Direct-pulling-driven arc core-pulling mechanism and core-pulling method

Abstract

The invention relates to a straight-pulling driven arc core-pulling mechanism and a core-pulling method. The straight-pulling driven arc core-pulling mechanism comprises a fixed insert and a mounting block, the upper surface of the fixed insert is detachably connected with a forming insert and a mounting groove; a profiling movable groove is formed in the upper surface of the fixed insert; an injection molding runner, a movable insert and an arc-shaped core-pulling groove are arranged on the forming insert; a first core-pulling sliding block and a first profiling groove are arranged in the profiling movable groove, a drawing groove is formed in the lower surface of the fixed insert, a second core-pulling sliding block is arranged in the drawing groove in a drawing and sliding mode, an insert pin is transversely arranged on the second core-pulling sliding block in a sliding mode, and an arc-shaped second profiling groove is formed in the bottom of the first profiling groove. The insert pin penetrates through the second profiling groove and is connected with the first core-pulling sliding block; a driving mechanism is fixed on the mounting block; the precision and the stability of arc core pulling can be guaranteed, and meanwhile the overall size is very compact; more importantly, the core-pulling structure design has very high adaptability, and the development period of the mold of this type can be greatly shortened.

Description

TECHNICAL FIELD

[0001] The present application relates to injection mold technical field, more particularly, to a straight extraction driving arc core-pulling mechanism and core-pulling method. BACKGROUND

[0002] In the injection mold, the core-pulling of the arc reverse buckle position on the product needs to use the arc core-pulling structure. In the existing design, the arc core-pulling mechanism of the injection mold with the application number 201320505068.6 realizes the arc core-pulling through the gear and rack linkage, which has a complex structure. At the same time, the linkage components need to be close to the mold, so the spatial structure design of the mold is difficult. The four-cavity large-arc guiding rotary arc extraction mechanism with the application number CN201520443968.1 realizes linkage through the transmission connecting rod, which can avoid the defect. However, the transmission connecting rod has a relatively low transmission precision because of the activity gap of the rotating shaft, which is difficult to be applied to the product processing with high precision requirements. Moreover, the existing arc core-pulling mechanism often needs to configure multiple sets of core-pulling mechanisms when facing some multi-directional and different rotary arc product processing, which is obviously not satisfactory. Therefore, a straight extraction driving arc core-pulling mechanism and core-pulling method which can solve the above series of difficulties is needed. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a straight extraction driving arc core-pulling mechanism and core-pulling method in view of the above defects of the prior art.

[0004] The technical scheme adopted by the present application to solve the technical problem is: The invention discloses a straight pulling circular arc core pulling mechanism, which comprises a fixed insert arranged in an injection mold and a mounting block arranged outside the injection mold; the mounting block is detachably connected with the outer surface of the fixed insert; the upper surface of the fixed insert is detachably connected with a forming insert and a mounting groove matched with the forming insert; the upper surface of the fixed insert is provided with a profiled movable groove, which is communicated with the mounting groove and the outer surface of the fixed insert; the forming insert is provided with an injection runner for arc reverse-docking forming of a product, a movable insert matched with the injection runner for arc reverse-docking forming, and an arc core-pulling groove for movement of the movable insert; the profiled movable groove is provided with a first core-pulling slider for moving the movable insert and an arc-shaped first profiled groove matched with the first core-pulling slider; the lower surface of the fixed insert is provided with a pulling groove longitudinally opposite to the profiled movable groove; the pulling groove is slidably provided with a second core-pulling slider; the second core-pulling slider is slidably provided with a pin transversely; the bottom of the first profiled groove is provided with an arc-shaped second profiled groove; the pin passes through the second profiled groove and is connected with the first core-pulling slider; and the mounting block is fixed with a driving mechanism for pulling the second core-pulling slider.

