Rotary core-pulling structure

Abstract

The invention relates to a rotary core-pulling structure which comprises a forming template and a rotary shaft, the rotary shaft is rotatably arranged on the forming template, a driving mechanism is arranged on the forming template, a rotary sliding block is rotatably arranged on the rotary shaft, an arc-shaped through hole is formed in the top surface of the rotary sliding block, and a transmission sliding block sliding in the arc-shaped through hole is fixedly connected to the rotary shaft. A first core-pulling insert is arranged on the rotary sliding block, a second core-pulling insert is arranged on the top face of the first core-pulling insert, the top face of the second core-pulling insert is a sliding inclined face, a third core-pulling insert is arranged on the top face of the second core-pulling insert, and the bottom face of the third core-pulling insert is a core-pulling inclined face matched with the sliding inclined face. A pulling mechanism is arranged on the top face of the first core-pulling insert, an avoiding through hole is formed in the second core-pulling insert, a delay limiting mechanism used for delaying sliding of the rotary sliding block is arranged on the forming mold plate, through two-stage core pulling, the wrapping force between a product and the core-pulling piece is reduced, and the product is prevented from being pulled due to core pulling failure.

Description

Technical Field

[0001] The present invention relates to the field of mold core pulling, and more specifically, to a rotary core pulling structure. Background Art

[0002] An injection mold is a tool for producing plastic products. Specifically, it means that the heat-melted plastic is injected into the product cavity of the injection mold by a high pressure of an injection molding machine, and after cooling and solidifying, a molded product is obtained.

[0003] When an injection mold forms some products with a bent pipe structure, a rotary core pulling structure is often used. However, in the current rotary core pulling structure during use, the bent pipe structure in the product is relatively long, resulting in a large contact area between the product and the core pulling part. Often, due to the tight fit and excessive clamping force between the core pulling part and the product, it is easy to get stuck, leading to core pulling failure and damage to the product. Summary of the Invention

[0004] In view of the above-mentioned defects of the prior art, a rotary core pulling structure is provided.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a rotary core pulling structure, including a forming template and a rotating shaft. The rotating shaft is rotatably arranged on the forming template, and a driving mechanism for driving the rotating shaft to rotate is arranged on the forming template. A rotating slider is rotatably arranged on the rotating shaft. An arc-shaped through hole is arranged on the top surface of the rotating slider. A transmission slider that slides in the arc-shaped through hole is fixedly connected to the rotating shaft. A first core pulling insert is arranged on the rotating slider. A second core pulling insert connected to the transmission slider is arranged on the top surface of the first core pulling insert. The top surface of the second core pulling insert is a sliding inclined surface. One end of the sliding inclined surface away from the transmission slider is lower than the end of the sliding inclined surface connected to the transmission slider. A third core pulling insert that is limited to slide up and down on the rotating slider is arranged on the top surface of the second core pulling insert. The bottom surface of the third core pulling insert is a core pulling inclined surface that cooperates with the sliding inclined surface. A pulling mechanism for pulling the third core pulling insert to move downward is arranged on the top surface of the first core pulling insert. An avoidance through hole for avoiding the pulling mechanism is arranged on the second core pulling insert. The first core pulling insert, the second core pulling insert, and the third core pulling insert form an arc-shaped core pulling part. A delay limiting mechanism for delaying the sliding of the rotating slider is arranged on the forming template.

[0006] Preferably, the rotating shaft is rotatably arranged on the top surface of the forming template. A sleeve sleeved on the rotating shaft is fixedly arranged on the top surface of the forming template. The rotating slider is rotatably sleeved on the sleeve. The top end of the rotating shaft passes through the sleeve and is fixedly connected to the transmission slider.

[0007] Preferably, a polygonal insertion groove is provided at the top end of the rotating shaft, a connecting threaded hole is provided at the bottom of the insertion groove, the transmission slider includes a transmission part and a connecting part, the transmission part is slidably matched in the arc-shaped through hole, the second core-pulling insert is connected to the transmission part, a convex block that is matched and inserted into the insertion groove is provided at the bottom end of the connecting part, and a connecting through hole that is coaxial with the connecting threaded hole is provided on the connecting part.

[0008] Preferably, the driving mechanism includes a gear and a driving machine provided on the mold base, the bottom end of the rotating shaft passing through the forming template is connected to the gear, a rack is connected to the output shaft of the driving machine, and the rack meshes with the gear.

