Injection mold inclined core-pulling structure and demolding method thereof

Abstract

The application provides an injection mold inclined core-pulling structure and a demolding method thereof, adopts a two-plate mold structure, and sequentially comprises an upper fixed plate, a fixed mold plate, a movable mold plate, a mold foot and a lower fixed plate from top to bottom; the fixed mold plate and the movable mold plate are respectively provided with a fixed mold core and a movable mold core; the mold foot is provided with a ejector pin plate movement space, and the ejector pin plate movement space is provided with an upper ejector pin plate and a lower ejector pin plate; the movable mold core is provided with an inclined core-pulling mechanism and a straight ejecting assembly. The mechanism is mainly composed of the inclined core-pulling mechanism and the straight ejecting assembly, and the inclined core-pulling mechanism is driven out by the straight ejecting assembly. The application optimizes the secondary ejection mode, can realize straight ejection, retreat after ejection, smoothly completes product reverse clamping demolding, can effectively simplify the mold structure, avoids using movable mold side elastic plates or oil cylinder structures, can reduce the mold manufacturing cost, can improve the mold operation stability, and effectively reduces the abnormal occurrence in the use process.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of injection mold, in particular to an injection mold inclined core-pulling structure and a demolding method thereof. BACKGROUND

[0002] In the mold of plastic products, some products have lateral holes or boss structures that are inconsistent with the mold opening direction, which hinder the demolding of the products after molding. This structure is called reverse buckle in the mold. The mechanisms commonly used to solve reverse buckling include "slider" and "inclined top". When the mold is opened, the core-pulling mechanism is driven by the vertical opening force and decomposes into a horizontal core-pulling action in an inclined direction, thereby ensuring that the "reverse hook" is separated from the mold position before the product is ejected, and the product is smoothly ejected. There are many types of reverse buckling in the mold, including internal and external reverse buckling. Reverse buckling can be divided into horizontal reverse buckling parallel to the parting surface and inclined reverse buckling at a certain angle to the parting surface. Among them, inclined reverse buckling is the most difficult to solve in mold design. In mold design, inclined core-pulling structure is usually used to solve the inclined reverse buckling of the product.

[0003] However, the inclined core-pulling structure increases the complexity of the mold structure, which affects the stability of production and increases the cost of production and maintenance. In addition, the mold with inclined core-pulling structure often uses a spring plate structure, which not only has a complex structure, but also requires two parting operations of the moving mold to complete the core-pulling movement. SUMMARY

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide an injection mold inclined core-pulling structure and a demolding method thereof to solve the above-mentioned problems.

[0005] The technical scheme adopted by the present application to solve its technical problems is:

[0006] An injection mold inclined core-pulling structure, wherein, from top to bottom, it comprises an upper fixed plate, a fixed mold plate, a movable mold plate, a mold foot and a lower fixed plate; the fixed mold plate and the movable mold plate are respectively provided with fixed mold cores and movable mold cores, the mold foot is provided with a needle plate movement space, and the needle plate movement space is provided with an upper needle plate and a lower needle plate; the movable mold core is provided with an inclined core-pulling mechanism and a straight top assembly, the top of the straight top assembly is connected with the inclined core-pulling mechanism, the top of the straight top assembly is connected with the fixed mold core, and the bottom of the straight top assembly passes through the upper needle plate and the lower needle plate and is connected with the lower fixed plate through a limiting screw.

[0007] As a further improvement of the present application: the inclined core pulling mechanism comprises an inclined core pulling slider, an inclined core pulling slider seat and a slider fixing block; one end of the inclined core pulling slider is connected with the straight ejector assembly, the other end of the inclined core pulling slider is connected with the inclined core pulling slider seat, and the bottom of the inclined core pulling slider seat is provided with the slider fixing block; the inclined core pulling slider seat is provided with an inclined T-shaped groove, and the inclined core pulling slider is arranged in the T-shaped groove of the inclined core pulling slider fixing seat.

[0008] As a further improvement of the present application: the straight ejector assembly comprises a straight ejector, a straight ejector rod, a nylon opening and closing device and an ejector rod fixing block; the nylon opening and closing device and the straight ejector rod are arranged on the ejector rod fixing block, the top of the straight ejector rod is provided with the straight ejector, and the straight ejector is connected with the inclined core pulling slider.