[0005] The invention discloses a straight pulling circular arc core pulling mechanism, which comprises a fixed insert arranged in an injection mold and a mounting block arranged outside the injection mold; the mounting block is detachably connected with the outer surface of the fixed insert; the upper surface of the fixed insert is detachably connected with a forming insert and a mounting groove matched with the forming insert; the upper surface of the fixed insert is provided with a profiled movable groove, which is communicated with the mounting groove and the outer surface of the fixed insert; the forming insert is provided with an injection runner for arc reverse-docking forming of a product, a movable insert matched with the injection runner for arc reverse-docking forming, and an arc core-pulling groove for movement of the movable insert; the profiled movable groove is provided with a first core-pulling slider for moving the movable insert and an arc-shaped first profiled groove matched with the first core-pulling slider; the lower surface of the fixed insert is provided with a pulling groove longitudinally opposite to the profiled movable groove; the pulling groove is slidably provided with a second core-pulling slider; the second core-pulling slider is slidably provided with a pin transversely; the bottom of the first profiled groove is provided with an arc-shaped second profiled groove; the pin passes through the second profiled groove and is connected with the first core-pulling slider; and the mounting block is fixed with a driving mechanism for pulling the second core-pulling slider.

[0006] The invention discloses a straight pulling circular arc core pulling mechanism, which comprises a fixed insert arranged in an injection mold and a mounting block arranged outside the injection mold; the mounting block is detachably connected with the outer surface of the fixed insert; the upper surface of the fixed insert is detachably connected with a forming insert and a mounting groove matched with the forming insert; the upper surface of the fixed insert is provided with a profiled movable groove, which is communicated with the mounting groove and the outer surface of the fixed insert; the forming insert is provided with an injection runner for arc reverse-docking forming of a product, a movable insert matched with the injection runner for arc reverse-docking forming, and an arc core-pulling groove for movement of the movable insert; the profiled movable groove is provided with a first core-pulling slider for moving the movable insert and an arc-shaped first profiled groove matched with the first core-pulling slider; the lower surface of the fixed insert is provided with a pulling groove longitudinally opposite to the profiled movable groove; the pulling groove is slidably provided with a second core-pulling slider; the second core-pulling slider is slidably provided with a pin transversely; the bottom of the first profiled groove is provided with an arc-shaped second profiled groove; the pin passes through the second profiled groove and is connected with the first core-pulling slider; and the mounting block is fixed with a driving mechanism for pulling the second core-pulling slider.

[0007] The invention discloses a straight pulling circular arc core pulling mechanism, which comprises a fixed insert arranged in an injection mold and a mounting block arranged outside the injection mold; the mounting block is detachably connected with the outer surface of the fixed insert; the upper surface of the fixed insert is detachably connected with a forming insert and a mounting groove matched with the forming insert; the upper surface of the fixed insert is provided with a profiled movable groove, which is communicated with the mounting groove and the outer surface of the fixed insert; the forming insert is provided with an injection runner for arc reverse-docking forming of a product, a movable insert matched with the injection runner for arc reverse-docking forming, and an arc core-pulling groove for movement of the movable insert; the profiled movable groove is provided with a first core-pulling slider for moving the movable insert and an arc-shaped first profiled groove matched with the first core-pulling slider; the lower surface of the fixed insert is provided with a pulling groove longitudinally opposite to the profiled movable groove; the pulling groove is slidably provided with a second core-pulling slider; the second core-pulling slider is slidably provided with a pin transversely; the bottom of the first profiled groove is provided with an arc-shaped second profiled groove; the pin passes through the second profiled groove and is connected with the first core-pulling slider; and the mounting block is fixed with a driving mechanism for pulling the second core-pulling slider.

[0008] The invention discloses a straight pulling circular arc core pulling mechanism, which comprises a fixed insert arranged in an injection mold and a mounting block arranged outside the injection mold; the mounting block is detachably connected with the outer surface of the fixed insert; the upper surface of the fixed insert is detachably connected with a forming insert and a mounting groove matched with the forming insert; the upper surface of the fixed insert is provided with a profiled movable groove, which is communicated with the mounting groove and the outer surface of the fixed insert; the forming insert is provided with an injection runner for arc reverse-docking forming of a product, a movable insert matched with the injection runner for arc reverse-docking forming, and an arc core-pulling groove for movement of the movable insert; the profiled movable groove is provided with a first core-pulling slider for moving the movable insert and an arc-shaped first profiled groove matched with the first core-pulling slider; the lower surface of the fixed insert is provided with a pulling groove longitudinally opposite to the profiled movable groove; the pulling groove is slidably provided with a second core-pulling slider; the second core-pulling slider is slidably provided with a pin transversely; the bottom of the first profiled groove is provided with an arc-shaped second profiled groove; the pin passes through the second profiled groove and is connected with the first core-pulling slider; and the mounting block is fixed with a driving mechanism for pulling the second core-pulling slider.

