Chair leg tilting rod type core-pulling and mold-locking mechanism of plastic chair injection mold

Abstract

The utility model belongs to the technical field of molds, and particularly relates to a chair leg tilting rod type core-pulling and mold-locking mechanism of a plastic chair injection mold. The plastic chair forming die comprises a plastic chair forming lower die and a plastic chair forming upper die. In the injection molding process, the plastic chair molding lower mold and the plastic chair molding upper mold are close to each other, the chair back molding concave cavity is matched with the chair back molding bulge to form a chair back cavity, the chair seat molding auxiliary embedding platform is matched with the chair seat molding bulge to form a chair seat cavity, and a molten material is injected into the cavities through the injection molding part; during injection molding, the chair leg tilting rod type core pulling and mold locking assembly can synchronously mold a plastic part chair leg structure and a corresponding chair leg hollow structure, after injection molding is completed, mold opening is carried out, the chair leg tilting rod type core pulling and mold locking assembly is pulled away from one side of a plastic part, rod type core pulling is carried out, after core pulling is completed, the molded plastic part is subjected to ejection demolding through the ejection demolding part, and the molded chair leg structure and the corresponding chair leg hollow structure are obtained. And the chair legs are not damaged during ejection, so that the overall quality of a plastic part is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds and relates to a chair foot tilting rod type core pulling and locking mold mechanism of a plastic chair injection mold. Background Art

[0002] Plastic chairs are generally made by one-step injection molding using plastic molds. They have the characteristics of fast processing speed, low cost, and recyclability. They are widely used in restaurants, tourist attractions, conference rooms, and homes. However, pure plastic chairs are too light to be easily tipped over or blown away by the wind during use. Therefore, it is more common to embed heavy objects in the chair legs, and the overall cost is controllable. During the injection molding process, it is difficult for the existing plastic chair injection molds to synchronously reshape the hollow structure of the chair legs, and secondary processing is required. In addition, the chair legs are easily damaged during ejection and demolding, which affects the overall quality of the plastic parts. Therefore, it is urgent to design a plastic chair injection mold leg lifter core-pulling clamping mechanism that can overcome the above defects.

[0003] In order to overcome the shortcomings of the prior art, people have proposed various solutions through continuous exploration. For example, a Chinese patent discloses a plastic chair injection mold [application number: 202321518787.1], which includes a fixed mold and a movable mold. The fixed mold and the movable mold form a chair body cavity in the shape of a chair after being combined. The fixed mold is symmetrically provided with armrest blocks and connecting inserts located on both sides of the chair body cavity. The armrest block is provided with an armrest cavity, and the armrest cavity is connected to the chair body cavity. The connecting insert is located at the connection between the chair body cavity and the armrest cavity and is detachably connected to the fixed mold. The connecting insert is used to seal the connection between the armrest cavity and the chair body cavity, or the connecting insert is provided with a connecting cavity connecting the armrest cavity and the chair body cavity. Summary of the invention

[0004] The utility model aims to solve the above problems and provides a chair leg tilting rod type core pulling and clamping mechanism for a plastic chair injection mould.

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

[0006] A plastic chair injection mold chair leg tilt rod type core pulling and locking mechanism comprises a plastic chair molding lower mold and a plastic chair molding upper mold, wherein the plastic chair molding lower mold is provided with a chair back molding protrusion and a chair seat molding protrusion, wherein the plastic chair molding upper mold is provided with a chair back molding cavity, wherein the chair back molding cavity is arranged opposite to the chair back molding protrusion, wherein a chair seat molding auxiliary insert is arranged between the plastic chair molding lower mold and the plastic chair molding upper mold, wherein the chair seat molding auxiliary insert is provided with mutually staggered chair leg tilt rod type core pulling and locking components and ejection demolding parts, wherein the chair leg tilt rod type core pulling and locking components correspond to the position of the chair seat molding protrusion, and an injection molded part is arranged above the plastic chair molding upper mold.

[0007] In the above-mentioned plastic chair injection mold chair leg lifter type core-pulling and clamping mechanism, the chair leg lifter type core-pulling and clamping assembly includes a front chair leg core-pulling molding part and a rear chair leg core-pulling molding part arranged in the chair seat molding auxiliary insert, and the front chair leg core-pulling molding part and the rear chair leg core-pulling molding part can perform reciprocating linear motion along one end close to or away from the seat molding protrusion.