[0009] As a further improvement of the present application: the straight ejector assembly further comprises a reset spring; the reset spring is sleeved on the straight ejector rod, the bottom of the reset spring is connected with the ejector rod fixing block, and the top of the reset spring is connected with the movable die plate through a guide sleeve.

[0010] As a further improvement of the present application: a limiting block is further arranged on the side of the upper ejector pin plate facing the movable die plate.

[0011] Another improvement of the present application is a demolding method of the inclined core pulling structure of the injection mold, which uses the inclined core pulling structure of the injection mold as described above, and is characterized by comprising the following steps.

[0012] S1: after the mold is injection molded, the movable die plate moves downward to separate the movable die plate and the fixed die plate, and the mold is opened;

[0013] S2: after the mold opening is completed, the upper ejector pin plate and the lower ejector pin plate are pushed upward by the ejector rod of the injection molding machine, and at the same time, the straight ejector assembly moves upward to drive the inclined core pulling slider to move obliquely upward along the T-shaped groove of the inclined core pulling slider seat;

[0014] S3: the upper ejector pin plate and the lower ejector pin plate continue to move until the limiting screw is clamped in the limiting groove and cannot move, and the upward movement and the oblique movement stop, forcing the inclined core pulling slider to move obliquely downward along the T-shaped groove to separate from the product, and the product is completed demolding by reverse buckling.

[0015] As a further improvement of the present application: after the demolding is completed, a reset step is further included and is as follows:

[0016] S4: after the upper ejector pin plate and the lower ejector pin plate continue to move and the nylon opening and closing device forcibly moves to completely separate from the lower ejector pin plate, the straight ejector assembly is reset by the reset spring to drive the inclined core pulling mechanism to move reversely and reset;

[0017] S5: The upper and lower ejector plates continue to move, and the product continues to be ejected under the action of the ejector pins. When the limit block touches the bottom surface of the moving template, the injection molding machine ejector rod retracts, and the upper and lower ejector plates return to their original positions under the action of the return spring.

[0018] As a further improvement of the present invention: after the reset is completed, a mold closing step is also included as follows:

[0019] S6: The moving template moves upward. When the return rod touches the fixed template, the nylon opener is pressed and reset by the lower ejector plate. The mold closing is completed after the lower ejector plate touches the sensing block of the micro switch.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] This invention adopts a two-plate mold design, which enables direct ejection followed by retraction, smoothly completing the product's undercut demolding. It effectively simplifies the mold structure, avoids the use of moving mold side spring plates or hydraulic cylinder structures, reduces mold manufacturing costs, improves mold operation stability, and effectively reduces the occurrence of abnormalities during use. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention.

[0023] Figure 2 This is a partial structural schematic diagram of the present invention.

[0024] Figure 3 This is a schematic diagram of the structure of Embodiment 3 of the present invention.

[0025] Figure 4 This is a schematic diagram of the structure of a third embodiment of the present invention. Detailed Implementation

[0026] The present invention will now be further described in conjunction with the accompanying drawings and embodiments:

[0027] Example 1: This example provides the following... Figure 1 The shown injection mold oblique core-pulling structure is characterized by comprising, from top to bottom, an upper fixed plate 99, a fixed template 1, a movable template 2, a mold base 3, and a lower fixed plate 4; a fixed mold core 11 and a movable mold core 12 are respectively provided in the fixed template 1 and the movable template 2; an ejector plate movement space 31 is provided in the mold base 3, and an upper ejector plate 32 and a lower ejector plate 33 are provided in the ejector plate movement space 31; an oblique core-pulling mechanism 5 and a straight ejector assembly 6 are provided in the movable mold core 12; the oblique core-pulling mechanism 5 is connected to the top of the straight ejector assembly 6; the top of the straight ejector assembly 6 is connected to the fixed mold core 11; and the bottom of the straight ejector assembly 6 passes through the upper ejector plate 32 and the lower ejector plate 33 and is connected to the lower fixed plate 4 by a limiting screw 7.

