Child folding plastic dining chair mold

Abstract

The utility model belongs to the technical field of molds, and relates to a child folding plastic dining chair mold. The chair back forming mold comprises a chair back forming lower mold and a chair back forming upper mold, and an injection molding part is arranged above the chair back forming upper mold. In the injection molding process, molten materials are injected into the cavity through the injection molding piece, side holes of the plastic chair back can be synchronously formed through the side double-hole coaxial core pulling assembly, hole grooves with small diameters on the inner side and hole grooves with large diameters on the outer side are formed, a plurality of side hole grooves with different diameters are formed at a time, secondary machining treatment is not needed, and the production efficiency is improved. According to the injection mold, the working procedure is shortened, the production efficiency is improved, the pitched roof auxiliary forming part can synchronously form the local structure of a plastic part, after injection molding is completed, the formed plastic part is ejected out through the straight ejection demolding part and the pitched roof auxiliary forming part, and the demolding area and efficiency are greatly improved by adopting a straight and pitched roof combined ejection structure.

Description

TECHNICAL FIELD

[0001] The utility model belongs to mould technical field relates to a child folding plastic dining chair mould. BACKGROUND

[0002] The child folding plastic dining chair generally has a chair back and a chair body and a chair leg combination, wherein the chair back is generally formed by injection molding using an injection molding mold. The existing chair back injection molding mold cannot simultaneously form the small-diameter hole groove on the inner side and the large-diameter hole groove on the outer side of the product when injecting the chair back product, and thus requires secondary punching processing, which has many processes and low production efficiency. In addition, the small area of the ejection also leads to low ejection efficiency. Therefore, there is an urgent need to design a child folding plastic dining chair mold 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, Chinese patent discloses a side-carved European-style dining chair cushion inclined ejection injection mold [application number: 201821990318.9], which comprises a bottom plate, a movable die plate, a fixed die plate and an injection plate. The forming cavity is located between the movable die plate and the fixed die plate. The injection plate has an injection port. The injection port is connected with the forming cavity through an injection runner. A main body forming core is fixedly arranged on the movable die plate. One side of the main body forming core has an installation hole forming cavity. The installation part forming cavity in the shape of a ring is connected at the head and tail and surrounds the outer edge of the main body forming core. The movable die plate is also provided with at least one carved forming insert. The carved forming insert corresponds to one side of the main body forming core. The installation part forming cavity is located between the main body forming core and the carved forming insert. The carved forming cavity is located in the carved forming insert. However, when the chair back product is injected, it is still difficult to simultaneously form the small-diameter hole groove on the inner side and the large-diameter hole groove on the outer side of the product. Therefore, secondary punching processing is still required, which has the defects of many processes and low production efficiency. Utility model content

[0004] The utility model aims at the above-mentioned problem, and provides a child folding plastic dining chair mold.

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

[0006] A mold for a children's folding plastic dining chair includes a lower mold for forming the backrest and an upper mold for forming the backrest. An injection molded part is provided above the upper mold for forming the backrest. A backrest forming protrusion is provided inside the lower mold for forming the backrest, and a backrest forming cavity is provided inside the upper mold for forming the backrest. The positions of the backrest forming protrusion and the backrest forming cavity are corresponding and their shapes are matched. The two ends of the lower mold for forming the backrest are provided with side double-hole coaxial core-pulling components, which are slidably engaged with the backrest forming protrusion. A straight ejector and an inclined ejector auxiliary forming component are provided below the lower mold for forming the backrest, and the straight ejector and the inclined ejector auxiliary forming component are staggered.

[0007] In the aforementioned children's folding plastic dining chair mold, the side double-hole coaxial core-pulling assembly includes horizontal slides disposed at both ends of the lower mold for backrest forming, the horizontal slides being provided with side core-pulling rods, and the head of the side core-pulling rods being provided with core-pulling shafts.

[0008] In the aforementioned children's folding plastic dining chair mold, the diameter of the pull-out shaft is smaller than the diameter of the side pull-out rod.

[0009] In the aforementioned mold for a children's folding plastic dining chair, the lower mold for forming the chair back is provided with driving components at both ends, and the driving components are connected to a horizontal slide.

[0010] In the aforementioned mold for a children's folding plastic dining chair, the driving component includes cylinders disposed at both ends of the lower mold for forming the chair back, and the power shaft of the cylinders is connected to a horizontal slide.

[0011] In the aforementioned children's folding plastic dining chair mold, the lower mold for forming the chair back is provided with a limiting side rail plate, and the horizontal slide block is slidably engaged with the limiting side rail plate.