[0008] In the above-mentioned plastic chair injection mold leg lifter core-pulling clamping mechanism, the front leg core-pulling molding part includes two front leg core-pulling rods arranged in the seat molding auxiliary insert, and a front leg molding space is formed between the front leg core-pulling rods and the seat molding auxiliary insert.

[0009] In the above-mentioned plastic chair injection mold chair leg tilting rod type core pulling clamping mechanism, a movable slide is provided at the tail of the front chair leg core pulling rod, and the tail of the movable slide is connected to a first linear drive.

[0010] In the above-mentioned plastic chair injection mold chair leg tilting rod core-pulling clamping mechanism, a limiting slide rail is provided in the chair seat molding auxiliary insert, and the movable slide seat is slidably matched with the limiting slide rail.

[0011] In the above-mentioned plastic chair injection mold leg lifter type core pulling and clamping mechanism, the rear leg core pulling molding part includes two rear leg core pulling rods arranged in the seat molding auxiliary insert, and a rear leg molding space is formed between the rear leg core pulling rods and the seat molding auxiliary insert.

[0012] In the above-mentioned plastic chair injection mold leg lifter core-pulling clamping mechanism, the tail of the rear leg core-pulling rod is connected to a second linear drive, and a sealing seat is provided between the second linear drive and the rear leg core-pulling rod.

[0013] In the above-mentioned plastic chair injection mold chair leg lifter core-pulling clamping mechanism, the ejection demolding part includes an ejection fixing plate arranged in the seat molding auxiliary insert, and a plurality of ejection straight rods are arranged on the ejection fixing plate.

[0014] In the above-mentioned plastic chair injection mold leg tilting rod type core-pulling clamping mechanism, the tail of the ejection fixing plate is connected to a third linear drive.

[0015] In the above-mentioned plastic chair injection mold leg tilting rod type core pulling clamping mechanism, the injection molded part includes an injection molding main board and an injection molding tube arranged above the plastic chair molding upper mold.

[0016] Compared with the existing technology, the advantages of the utility model are: during the injection molding process, the plastic chair molding lower mold and the plastic chair molding upper mold are brought close to each other, the chair back molding cavity and the chair back molding protrusion cooperate to form a chair back cavity, and the seat molding auxiliary insert cooperates with the seat molding protrusion to form a seat cavity, and the molten material is injected into the cavity through the injection molded part. During injection molding, the chair leg lift rod type core pulling and locking mold assembly can synchronously mold the plastic part chair leg structure and the corresponding chair leg hollow structure. After the injection molding is completed, the mold is opened, and the chair leg lift rod type core pulling and locking mold assembly is pulled away from the plastic part to perform rod-type core pulling. After the core pulling is completed, the molded plastic part is ejected and demolded by the ejection demolding part. The chair leg will not be damaged during ejection, thereby ensuring the overall quality of the plastic part.

[0017] Other advantages, objectives and features of the present invention will be embodied 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

[0018] Figure 1 It is a structural schematic diagram of the utility model.

[0019] Figure 2 It is a partial structural schematic diagram of the utility model.

[0020] Figure 3 It is a structural schematic diagram of a chair seat forming auxiliary inlay.

[0021] Figure 4 It is a schematic diagram of the partial structure of the auxiliary inlay for chair seat molding.

[0022] Figure 5 It is a schematic diagram of the structure of the lower mold for plastic chair molding.

[0023] Figure 6 It is a partial structural schematic diagram of the utility model in another direction.

[0024] In the figure: plastic chair molding lower mold 1, plastic chair molding upper mold 2, chair back molding protrusion 3, chair seat molding protrusion 4, chair back molding cavity 5, chair seat molding auxiliary insert 6, chair leg tilt rod type core pulling clamping assembly 7, ejection demolding part 8, injection molded part 9, front chair leg core pulling molding part 10, rear chair leg core pulling molding part 11, front chair leg core pulling rod 12, front chair leg molding space 13, movable slide 14, first linear drive 15, limiting slide rail 16, rear chair leg core pulling rod 17, rear chair leg molding space 18, second linear drive 19, sealing seat 20, ejection fixing plate 21, ejection straight rod 22, third linear drive 23, injection molding main board 24, injection molding tube 25. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with the accompanying drawings.