[0009] Preferably, the pulling mechanism includes a pulling block and a pulling rod, the pulling block is provided on the top surface of the first core-pulling insert, a cavity is provided inside the pulling block, one end of the pulling rod is provided inside the cavity, a limiting block located inside the cavity is provided on the pulling rod, a spring is provided between the limiting block and the inner top surface of the cavity, and the other end of the pulling rod passes through the avoidance through hole and is connected to the third core-pulling insert.

[0010] Preferably, a sealant groove is provided on the side wall of the rotating slider, a connecting groove is provided at the bottom of the sealant groove, one end of the core-pulling part is matched and inserted into the sealant groove, a connecting block that is matched and inserted into the connecting groove is provided at the end of the core-pulling part inserted into the sealant groove, the connecting block includes a first connecting block and a third connecting block respectively provided on the first core-pulling insert and the third core-pulling insert, the first connecting block is fixedly connected to the connecting groove, the third connecting block is slidably connected to the connecting groove, one end of the second core-pulling insert inserted into the sealant groove penetrates into the arc-shaped through hole and is connected to the transmission slider, and an avoidance sliding groove for avoiding the rotational movement of the second core-pulling insert is provided on the rotating slider.

[0011] Preferably, a first installation threaded hole is provided on the surface of the first connecting block opposite to the connecting groove, a counterbore through hole coaxial with the first installation threaded hole is provided on the inner side wall of the arc-shaped through hole, connecting sliding grooves extending in the up and down direction are provided on both inner side walls of the connecting groove extending in the up and down direction, and connecting block sliders that are respectively slidably matched in the two connecting sliding grooves are provided on the third connecting block.

[0012] Preferably, the delay limiting mechanism includes a positioning bead, the positioning bead is provided on the surface of the forming template opposite to the bottom surface of the rotating slider, and a positioning groove for cooperating with the positioning bead is provided on the bottom surface of the rotating slider.

[0013] Preferably, a slider groove is provided on the side wall of the rotating slider away from the core-pulling part, a slider plate is detachably provided in the slider groove, and the slider plate is not lower than the side surface of the rotating slider where the slider groove is located.

[0014] Preferably, an arc-shaped pressing strip is provided on the forming template, and the pressing strip is used to prevent the rotating slider from shifting under force.

[0015] The beneficial effects of the present invention are as follows: The driving mechanism drives the rotation of the rotating shaft, so that the second core-pulling insert rotates in an arc through the transmission slider for the first-stage core-pulling. At this time, the third core-pulling insert moves downward under the action of the pulling mechanism. After the transmission slider abuts against the inner wall of the arc-shaped through hole away from the first core-pulling insert, the transmission slider drives the rotating slider to rotate, so that the first core-pulling insert, the second core-pulling insert, and the third core-pulling insert start the second-stage core-pulling. By the downward movement of the third core-pulling insert and the first-stage core-pulling of the second core-pulling insert, the clamping force between the product and the core-pulling parts is reduced, avoiding core-pulling failure and scratching the product. Description of the Drawings

[0016] Figure 1 is the overall structural schematic diagram of the embodiment of the present invention;

[0017] Figure 2 is the sectional structural schematic diagram of the embodiment of the present invention;

[0018] Figure 3 is the structural schematic diagram of the rotating slider of the embodiment of the present invention;

[0019] Figure 4 is the structural schematic diagram of the second core-pulling insert of the embodiment of the present invention;

[0020] Figure 5 is the structural schematic diagram of the forming template of the embodiment of the present invention;

[0021] Figure 6 is the structural schematic diagram of the pulling mechanism of the embodiment of the present invention;

[0022] Figure 7 is the structural schematic diagram of the core-pulling part of the embodiment of the present invention;

[0023] Figure 8 is the structural schematic diagram of the rotating shaft of the embodiment of the present invention;

[0024] Figure 9 is the structural schematic diagram of the transmission slider of the embodiment of the present invention.

[0025] Reference numerals: 1 forming template, 10 pressure strip, 2 rotating shaft, 20 insertion groove, 21 connecting threaded hole, 3 rotating slider, 30 arc-shaped through hole, 31 sealant groove, 32 connecting groove, 33 connecting chute, 34 avoidance chute, 35 positioning groove, 4 driving slider, 40 driving part, 41 connecting part, 42 convex block, 43 connecting through hole, 5 first core-pulling insert, 500 first connecting block, 51 second core-pulling insert, 510 avoidance through hole, 52 third core-pulling insert, 520 third connecting block, 521 connecting block slider, 6 pulling block, 60 pulling rod, 61 limiting block, 62 spring, 7 sleeve, 70 gear, 71 drive motor, 72 rack, 8 positioning bead, 9 slider groove, 90 slider plate. Detailed implementation manners

[0026] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are partial embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. In addition, the directional terms mentioned in the present invention, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., are only references to the directions in the attached drawings. The directional terms used are for better and clearer description and understanding of the present invention, rather than indicating or implying the orientation that the present invention must have. Therefore, it cannot be construed as a limitation to the present invention.