[0012] In the aforementioned mold for a children's folding plastic dining chair, the straight ejector includes an ejector fixing plate disposed below the lower mold for forming the chair back, and the ejector fixing plate is provided with a plurality of straight ejector rods, the straight ejector rods passing through the protrusion for forming the chair back.

[0013] In the above-mentioned children's folding plastic dining chair mold, the inclined top auxiliary molding component includes an inclined top connecting slide seat disposed on the ejection fixing plate, an inclined top rod slidably connected on the inclined top connecting slide seat, and an auxiliary molding block provided at the top of the inclined top rod, the auxiliary molding block being adapted to the shape of the chair back molding protrusion.

[0014] In the aforementioned mold for a children's folding plastic dining chair, the injection molded parts include an injection main board, an injection manifold, and an injection tube disposed above the upper mold for forming the chair back.

[0015] In the aforementioned mold for a children's folding plastic dining chair, the lower mold for forming the chair back is provided with an injection runner, and the injection tube is positioned opposite the injection runner.

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

[0017] 1. In the injection molding process, the lower mold and upper mold of the chair back are brought close together, so that the chair back forming protrusion and the chair back forming cavity abut against each other to form a complete cavity. Molten material is injected into the cavity through the injection molded part. The side holes of the plastic chair back can be formed simultaneously through the side double hole coaxial core pulling component, which is used to form the inner small diameter hole groove and the outer large diameter hole groove. Multiple side hole grooves with different diameters can be formed at one time without secondary processing, shortening the process and improving production efficiency. The inclined ejector auxiliary molding part can simultaneously form the local structure of the plastic part. After injection molding is completed, the molded plastic part is ejected through the straight ejector and the inclined ejector auxiliary molding part. The combined straight and inclined ejector ejection structure greatly improves the demolding area and efficiency.

[0018] 2. The diameter of the core-pulling shaft in this utility model is smaller than the diameter of the side core-pulling rod, which facilitates core pulling and prevents jamming.

[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 partial structural schematic diagram of another aspect of this utility model.

[0023] Figure 4 This is a schematic diagram of the upper mold for forming the chair back.

[0024] In the diagram: 1. Lower mold for chair back forming; 2. Upper mold for chair back forming; 3. Injection part; 4. Chair back forming protrusion; 5. Chair back forming cavity; 6. Side double-hole coaxial core-pulling assembly; 7. Straight ejector demolding part; 8. Angled ejector auxiliary forming part; 9. Horizontal slide; 10. Side core-pulling rod; 11. Core-pulling shaft; 12. Drive part; 13. Cylinder; 14. Limiting side rail plate; 15. Ejection fixing plate; 16. Straight ejector rod; 17. Angled ejector connecting slide; 18. Angled ejector rod; 19. Auxiliary forming block; 20. Injection main board; 21. Injection manifold; 22. Injection tube; 23. Injection manifold. Detailed Implementation

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

[0026] like Figures 1-4As shown, a mold for a children's folding plastic dining chair includes a lower mold 1 for forming the backrest and an upper mold 2 for forming the backrest. An injection molded part 3 is provided above the upper mold 2. A backrest forming protrusion 4 is provided inside the lower mold 1. A backrest forming cavity 5 is provided inside the upper mold 2. The positions of the backrest forming protrusion 4 and the backrest forming cavity 5 are corresponding and their shapes are matched. The lower mold 1 has side double-hole coaxial core-pulling components 6 at both ends. The side double-hole coaxial core-pulling components 6 are slidably engaged with the backrest forming protrusion 4. A straight ejector 7 and an inclined ejector auxiliary forming component 8 are provided below the lower mold 1. The straight ejector 7 and the inclined ejector auxiliary forming component 8 are staggered.

[0027] In this embodiment, during the injection molding process, the lower mold 1 and the upper mold 2 of the chair back are brought close to each other, so that the chair back forming protrusion 4 and the chair back forming cavity 5 abut against each other to form a complete cavity. Molten material is injected into the cavity through the injection molding part 3. The side holes of the plastic chair back can be formed simultaneously through the side double hole coaxial core pulling assembly 6, which is used to form the inner small diameter hole groove and the outer large diameter hole groove. Multiple side hole grooves with different diameters are formed at one time without secondary processing, which shortens the process and improves production efficiency. The inclined ejector auxiliary molding part 8 can simultaneously form the local structure of the plastic part. After the injection molding is completed, the molded plastic part is ejected through the straight ejector demolding part 7 and the inclined ejector auxiliary molding part 8. The straight and inclined ejector combined ejection structure greatly improves the demolding area and efficiency.

[0028] Combination Figures 1-4 As shown, the side double-hole coaxial core-pulling assembly 6 includes horizontal slides 9 disposed at both ends of the lower mold 1 for forming the chair back, and a side core-pulling rod 10 is provided on the horizontal slides 9, with a core-pulling shaft 11 at the head of the side core-pulling rod 10.

