Arc-shaped core-pulling mechanism of plastic sofa chair injection mold

Abstract

The utility model provides an arc-shaped core-pulling mechanism of a plastic sofa chair injection mold, and belongs to the technical field of molds. The mold comprises an upper mold plate and a lower mold plate, a forming cavity is formed between the upper mold plate and the lower mold plate, the lower mold plate is provided with four side walls, and one side wall is a core pulling side. The first arc-shaped core-pulling plate and the second arc-shaped core-pulling plate which are inserted into the forming cavity from the core-pulling side of the lower mold plate can directly form two arc-shaped splicing grooves in the armrest during injection molding, later processing is not needed, and therefore the production efficiency of the sofa chair armrest can be improved; the first arc-shaped core-pulling assembly and the second arc-shaped core-pulling assembly can drive the first arc-shaped core-pulling plate and the second arc-shaped core-pulling plate to be pulled out from the core-pulling side of the lower mold plate correspondingly so that a product can be conveniently ejected out, and after the product is subjected to injection molding, the external oil cylinder driving mechanism can drive the ejection plate to vertically move upwards. And the top plate vertically moves upwards to apply inclined thrust towards the core-pulling side to the product through the inclined ejection assembly.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds and relates to an arc-shaped core-pulling mechanism of an injection mold for a plastic sofa chair. Background Art

[0002] The body and armrests of a plastic sofa chair are generally injection-molded separately through two pairs of molds, and then spliced ​​together. In order to improve the comfort of the plastic sofa chair, there are a large number of curved parts on the body and armrests, and the connecting parts of the body and armrests generally use curved splicing parts. At present, during the production of armrests, the curved grooves on the armrests used for splicing cannot be injection-molded in one go through a core-pulling structure during the injection molding of the armrest body. Instead, the curved grooves need to be processed on the armrests by cutting, drilling, grinding, etc. after the armrests are removed from the mold, resulting in low production efficiency.

[0003] For example, a Chinese patent discloses an injection mold for molding an integrated chair armrest [application number: 201822124812.3], which includes a base, a lower mold base, an upper mold base, a lower mold core, an upper mold core and an ejection mechanism; the lower mold base is fixed above the base; a pouring gate is provided on the upper mold base, and a hot runner is detachably installed in the middle of the upper mold base, and the hot runner is connected to the pouring gate; the lower mold core is fixed to the surface of the lower mold base; the upper mold core is fixed to the bottom surface of the upper mold base and is located above the lower mold core, and the upper mold core and the lower mold core jointly form two cavities that are compatible with the integrated chair armrest. Utility Model Content

[0004] The purpose of the utility model is to solve the above problems and provide an arc-shaped core-pulling mechanism for an injection mold of a plastic sofa chair.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A curved core-pulling mechanism of an injection mold for a plastic sofa chair comprises an upper mold plate and a lower mold plate, a molding cavity being provided between the upper and lower mold plates, the lower mold plate having four side walls and one of the side walls being a core-pulling side, the lower mold plate being provided with a No. 1 curved core-pulling plate and a No. 2 curved core-pulling plate inserted into the molding cavity from the core-pulling side, the core-pulling side being further provided with a No. 1 curved core-pulling assembly and a No. 2 curved core-pulling assembly connected to the No. 1 curved core-pulling plate and the No. 2 curved core-pulling plate respectively, the lower side of the lower mold plate being further provided with a top plate driven by an external oil cylinder drive mechanism, the lower mold plate being further provided with an inclined ejection assembly connected to the top plate.

[0007] In the above-mentioned arc-shaped core-pulling mechanism of the injection mold for the plastic sofa chair, the No. 1 arc-shaped core-pulling assembly includes a No. 1 core-pulling seat fixed on the core-pulling side, the No. 1 core-pulling seat is arc-shaped and has a No. 1 arc-shaped slide groove with the same arc as the No. 1 arc-shaped core-pulling plate, and the No. 1 core-pulling seat is also provided with a No. 1 self-propelled driving assembly that can drive the No. 1 arc-shaped core-pulling plate to slide along the No. 1 arc-shaped slide groove.

