Slide block core-pulling mechanism for injection mold of legless plastic injection molding chair

Abstract

The utility model belongs to the technical field of molds, and particularly relates to a sliding block core-pulling mechanism for an injection mold of a legless plastic injection molding chair. The leg-free plastic injection molding chair forming die comprises a leg-free plastic injection molding chair forming lower die and a leg-free plastic injection molding chair forming upper die. In the injection molding process, the chair back molding surface is opposite to the chair back molding part and is used for molding a chair back structure of a plastic chair, the chair back molding surface is opposite to the chair back molding part and is used for molding a chair leg plate structure of the plastic chair, and the slide block auxiliary molding core-pulling assembly is used for assisting in molding a plastic part on one hand and plays a role in sealing the side part on the other hand; during mold opening, the sliding block auxiliary forming core-pulling assembly is pulled upwards firstly, so that one face of the cavity is opened, a worker has sufficient operation space for taking out a plastic part from the position between the plastic chair forming embedding seat and the legless plastic injection molding chair forming lower mold, and the situation that the quality of the plastic part is affected by violent demolding is avoided; and a sliding block core-pulling structure is adopted, so that the subsequent operation space is greatly increased, and the practicability is high.

Description

Technical Field

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

[0002] Plastic chairs are characterized by high production efficiency and low cost. They also boast attractive and varied appearances, vibrant colors, and suitability for fast-paced modern life, making them a widely accepted and used plastic product. Due to mold size limitations and to enhance strength, plastic chairs are often designed as legless chairs. The legs are injection-molded, fitted with inserts, and further reinforced with complex structures or metal legs to further enhance strength. However, existing injection molds for legless plastic chairs suffer from insufficient demolding space during the injection molding process due to the chair's shape, leading to potentially violent demolding and affecting part quality. Therefore, there is an urgent need to design a slider core-pulling mechanism for legless plastic chair injection molds that can overcome these shortcomings.

[0003] To overcome the shortcomings of existing technologies, people have continuously explored and proposed various solutions. For example, a Chinese patent discloses a plastic chair injection mold [application number: 202020423926.7]. After the fixed mold and moving mold are closed, a chair-shaped cavity is formed inside. An injection hole is provided on one side of the upper end of the fixed mold. A bottom mold is connected to the upper internal cavity of the fixed mold. A first hydraulic cylinder is installed inside the bottom mold. The output end of the first hydraulic cylinder is connected to a first ejector rod. The upper end of the first ejector rod extends to the upper end face of the bottom mold. A fan is provided on one side of the fixed mold. The air outlet of the fan is connected to a duct. One end of the duct is connected to an air outlet pipe. Several sets of air blowing branches are equidistantly connected to the upper side of the air outlet pipe. One end of the air blowing branches extends into the interior of the fixed mold. Several sets of one-way valves are equidistantly installed inside the fixed mold. However, this solution still lacks sufficient demolding space during the demolding process, which can easily lead to violent demolding and results in relatively poor quality of the plastic parts. Utility Model Content

[0004] The purpose of this invention is to address the above-mentioned problems by providing a slider core-pulling mechanism for injection molds of legless plastic injection-molded chairs.

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

[0006] A slider-assisted core-pulling mechanism for a legless plastic injection molded chair includes a lower mold and an upper mold for forming the legless plastic injection chair. An injection molded part is positioned above the upper mold. A plastic chair forming insert and a slider-assisted core-pulling assembly are provided between the lower and upper molds. The bottom of the plastic chair forming insert has a backrest forming portion, and a chair panel forming portion is located away from the slider-assisted core-pulling assembly. The lower mold has a backrest forming surface and a chair panel forming surface. The backrest forming surface corresponds to and is shaped with the backrest forming portion, and the chair panel forming portion corresponds to and is shaped with the chair panel forming surface. The slider-assisted core-pulling assembly slides in conjunction with the plastic chair forming insert.

[0007] In the aforementioned slider core-pulling mechanism for the injection mold of a legless plastic injection chair, the slider-assisted molding core-pulling assembly includes a side core-pulling slider disposed between the lower mold and the upper mold of the legless plastic injection chair. The bottom of the side core-pulling slider abuts against the lower mold of the legless plastic injection chair, and the top abuts against the upper mold of the legless plastic injection chair.