[0028] In the embodiment, the relative position of the movable and fixed molds is positioned by the movable mold plate 2 and the fixed mold plate 1, and the accuracy of the relative position in the working process of the injection mold is ensured. The mold pin 11 and the movable mold pin 12 are the central regions of the processed injection products, the ejector pin movable cavity arranged in the mold foot 3 is used for the up-down movement of the upper ejector pin plate 32 and the lower ejector pin plate 33, so that the upper ejector pin plate 32 and the lower ejector pin plate 33 are pushed out upwardly along with the movement of the injection machine top rod when the injection machine top rod moves, thereby driving the straight ejection assembly 6 to move upwardly, driving the inclined core pulling mechanism 5 to move obliquely through the upward movement of the straight ejection assembly 6, helping the subsequent product to complete demolding when the undercut is pulled, and the straight ejection assembly 6 is used for ejecting the product and driving the inclined core pulling slider 51 to move. The top of the limiting screw 7 is fixed in the straight ejection assembly 6, the bottom of the limiting screw 7 is movably fixed through the screw groove 71 in the lower fixed plate 4, the limiting screw 7 moves and is limited through the screw groove 71, and the upward movement distance of the straight ejection 61 is controlled.

[0029] In the embodiment, the inclined core pulling mechanism 5 includes the inclined core pulling slider 51, the inclined core pulling slider seat 52 and the slider fixing block 53; one end of the inclined core pulling slider 51 is fixedly connected with the straight ejection assembly 6, the other end of the inclined core pulling slider 51 is connected with the inclined core pulling slider seat 52, and the bottom of the inclined core pulling slider seat 52 is provided with the slider fixing block 53; the inclined core pulling slider seat 52 is provided with an oblique T groove 521, and the other end of the inclined core pulling slider 51 is arranged in the T groove 521 of the inclined core pulling slider 51 fixing seat, and the T groove 521 of the inclined core pulling slider seat 52 enables the inclined core pulling slider 51 to move obliquely back and forth along the T groove 521.

[0030] In the embodiment, the straight ejection assembly 6 includes the straight ejection 61, the straight ejection rod 62, the nylon opening and closing device 63 and the top rod fixing block 64; the top rod fixing block 64 is provided with the nylon opening and closing device 63 and the straight ejection rod 62, the top of the straight ejection rod 62 is provided with the straight ejection 61, and the straight ejection 61 is connected with the inclined core pulling slider 51. The bottom of the top rod fixing block 64 is fixedly connected with the limiting screw 7, the top rod fixing block 64 is arranged in the fixing block groove 641 at the bottom of the lower ejector pin plate 33, the nylon opening and closing device 63 is arranged in the opening and closing device sliding groove 631 between the lower ejector pin plate 33 and the upper ejector pin plate 32 and moves back and forth through the opening and closing device sliding groove 631. The nylon opening and closing device 63 plays a role in controlling and ensuring the ejection sequence during the ejection movement.

[0031] In order to make the straight top assembly 6 reset after the product is demolded, the straight top assembly 6 further comprises a reset spring 65, the reset spring 65 is sleeved on the straight top rod 62, the bottom of the reset spring 65 is connected with the top rod fixing block 64, and the top of the reset spring 65 is connected with the movable die plate 2 through a guide sleeve 66. The straight top assembly 6 and the inclined core pulling mechanism 5 are reset through the reset spring 65. And the guide sleeve 66 plays a guiding role in the ejection movement.

[0032] In order to make the product enter the reset movement after being ejected, a limiting block 67 is further arranged on the side of the upper ejector plate 32 facing the movable die plate 2. The limiting block 67 abuts against the movable die plate 2 when being upwardly ejected, so as to limit the straight top assembly 6, the upper ejector plate 32 and the lower ejector plate 33 from continuing to move upwardly, so that the injection molding machine retreats after sensing the contact between the limiting block 67 and the movable die plate 2, so as to end the ejection movement.

[0033] In order to further perform the clamping movement after resetting, a reset rod 8 is further arranged in the movable die plate 2, the top of the reset rod 8 is higher than the top of the movable die plate 2, and the bottom of the reset rod 8 is connected with the upper ejector plate 32. In this way, the clamping movement can be performed after the reset rod 8 contacts the fixed die plate 1.

[0034] In order to determine whether the clamping movement is ended, a micro switch 9 is further arranged in the lower fixed plate 4, the micro switch 9 is provided with a sensing block 91, and the top of the sensing block 91 is higher than the top of the lower fixed plate 4. When the lower ejector plate 33 moves downwardly and touches the sensing block 91 of the micro switch 9, it is determined that the clamping process is ended. Embodiment two:

[0035] The embodiment provides a demolding method of the inclined core pulling structure of the injection mold, and the injection mold inclined core pulling structure is used, and the demolding method comprises the following steps.