[0027] The embodiments of the present invention are as follows Figures 1 to 9As shown in the figure, a rotary core-pulling structure includes a forming template 1 and a rotating shaft 2. The forming template 1 is arranged on the mold base of the mold, and the cavity for forming the product is arranged on the top surface of the forming template 1. An installation groove for installing the core-pulling structure is arranged at the position on the top surface of the forming template 1 to the right of the cavity. The rotating shaft 2 is rotatably arranged on the forming template 1, and the rotating shaft 2 is rotatably arranged on the bottom of the installation groove. A driving mechanism for driving the rotation of the rotating shaft 2 is arranged on the forming template 1. A rotating slider 3 is rotatably arranged on the rotating shaft 2, and the rotating slider 3 slides in the installation groove. An arc-shaped through hole 30 is arranged on the top surface of the rotating slider 3, and the arc-shaped through hole 30 extends along the sliding direction of the rotating slider 3. A transmission slider 4 that slides in the arc-shaped through hole 30 is fixedly connected to the rotating shaft 2, that is, when the rotating shaft 2 rotates, it drives the transmission slider 4 to slide in the arc-shaped through hole 30. A first core-pulling insert 5 is arranged on the rotating slider 3. A second core-pulling insert 51 connected to the transmission slider 4 is arranged on the top surface of the first core-pulling insert 5. The top surface of the second core-pulling insert 51 is a sliding inclined surface. One end of the sliding inclined surface away from the transmission slider 4 is lower than the end of the sliding inclined surface connected to the transmission slider 4. A third core-pulling insert 52 that is limited in lifting and sliding on the rotating slider 3 is arranged on the top surface of the second core-pulling insert 51. The bottom surface of the third core-pulling insert 52 is a core-pulling inclined surface that cooperates with the sliding inclined surface. A pulling mechanism for pulling the third core-pulling insert 52 to move downward is arranged on the top surface of the first core-pulling insert 5. An avoidance through hole 510 for avoiding the pulling mechanism is arranged on the second core-pulling insert 51, and the avoidance through hole 510 is also an arc-shaped structure. The first core-pulling insert 5, the second core-pulling insert 51, and the third core-pulling insert 52 form an arc-shaped core-pulling part, and the core-pulling part is inserted into the cavity to form the product. A delay limiting mechanism for delaying the sliding of the rotating slider 3 is arranged on the forming template 1.

[0028] The driving mechanism drives the rotation of the rotating shaft 2, thereby driving the arc-shaped rotation of the second core-pulling insert 51 through the transmission slider 4 to perform core-pulling in the first stage. At this time, the third core-pulling insert 52 obtains a spacing for downward movement, and the third core-pulling insert 52 moves downward under the action of the pulling mechanism. The delay limiting mechanism makes the rotating slider 3 stationary. After the transmission slider 4 abuts against the inner side wall of the first core-pulling insert 5 away from the arc-shaped through hole 30, the transmission slider 4 drives the rotating slider 3 to rotate, so that the first core-pulling insert 5, the second core-pulling insert 51, and the third core-pulling insert 52 start the second-stage core-pulling. By the downward movement of the third core-pulling insert 52 and the first-stage core-pulling of the second core-pulling insert 51, the contact area between the product and the core-pulling part is reduced, thereby reducing the holding force and avoiding core-pulling failure and damaging the product. During reset, the driving mechanism drives the rotating shaft 2 to rotate in the reverse direction, so that the transmission slider 4 drives the second core-pulling insert 51 to rotate in the reverse direction. At this time, the second core-pulling insert 51 makes the third core-pulling insert 52 move upward and reset through the sliding inclined surface and the core-pulling inclined surface, and then the transmission slider 4 drives the rotating slider 3 to rotate and reset, that is, the rotating slider 3 drives the first core-pulling insert 5 and the third core-pulling insert 52 to reset.