[0008] In the above-mentioned slider core-pulling mechanism for the injection mold of the legless plastic injection chair, the inner side of the side core-pulling slider has a slider alignment slide bar, and the plastic chair molding insert has an insert alignment sliding protrusion. The slider alignment slide bar and the insert alignment sliding protrusion slide in a sliding engagement.

[0009] In the aforementioned slider core-pulling mechanism for the injection mold of a legless plastic injection chair, the backrest forming part includes a backrest forming protrusion disposed at the bottom of the plastic chair forming insert. The backrest forming protrusion is positioned and shaped to match the backrest forming surface.

[0010] In the aforementioned slider core-pulling mechanism of the injection mold for the legless plastic injection chair, the backrest forming protrusion has several backrest anti-slip protrusion forming grooves.

[0011] In the aforementioned slider core-pulling mechanism for the injection mold of the legless plastic injection chair, the bottom sides of the plastic chair molding insert have mold closing side blocks, and the lower mold of the legless plastic injection chair has a mold closing protrusion. The mold closing side blocks and the mold closing protrusion are engaged and matched.

[0012] In the aforementioned slider core-pulling mechanism for the injection mold of a legless plastic injection chair, the chair panel forming part includes two chair panel forming protrusions disposed on the plastic chair forming insert, with the inner side of the chair panel forming protrusions facing the chair panel forming surface.

[0013] In the aforementioned sliding core-pulling mechanism for the injection mold of a legless plastic injection chair, the plastic chair molding insert has a lightweight cavity.

[0014] In the aforementioned slider core-pulling mechanism for the injection mold of a legless plastic injection chair, the plastic chair molding insert has several sliding rod holes and slots symmetrically arranged along the center line of the plastic chair molding insert.

[0015] In the aforementioned slider core-pulling mechanism for the injection mold of the legless plastic injection chair, the injection molded part includes an injection main board disposed above the upper mold of the legless plastic injection chair.

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

[0017] 1. In the injection molding process of this utility model, the lower mold and upper mold of the legless plastic injection molding chair are brought close together, the plastic chair molding insert and the slider-assisted molding core-pulling assembly abut against each other, and the molten material is injected through the injection molded part. The backrest molding surface and the backrest molding part are opposite to each other to form the backrest structure of the plastic chair, and the backrest molding surface and the backrest molding part are opposite to each other to form the leg plate structure of the plastic chair. The slider-assisted molding core-pulling assembly is used to assist in the molding of the plastic part and to seal the side to prevent leakage of molten material. After the injection molding is completed, the mold is opened by first pulling the slider-assisted molding core-pulling assembly upward to open one side of the cavity, so that the operator has sufficient operating space to remove the plastic part from between the plastic chair molding insert and the lower mold of the legless plastic injection molding chair, avoiding violent demolding that would affect the quality of the plastic part. The slider core-pulling structure greatly increases the subsequent operating space and is highly practical.

[0018] 2. The lightweight chamber in this utility model reduces the weight of the plastic chair molding insert, making it easier for staff to move the plastic chair molding insert later.

[0019] 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

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a partial structural schematic diagram of the present invention.

[0022] Figure 3 This is a schematic diagram of the lower mold for molding a legless plastic injection-molded chair.

[0023] Figure 4 This is a schematic diagram of the structure of a molded plastic chair insert.

[0024] Figure 5 This is a schematic diagram of the side core-pulling slider.

