Plastic sofa chair injection mold based on integral gas-assisted technology

Abstract

The utility model belongs to mould technical field relates to a kind of based on integral type gas auxiliary technology's plastic sofa chair injection mold.The utility model, including injection mainboard, sofa chair forming inlay seat is equipped in the lower injection mainboard, and the inlay seat has moulding concave cavity in it.The utility model in use process, using integral type gas auxiliary technology, gas auxiliary pressure is evenly applied to melt, solve the problem of traditional injection shrinkage, depression, especially suitable for sofa chair curved surface modeling forming, improve product surface quality and structural stability, inlay seat gas auxiliary whole disengagement assembly realizes synchronous push, avoid the product deformation caused by step demoulding, and gas auxiliary push rod and forming inlay seat synergistic effect, reduce demoulding scratch, improve yield.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology and relates to a plastic sofa and chair injection mold based on integral gas-assisted technology. Background Technology

[0002] Plastic sofas and chairs are widely used in homes, offices, and other settings due to their lightweight, durability, and diverse designs. Its production mainly relies on injection molds, but traditional injection molds have the following problems in the production process: 1. High product defect rate: Plastic sofas and chairs are large in size and have complex structures (such as the curved shapes of the seat surface and backrest). During traditional injection molding, the melt filling is uneven, which easily leads to defects such as shrinkage marks, depressions, and warping, affecting the appearance and mechanical properties of the product; 2. Difficult demolding: After the sofa and chair are formed, they fit tightly with the mold cavity. Traditional demolding mechanisms are mostly step-by-step pushing, which can easily lead to excessive local stress on the product and deformation, especially at the transition of curved surfaces, where scratches are easily generated; 3. Low production efficiency: The cooling system of traditional molds is not reasonably designed, and uneven cooling leads to a long molding cycle. At the same time, the mold closing accuracy is insufficient, which easily leads to mold misalignment and increases the scrap rate; 4. Limitations of gas-assisted technology application: Existing gas-assisted injection molding technology is mostly used alone to improve melt filling and is not combined with the demolding mechanism, resulting in complex equipment structure, cumbersome operation, and poor coordination between gas-assisted action and demolding action, affecting production stability. Therefore, there is an urgent need to design a plastic sofa and chair injection mold based on integral gas-assisted technology that can overcome the above defects.

[0003] To overcome the shortcomings of existing technologies, people have continuously explored and proposed various solutions. For example, a Chinese patent discloses an injection mold for a rattan-like plastic sofa chair [Application No.: 202322076025.7]. This mold includes a lower template with a molding cavity. Two arc-shaped core-pulling plates (number one) are symmetrically arranged on the left and right sides of the molding cavity and inserted into it. A second arc-shaped core-pulling plate (number two) is also arranged on the rear side of the molding cavity. However, this solution still suffers from high product defect rates, difficulty in demolding, and low production efficiency during use. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a plastic sofa and chair injection mold based on integrated gas-assisted technology.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A plastic sofa chair injection mold based on integrated gas-assisted technology includes an injection main board, a sofa chair molding insert below the injection main board, a mold-closing cavity within the mold-closing cavity containing a sofa chair molding part, an integrated gas-assisted release assembly for the injection part and the insert within the injection main board, the injection part and the insert being staggered, the bottom of the injection part being connected to the sofa chair molding part, and a mold-closing alignment part within the sofa chair molding insert, the mold-closing alignment part being staggered with the sofa chair molding part.

[0006] In the aforementioned plastic sofa and chair injection mold based on integrated gas-assisted technology, the gas-assisted integral release assembly for the insert includes a lifting plate disposed within the injection main board, and the bottom of the lifting plate is provided with several gas-assisted push rods that are fixedly connected to the molded insert of the sofa and chair.

[0007] In the aforementioned plastic sofa and chair injection mold based on integrated air-assisted technology, the injection main board is provided with an air-assisted drive component for driving the lifting plate to move up and down, and the air-assisted drive component is arranged alternately with the injection molded part.

[0008] In the aforementioned plastic sofa and chair injection mold based on integrated air-assisted technology, the air-assisted drive component includes a cylinder disposed within the injection molding main board. The cylinder is fixed to the injection molding main board via a fixing screw plate, and the fixing screw plate is connected to the injection molding main board via bolts. The power shaft of the cylinder is connected to the lifting plate.

