Multi-cavity injection mold for child plastic dining chair accessories

Abstract

The utility model belongs to mould technical field relates to a kind of children plastic dining chair accessory one mould multi-out injection mould.The utility model, including children plastic dining chair accessory forming lower mould and children plastic dining chair accessory forming upper mould, the injection molded part is equipped on the children plastic dining chair accessory forming upper mould, the children plastic dining chair accessory forming lower mould is equipped with several dining chair accessory forming lower cavities, the children plastic dining chair accessory forming upper mould is equipped with several dining chair accessory forming upper cavities, and the dining chair accessory forming lower cavity is opposite with dining chair accessory forming upper cavity setting.The utility model is in the use process, using the layout design of the cavity of one mould multi-out, can be simultaneously formed multiple children plastic dining chair accessory, greatly improve production efficiency, reduce the production time and cost of unit product, adapt to large-scale mass production demand.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology and relates to a multi-stage injection mold for children's plastic dining chair accessories. Background Technology

[0002] As a key component of dining chairs, children's plastic high chair accessories typically require side snap-fit ​​structures and a central hollow cylinder to meet assembly and functional needs. Currently, most injection molds used to produce these accessories employ a one-mold-one-ejection design, resulting in low production efficiency and high unit production costs, making it difficult to meet the demands of large-scale mass production. Furthermore, because the side snap-fit ​​structure of children's plastic high chair accessories features an undercut feature and the central hollow cylinder is a hollow, through-hole structure, existing injection molds often experience incomplete snap-fit ​​forming and insufficient smoothness of the hollow cylinder's inner wall during molding. Moreover, traditional ejection structures easily damage the snap-fit ​​or hollow cylinder during demolding, leading to a low product yield. In addition, the current injection mold's runner design is unreasonable, easily resulting in uneven melt filling, further affecting product molding accuracy and consistency. Therefore, there is an urgent need for an injection mold for children's plastic high chair accessories that can achieve efficient, high-precision molding and smooth demolding to overcome the shortcomings of existing technologies.

[0003] To overcome the shortcomings of existing technologies, people have continuously explored and proposed various solutions. For example, Chinese patent discloses an injection molding process for children's dining chair accessories [Application No.: 201710723821.1], which includes the following steps: placing raw materials with a particle size range of 2-3mm into a hopper and vacuum heating them at a vacuum degree of 0.045-0.055MPa; heating the barrel in the injection molding system to 185-235℃ and the hot runner in the injection molding system to 185-235℃, heating the fixed mold in the injection mold to 180-230℃, and heating the moving mold to 175-225℃; adding the raw material to the barrel in step S2 and heating it to a molten state at a barrel temperature of 180-230℃; injecting the molten raw material into the mold through the hot runner for molding for 50-70s, with the temperature of both the fixed mold and the moving mold at 180-230℃; and cooling the molded plastic sheet in a cooling water tank for 40-60s. However, this solution is still prone to problems such as incomplete snap-fit ​​molding, insufficient smoothness of the inner wall of the hollow cylinder, and easy damage to the snap-fit ​​or hollow cylinder during the injection molding process, resulting in a low product qualification rate. Summary of the Invention

[0004] The purpose of this utility model is to address the above-mentioned problems by providing a multi-stage injection mold for children's plastic dining chair accessories.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A multi-stage injection mold for children's plastic dining chair accessories includes a lower mold and an upper mold. An injection molded part is positioned above the upper mold. The lower mold has several lower cavities, and the upper mold has several upper cavities. The lower and upper cavities are directly opposite each other. Each lower cavity contains a side-mounted snap-fit ​​recess and a central hollow cylinder recess. Each upper cavity contains a side-mounted snap-fit ​​protrusion and a central hollow cylinder protrusion. The side-mounted snap-fit ​​recess and protrusion correspond to each other, as do the central hollow cylinder recess and protrusion. An ejector mechanism is located below the lower mold.

