Hollow bright bar mold gating system and injection mold

Abstract

The present application provides a gating system for a hollow bright bar mold and an injection mold. The gating system for the hollow bright bar mold includes a rear mold core and a lifter. The rear mold core is provided with a first cavity, and a punch is arranged in the first cavity. A groove is formed in the side surface of the lifter. The lifter and the rear mold core are slidably matched along a preset direction, so that the lifter has a first position and a second position which can be switched with each other. When the lifter is in the first position, the lifter is embedded in the rear mold core, and the two together define a communicating main runner and two sub-runners at the groove. The gates of the two sub-runners are both communicated with the first cavity, and the gates of the two sub-runners are respectively located on both sides of the punch for forming a strip-shaped through hole. When in the second position, the lifter disengages from the rear mold core and can be separated from the runner material. Wherein, the preset direction has an included angle with the mold opening and closing direction. The structure is simple, the cost is low, and the injection molding quality is high.

Description

Technical Field

[0001] The invention relates to the field of mold processing and manufacturing, and in particular to a hollow bright strip mold glue feeding system and an injection mold. Background Art

[0002] The injection molding machine injects hot, molten plastic into the mold cavity through a hot nozzle. The plastic first passes through a runner section before entering the product cavity through the gate. The gate connects the hot nozzle to the cavity. When the product is ejected and injection molding is complete, the gate connects the runner to the product, leaving a redundant mark on the surface. To obtain a fully finished product, the runner must be severed at the gate through processing methods, leaving a noticeable mark on the product surface. The bright strip is a decorative component on the bumper. Traditionally, its surface structure was simple, so single-sided injection was sufficient. Existing bright strips have a hollow center. If this single-sided injection method were used, the material would not easily fill the mold cavity, resulting in poor molding quality. Using two hot nozzle runners on either side of the bright strip would complicate the injection process and increase costs. Summary of the Invention

[0003] The object of the present invention is to provide a hollow bright strip mold glue feeding system and an injection mold, which can reduce the mold cost while meeting the molding quality.

[0004] The embodiment of the present invention is achieved as follows:

[0005] In a first aspect, the present invention provides a hollow bright strip mold glue feeding system, wherein the hollow bright strip has a strip-shaped through hole, comprising:

[0006] A rear mold core is provided with a first mold cavity;

[0007] and an inclined ejector block with a groove on the side, the inclined ejector block and the rear mold core are slidably matched along a preset direction, so that the inclined ejector block has a first position and a second position that can be switched with each other. When in the first position, the inclined ejector block is embedded in the rear mold core and the two together define a connected main runner and two branch runners at the groove. The gates of the two branch runners are both connected to the first cavity, and the gates of the two branch runners are respectively located on both sides of the male mold for forming the strip-shaped through hole; when in the second position, the inclined ejector block is separated from the rear mold core and can be separated from the runner material;

[0008] The preset direction and the mold opening and closing direction have an included angle.

[0009] In an optional embodiment, the cross-sectional area of the branch channel gradually decreases from one end close to the main channel to the other end.

[0010] In an optional embodiment, the cross-sectional profile of the branch channel is circular or elliptical.

[0011] In an alternative embodiment, the outer contour of the cross-section of the sprue is arc-shaped.

[0012] In an alternative embodiment, the gating system of the hollow bright bar mold further includes a hot nozzle, and the hot nozzle is communicated with the sprue.

[0013] In an alternative embodiment, the number of lifters is multiple, and the multiple lifters are arranged at intervals in the extending direction of the first cavity.

[0014] In an alternative embodiment, the lifter has a first mating surface and a second mating surface connected to each other. The first mating surface is used to fit with the cavity wall of the first cavity, and the second mating surface is used to fit with the front mold core; the groove includes a first groove section, a second groove section and two third groove sections. The first groove section is communicated with the second groove section and there is an included angle between their extending directions. One end of the first groove section far from the second groove section extends to the second mating surface; one ends of the two third groove sections are both communicated with the second groove section, and the other ends of the two third groove sections both extend to the second mating surface;

[0015] The first groove section and the second groove section are used to form the sprue, and the two third groove sections are used to form two sub-gates.

[0016] In a second aspect, the present invention provides an injection mold for molding a hollow bright bar. The injection mold includes:

[0017] A front mold core and the gating system of the hollow bright bar mold according to any one of the foregoing embodiments. The front mold core is provided with a second cavity, and the front mold core is used to cooperate with the rear mold core so that the first cavity and the second cavity cooperate to form the inner cavity for molding the hollow bright bar.

