Anti-retreat structure for slider of an injection mold

Abstract

The present invention discloses a structure for preventing the retraction of a slider in an injection mold, which includes: a first lifter base and a second lifter base fixed on the rear mold, and a slider that can slide on the rear mold; a first upper lifter and a first lower lifter that can slide on the first lifter guide rail are further provided on the first lifter base, a first inclined pressing surface is provided on the inner side of the first upper lifter, and a first pushing inclined surface is provided on the inner side of the first lower lifter; a second upper lifter and a second lower lifter that can slide on the second lifter guide rail are further provided on the second lifter base, a second inclined pressing surface is provided on the inner side of the second upper lifter, and a second pushing inclined surface is provided on the inner side of the second lower lifter; the slider is provided with a pressed inclined surface that cooperates with the first inclined pressing surface and the second inclined pressing surface; and a slider inclined surface that cooperates with the first pushing inclined surface and the second pushing inclined surface. The present invention can increase the acting force of the reverse lifter of the slider, playing a role in preventing the retraction of the slider. It has low cost and a simple structure, and solves the problem of flash caused by the retraction of the slider, resulting in defective products.

Description

Technical Field

[0001] The present invention relates to a structure for preventing the retraction of a slider in an injection mold.

Background Art

[0002] With the development of the plastic industry, the shapes of plastic products are becoming more and more diversified and complex. For some structures, driving devices such as oil cylinders are required to assist in core pulling. Under high injection pressure, there is a risk of the oil cylinder retracting, which will cause local defects in the product. Therefore, a set of anti-retraction mechanism is needed to prevent the slider from retracting.

[0003] The invention with the application number CN201822278324.8 discloses an injection mold for preventing the retraction of a slider. The invention includes a front mold, a rear mold, an inclined slider, and a slider block, a lifter base and a driving device provided at the bottom of the rear mold. The inclined slider is disposed through the rear mold. The top end of the inclined slider is a molding end, and the bottom end is a transmission end. The transmission end is fixedly connected to the top of the slider block. A slider inclined surface is provided at the bottom of the slider block. A pushing inclined surface matching the slider inclined surface is provided at the first end of the lifter base. The second end of the lifter base is connected to the driving end of the driving device. An anti-retraction insertion rod is vertically provided on the front mold, and a limit insertion hole is provided at the top of the lifter base. The anti-retraction insertion rod passes through the rear mold and is inserted into the limit insertion hole. In the injection mold of the invention, the anti-retraction insertion rod is provided on the front mold, and the length of the lifter base provided at the bottom of the rear mold is short. Therefore, it is only applicable to the anti-retraction of the slider at a relatively shallow position. Some sliders move downward at an angle of 45 degrees, the slider angle is large, the rubber position area is large, and the slider is large. Under the action of the injection pressure, relying solely on one lifter, it is easy for the product to generate flash, resulting in defective products.

Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a structure for preventing the retraction of a slider in an injection mold with low cost, simple structure, improved production efficiency, and solving the problem of flash generated by the retraction of the slider, resulting in defective products.

[0005] The purpose of the present invention is achieved as follows:

[0006] A structure for preventing the retraction of a slider in an injection mold, characterized in that it includes: a first lifter base and a second lifter base fixed on the rear mold, and a slider slidable on the rear mold.

[0007] A first lifter guide rail and a first pull rod are provided on the first lifter base. A first upper lifter and a first lower lifter slidable on the first lifter guide rail are further provided on the first lifter base. A first hook is provided between the first upper lifter and the first lower lifter. The front end of the first pull rod is fixed to the first lower lifter, and a first lifter return spring is provided at the rear end of the first pull rod. A first inclined pressure surface is provided inside the first upper lifter, and a first pushing inclined surface is provided inside the first lower lifter.

[0008] The second shovel base is provided with a second shovel guide rail and a second pull rod. The second shovel base is also provided with a second upper shovel and a second lower shovel that can slide on the second shovel guide rail. A second hook is provided between the second upper shovel and the second lower shovel. The front end of the second pull rod is fixed to the second lower shovel, and a second shovel return spring is provided at the rear end of the second pull rod. A second inclined pressing surface is provided inside the second upper shovel, and a second pushing inclined surface is provided inside the second lower shovel;

[0009] The slider is provided with a pressed inclined surface that cooperates with the first inclined pressing surface and the second inclined pressing surface; and a slider inclined surface that cooperates with the first pushing inclined surface and the second pushing inclined surface.