[0006] In the above-mentioned injection molding of children's plastic dining chair accessories, the accessory side snap-fit ​​forming recess includes two accessory side snap-fit ​​forming grooves disposed in the lower cavity of the dining chair accessory molding, and the shape of the accessory side snap-fit ​​forming grooves matches the shape of the accessory side snap-fit ​​forming protrusions.

[0007] In the above-mentioned injection molding of children's plastic dining chair accessories, the side snap-fit ​​forming protrusion of the accessory includes two side snap-fit ​​forming protrusions set in the upper cavity of the dining chair accessory molding, and the bottom of the side snap-fit ​​forming protrusion is provided with a snap-hole forming protrusion.

[0008] In the aforementioned injection molding of children's plastic dining chair accessories, the central hollow cylinder forming recess includes a central hollow cylinder forming recess disposed in the lower cavity of the dining chair accessory molding. The central hollow cylinder forming recess is through-type, and the shape of the central hollow cylinder forming recess matches that of the central hollow cylinder forming protrusion.

[0009] In the aforementioned injection molding of children's plastic dining chair accessories, the central hollow cylinder forming protrusion includes a central hollow cylinder forming shaft disposed in the upper cavity of the dining chair accessory molding, and the central hollow cylinder forming shaft is alternately arranged with the side snap-fit ​​forming protrusion of the accessory.

[0010] In the above-mentioned injection molding of children's plastic dining chair accessories, the lower cavity of the dining chair accessory is provided with two vertical groove forming protrusions and two horizontal groove forming protrusions. The vertical groove forming protrusions are connected to the central hollow cylinder forming cavity, and the horizontal groove forming protrusions are connected to the side snap-fit ​​forming groove of the accessory.

[0011] In the above-mentioned multi-part injection mold for children's plastic dining chair accessories, the injection molded part includes an injection main board disposed above the upper mold for molding the children's plastic dining chair accessories, the upper mold for molding the children's plastic dining chair accessories is provided with an upper part of the runner, and the lower mold for molding the children's plastic dining chair accessories is provided with a lower part of the runner.

[0012] In the aforementioned injection mold for multiple parts of a children's plastic dining chair accessory, the ejection and demolding structure includes an ejector rod connecting slide plate disposed below the lower mold of the children's plastic dining chair accessory, and the ejector rod connecting slide plate is provided with a plastic ejector rod that passes through the lower mold of the children's plastic dining chair accessory.

[0013] In the aforementioned injection molding of children's plastic dining chair accessories, the ejector rod connecting slide plate is also provided with a hollow cylinder ejector rod that extends into the central hollow cylinder forming cavity.

[0014] In the aforementioned injection molding process for multiple parts of a children's plastic dining chair accessory, the hollow cylinder ejector rod and the plastic part ejector rod are parallel to each other.

[0015] Compared with existing technologies, the advantages of this utility model are: 1. In use, this utility model adopts a multi-cavity layout design with one mold, which can simultaneously mold multiple children's plastic dining chair accessories, greatly improving production efficiency, reducing the production time and cost per unit product, and adapting to the needs of large-scale mass production.

[0016] 2. This utility model designs precisely corresponding molding protrusions and concave parts for the side buckles and central hollow cylinder structure of the accessories, ensuring the molding accuracy of the key structures of the product, guaranteeing the assembly compatibility and usage stability of the accessories. At the same time, the ejection and demolding structure adopts a design that combines the ejection rod of the plastic part with the ejection rod of the hollow cylinder to achieve multi-point synchronous ejection, avoiding deformation or damage caused by uneven force on the product during demolding, and improving the product qualification 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 cross-sectional view of the present invention.

[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] Figure 5 This is a schematic diagram of the upper mold for molding children's plastic dining chair accessories.