[0018] In an alternative embodiment, the injection mold further includes a driving mechanism, and the driving mechanism is connected to the lifter and is used to drive the lifter to reciprocally slide relative to the rear mold core in a preset direction.

[0019] In an alternative embodiment, the rear mold core is provided with a guiding through hole extending in the preset direction; the driving mechanism includes a thimble plate, a lifter seat and a connecting rod. The lifter seat is connected to the thimble plate, and the lifter seat is provided with a sliding groove; the connecting rod is disposed through the guiding through hole, one end of the connecting rod is slidably matched with the sliding groove, and the other end of the connecting rod is connected to the lifter.

[0020] The beneficial effects of the embodiments of the present invention are:

[0021] In summary, this embodiment provides a gating system for a hollow bright bar mold. During pouring, the lifter block is in the first position, and the groove on the lifter block cooperates with the rear mold core to form a main runner and two sub-runners that are both connected to the main runner. The ends of the two sub-runners away from the main runner are gates. The gates are located on the inner surface of the hollow bright bar, and the positions of the gates are concealed. After the hollow bright bar is assembled to the vehicle frame, the gate positions are not easily observable and do not easily affect the aesthetics of the hollow bright bar. At the same time, after the main runner is branched into two sub-runners, one hot nozzle is used to connect to the main runner, with a simple structure and low cost. At the same time, the lifter block and the rear mold core cooperate to form the runner, with a simple structure and being easy to process and manufacture. When the pouring is completed and the lifter block ejects the product, the runner material can automatically separate from the lifter block, facilitating the demolding of the product and also facilitating the subsequent treatment of the runner material, reducing the treatment difficulty and improving the operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0023] Figure 1 Structural schematic diagram of the hollow bright bar of the embodiment of the present invention (cooperating with the hollow bright bar);

[0024] Figure 2 Structural schematic diagram of the gating system of the hollow bright bar mold of the embodiment of the present invention;

[0025] Figure 3 Structural schematic diagram of the rear mold core of the embodiment of the present invention;

[0026] Figure 4 Structural schematic diagram of the rear mold core and the hollow bright bar of the embodiment of the present invention;

[0027] Figure 5 For Figure 4 Partial enlarged structural schematic diagram at position A in

[0028] Figure 6 Structural schematic diagram of the lifter block and the runner material of the embodiment of the present invention;

[0029] Figure 7 Structural schematic diagram of the separation of the lifter block and the runner material of the embodiment of the present invention.

[0030] Reference Signs:

[0031] 001 - Hollow bright bar; 101 - Strip-shaped through hole; 102 - Outer surface; 103 - Inner surface; 002 - Runner material; 100 - Rear mold core; 110 - First cavity; 120 - Assembly groove; 200 - Lifter block; 210 - First mating surface; 220 - Second mating surface; 230 - Groove; 231 - First groove section; 232 - Second groove section; 233 - Third groove section; 234 - Gate; 300 - Punch; 400 - Wear-resistant sleeve; 500 - Spliced convex strip; 600 - Driving mechanism; 610 - Lifter base; 611 - Slide groove; 620 - Connecting rod. Detailed implementation mode

[0032] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Usually, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0035] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the present invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0036] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0037] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "arrangement", "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Currently, when injection molding a hollow bright strip, it is necessary to arrange gate 234 on both sides of the bright strip, and each gate 234 needs to correspond to a hot nozzle system. In this way, the mold cost is greatly increased, and the mold manufacturing efficiency is reduced.

[0039] Please refer to Figures 2 - 7 , in view of this, the designer designed a gate feeding system for a hollow bright strip 001 mold, which can reduce the mold cost on the premise of meeting the molding quality.

[0040] Please refer to Figure 1 , it should be noted that the hollow bright strip 001 is strip-shaped, and the hollow bright strip 001 is provided with a strip-shaped through hole 101, and the through hole extends along the length direction of the hollow bright strip 001. The hollow bright strip 001 has opposite outer surfaces 102 and inner surfaces 103. When the hollow bright strip 001 is used as an automotive decoration and is arranged on the vehicle frame, the outer surface 102 is exposed for appearance display. The inner surface 103 is attached to the vehicle frame and hidden, and is not easily observable. Therefore, when injection molding the hollow bright strip 001, the gate 234 is arranged on the inner surface 103 of the hollow bright strip 001.