[0009] The straight-pull-driven arc-shaped core-pulling mechanism of the present invention comprises an injection molding channel, a movable insert, an arc-shaped core-pulling groove, a first core-pulling slider, a contouring movable groove, an insert pin, and a second contouring groove forming a unit, and multiple units are provided on the mechanism.

[0010] The straight-pull-driven arc-shaped core-pulling mechanism of the present invention includes a limiting groove on the side surface of the mounting block facing the fixed insert for limiting the second core-pulling slider.

[0011] A method for pulling a core along a straight arc, employing the aforementioned mechanism, wherein the method includes: Mold design: The position and size of the fixed insert are determined according to the undercut position and quantity of the product. A molded insert and a mounting groove that mates with the molded insert are set on the fixed insert. An injection runner for forming the arc-shaped undercut of the product, a movable insert for forming the arc-shaped undercut that mates with the injection runner, and an arc-shaped core-pulling groove for moving the movable insert to pull the core are set on the molded insert. A contouring movable groove is set on the upper surface of the fixed insert. A first core-pulling slider and a first contouring groove are set in the contouring movable groove. A pull-out groove is set on the lower surface of the fixed insert. A second core-pulling slider is slidably pulled out in the pull-out groove. An insert pin is slidably set on the second core-pulling slider. An arc-shaped second contouring groove is set at the bottom of the first contouring groove. The insert pin passes through the second contouring groove and connects to the first core-pulling slider. A drive mechanism for pulling the second core-pulling slider is fixed on the mounting block. Mold application: After the mold is closed, the plastic solution enters the movable insert through the injection channel. After injection molding is completed and cooled, the drive mechanism drives the second core-pulling slider to move outward. The second core-pulling slider drives the first core-pulling slider to move along the arc of the first contour groove through the adaptive lateral swinging insert pin. The first core-pulling slider drives the movable insert to move along the arc-shaped core-pulling groove to complete the arc core pulling.