[0029] Further improvements, such as Figure 1 and Figure 2 As shown in, the rotating shaft 2 is rotatably arranged on the top surface of the forming template 1, that is, the rotating shaft 2 is rotatably arranged at the bottom of the installation groove of the forming template 1. A sleeve 7 sleeved on the rotating shaft 2 is fixedly arranged on the top surface of the forming template 1, that is, the sleeve 7 is arranged at the bottom of the installation groove. Preferably, an external thread is arranged on the outer side wall of the bottom end of the sleeve 7, and an internal threaded hole is arranged at the bottom of the installation groove. The sleeve 7 is threadedly connected to the bottom of the installation groove through the external thread. The rotating slider 3 is rotatably sleeved on the sleeve 7. The top end of the rotating shaft 2 passes through the sleeve 7 and is fixedly connected to the transmission slider 4. The sleeve 7 enables the rotation of the rotating shaft 2 not to affect the rotating slider 3.

[0030] Further improvements, such as Figure 2 、 Figure 8 and Figure 9As shown in, the top of the rotating shaft 2 is provided with a polygonal insertion groove 20, and the insertion groove 20 is a square structure. The bottom of the insertion groove 20 is provided with a connecting threaded hole 21. The transmission slider 4 includes a transmission part 40 and a connecting part 41. The transmission part 40 is matched and slidably arranged in the arc through hole 30. The second core-pulling insert 51 is connected to the transmission part 40. Preferably, the second core-pulling insert 51 is provided with an insert threaded hole at one end close to the transmission part 40, and a transmission part through hole coaxial with the insert threaded hole is provided on the transmission part 40. The end of the transmission part 40 through hole away from the second core-pulling insert is provided with a countersunk structure The second core-pulling insert 51 and the transmission part 40 are detachably connected by screws, so as to facilitate the replacement of the damaged second core-pulling insert 51 or the transmission slider 4. The bottom end of the connecting part 41 is provided with a protrusion 42 that matches the insertion groove 20. The protrusion 42 is a rectangular structure. The connecting part 41 is provided with a connecting through hole 43 coaxial with the connecting threaded hole 21. The top of the connecting through hole 43 is provided with a countersunk structure. The transmission slider 4 is threadedly connected to the connecting threaded hole 21 by screws passing through the connecting through hole 43, so as to be fixed on the rotating shaft 2. Through the protrusion 42 and the insertion groove 20, the rotating shaft 2 drives the transmission slider 4 to rotate.

[0031] Further improvements such as Figure 1 and Figure 2 As shown in , the driving mechanism includes a gear 70 and a driving machine 71 arranged on the mold base, the driving machine 71 is a cylinder or an oil cylinder, the rotating shaft 2 passes through the bottom end of the forming template 1 and is connected to the gear 70, preferably, a bearing is arranged between the rotating shaft 2 and the forming template 1, and the bearing is located directly below the sleeve 7, and a rack 72 is connected to the output shaft of the driving machine 71, and the rack 72 is meshed with the gear 70. The driving machine 71 drives the rotating shaft 2 to rotate through the rack 72 and the gear 70, thereby driving the transmission slider 4 to rotate.

[0032] Further improvements such as Figure 4 and Figure 6 As shown in , the pulling mechanism includes a pulling block 6 and a pulling rod 60, the pulling block 6 is arranged on the top surface of the first core pulling insert 5, a cavity is arranged in the pulling block 6, one end of the pulling rod 60 is arranged in the cavity, and a limiting block 61 located in the cavity is arranged on the pulling rod 60, and a spring 62 is arranged between the limiting block 61 and the inner top surface of the cavity. When the product is molded, the spring 62 is in a compressed state, and the other end of the pulling rod 60 passes through the avoidance through hole 510 and is connected to the third core pulling insert 52. During the first stage of core pulling, the spring 62 gives a downward pulling force to the pulling rod 60 through the limiting block 61, thereby pulling the third core pulling insert 52 downward, allowing the third core pulling insert 52 to break away from contact with the product, reducing the contact area between the product and the third core pulling insert 52, thereby reducing the clamping force.

