Chair leg punching-free core-pulling mechanism of plastic chair mold

Abstract

The utility model belongs to the technical field of molds, and particularly relates to a chair leg punching-free core-pulling mechanism of a plastic chair 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 chair leg punching-free core-pulling structure is matched with a chair leg molding space formed after the chair leg lower part molding surface and the chair leg upper part molding surface are subjected to mold closing, a hole groove structure used for mounting a foot pad at the bottom of the chair leg is synchronously molded during injection molding, and after injection molding is completed, mold opening is performed, the chair leg punching-free core-pulling structure is moved to one end far away from a plastic part firstly, and then the chair leg punching-free core-pulling structure is moved to the other end far away from the plastic part; the chair leg punching-free core-pulling structure is arranged on the plastic chair leg punching-free core-pulling structure, core pulling is achieved, the limiting piece can achieve stroke limiting on the chair leg punching-free core-pulling structure, the chair leg punching-free core-pulling structure is prevented from being separated from a plastic chair forming lower mold, then a formed plastic part is subjected to direct-ejection demolding through the middle direct-ejection piece, secondary punching treatment does not need to be conducted on a foot pad mounting hole of a chair leg after injection molding is completed, the working procedure is shortened, and the production efficiency is improved. And meanwhile, demolding of the plastic part cannot be affected, and practicability is high.

Description

TECHNICAL FIELD

[0001] The utility model belongs to mould technical field relates to a kind of chair foot of plastic chair mould exempt from punching core-pulling mechanism. BACKGROUND

[0002] Plastic chair is widely used in daily life due to light material, multiple application scenarios. Plastic chair is mainly formed by injection molding through injection molding mold. Since the whole plastic chair is made of plastic material, the bottom of the chair leg is prone to wear or damage when in use. Therefore, a foot pad is installed at the bottom of the chair leg to protect and reduce noise. In the existing plastic chair mold, it is difficult to form the hole groove structure for installing the foot pad at the bottom of the chair leg during injection molding. Secondary punching is required after injection molding. If a core-pulling structure is installed, it will affect the overall demolding of the plastic part. Therefore, it is urgent to design a chair foot of plastic chair mold exempt from punching core-pulling mechanism that can overcome the above defects.

[0003] In order to overcome the deficiencies of the prior art, people have continuously explored and proposed various solutions. For example, a plastic chair mold stripping mechanism is disclosed in Chinese patent [application number: 200920113299.6], which includes a cavity, a movable mold and a core. The mold cavity is formed between the cavity, movable mold and core. The cavity has a gate and a hot runner. The hot runner opening is provided with a hot runner plate and a hot runner pressing plate. The hot runner pressing plate has a positioning ring. The core is provided with an oil cylinder. The mold cavity is provided with an ejection block. The oil injection hole of the oil cylinder cooperates with the ejection block. The core is provided with a gate insert. The gate insert cooperates with the hot runner nozzle at an inclined surface. The ejection block contacts the gate insert. Utility model content

[0004] The utility model aims at the above problem, and provides a kind of chair foot of plastic chair mould exempt from punching core-pulling mechanism.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The chair leg non-punching core-pulling mechanism of the plastic chair mold comprises a plastic chair forming lower mold and a plastic chair forming upper mold, the plastic chair forming lower mold is internally provided with a chair body lower forming surface and a chair leg lower forming surface, the plastic chair forming upper mold is internally provided with a chair body upper forming surface and a chair leg upper forming surface, the chair body lower forming surface is oppositely arranged with the chair body upper forming surface, and the chair leg lower forming surface is oppositely arranged with the chair leg upper forming surface, a chair leg non-punching core-pulling structure capable of reciprocating linearly in a horizontal direction is arranged between the plastic chair forming lower mold and the plastic chair forming upper mold, the chair leg non-punching core-pulling structure is oppositely arranged with the chair leg forming space after the chair leg lower forming surface and the chair leg upper forming surface are combined, the plastic chair forming lower mold is provided with a limiting piece for limiting the moving stroke of the chair leg non-punching core-pulling structure, a middle straight lifting piece is arranged below the plastic chair forming lower mold, and an injection molding piece is arranged above the plastic chair forming upper mold.

[0007] In the chair leg non-punching core-pulling mechanism of the plastic chair mold, the chair leg non-punching core-pulling structure comprises two sliding seats arranged between the plastic chair forming lower mold and the plastic chair forming upper mold, the head of the sliding seat is provided with a chair leg hole forming shaft extending into the chair leg forming space, and the plastic chair forming upper mold is provided with a connecting slide rod extending into the sliding seat and being in sliding cooperation with the sliding seat.