[0041] Please refer to Figures 2 - 5 , in this embodiment, the gate feeding system of the hollow bright strip 001 mold includes a rear mold core 100 and a lifter block 200. The rear mold core 100 is provided with a first cavity 110, and a punch 300 is arranged in the first cavity 110. A groove 230 is formed on the side surface of the lifter block 200. The lifter block 200 and the rear mold core 100 are slidably matched along a preset direction, so that the lifter block 200 has a first position and a second position that can be switched with each other. When the lifter block 200 is in the first position, the lifter block 200 is embedded in the rear mold core 100, and the two jointly define a connected main runner and two sub-runners at the groove 230. The gates 234 of the two sub-runners are both communicated with the first cavity 110, and the gates 234 of the two sub-runners are respectively located on both sides of the punch 300 for forming the strip-shaped through hole 101; when in the second position, the lifter block 200 is separated from the rear mold core 100 and can be separated from the runner material 002. Among them, the preset direction has an included angle with the mold opening and closing direction.

[0042] It should be understood that the hollow bright bar 001 mold provided in this embodiment is a vertical mold, with the glue injection being from the top of the mold, and the mold opening and closing direction being the vertical direction. After the injection molding is completed, the mold opens, and the lifter 200 slides along a preset direction under the action of an external force. After the lifter 200 ejects the hollow bright bar 001 from the first cavity 110, the lifter 200 can also be separated from the runner material 002. In other words, the movement of the lifter 200 along the preset direction is a compound movement, which can be decomposed into a movement in the vertical direction and a movement in the horizontal direction. The movement of the lifter 200 in the vertical direction lifts the hollow bright bar 001, and the movement of the lifter 200 in the horizontal direction separates the remaining runner material 002, which is beneficial for demolding. Unless otherwise specified, the vertical direction is the direction indicated by the ab arrow in the figure, the horizontal direction is the direction indicated by the cd arrow in the figure; the preset direction is the direction indicated by the ef arrow. And the preset direction has non-zero angles with both the vertical direction and the horizontal direction, and the angle range is not specifically limited in this embodiment.

[0043] For the glue injection system of the hollow bright bar 001 mold provided in this embodiment, during pouring, the lifter 200 is in the first position, and the groove 230 on the lifter 200 cooperates with the rear mold core 100 to form a main runner and two sub-runners both communicating with the main runner. The ends of the two sub-runners away from the main runner are gate 234. The gate 234 is located on the inner surface 103 of the hollow bright bar 001, and the position of the gate 234 is concealed. After the hollow bright bar 001 is assembled to the vehicle frame, the position of the gate 234 is not easily observable, which does not easily affect the aesthetics of the hollow bright bar 001. At the same time, after the main runner is branched into two sub-runners, one hot runner is connected to the main runner, and the raw material is respectively transported to the two sub-runners through the main runner, and injection molding is carried out from both sides at the same time, which not only meets the injection molding quality, but also the glue injection system saves the hot runner mechanism, and the glue injection system has a simple structure and low cost.

[0044] At the same time, the groove 230 provided on the lifter 200 can cooperate with the rear mold core 100 to form a runner, so that the runner does not need to be directly set on the rear mold core 100, reducing the processing difficulty of the rear mold core 100 and facilitating processing and manufacturing. When the pouring is completed, during the process of the lifter 200 ejecting the product, the runner material 002 can automatically separate from the lifter 200, which is convenient for product demolding and also convenient for subsequent processing of the runner material 002, reducing the processing difficulty and improving the operation efficiency.

[0045] In this embodiment, optionally, the rear mold core 100 has a rear mold surface that cooperates with the front mold core. A first cavity 110, an assembly groove 120, and a guiding through hole are provided on the rear mold surface. The first cavity 110 is elongated. A punch 300 is provided on the bottom wall of the first cavity 110. The punch 300 is elongated. The punch 300 is used to divide the first cavity 110 into two half-cavities, so that after injection molding is completed, a strip-shaped through hole 101 is formed at the punch 300. The notch of the assembly groove 120 communicates with the first cavity 110. The shape profile of the assembly groove 120 matches the shape profile of the lifter block 200. That is to say, the assembly groove 120 is used to assemble the lifter block 200. In other words, when the lifter block 200 is in the first position, the lifter block 200 is embedded in the assembly groove 120 and can cooperate with the first cavity 110 to jointly form the hollow bright strip 001. The guiding through hole communicates with the bottom of the assembly groove 120. The guiding through hole is a cylindrical hole and extends along a preset direction.

[0046] Furthermore, the punch 300 is arranged as a multi-segment structure. The multi-segment punches 300 are arranged at intervals in the length direction of the first cavity 110, and there is a spacing between adjacent punches 300.

[0047] Optionally, a wear-resistant sleeve 400 is provided in each guiding through hole. The cavity of the wear-resistant sleeve 400 extends along the preset direction.