[0029] Specifically, during the injection molding process, the side core-pulling rod 10 is used to form large-diameter holes and grooves on the outer side of the plastic part, and the core-pulling shaft 11 is used to form small-diameter holes and grooves on the inner side of the plastic part. Multiple side holes and grooves of different diameters are formed at one time without secondary processing, which shortens the process and improves production efficiency. The horizontal slide 9 is used to move the side core-pulling rod 10 and the core-pulling shaft 11.

[0030] The diameter of the core-pulling shaft 11 is smaller than the diameter of the side core-pulling rod 10.

[0031] In this embodiment, the diameter of the core-pulling shaft 11 is smaller than the diameter of the side core-pulling rod 10, which facilitates core pulling and prevents jamming.

[0032] Combination Figure 2 , Figure 3 As shown, the lower mold 1 for forming the chair back is provided with driving components 12 at both ends, and the driving components 12 are connected to the horizontal slide 9.

[0033] In this embodiment, the drive unit 12 is used to drive the horizontal slide 9 to move, which has a high degree of automation.

[0034] The driving component 12 includes cylinders 13 disposed at both ends of the lower mold 1 for forming the chair back, and the power shaft of the cylinders 13 is connected to the horizontal slide 9.

[0035] In this embodiment, cylinder 13 is used to drive the horizontal slide 9 to move, which has a high degree of automation.

[0036] Combination Figure 3 As shown, the lower mold 1 for forming the chair back is provided with a limiting side rail plate 14, and the horizontal slide block 9 is slidably engaged with the limiting side rail plate 14.

[0037] In this embodiment, during the movement of the horizontal slide 9, the limiting side rail plate 14 plays a limiting role, preventing the horizontal slide 9 from shifting position during movement, and ensuring high core pulling accuracy.

[0038] The straight ejector 7 includes an ejector fixing plate 15 disposed below the lower mold 1 for forming the chair back, and the ejector fixing plate 15 is provided with a plurality of straight ejector rods 16, which pass through the chair back forming protrusion 4.

[0039] In this embodiment, the ejector plate 15 is used to fix and connect the straight ejector rod 16. After injection molding is completed, the straight ejector rod 16 is used to perform the straight ejection demolding action.

[0040] Combination Figures 1-3 As shown, the inclined top auxiliary forming component 8 includes an inclined top connecting slide 17 disposed on the ejection fixing plate 15, an inclined top rod 18 slidably connected to the inclined top connecting slide 17, and an auxiliary forming block 19 provided at the top of the inclined top rod 18, the auxiliary forming block 19 being adapted to the shape of the chair back forming protrusion 4.

[0041] In this embodiment, the inclined ejector connecting slide 17 is used to connect the inclined ejector rod 18. During injection molding, the auxiliary molding block 19 is used to assist in molding the local structure of the plastic part. After injection molding is completed, the plastic part is demolded by the inclined ejector rod 18 and the auxiliary molding block 19.

[0042] Combination Figures 1-2 As shown, the injection molded part 3 includes an injection main board 20, an injection manifold 21 and an injection tube 22 disposed above the upper mold 2 for forming the chair back. The lower mold 1 for forming the chair back is provided with an injection manifold 23, and the injection tube 22 is disposed opposite to the injection manifold 23.

[0043] In this embodiment, during injection molding, the molten material is injected into the injection manifold 23 through the injection main board 20, the injection manifold 21 and the injection tube 22, and then flows into the mold cavity through the injection manifold 23 to complete the injection molding.

[0044] The working principle of this utility model is as follows:

[0045] During injection molding, the lower mold 1 and upper mold 2 for backrest molding are brought close together, so that the backrest molding protrusion 4 abuts against the backrest molding cavity 5 to form a complete cavity. Molten material is injected into the injection manifold 23 through the injection main plate 20, injection manifold 21, and injection tube 22, and flows into the cavity through the injection manifold 23. The side core-pulling rod 10 is used to form large-diameter slots on the outer side of the plastic part, and the core-pulling shaft 11 is used to form small-diameter slots on the inner side of the plastic part. Multiple side slots of different diameters are formed at one time without secondary processing, shortening the process and improving production efficiency. The horizontal slide 9 is used to move the side core-pulling rod 10 and the core-pulling shaft 11. The diameter of the core-pulling shaft 11 is smaller than the diameter of the side core-pulling rod 10, which facilitates core pulling and prevents jamming.

[0046] Cylinder 13 is used to drive the horizontal slide 9 to move, and the degree of automation is relatively high.