[0023] In the diagram: 1. Lower mold for children's plastic dining chair accessories; 2. Upper mold for children's plastic dining chair accessories; 3. Injection part; 4. Lower cavity for dining chair accessories; 5. Upper cavity for dining chair accessories; 6. Side snap-fit ​​recess for accessories; 7. Central hollow cylinder recess for accessories; 8. Central hollow cylinder protrusion for accessories; 9. Ejection and demolding structure; 10. Side snap-fit ​​groove for accessories; 11. Side snap-fit ​​protrusion for accessories; 12. Snap-hole protrusion; 13. Central hollow cylinder cavity for accessories; 14. Central hollow cylinder shaft for accessories; 15. Vertical groove protrusion; 16. Horizontal groove protrusion; 17. Injection main board; 18. Upper runner; 19. Lower runner; 20. Ejector rod connecting slide plate; 21. Plastic ejector rod; 22. Hollow cylinder ejector rod. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] like Figure 1-5 As shown, a multi-stage injection mold for children's plastic dining chair accessories includes a lower mold 1 and an upper mold 2. An injection molded part 3 is positioned above the upper mold 2. The lower mold 1 contains several lower cavities 4, and the upper mold 2 contains several upper cavities 5. The lower cavities 4 and upper cavities 5 are directly opposite each other. Each lower cavity 4 contains a side-mounted snap-fit ​​recess 6 and a central hollow cylinder recess 7. Each upper cavity 5 contains a side-mounted snap-fit ​​protrusion 8 and a central hollow cylinder protrusion 9. The side-mounted snap-fit ​​recess 6 corresponds to the side-mounted snap-fit ​​protrusion 8, and the central hollow cylinder recess 7 corresponds to the central hollow cylinder protrusion 9. An ejector and demolding structure 10 is located below the lower mold 1.

[0026] In this embodiment, during the injection molding process, the upper mold 2 for molding children's plastic dining chair accessories is located directly above the lower mold 1 for molding children's plastic dining chair accessories, and the two form a closed molding space after being closed. The injection molded part 3 is fixedly installed above the upper mold 2 for receiving the molten material from the injection molding machine. Several lower cavities 4 for molding children's plastic dining chair accessories are evenly opened on the upper end face of the lower mold 1, and several upper cavities 5 for molding children's plastic dining chair accessories are correspondingly opened on the lower end face of the upper mold 2. Each lower cavity 4 for molding children's plastic dining chair accessories is directly opposite to one upper cavity 5 for molding children's plastic dining chair accessories, forming a complete accessory molding cavity. The side snap-fit ​​molding recess 6 and the central hollow cylinder molding recess 7 for molding accessories are both opened on the inner wall of the lower cavity 4 for molding children's plastic dining chair accessories. The side snap-fit ​​molding protrusion 8 and the central hollow cylinder molding protrusion 9 for molding accessories are correspondingly arranged on the inner wall of the upper cavity 5 for molding children's plastic dining chair accessories. The side snap-fit ​​recess 6 and the side snap-fit ​​protrusion 8 of the accessory are perfectly matched in position and shape. The central hollow cylinder recess 7 and the central hollow cylinder protrusion 9 are also perfectly matched in position and shape, and are used together to mold the side snap-fit ​​and central hollow cylinder structure of the accessory. The ejection demolding structure 10 is installed below the lower mold 1 of the children's plastic dining chair accessory molding, and is used to eject the product from the cavity after molding. By setting multiple facing lower cavities 4 and upper cavities 5 of the dining chair accessory molding, the molding effect of multiple products from one mold is achieved. Compared with the traditional one-mold-one-exit mold, the production efficiency is increased by a factor of two, which is consistent with the number of cavities. The precise correspondence design of the molding protrusion and recess ensures that the side snap-fit ​​and central hollow cylinder structure of the accessory are molded in one step without subsequent processing, thus improving production efficiency. The setting of the ejection demolding structure 10 solves the demolding problem of accessories with complex structures and avoids damage to the product during demolding.

[0027] Combination Figure 1-5 As shown, the accessory side snap-fit ​​forming recess 6 includes two accessory side snap-fit ​​forming grooves 11 disposed in the lower cavity 4 of the dining chair accessory forming, and the shape of the accessory side snap-fit ​​forming grooves 11 matches the shape of the accessory side snap-fit ​​forming protrusion 8.