[0048] It should be understood that the number of the assembly grooves 120 is set as required. A plurality of assembly grooves 120 can be arranged in the extending direction of the first cavity 110. Each assembly groove 120 can cooperate with a lifter block 200, and material injection can be carried out simultaneously from multiple positions, improving the injection molding efficiency while meeting the injection molding quality. For example, in this embodiment, the number of the assembly grooves 120 is six, three in a group. The two groups of assembly grooves 120 are respectively located on both sides in the width direction of the first cavity 110, and the six assembly grooves 120 are arranged at intervals in the extending direction of the first cavity 110. Obviously, in other embodiments, the number of the assembly grooves 120 and the lifter blocks 200 is not limited to six.

[0049] Please refer to Figures 6 - 7, in this embodiment, optionally, the lifter block 200 has a connected first mating surface 210 and a second mating surface 220. The first mating surface 210 is used to fit against the wall of the assembly groove 120, and the second mating surface 220 is used to fit against the front mold core; the groove 230 includes a first groove section 231, a second groove section 232, and two third groove sections 233. The first groove section 231 communicates with the second groove section 232 and there is an included angle between their extending directions. One end of the first groove section 231 away from the second groove section 232 extends to the second mating surface 220; one end of each of the two third groove sections 233 communicates with the second groove section 232, and the other end of each of the two third groove sections 233 extends to the second mating surface 220. The cross-sectional shapes of the first groove section 231 and the second groove section 232 can both be arc-shaped or square-shaped, etc., and form a main runner with an annular outer contour of the cross-section after cooperating with the rear mold core 100. Both of the two third groove sections 233 are conical, the groove width of the third groove section 233 is a gradient type, and the groove width of the third groove section 233 gradually decreases from the end where the third groove section 233 communicates with the second groove section 232 to the other end. The cross-sectional area of the gate 234 is small, which is convenient for subsequent processing; at the same time, it is beneficial to maintain the pressure of the plastic and facilitate injection molding filling. In other words, the cross-section of the sub-runner jointly defined by the third groove section 233 and the rear mold core 100 is a gradient type, and the cross-sectional area of the sub-runner gradually decreases from the end close to the main runner to the other end.

[0050] Optionally, the cross-sectional profile of the sub-runner is circular, elliptical, square, etc.

[0051] Furthermore, a splicing rib 500 is provided on the second mating surface 220 of the lifter block 200. One splicing rib 500 is embedded between adjacent convex molds 300. The convex mold 300 and the splicing rib 500 form a continuous structure and jointly form the strip-shaped through hole 101 of the hollow bright strip 001. The openings of the two third grooves 230 are located on both sides of the splicing rib 500.

[0052] In this embodiment, when the lifter block 200 is in the first position, the lifter block 200 is embedded in the assembly groove 120, the side surfaces of the lifter block 200 are respectively in contact with the side walls of the assembly groove 120, and the second mating surface 220 is one of the side surfaces of the lifter block 200. After the second mating surface 220 is in contact with the side wall of the groove of the lifter block 200, the first groove section 231 and the second groove section 232 form the main runner, and the third groove section 233 forms the sub-runner.

[0053] The gating system of the hollow bright strip 001 mold provided in this embodiment conveys plastic into the main runner through one hot nozzle. The plastic flows out from the two sub-runners respectively. The two sub-runners are respectively located on both sides of the strip-shaped through hole 101 of the hollow bright strip 001, and can perform injection molding from both sides simultaneously, improving the injection molding efficiency and the injection molding quality. Moreover, one hot nozzle cooperates with two sub-runners for operation, reducing costs. The runner is arranged on the lifter block 200, reducing the processing cost.

[0054] This embodiment also provides an injection mold, which includes a front mold core and the hollow bright bar 001 mold gating system mentioned in the above embodiment. The front mold core is provided with a second cavity. The front mold core is used to cooperate with the rear mold core 100 so that the first cavity 110 and the second cavity cooperate to form the inner cavity of the molded hollow bright bar 001. That is to say, the front mold core can move relative to the rear mold core 100 along the mold opening and closing direction. The front mold core can be closed with the rear mold core 100, and the first cavity 110 can cooperate with the second cavity to form the inner cavity. After injection molding, the front mold core is separated from the rear mold core 100, which is convenient for demolding.

