact with the push inclined surface. The force-bearing inclined surface that acts on the push inclined surface 502; more specifically, for the formation of the force-bearing inclined surface, the long rod 621 includes a front section rod 6211, an inner inclined rod 6212 and a rear section rod 6213, the front section rod 6211 and the rear section rod 6213 are connected by the inner inclined rod 6212, and the force-bearing inclined surfaces are formed on the opposite side walls of the inner inclined rod 6212, and the short rod 622 is formed on the side wall of the front section rod 6211 away from the rear section rod 6213. Based on the above arrangement When the mold is opened, the outer support push surface 5021 of the rear mold core 50 gradually moves toward the inner oblique rod 6212 in the process of moving away from the front mold core 20, and the short rod 622 at the end of the guide rod 62 is separated from the hook groove 202 by the abutment with the inner oblique rod 6212. When the mold is closed, due to the support of the elastic component, the short rod 622 at the end of the guide rod 62 extends into the end of the first guide groove 201 before the rear mold core 50 abuts against the front mold core 20. 50 gradually moves toward the front mold core 20, and the internal pressure push surface 5022 gradually moves toward the direction of the inner inclined rod 6212, and the short rod 622 at the end of the guide rod 62 is embedded in the hook groove 202 through the abutment with the inner inclined rod 6212. The setting of the inner inclined rod 6212 facilitates the interaction with the push inclined surface 502 (the external support push surface 5021 and the internal pressure push surface 5022) at the end of the second guide groove 501 to realize the translation or rotation of the guide rod 62.

[0049] Under the premise that the guide rod 62 is moved between the above-mentioned push inclined surface 502 and the force inclined surface by using external support and internal pressure, the hook groove 202 is located on the side of the first guide groove 201 close to the hot nozzle 30, which is convenient for the short rod 622 to be separated or embedded.

[0050] In addition, a limiting block 21 for limiting the end of the guide rod 62 is provided in the front mold core 20 to ensure that the short rod 622 is precisely positioned and can be accurately embedded in the hook groove 202.

[0051] The position and movement of the guide rod 62 are the key to whether the short rod 622 can be embedded in the hook groove 202 and whether the long rod 621 can interact with the push inclined surface 502. Based on the compactness of the internal space of the mold (including the movable space), the present invention preferably uses translation rather than rotation to achieve movement of the guide rod 62. Figure 5 and Figure 6As shown, in one embodiment of the present invention, the mounting plate 61 includes a panel 611 and a bottom plate 612 arranged at one end of the panel 611, the panel 611 is provided with a mounting groove 610 penetrating the body thereof, and the panel 611 is provided with a pair of limiting grooves 6101 connected to the mounting groove 610 at one end close to the bottom plate 612, the guide rod 62 (i.e., the rear section rod 6213) is symmetrically provided with a pair of convex portions on opposite sides, the convex portions in this embodiment are limiting columns 6231, and the guide rod 62 (i.e., the rear section rod 6213) is arranged to be movably disposed at The guide rod 62 is in the installation groove 610, and its end is in contact with the bottom plate 612. A pair of limiting columns 6231 are respectively located in a pair of limiting grooves 6101, and are in contact with the side wall of the limiting groove 6101 away from the bottom plate 612. The limiting groove 6101 limits the limiting columns 6231 by downward pressure, and the bottom plate 612 limits the rear section rod 6213 by supporting. The guide rod 62 can be translated in the installation groove 610, thereby achieving the translation of the guide rod 62 when it is acted upon by the push inclined surface 502, so as to enable the short rod 622 to be embedded in or out of the hook groove 202.

[0052] like Figures 7 to 9 As shown, in another embodiment of the present invention, unlike the above-mentioned embodiment in which the guide rod 62 directly abuts against the bottom plate 612 and the limiting column 6231 (convex portion) abuts against the limiting groove 6101, a rolling translation method is provided in this embodiment, specifically: the convex portion is an extension plate 6232, and the end of the guide rod 62 (i.e., the rear section rod 6213) and the side of the extension plate 6232 away from the bottom plate 612 are provided with a spherical positioning groove 6230, a first rolling ball 6233 is provided in the spherical positioning groove 6230, a first linear rolling groove 6120 for embedding the first rolling ball located on the rear section rod 6213, and the limiting column 6231 (convex portion) is provided on the panel 611. A second linear rolling groove 6102 is provided in the groove 6101 for embedding the first rolling ball located on the extension plate 6232. Through the above-mentioned structural setting, the translation of the guide rod 62 in this embodiment is realized by the first rolling ball 6233, that is, the guide rod 62 does not abut against the base plate 612, and the extension plate 6232 does not abut against the limiting groove 6101. Therefore, the guide rod 62 can be moved more smoothly without causing translation jamming due to mutual friction that may occur during the movement, which is similar to the case where the guide rod 62 directly abuts against the base plate 612 (surface abutment) and the limiting column 6231 abuts against the limiting groove 6101 (surface abutment or line abutment).

[0053] Since the extension plate 6232 has a spherical positioning groove 6230, and the panel 611 and the bottom plate 612 have linear rolling grooves respectively, the first rolling ball 6233 can be respectively embedded in the spherical positioning groove 6230 and the linear rolling groove, and then the panel 611 and the bottom plate 612 can be locked by bolts to ensure that the first rolling ball 6233 will not be separated from the spherical positioning groove 6230 and the linear rolling groove, thereby realizing the translation of the extension plate 6232 relative to the mounting plate 61 and the smooth translation of the guide rod 62 relative to the mounting plate 61, and the phenomenon of warping at the left and right ends in the vertical direction will not occur.

