Sliding block core-pulling mechanism and three-side core-pulling injection mold

Abstract

The invention belongs to the technical field of injection molds, and discloses a sliding block core-pulling mechanism and a three-face core-pulling injection mold.The sliding block core-pulling mechanism comprises a main body sliding block, a floating core-pulling block, a buckle assembly and a drag hook assembly capable of being opened and closed, and the main body sliding block is provided with an upper limiting sliding groove and a lower limiting sliding groove in the mold opening direction; the floating core pulling block is arranged in the lower limiting sliding groove in a sliding mode. The buckle assembly is arranged in the upper limiting sliding groove in a sliding mode, the buckle assembly is connected with the floating core pulling block, and a first spring is arranged between the buckle assembly or the floating core pulling block and the main body sliding block; and the drag hook assembly is arranged on a fixed mold of the injection mold. Through the buckling action and the separating action of the buckle assembly and the drag hook assembly, the spring only needs to provide very small holding force in the whole movement process, too large compression force is not needed, the situation that the spring works in the large compression amount state is effectively avoided, the working load of the spring is reduced, and fatigue damage of the spring is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molds, and in particular relates to a slider core-pulling mechanism and a three-side core-pulling injection mold. Background Art

[0002] Injection molds are important process equipment for producing various industrial products. With the rapid development of the plastics industry and the promotion and application of plastic products in aviation, aerospace, electronics, machinery, shipbuilding and automobile industries, the scope of application of injection molds is becoming more and more extensive. Injection molds are a tool for producing plastic products, and are also a tool for giving plastic products a complete structure and precise dimensions. Injection molding is a processing method used in the mass production of certain parts with complex shapes. Specifically, it refers to the high-pressure injection of heated and melted plastic into the mold cavity by the injection molding machine, and after cooling and solidification, a molded product is obtained.

[0003] During the injection mold molding process, due to the structural characteristics of the product, it is often necessary to design multiple motion mechanisms on the mold to realize the demolding process of the product, and each motion mechanism needs to have a necessary sequence to ensure that its motion mechanism is not interfered with. For some special products, a three-sided slider structure is required during mold injection molding, and demolding is achieved through three-sided core pulling. Among them, the main slider needs to core-pull the floating core pulling block inside it along the mold opening direction before it can perform normal core pulling. According to the structural design of the mold, the usual solution is to set a spring floating core pulling mechanism in the main slider to achieve core pulling. From the dynamic simulation of the mold structure, this structure can fully realize the injection molding of existing products. However, considering the specific movement details of this solution, there are still certain technical risks, which may cause the spring floating core pulling mechanism in the slider to fail, causing the mold to be unable to proceed smoothly during the production process. The specific technical difficulties and technical risks are as follows: 1. The core pulling power of the spring floating core pulling mechanism in the main slider comes entirely from the elastic force of the spring, and the magnitude of the elastic force is determined by the amount of compression of the spring. In order to ensure the smooth implementation of the spring floating core pulling mechanism, sufficient elastic force is required, and the compression of the spring must be increased. In the long-term injection molding production process, this will cause the spring to be in a state of high-intensity compression for a long time, which will seriously affect the life of the spring; 2. As the injection molding production of this mold proceeds, the molding surface of the mold parts will become increasingly rough due to long-term friction with the molded plastic product, thereby increasing the clamping force of the injection molded product on the mold parts. This will cause the core pulling resistance of the floating core pulling block in the main slider to be greater than the elastic force provided by the spring, causing the spring floating core pulling mechanism to fail; 3. Since the spring floating core pulling mechanism in the main slider is driven entirely by the elastic force of the spring during the entire movement process, the spring will also have a certain life cycle during normal use. With the long-term injection molding production of the mold, the spring will also gradually decay due to fatigue damage, thus causing the mold movement to fail. Summary of the invention

[0004] The purpose of the present invention is to provide a slider core-pulling mechanism and a three-side core-pulling injection mold to solve the above-mentioned problems existing in the prior art.