[0036] S1: after the mold is injection molded, the movable die plate 2 and the fixed die plate 1 are separated by backward clamping movement, and the mold is opened;

[0037] S2: after the mold is opened, the upper ejector plate 32 and the lower ejector plate 33 are upwardly ejected, and the straight top assembly 6 is upwardly ejected, so that the inclined core pulling mechanism 5 is inclinedly moved;

[0038] S3: the upper ejector plate 32 and the lower ejector plate 33 continue to move, and when the limiting screw 7 is clamped in the limiting groove and cannot move upwardly, the ejection movement and the inclined movement are stopped, and the product is demolded by completing the reverse buckling.

[0039] After the demolding is completed, a reset step is further included, and the reset step is as follows:

[0040] S4: The upper ejector plate 32 and the lower ejector plate 33 continue to move, the nylon opening and closing device 63 moves away from the lower ejector plate 33, the straight ejector assembly 6 is reset by the reset spring 65, and the inclined core pulling mechanism 5 is reset by reverse inclined movement;

[0041] S5: The upper ejector plate 32 and the lower ejector plate 33 continue to move, the product continues to be ejected under the action of the ejector pin, and retreats when the limiting block 67 touches the bottom surface of the movable die plate 2. The upper ejector plate 32 and the lower ejector plate 33 retreat and reset under the action of the reset spring 65.

[0042] After resetting, the clamping step is as follows:

[0043] S6: The movable die plate 2 moves upward, the nylon opening and closing device 63 is reset by being pressed by the lower ejector plate 33 when the reset rod 8 moves out of the fixed die plate 1, and the clamping is completed when the lower ejector plate 33 contacts the sensing block 91 of the micro switch 9. Embodiment three:

[0044] As shown in the accompanying drawings Figure 3 , the embodiment provides an inclined core pulling mechanism, which comprises an upper die fixing part 10, a fixed die part 101, a movable die part 102, a movable die spring plate 103, a die foot part 104, an upper ejector part 105, a lower ejector part 106, a lower die fixing part 107, a nylon opening and closing part 108, a fixed die part 109, an inclined core pulling sliding part 110, a movable die part 111, a sliding seat part 112, a reset rod pull head 113, a reset rod part 114, a spring plate spring 115, a limiting part 116, a garbage pin part 117, a limiting screw part 118, a micro switch part 119, a micro switch stop block 120, a ejector rod part 121, and an ejector rod fixing part 122. The nylon opening and closing part 108 is used for controlling the opening and closing sequence. The limiting screw part 118 is used for controlling the upward movement distance of the straight ejector. The spring plate spring 115 is used for assisting the movable die spring plate 103 to move.

[0045] The installation steps of the inclined core pulling mechanism in the embodiment are as follows:

[0046] The inclined core pulling mechanism is installed: after the inclined core pulling sliding part 110 is installed in the inclined hole of the movable die part 111 to a suitable position, the sliding seat part 112 is connected with the inclined core pulling sliding part 110 through a T slot. The inclined core pulling sliding part 110 can move along the T slot designed by the sliding seat part 112.

[0047] The inclined core pulling mechanism is fixed: first, the spring plate spring 115 is installed, and then the sliding seat part 112 is fixed on the movable die spring plate 103 by a screw. The limiting screw part 118 is locked on the movable die spring plate 103 through the movable die plate part.

[0048] Install the upper and lower ejector pins 105 and 106 and the return rod puller 113, install the foot piece 104 and the lower fixing piece; the return rod piece 114 and the spring are used for resetting the ejector plate; the return rod puller 113 is used for limiting the ejector plate to prevent the ejector plate from retreating.

[0049] Install the micro switch assembly, i.e. the micro switch piece 119, the micro switch block 120, the top rod piece 121 and the top rod fixing piece 122. The micro switch assembly is used for sensing the reset signal of the ejector plate. In the embodiment, the movable die piece 102 and the movable die plate 103 are not fixed by screws and can be separated from each other. The opening distance is the distance set by the limiting screw piece 118. The movable die plate 103, the foot piece 104 and the lower die fixing piece 107 are fixed by screws and can move as a whole.