[0009] In the aforementioned injection mold for plastic sofa chairs based on integrated air-assisted technology, a support plate for supporting the cylinder is provided between the fixed screw plate and the lifting plate, and the power shaft of the cylinder passes through the support plate.

[0010] In the aforementioned plastic sofa and chair injection mold based on integrated gas-assisted technology, several fixed couplings are provided between the fixed screw plate and the support plate. One end of the fixed coupling is fixed to the fixed screw plate, and the other end is fixed to the support plate.

[0011] In the above-mentioned plastic sofa and chair injection mold based on integral gas-assisted technology, the sofa and chair molding part includes a sofa and chair molding surface disposed in the mold closing and molding cavity, and the bottom of the injection molded part is connected to the sofa and chair molding surface.

[0012] In the aforementioned plastic sofa and chair injection mold based on integrated gas-assisted technology, the injection molded part includes an injection main tube disposed on the injection main board, and the bottom of the injection main tube is connected to the molding surface of the sofa and chair.

[0013] In the aforementioned injection mold for plastic sofas and chairs based on integral gas-assisted technology, the mold closing and alignment part includes two mold closing recesses disposed within the sofa and chair molding insert.

[0014] In the aforementioned plastic sofa and chair injection mold based on integrated gas-assisted technology, the sofa and chair molding insert is provided with cooling water channels.

[0015] Compared with existing technologies, the advantages of this utility model are: 1. In use, this utility model adopts an integral gas-assisted technology, which uses gas-assisted pressure to uniformly act on the melt, solving the problems of shrinkage and depression in traditional injection molding. It is especially suitable for molding curved shapes of sofas and chairs, improving the surface quality and structural stability of the product. The gas-assisted insert is detached from the component to achieve synchronous pushing, avoiding product deformation caused by step demolding. Moreover, the gas-assisted push rod and the molding insert work together to reduce demolding scratches and improve the yield.

[0016] 2. The cooling water channel in this utility model optimizes the cooling path and shortens the molding cycle; the mold closing and alignment part improves the mold closing accuracy, reduces the risk of mold misalignment, and lowers the scrap rate.

[0017] 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

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a structural schematic diagram of another aspect of this utility model.

[0020] Figure 3 This is a partial structural schematic diagram of the present invention.

[0021] Figure 4 This is a partial structural schematic diagram of another aspect of this utility model.

[0022] In the diagram: 1. Injection main board; 2. Sofa / chair molding insert; 3. Mold closing cavity; 4. Sofa / chair molding part; 5. Injection insert gas-assisted integral release assembly; 6. Mold closing alignment part; 7. Lifting plate; 8. Gas-assisted push rod; 9. Gas-assisted drive component; 10. Cylinder; 11. Fixing screw plate; 12. Support plate; 13. Fixing coupling; 14. Sofa / chair molding surface; 15. Injection main pipe; 16. Mold closing cavity; 17. Cooling water channel; 18. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] like Figure 1-4As shown, a plastic sofa chair injection mold based on integral gas-assisted technology includes an injection main board 1, a sofa chair molding insert 2 below the injection main board 1, a mold-closing cavity 3 within the mold-closing cavity 3, a sofa chair molding part 4 within the mold-closing cavity 3, an injection molded part 5 and an insert gas-assisted integral release assembly 6 within the injection main board 1, the injection molded part 5 and the insert gas-assisted integral release assembly 6 being staggered, the bottom of the injection molded part 5 being connected to the sofa chair molding part 4, and a mold-closing alignment part 7 within the sofa chair molding insert 2, the mold-closing alignment part 7 being staggered with the sofa chair molding part 4.

[0025] In this embodiment, the injection molding main board 1 is the upper main structure of the mold. Below it, it is fitted with the sofa / chair molding insert 2 via a mold closing mechanism, forming a closed molding space. The top of the sofa / chair molding insert 2 is recessed to form a mold closing molding cavity 3. The curved structure inside the cavity constitutes the sofa / chair molding part 4, directly determining the shape of the sofa / chair. The injection molded part 5 is installed through the injection molding main board 1 along its thickness direction, and its bottom port is connected to the melt inlet of the sofa / chair molding part 4, used to inject molten plastic into the molding cavity. The insert gas-assisted release assembly 6 is also installed inside the injection molding main board 1, staggered horizontally with the injection molded part 5 to avoid interference between the melt and the gas-assisted assembly during injection. The edge area of ​​the sofa / chair molding insert 2 has a mold closing alignment part 7 (spatially staggered with the sofa / chair molding part 4). During mold closing, the alignment structure ensures precise fitting between the injection molding main board 1 and the molding insert 2. The overall structure integrates injection molding, gas-assisted molding, demolding, and alignment functions, solving the coordination problems caused by the dispersed functions of traditional molds. The staggered layout avoids component interference and improves space utilization.