[0005] In order to achieve the above-mentioned purpose, on the one hand, the present invention adopts the following technical scheme: a slider core pulling mechanism, comprising a main slider, a floating core pulling block, a buckle assembly and an openable and closable hook assembly, wherein the main slider is slidably arranged on the movable mold of the injection mold, and the main slider is provided with an upper limit slide groove and a lower limit slide groove along the mold opening direction, and the floating core pulling block is slidably arranged in the lower limit slide groove; the buckle assembly is slidably arranged in the upper limit slide groove, and the buckle assembly is connected to the floating core pulling block, and a first spring is provided between the buckle assembly or the floating core pulling block and the main slider; the hook assembly is arranged on the fixed mold of the injection mold, and when the fixed mold and the movable mold of the injection mold are closed, the hook assembly presses the buckle assembly to make the floating core pulling block extend out of the lower limit slide groove, and the hook assembly gradually closes and completes the buckling action with the buckle assembly; when the fixed mold and the movable mold of the injection mold are opened, the hook assembly extends into the lower limit slide groove with the floating core pulling block through the buckle assembly, and the hook assembly gradually opens and completes the separation action with the buckle assembly.

[0006] As an optional implementation of the above technical solution, the hook assembly includes a hook fixing block, a hook, a second spring and a top pressure cover plate, two hooks are rotatably arranged on the hook fixing block, the second spring is arranged between the two hooks, and the top pressure cover plate is arranged at the bottom of the hook fixing block, and the top pressure cover plate is used to press the buckle assembly to deform the first spring.

[0007] As an optional implementation of the above technical solution, a limiting channel is provided on the draw hook fixing block, and the draw hook is rotatably arranged in the limiting channel through a connecting pin.

[0008] As an optional implementation of the above technical solution, the side wall of the hook is provided with a fixing groove, and the two ends of the second spring are respectively clamped in the fixing grooves of the two side walls of the hook.

[0009] As an optional implementation of the above technical solution, an open groove is provided at the bottom of the hook fixing block, an installation groove adapted to the second spring is provided on the inner wall of the open groove, and the top pressure cover plate is fixed in the open groove by bolts.

[0010] As an optional implementation of the above technical solution, the buckle assembly includes a clamping block and a connecting piece, the clamping block is connected to the floating core pulling block through the connecting piece, the clamping block is slidably set in the upper limit slide groove, and the clamping block is provided with a clamping groove adapted to the pull hook.

[0011] As an optional implementation of the above technical solution, the side wall of the blocking block is provided with a first guide bevel and a first hook surface connected at an angle, and the inner side of the pull hook is provided with a second guide bevel and a second hook surface connected at an angle, the first guide bevel and the second guide bevel match each other, and the first hook surface and the second hook surface match each other.

[0012] As an optional implementation of the above technical solution, the side wall of the upper limit slide groove is provided with a third guide slope, the third guide slope is arranged opposite to the first guide slope, and the outer side of the pull hook is provided with a fourth guide slope, the fourth guide slope matches the third guide slope.

[0013] As an optional implementation of the above technical solution, the first spring is arranged in the upper limit sliding groove and abuts against the blocking block.

[0014] On the other hand, the present invention adopts the following technical scheme: a three-sided core-pulling injection mold, including the above-mentioned slider core-pulling mechanism, and also including a fixed mold, a movable mold, a first side slider, a second side slider and a driving mechanism, the first side slider and the second side slider are respectively arranged on both sides of the main slider, and the fixed mold is provided with a first core-pulling bent pin and a second core-pulling bent pin, the first core-pulling bent pin is inserted on the first side slider, and the second core-pulling bent pin is inserted on the second side slider, and the output end of the driving mechanism is connected to the main slider.

[0015] The beneficial effects of the present invention are: Through the snapping action and the separating action of the buckle assembly and the hook assembly, the spring only needs to provide a very small holding force during the entire movement process, and no too large compression force is required, which effectively avoids the spring working under a large compression amount, reduces the working load of the spring, and avoids fatigue damage of the spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of a buckle assembly and a hook assembly in one embodiment of the present invention; Figure 2 It is a schematic structural diagram of a main body slider and a buckle assembly in one embodiment of the present invention; Figure 3 is a diagram showing a separated state of a buckle assembly and a hook assembly in one embodiment of the present invention; Figure 4 is a diagram of the buckle assembly and the hook assembly in a buckled state in one embodiment of the present invention; Figure 52 is a schematic structural diagram of a three-sided core-pulling injection mold in one embodiment of the present invention; Figure 6 It is a schematic structural diagram of a movable mold in one embodiment of the present invention; Figure 7 It is a structural schematic diagram of a fixed mold in one embodiment of the present invention; Figure 8 It is a sliding state diagram of a main slider, a first side slider and a second side slider in one embodiment of the present invention.

