Plastic injection molding chair mold combination core pulling mechanism

Abstract

This utility model belongs to the field of mold technology, and particularly relates to a combined core-pulling mechanism for a plastic injection molded chair. This utility model includes a lower mold and an upper mold for molding a plastic chair. A molding insert is provided between the lower and upper molds, and an auxiliary molding insert is provided within the molding insert. When the auxiliary molding insert is in contact with the lower mold, a complete cavity is formed. An injection molded part is positioned above the upper mold, and a combined core-pulling mechanism is provided between the injection molded part and the upper mold. In use, this utility model, through the small shaft hole forming core-pulling rod and the plastic chair alignment groove forming core-pulling block in the combined core-pulling mechanism, in conjunction with the auxiliary molding insert, simultaneously forms the small shaft hole and alignment groove structure of the plastic chair during injection molding. This avoids the secondary processing steps required for these structures in traditional technologies, significantly shortening the production cycle and reducing processing costs.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology and relates to a combined core-pulling mechanism for plastic injection molding chair molds. Background Technology

[0002] In the injection molding process of plastic chairs, these chairs typically contain complex structures such as small shaft holes and alignment grooves. Traditional molds often employ multiple core-pulling operations or secondary processing to form these structures. Multiple core-pulling operations not only increase the complexity of the mold structure and prolong the core-pulling and demolding time, but also easily lead to product deformation and damage due to asynchronous core-pulling. Secondary processing requires additional steps and equipment, increasing the production cycle and processing costs, and reducing production efficiency. Therefore, there is an urgent need to design a combined core-pulling mechanism for plastic injection molding chair molds that can simultaneously mold complex structures and achieve efficient core-pulling and demolding.

[0003] To overcome the shortcomings of existing technologies, people have continuously explored and proposed various solutions. For example, Chinese patent discloses a cross-filling type two-color plastic chair one-piece injection mold [application number: 201711273042.2], which includes upper and lower plates. The upper plate has a first runner plate, a first cavity, a second runner plate, and a second cavity. The first runner plate is connected to a first gate, and the second runner plate is connected to a second gate. The first cavity has a chair back panel and a seat panel. The chair back panel has a first-color groove for the chair back and a second-color groove for the chair back. The seat plate features a two-color protrusion design, with a first-color groove and a second-color protrusion within the seat plate. The lower plate has first and second cores, each housing an upper lifting cylinder, a side-pulling cylinder, and a slider. The side-pulling cylinder's piston rod connects to the slider, which has a slanted groove connecting to a second-color lifting block and a slanted rail below. The first and second cores also have a backrest insert and a seat plate insert, respectively. The backrest insert has a second-color lifting groove, and the lower part of the seat plate insert connects to the upper lifting cylinder's piston rod. A push-out cylinder is located on one side of the seat plate insert, and its piston rod mates with the plastic chair. However, this design still requires multiple core-pulling or secondary processing for forming the small shaft hole and alignment groove structure, resulting in a long production cycle and high cost. Utility Model Content

[0004] The purpose of this invention is to address the above-mentioned problems by providing a combined core-pulling mechanism for plastic injection molding chair molds.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A combined core-pulling mechanism for a plastic injection molded chair includes a lower mold and an upper mold. A molding insert is provided between the lower and upper molds. An auxiliary molding insert is provided within the molding insert. When the auxiliary molding insert is in contact with the lower mold, a complete cavity is formed. An injection molded part is provided above the upper mold. A combined core-pulling mechanism is provided between the injection molded part and the upper mold, and the combined core-pulling mechanism corresponds to the position of the molding insert.

[0007] In the above-mentioned combined core-pulling mechanism for plastic injection molding chair mold, the combined core-pulling mechanism includes a plurality of small shaft hole forming core-pulling rods and plastic chair alignment groove forming core-pulling blocks disposed between the injection molded part and the upper mold for molding the plastic chair, and the small shaft hole forming core-pulling rods and plastic chair alignment groove forming core-pulling blocks are arranged alternately.