[0025] In the diagram: 1. Lower mold for legless plastic injection molding chair; 2. Upper mold for legless plastic injection molding chair; 3. Injection part; 4. Plastic chair molding insert; 5. Slider-assisted molding core-pulling assembly; 6. Chair back molding part; 7. Chair panel molding part; 8. Chair back molding surface; 9. Chair panel molding surface; 10. Side core-pulling slider; 11. Slider alignment slider part; 12. Insert alignment sliding protrusion; 13. Chair back molding protrusion; 14. Chair back anti-slip protrusion molding groove; 15. Mold closing side block; 16. Mold closing protrusion; 17. Chair panel molding protrusion; 18. Lightweight cavity; 19. Slider hole groove; 20. Injection main board. Detailed Implementation

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

[0027] like Figure 1-5 As shown, a slider core-pulling mechanism for a legless plastic injection molded chair includes a lower mold 1 and an upper mold 2 for forming a legless plastic injection chair. An injection molded part 3 is disposed above the upper mold 2. A plastic chair forming insert 4 and a slider-assisted core-pulling assembly 5 are disposed between the lower mold 1 and the upper mold 2. The bottom of the plastic chair forming insert 4 has a backrest forming part 6, and a chair panel forming part 7 is located away from the slider-assisted core-pulling assembly 5. The lower mold 1 has a backrest forming surface 8 and a chair panel forming surface 9. The backrest forming surface 8 corresponds to and is shaped with the backrest forming part 6, and the chair panel forming part 7 corresponds to and is shaped with the chair panel forming surface 9. The slider-assisted core-pulling assembly 5 slides in conjunction with the plastic chair forming insert 4.

[0028] In this embodiment, during the injection molding process, the lower mold 1 and the upper mold 2 of the legless plastic injection molding chair are brought close together, the plastic chair molding insert 4 and the slider-assisted molding core-pulling assembly 5 abut against each other, and the molten material is injected through the injection molded part 3. The chair back molding surface 8 and the chair back molding part 6 are opposite each other to form the chair back structure of the plastic chair. The chair back molding surface 8 and the chair back molding part 6 are opposite each other to form the chair leg structure of the plastic chair. The slider-assisted molding core-pulling assembly 5 is used to assist in the molding of the plastic part and to seal the side to prevent leakage of molten material. After the injection molding is completed, the mold is opened. The slider-assisted molding core-pulling assembly 5 is pulled upward to open one side of the cavity, so that the operator has sufficient operating space to remove the plastic part from between the plastic chair molding insert 4 and the lower mold 1 of the legless plastic injection molding chair, avoiding violent demolding that would affect the quality of the plastic part. The slider core-pulling structure greatly increases the subsequent operating space and is highly practical.

[0029] Combination Figure 1-5As shown, the slider-assisted molding core-pulling assembly 5 includes a side core-pulling slider 10 disposed between the lower mold 1 and the upper mold 2 of the legless plastic injection molding chair. The bottom of the side core-pulling slider 10 abuts against the lower mold 1 of the legless plastic injection molding chair, and the top abuts against the upper mold 2 of the legless plastic injection molding chair.

[0030] Specifically, during the injection molding process, the side core-pulling slider 10 serves two purposes: firstly, it assists in molding the plastic part, and secondly, it acts as a side seal to prevent leakage of molten material. After injection molding is completed and the mold is opened, the side core-pulling slider 10 is pulled upwards to open one side of the cavity, providing the operator with ample operating space to remove the plastic part from between the plastic chair molding insert 4 and the lower mold 1 of the legless plastic injection molding chair. This avoids violent demolding that could affect the quality of the plastic part. The slider core-pulling structure greatly increases the subsequent operating space and is highly practical.

[0031] The inner side of the side core-pulling slider 10 has a slider alignment slide bar 11, and the plastic chair molding insert 4 has an insert alignment sliding protrusion 12. The slider alignment slide bar 11 and the insert alignment sliding protrusion 12 are slidably engaged.

[0032] In this embodiment, during the core-pulling process, the slider alignment slide 11 and the seat alignment sliding protrusion 12 slide in cooperation to ensure that the side core-pulling slider 10 slides precisely along the prescribed trajectory, resulting in high core-pulling accuracy.

[0033] Combination Figure 3 , Figure 4 As shown, the chair back forming part 6 includes a chair back forming protrusion 13 disposed at the bottom of the plastic chair forming insert 4. The chair back forming protrusion 13 is positioned and matched with the chair back forming surface 8.

[0034] In this embodiment, during the injection molding process, the chair back forming protrusion 13 cooperates with the chair back forming surface 8 to form the chair back structure of the plastic part.

[0035] The chair back forming protrusion 13 has several chair back anti-slip forming grooves 14.