[0028] Specifically, when the upper mold 2 and the lower mold 1 of the children's plastic dining chair parts are closed, the protruding part 8 of the side buckle is precisely embedded in the side buckle forming groove 11. The gap between the two is the forming space of the side buckle of the children's plastic dining chair parts. The two symmetrically arranged side buckle forming grooves 11 can simultaneously form the buckle structure on both sides of the parts, ensuring the symmetry and consistency of the buckle position. The precise matching of the groove and the protruding part ensures that the shape and size of the buckle meet the design requirements, and ensures the firmness of the assembly between the parts and the main body of the dining chair.

[0029] The accessory side snap-fit ​​forming protrusion 8 includes two accessory side snap-fit ​​forming protrusions 12 disposed in the upper cavity 5 of the dining chair accessory forming, and the bottom of the accessory side snap-fit ​​forming protrusion 12 is provided with a snap hole forming protrusion 13.

[0030] In this embodiment, during mold closing, the side snap-fit ​​forming protrusion 12 of the accessory is embedded into the side snap-fit ​​forming groove 11 of the accessory, and the snap-hole forming protrusion 13 simultaneously extends into the groove, cooperating with the inner wall of the groove to form the snap-hole structure on the snap-fit; after forming, as the upper mold opens, the side snap-fit ​​forming protrusion 12 and the snap-hole forming protrusion 13 simultaneously disengage from the snap-fit ​​structure, avoiding scratching the snap-fit. The side snap-fit ​​forming protrusion 12 cooperates with the groove to form the snap-fit ​​body, and the snap-hole forming protrusion 13 specifically forms the snap-hole, eliminating the need for subsequent drilling processing and simplifying the production process; the integrated design of the protrusion and the protrusion ensures the positional accuracy of the snap-hole on the snap-fit, ensuring precise docking with the snap-fit ​​mating parts during assembly.

[0031] Combination Figure 3 , Figure 5 As shown, the central hollow cylinder forming recess 7 includes a central hollow cylinder forming recess 14 disposed in the lower cavity 4 of the dining chair accessory forming. The central hollow cylinder forming recess 14 is through-type, and the shape of the central hollow cylinder forming recess 14 matches that of the central hollow cylinder forming protrusion 9.

[0032] In this embodiment, during mold closing, the central hollow cylinder forming protrusion 9 is inserted from above into the central hollow cylinder forming cavity 14, and the annular gap formed between the two is the forming space of the central hollow cylinder of the children's plastic dining chair accessory. Since the central hollow cylinder forming cavity is through-type, air retention during the molding process can be avoided, and it is also convenient for the subsequent ejection structure to extend. The through-type central hollow cylinder forming cavity 14 cooperates with the protrusion to ensure that the upper and lower through-type structure of the hollow cylinder is formed in one step, ensuring the smoothness and coaxiality of the inner wall of the hollow cylinder. The through-type design can also reduce the resistance when the molten material is filled, avoid defects such as material shortage or air bubbles, and improve the structural strength of the hollow cylinder.

[0033] The central hollow cylinder forming protrusion 9 includes a central hollow cylinder forming shaft 15 disposed in the upper cavity 5 of the dining chair accessory forming, and the central hollow cylinder forming shaft 15 is alternately arranged with the accessory side snap-fit ​​forming protrusion 12.

[0034] In this embodiment, during mold closing, the central hollow cylinder forming shaft 15 is precisely inserted into the central hollow cylinder forming cavity 14, while the two accessory side snap-fit ​​forming protrusions 12 are embedded in their corresponding grooves. The two are independent of each other within the cavity space and will not affect their respective forming structures. After forming, the two are released from the product synchronously with the upper mold, avoiding jamming with the product. The central hollow cylinder forming shaft 15 realizes the hollow structure forming of the hollow cylinder. Its staggered layout with the snap-fit ​​forming protrusions ensures that two key structures are formed simultaneously within the limited cavity space, making reasonable use of the mold space and providing a structural basis for a multi-form design. The staggered arrangement also avoids flow interference of the molten material during filling, ensuring the uniformity of filling of each forming structure.