[0008] In the above-mentioned arc-shaped core-pulling mechanism of the injection mold of the plastic sofa chair, the No. 1 self-propelled drive component includes a No. 1 arc-shaped tooth seat protruding from the top of the No. 1 core-pulling seat and having the same curvature as the No. 1 arc-shaped core-pulling plate. The outer wall of the No. 1 arc-shaped tooth seat has a tooth shape. The upper side of the No. 1 core-pulling seat is also provided with a No. 1 self-propelled seat fixedly connected to the outer end of the No. 1 arc-shaped core-pulling plate. The No. 1 self-propelled seat and the No. 1 arc-shaped core-pulling plate are respectively arranged on both sides of the No. 1 arc-shaped tooth seat. The No. 1 arc-shaped tooth seat is fixedly connected to a No. 1 self-propelled driver. The output shaft end of the No. 1 self-propelled driver is fixedly connected to a No. 1 traveling gear. The No. 1 traveling gear is engaged with the teeth on the No. 1 arc-shaped tooth seat.

[0009] In the above-mentioned arc-shaped core-pulling mechanism of the injection mold for the plastic sofa chair, the No. 2 arc-shaped core-pulling assembly includes a No. 2 core-pulling seat fixed on the core-pulling side, the No. 2 core-pulling seat is arc-shaped and has a No. 2 arc-shaped slide groove with the same curvature as the No. 2 arc-shaped core-pulling plate, and the No. 2 core-pulling seat is also provided with a No. 2 self-propelled driving assembly that can drive the No. 2 arc-shaped core-pulling plate to slide along the No. 2 arc-shaped slide groove.

[0010] In the above-mentioned arc-shaped core-pulling mechanism of the injection mold of the plastic sofa chair, the No. 2 self-propelled driving component includes a No. 2 arc-shaped tooth seat protruding from the top of the No. 2 core-pulling seat and having the same curvature as the curvature of the No. 2 arc-shaped core-pulling plate. The outer wall of the No. 2 arc-shaped tooth seat has a tooth shape. The upper side of the No. 2 core-pulling seat is also provided with a No. 2 self-propelled seat fixedly connected to the outer end of the No. 2 arc-shaped core-pulling plate. The No. 2 self-propelled seat and the No. 2 arc-shaped core-pulling plate are respectively arranged on both sides of the No. 2 arc-shaped tooth seat. The No. 2 arc-shaped tooth seat is fixedly connected with a No. 2 self-propelled driver. The output shaft end of the No. 2 self-propelled driver is fixedly connected with a No. 2 traveling gear. The No. 2 traveling gear is engaged with the tooth shape on the No. 2 arc-shaped tooth seat.

[0011] In the above-mentioned curved core-pulling mechanism of the plastic sofa chair injection mold, the curvature of the No. 1 curved core-pulling plate is greater than that of the No. 2 curved core-pulling plate, and the bending directions of the No. 1 curved core-pulling plate and the No. 2 curved core-pulling plate are the same.

[0012] In the above-mentioned arc-shaped core-pulling mechanism of the injection mold for the plastic sofa chair, three side core-pulling plates connected to the molding cavity are also provided on the other three side walls of the lower mold plate. The cross-section of the inner end faces of the side core-pulling plates is arc-shaped, and the inner end faces of two of the side core-pulling plates are adapted to the outer side walls of the No. 1 arc-shaped core-pulling plate and the No. 2 arc-shaped core-pulling plate. The upper mold plate is also provided with a core-pulling structure that can drive the three side core-pulling plates to move away from the molding cavity.

[0013] In the above-mentioned arc-shaped core-pulling mechanism of the plastic sofa chair injection mold, the core-pulling structure includes three groups of driving parts corresponding to the three side core-pulling plates, and the driving parts include a driving rod obliquely fixed on the upper mold plate, and the driving rod is obliquely inserted into the side core-pulling plate and slidably connected to the side core-pulling plate.

[0014] In the above-mentioned arc-shaped core-pulling mechanism of the injection mold for the plastic sofa chair, the inclined ejection assembly includes an intermediate inclined ejector block arranged in the middle of the lower template and an outer inclined ejector block arranged on the side of the lower template away from the core-pulling side. The inner end surface of the side core-pulling plate located on the opposite side of the core-pulling side is adapted to the outer end surface of the outer inclined ejector block. The intermediate inclined ejector block and the outer inclined ejector block are both connected to the ejector plate through two inclined ejector rods, and the top end of the inclined ejector rod is inclined toward the core-pulling side.