[0026] Combination Figure 1-4 As shown, the gas-assisted integral disengagement assembly 6 includes a lifting plate 8 disposed in the injection-molded main plate 1, and the bottom of the lifting plate 8 is provided with several gas-assisted push rods 9 that are fixedly connected to the molded sofa seat 2.

[0027] Specifically, the core of the gas-assisted integral release assembly 6 is the lifting plate 8, which is horizontally positioned within the receiving cavity of the injection molding main plate 1 and can slide up and down vertically. Four to six gas-assisted push rods 9 are evenly distributed at the bottom of the lifting plate 8. The lower ends of the push rods pass through the through holes of the injection molding main plate 1 and are fixedly connected to the top of the sofa chair molding insert 2. When the lifting plate 8 rises, the gas-assisted push rods 9 simultaneously pull the sofa chair molding insert 2 upwards, causing the molded sofa chair to separate from the molded cavity 3. When it descends, it drives the molding insert to reset, completing the mold closing. The even distribution of multiple gas-assisted push rods 9 ensures balanced force on the molding insert, preventing cavity deformation due to excessive local force during demolding. The integral release design allows the sofa chair to separate from the cavity simultaneously, reducing friction scratches.

[0028] The injection molding main board 1 is provided with a pneumatic drive component 10 for driving the lifting plate 8 to move up and down, and the pneumatic drive component 10 is arranged alternately with the injection molding part 5.

[0029] In this embodiment, the injection molding main board 1 is equipped with a gas-assisted drive component 10, the power output end of which is connected to the lifting plate 8 to drive the lifting plate to move up and down. The gas-assisted drive component 10 and the injection molded part 5 are spatially staggered to avoid the thermal impact of the high-temperature melt on the drive component during injection molding, and at the same time to prevent the movement of the drive component from interfering with the injection channel. Independent drive ensures the stability of the lifting plate movement, and the staggered layout improves the compactness of the mold structure and extends the service life of the drive component.

[0030] Combination Figure 1 , Figure 4 As shown, the pneumatic drive component 10 includes a cylinder 11 disposed in the injection molding main board 1. The cylinder 11 is fixed to the injection molding main board 1 by a fixing screw plate 12. The fixing screw plate 12 is connected to the injection molding main board 1 by bolts. The power shaft of the cylinder 11 is connected to the lifting plate 8.

[0031] In this embodiment, the pneumatic drive component 10 uses a cylinder 11 as a power source. The cylinder 11 is horizontally fixed to the inner wall of the injection molding main board 1 via a fixing screw plate 12. The fixing screw plate 12 is a rectangular metal plate, and its edge is connected to the injection molding main board 1 via four high-strength bolts. The cylinder body of the cylinder 11 is fastened to the central area of ​​the fixing screw plate 12 via bolts. The piston rod (power shaft) end of the cylinder 11 is connected to the top center of the lifting plate 8 via a flange to achieve linear power transmission. When the cylinder 11 is ventilated, the piston rod extends and retracts, causing the lifting plate 8 to move up and down. This, in turn, controls the opening and closing of the sofa chair molding insert 2 via the pneumatic push rod 9. The cylinder drive has a fast response speed (completing one demolding action in 0.5-1s). The rigid connection of the fixing screw plate 12 ensures stable force on the cylinder and avoids positional displacement caused by long-term use.

[0032] A support plate 13 for supporting the cylinder 11 is provided between the fixed screw plate 12 and the lifting plate 8, and the power shaft of the cylinder 11 passes through the support plate 13.

[0033] In this embodiment, a support plate 13 is provided between the fixed screw plate 12 and the lifting plate 8. The support plate 13 is horizontally arranged and parallel to the fixed screw plate 12. The lower part of the cylinder body of the cylinder 11 is in contact with the upper surface of the support plate 13. The piston rod passes through the central through hole of the support plate 13 (the hole diameter is slightly larger than the piston rod diameter to ensure no friction). The support plate 13 forms a bottom support for the cylinder 11, disperses the force on the cylinder, and prevents the cylinder body from shaking when the piston rod extends and retracts.