[0054] Furthermore, combined Fig.10 As shown, on the basis of the limit block 21, in order to avoid the jamming phenomenon that may occur during the sliding process of the guide rod 62 directly contacting the limit block 21, a pair of limit slots 211 are set on the side of the limit block 21 close to the guide rod 62. The cross-section of the limit slot 211 is a circular structure larger than a semicircle, so the second rolling ball 22 can be placed in the limit slot 211, and the second rolling ball 22 can be rolled and limited therein without leaving the limit slot 211, and the limit slot is blocked by the end block 231. The end of the groove 211 is open, and a pair of second rolling balls 22 in a limiting groove 211 are separated by a spacing block 232 placed in the limiting groove 211 (the end-sealing block 231 and the spacing block 232 can be fixed on the inner wall of the limiting groove 211 by gluing), so that each second rolling ball 22 is limited to rolling and moving within a certain length, so that the guide rod 62 can always keep in contact with each second rolling ball 22 within its translation range, ensuring the smooth movement of the end of the guide rod 62. Therefore, the above-mentioned setting can make both ends of the guide rod 62 more smoothly translate without jamming, and on this basis, the rear mold core 50 and the front mold core 20 can be smoothly opened, and jamming during mold opening can be avoided, so that the product 100A can be smoothly unloaded.

[0055] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A punching structure in a mold for a soft rubber product, characterized in that: include: The front mold plate is provided with a front mold core, and the front mold core is symmetrically provided with a pair of first guide grooves in a straight line structure on both sides of the hot nozzle, and the side wall of the inner end of the first guide groove is provided with a hook groove. A rear mold plate is provided with a rear mold core, the rear mold core is provided with a flow channel groove and a mold cavity connected to each other, and an inner cavity is provided between the rear mold core and the rear mold plate, a second guide groove is provided on the rear mold core at a position relative to the first guide groove, the second guide groove is connected to the inner cavity, and a push-off inclined surface is provided on one side of the second guide groove close to the first guide groove, The punching mechanism comprises a mounting plate, and a pair of guide rods and a plurality of punching ejector rods arranged on the mounting plate. The mounting plate is slidably arranged in the inner cavity. The width of the guide rod is smaller than the width of the first guide groove and the second guide groove. When the mold is closed, the guide rod passes through the second guide groove and extends into the first guide groove and the end is embedded in the hook groove, and the end of the punching ejector rod extends into the rear mold core and the inner end of the runner groove. When the mold is opened, the rear mold core is separated from the front mold core so that the punching ejector rod passes through and protrudes from the runner groove for ejecting the gate material to separate it from the product in the cavity, and the guide rod is pushed by the push inclined surface to deviate from the hook groove and the first guide groove. A product ejector module, comprising an ejector plate and a plurality of ejectors arranged on the ejector plate, wherein the ejectors can pass through the rear mold core and extend into the mold cavity to eject the product; Wherein, the guide rod includes a long rod and a short rod arranged at the end of the long rod, the long rod is arranged in a bent shape and has a force-bearing inclined surface, when the mold is closed or opened, the push inclined surface acts on the force-bearing inclined surface to make the short rod embed into or disengage from the hook groove; the long rod includes a front section rod, an inner oblique rod and a rear section rod, the front section rod and the rear section rod are connected by the inner oblique rod, the force-bearing inclined surfaces are formed on the opposite side walls of the inner oblique rod, and the short rod is formed on the side wall of the front section rod away from the rear section rod.

2. The punching structure in the mold of soft rubber products according to claim 1, characterized in that: The length of the push inclined surface is greater than the length of the force-bearing inclined surface.

3. The punching structure in the mold of soft rubber products according to claim 2, characterized in that: The hook groove is located on one side of the first guide groove close to the hot nozzle.

4. The punching structure in the mold of soft rubber products according to claim 1, characterized in that: A limiting block for limiting the end of the guide rod is also provided in the front mold core.

5. The punching structure in the mold of soft rubber products according to claim 1, characterized in that: The mounting plate includes a panel and a bottom plate arranged at one end of the panel, the panel is provided with a mounting groove penetrating its body, and the panel is provided with a pair of limiting grooves connected to the mounting groove at one end close to the bottom plate, a pair of convex portions are symmetrically provided on opposite sides of the guide rod, the guide rod can be translatedly arranged in the mounting groove, and the pair of convex portions are respectively located in a pair of limiting grooves.

6. The punching structure in the mold of soft rubber products according to claim 5, characterized in that: The protrusion is a limiting column, and the end of the guide rod is in contact with the bottom plate.

7. The punching structure in the mold of soft rubber products according to claim 5, characterized in that: The convex portion is an extension plate, and a spherical positioning groove is provided at the end of the guide rod and on the side of the extension plate away from the base plate, a rolling ball is provided in the spherical positioning groove, and a linear rolling groove is provided on the base plate and in the limiting groove, and the rolling ball is movably arranged in the linear rolling groove.

8. The punching structure in the mold of soft rubber products according to claim 1, characterized in that: A spring assembly is provided on a side of the mounting plate away from the punching ejector rod.

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