[0015] In the above-mentioned arc-shaped core-pulling mechanism of the plastic sofa chair injection mold, the external cylinder drive mechanism includes two lifting cylinders symmetrically arranged on both sides of the lower mold plate, the lifting cylinders are fixed on the top plate and the output shaft of the lifting cylinders passes through the top plate and is fixedly connected to the bottom plate arranged on the lower side of the top plate.

[0016] Compared with the existing technology, the advantages of this utility model are:

[0017] 1. The No. 1 arc-shaped core-pulling plate and the No. 2 arc-shaped core-pulling plate inserted into the molding cavity from the core-pulling side of the lower template can directly form two arc-shaped splicing grooves in the armrest during injection molding, without the need for post-processing, thereby improving the production efficiency of the sofa chair armrests. After the armrests are injection-molded, the No. 1 arc-shaped core-pulling assembly and the No. 2 arc-shaped core-pulling assembly can respectively drive the No. 1 arc-shaped core-pulling plate and the No. 2 arc-shaped core-pulling plate to be pulled out from the core-pulling side of the lower template to facilitate product ejection. After the product is injection-molded, the external cylinder drive mechanism can drive the top plate to move vertically upward. The vertical upward movement of the top plate can apply an oblique thrust toward the core-pulling side to the product through the inclined ejection assembly.

[0018] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the external structure of the utility model;

[0020] Figure 2 It is a structural diagram of the lower template;

[0021] Figure 3 It is a schematic diagram of the local structure of the lower template;

[0022] Figure 4 It is a partial structural diagram of the utility model. DETAILED DESCRIPTION

[0023] like Figures 1-4 As shown, a curved core-pulling mechanism of a plastic sofa chair injection mold includes an upper template 1 and a lower template 2. A molding cavity 3 is provided between the upper template 1 and the lower template 2. The lower template 2 has four side walls, and one of the side walls is a core-pulling side 4. The lower template 2 is provided with a No. 1 curved core-pulling plate 5 and a No. 2 curved core-pulling plate 6 inserted from the core-pulling side 4 into the molding cavity 3. The core-pulling side 4 is also provided with a No. 1 curved core-pulling assembly 7 and a No. 2 curved core-pulling assembly 8 respectively connected to the No. 1 curved core-pulling plate 5 and the No. 2 curved core-pulling plate 6. The lower side of the lower template 2 is also provided with a top plate 9 driven by an external oil cylinder drive mechanism. The lower template 2 is also provided with an inclined ejection assembly 10 connected to the top plate 9.

[0024] In the utility model, the arc-shaped core-pulling plate No. 1 and the arc-shaped core-pulling plate No. 2 inserted into the molding cavity from the core-pulling side of the lower template can directly form two arc-shaped splicing grooves in the armrest during injection molding, without the need for post-processing, thereby improving the production efficiency of the sofa chair armrests. After the armrests are injection-molded, the arc-shaped core-pulling assembly No. 1 and the arc-shaped core-pulling assembly No. 2 can respectively drive the arc-shaped core-pulling plate No. 1 and the arc-pulling plate No. 2 to be pulled out from the core-pulling side of the lower template to facilitate product ejection. After the product is injection-molded, the external cylinder drive mechanism can drive the top plate 9 to move vertically upward. The vertical upward movement of the top plate can apply an oblique thrust toward the core-pulling side to the product through the inclined ejection assembly 10.

[0025] Specifically, the No. 1 curved core pulling assembly 7 includes a No. 1 core pulling seat 11 fixed to the core pulling side 4. The No. 1 core pulling seat 11 is curved and has a No. 1 curved chute 12 with the same curvature as the No. 1 curved core pulling plate 5. The No. 1 core pulling seat 11 is also provided with a No. 1 self-propelled drive assembly that can drive the No. 1 curved core pulling plate 5 to slide along the No. 1 curved chute 12 with the same curvature as the No. 1 curved core pulling plate 5. The No. 1 self-propelled drive assembly can drive the No. 1 curved core pulling plate 5 to slide along the No. 1 curved chute 12 with the same curvature as the No. 1 curved core pulling plate 5, thereby allowing the No. 1 curved core pulling plate 5 and the handrail product to be separated without damage.

