Plastic chair mold with mold cavity inverted-pulling and internal-pulling demolding mechanism

Abstract

The utility model provides a plastic chair mold with a mold cavity inverted-pulling and internal-pulling demolding mechanism, and belongs to the technical field of molds. The mold comprises a lower mold plate, a bottom plate is arranged at the bottom of the lower mold plate, a forming insert is arranged on the lower mold plate in a protruding mode, a chair seat forming part, a chair back forming part and an armrest forming part are arranged on the forming insert, and the chair back forming part and the armrest forming part are integrally formed. A first connecting part connected with the chair seat forming part is arranged at the joint of the chair back forming part and the armrest forming part. The first hollowed-out part and the second hollowed-out part can form a hollowed-out structure below a chair back and a handrail, the cavity inverted pulling and inner pulling mechanism enables the second hollowed-out part to be subjected to core pulling before a product is ejected out in an inward core pulling mode, and compared with a mold adopting an external core pulling structure, the mold is smaller in size and smaller in occupied space.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds and relates to a plastic chair mold with a cavity inverted drawing and demoulding mechanism. Background Art

[0002] Plastic chairs are generally formed by injection molding. Currently, most plastic chairs have a gap between the side armrests and the seat. Therefore, when injection molding through the mold, a core-pulling structure needs to be set on the lower mold plate at this position. In the molds of the existing technology, the core-pulling structure is all external, which makes the side of the mold larger and occupies more space.

[0003] For example, a Chinese patent discloses a demoulding mechanism for a plastic seat mold [application number: 201120175716.7], which includes a mold fixed module and a movable module, the fixed module and the movable module are connected by a guide column, and a mold cavity of a plastic seat is formed between the fixed module and the movable module. The feature is that a seat insert is arranged in the mold cavity, the seat insert contacts the bottom of the plastic seat, a guide rod passes through the seat insert, one end of the guide rod is movably connected to the fixed module, and the other end of the guide rod is fixedly connected to the movable module, and a mold cavity is formed in the seat insert. There is a limiting hole, a pull rod passes through the limiting hole, the pull rod connects the moving module, a front outer slider and a rear outer slider are respectively provided on the front and rear sides of the seat insert, a front outer sliding cylinder and a rear slider cylinder are respectively installed on the front outer slider and the rear outer slider, the piston rods of the front outer sliding cylinder and the rear slider cylinder are respectively connected to the seat insert, an ejection bracket is installed on either side of the seat insert, an ejection cylinder is installed on the ejection bracket, the ejection cylinder is connected to the ejection plate, the ejection plate is connected to the ejection rod, and the ejection rod passes through the seat insert and contacts the bottom surface of the plastic seat. Utility Model Content

[0004] The purpose of the utility model is to solve the above problems and provide a plastic chair mold with a cavity inverted drawing and demoulding mechanism.

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

[0006] A plastic chair mold with a cavity-drawing and demolding mechanism comprises a lower template, a bottom plate is provided at the bottom of the lower template, a molding insert is protruding from the lower template, a seat molding part, a back molding part and an armrest molding part are provided on the molding insert, the back molding part and the armrest molding part are integrally formed, a No. 1 molding part connected to the seat molding part is provided at the connection between the back molding part and the armrest molding part, a No. 2 molding part connected to the seat molding part is provided on the side of the armrest molding part away from the back molding part, a No. 1 hollow part is formed between the back molding part, the seat molding part and the two No. 1 molding parts, a No. 2 hollow part is formed between the armrest molding part, the seat molding part, the No. 1 molding part and the No. 2 molding part, and a cavity-drawing and demolding mechanism is provided at the No. 2 hollow part.

[0007] In the above-mentioned plastic chair mold with a cavity inverted pull-out demolding mechanism, the cavity inverted pull-out mechanism includes two inclined hollow portion forming blocks, the No. 2 hollow portion is located on the outer end surface of the hollow portion forming block, and an inlay inner pull-out structure is provided between the lower template and the base plate.

[0008] In the above-mentioned plastic chair mold with a cavity pull-out demolding mechanism, the insert pull-out structure includes a guide seat fixed on the top of the base plate and inserted into the lower template. The guide seat is inclined toward the center of the base plate, and an oblique guide structure is provided between the guide seat and the hollow part forming block.

[0009] In the above-mentioned plastic chair mold with a cavity pull-out and demolding mechanism, the inclined guide structure includes a push-pull guide groove recessed inwardly on the outer surface of the guide seat, and a push-pull guide slider protruding from the inner end surface of the hollow forming block is inserted into the push-pull guide groove.