[0008] In the above-mentioned plastic injection molding chair mold combination core-pulling mechanism, a core-pulling connector is provided below the injection molded part, and the small shaft hole forming core-pulling rod and the plastic chair alignment groove forming core-pulling block are respectively fixedly connected to the core-pulling connector.

[0009] In the above-mentioned plastic injection molding chair mold combination core pulling mechanism, the core pulling connector includes a core pulling connecting slide plate disposed below the injection molded part, and the small shaft hole forming core pulling rod and the plastic chair alignment groove forming core pulling block are respectively fixedly connected to the core pulling connecting slide plate.

[0010] In the above-mentioned plastic injection molding chair mold combination core pulling mechanism, the side of the upper mold of the plastic chair molding is provided with a sliding plate drive component, which is connected to the core pulling connecting sliding plate.

[0011] In the above-mentioned plastic injection molding chair mold combination core-pulling mechanism, the slide drive component includes a cylinder disposed on the side of the upper mold of the plastic chair molding. The power shaft of the cylinder is connected to the core-pulling connecting slide. The center line of the power shaft of the cylinder is parallel to the center line of the small shaft hole forming core-pulling rod. The small shaft hole forming core-pulling rod and the plastic chair alignment groove forming core-pulling block are parallel to each other.

[0012] In the above-mentioned plastic injection molding chair mold combination core pulling mechanism, the injection molded part includes an injection main board disposed above the upper mold of the plastic chair molding, and the bottom of the injection main board is provided with an injection tube.

[0013] In the above-mentioned plastic injection molding chair mold combination core-pulling mechanism, the injection tube passes through the core-pulling connecting slide, and the small shaft hole forming core-pulling rod and the plastic chair alignment groove forming core-pulling block are respectively staggered with the injection tube.

[0014] In the above-mentioned plastic injection molding chair mold combination core pulling mechanism, the core pulling connecting slide plate is provided with several limiting slide shafts, and the limiting slide shafts extend into the upper mold of the plastic chair molding.

[0015] In the above-mentioned plastic injection molding chair mold combination core pulling mechanism, a fixed side plate is provided between the injection molding main board and the plastic chair molding upper mold, and an oil cylinder is provided at the end of the plastic chair molding upper mold, and the power shaft of the oil cylinder is fixedly connected to the fixed side plate.

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

[0017] 1. In the process of use, the small shaft hole forming core-pulling rod and the plastic chair alignment groove forming core-pulling block in the combined core-pulling mechanism, together with the auxiliary forming insert, simultaneously form the small shaft hole and alignment groove structure of the plastic chair during the injection molding process. This avoids the secondary processing of these structures in the traditional technology, significantly shortens the production cycle and reduces the processing cost.

[0018] 2. This utility model utilizes a core-pulling connecting slide to integrate and connect the small shaft hole forming core-pulling rod and the plastic chair alignment groove forming core-pulling block. The slide is driven by a cylinder to achieve synchronous core-pulling action. Compared with the existing technology of pulling cores separately, this greatly improves the efficiency of core-pulling and demolding, while avoiding product quality problems caused by asynchronous core pulling.

[0019] 3. The limiting slide shaft in this utility model guides the core-pulling connecting slide plate, and the hydraulic cylinder assists in fixing the injection molding main plate, ensuring the stability of the core-pulling process and the injection molding process, reducing shaking and deviation during mold operation, and improving the service life of the mold and the molding accuracy of the product.

[0020] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 This is a partial structural schematic diagram of the present invention.

[0023] Figure 3 This is a partial structural schematic diagram of another aspect of this utility model.

[0024] Figure 4 This is a partial structural schematic diagram of another aspect of this utility model.