[0017] In the figure: 1-main slider; 2-floating core-pulling block; 3-buckle assembly; 4-hook assembly; 5-movable mold; 6-first spring; 7-fixed mold; 8-hook fixing block; 9-hook; 10-second spring; 11-top pressure cover plate; 12-connecting pin; 13-block; 14-first guide slope; 15-first hook surface; 16-second guide slope; 17-second hook surface; 18-third guide slope; 19-fourth guide slope; 20-first side slider; 21-second side slider; 22-driving mechanism; 23-first core-pulling bent pin; 24-second core-pulling bent pin; 25-fixing screw; 26-mounting screw; 27-connecting screw. DETAILED DESCRIPTION

[0018] like Figure 1-Figure 8 As shown, this embodiment provides a slider core-pulling mechanism, which is applied to a three-sided core-pulling injection mold. The slider core-pulling mechanism includes a main slider 1, a floating core-pulling block 2, a buckle assembly 3, and an openable and closable hook assembly 4. The main slider 1 is slidably arranged on a movable mold 5 of the injection mold. The main slider 1 is provided with an upper limit slide groove and a lower limit slide groove along the mold opening direction, and the floating core-pulling block 2 is slidably arranged in the lower limit slide groove. The floating core-pulling block 2 slides downward and extends into the mold cavity, which is convenient for product injection molding. The floating core-pulling block 2 slides upward and enters the lower limit slide groove, which is convenient for the floating core-pulling block 2 to move with the main slider 1, which is beneficial for product demoulding.

[0019] The buckle assembly 3 is slidably arranged in the upper limit slide groove, and the buckle assembly 3 is connected to the floating core pulling block 2, and a first spring 6 is arranged between the buckle assembly 3 or the floating core pulling block 2 and the main slider 1. The first spring 6 can be arranged between the buckle assembly 3 and the main slider 1, and can also be arranged between the floating core pulling block 2 and the main slider 1, so that the floating core pulling block 2 is kept in the lower limit slide groove.

[0020] The hook assembly 4 is arranged on the fixed mold 7 of the injection mold. When the fixed mold 7 and the movable mold 5 of the injection mold are closed, the hook assembly 4 presses the buckle assembly 3 to make the floating core pulling block 2 extend out of the lower limit slide groove, and the hook assembly 4 gradually closes and completes the buckling action with the buckle assembly 3; when the fixed mold 7 and the movable mold 5 of the injection mold are opened, the hook assembly 4 extends into the lower limit slide groove with the floating core pulling block 2 through the buckle assembly 3, and the hook assembly 4 gradually opens and completes the separation action with the buckle assembly 3.

[0021] In view of the technical difficulties and technical risks existing in the prior art, the present invention studies and designs a novel slider core-pulling mechanism, which can realize the following functions: 1) the mold action is completed by reasonable mechanism movement, ensuring the smooth action of the mold mechanism; 2) avoiding the spring parts working under a large compression state, reducing the working load of the spring parts, and avoiding fatigue damage of the spring parts; 3) the mechanism action is single, no other auxiliary mechanisms are required, and the mechanism operation is safe and reliable; 4) it can realize efficient automated injection molding production.

[0022] like Figure 1 As shown, specifically, the hook assembly 4 includes a hook fixing block 8, a hook 9, a second spring 10 and a top pressure cover plate 11. The hook fixing block 8 is fixed to the fixed mold 7 by a fixing screw 25. Two hooks 9 are rotatably arranged on the hook fixing block 8. A second spring 10 is arranged between the two hooks 9. The top pressure cover plate 11 is arranged at the bottom of the hook fixing block 8. The top pressure cover plate 11 is used to press the buckle assembly 3 to deform the first spring 6. A limited position channel is provided on the hook fixing block 8. The hook 9 is rotatably arranged in the limited position channel by a connecting pin 12. The two hooks 9 are arranged relatively to each other, and the two hooks 9 can rotate within a certain angle range to achieve the snap-on and separation actions with the buckle assembly 3.