[0008] In the chair leg non-punching core-pulling mechanism of the plastic chair mold, the limiting piece comprises a limiting table arranged on the side of the plastic chair forming lower mold, and the limiting table has an L-shaped cross section.

[0009] In the chair leg non-punching core-pulling mechanism of the plastic chair mold, a limiting channel is formed between the limiting table and the sliding seat.

[0010] In the chair leg non-punching core-pulling mechanism of the plastic chair mold, a sliding seat anti-warping and downward pressing piece is arranged on the plastic chair forming lower mold, and the two sides of the sliding seat are in sliding cooperation with the sliding seat anti-warping and downward pressing piece.

[0011] In the chair leg non-punching core-pulling mechanism of the plastic chair mold, the sliding seat anti-warping and downward pressing piece comprises a sliding seat anti-warping pressing plate arranged on the plastic chair forming lower mold, and the sliding seat anti-warping pressing plate is fixedly connected with the plastic chair forming lower mold through bolts.

[0012] In the chair leg non-punching core-pulling mechanism of the plastic chair mold, a plurality of chair body hole forming rods are arranged in the chair body lower forming surface.

[0013] In the chair leg non-punching core-pulling mechanism of the plastic chair mold, the middle straight lifting piece comprises a straight lifting rod fixing plate arranged below the plastic chair forming lower mold, a plurality of straight lifting rods are fixed on the straight lifting rod fixing plate, and the straight lifting rods are arranged alternately with the chair body hole forming rods.

[0014] In the chair leg non-perforation core-pulling mechanism of the plastic chair mold, the plastic chair forming lower mold has an injection flow channel communicated with a lower chair body forming surface, and the bottom of the injection flow channel is provided with a waste ejection rod.

[0015] In the chair leg non-perforation core-pulling mechanism of the plastic chair mold, the injection part is arranged above the plastic chair forming upper mold.

[0016] Compared with the prior art, the plastic chair mold has the advantages that:

[0017] 1、The plastic chair mold is characterized in that, in the injection molding process, the plastic chair forming lower mold and the plastic chair forming upper mold are moved close to each other, so that the lower chair body forming surface and the upper chair body forming surface are arranged opposite to each other to form a chair body structure, the lower chair leg forming surface and the upper chair leg forming surface are arranged opposite to each other to form a chair leg structure, the chair leg non-perforation core-pulling structure cooperates with the chair leg forming space after the lower chair leg forming surface and the upper chair leg forming surface are combined to form a mold, and the molten material is injected into the cavity through the injection part to synchronously form a hole and groove structure for installing a foot pad at the bottom of the chair leg during injection molding.

[0018] 2、The sliding seat anti-warping pressing plate plays a role in pressing down the sliding seat during the sliding process of the sliding seat, so that the sliding seat is prevented from being warped upward and deviated in angle during the sliding process, and the accuracy of core pulling is improved.

[0019] Other advantages, objects, and features of the present application will become apparent to those skilled in the art from the following description, which is to be read in connection with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 is a structural schematic view of the present application.

[0021] Fig. 2 is a partial structural schematic view of the present application.

[0022] Fig. 3 is a partial structural schematic view of the present application in another direction.

[0023] Fig. 4 is a structural schematic view of the plastic chair forming upper mold.