[0033] Further improvements such asFigure 1 , Figure 3 and Figure 7 As shown in Figure 1 , Figure 3 and Figure 7 , a sealant groove 31 is provided on the side wall of the rotating slider 3. The inner side wall of the sealant groove 31 cooperates with the outer side wall of the core-pulling part to seal the glue, preventing burrs from generating on the product. A connecting groove 32 is provided at the bottom of the sealant groove 31. One end of the core-pulling part is inserted into the sealant groove 31 in a matching manner. A connecting block that is inserted into the connecting groove 32 in a matching manner is provided at the end of the core-pulling part inserted into the sealant groove 31. The connecting block includes a first connecting block 500 and a third connecting block 520 that are correspondingly provided on the first core-pulling insert 5 and the third core-pulling insert 52. The first connecting block 500 is fixedly connected to the connecting groove 32, and the third connecting block 520 is slidably connected to the connecting groove 32. Thus, during the first-stage core-pulling, the third core-pulling insert 52 slides downward. One end of the second core-pulling insert 51 inserted into the sealant groove 31 penetrates through the arc-shaped through hole 30 and is connected to the transmission slider 4. An avoidance chute 34 for avoiding the rotational movement of the second core-pulling insert 51 is provided on the rotating slider 3, that is, the avoidance chute 34 is used to avoid the first-stage core-pulling of the second core-pulling insert 51.

[0034] For further improvement, as Figure 3 and Figure 7 As shown in Figure 3 and Figure 7 , a first installation threaded hole is provided on the surface of the first connecting block 500 opposite to the connecting groove 32. A counterbore through hole coaxial with the first installation threaded hole is provided on the inner side wall of the arc-shaped through hole 30. The first core-pulling insert 5 is detachably connected to the rotating slider 3 through the first installation threaded hole and the counterbore through hole. Connecting chutes 33 extending in the up-down direction are provided on both inner side walls of the connecting groove 32 extending in the up-down direction. The two connecting chutes 33 are correspondingly provided on the left and right inner side walls of the connecting groove 32 located above the avoidance chute 34. Connecting block sliders 521 that are respectively slidably arranged in the two connecting chutes are provided on the third connecting block 520.

[0035] For further improvement, as Figure 3 and Figure 5 As shown in Figure 3 and Figure 5 , the delay limiting mechanism includes a positioning bead 8. The positioning bead 8 is provided on the surface of the molding template 1 opposite to the bottom surface of the rotating slider 3, that is, the positioning bead 8 is located at the bottom of the installation groove on the molding template 1. A positioning groove 35 that cooperates with the positioning bead 8 is provided on the bottom surface of the rotating slider 3. Preferably, a plurality of positioning beads 8 are provided. Sufficient force is provided by the plurality of positioning beads 8 for limiting, so that the rotating slider 3 remains stationary during the first-stage core-pulling.

[0036] For further improvement, as Figure 1 and Figure 2As shown in the figure, a slider groove 9 is provided on the side wall of the rotating slider 3 away from the core pulling part, and a slider plate 90 is detachably provided in the slider groove 9. The slider groove 9 is a rectangular structure, and four groove bottom threaded holes are provided at the bottom of the slider groove 9. The four groove bottom threaded holes are respectively located at the four corners of the bottom of the slider groove 9, and four slider plate through holes corresponding to the four groove bottom threaded holes are provided on the slider plate 90. The slider plate 90 is detachably set in the slider groove 9 by screws, groove bottom threaded holes and slider plate through holes. The slider plate 90 is not lower than the side of the slider groove 9 on the rotating slider 3. When the mold is closed, the slider plate 90 abuts against the shovel base, thereby avoiding the pressure generated when molding the product causing the rotating slider 3 to move and mold defective products, and the slider plate 90 that is severely worn can be replaced.

[0037] Further improvements, such as Figure 1 As shown in the figure, an arc-shaped strip 10 is provided on the forming template 1, and the strip 10 is used to prevent the rotating slider 3 from being offset when the force is applied when the rotating slider 3 rotates. Preferably, the strip 10 is composed of a plurality of auxiliary strips. After the arc-shaped strip 10 is divided into a plurality of auxiliary strips, the curvature of the auxiliary strip is simpler, so that the auxiliary strip is easier to process. At the same time, when a certain auxiliary strip is worn, only the corresponding auxiliary strip needs to be disassembled for repair or replacement, and there is no need to replace the entire strip 10, thereby reducing the maintenance cost.