[0034] Combination Figure 4 As shown, a plurality of fixed connecting shafts 14 are provided between the fixed screw plate 12 and the support plate 13. One end of the fixed connecting shaft 14 is fixed to the fixed screw plate 12, and the other end is fixed to the support plate 13.

[0035] In this embodiment, four fixed connecting shafts 14 are vertically arranged between the fixed screw plate 12 and the support plate 13. The two ends of the connecting shafts are respectively connected to the fixed screw plate 12 and the support plate 13 by threads (the ends are locked with nuts) to form a frame structure, which enhances the rigidity of the support structure, resists the impact force generated by the repeated movement of the cylinder, and ensures the driving accuracy.

[0036] The sofa and chair molding part 4 includes a sofa and chair molding surface 15 disposed in the molded cavity 3, and the bottom of the injection molded part 5 is connected to the sofa and chair molding surface 15.

[0037] In this embodiment, the core of the sofa chair molding part 4 is the sofa chair molding surface 15, which is the curved surface structure of the inner wall of the molded cavity 3, completely replicating the outer surface shape of the sofa chair. The bottom port of the injection molded part 5 is connected to the melt inlet of the sofa chair molding surface 15, ensuring that the molten plastic is evenly filled along the molding surface. After the melt is injected through the injection molded part 5, it flows along the sofa chair molding surface 15 and fills the molded cavity 3. Under the action of air-assisted pressure, it adheres tightly to the molding surface and forms an shape consistent with the molding surface after cooling.

[0038] Combination Figure 1-4 As shown, the injection molded part 5 includes an injection main tube 16 disposed on the injection main board 1, and the bottom of the injection main tube 16 is connected to the molding surface 15 of the sofa chair.

[0039] In this embodiment, the injection molded part 5 includes an injection main pipe 16, which is a cylindrical channel. The upper part is connected to the discharge port of the injection molding machine, and the lower part is connected to multiple melt inlets of the sofa and chair molding surface 15 through a branch flow channel (hidden in the injection main plate 1). After the molten plastic is diverted through the injection main pipe 16, it is injected into the molding surface 15 from multiple inlets at the same time, which shortens the filling time and avoids local overheating.

[0040] Combination Figure 1-2 As shown, the mold-closing alignment part 7 includes two mold-closing recesses 17 disposed within the sofa chair molding insert 2.

[0041] In this embodiment, the mold closing alignment part 7 includes two mold closing recesses 17, which are symmetrically arranged on both sides of the sofa chair molding insert 2. The corresponding position of the injection molding main board 1 is provided with a protruding alignment pin, which is inserted into the mold closing recess 17 when the mold is closed.

[0042] Combination Figure 1 As shown, the sofa chair molding base 2 is provided with cooling water channels 18.

[0043] In this embodiment, the sofa chair molding insert 2 is provided with a cooling water channel 18 inside. It is a serpentine through hole distributed along the outline of the sofa chair molding surface 15. The two ends are connected to the water inlet pipe and the water outlet pipe respectively. Cooling water flows in from the water inlet pipe, circulates along the water channel 18, absorbs the heat of the molding insert, and is discharged from the water outlet pipe, so that the molded sofa chair can be quickly cooled and shaped.

[0044] The working principle of this utility model is as follows: During mold closing, the injection main plate 1 and the sofa chair molding insert 2 close under the drive of the mold closing mechanism. The alignment pin of the mold closing alignment part 7 is inserted into the mold closing recess 17 to ensure precise fit. At this time, the lifting plate 8 of the insert gas-assisted overall release assembly 6 is in a low position, and the gas-assisted push rod 9 drives the molding insert 2 to reset. The mold closing molding cavity 3 forms a closed cavity. The molten plastic is diverted through the injection main pipe 16 of the injection part 5 and injected into the sofa chair molding surface 15 of the sofa chair molding part 4 from multiple inlets, filling the mold closing molding cavity 3. At the same time, the gas-assisted system is introduced into the cavity through the insert gas-assisted overall release assembly 6. High-pressure gas pushes the melt along its interior to fill the mold cavity, eliminating shrinkage marks. Cooling water is introduced into the cooling channel 18 to absorb heat from the mold cavity, allowing the plastic part to cool and solidify under pressure. At this time, the cylinder 11 of the gas-assisted drive component 10 is in standby mode. The fixed screw plate 12, support plate 13, and fixed coupling 14 ensure the stability of the cylinder. After cooling is completed, the cylinder 11 is vented, and the piston rod pushes the lifting plate 8 to rise. The gas-assisted push rod 9 simultaneously pulls the sofa chair molding insert 2 upward, causing the plastic part to separate from the mold forming cavity 3. After demolding is completed, the cylinder is reset, and the next production cycle begins.