[0035] Combination Figure 3 , Figure 5 As shown, the lower cavity 4 of the dining chair accessory is provided with two vertical groove forming protrusions 16 and two horizontal groove forming protrusions 17. The vertical groove forming protrusions 16 are connected to the central hollow cylinder forming cavity 14, and the horizontal groove forming protrusions 17 are connected to the side snap-fit ​​forming groove 11 of the accessory.

[0036] In this embodiment, the vertical groove forming protrusion 16 cooperates with the inner wall of the upper cavity 5 of the dining chair accessory to form a vertical groove on the accessory; the horizontal groove forming protrusion 17 cooperates with the inner wall of the upper cavity 5 of the dining chair accessory to form a horizontal groove on the accessory; the vertical groove and the horizontal groove are connected to the hollow cylinder forming cavity and the snap-fit ​​forming groove respectively through the protrusion and the design of the hollow cylinder forming cavity and the snap-fit ​​forming groove, so that the formed groove is seamlessly connected with the hollow cylinder and the snap-fit ​​structure. The forming of the vertical groove and the horizontal groove can enhance the structural strength of the accessory, and at the same time provide positioning guidance for the assembly of the accessory with other components; the connection design between the protrusion and the corresponding forming cavity ensures the positional accuracy of the groove and the key structure, avoids interference during assembly, and improves assembly efficiency.

[0037] The injection molded part 3 includes an injection main board 18 disposed above the upper mold 2 for molding children's plastic dining chair accessories. The upper mold 2 for molding children's plastic dining chair accessories is provided with an upper runner 19, and the lower mold 1 for molding children's plastic dining chair accessories is provided with a lower runner 20.

[0038] In this embodiment, during injection molding, after the molten material is output from the injection molding machine, it enters the upper flow channel 19 through the discharge channel of the injection molding main board 18. Then, through the diversion effect of the upper flow channel 19, it is evenly distributed to the upper cavity 5 of each dining chair accessory. At the same time, the lower flow channel 20 cooperates with the upper flow channel 19 to form a complete flow channel system, ensuring that the molten material is filled into the cavity simultaneously from both the upper and lower directions, achieving rapid and uniform filling. The setting of the injection molding main board 18 ensures a sealed connection with the injection molding machine, avoiding molten material leakage. The cooperative design of the upper and lower flow channels shortens the flow path of the molten material, reduces the temperature loss of the molten material, and ensures that the molten material maintains good fluidity during the filling process. The uniform distribution of molten material by the flow channels ensures that the filling amount of each cavity is consistent, avoiding the situation of some products lacking material and some products overflowing material, thus improving the consistency of multi-cavity products.

[0039] Combination Figure 1-5 As shown, the ejection and demolding structure 10 includes an ejector rod connecting slide plate 21 disposed below the lower mold 1 for molding children's plastic dining chair accessories, and the ejector rod connecting slide plate 21 is provided with a plastic ejector rod 22 that passes through the lower mold 1 for molding children's plastic dining chair accessories.

[0040] In this embodiment, during demolding, the external drive mechanism drives the ejector pin connecting slide plate 21 to move upward. The ejector pin connecting slide plate 21 drives all the plastic part ejector pins 22 to move upward synchronously. The top of the plastic part ejector pins 22 pushes the bottom of the product, causing the product to detach from the lower cavity 4 and the upper cavity 5 of the dining chair accessory molding. After demolding, the drive mechanism drives the ejector pin connecting slide plate 21 and the plastic part ejector pins 22 to reset, preparing for the next molding. The even arrangement of multiple plastic part ejector pins 22 realizes multi-point synchronous pushing of the bottom of the product, avoiding deformation or damage caused by uneven force on the product. The setting of the ejector pin connecting slide plate 21 ensures the synchronous movement of all plastic part ejector pins 22, improving the coordination and stability of the demolding action. The design of the plastic part ejector pins 22 penetrating through the lower mold ensures sufficient pushing stroke, allowing the product to completely detach from the cavity.