[0026] like Figure 1-6 As shown, a chair leg tilting rod type core pulling and locking mechanism of a plastic chair injection mold comprises a plastic chair molding lower mold 1 and a plastic chair molding upper mold 2, wherein the plastic chair molding lower mold 1 is provided with a chair back molding protrusion 3 and a chair seat molding protrusion 4, wherein the plastic chair molding upper mold 2 is provided with a chair back molding cavity 5, wherein the chair back molding cavity 5 is arranged opposite to the chair back molding protrusion 3, wherein a seat molding auxiliary insert 6 is arranged between the plastic chair molding lower mold 1 and the plastic chair molding upper mold 2, wherein the seat molding auxiliary insert 6 is provided with mutually staggered chair leg tilting rod type core pulling and locking components 7 and ejection demolding parts 8, wherein the chair leg tilting rod type core pulling and locking components 7 correspond to the position of the chair seat molding protrusion 4, and an injection molded part 9 is arranged above the plastic chair molding upper mold 2.

[0027] In this embodiment, during the injection molding process, the plastic chair molding lower mold 1 and the plastic chair molding upper mold 2 are brought close to each other, the chair back molding cavity 5 and the chair back molding protrusion 3 cooperate to form a chair back cavity, and the seat molding auxiliary insert 6 and the seat molding protrusion 4 cooperate to form a seat cavity. The molten material is injected into the cavity through the injection molding part 9. During injection molding, the chair leg lift rod type core pulling and locking mold assembly 7 can synchronously mold the plastic part chair leg structure and the corresponding chair leg hollow structure. After the injection molding is completed, the mold is opened, and the chair leg lift rod type core pulling and locking mold assembly 7 is pulled away from the plastic part to perform rod-type core pulling. After the core pulling is completed, the molded plastic part is ejected and demolded by the ejection demolding part 8. The chair leg will not be damaged during ejection, thereby ensuring the overall quality of the plastic part.

[0028] Combination Figure 1-6 As shown, the chair leg tilting rod type core pulling clamping assembly 7 includes a front chair leg core pulling molding part 10 and a rear chair leg core pulling molding part 11 which are arranged in the chair seat molding auxiliary insert 6. The front chair leg core pulling molding part 10 and the rear chair leg core pulling molding part 11 can make reciprocating linear motion along one end close to or away from the chair seat molding protrusion 4.

[0029] Specifically, during injection molding, the front chair leg core-pulling molding part 10 can simultaneously mold the front chair leg of the plastic part, and the rear chair leg core-pulling molding part 11 can simultaneously mold the rear chair leg of the plastic part, and at the same time mold the hollow structure of the chair leg. After the injection molding is completed, the mold is opened, and the front chair leg core-pulling molding part 10 and the rear chair leg core-pulling molding part 11 are pulled away from the side of the plastic part to perform rod-type core pulling to avoid jamming during demolding.

[0030] Combination Figure 2-4 As shown, the front leg core-pulling molding part 10 includes two front leg core-pulling rods 12 arranged in the seat molding auxiliary insert 6, and a front leg molding space 13 is formed between the front leg core-pulling rods 12 and the seat molding auxiliary insert 6.

[0031] In this embodiment, the front leg molding space 13 can simultaneously mold the front leg of the plastic component, and the front leg core-pulling rod 12 can mold the hollow structure of the leg.

[0032] A movable slide 14 is provided at the tail end of the front chair leg core pulling rod 12 , and a first linear drive 15 is connected to the tail end of the movable slide 14 .

[0033] In this embodiment, when the front chair leg core pulling rod 12 needs to be moved, the first linear drive 15 is started, and the movable slide 14 is driven to move by the first linear drive 15, and the degree of automation is relatively high.

[0034] Combination Figure 4 As shown, a limiting slide rail 16 is provided inside the seat forming auxiliary insert 6 , and the movable slide seat 14 is slidably matched with the limiting slide rail 16 .

[0035] In this embodiment, when the movable slide 14 moves, the limiting slide rail 16 can limit the movable slide 14 and prevent it from deflecting.