[0010] In the above-mentioned plastic chair mold with the cavity inverted drawing and demoulding mechanism, the cross-sections of the push-pull guide groove and the push-pull guide slider are T-shaped.

[0011] In the above-mentioned plastic chair mold with the cavity inverted drawing and demoulding mechanism, the push-pull guide slider and the hollow portion forming block are integrally formed.

[0012] In the above-mentioned plastic chair mold with the cavity inverted drawing and demoulding mechanism, the guide seat is detachably fixed to the base plate by a plurality of bolts.

[0013] In the above-mentioned plastic chair mold with the cavity inverted drawing and demoulding mechanism, a vertical fixed limit structure is also provided between the base plate and the lower template.

[0014] In the above-mentioned plastic chair mold with a cavity pull-out and demolding mechanism, the vertical fixed limit structure includes two side limit plates fixed on both sides of the base plate, and fixed limit slide grooves are vertically arranged in the side limit plates. Limit rods inserted into the fixed limit slide grooves are fixedly connected on both sides of the lower template.

[0015] In the above-mentioned plastic chair mold with a cavity inverting and inner pulling demolding mechanism, a bottom cavity for installing a hollow part forming block and a guide seat is provided at the bottom of the lower template, and an opening is provided at the bottom of the bottom cavity. Two lower limit plates corresponding to the hollow part forming blocks are provided at the opening of the bottom cavity, and the lower limit plates are detachably fixed to the lower template by a plurality of bolts.

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

[0017] 1. The No. 1 hollow part and the No. 2 hollow part can form a hollow structure under the chair back and under the armrest. The cavity inverted pull-out mechanism adopts an inward core-pulling method so that the No. 2 hollow part can be core-pulled before the product is ejected. Compared with the mold with an external core-pulling structure, the mold of the present application is smaller in size and occupies less space.

[0018] 2. Before the product is ejected, the distance between the lower template and the bottom plate is increased by moving the lower template upward. The inner pulling structure of the insert can drive the hollow forming block to move horizontally inside the lower template, thereby realizing the core pulling of the second hollow part.

[0019] 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

[0020] Figure 1 It is a three-dimensional diagram of the lower template;

[0021] Figure 2 It is a three-dimensional diagram of the lower template in the other direction;

[0022] Figure 3 It is a structural diagram of the bottom of the lower template;

[0023] Figure 4 It is a structural diagram of the base plate.

[0024] In the figure, the lower template 1, the base plate 2, the forming insert 3, the seat forming part 4, the back forming part 5, the armrest forming part 6, the No. 1 connecting part 7, the No. 2 connecting part 8, the No. 1 hollow part 9, the No. 2 hollow part 10, the cavity pull-out mechanism 11, the hollow part forming block 12, the insert inner pull-out structure 13, the guide seat 14, the push-pull guide slot 15, the push-pull guide slider 16, the vertical fixed limit structure 17, the side limit plate 18, the fixed limit slot 19, the limit rod 20, the bottom chamber 21, and the lower limit plate 22. DETAILED DESCRIPTION

[0025] like Figures 1-4 As shown, a plastic chair mold with a cavity extraction and demolding mechanism includes a lower template 1, a bottom plate 2 is provided at the bottom of the lower template 1, a molding insert 3 is protruding from the lower template 1, a seat molding part 4, a back molding part 5 and an armrest molding part 6 are provided on the molding insert 3, the back molding part 5 and the armrest molding part 6 are integrally formed, a No. 1 connecting part 7 connected to the seat molding part 4 is provided at the connection between the back molding part 5 and the armrest molding part 6, a No. 2 connecting part 8 connected to the seat molding part 4 is provided on the side of the armrest molding part 6 away from the back molding part 5, a No. 1 hollow part 9 is formed between the back molding part 5, the seat molding part 4 and the two No. 1 connecting parts 7, a No. 2 hollow part 10 is formed between the armrest molding part 6, the seat molding part 4, the No. 1 connecting part 7 and the No. 2 connecting part 8, and a cavity extraction and demolding mechanism 11 is provided at the No. 2 hollow part 10.

[0026] In the present invention, the No. 1 hollow portion 9 and the No. 2 hollow portion 10 can form a hollow structure under the chair back and under the armrest. The cavity inverted pull-out mechanism 11 adopts an inward core-pulling method so that the No. 2 hollow portion 10 can be core-pulled before the product is ejected. Compared with the mold using an external core-pulling structure, the mold of the present application is smaller in size and occupies less space.