[0041] Combination Figure 1-5 As shown, the top rod connecting slide plate 21 is also provided with a hollow cylinder ejector rod 23 that extends into the central hollow cylinder forming cavity 14.

[0042] In this embodiment, during demolding, the ejector rod connecting slide plate 21 moves upward, simultaneously driving the plastic part ejector rod 22 and the hollow cylinder ejector rod 23 to move upward. The plastic part ejector rod 22 pushes the edge area of ​​the bottom of the product, and the hollow cylinder ejector rod 22 pushes the bottom of the hollow cylinder in the middle of the product. The two work together to make the product smoothly detach from the cavity. Since the hollow cylinder ejector rod 23 extends into the hollow cylinder, it can prevent the hollow cylinder from collapsing or deforming due to uneven force during demolding. The targeted design of the hollow cylinder ejector rod 23 solves the problem of easy deformation of the hollow cylinder structure during demolding, ensuring the structural integrity of the hollow cylinder. The coordinated pushing with the plastic part ejector rod 22 realizes the all-round uniform force on the product, further improving the smoothness of demolding and the product qualification rate. The matching design of the hollow cylinder ejector rod 23 and the hollow cylinder forming cavity 14 in the middle ensures that there is no interference with the inner wall of the hollow cylinder during pushing, avoiding scratching the inner wall.

[0043] Combination Figure 1-5 As shown, the hollow cylinder ejector rod 23 and the plastic part ejector rod 22 are parallel to each other.

[0044] In this embodiment, since the two are parallel to each other and have the same length, the pushing speed and pushing stroke of the hollow cylinder ejector rod 23 and the plastic part ejector rod 22 are completely synchronized under the drive of the ejector rod connecting slide plate 21, ensuring that the product always remains horizontal during the demolding process and avoiding tilting or jamming.

[0045] The working principle of this utility model is as follows: The upper mold 2 and lower mold 1 for molding children's plastic dining chair accessories are aligned and closed, and fixed by the mold locking mechanism, so that the upper cavity 5 of each dining chair accessory molding and the corresponding lower cavity 4 of the dining chair accessory molding form a closed molding cavity; at this time, the side snap-fit ​​molding protrusion 12 of the accessory is embedded into the side snap-fit ​​molding groove 11 of the accessory, the snap-hole molding protrusion 13 extends into the groove, the central hollow cylinder molding shaft 15 is inserted into the central hollow cylinder molding cavity 14, and the vertical groove molding protrusion 16 and the horizontal groove molding protrusion 17 are connected to the upper mold. The inner wall forms a groove forming space; the ejector demolding structure is in the reset state, the top of the ejector rod 22 of the plastic part is attached to the bottom of the cavity, and the top of the hollow cylinder ejector rod 23 is attached to the bottom of the central hollow cylinder forming cavity 14. The injection molding machine injects the heated and molten plastic raw material into the mold through the injection main plate 18. The molten material enters the upper runner 19 through the discharge channel of the injection main plate 18. Under the diversion action of the upper runner 19 and the lower runner 20, it is evenly distributed to each closed molding cavity; the molten material fully fills the cavity. The components, including the side snap-fit ​​protrusion 8, the side snap-fit ​​recess 6, the central hollow cylinder protrusion 9, the central hollow cylinder recess 7, the vertical groove protrusion 16, and the horizontal groove protrusion 17, are tightly fitted together to form a prototype of a children's plastic dining chair accessory with side snaps, a central hollow cylinder, vertical grooves, and horizontal grooves. After cooling, the mold locking mechanism is released, and the upper mold 2 for the children's plastic dining chair accessory opens upwards, allowing the side snap-fit ​​protrusion 12, the snap-hole protrusion 13, and the central hollow cylinder to be formed... The shaft 15 detaches from the product synchronously with the upper mold; subsequently, the external drive mechanism drives the ejector pin connecting slide plate 21 to move upward, and the ejector pin connecting slide plate 21 drives the plastic part ejector rod 22 and the hollow cylinder ejector rod 23 to move upward synchronously. The plastic part ejector rod 22 pushes the bottom edge of the product, and the hollow cylinder ejector rod 23 pushes the bottom of the hollow cylinder in the middle of the product. The two work together to eject the product from the lower cavity 4 of the dining chair accessory molding; finally, the ejected product is removed manually or by a robotic arm, the ejection demolding structure is reset, and the mold enters the next molding cycle.