[0047] During the movement of the horizontal slide 9, the limiting side rail plate 14 plays a limiting role, preventing the horizontal slide 9 from shifting position during movement, thus ensuring high core-pulling accuracy.

[0048] The ejector plate 15 is used to fix the connection to the straight ejector rod 16. After injection molding is completed, the straight ejector rod 16 is used to perform the straight ejection demolding action.

[0049] The inclined ejector connecting slide 17 is used to connect the inclined ejector rod 18. During injection molding, the auxiliary molding block 19 is used to assist in molding the local structure of the plastic part. After injection molding is completed, the plastic part is demolded by the inclined ejector rod 18 and the auxiliary molding block 19.

[0050] 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.

[0051] Although this article frequently uses terms such as 1. lower mold for backrest forming; 2. upper mold for backrest forming; 3. injection molded part; 4. backrest forming protrusion; 5. backrest forming cavity; 6. side double-hole coaxial core-pulling assembly; 7. straight ejector demolding component; 8. angled ejector auxiliary forming component; 9. horizontal slide; 10. side core-pulling rod; 11. core-pulling shaft; 12. drive component; 13. cylinder; 14. limiting side rail plate; 15. ejection fixing plate; 16. straight ejector rod; 17. angled ejector connecting slide; 18. angled ejector rod; 19. auxiliary forming block; 20. injection main plate; 21. injection manifold; 22. injection tube; 23. injection manifold, 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 mold for a children's folding plastic dining chair, comprising a lower mold (1) for forming the chair back and an upper mold (2) for forming the chair back, characterized in that, The upper mold (2) for backrest forming is provided with an injection molded part (3), the lower mold (1) for backrest forming is provided with a backrest forming protrusion (4), the upper mold (2) for backrest forming is provided with a backrest forming cavity (5), the position of the backrest forming protrusion (4) and the backrest forming cavity (5) are corresponding and their shapes are matched, the lower mold (1) for backrest forming is provided with a side double hole coaxial core pulling assembly (6) at both ends, the side double hole coaxial core pulling assembly (6) is slidably engaged with the backrest forming protrusion (4), the lower mold (1) for backrest forming is provided with a straight ejector (7) and an inclined ejector auxiliary forming part (8) below, the straight ejector (7) and the inclined ejector auxiliary forming part (8) are staggered.

2. The children's folding plastic dining chair mold according to claim 1, characterized in that, The side double-hole coaxial core-pulling assembly (6) includes horizontal slides (9) disposed at both ends of the lower mold (1) for forming the chair back, and a side core-pulling rod (10) is provided on the horizontal slide (9), and a core-pulling shaft (11) is provided at the head of the side core-pulling rod (10).

3. The children's folding plastic dining chair mold according to claim 2, characterized in that, The diameter of the core-pulling shaft (11) is smaller than the diameter of the side core-pulling rod (10).

4. The children's folding plastic dining chair mold according to claim 3, characterized in that, The lower mold (1) for forming the chair back is provided with driving components (12) at both ends, and the driving components (12) are connected to the horizontal slide (9).

5. The children's folding plastic dining chair mold according to claim 4, characterized in that, The driving component (12) includes cylinders (13) disposed at both ends of the lower mold (1) for forming the backrest, and the power shaft of the cylinders (13) is connected to the horizontal slide (9).

6. The children's folding plastic dining chair mold according to claim 5, characterized in that, The lower mold (1) for forming the chair back is provided with a limiting side rail plate (14), and the horizontal slide (9) slides in cooperation with the limiting side rail plate (14).

7. The children's folding plastic dining chair mold according to claim 6, characterized in that, The straight ejector (7) includes an ejector fixing plate (15) disposed below the lower mold (1) for forming the chair back. The ejector fixing plate (15) is provided with a plurality of straight ejector rods (16), and the straight ejector rods (16) pass through the chair back forming protrusion (4).

8. The children's folding plastic dining chair mold according to claim 7, characterized in that, The inclined top auxiliary forming component (8) includes an inclined top connecting slide (17) disposed on the ejection fixing plate (15), an inclined top rod (18) is slidably connected on the inclined top connecting slide (17), and an auxiliary forming block (19) is provided on the top of the inclined top rod (18), the auxiliary forming block (19) being adapted to the shape of the chair back forming protrusion (4).

9. The children's folding plastic dining chair mold according to claim 8, characterized in that, The injection molded part (3) includes an injection main plate (20), an injection manifold (21) and an injection tube (22) disposed above the upper mold (2) for forming the chair back.

10. The children's folding plastic dining chair mold according to claim 9, characterized in that, The lower mold (1) for forming the chair back is provided with an injection runner (23), and the injection tube (22) is positioned opposite the injection runner (23).

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