[0025] In the diagram: 1. Lower mold for plastic chair molding; 2. Upper mold for plastic chair molding; 3. Molding insert; 4. Auxiliary molding insert; 5. Injection part; 6. Combined core-pulling mechanism; 7. Small shaft hole molding core-pulling rod; 8. Plastic chair alignment groove molding core-pulling block; 9. Core-pulling connector; 10. Core-pulling connecting slide plate; 11. Slide plate drive component; 12. Cylinder; 13. Injection main board; 14. Injection tube; 15. Limiting slide shaft; 16. Fixed side plate; 17. Hydraulic cylinder. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] like Figure 1-4 As shown, a combined core-pulling mechanism for a plastic injection molded chair includes a lower mold 1 and an upper mold 2 for molding a plastic chair. A molding insert 3 is provided between the lower mold 1 and the upper mold 2. An auxiliary molding insert 4 is provided inside the molding insert 3. When the auxiliary molding insert 4 is in contact with the lower mold 1, a complete cavity is formed. An injection molded part 5 is provided above the upper mold 2. A combined core-pulling mechanism 6 is provided between the injection molded part 5 and the upper mold 2. The combined core-pulling mechanism 6 is positioned corresponding to the molding insert 3.

[0028] In this embodiment, during the injection molding process, when the mold closes, it fits tightly with the lower mold 1 of the plastic chair forming a complete plastic chair forming cavity. This cavity provides molding space for the main body of the plastic chair. The injection molded part 5 is arranged above the upper mold 2 of the plastic chair forming. A combined core-pulling mechanism 6 is installed between the injection molded part 5 and the upper mold 2. The combined core-pulling mechanism 6 and the molding insert 3 are vertically aligned. This layout allows the core-pulling mechanism to accurately act on the areas in the cavity that need to be molded with small shaft holes and alignment grooves. After injection molding is completed, the mold is opened. By moving the combined core-pulling mechanism 6, synchronous core-pulling can be achieved without separate core-pulling, thus improving the efficiency of core-pulling and demolding.

[0029] Combination Figure 1-4 As shown, the combined core-pulling mechanism 6 includes a plurality of small shaft hole forming core-pulling rods 7 and plastic chair alignment groove forming core-pulling blocks 8 disposed between the injection molded part 5 and the upper mold 2 for molding the plastic chair. The small shaft hole forming core-pulling rods 7 and plastic chair alignment groove forming core-pulling blocks 8 are arranged alternately.

[0030] Specifically, during the injection molding stage, the small shaft hole forming core-pulling rod 7 acts as the forming component for the small shaft hole, and its shape matches the inner wall of the small shaft hole. After the molten plastic solidifies around it, the small shaft hole is formed. The plastic chair alignment groove forming core-pulling block 8 corresponds to the forming of the alignment groove structure. The two are set up alternately, breaking the limitation of traditional molds forming different structures separately. It innovatively realizes the simultaneous forming of the small shaft hole and the alignment groove structure in the same injection molding process, reducing the molding process, avoiding secondary processing, improving production efficiency, and reducing production costs.

[0031] The injection molded part 5 is provided with a core-pulling connector 9 below it, and the small shaft hole forming core-pulling rod 7 and the plastic chair alignment groove forming core-pulling block 8 are respectively fixedly connected to the core-pulling connector 9.

[0032] In this embodiment, the core-pulling connector 9 connects the originally independent small shaft hole forming core-pulling rod 7 and the plastic chair alignment groove forming core-pulling block 8 into a whole structure, providing the necessary conditions for subsequent synchronous core pulling. This ensures that the two components can maintain a consistent movement rhythm during the demolding process, avoiding quality problems such as tearing and deformation of the corresponding structure of the plastic chair due to asynchronous core pulling, and ensuring the stability of product quality.

[0033] Combination Figure 2 , Figure 3 As shown, the core-pulling connector 9 includes a core-pulling connecting slide plate 10 disposed below the injection molded part 5, and the small shaft hole forming core-pulling rod 7 and the plastic chair alignment groove forming core-pulling block 8 are respectively fixedly connected to the core-pulling connecting slide plate 10.