[0023] The side wall of the hook 9 is provided with a fixing groove, and the two ends of the second spring 10 are respectively clamped in the fixing grooves of the side walls of the two hooks 9. The bottom of the hook fixing block 8 is provided with an open groove, and the inner wall of the open groove is provided with a mounting groove adapted to the second spring 10. The top pressure cover plate 11 is fixed in the open groove by mounting screws 26, which facilitates the assembly and maintenance of the second spring 10.

[0024] Specifically, the buckle assembly 3 includes a clamping block 13 and a connecting piece, the clamping block 13 is connected to the floating core-pulling block 2 through the connecting piece, the clamping block 13 is slidably arranged in the upper limit slide groove, and the clamping block 13 is provided with a clamping groove adapted to the hook 9. The connecting piece adopts a connecting screw 27, and the connecting screw 27 connects the clamping block 13 and the floating core-pulling block 2 together. The hook 9 can be extended into the clamping groove to realize the buckling of the hook assembly 4 and the buckle assembly 3.

[0025] like Figure 3As shown, the side wall of the clamping block 13 is provided with a first guide slope 14 and a first hook surface 15 connected at an angle, and the inner side of the hook 9 is provided with a second guide slope 16 and a second hook surface 17 connected at an angle, the first guide slope 14 and the second guide slope 16 match each other, and the first hook surface 15 and the second hook surface 17 match each other, so that the hook 9 and the clamping block 13 are interlocked. The side wall of the upper limit slide groove is provided with a third guide slope 18, and the third guide slope 18 is arranged opposite to the first guide slope 14 to guide the hook 9 into the clamping groove. The outer side of the hook 9 is provided with a fourth guide slope 19, and the fourth guide slope 19 matches the third guide slope 18.

[0026] Preferably, the first spring 6 is arranged in the upper limit slide groove and abuts against the block 13. In the initial state, the first spring 6 applies an upward force to the block 13, so that the top of the block 13 protrudes out of the upper limit slide groove. When the top pressure cover plate 11 applies pressure to the block 13, the first spring 6 is compressed and the block 13 moves downward.

[0027] The present invention adopts an independent split component design, and the main innovative structure lies in the buckle component 3 and the hook component 4. When in use, the hook component 4 is placed in the cavity on the side of the fixed mold 7, fixed to the side of the fixed mold 7 by the fixing screw 25, and the buckle component and the floating core block 2 are fixed by the connecting screw 27. Therefore, the motion sequence control function of the mechanism of the present invention can be realized in the mold opening and closing actions during the mold injection production process.

[0028] In a case product, there is an undercut feature in the core pulling direction of the main slider 1, and the depth of the undercut feature is 2.2mm. Before the mold starts to pull the core, the undercut feature needs to complete the floating core pulling action. Through analysis and calculation, the core pulling distance of the built-in lifting core pulling is designed to be 3.0mm. The hook 9 and the main slider 1 are designed to have a 2.6mm straight face match to ensure that the undercut feature of the product can be completely pulled out during the opening process of the mold, thereby achieving the smooth progress of the injection molding production of the mold.

[0029] like Figure 2 and Figure 3 As shown, the movement process of the slider core-pulling mechanism in the present invention is divided into two actions: engagement and separation, which will be realized during the mold closing and mold opening processes.

[0030] 1. Snap-on action. When the mold is closed, the two hooks 9 of the hook assembly 4 are in an open state under the action of the second spring 10. As the mold closing action proceeds, first, the top pressure cover plate 11 on the hook assembly 4 contacts the block 13 in the buckle assembly 3, forcing the first spring 6 to be compressed. The block 13 simultaneously drives the floating core block 2 downward into the cavity. In this process, the fourth guide slope 19 on the outside of the hook 9 fits with the third guide slope 18 on the side wall of the upper limit slide groove, and under the action of the lateral mold closing force, the hook 9 is brought inward and then enters the groove of the block 13. Then the hook 9 continues to move down 2.6 mm along the vertical side of the main slide block 1, thereby realizing the snap-on action of the hook 9 and the block 13.