[0038] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A rotary core-pulling structure, comprising a forming template and a rotating shaft; characterized in that: The rotating shaft is rotatably arranged on the forming template; a driving mechanism for driving the rotating shaft to rotate is arranged on the forming template; a rotating slider is rotatably arranged on the rotating shaft; an arc-shaped through hole is arranged on the top surface of the rotating slider; a transmission slider sliding in the arc-shaped through hole is fixedly connected to the rotating shaft; a first core-pulling insert is arranged on the rotating slider; a second core-pulling insert connected to the transmission slider is arranged on the top surface of the first core-pulling insert; the top surface of the second core-pulling insert is a sliding inclined surface; the end of the sliding inclined surface away from the transmission slider is lower than the sliding inclined surface and the transmission slider one end of the block is connected; a third core-pulling insert is arranged on the top surface of the second core-pulling insert, which is limited in position and can be lifted and lowered and slid on the rotating slider; the bottom surface of the third core-pulling insert is a core-pulling inclined surface matched with the sliding inclined surface; a pulling mechanism for pulling the third core-pulling insert downward is arranged on the top surface of the first core-pulling insert; a avoidance through hole for avoiding the pulling mechanism is arranged on the second core-pulling insert; the first core-pulling insert, the second core-pulling insert and the third core-pulling insert constitute an arc-shaped core-pulling piece; a delay limiting mechanism for delaying the sliding of the rotating slider is arranged on the forming template.

2. A rotary core-pulling structure according to claim 1, characterized in that: The rotating shaft is rotatably arranged on the top surface of the forming template; a sleeve sleeved on the rotating shaft is fixedly arranged on the top surface of the forming template; the rotating slider is rotatably sleeved on the sleeve; the top end of the rotating shaft passes through the sleeve and is fixedly connected to the transmission slider.

3. A rotary core-pulling structure according to claim 2, characterized in that: A polygonal insertion groove is provided at the top of the rotating shaft; a connecting threaded hole is provided at the bottom of the insertion groove; the transmission slider includes a transmission part and a connecting part; the transmission part is matched and slid in the arc-shaped through hole; the second core-pulling insert is connected to the transmission part; a protrusion matched and inserted into the insertion groove is provided at the bottom end of the connecting part; a connecting through hole coaxial with the connecting threaded hole is provided on the connecting part.

4. A rotary core-pulling structure according to claim 1, characterized in that: The driving mechanism comprises a gear and a driving machine arranged on the die base; the bottom end of the rotating shaft passing through the forming template is connected with the gear; a rack is connected to the output shaft of the driving machine; and the rack is meshed with the gear.

5. The rotary core-pulling structure according to claim 1, characterized in that: The pulling mechanism includes a pulling block and a pulling rod; the pulling block is arranged on the top surface of the first core-pulling insert; a cavity is arranged in the pulling block; one end of the pulling rod is arranged in the cavity; a limit block located in the cavity is arranged on the pulling rod; a spring is arranged between the limit block and the inner top surface of the cavity; the other end of the pulling rod passes through the avoidance through hole and is connected to the third core-pulling insert.

6. A rotary core-pulling structure according to claim 1, characterized in that: A sealing groove is provided on the side wall of the rotating slider; a connecting groove is provided at the bottom of the sealing groove; one end of the core pulling part is matched and inserted into the sealing groove; the end of the core pulling part inserted into the sealing groove is provided with a connecting block matched and inserted into the connecting groove; the connecting block includes a first connecting block and a third connecting block correspondingly arranged on the first core pulling insert and the third core pulling insert; the first connecting block is fixedly connected to the connecting groove; the third connecting block is slidably connected to the connecting groove; one end of the second core pulling insert inserted into the sealing groove passes through the arc through hole and is connected to the transmission slider; the rotating slider is provided with an avoidance groove for avoiding the rotation and movement of the second core pulling insert.

7. A rotary core-pulling structure according to claim 6, characterized in that: A first mounting threaded hole is arranged on the surface of the first connecting block opposite to the connecting groove; a countersunk through hole coaxial with the first mounting threaded hole is arranged on the inner side wall of the arc-shaped through hole; connecting slide grooves extending in the upper and lower directions are arranged on the two inner side walls extending in the upper and lower directions; and a connecting block slider which is respectively matched and slid in the two connecting slide grooves is arranged on the third connecting block.

8. The rotary core-pulling structure according to claim 1, characterized in that: The delay limiting mechanism includes a positioning bead; the positioning bead is arranged on the surface of the forming template opposite to the bottom surface of the rotating slider; and a positioning groove cooperating with the positioning bead is arranged on the bottom surface of the rotating slider.

9. The rotary core-pulling structure according to claim 1, characterized in that: A slider groove is arranged on the side wall of the rotating slider away from the core pulling part; a slider plate is detachably arranged in the slider groove; and the slider plate is not lower than the side surface of the rotating slider where the slider groove is located.

10. The rotary core-pulling structure according to claim 1, characterized in that: The forming template is provided with an arc-shaped pressure strip, and the pressure strip is used to prevent the rotating slider from being deflected due to force.

Images