[0012] The beneficial effects of this invention are as follows: Using the method described in this application, after the mold is closed, the plastic solution enters the movable insert through the injection channel. After injection molding and cooling, the drive mechanism drives the second core-pulling slider to move outward. The second core-pulling slider, through an adaptive laterally swinging insert pin, drives the first core-pulling slider to move arc-shaped along the first contour groove. The first core-pulling slider drives the movable insert to move along the arc-shaped core-pulling groove to complete the arc-shaped core pulling. This not only ensures the accuracy and stability of the arc-shaped core pulling but also results in a very compact overall size. More importantly, this core-pulling structure design has strong adaptability. Based on the above mold design method, multi-directional, multi-rotational arc-shaped core pulling designs for products under single drive can be quickly completed, significantly shortening the development cycle of this type of mold and bringing benefits to enterprises. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort: Figure 1 This is a schematic diagram of the direct-pull-driven arc-shaped core-pulling mechanism of a preferred embodiment of the present invention; Figure 2 This is an exploded view from the first perspective of the direct-pull-driven arc-shaped core-pulling mechanism of a preferred embodiment of the present invention; Figure 3 This is an exploded view from a second perspective of the direct-pull-driven arc-shaped core-pulling mechanism of a preferred embodiment of the present invention; Figure 4 This is an exploded view from a third perspective of the straight-pull-driven arc-shaped core-pulling mechanism of a preferred embodiment of the present invention (with the first contour block hidden). Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0015] The preferred embodiment of the present invention is a direct-pull driven arc-shaped core-pulling mechanism, such as... Figure 1 As shown, see also Figures 2-4The system includes a fixed insert 1 disposed within the injection mold and a mounting block 2 located outside the injection mold; the mounting block 2 is detachably connected to the outer surface of the fixed insert 1; a molding insert 3 and a mounting groove 10 cooperating with the molding insert 3 are detachably connected to the upper surface of the fixed insert 1; a contoured movable groove 11 is provided on the upper surface of the fixed insert 1, the contoured movable groove 11 connecting the mounting groove 10 and the outer surface of the fixed insert 1; the molding insert 3 is provided with an injection runner 30 for arc-shaped undercut molding of the product, a movable insert 31 cooperating with the injection runner 30 for arc-shaped undercut molding, and an arc-shaped core-pulling groove for the movable insert 31 to move and pull the core. 32; The contouring movable groove 11 is provided with a first core-pulling slider 12 that drives the movable insert 31 to move and pull the core, and an arc-shaped first contouring groove 13 that cooperates with the first core-pulling slider 12. The lower surface of the fixed insert 1 is provided with a pull-out groove 14 that is longitudinally opposite to the contouring movable groove 11. A second core-pulling slider 15 is slidably pulled out in the pull-out groove 14. A pin 16 is slidably arranged on the second core-pulling slider 15. An arc-shaped second contouring groove 17 is provided at the bottom of the first contouring groove 13. The pin 16 passes through the second contouring groove 17 and is connected to the first core-pulling slider 12. A drive mechanism 4 for pulling the second core-pulling slider 15 is fixed on the mounting block 2. Using the method of this application, after the mold is closed, the plastic solution enters the movable insert 31 through the injection channel 30. After injection molding and cooling, the drive mechanism 4 drives the second core-pulling slider 15 to move outward. The second core-pulling slider 15 drives the first core-pulling slider 12 to move arc-shaped along the first contour groove 13 through the adaptive laterally swinging insert pin 16. The first core-pulling slider 12 drives the movable insert 31 to move along the arc-shaped core-pulling groove 32 to complete the arc-shaped core pulling. This not only ensures the accuracy and stability of the arc-shaped core pulling, but also makes the overall volume very compact. More importantly, this core-pulling structure design has a very strong adaptability. According to the above mold design method, the design of multi-directional, different rotational arc-shaped product under single drive can be completed quickly. It can also significantly shorten the development cycle of this type of mold and bring benefits to enterprises.

[0016] Preferably, the movable insert 31 includes a forming bend 310, one end of which is connected to the first core-pulling slider 12. The interior of the forming bend 310 near the first core-pulling slider 12 has a forming hole for forming an arc-shaped undercut of the product, and the side surface has a core-pulling separation groove 311 communicating with the forming hole. The injection molding channel 30 is connected to the core-pulling separation groove 311. During injection molding, the plastic solution enters the forming hole 311 within the movable insert 31 through the injection molding channel 30, cooling and forming the arc-shaped undercut of the product. During core pulling, the first core-pulling slider 12 pulls the end of the forming bend 310 near the first core-pulling slider 12, causing the arc-shaped undercut of the product to move relative to the core-pulling separation groove 311, completing the core pulling. The structure is simple, and the core pulling reliability is good. It is understandable that the movable insert 31 can be designed accordingly based on different actual products, without needing to replace the entire mold. This modular and replaceable design is also a highlight of the core-pulling structure of this application.

[0017] Preferably, a connecting block 312 is fixed to one end of the formed bent tube 310, and a fixing groove 121 that cooperates with the connecting block 312 is provided on the first core-pulling slider 12; a positioning protrusion is provided on the side of the connecting block 312, and a positioning slot that cooperates with the positioning protrusion is provided on the inner wall of the fixing groove. The structure is simple and easy to disassemble and assemble.

[0018] Preferably, the contouring movable groove 11 is provided with a first contouring block 110 and a second contouring block 111. The first contouring block 110, the second contouring block 111, and the inner bottom surface of the contouring movable groove 11 enclose and form an arc-shaped first contouring groove 13 that cooperates with the first core-pulling slider 12. An arc-shaped positioning groove 1100 is provided on the opposite side surface of the first contouring block 110 and the second contouring block 111. Arc-shaped protrusions 120 that cooperate with the arc-shaped positioning grooves are provided on both sides of the first core-pulling slider 12. With this structural design, the first contouring groove 13 with different arc curves can be quickly formed by replacing the first contouring block 110 and the second contouring block 111, which provides high flexibility.