[0027] Specifically, the cavity extraction mechanism 11 comprises two obliquely arranged hollowed-out forming blocks 12. The second hollowed-out portion 10 is located on the outer end surfaces of the hollowed-out forming blocks 12. An insert-and-withdraw mechanism 13 is positioned between the lower mold plate 1 and the base plate 2. Before the product is ejected, the lower mold plate is moved upward to increase the distance between them. This insert-and-withdraw mechanism 13 drives the hollowed-out forming blocks 12 to move horizontally into the interior of the lower mold plate, thereby pulling the core of the second hollowed-out portion 10.

[0028] Specifically, the insert inner-drawing structure 13 includes a guide seat 14 fixed to the top of the base plate 2 and inserted into the lower template 1. The guide seat 14 is tilted toward the center of the base plate 2, and an oblique guide structure is provided between the guide seat 14 and the hollow portion forming block 12. When the upper template moves upward, the oblique guide structure between the guide seat 14 and the hollow portion forming block 12 drives the hollow portion forming block 12 to move horizontally toward the interior of the lower template, thereby achieving the core pulling of the second hollow portion 10.

[0029] Specifically, the oblique guide structure includes a push-pull guide slot 15 recessed inwardly on the outer surface of the guide seat 14. A push-pull guide slider 16 protrudes from the inner end surface of the hollow portion forming block 12 and is inserted into the push-pull guide slot 15. The push-pull guide slot 15 and the push-pull guide slider 16 have a T-shaped cross-section. When the upper template moves upward, the push-pull guide slot 15 with a T-shaped cross-section on the guide seat 14 cooperates with the push-pull guide slider 16 with a T-shaped cross-section on the hollow portion forming block 12 to drive the hollow portion forming block 12 to move horizontally toward the interior of the lower template, thereby achieving core pulling of the second hollow portion 10.

[0030] Specifically, the push-pull guide slider 16 and the hollow portion forming block 12 are integrally formed to facilitate one-time casting.

[0031] Preferably, the guide seat 14 is detachably fixed to the base plate 2 by a plurality of bolts, and can be easily disassembled.

[0032] Preferably, combined Figure 4 As shown, a vertical fixed limit structure 17 is further provided between the base plate 2 and the lower template 1. The vertical fixed limit structure 17 includes two side limit plates 18 fixed to both sides of the base plate 2. The side limit plates 18 are vertically provided with fixed limit slots 19. Limit rods 20 are fixedly connected to both sides of the lower template 1 and inserted into the fixed limit slots 19. The fixed limit slots 19 on the side limit plates 18 cooperate with the limit rods 20 to limit the movement of the lower template and can determine the maximum distance of the lower template's upward movement.

[0033] Specifically, the bottom of the lower template 1 is provided with a bottom chamber 21 for mounting the hollow portion forming block 12 and the guide seat 14. The bottom of the bottom chamber 21 is provided with an opening. Two lower limit plates 22 corresponding to the hollow portion forming blocks 12 are provided at the opening of the bottom chamber 21. The lower limit plates 22 are detachably fixed to the lower template 1 via a plurality of bolts. The provision of the opening facilitates the installation and removal of the hollow portion forming block 12, and the lower limit plates can be used to lower the hollow portion forming block.

[0034] The working principle of the present invention is as follows: the first hollow portion 9 and the second hollow portion 10 can form a hollow structure under the chair back and under the armrest, and the cavity inverted pull-out mechanism 11 adopts an inward core-pulling method to enable the second hollow portion 10 to be core-pulled before the product is ejected. Compared with a mold with an external core-pulling structure, the mold of the present application is smaller in size and occupies less space;

[0035] Before the product is ejected, the distance between the lower template and the bottom plate is increased by moving the lower template upward, and the hollow part forming block 12 can be driven by the inner-pulling structure 13 of the insert to move horizontally inside the lower template, thereby realizing the core pulling of the No. 2 hollow part 10. When the upper template moves upward, the oblique guide structure between the guide seat 14 and the hollow part forming block 12 drives the hollow part forming block 12 to move horizontally inside the lower template, thereby realizing the core pulling of the No. 2 hollow part 10. When the upper template moves upward, the push-pull guide groove 15 with a T-shaped cross-section on the guide seat 14 cooperates with the push-pull guide slider 16 with a T-shaped cross-section on the hollow part forming block 12 to drive the hollow part forming block 12 to move horizontally inside the lower template, thereby realizing the core pulling of the No. 2 hollow part 10.

[0036] The fixed limit slot 19 on the side limit plate 18 cooperates with the limit rod 20 to limit the movement of the lower template and can position the maximum distance of the upper movement of the lower template. The opening is set to facilitate the installation and disassembly of the hollow part forming block 12, and the lower limit plate can limit the lower position of the hollow part forming block.