[0036] In this embodiment, during the injection molding process, the anti-slip protrusion molding groove 14 on the chair back is used to simultaneously mold the anti-slip protrusion structure on the chair back, eliminating the need for secondary processing and shortening the process.

[0037] Combination Figure 3-4 As shown, the plastic chair molding insert 4 has mold closing side blocks 15 on both sides of its bottom, and the lower mold 1 of the legless plastic injection molding chair has a mold closing protrusion 16. The mold closing side blocks 15 and the mold closing protrusion 16 are engaged and matched.

[0038] In this embodiment, during mold closing, the mold closing side block 15 and the mold closing protrusion 16 engage with each other, resulting in high mold closing accuracy.

[0039] The chair panel forming part 7 includes two chair panel forming protrusions 17 disposed on the plastic chair forming insert 4, and the inner side of the chair panel forming protrusions 17 is disposed opposite to the chair panel forming surface 9.

[0040] In this embodiment, during the injection molding process, the inner side of the chair panel forming protrusion 17 mates with the chair panel forming surface 9 to form the chair leg structure of the plastic chair.

[0041] Combination Figure 1-4 As shown, the plastic chair molding insert 4 has a lightweight chamber 18 inside.

[0042] In this embodiment, the lightweight chamber 18 reduces the weight of the plastic chair molding insert 4, making it easier for staff to move the plastic chair molding insert 4 in the future.

[0043] Combination Figure 1-4 As shown, the plastic chair molding insert 4 has a plurality of slide bar slots 19 symmetrically arranged along the center line of the plastic chair molding insert 4.

[0044] In this embodiment, the slide bar slot 19 cooperates with the slide bar to play a guiding role.

[0045] Combination Figure 1 As shown, the injection molded part 3 includes an injection main board 20 disposed above the upper mold 2 for forming a legless plastic injection chair.

[0046] In this embodiment, during injection molding, the molten material is injected into the cavity through the injection molding main plate 20.

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

[0048] During injection molding, the lower mold 1 and upper mold 2 of the legless plastic injection molding chair are brought close together, and the plastic chair molding insert 4 and the side core-pulling slider 10 abut against each other. Molten material is injected into the cavity through the injection main plate 20. The chair back molding protrusion 13 is opposite to the chair back molding surface 8 to form the chair back structure of the plastic chair. The inner side of the chair panel molding protrusion 17 mates with the chair panel molding surface 9 to form the chair leg structure of the plastic chair. The side core-pulling slider 10 serves to assist in molding the plastic part and also acts as a side seal to prevent leakage of molten material. After injection molding is completed, the mold is opened by first pulling the side core-pulling slider 10 upwards, thereby opening one side of the cavity. This provides sufficient operating space for the operator to remove the plastic part from between the plastic chair molding insert 4 and the lower mold 1 of the legless plastic injection molding chair, avoiding violent demolding that could affect the quality of the plastic part. The slider core-pulling structure greatly increases the subsequent operating space and is highly practical.

[0049] During the core-pulling process, the slider alignment slide 11 and the seat alignment sliding protrusion 12 slide in cooperation to ensure that the side core-pulling slider 10 slides precisely along the specified trajectory, resulting in high core-pulling accuracy.

[0050] During the injection molding process, the anti-slip raised groove 14 on the chair back is used to simultaneously mold the anti-slip raised structure on the chair back, eliminating the need for secondary processing and shortening the process.

[0051] During mold closing, the mold closing side block 15 and the mold closing protrusion 16 engage with each other, resulting in high mold closing accuracy. The lightweight cavity 18 reduces the weight of the plastic chair molding insert 4, making it easier for workers to move the plastic chair molding insert 4 later. The slide bar slot 19 engages with the slide bar to provide guidance.

[0052] 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.