[0050] The movement process of the third embodiment:

[0051] Opening the mold: the opening process of the mold is completed in two steps on the movable die side.

[0052] First step: after the mold is injection molded, the movable die side moves backward, i.e. the movable die plate 103, the foot piece 104 and the lower die fixing piece 107 move downward, the movable die piece 102 is separated from the movable die plate 103, the movable die plate 103 and the slide base piece 112 move backward together, the slide base piece 112 drives the inclined core-pulling slide piece 110 to move downward along the inclined T-shaped groove and separates from the product undercut.

[0053] Second step: when the movable die plate 103 moves to the distance set by the limiting screw piece 118, the movable die piece 102 starts to move downward under the action of the limiting screw piece 118, forcing the nylon opening and closing piece 108 to completely separate from the fixed die piece 101, and completing the opening of the fixed die piece 101 and the movable die piece 102.

[0054] Ejection process: after the mold is opened, the upper and lower ejector pins 105 and 106 move under the action of the injection molding machine ejector rod, completing the ejection of the product. When the limiting piece 116 touches the bottom surface of the movable die plate 103, the injection molding machine ejector rod retreats, and the ejection process ends. The ejector plate retreats under the action of the reset spring. When the micro switch block 120 touches the micro switch piece 119, a mold closing signal is sent.

[0055] Mold closing: the movable die side, i.e. the movable die piece 102, the movable die plate 103, the foot piece 104, the upper and lower ejector pins 105 and 106 and the lower die fixing piece 107 move forward (the movement direction is opposite to that when the mold is opened), the nylon opening and closing piece 108 is forced to reset under the pressure of the fixed die piece 101, and the movable die plate 103 and the movable die piece 102 are reset under force. The mold closing process ends.

[0056] Detailed description of the present application:

[0057] The installation steps of the inclined core pulling structure of the present application are as follows:

[0058] Install the straight ejector and the straight ejector rod: fix them into the movable mold core by the pin;

[0059] Install the inclined core pulling mechanism: after the inclined core pulling slider is installed into the inclined hole of the straight ejector to the appropriate position, the sliding slider base is connected with the inclined core pulling slider through the T slot, and the connection through the T slot allows relative sliding;

[0060] Fix the inclined core pulling mechanism: after the inclined core pulling slider base is connected with the inclined core pulling slider through the T slot, adjust the inclined core pulling slider base to the appropriate position, and fix the slider fixing block to the bottom of the movable mold core by the screw; the straight ejector and the inclined core pulling slider are not fixed. The straight ejector moves upward with the mold ejection, and the inclined core pulling slider moves obliquely downward along the inclined slot in the straight ejector.

[0061] Assemble the reset spring, the upper ejector plate and the lower ejector plate;

[0062] Assemble the nylon opening and closing device: fix it on the ejector rod fixing block by the screw; the straight ejector rod, the nylon opening and closing device are fixed on the ejector rod fixing block by the screw, and the three are moved upward as a whole with the mold ejection;

[0063] Fix the straight ejector rod on the ejector rod fixing block by the screw; the ejector rod fixing block and the lower ejector plate are not fixedly connected, and when the ejector plate moves to the set distance, the ejector rod fixing block can be separated from the lower ejector plate;

[0064] Install the lower fixed plate, and finally lock the limiting screw; the limiting screw passes through the lower fixed plate and is locked at the bottom of the ejector rod fixing block.

[0065] Working principle of the present application:

[0066] Mold opening: after the mold is injection molded, the movable mold side moves backward to open the mold, i.e. the movable mold plate 2 moves downward to separate the movable mold plate 2 and the fixed mold plate 1;

[0067] Ejection process:

[0068] First stage: after the mold is opened, the upper ejector plate 32 and the lower ejector plate 33 move upward under the action of the ejector rod of the injection molding machine, so that the straight ejector 61, the straight ejector rod 62, the nylon opening and closing device 63 and the ejector rod fixing block 64 in the straight ejector assembly 6 move upward together with the upper ejector plate 32 and the ejector plate, which promotes the straight ejector 61 and the product to move upward together, and the straight ejector 61 drives the inclined core pulling slider 51 to move obliquely upward along the T slot 521 of the inclined core pulling slider base 52.