[0019] Preferably, the injection molding runner, movable insert, arc-shaped core-pulling groove, first core-pulling slider, contouring movable groove, insert pin, and second contouring groove constitute a unit, and this unit has multiple sets in the mechanism; for example Figure 1 As shown, a two-unit side-by-side design is used. Of course, the design can be tailored to specific needs, and the number is not limited to two sets; there can be more sets, and the more sets there are, the more the advantages of this application can be demonstrated. At the same time, the curvature between each set can be different, and corresponding contour groove designs can be made. The height position between each set can also be different, and the thickness of the corresponding components can be changed.

[0020] Preferably, a limiting groove 20 for limiting the position of the second core-pulling slider 15 is provided on the side surface of the mounting block 2 facing the fixing insert 1. The limiting groove 20 is used to limit the position of the second core-pulling slider 15, so as to facilitate the adjustment of the core-pulling stroke. In summary, the arc-shaped core-pulling mechanism of this application can be flexibly configured and adjusted in multiple dimensions, including the movable insert, the arc of the core-pulling mechanism, the layout of the core-pulling mechanism combination, and the stroke of the core-pulling mechanism, which effectively solves the shortcomings of the current arc-shaped core-pulling mechanism, which is large in size and poor in flexibility.

[0021] A method for pulling a core along a circular arc using a direct pull mechanism, as described above, wherein the method includes: Mold design: The position and size of the fixed insert are determined according to the undercut position and quantity of the product. A molded insert and a mounting groove that mates with the molded insert are set on the fixed insert. An injection runner for forming the arc-shaped undercut of the product, a movable insert for forming the arc-shaped undercut that mates with the injection runner, and an arc-shaped core-pulling groove for moving the movable insert to pull the core are set on the molded insert. A contouring movable groove is set on the upper surface of the fixed insert. A first core-pulling slider and a first contouring groove are set in the contouring movable groove. A pull-out groove is set on the lower surface of the fixed insert. A second core-pulling slider is slidably pulled out in the pull-out groove. An insert pin is slidably set on the second core-pulling slider. An arc-shaped second contouring groove is set at the bottom of the first contouring groove. The insert pin passes through the second contouring groove and connects to the first core-pulling slider. A drive mechanism for pulling the second core-pulling slider is fixed on the mounting block. Mold application: After the mold is closed, the plastic solution enters the movable insert through the injection channel. After injection molding is completed and cooled and formed, the drive mechanism drives the second core-pulling slider to move outward. The second core-pulling slider drives the first core-pulling slider to move along the first contour groove in an arc shape through the adaptive horizontal swinging insert pin. The first core-pulling slider drives the movable insert to move along the arc core-pulling groove to complete the arc core pulling. Using the method of this application, after the mold is closed, the plastic solution enters the movable insert 31 through the injection channel 30. After injection molding and cooling, the drive mechanism 4 drives the second core-pulling slider 15 to move outward. The second core-pulling slider 15 drives the first core-pulling slider 12 to move arc-shaped along the first contour groove 13 through the adaptive laterally swinging insert pin 16. The first core-pulling slider 12 drives the movable insert 31 to move along the arc-shaped core-pulling groove 32 to complete the arc-shaped core pulling. This not only ensures the accuracy and stability of the arc-shaped core pulling, but also makes the overall volume very compact. More importantly, this core-pulling structure design has a very strong adaptability. According to the above mold design method, the design of multi-directional, different rotational arc-shaped product under single drive can be completed quickly. It can also significantly shorten the development cycle of this type of mold and bring benefits to enterprises.