[0024] In the figure: plastic chair molding lower mold 1, plastic chair molding upper mold 2, chair body lower molding surface 3, chair leg lower molding surface 4, chair body upper molding surface 5, chair leg upper molding surface 6, chair leg punch-free core-pulling structure 7, limiter 8, middle straight ejector 9, injection molded part 10, sliding seat 11, chair leg hole molding shaft 12, limiter 13, sliding seat anti-warping pressing part 14, sliding seat anti-warping pressure plate 15, chair body hole molding rod 16, straight ejector fixing plate 17, straight ejector 18, injection molding runner 19, waste ejector rod 20, injection molding main board 21, connecting slide 100. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] like Figs. 1-4 As shown, a punch-free core-pulling mechanism for the chair legs of a plastic chair mold comprises a plastic chair molding lower mold 1 and a plastic chair molding upper mold 2. The plastic chair molding lower mold 1 is provided with a chair body lower molding surface 3 and a chair leg lower molding surface 4. The plastic chair molding upper mold 2 is provided with a chair body upper molding surface 5 and a chair leg upper molding surface 6. The chair body lower molding surface 3 is arranged opposite to the chair body upper molding surface 5, and the chair leg lower molding surface 4 is arranged opposite to the chair leg upper molding surface 6. The plastic chair molding lower mold 1 A chair leg punch-free core-pulling structure 7 that can move back and forth in a horizontal linear direction is provided between the plastic chair molding upper mold 2. The chair leg punch-free core-pulling structure 7 is arranged opposite to the chair leg molding space after the chair leg lower molding surface 4 and the chair leg upper molding surface 6 are molded together. A limit part 8 is provided on the side of the plastic chair molding lower mold 1 for limiting the moving stroke of the chair leg punch-free core-pulling structure 7. A middle straight top part 9 is provided below the plastic chair molding lower mold 1, and an injection molded part 10 is provided 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, so that the lower molding surface 3 of the chair body is arranged opposite to the upper molding surface 5 of the chair body to form the chair body structure, the lower molding surface 4 of the chair leg is arranged opposite to the upper molding surface 6 of the chair leg to form the chair leg structure, and the chair leg punch-free core-pulling structure 7 cooperates with the chair leg molding space after the lower molding surface 4 and the upper molding surface 6 of the chair leg are molded together. The molten material is injected into the mold cavity through the injection molded part 10, and the bottom of the chair leg is simultaneously molded during the injection molding. The hole and groove structure for installing the foot pads is used. After the injection molding is completed, the mold is opened. First, the chair leg punch-free core-pulling structure 7 is moved away from one end of the plastic part to realize core pulling. The limiter 8 can limit the stroke of the chair leg punch-free core-pulling structure 7 to prevent the chair leg punch-free core-pulling structure 7 from being separated from the plastic chair molding lower mold 1, and then the molded plastic part is demoulded by the middle straight top piece 9. This mold does not require secondary punching of the chair leg foot pad installation holes after the injection molding is completed, which shortens the process and does not affect the demoulding of the plastic part. It is very practical.

[0028] Combination Figs. 1-4 As shown in the figure, the chair leg hole core-pulling structure 7 comprises two sliding seats 11 arranged between the lower mold 1 and the upper mold 2 of the plastic chair forming, the head of the sliding seat 11 is provided with a chair leg hole forming shaft 12 extending into the chair leg forming space, and the upper mold 2 of the plastic chair forming is provided with a connecting slide bar 100 extending into the sliding seat 11 and slidingly matched with the sliding seat 11.

[0029] Specifically, in the injection molding process, the chair leg hole forming shaft 12 is matched with the chair leg forming space, and the hole groove structure at the bottom of the chair leg for installing the foot pad can be synchronously formed. After the injection molding is completed, the mold is opened, the sliding seat 11 is driven to move the chair leg hole forming shaft 12 away from the end of the plastic part, the core-pulling is realized, and the connecting slide bar 100 mainly plays a positioning role for the sliding seat 11 during mold clamping, so that the sliding seat 11 does not slide during injection molding, and the stability and accuracy are high.

[0030] The limiting part 8 comprises a limiting table 13 arranged on the side of the lower mold 1 of the plastic chair forming, the cross section of the limiting table 13 is L-shaped, and the limiting channel is formed between the limiting table 13 and the sliding seat 11.

[0031] In the embodiment, the limiting channel formed between the limiting table 13 and the sliding seat 11 can limit the stroke of the sliding seat 11 during the core-pulling sliding process of the sliding seat 11, so that the sliding seat 11 does not separate from the lower mold 1 of the plastic chair forming.

[0032] The lower mold 1 of the plastic chair forming is provided with a slide anti-warping down pressing part 14, and the two sides of the sliding seat 11 are slidingly matched with the slide anti-warping down pressing part 14.

[0033] In the embodiment, the slide anti-warping down pressing part 14 plays a role of pressing down the sliding seat 11 during the sliding process of the sliding seat 11, so that the sliding seat 11 does not warp upward and the angle deviates during the sliding process, and the accuracy of the core-pulling is improved.

[0034] Combination Figs. 2-3 As shown in the figure, the slide anti-warping down pressing part 14 comprises a slide anti-warping pressing plate 15 arranged on the lower mold 1 of the plastic chair forming, and the slide anti-warping pressing plate 15 and the lower mold 1 of the plastic chair forming are fixedly connected through bolts.

[0035] In the embodiment, the slide anti-warping pressing plate 15 plays a role of pressing down the sliding seat 11 during the sliding process of the sliding seat 11, so that the sliding seat 11 does not warp upward and the angle deviates during the sliding process, and the accuracy of the core-pulling is improved. The slide anti-warping pressing plate 15 and the lower mold 1 of the plastic chair forming are fixedly connected through bolts, and the disassembly and assembly are simple and convenient.