[0026] Specifically, the No. 1 self-propelled drive assembly includes a No. 1 arc-shaped tooth seat 13 protruding from the top of the No. 1 core-pulling seat 11 and having the same curvature as the No. 1 arc-shaped core-pulling plate 5. The outer wall of the No. 1 arc-shaped tooth seat 13 has a tooth shape. The upper side of the No. 1 core-pulling seat 11 is also provided with a No. 1 self-propelled seat 14 fixedly connected to the outer end of the No. 1 arc-shaped core-pulling plate 5. The No. 1 self-propelled seat 14 and the No. 1 arc-shaped core-pulling plate 5 are respectively arranged on both sides of the No. 1 arc-shaped tooth seat 13. A No. 1 self-propelled driver 15 is fixedly connected to the No. 1 arc-shaped tooth seat 13. The output shaft end of the No. 1 self-propelled driver 15 is fixedly connected to a No. 1 traveling gear 16. The No. 1 traveling gear 16 is engaged with the teeth on the No. 1 arc-shaped tooth seat 13. The No. 1 self-propelled driver 15 can drive the No. 1 traveling gear 16 to rotate. The rotation of the No. 1 traveling gear 16 cooperates with the tooth shape on the side of the No. 1 arc-shaped tooth seat 13 to drive the No. 1 arc-shaped tooth seat 13 to move along the No. 1 arc-shaped tooth seat 13 with the same curvature as the No. 1 arc-shaped core-pulling plate 5, thereby driving the No. 1 arc-shaped core-pulling plate 5 to slide along the No. 1 arc-shaped slide groove 12 to realize automatic core pulling.

[0027] Those skilled in the art should understand that the first self-propelled drive 15 can be a rotary cylinder or a motor, etc.

[0028] Specifically, the second curved core pulling assembly 8 includes a second core pulling seat 17 fixed to the core pulling side 4. The second core pulling seat 17 is curved and has a second curved chute 18 with the same curvature as the second curved core pulling plate 6. The second core pulling seat 17 is also provided with a second self-propelled drive assembly capable of driving the second curved core pulling plate 6 to slide along the second curved chute 18. The second self-propelled drive assembly can drive the second curved core pulling plate to slide along the second curved chute with the same curvature as the second curved core pulling plate, thereby allowing the second curved core pulling plate and the handrail product to be separated without damage.

[0029] The No. 2 self-propelled driving assembly includes a No. 2 arc-shaped tooth seat 19 protruding from the top of the No. 2 core-pulling seat 17 and having the same curvature as the No. 2 arc-shaped core-pulling plate 6. The outer wall of the No. 2 arc-shaped tooth seat 19 has a tooth shape. The upper side of the No. 2 core-pulling seat 17 is also provided with a No. 2 self-propelled seat 20 fixedly connected to the outer end of the No. 2 arc-shaped core-pulling plate 6. The No. 2 self-propelled seat 20 and the No. 2 arc-shaped core-pulling plate 6 are respectively arranged on both sides of the No. 2 arc-shaped tooth seat 19. The No. 2 self-propelled driver 21 is fixedly connected to the No. 2 arc-shaped tooth seat 19. The output shaft end of the No. 2 self-propelled driver 21 is fixedly connected to the No. 2 traveling gear 22. The No. 2 traveling gear 22 is engaged with the tooth shape on the No. 2 arc-shaped tooth seat 19.

[0030] The No. 2 self-propelled driver can drive the No. 2 traveling gear to rotate. The rotation of the No. 2 traveling gear cooperates with the tooth shape on the side of the No. 2 arc-shaped tooth seat to drive the No. 2 arc-shaped tooth seat to move along the No. 2 arc-shaped tooth seat with the same curvature as the No. 2 arc-shaped core-pulling plate, thereby driving the No. 2 arc-shaped core-pulling plate to slide along the No. 2 arc-shaped slide groove to realize automatic core pulling.

[0031] Those skilled in the art should understand that the second self-propelled drive may be a rotary cylinder or a motor, etc.