[0036] The rear leg core-pulling molding part 11 includes two rear leg core-pulling rods 17 arranged in the seat molding auxiliary inlay 6, and a rear leg molding space 18 is formed between the rear leg core-pulling rods 17 and the seat molding auxiliary inlay 6.

[0037] In this embodiment, the rear leg molding space 18 can simultaneously mold the rear leg of the plastic component, and the rear leg core-pulling rod 17 can mold the hollow structure of the leg.

[0038] The tail end of the rear chair leg core pulling rod 17 is connected to a second linear drive 19 , and a sealing seat 20 is provided between the second linear drive 19 and the rear chair leg core pulling rod 17 .

[0039] In this embodiment, when the rear chair leg core pulling rod 17 needs to be moved, the second linear drive 19 can be started, and the degree of automation is relatively high. The sealing seat 20 can prevent the leakage of molten material.

[0040] Combination Figure 4-6 As shown, the ejection demolding member 8 includes an ejection fixing plate 21 arranged in the seat molding auxiliary insert 6, and a plurality of ejection straight rods 22 are arranged on the ejection fixing plate 21. The tail of the ejection fixing plate 21 is connected to a third linear drive 23.

[0041] In this embodiment, after the injection molding is completed, the third linear drive 23 is started, and the ejection fixing plate 21 and the ejection straight rod 22 are driven by the third linear drive 23 to eject the molded plastic part in all directions, with a large ejection area and high ejection efficiency.

[0042] Combination Figure 1As shown, the injection molded part 9 includes an injection molded main board 24 and an injection molded tube 25 which are arranged above the plastic chair molding upper mold 2.

[0043] In this embodiment, during injection molding, the molten material is injected into the mold cavity through the injection molding main board 24 and the injection molding tube 25;

[0044] Those skilled in the art should understand that the first linear drive 15, the second linear drive 19, and the third linear drive 23 may be air cylinders, oil cylinders, or linear motors.

[0045] The working principle of the utility model is:

[0046] During the injection molding process, the plastic chair molding lower mold 1 and the plastic chair molding upper mold 2 are brought close to each other, the back molding cavity 5 cooperates with the back molding protrusion 3 to form a back molding cavity, the seat molding auxiliary insert 6 cooperates with the seat molding protrusion 4 to form a seat molding cavity, and the molten material is injected into the cavity through the injection molding main board 24 and the injection molding tube 25. The front chair leg molding space 13 can synchronously mold the front chair leg of the plastic part, the front chair leg core pulling rod 12 can mold the hollow structure of the chair leg, the rear chair leg molding space 18 can synchronously mold the rear chair leg of the plastic part, and the rear chair leg core pulling rod 17 can mold the hollow structure of the chair leg.

[0047] After the injection molding is completed, the mold is opened, and the front chair leg core-pulling molded part 10 and the rear chair leg core-pulling molded part 11 are pulled away from the plastic part to perform rod-type core-pulling to avoid jamming during demoulding. When the front chair leg core-pulling rod 12 needs to be moved, the first linear drive 15 is started, and the first linear drive 15 drives the movable slide 14 to move. The degree of automation is high. When the movable slide 14 moves, the limit slide rail 16 can limit the movable slide 14 and prevent it from deflecting.

[0048] When the rear leg core pulling rod 17 needs to be moved, the second linear drive 19 can be started. The degree of automation is high, and the sealing seat 20 can prevent the molten material from leaking.

[0049] After the injection molding is completed, the third linear drive 23 is started, and the ejection fixing plate 21 and the ejection straight rod 22 are driven by the third linear drive 23 to eject the molded plastic part in all directions, with a large ejection area and high ejection efficiency.

[0050] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways without departing from the spirit of the present invention.

[0051] Although this article uses more terms such as plastic chair molding lower mold 1, plastic chair molding upper mold 2, chair back molding protrusion 3, chair seat molding protrusion 4, chair back molding cavity 5, chair seat molding auxiliary insert 6, chair leg tilting rod type core-pulling clamping assembly 7, ejection demolding part 8, injection molding part 9, front chair leg core-pulling molding part 10, rear chair leg core-pulling molding part 11, front chair leg core-pulling rod 12, front chair leg molding space 13, moving slide 14, first linear drive 15, limit slide 16, rear chair leg core-pulling rod 17, rear chair leg molding space 18, second linear drive 19, sealing seat 20, ejection fixing plate 21, ejection straight rod 22, third linear drive 23, injection molding main board 24, injection molding tube 25, etc., it does not exclude the possibility of using other terms. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the utility model. It is contrary to the spirit of the utility model to interpret them as any additional restrictions.