[0036] The chair body hole forming rod 16 is arranged in the lower part of the chair body forming surface 3.

[0037] In this embodiment, during the injection molding process, the chair body hole forming rod 16 can simultaneously form the hole groove structure in the middle portion of the chair body.

[0038] Combine Figs. 1-4 As shown, the middle straight push piece 9 includes a straight push rod fixing plate 17 arranged below the plastic chair forming lower mold 1, and a plurality of straight push rods 18 are fixed on the straight push rod fixing plate 17. The straight push rods 18 are staggered with the chair body hole forming rods 16.

[0039] In this embodiment, after the injection molding is completed, the mold is opened, and the straight ejector fixing plate 17 is moved upward, driving the straight ejector 18 to move upward synchronously, and the molded plastic part is ejected from the mold by the straight ejector 18.

[0040] Combine Figs. 1-2 As shown, the plastic chair molding lower mold 1 has an injection channel 19 connected to the lower molding surface 3 of the chair body, and a waste ejection rod 20 is provided at the bottom of the injection channel 19. The injection molded part 10 includes an injection main board 21 arranged above the plastic chair molding upper mold 2.

[0041] In this embodiment, the molten material is injected into the injection channel 19 through the injection main board 21, and then flows into the mold cavity. After the injection molding is completed, the cooled residual material located in the injection channel 19 can be ejected through the waste ejection rod 20 to prevent the material from remaining in the injection channel 19 and affecting the next injection molding.

[0042] The working principle of this utility model is:

[0043] 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, so that the lower molding surface 3 of the chair body is set opposite to the upper molding surface 5 of the chair body to form the chair body structure, and the lower molding surface 4 of the chair leg is set opposite to the upper molding surface 6 of the chair leg to form the chair leg structure. The molten material is injected into the injection molding flow channel 19 through the injection molding main board 21 and then flows into the mold cavity. The chair leg hole molding shaft 12 cooperates with the chair leg molding space to synchronously form the hole groove structure for installing the foot pad at the bottom of the chair leg. The chair body hole molding rod 16 The hole groove structure in the middle of the chair body can be formed synchronously. After the injection molding is completed, the mold is opened. The sliding seat 11 drives the chair leg hole forming shaft 12 to move away from the end of the plastic part to realize core pulling. The connecting slide rod 100 mainly plays a positioning role for the sliding seat 11 when the mold is closed to prevent the sliding seat 11 from sliding during injection molding. The stability and accuracy are high. During the core pulling and sliding process of the sliding seat 11, a limiting channel is formed between the limiting platform 13 and the sliding seat 11 to limit the travel of the sliding seat 11 and prevent the sliding seat 11 from separating from the plastic chair molding lower mold 1.

[0044] During the sliding of the sliding seat 11, the sliding seat anti-warping pressing plate 15 plays a role of pressing down the sliding seat 11, avoiding the sliding seat 11 from being warped and angularly deviated during the sliding, improving the accuracy of the core-pulling, the sliding seat anti-warping pressing plate 15 is fixedly connected with the plastic chair forming lower die 1 through bolts, and is simple and convenient to disassemble and assemble,

[0045] After the injection molding is completed, the straight ejector rod fixing plate 17 is moved upward, driving the straight ejector rod 18 to move upward synchronously, the straight ejector rod 18 is used for ejecting the molded plastic part, the waste ejecting rod 20 is used for ejecting the residual material cooled at the injection flow channel 19, avoiding the residual material in the injection flow channel 19, and affecting the next injection molding,

[0046] The mold does not need to perform secondary punching treatment on the foot pad mounting hole of the chair leg after the injection molding is completed, the process is shortened, meanwhile, the mold does not affect the ejection of the plastic part, and has high practicability.

[0047] The specific embodiments described in the present application are only illustrative of the spirit of the present application. Those skilled in the art to which the present application belongs can make various modifications or supplements to the described specific embodiments or use similar ways to replace, but will not deviate from the spirit of the present application.