[0037] 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.

[0038] Although this article uses the lower template 1, base plate 2, forming insert 3, seat forming part 4, back forming part 5, armrest forming part 6, No. 1 connecting part 7, No. 2 connecting part 8, No. 1 hollow part 9, No. 2 hollow part 10, cavity pull-out mechanism 11, hollow part forming block 12, insert inner pull-out structure 13, guide seat 14, push-pull guide groove 15, push-pull guide slider 16, vertical fixed limit structure 17, side limit plate 18, fixed limit groove 19, limit rod 20, bottom chamber 21, lower limit plate 22, etc. more frequently, these terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restriction is contrary to the spirit of the present invention.

Claims

1. A plastic chair mold with a cavity inverted pull-out demoulding mechanism, comprising a lower mold plate (1), characterized in that: The bottom of the lower template (1) is provided with a bottom plate (2), the lower template (1) is provided with a protruding molding insert (3), the molding insert (3) is provided with a seat molding part (4), a back molding part (5) and an armrest molding part (6), the back molding part (5) and the armrest molding part (6) are integrally formed, the connection between the back molding part (5) and the armrest molding part (6) is provided with a No. 1 connecting part (7) connected to the seat molding part (4), the armrest molding part ( 6) A second connecting portion (8) connected to the seat forming portion (4) is provided on the side away from the backrest forming portion (5); a first hollow portion (9) is formed between the backrest forming portion (5), the seat forming portion (4) and the two first connecting portions (7); a second hollow portion (10) is formed between the armrest forming portion (6), the seat forming portion (4), the first connecting portion (7) and the second connecting portion (8); a cavity inverting and drawing mechanism (11) is provided at the second hollow portion (10).

2. The plastic chair mold with a cavity inverted drawing and demoulding mechanism according to claim 1 is characterized in that: The cavity inverting and drawing mechanism (11) comprises two inclined hollow portion forming blocks (12), the second hollow portion (10) is located on the outer end surface of the hollow portion forming block (12), and an insert drawing structure (13) is provided between the lower template (1) and the bottom plate (2).

3. The plastic chair mold with a cavity inverted drawing and demoulding mechanism according to claim 2 is characterized in that: The insert inner drawing structure (13) includes a guide seat (14) fixed on the top of the base plate (2) and inserted into the lower template (1); the guide seat (14) is inclined toward the center of the base plate (2); and an oblique guide structure is provided between the guide seat (14) and the hollow portion forming block (12).

4. The plastic chair mold with a cavity inverted drawing and demoulding mechanism according to claim 3 is characterized in that: The oblique guide structure includes a push-pull guide groove (15) recessed inwardly and arranged on the outer side of the guide seat (14), and a push-pull guide slider (16) protruding from the inner end surface of the hollow portion forming block (12) and inserted into the push-pull guide groove (15).

5. The plastic chair mold with a cavity inverted drawing and demoulding mechanism according to claim 4 is characterized in that: The push-pull guide slot (15) and the push-pull guide slider (16) have T-shaped cross sections.

6. The plastic chair mold with a cavity inverted drawing and demoulding mechanism according to claim 4, characterized in that: The push-pull guide slider (16) and the hollow portion forming block (12) are integrally formed.

7. The plastic chair mold with a cavity inverted drawing and demoulding mechanism according to claim 3 is characterized in that: The guide seat (14) is detachably fixed to the base plate (2) by a plurality of bolts.

8. The plastic chair mold with a cavity inverting and inner drawing demoulding mechanism according to claim 1 is characterized in that: A vertical limiting structure (17) is also provided between the base plate (2) and the lower template (1).

9. The plastic chair mold with a cavity inverted drawing and demoulding mechanism according to claim 8, characterized in that: The vertical fixed limit structure (17) includes two side limit plates (18) fixed on both sides of the base plate (2), and a fixed limit slide groove (19) is vertically arranged in the side limit plate (18). The two sides of the lower template (1) are fixedly connected with a limit rod (20) inserted into the fixed limit slide groove (19).

10. The plastic chair mold with a cavity inverted drawing and demoulding mechanism according to claim 7, characterized in that: The bottom of the lower template (1) is provided with a bottom chamber (21) for installing the hollow portion forming block (12) and the guide seat (14), the bottom of the bottom chamber (21) is provided with an opening, and two lower limit plates (22) corresponding to the hollow portion forming block (12) are provided at the opening of the bottom chamber (21), and the lower limit plates (22) are detachably fixed to the lower template (1) by a plurality of bolts.

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