[0034] In this embodiment, the core-pulling connecting slide plate 10 is used to connect and fix the small shaft hole forming core-pulling rod 7 and the plastic chair alignment groove forming core-pulling block 8.

[0035] The upper mold 2 for molding the plastic chair is provided with a skateboard drive component 11 on its side, and the skateboard drive component 11 is connected to the core-pulling connecting skateboard 10.

[0036] In this embodiment, the core-pulling connecting slide 10 is driven by the slide drive component 11, which has a high degree of automation.

[0037] Combination Figure 1-4 As shown, the skateboard drive component 11 includes a cylinder 12 disposed on the side of the upper mold 2 for molding the plastic chair. The power shaft of the cylinder 12 is connected to the core-pulling connecting skateboard 10. The center line of the power shaft of the cylinder 12 is parallel to the center line of the small shaft hole forming core-pulling rod 7. The small shaft hole forming core-pulling rod 7 and the plastic chair alignment groove forming core-pulling block 8 are parallel to each other.

[0038] In this embodiment, cylinder 12 is installed on the side of the upper mold 2 for molding the plastic chair. Its power shaft is fixedly connected to the core-pulling connecting slide plate 10 via a connecting block. The center line of the power shaft of cylinder 12 is parallel to the center line of the small shaft hole forming core-pulling rod 7. At the same time, the small shaft hole forming core-pulling rod 7 and the plastic chair alignment groove forming core-pulling block 8 are also parallel to each other. Cylinder 12 has the advantages of fast response speed, stable power output, and easy control. Its parallel layout design ensures that the core-pulling connecting slide plate 10 is subjected to uniform force and moves smoothly during the core-pulling process. Driven by cylinder 12, the small shaft hole forming core-pulling rod 7 and the plastic chair alignment groove forming core-pulling block 8 can be pulled out synchronously at the same speed and in the same direction, further improving the accuracy and reliability of the core-pulling movement and effectively ensuring the molding quality of the product.

[0039] The injection molded part 5 includes an injection molding main plate 13 disposed above the upper mold 2 for molding plastic chairs, and an injection tube 14 is provided at the bottom of the injection molding main plate 13.

[0040] In this embodiment, during the injection molding process, the injection molding equipment injects molten plastic into the injection main plate 13. Guided by the injection tube 14, the plastic is precisely delivered into the mold cavity, providing raw materials for the molding of the plastic chair. This structural design ensures the smoothness of the injection molding process, allowing the plastic to fill the cavity evenly and ensuring the molding effect of the plastic chair.

[0041] Combination Figure 2-3 As shown, the injection tube 14 passes through the core-pulling connecting slide plate 10, and the small shaft hole forming core-pulling rod 7 and the plastic chair alignment groove forming core-pulling block 8 are respectively staggered with the injection tube 14.

[0042] In this embodiment, the small shaft hole forming core-pulling rod 7 and the plastic chair alignment groove forming core-pulling block 8 are respectively staggered with the injection tube 14, without interfering with each other, and the structure is compact and reasonable.

[0043] Combination Figure 1-3 As shown, the core-pulling connecting slide plate 10 is provided with a plurality of limiting slide shafts 15, and the limiting slide shafts 15 extend into the upper mold 2 for molding plastic chairs.

[0044] In this embodiment, the limiting slide shaft 15 plays a precise guiding and limiting role in the movement of the core-pulling connecting slide plate 10. During the core-pulling process, the limiting slide shaft 15 restricts the movement direction of the core-pulling connecting slide plate 10, preventing it from deviating or shaking, and ensuring that the core-pulling rod 7 for forming the small shaft hole and the core-pulling block 8 for forming the plastic chair alignment groove can be accurately pulled out along the predetermined trajectory, which effectively improves the core-pulling accuracy and ensures the dimensional accuracy and surface quality of the small shaft hole and alignment groove structure of the plastic chair.