[0032] Specifically, the curvature of the first arc-shaped core-pulling plate 5 is greater than that of the second arc-shaped core-pulling plate 6 , and the bending directions of the first arc-shaped core-pulling plate 5 and the second arc-shaped core-pulling plate 6 are the same.

[0033] Specifically, three side core pulling plates 23 connected to the molding cavity 3 are further provided on the other three side walls of the lower mold plate 2. The cross-section of the inner end surfaces of the side core pulling plates 23 is arc-shaped, and the inner end surfaces of two of the side core pulling plates 23 are adapted to the outer side walls of the first arc-shaped core pulling plate 5 and the second arc-shaped core pulling plate 6. The upper mold plate 1 is also provided with a core pulling structure capable of driving the three side core pulling plates 23 to move away from the molding cavity 3. The three side core pulling plates can form the arc-shaped side walls of the other three sides of the handrail, and when the upper mold plate and the lower mold plate are separated, the core pulling structure can drive the three side core pulling plates to move away from the molding cavity, so that the side core pulling plates and the handrail product are separated, so as to facilitate the ejection and demolding of the product.

[0034] Specifically, the core-pulling structure includes three sets of driving members corresponding to the three side core-pulling plates 23. The driving members include driving rods 24 fixed obliquely to the upper mold plate 1. The driving rods 24 are obliquely inserted into the side core-pulling plates 23 and are slidably connected to the side core-pulling plates 23. When the upper mold plate moves upward, it can drive the oblique driving rods 24 to move vertically upward. The vertical upward movement of the driving rods can drive the side core-pulling plates to move away from the molding cavity.

[0035] Specifically, the inclined ejector assembly 10 includes a middle inclined ejector block 25 disposed in the middle of the lower mold plate 2 and an outer inclined ejector block 26 disposed on the side of the lower mold plate 2 away from the core-pulling side 4. The inner end surface of the side core-pulling plate 23 located opposite the core-pulling side 4 is adapted to the outer end surface of the outer inclined ejector block 26. The middle inclined ejector block 25 and the outer inclined ejector block 26 are both connected to the ejector plate 9 via two inclined ejector rods 27, the top ends of which are inclined toward the core-pulling side 4. When the ejector plate moves upward, the inclined ejector rods can drive the middle inclined ejector block 25 and the outer inclined ejector block 26 to move diagonally upward toward the core-pulling side, thereby applying an oblique upward thrust to the product.

[0036] Specifically, the external cylinder drive mechanism includes two lifting cylinders 28 symmetrically positioned on either side of the lower mold plate 2. These cylinders 28 are fixed to the top plate 9, and their output shafts extend through the top plate 9 and are fixedly connected to the bottom plate below it. The operation of these two cylinders can lift the top plate vertically.

[0037] The working principle of the utility model is as follows: the No. 1 arc-shaped core-pulling plate and the No. 2 arc-shaped core-pulling plate inserted into the molding cavity from the core-pulling side of the lower template can directly form two arc-shaped splicing grooves in the armrest during injection molding, without the need for post-processing, thereby improving the production efficiency of the sofa chair armrests; after the armrests are injection-molded, the No. 1 arc-shaped core-pulling assembly and the No. 2 arc-shaped core-pulling assembly can respectively drive the No. 1 arc-shaped core-pulling plate and the No. 2 arc-shaped core-pulling plate to be pulled outward from the core-pulling side of the lower template to facilitate product ejection; after the product is injection-molded, the external oil cylinder drive mechanism can drive the top plate 9 to move vertically upward, and the vertical upward movement of the top plate can apply an oblique thrust toward the core-pulling side to the product through the inclined ejection assembly 10;