Claims

1. A plastic chair injection mold chair leg tilting rod type core pulling clamping mechanism, comprising a plastic chair molding lower mold (1) and a plastic chair molding upper mold (2), characterized in that: The plastic chair molding lower mold (1) is provided with a back molding protrusion (3) and a seat molding protrusion (4), the plastic chair molding upper mold (2) is provided with a back molding cavity (5), the back molding cavity (5) is arranged opposite to the back molding protrusion (3), a seat molding auxiliary insert (6) is provided between the plastic chair molding lower mold (1) and the plastic chair molding upper mold (2), the seat molding auxiliary insert (6) is provided with mutually staggered chair leg tilting rod type core pulling clamping assembly (7) and ejection demolding part (8), the chair leg tilting rod type core pulling clamping assembly (7) corresponds to the position of the seat molding protrusion (4), and an injection molded part (9) is provided above the plastic chair molding upper mold (2).

2. The plastic chair leg injection mold according to claim 1, characterized in that: The chair leg tilting rod type core pulling and locking mold assembly (7) comprises a front chair leg core pulling molding part (10) and a rear chair leg core pulling molding part (11) which are arranged in the chair seat molding auxiliary insert (6); the front chair leg core pulling molding part (10) and the rear chair leg core pulling molding part (11) can perform reciprocating linear motion along one end close to or away from the chair seat molding protrusion (4).

3. The chair leg tilting rod type core-pulling clamping mechanism of the plastic chair injection mold according to claim 2 is characterized in that: The front leg core-pulling molding part (10) comprises two front leg core-pulling rods (12) arranged in the seat molding auxiliary inlay (6), and a front leg molding space (13) is formed between the front leg core-pulling rods (12) and the seat molding auxiliary inlay (6).

4. The chair leg tilting rod type core-pulling clamping mechanism of the plastic chair injection mold according to claim 3 is characterized in that: A movable slide (14) is provided at the tail of the front chair leg core pulling rod (12), and a first linear drive (15) is connected to the tail of the movable slide (14).

5. The chair leg tilting rod type core-pulling clamping mechanism of the plastic chair injection mold according to claim 4 is characterized in that: A limiting slide rail (16) is provided in the seat forming auxiliary embedding platform (6), and the movable slide seat (14) is slidably matched with the limiting slide rail (16).

6. The chair leg tilting rod type core-pulling clamping mechanism of the plastic chair injection mold according to claim 2, characterized in that: The rear leg core-pulling molding part (11) comprises two rear leg core-pulling rods (17) arranged in the seat molding auxiliary inlay (6), and a rear leg molding space (18) is formed between the rear leg core-pulling rods (17) and the seat molding auxiliary inlay (6).

7. The chair leg tilting rod type core-pulling clamping mechanism of the plastic chair injection mold according to claim 6, characterized in that: The tail of the rear chair leg core-pulling rod (17) is connected to a second linear drive (19), and a sealing seat (20) is provided between the second linear drive (19) and the rear chair leg core-pulling rod (17).

8. The chair leg tilting rod type core-pulling clamping mechanism of the plastic chair injection mold according to claim 1, characterized in that: The ejection demoulding component (8) comprises an ejection fixing plate (21) arranged in the seat forming auxiliary insert (6), and a plurality of ejection straight rods (22) are arranged on the ejection fixing plate (21).

9. The chair leg tilting rod type core-pulling clamping mechanism of the plastic chair injection mold according to claim 8, characterized in that: The tail of the ejection fixing plate (21) is connected to a third linear drive (23).

10. The chair leg tilting rod type core-pulling clamping mechanism of the plastic chair injection mold according to claim 1, characterized in that: The injection molded part (9) comprises an injection molded main board (24) and an injection molded tube (25) which are arranged above the upper mold (2) for forming a plastic chair.

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