[0055] Optionally, the injection mold further includes a driving mechanism 600. The driving mechanism 600 is connected to the lifter 200 and is used to drive the lifter 200 to reciprocate relative to the rear mold core 100 in a preset direction. For example, in this embodiment, the driving mechanism 600 includes a ejector plate, a lifter base 610 and a connecting rod 620. The lifter base 610 is connected to the ejector plate. The lifter base 610 is provided with a chute 611 extending perpendicular to the preset direction; the connecting rod 620 is inserted into the wear-resistant sleeve 400 in the guiding through hole and is slidably matched with the wear-resistant sleeve 400 in the preset direction. One end of the connecting rod 620 is slidably matched with the chute 611, and the other end of the connecting rod 620 is connected to the lifter 200. After mold opening, the ejector plate moves upward in the vertical direction, and drives the lifter 200 to move in the preset direction to eject the hollow bright bar 001 through the lifter base 610 and the connecting rod 620. And during the process of the lifter 200 ejecting the hollow bright bar 001, the lifter 200 is separated from the runner material 002 to realize demolding.

[0056] The injection mold provided in this embodiment has a simple structure, low cost, and high injection molding quality.

[0057] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gating system for a hollow bright bar mold, wherein the hollow bright bar (001) has a strip-shaped through hole (101), characterized in that, Comprising: A rear mold core (100), the rear mold core (100) being provided with a first cavity (110); And a lifter block (200) having a groove (230) formed on its side surface. The lifter block (200) is slidably engaged with the rear mold core (100) along a preset direction, so that the lifter block (200) has a first position and a second position that can be switched with each other. When in the first position, the lifter block (200) is embedded in the rear mold core (100), and the two together define a connected main runner and two sub-runners at the groove (230). The gates (234) of the two sub-runners are both communicated with the first cavity (110), and the gates (234) of the two sub-runners are respectively located on both sides of a punch (300) for forming a strip-shaped through hole (101). When in the second position, the lifter block (200) disengages from the rear mold core (100) and can be separated from the runner material (002); Wherein, the preset direction has an included angle with the mold opening and closing direction; The lifter block (200) has a connected first mating surface (210) and a second mating surface (220). The first mating surface (210) is used to fit with the cavity wall of the first cavity (110), and the second mating surface (220) is used to fit with the front mold core. The groove (230) includes a first groove section (231), a second groove section (232), and two third groove sections (233). The first groove section (231) is communicated with the second groove section (232) and the extending directions of the two have an included angle. One end of the first groove section (231) away from the second groove section (232) extends to the second mating surface (220). One end of each of the two third groove sections (233) is communicated with the second groove section (232), and the other end of each of the two third groove sections (233) extends to the second mating surface (220); The first groove section (231) and the second groove section (232) are used to form the main runner, and the two third groove sections (233) are used to form the two sub-runners; A splicing rib is provided on the second mating surface of the lifter block. One splicing rib is embedded between adjacent punches. The punch and the splicing rib form a continuous structure for jointly forming a strip-shaped through hole of a hollow bright bar. The openings of the two third groove sections are located on both sides of the splicing rib.

2. The glue injection system of the hollow bright bar mold according to claim 1, wherein: The cross-sectional area of the sub-runner gradually decreases from one end close to the main runner to the other end.

3. The glue injection system of the hollow bright bar mold according to claim 2, wherein: The cross-sectional profile of the sub-runner is circular or elliptical.

4. The glue injection system of the hollow bright bar mold according to claim 1, wherein: The outer contour of the cross-section of the main runner is arc-shaped.

5. The glue injection system of the hollow bright bar mold according to claim 1, wherein: The glue injection system of the hollow bright bar mold further includes a hot nozzle, and the hot nozzle is communicated with the main runner.

6. The glue injection system of the hollow bright bar mold according to claim 1, wherein: The number of the lifters (200) is multiple, and the multiple lifters (200) are arranged at intervals in the extending direction of the first cavity (110).

7. An injection mold for molding a hollow bright strip (001), characterized in that, The injection mold includes: A front mold core and the glue injection system of the hollow bright bar mold according to any one of claims 1-6. The front mold core is provided with a second cavity, and the front mold core is used to cooperate with the rear mold core (100) so that the first cavity (110) and the second cavity cooperate to form the inner cavity for molding the hollow bright bar (001).

8. The injection mold according to claim 7, wherein: The injection mold further includes a driving mechanism (600). The driving mechanism (600) is connected to the lifter (200) and is used to drive the lifter (200) to reciprocate relative to the rear mold core (100) in the preset direction.

9. The injection mold according to claim 8, wherein: The rear mold core (100) is provided with a guiding through hole extending in the preset direction; the driving mechanism (600) includes a ejector plate, a lifter base (610) and a connecting rod (620). The lifter base (610) is connected to the ejector plate, and the lifter base (610) is provided with a sliding groove (611); the connecting rod (620) is disposed in the guiding through hole, one end of the connecting rod (620) is slidably engaged with the sliding groove (611), and the other end of the connecting rod (620) is connected to the lifter (200).

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