[0022] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A direct-pull mechanism for driving an arc-shaped core, characterized in that, The device includes a fixed insert disposed within an injection mold and a mounting block located outside the injection mold; the mounting block is detachably connected to the outer surface of the fixed insert; a molding insert and a mounting groove cooperating with the molding insert are detachably connected to the upper surface of the fixed insert; a contoured movable groove is provided on the upper surface of the fixed insert, the contoured movable groove connecting the mounting groove and the outer surface of the fixed insert; the molding insert is provided with an injection runner for arc-shaped undercut molding of the product, a movable insert cooperating with the injection runner for arc-shaped undercut molding, and an arc-shaped core-pulling mechanism for moving the movable insert. The core-pulling groove includes a first core-pulling slider that moves the movable insert to pull the core, and an arc-shaped first contouring groove that cooperates with the first core-pulling slider. The lower surface of the fixed insert has a pull-out groove that is longitudinally aligned with the contouring movable groove. A second core-pulling slider is slidably pulled out within the pull-out groove. A pin is slidably mounted on the second core-pulling slider. An arc-shaped second contouring groove is provided at the bottom of the first contouring groove. The pin passes through the second contouring groove and is connected to the first core-pulling slider. A drive mechanism for pulling the second core-pulling slider is fixed on the mounting block.

2. The direct-pull-driven arc-shaped core-pulling mechanism according to claim 1, characterized in that, The movable insert includes a molded bent tube, one end of which is connected to the first core-pulling slider; the interior of the molded bent tube near the first core-pulling slider is provided with a molding hole for the molded product's arc-shaped inverted shape, and the side surface is provided with a core-pulling separation groove that communicates with the molding hole; the injection molding channel is connected to the core-pulling separation groove.

3. The direct-pull-driven arc-shaped core-pulling mechanism according to claim 2, characterized in that, One end of the formed bent tube is fixed with a connecting block, and the first core-pulling slider is provided with a fixing groove that cooperates with the connecting block; the side of the connecting block is provided with a positioning protrusion, and the inner wall of the fixing groove is provided with a positioning slot that cooperates with the positioning protrusion.

4. The direct-pull-driven arc-shaped core-pulling mechanism according to claim 1, characterized in that, The contouring movable groove is provided with a first contouring block and a second contouring block. The first contouring block, the second contouring block and the inner bottom surface of the contouring movable groove together form an arc-shaped first contouring groove that cooperates with the first core-pulling slider.

5. The direct-pull-driven arc-shaped core-pulling mechanism according to claim 4, characterized in that, The first and second contour blocks each have an arc-shaped positioning groove on one side of their respective surfaces; the first core-pulling slider each has an arc-shaped protrusion on both sides of its surface that mates with the arc-shaped positioning groove.

6. The direct-pull-driven arc-shaped core-pulling mechanism according to claim 4, characterized in that, The injection runner, the movable insert, the arc-shaped core-pulling groove, the first core-pulling slider, the contouring movable groove, the insert pin, and the second contouring groove constitute a unit, and multiple units are provided on the mechanism.

7. The direct-pull-driven arc-shaped core-pulling mechanism according to claim 1, characterized in that, The mounting block has a limiting groove on the side surface facing the fixing insert to limit the second core-pulling slider.

8. A method for pulling a core by direct pulling and driving an arc, using the direct pulling and driving arc core-pulling mechanism as described in any one of claims 1-7, characterized in that, The method includes: Mold design: The position and size of the fixed insert are determined according to the undercut position and quantity of the product. A molded insert and a mounting groove that mates with the molded insert are set on the fixed insert. An injection runner for forming the arc-shaped undercut of the product, a movable insert for forming the arc-shaped undercut that mates with the injection runner, and an arc-shaped core-pulling groove for moving the movable insert to pull the core are set on the molded insert. A contouring movable groove is set on the upper surface of the fixed insert. A first core-pulling slider and a first contouring groove are set in the contouring movable groove. A pull-out groove is set on the lower surface of the fixed insert. A second core-pulling slider is slidably pulled out in the pull-out groove. An insert pin is slidably set on the second core-pulling slider. An arc-shaped second contouring groove is set at the bottom of the first contouring groove. The insert pin passes through the second contouring groove and connects to the first core-pulling slider. A drive mechanism for pulling the second core-pulling slider is fixed on the mounting block. Mold application: After the mold is closed, the plastic solution enters the movable insert through the injection channel. After injection molding is completed and cooled, the drive mechanism drives the second core-pulling slider to move outward. The second core-pulling slider drives the first core-pulling slider to move along the arc of the first contour groove through the adaptive lateral swinging insert pin. The first core-pulling slider drives the movable insert to move along the arc-shaped core-pulling groove to complete the arc core pulling.

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