[0048] Although the terms such as the plastic chair forming lower die 1, the plastic chair forming upper die 2, the chair body lower forming surface 3, the chair leg lower forming surface 4, the chair body upper forming surface 5, the chair leg upper forming surface 6, the chair leg punch-free core-pulling structure 7, the limiting part 8, the middle straight ejector 9, the injection molded part 10, the sliding seat 11, the chair leg hole forming shaft 12, the limiting table 13, the sliding seat anti-warping pressing part 14, the sliding seat anti-warping pressing plate 15, the chair body hole forming rod 16, the straight ejector rod fixing plate 17, the straight ejector rod 18, the injection flow channel 19, the waste ejecting rod 20, the injection main plate 21 and the connecting sliding rod 100 are used more in the present application, the possibility of using other terms is not excluded. Using these terms is only for more conveniently describing and explaining the essence of the present application, and it is contrary to the spirit of the present application to interpret them as any kind of additional limitation.

Claims

1. A plastic chair mould's chair leg punch-free core-pulling mechanism comprising a plastic chair forming lower mould (1) and a plastic chair forming upper mould (2), characterized in that, The lower mould (1) of the plastic chair forming is equipped with the lower chair body forming surface (3) and the lower chair leg forming surface (4), the upper mould (2) of the plastic chair forming is equipped with the upper chair body forming surface (5) and the upper chair leg forming surface (6), the lower chair body forming surface (3) is opposite to the upper chair body forming surface (5), the lower chair leg forming surface (4) is opposite to the upper chair leg forming surface (6), the lower mould (1) and the upper mould (2) of the plastic chair forming are equipped with the chair leg hole-punching-free core-pulling structure (7) which can move linearly along the horizontal direction, the chair leg hole-punching-free core-pulling structure (7) is opposite to the chair leg forming space after the lower chair leg forming surface (4) and the upper chair leg forming surface (6) are combined, the lower mould (1) of the plastic chair forming is equipped with the limiting part (8) for limiting the moving stroke of the chair leg hole-punching-free core-pulling structure (7), the lower mould (1) of the plastic chair forming is equipped with the middle straight top part (9), the upper mould (2) of the plastic chair forming is equipped with the injection part (10).

2. The plastic chair mold's leg punch-free core-pulling mechanism according to claim 1, characterized in that, The chair leg hole-punching-free core-pulling structure (7) comprises two sliding seats (11) arranged between the lower mould (1) and the upper mould (2) of the plastic chair forming, the head of the sliding seat (11) is equipped with the chair leg hole forming shaft (12) which extends into the chair leg forming space, the upper mould (2) of the plastic chair forming is equipped with the connecting slide rod (100) which extends into the sliding seat (11) and is in sliding cooperation with the sliding seat (11).

3. The plastic chair mold's leg punch-free core-pulling mechanism according to claim 2, characterized in that, The limiting part (8) comprises the limiting table (13) arranged on the side of the lower mould (1) of the plastic chair forming, the cross section of the limiting table (13) is L-shaped.

4. The plastic chair mold's leg hole punching-free core-pulling mechanism according to claim 3, characterized in that, The limiting channel is formed between the limiting table (13) and the sliding seat (11).

5. The plastic chair mold's leg punch-free core-pulling mechanism according to claim 4, characterized in that, The lower mould (1) of the plastic chair forming is equipped with the sliding seat anti-warping down-pressing part (14), the two sides of the sliding seat (11) are in sliding cooperation with the sliding seat anti-warping down-pressing part (14).

6. The plastic chair mold's leg hole punching and core pulling mechanism of claim 5, wherein, The sliding seat anti-warping down-pressing part (14) comprises the sliding seat anti-warping pressing plate (15) arranged on the lower mould (1) of the plastic chair forming, the sliding seat anti-warping pressing plate (15) and the lower mould (1) of the plastic chair forming are fixed by bolts.

7. The plastic chair mold's leg punch-free core-pulling mechanism according to claim 6, characterized in that, The lower chair body forming surface (3) is equipped with a plurality of chair body hole forming rods (16).

8. The plastic chair mold's leg punch-free core-pulling mechanism according to claim 7, characterized in that, The middle straight top part (9) comprises the straight top rod fixing plate (17) arranged below the lower mould (1) of the plastic chair forming, a plurality of straight top rods (18) are fixed on the straight top rod fixing plate (17), the straight top rods (18) and the chair body hole forming rods (16) are arranged alternately.

9. The plastic chair mold's leg punch-free core-drawing mechanism according to claim 8, characterized in that, The lower mould (1) of the plastic chair forming is equipped with the injection runner (19) which communicates with the lower chair body forming surface (3), the bottom of the injection runner (19) is equipped with the waste ejection rod (20).

10. The plastic chair mold's leg punch-free core-pulling mechanism according to claim 9, characterized in that, The injection part (10) comprises the injection main plate (21) arranged above the upper mould (2) of the plastic chair forming.

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