[0031] 2. Separation action. After the mold completes injection molding, the mold begins to open. When the mold opens 0.3mm, the second hook surface 17 of the hook 9 contacts the first hook surface 15 of the block 13. As the mold opening action continues, the hook 9 pulls the buckle and the floating core-pulling block 2 together to perform floating core-pulling action while maintaining the straight side of the main slider 1. When the mold moves to 2.6mm, the floating core-pulling block 2 has completed the floating core-pulling requirement, and the hook 9 also begins to open outward under the action of the second spring 10. The second guide slope 16 on the inner side of the hook 9 cooperates with the first guide slope 14 of the block 13 to make the block 13 and the floating core-pulling block 2 continue to float 0.4mm, and maintain the core-pulling state under the support of the first spring 6. As the mold continues to open, the hook 9 is completely separated from the block 13 after being fully opened by the second spring 10. At this point, the separation action of the hook 9 and the buckle block ends, and the mold enters the subsequent production process action.

[0032] Compared with the prior art, the present invention has the following characteristics: 1. The buckle assembly 3 and the hook assembly 4 designed by the present invention have strong structural versatility and can be used as a standard part for batch processing; 2. Through the mechanical connection of mold parts, change the driving connection mode of such mold mechanism to ensure smooth movement of the mold movement mechanism; 3. Solve the high-load working state of spring parts, avoid premature fatigue damage of spring parts, and extend the service life of spring parts; 4. The structure of the clamping block 13 and the hook 9 is designed so that the moving parts of the mold are completed through the cooperation of related parts. The spring in the whole mechanism only needs to provide a small holding force without too much compression force; 5. The designed block 13 and hook 9 have simple structure, stable and reliable mechanism movement, and do not affect the mold design space; 6. The designed block 13 and hook 9 have reliable structural positioning, which prolongs the service life of the mold and improves the production stability of the mold; 7. All parts of the present invention are machined, the manufacturing difficulty and cost are not high, and the parts are of high precision and strong interchangeability; 8. Precision parts assembly reduces movement wear of the mechanism and reduces production and maintenance costs of the mold.

[0033] like Figure 5-Figure 8 As shown, this embodiment also provides a three-side core-pulling injection mold, including the above-mentioned slider core-pulling mechanism, and also includes a fixed mold 7, a movable mold 5, a first side slider 20, a second side slider 21 and a driving mechanism 22. The first side slider 20 and the second side slider 21 are respectively arranged on both sides of the main slider 1. The fixed mold 7 is provided with a first core-pulling bent pin 23 and a second core-pulling bent pin 24. The first core-pulling bent pin 23 is inserted on the first side slider 20, and the second core-pulling bent pin 24 is inserted on the second side slider 21. The output end of the driving mechanism 22 is connected to the main slider 1. The driving mechanism 22 adopts a driving oil cylinder, and the driving oil cylinder drives the main slider 1 to carry the floating core-pulling block 2 out of the mold cavity, the first core-pulling bent pin 23 drives the first side slider 20 out of the mold cavity, and the second core-pulling bent pin 24 drives the second side slider 21 out of the mold cavity, and then the ejector is used to eject the product to realize the product demolding function.

[0034] The present invention proposes a new mold design concept, which enables plastic products to be quickly, stably and high-quality injection molded, and the entire product injection molding process has a high degree of automation. The product injection molding is in a controllable operation process from the production process, mold movement mechanism, injection molding production process, etc., so that the product injection molding production and molding can achieve high-efficiency, high-quality and high-stability automated production, and the product manufacturing production cost is greatly reduced.

[0035] In the description of the present invention, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, and may be fixedly connected, detachably connected, or integrated; may be mechanically connected or electrically connected; may be directly connected or indirectly connected through an intermediate medium, may be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood. In addition, the specific features, structures, etc. described in the embodiments are included in at least one embodiment. Under the condition that there is no contradiction, those skilled in the art may combine the features of different embodiments. The protection scope of the present invention is not limited to the above-mentioned specific embodiments. According to the basic technical concept of the present invention, the embodiments that can be associated with by ordinary technicians in this field without creative work all belong to the protection scope of the present invention.