[0053] Although this article frequently uses terms such as 1. lower mold for legless plastic injection molding chair; 2. upper mold for legless plastic injection molding chair; 3. injection part; 4. plastic chair molding insert; 5. slider-assisted molding core-pulling assembly; 6. chair back molding part; 7. chair panel molding part; 8. chair back molding surface; 9. chair panel molding surface; 10. side core-pulling slider; 11. slider alignment slide bar; 12. insert alignment sliding protrusion; 13. chair back molding protrusion; 14. chair back anti-slip protrusion molding groove; 15. mold closing side block; 16. mold closing protrusion; 17. chair panel molding protrusion; 18. lightweight cavity; 19. slide bar hole groove; 20. injection molding main board, etc., 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 slider core-pulling mechanism for an injection mold of a legless plastic injection chair, comprising a lower mold (1) and an upper mold (2) for forming a legless plastic injection chair, characterized in that, The upper mold (2) for forming a legless plastic injection chair is provided with an injection part (3). A plastic chair molding insert (4) and a slider-assisted molding core-pulling assembly (5) are provided between the lower mold (1) and the upper mold (2) for forming a legless plastic injection chair. The bottom of the plastic chair molding insert (4) is provided with a backrest molding part (6). The plastic chair molding insert (4) has a chair board molding part (7) away from the slider-assisted molding core-pulling assembly (5). The lower mold (1) for forming a legless plastic injection chair has a backrest molding surface (8) and a chair board molding surface (9). The backrest molding surface (8) and the backrest molding part (6) are positioned and matched in shape. The chair board molding part (7) and the chair board molding surface (9) are positioned and matched in shape. The slider-assisted molding core-pulling assembly (5) is slidably engaged with the plastic chair molding insert (4).

2. The slider core-pulling mechanism for the injection mold of the legless plastic injection-molded chair according to claim 1, characterized in that, The slider-assisted molding core-pulling assembly (5) includes a side core-pulling slider (10) disposed between the lower mold (1) and the upper mold (2) of the legless plastic injection molding chair. The bottom of the side core-pulling slider (10) abuts against the lower mold (1) of the legless plastic injection molding chair, and the top abuts against the upper mold (2) of the legless plastic injection molding chair.

3. The slider core-pulling mechanism for the injection mold of the legless plastic injection-molded chair according to claim 2, characterized in that, The inner side of the side core-pulling slider (10) has a slider alignment slide bar (11), and the plastic chair molding insert (4) has an insert alignment sliding protrusion (12). The slider alignment slide bar (11) and the insert alignment sliding protrusion (12) slide in cooperation.

4. The slider core-pulling mechanism for the injection mold of the legless plastic injection-molded chair according to claim 3, characterized in that, The chair back forming part (6) includes a chair back forming protrusion (13) disposed at the bottom of the plastic chair forming insert (4). The chair back forming protrusion (13) is positioned and matched with the chair back forming surface (8).

5. The slider core-pulling mechanism for the injection mold of the legless plastic injection-molded chair according to claim 4, characterized in that, The chair back forming protrusion (13) has several chair back anti-slip protrusion forming grooves (14).

6. The slider core-pulling mechanism for the injection mold of the legless plastic injection-molded chair according to claim 5, characterized in that, The plastic chair molding insert (4) has mold closing side blocks (15) on both sides of its bottom, and the lower mold (1) for the legless plastic injection molding chair has a mold closing protrusion (16) inside, and the mold closing side blocks (15) and the mold closing protrusion (16) are engaged and matched.

7. The slider core-pulling mechanism for the injection mold of the legless plastic injection-molded chair according to claim 6, characterized in that, The chair panel forming part (7) includes two chair panel forming protrusions (17) disposed on the plastic chair forming insert (4), and the inner side of the chair panel forming protrusions (17) is disposed opposite to the chair panel forming surface (9).

8. The slider core-pulling mechanism for the injection mold of the legless plastic injection-molded chair according to claim 7, characterized in that, The plastic chair molding insert (4) has a lightweight chamber (18).

9. The slider core-pulling mechanism for the injection mold of the legless plastic injection-molded chair according to claim 8, characterized in that, The plastic chair molding insert (4) has several sliding rod holes (19) symmetrically arranged along the center line of the plastic chair molding insert (4).

10. The slider core-pulling mechanism for the injection mold of the legless plastic injection-molded chair according to claim 9, characterized in that, The injection molded part (3) includes an injection main plate (20) disposed above the upper mold (2) for forming a legless plastic injection chair.

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