[0069] Second stage: the straight top assembly 6 drives the limiting screw 7 to move upward along the screw groove, when the upper ejector plate 32 and the lower ejector plate 33 continue to move to the distance set by the limiting screw 7, that is, the limiting screw 7 is clamped at the top of the limiting groove and cannot move, the straight top assembly 6 stops moving, the straight top 61 and the inclined core-pulling slider 51 stop moving obliquely upward, at this time, since the straight top 61 stops moving, the inclined core-pulling slider 51 is forced to move obliquely downward along the T-shaped groove 521 to separate from the product, so that the product is demolded after the inverted buckle is completed.

[0070] Third stage: the upper ejector plate 32 and the lower ejector plate 33 continue to move upward in the ejector plate movement space 31, so that the nylon opening and closing device 63 forcibly separates from the lower ejector plate 33, after completely separating, since the return spring 65 is in a compressed state, the straight top 61 and the straight top rod 62 in the straight top assembly 6 move downward under the action of the return spring 65 to reset, at the same time, the straight top 61 drives the inclined core-pulling slider 51 to move reversely to reset.

[0071] Fourth stage: the upper ejector plate 32 and the lower ejector plate 33 continue to move upward in the ejector plate movement space 31, the product continues to be ejected under the action of the ejector pin, at this time, when the limiting block 67 touches the bottom surface of the movable mold plate 2, the injection molding machine ejector pin retreats, and the ejection process ends. The ejector plate retreats and resets under the action of the return spring 65.

[0072] The main function of the application: applied to the demolding device in the manufacturing of complex plastic products, a movable mold inclined core-pulling structure scheme is provided, a straight top 61 ejection driving inclined core-pulling movement mode is adopted, the inclined core-pulling movement is completed by means of the mold straight top 61 ejection, the movable mold side of the mold does not need to increase the mold opening action, the mold opening times are reduced, and the production cycle can be shortened. In order to ensure the smooth ejection and reset of the inclined core-pulling structure and optimize the mold ejection mode, a local secondary ejection structure is adopted. The straight top 61 is ejected once, stops moving after the inclined core-pulling mechanism 5 is demolded, the ejector pin continues to move to complete the secondary ejection, and the product is demolded after the inverted buckle is smoothly demolded. The structure is simple and reliable, the mold stability can be improved by using the device. In summary, the ordinary skilled in the art can make other various corresponding transformation schemes according to the technical scheme and technical concept of the application without creative mental labor after reading the application file, which belongs to the protection range of the application.

Claims

1. A slope core-pulling structure of an injection mold, characterized by comprising: From top to bottom in turn includes fixed die plate, movable die plate, die foot and lower fixed plate;The fixed die plate and the movable die plate are respectively provided with fixed die and movable die, the die foot is provided with a thimble plate movement space, the thimble plate movement space is provided with an upper thimble plate and a lower thimble plate;The movable die is provided with an inclined core pulling mechanism and a straight top assembly, the inclined core pulling mechanism is connected with the top of the straight top assembly, the top of the straight top assembly is connected with the fixed die, the bottom of the straight top assembly passes through the upper thimble plate and the lower thimble plate and is connected with the lower fixed plate through a limiting screw; The inclined core pulling mechanism includes an inclined core pulling slider, an inclined core pulling slider seat and a slider fixing block;One end of the inclined core pulling slider is connected with the straight top assembly, the other end of the inclined core pulling slider is connected with the inclined core pulling slider seat, the bottom of the inclined core pulling slider seat is provided with the slider fixing block;The inclined core pulling slider seat is provided with a T slot in the inclined direction, and the inclined core pulling slider is arranged in the T slot of the inclined core pulling slider fixing seat; The straight top assembly includes a straight top, a straight top rod, a nylon opener and a top rod fixing block;The top rod fixing block is provided with the nylon opener and the straight top rod, the top of the straight top rod is provided with the straight top, the straight top is connected with the inclined core pulling slider, and the straight top assembly further includes a reset spring;The reset spring is sleeved on the straight top rod, the bottom of the reset spring is connected with the top rod fixing block, the top of the reset spring is connected with the movable die plate through a guide sleeve, and further includes a limiting block, the limiting block is arranged on the side of the upper thimble plate facing the movable die plate.

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