Claims

1. A slider core pulling mechanism, characterized in that: The invention comprises a main slider (1), a floating core pulling block (2), a buckle assembly (3) and an openable and closable hook assembly (4), wherein the main slider (1) is slidably arranged on a movable mold (5) of an injection mold, the main slider (1) is provided with an upper limit slide groove and a lower limit slide groove along the mold opening direction, and the floating core pulling block (2) is slidably arranged in the lower limit slide groove; the buckle assembly (3) is slidably arranged in the upper limit slide groove, and the buckle assembly (3) is connected to the floating core pulling block (2), and a first spring (6) is provided between the buckle assembly (3) or the floating core pulling block (2) and the main slider (1). The hook assembly (4) is arranged on the fixed mold (7) of the injection mold. When the fixed mold (7) and the movable mold (5) of the injection mold are closed, the hook assembly (4) presses the buckle assembly (3) to make the floating core-pulling block (2) extend out of the lower limit slot, and the hook assembly (4) gradually closes and completes the buckle action with the buckle assembly (3); when the fixed mold (7) and the movable mold (5) of the injection mold are opened, the hook assembly (4) extends into the lower limit slot with the floating core-pulling block (2) through the buckle assembly (3), and the hook assembly (4) gradually opens and completes the separation action with the buckle assembly (3).

2. The slider core-pulling mechanism according to claim 1, characterized in that: The hook assembly (4) comprises a hook fixing block (8), a hook (9), a second spring (10) and a pressing cover plate (11); two hooks (9) are rotatably arranged on the hook fixing block (8); the second spring (10) is arranged between the two hooks (9); the pressing cover plate (11) is arranged at the bottom of the hook fixing block (8); the pressing cover plate (11) is used to press the buckle assembly (3) to deform the first spring (6).

3. The slider core-pulling mechanism according to claim 2, characterized in that: The draw hook fixing block (8) is provided with a limit passage, and the draw hook (9) is rotatably arranged in the limit passage via a connecting pin (12).

4. The slider core-pulling mechanism according to claim 3, characterized in that: The side wall of the draw hook (9) is provided with a fixing groove, and the two ends of the second spring (10) are respectively clamped in the fixing grooves of the side walls of the two draw hooks (9).

5. The slider core-pulling mechanism according to claim 2, characterized in that: An open slot is provided at the bottom of the draw hook fixing block (8), a mounting slot adapted to the second spring (10) is provided on the inner wall of the open slot, and the top pressure cover plate (11) is fixed in the open slot by bolts.

6. The slider core-pulling mechanism according to claim 2, characterized in that: The buckle assembly (3) comprises a clamping block (13) and a connecting piece, wherein the clamping block (13) is connected to the floating core-pulling block (2) via the connecting piece, the clamping block (13) is slidably disposed in the upper limit sliding groove, and the clamping block (13) is provided with a clamping groove adapted to the draw hook (9).

7. The slider core-pulling mechanism according to claim 6, characterized in that: The side wall of the clamping block (13) is provided with a first guiding inclined surface (14) and a first hook surface (15) connected at an angle, and the inner side of the pull hook (9) is provided with a second guiding inclined surface (16) and a second hook surface (17) connected at an angle, the first guiding inclined surface (14) and the second guiding inclined surface (16) match each other, and the first hook surface (15) and the second hook surface (17) match each other.

8. The slider core-pulling mechanism according to claim 7, characterized in that: A third guiding bevel (18) is provided on the side wall of the upper limit sliding groove, and the third guiding bevel (18) is arranged opposite to the first guiding bevel (14). A fourth guiding bevel (19) is provided on the outer side of the draw hook (9), and the fourth guiding bevel (19) matches the third guiding bevel (18).

9. The slider core-pulling mechanism according to claim 1, characterized in that: The first spring (6) is arranged in the upper limit sliding groove and abuts against the clamping block (13).

10. A three-sided core-pulling injection mold, characterized in that: The invention comprises a slider core-pulling mechanism as claimed in any one of claims 1 to 9, and further comprises a fixed mold (7), a movable mold (5), a first side slider (20), a second side slider (21) and a driving mechanism (22), wherein the first side slider (20) and the second side slider (21) are respectively arranged on both sides of the main slider (1), and the fixed mold (7) is provided with a first core-pulling bent pin (23) and a second core-pulling bent pin (24), the first core-pulling bent pin (23) is inserted on the first side slider (20), and the second core-pulling bent pin (24) is inserted on the second side slider (21), and the output end of the driving mechanism (22) is connected to the main slider (1).

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