[0010] A slider anti-retreat structure of an injection mold as described above is characterized in that the rear mold is provided with a rear mold inclined surface, and the slider is provided with a slider inner inclined surface that cooperates with the rear mold inclined surface.

[0011] A slider anti-retreat structure of an injection mold as described above is characterized in that both the first hook and the second hook include an upper buckle and a lower buckle. A hook connecting rod is provided between the upper buckle and the lower buckle, and the hook connecting rod is also provided with a fixing screw.

[0012] A slider anti-retreat structure of an injection mold as described above is characterized in that the first upper shovel and the second upper shovel are provided with upper shovel fixing grooves for inserting the upper buckle, and the first lower shovel and the second lower shovel are provided with lower shovel fixing grooves for inserting the lower buckle; the first upper shovel and the second upper shovel are also provided with fixing holes that cooperate with the fixing screw.

[0013] The beneficial effects of the present invention are:

[0014] When the present invention is demolded, under the action of the first shovel return spring, the first pull rod drives the first lower shovel to move, and the first lower shovel drives the first upper shovel to move. At the same time, under the action of the second shovel return spring, the second pull rod drives the second lower shovel to move, and the second lower shovel drives the second upper shovel to move. After moving a certain distance, the slider can disengage from the buckling positions of the first inclined pressing surface of the first upper shovel and the second inclined pressing surface of the second upper shovel. When the mold is closed, the slider is reset. Under the action of the first upper shovel on the first lower shovel and the second upper shovel on the second lower shovel, the slider increases the reverse shovel force, playing a role in preventing the slider from retreating. It has low cost, simple structure, improves production efficiency, and solves the problem of flash caused by the retreat of the slider, resulting in defective products.

Description of the Drawings

[0015] Figure 1 is the structural diagram of the present invention;

[0016] Figure 2 is the structural diagram of the first shovel base, the second shovel base and the slider;

[0017] Figure 3 is the structural diagram of the first shovel base and the second shovel base;

[0018] Figure 4 is the structural diagram of the slider of the present invention;

[0019] Figure 5 is the structural diagram of the first upper shovel of the present invention;

[0020] Figure 6 is the structural diagram of the first lower shovel of the present invention;

[0021] Figure 7 is the structural diagram of the first draw hook of the present invention.

Detailed implementation manner

[0022] The present invention will be further described below with reference to the accompanying drawings:

[0023] A slider anti-retreat structure of an injection mold, which includes: a first shovel seat 1 and a second shovel seat 2 fixed on the rear mold 100, and a slider 3 that can slide on the rear mold 100,

[0024] The first shovel seat 1 is provided with a first shovel guide rail 11 and a first pull rod 12. The first shovel seat 1 is further provided with a first upper shovel 13 and a first lower shovel 14 that can slide on the first shovel guide rail. A first draw hook 15 is provided between the first upper shovel 13 and the first lower shovel 14. The front end of the first pull rod 12 is fixed to the first lower shovel 14, and a first shovel return spring 16 is provided at the rear end of the first pull rod 12. A first inclined pressure surface 17 is provided inside the first upper shovel 13, and a first push top inclined surface 18 is provided inside the first lower shovel 14;

[0025] The second shovel seat 2 is provided with a second shovel guide rail 21 and a second pull rod 22. The second shovel seat 2 is further provided with a second upper shovel 23 and a second lower shovel 24 that can slide on the second shovel guide rail. A second draw hook 25 is provided between the second upper shovel 23 and the second lower shovel 24. The front end of the second pull rod 22 is fixed to the second lower shovel 24, and a second shovel return spring 26 is provided at the rear end of the second pull rod 22. A second inclined pressure surface 27 is provided inside the second upper shovel 23, and a second push top inclined surface 28 is provided inside the second lower shovel 24;

[0026] The slider 3 is provided with a compression inclined surface 31 that cooperates with the first inclined pressure surface 17 and the second inclined pressure surface 27; and a slider inclined surface 32 that cooperates with the first push top inclined surface 18 and the second push top inclined surface 28.