[0045] Combination Figure 1-4 As shown, a fixed side plate 16 is provided between the injection molding main plate 13 and the plastic chair molding upper mold 2, and an oil cylinder 17 is provided at the end of the plastic chair molding upper mold 2. The power shaft of the oil cylinder 17 is fixedly connected to the fixed side plate 16.

[0046] In this embodiment, a fixed side plate 16 is installed between the injection molding main plate 13 and the upper mold 2 for molding the plastic chair. The fixed side plate 16 is connected to the injection molding main plate 13 and the upper mold 2 by bolts. A hydraulic cylinder 17 is installed at the end of the upper mold 2 for molding the plastic chair. The power shaft of the hydraulic cylinder 17 is fixedly connected to the fixed side plate 16. During the injection molding process, the hydraulic cylinder 17 is activated, and its power shaft pushes the fixed side plate 16, so that the injection molding main plate 13 and the upper mold 2 for molding the plastic chair fit tightly together, forming a stable connection structure. This design can effectively resist the pressure generated by the injection of plastic during the injection molding process, prevent displacement between the injection molded part 5 and the upper mold 2, and ensure the stability of the injection molding process. The stable injection molding process provides a reliable working basis for the core pulling mechanism, which helps to improve the molding accuracy of the product and also extends the service life of the mold.

[0047] The working principle of this utility model is as follows:

[0048] The lower mold 1 of the plastic chair is placed on the injection molding machine's worktable. Then, the molding insert 3 is placed above the lower mold 1 at the corresponding position. Next, the upper mold 2 of the plastic chair is slowly lowered to close with the molding insert 3 and the lower mold 1. At this time, the auxiliary molding insert 4 in the molding insert 3 fits tightly with the lower mold 1, forming a complete plastic chair molding cavity. The injection molding equipment is connected to the injection main plate 13 in the injection molded part 5. Molten plastic is injected into the cavity through the injection tube 14. During this process, the hydraulic cylinder 17 pushes the fixed side plate 16 to firmly connect the injection main plate 13 with the upper mold 2, ensuring the stability of the mold structure during injection and preventing the mold parts from shifting due to the plastic injection pressure. This ensures that the plastic can fill the cavity evenly and stably, completing the initial molding of the plastic chair body, small shaft holes, and alignment grooves. When the plastic cools... After curing, the injection molding machine control system issues a command, and cylinder 12 starts. The power shaft of cylinder 12 drives the core-pulling connecting slide plate 10 to move. Since the small shaft hole forming core-pulling rod 7 and the plastic chair alignment groove forming core-pulling block 8 are fixed on the core-pulling connecting slide plate 10, the two are simultaneously pulled out from the small shaft hole and alignment groove structure of the plastic chair. During the core-pulling process, the limiting slide shaft 15 guides and limits the core-pulling connecting slide plate 10 to ensure that the core-pulling movement is carried out in a precise direction and to avoid the core-pulling parts from shifting and damaging the product. After the core-pulling is completed, the hydraulic cylinder 17 moves again to pull the fixed side plate 16, so that the injection molding main plate 13 is separated from the plastic chair molding upper mold 2. Finally, the molded plastic chair is ejected from the lower mold 1 by the ejection mechanism, completing the entire demolding process and realizing the efficient and automated production of plastic chairs from injection molding to demolding.

[0049] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model.