[0038] The No. 1 self-propelled driving assembly can drive the No. 1 arc-shaped core-pulling plate 5 to slide along the No. 1 arc-shaped chute 12 with the same curvature as the No. 1 arc-shaped core-pulling plate 5, so that the No. 1 arc-shaped core-pulling plate 5 and the handrail product can be separated without damage. The No. 1 self-propelled driver 15 can drive the No. 1 travel gear 16 to rotate. The rotation of the No. 1 travel gear 16 cooperates with the tooth shape on the side of the No. 1 arc-shaped gear seat 13 to drive the No. 1 arc-shaped gear seat 13 to move along the No. 1 arc-shaped gear seat 13 with the same curvature as the No. 1 arc-shaped core-pulling plate 5, thereby driving the No. 1 arc-shaped core-pulling plate 5 along the No. 1 arc-shaped chute 1 2 slides to realize automatic core pulling. The No. 2 self-propelled driving assembly can drive the No. 2 arc core pulling plate to slide along the No. 2 arc chute with the same curvature as the No. 2 arc core pulling plate, so that the No. 2 arc core pulling plate and the handrail product can be separated without damage. The No. 2 self-propelled driver can drive the No. 2 travel gear to rotate. The rotation of the No. 2 travel gear cooperates with the tooth shape on the side of the No. 2 arc gear seat to drive the No. 2 arc gear seat to move along the No. 2 arc gear seat with the same curvature as the No. 2 arc core pulling plate, thereby driving the No. 2 arc core pulling plate to slide along the No. 2 arc chute to realize automatic core pulling.

[0039] The three side core-pulling plates can form the arc-shaped side walls of the other three sides of the handrail, and when the upper template and the lower template are separated, the three side core-pulling plates can be driven by the core-pulling structure to move away from the molding cavity, so that the side core-pulling plates and the handrail product are separated, so as to facilitate the ejection and demoulding of the product. When the upper template moves upward, it can drive the inclined driving rod 24 to move vertically upward. The vertical upward movement of the driving rod can drive the side core-pulling plates to move away from the molding cavity. When the top plate moves upward, the middle inclined ejector block 25 and the outer inclined ejector block 26 can be driven by the inclined ejector rod to move obliquely upward toward the core-pulling side, thereby applying an oblique upward thrust to the product. The action of the two lifting cylinders can drive the top plate to rise and fall in the vertical direction.

[0040] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A curved core-pulling mechanism for an injection mold of a plastic sofa chair, comprising an upper mold plate (1) and a lower mold plate (2), characterized in that: A molding cavity (3) is provided between the upper mold plate (1) and the lower mold plate (2), the lower mold plate (2) has four side walls, one of which is a core-pulling side (4), the lower mold plate (2) is provided with a first arc-shaped core-pulling plate (5) and a second arc-shaped core-pulling plate (6) inserted from the core-pulling side (4) into the molding cavity (3), the core-pulling side (4) is further provided with a first arc-shaped core-pulling assembly (7) and a second arc-shaped core-pulling assembly (8) respectively connected to the first arc-shaped core-pulling plate (5) and the second arc-shaped core-pulling plate (6), the lower side of the lower mold plate (2) is further provided with a top plate (9) driven by an external oil cylinder driving mechanism, and the lower mold plate (2) is further provided with an inclined ejection assembly (10) connected to the top plate (9).

2. The arc-shaped core-pulling mechanism of the plastic sofa chair injection mold according to claim 1, characterized in that: The No. 1 arc-shaped core pulling assembly (7) includes a No. 1 core pulling seat (11) fixed on the core pulling side (4), the No. 1 core pulling seat (11) is arc-shaped and has a No. 1 arc-shaped slide groove (12) with the same arc as the No. 1 arc-shaped core pulling plate (5), and the No. 1 core pulling seat (11) is also provided with a No. 1 self-propelled driving assembly that can drive the No. 1 arc-shaped core pulling plate (5) to slide along the No. 1 arc-shaped slide groove (12).

3. The arc-shaped core-pulling mechanism of the plastic sofa chair injection mold according to claim 2, characterized in that: The No. 1 self-propelled driving assembly includes a No. 1 arc-shaped tooth seat (13) protruding from the top of the No. 1 core-pulling seat (11) and having the same curvature as the No. 1 arc-shaped core-pulling plate (5). The outer wall of the No. 1 arc-shaped tooth seat (13) has a tooth shape. The upper side of the No. 1 core-pulling seat (11) is also provided with a No. 1 self-propelled seat (14) fixedly connected to the outer end of the No. 1 arc-shaped core-pulling plate (5). The No. 1 self-propelled seat (14) and the No. 1 arc-shaped core-pulling plate (5) are respectively arranged on both sides of the No. 1 arc-shaped tooth seat (13). The No. 1 arc-shaped tooth seat (13) is fixedly connected to a No. 1 self-propelled driver (15). The output shaft end of the No. 1 self-propelled driver (15) is fixedly connected to a No. 1 travel gear (16). The No. 1 travel gear (16) is meshed with the teeth on the No. 1 arc-shaped tooth seat (13).