[0027] When the mold is opened, under the action of the first ejector return spring 16, the first pull rod 12 pulls the first lower ejector 14 to move, and the first lower ejector 14 drives the first upper ejector 13 to move. At the same time, under the action of the second ejector return spring 26, the second pull rod 22 pulls the second lower ejector 24 to move, and the second lower ejector 24 drives the second upper ejector 23 to move. After moving a certain distance, the slider 3 can disengage from the locking positions of the first inclined pressure surface 17 of the first upper ejector 13 and the second inclined pressure surface 27 of the second upper ejector 23. When the mold is closed, the slider is reset. Under the action of the first upper ejector 13 on the first lower ejector 14 and the second upper ejector 23 on the second lower ejector 24, the slider increases the reverse ejector force, playing a role in preventing the slider from retreating.

[0028] The rear mold 100 of the present invention is provided with a rear mold inclined surface, and the slider 3 is provided with an inner inclined surface 33 of the slider that cooperates with the rear mold inclined surface.

[0029] The first hook 15 and the second hook 25 of the present invention both include an upper buckle 151 and a lower buckle 152. A hook connecting rod 153 is provided between the upper buckle 151 and the lower buckle 152, and the hook connecting rod 153 is also provided with a fixing screw 154.

[0030] The first upper ejector 13 and the second upper ejector 23 of the present invention are provided with an upper ejector fixing groove 131 for inserting the upper buckle 151, and the first lower ejector 14 and the second lower ejector 24 are provided with a lower ejector fixing groove 141 for inserting the lower buckle 152; the first upper ejector 13 and the second upper ejector 23 are also provided with fixing holes 231 that cooperate with the fixing screw 154.

[0031] The first upper ejector 13 of the present invention is provided with an upper ejector sliding groove 132 that cooperates with the first ejector guide rail 11, and the second upper ejector 23 is also provided with an upper ejector sliding groove 132 that cooperates with the second ejector guide rail 21. The first lower ejector 14 is provided with a lower ejector sliding groove 142 that cooperates with the first ejector guide rail 11, and the second lower ejector 24 is also provided with a lower ejector sliding groove 142 that cooperates with the second ejector guide rail 21. The first lower ejector 14 and the second lower ejector 24 are also provided with pull rod holes 143 connected to the pull rods.

Claims

1. A structure for preventing the retraction of the slider of an injection mold, characterized in that It includes: a first ejector base (1) and a second ejector base (2) fixed on the rear mold (100), and a slider (3) slidable on the rear mold (100), a first ejector guide rail (11) and a first pull rod (12) are provided on the first ejector base (1), a first upper ejector (13) and a first lower ejector (14) slidable on the first ejector guide rail are further provided on the first ejector base (1), a first hook (15) is provided between the first upper ejector (13) and the first lower ejector (14), the front end of the first pull rod (12) is fixed to the first lower ejector (14), a first ejector return spring (16) is provided at the rear end of the first pull rod (12), a first inclined pressure surface (17) is provided inside the first upper ejector (13), and a first push top inclined surface (18) is provided inside the first lower ejector (14); a second ejector guide rail (21) and a second pull rod (22) are provided on the second ejector base (2), a second upper ejector (23) and a second lower ejector (24) slidable on the second ejector guide rail are further provided on the second ejector base (2), a second hook (25) is provided between the second upper ejector (23) and the second lower ejector (24), the front end of the second pull rod (22) is fixed to the second lower ejector (24), a second ejector return spring (26) is provided at the rear end of the second pull rod (22), a second inclined pressure surface (27) is provided inside the second upper ejector (23), and a second push top inclined surface (28) is provided inside the second lower ejector (24); the slider (3) is provided with a pressure-receiving inclined surface (31) cooperating with the first inclined pressure surface (17) and the second inclined pressure surface (27); and a slider inclined surface (32) cooperating with the first push top inclined surface (18) and the second push top inclined surface (28); both the first hook (15) and the second hook (25) include an upper buckle (151) and a lower buckle (152), a hook connecting rod (153) is provided between the upper buckle (151) and the lower buckle (152), and a fixing screw (154) is further provided on the hook connecting rod (153); the first upper ejector (13) and the second upper ejector (23) are provided with upper ejector fixing grooves (131) for inserting the upper buckle (151), and the first lower ejector (14) and the second lower ejector (24) are provided with lower ejector fixing grooves (141) for inserting the lower buckle (152); the first upper ejector (13) and the second upper ejector (23) are further provided with fixing holes (231) cooperating with the fixing screw (154).

2. The structure for preventing the retraction of the slider of an injection mold according to claim 1, characterized in that the rear mold (100) is provided with a rear mold inclined surface, and the slider (3) is provided with a slider inner inclined surface (33) cooperating with the rear mold inclined surface.

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