[0045] 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.

[0046] Although this document frequently uses terms such as injection molding main board 1, sofa / chair molding insert 2, mold closing cavity 3, sofa / chair molding part 4, injection molded part 5, insert gas-assisted integral release assembly 6, mold closing alignment part 7, lifting plate 8, gas-assisted push rod 9, gas-assisted drive component 10, cylinder 11, fixing screw plate 12, support plate 13, fixing coupling 14, sofa / chair molding surface 15, injection main pipe 16, mold closing cavity 17, cooling water channel 18, 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 plastic sofa / chair injection mold based on integrated gas-assisted technology, comprising an injection main board (1), characterized in that, The injection molding main board (1) is provided with a sofa chair molding insert (2) below it. The sofa chair molding insert (2) has a mold closing cavity (3) and a sofa chair molding part (4) inside the mold closing cavity (3). The injection molding main board (1) is provided with an injection molded part (5) and an insert gas-assisted integral release assembly (6). The injection molded part (5) and the insert gas-assisted integral release assembly (6) are staggered. The bottom of the injection molded part (5) is connected to the sofa chair molding part (4). The sofa chair molding insert (2) is also provided with a mold closing alignment part (7). The mold closing alignment part (7) is staggered with the sofa chair molding part (4).

2. The plastic sofa and chair injection mold based on integrated gas-assisted technology according to claim 1, characterized in that, The gas-assisted detachment assembly (6) includes a lifting plate (8) disposed in the injection molding main plate (1), and the bottom of the lifting plate (8) is provided with several gas-assisted push rods (9) that are fixedly connected to the sofa chair molding insert (2).

3. The plastic sofa and chair injection mold based on integrated gas-assisted technology according to claim 2, characterized in that, The injection molding main board (1) is provided with a pneumatic drive component (10) for driving the lifting plate (8) to move up and down. The pneumatic drive component (10) and the injection molding part (5) are arranged alternately.

4. The plastic sofa and chair injection mold based on integrated gas-assisted technology according to claim 3, characterized in that, The pneumatic drive unit (10) includes a cylinder (11) disposed in the injection molding main board (1). The cylinder (11) is fixed to the injection molding main board (1) by a fixing screw plate (12). The fixing screw plate (12) is connected to the injection molding main board (1) by bolts. The power shaft of the cylinder (11) is connected to the lifting plate (8).

5. The plastic sofa and chair injection mold based on integrated gas-assisted technology according to claim 4, characterized in that, A support plate (13) for supporting the cylinder (11) is provided between the fixed screw plate (12) and the lifting plate (8), and the power shaft of the cylinder (11) passes through the support plate (13).

6. The plastic sofa and chair injection mold based on integrated gas-assisted technology according to claim 5, characterized in that, A plurality of fixed coupling shafts (14) are provided between the fixed screw plate (12) and the support plate (13). One end of the fixed coupling shaft (14) is fixed to the fixed screw plate (12), and the other end is fixed to the support plate (13).

7. The plastic sofa and chair injection mold based on integrated gas-assisted technology according to claim 1, characterized in that, The sofa chair molding part (4) includes a sofa chair molding surface (15) disposed in the molded cavity (3), and the bottom of the injection molded part (5) is connected to the sofa chair molding surface (15).

8. The plastic sofa and chair injection mold based on integrated gas-assisted technology according to claim 7, characterized in that, The injection molded part (5) includes an injection main tube (16) disposed on the injection main board (1), and the bottom of the injection main tube (16) is connected to the molding surface (15) of the sofa chair.

9. The plastic sofa and chair injection mold based on integrated gas-assisted technology according to claim 8, characterized in that, The mold alignment part (7) includes two mold closing recesses (17) disposed in the sofa chair molding insert (2).

10. The plastic sofa and chair injection mold based on integrated gas-assisted technology according to claim 1, characterized in that, The sofa chair molding base (2) is provided with a cooling water channel (18).

Images