4. The arc-shaped core-pulling mechanism of the plastic sofa chair injection mold according to claim 1, characterized in that: The second arc-shaped core pulling assembly (8) includes a second core pulling seat (17) fixed on the core pulling side (4), the second core pulling seat (17) is arc-shaped and has a second arc-shaped slide groove (18) with the same arc as the second arc-shaped core pulling plate (6) on the second core pulling seat (17), and the second core pulling seat (17) is also provided with a second self-propelled driving assembly that can drive the second arc-shaped core pulling plate (6) to slide along the second arc-shaped slide groove (18).

5. The arc-shaped core-pulling mechanism of the plastic sofa chair injection mold according to claim 4, characterized in that: The second self-propelled driving assembly includes a second arc-shaped tooth seat (19) protruding from the top of the second core-pulling seat (17) and having the same curvature as the curvature of the second arc-shaped core-pulling plate (6). The outer wall of the second arc-shaped tooth seat (19) has a tooth shape. The upper side of the second core-pulling seat (17) is also provided with a second self-propelled seat (20) fixedly connected to the outer end of the second arc-shaped core-pulling plate (6). The second self-propelled seat (20) and the second arc-shaped core-pulling plate (6) are respectively arranged on both sides of the second arc-shaped tooth seat (19). The second self-propelled driver (21) is fixedly connected to the second arc-shaped tooth seat (19). The output shaft end of the second self-propelled driver (21) is fixedly connected to the second travel gear (22). The second travel gear (22) is engaged with the tooth shape on the second arc-shaped tooth seat (19).

6. The arc-shaped core-pulling mechanism of the plastic sofa chair injection mold according to claim 1, characterized in that: The curvature of the first arc-shaped core-pulling plate (5) is greater than that of the second arc-shaped core-pulling plate (6), and the bending directions of the first arc-shaped core-pulling plate (5) and the second arc-shaped core-pulling plate (6) are the same.

7. The arc-shaped core-pulling mechanism of the plastic sofa chair injection mold according to claim 1, characterized in that: The other three side walls of the lower template (2) are further provided with three side core-pulling plates (23) connected to the molding cavity (3), the cross-section of the inner end faces of the side core-pulling plates (23) is arc-shaped, and the inner end faces of two of the side core-pulling plates (23) are adapted to the outer side walls of the first arc-shaped core-pulling plate (5) and the second arc-shaped core-pulling plate (6), and the upper template (1) is further provided with a core-pulling structure capable of driving the three side core-pulling plates (23) to move away from the molding cavity (3).

8. The arc-shaped core-pulling mechanism of the plastic sofa chair injection mold according to claim 7, characterized in that: The core pulling structure includes three groups of driving members corresponding to the three side core pulling plates (23), and the driving members include a driving rod (24) fixed obliquely on the upper template (1), and the driving rod (24) is obliquely inserted into the side core pulling plate (23) and slidably connected to the side core pulling plate (23).

9. The arc-shaped core-pulling mechanism of the plastic sofa chair injection mold according to claim 7, characterized in that: The inclined ejection assembly (10) includes an intermediate inclined ejector block (25) arranged in the middle of the lower template (2) and an outer inclined ejector block (26) arranged on the side of the lower template (2) away from the core-pulling side (4). The inner end surface of the side core-pulling plate (23) located on the side opposite to the core-pulling side (4) is adapted to the outer end surface of the outer inclined ejector block (26). The intermediate inclined ejector block (25) and the outer inclined ejector block (26) are both connected to the ejector plate (9) through two inclined ejector rods (27), and the top end of the inclined ejector rod (27) is inclined toward the core-pulling side (4).

10. The arc-shaped core-pulling mechanism of the plastic sofa chair injection mold according to claim 9, characterized in that: The external cylinder drive mechanism includes two lifting cylinders (28) symmetrically arranged on both sides of the lower template (2), the lifting cylinders (28) are fixed on the top plate (9), and the output shafts of the lifting cylinders (28) pass through the top plate (9) and are fixedly connected to the bottom plate arranged on the lower side of the top plate (9).

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