[0050] Although this article frequently uses terms such as lower mold for plastic chair molding 1, upper mold for plastic chair molding 2, molding insert 3, auxiliary molding insert 4, injection molded part 5, combined core-pulling mechanism 6, small shaft hole molding core-pulling rod 7, plastic chair alignment groove molding core-pulling block 8, core-pulling connector 9, core-pulling connecting slide plate 10, slide plate drive component 11, cylinder 12, injection molding main board 13, injection molding tube 14, limiting slide shaft 15, fixed side plate 16, and hydraulic cylinder 17, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A plastic injection molded chair mold combined core-pulling mechanism comprising a plastic chair forming lower mold (1) and a plastic chair forming upper mold (2), characterized in that, A molding insert (3) is provided between the lower mold (1) and the upper mold (2) of the plastic chair. An auxiliary molding insert (4) is provided inside the molding insert (3). When the auxiliary molding insert (4) is in contact with the lower mold (1) of the plastic chair, a complete cavity is formed. An injection molded part (5) is provided above the upper mold (2) of the plastic chair. A combined core-pulling mechanism (6) is provided between the injection molded part (5) and the upper mold (2) of the plastic chair. The combined core-pulling mechanism (6) is positioned corresponding to the molding insert (3).

2. The plastic injection molded chair mold modular core-draw mechanism of claim 1, wherein, The combined core-pulling mechanism (6) includes a plurality of small shaft hole forming core-pulling rods (7) and plastic chair alignment groove forming core-pulling blocks (8) disposed between the injection molded part (5) and the upper mold (2) for molding the plastic chair. The small shaft hole forming core-pulling rods (7) and plastic chair alignment groove forming core-pulling blocks (8) are arranged alternately.

3. The plastic injection molded chair mold modular core-draw mechanism of claim 2, wherein, The injection molded part (5) is provided with a core-pulling connector (9) below it. The small shaft hole forming core-pulling rod (7) and the plastic chair alignment groove forming core-pulling block (8) are respectively fixedly connected to the core-pulling connector (9).

4. The plastic injection molded chair mold modular core-draw mechanism of claim 3, wherein, The core-pulling connector (9) includes a core-pulling connecting slide plate (10) disposed below the injection molded part (5), and the small shaft hole forming core-pulling rod (7) and the plastic chair alignment groove forming core-pulling block (8) are respectively fixedly connected to the core-pulling connecting slide plate (10).

5. The plastic injection molded chair mold modular core-draw mechanism of claim 4, wherein, The upper mold (2) for molding the plastic chair is provided with a skateboard drive component (11) on its side, and the skateboard drive component (11) is connected to the core-pulling connecting skateboard (10).

6. The plastic injection molded chair mold modular core-draw mechanism of claim 5, wherein, The skateboard drive component (11) includes a cylinder (12) disposed on the side of the upper mold (2) for molding the plastic chair. The power shaft of the cylinder (12) is connected to the core-pulling connecting skateboard (10). The center line of the power shaft of the cylinder (12) is parallel to the center line of the small shaft hole forming core-pulling rod (7). The small shaft hole forming core-pulling rod (7) and the plastic chair alignment groove forming core-pulling block (8) are parallel to each other.

7. A plastic injection molded chair mold modular core-draw mechanism according to claim 4 or 5 or 6, characterized in that, The injection molded part (5) includes an injection main board (13) disposed above the upper mold (2) for molding plastic chairs, and an injection tube (14) is provided at the bottom of the injection main board (13).

8. The plastic injection molded chair mold modular core-draw mechanism of claim 7, wherein, The injection tube (14) passes through the core-pulling connecting slide plate (10), and the small shaft hole forming core-pulling rod (7) and the plastic chair alignment groove forming core-pulling block (8) are respectively staggered with the injection tube (14).

9. The plastic injection molded chair mold modular core-draw mechanism of claim 4, wherein, The core-pulling connecting slide plate (10) is provided with a plurality of limiting slide shafts (15), and the limiting slide shafts (15) extend into the upper mold (2) for molding plastic chairs.

10. The plastic injection molded chair mold modular core-draw mechanism of claim 7, wherein, A fixed side plate (16) is provided between the injection molding main board (13) and the plastic chair molding upper mold (2). A hydraulic cylinder (17) is provided at the end of the plastic chair molding upper mold (2). The power shaft of the hydraulic cylinder (17) is fixedly connected to the fixed side plate (16).

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