[0046] 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.

[0047] Although this article frequently uses terms such as 1. lower mold for children's plastic dining chair accessories; 2. upper mold for children's plastic dining chair accessories; 3. injection molded part; 4. lower cavity for dining chair accessories; 5. upper cavity for dining chair accessories; 6. side snap-fit ​​recess for accessories; 7. central hollow cylinder recess for accessories; 8. central hollow cylinder protrusion for accessories; 9. ejection and demolding structure; 10. side snap-fit ​​groove for accessories; 11. side snap-fit ​​protrusion for accessories; 12. snap-hole protrusion; 13. central hollow cylinder cavity for accessories; 14. central hollow cylinder shaft for accessories; 15. vertical groove protrusion; 16. horizontal groove protrusion; 17. injection main board; 18. upper runner; 19. lower runner; 20. ejector pin connecting slide plate; 21. plastic part ejector pin; 22. hollow cylinder ejector pin; etc., the possibility of using other terms cannot be excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model, and interpreting them as any kind of additional limitation would be contrary to the spirit of this utility model.

Claims

1. A multi-part injection mold for children's plastic dining chair accessories, comprising a lower mold (1) and an upper mold (2) for children's plastic dining chair accessories, characterized in that, The upper mold (2) for molding children's plastic dining chair accessories is provided with an injection molded part (3). The lower mold (1) for molding children's plastic dining chair accessories is provided with several lower cavities (4) for molding dining chair accessories. The upper mold (2) for molding children's plastic dining chair accessories is provided with several upper cavities (5) for molding dining chair accessories. The lower cavity (4) for molding dining chair accessories is directly opposite to the upper cavity (5) for molding dining chair accessories. The lower cavity (4) for molding dining chair accessories is provided with a side snap-fit ​​molding recess (6) and a central hollow cylinder molding recess (7). The upper cavity (5) for molding dining chair accessories is provided with a side snap-fit ​​molding protrusion (8) and a central hollow cylinder molding protrusion (9). The side snap-fit ​​molding recess (6) for molding accessories corresponds to the side snap-fit ​​molding protrusion (8), and the central hollow cylinder molding recess (7) corresponds to the central hollow cylinder molding protrusion (9). The lower mold (1) for molding children's plastic dining chair accessories is provided with an ejector demolding structure (10).

2. The children's plastic dining chair accessory according to claim 1, characterized in that, The accessory side snap-fit ​​forming recess (6) includes two accessory side snap-fit ​​forming grooves (11) disposed in the lower cavity (4) of the dining chair accessory forming, and the shape of the accessory side snap-fit ​​forming grooves (11) matches the shape of the accessory side snap-fit ​​forming protrusion (8).

3. The children's plastic dining chair accessory according to claim 2, characterized in that, The accessory side snap-fit ​​forming protrusion (8) includes two accessory side snap-fit ​​forming protrusions (12) disposed in the upper cavity (5) of the dining chair accessory forming, and the bottom of the accessory side snap-fit ​​forming protrusion (12) is provided with a snap hole forming protrusion (13).

4. The children's plastic dining chair accessory according to claim 3, characterized in that, The central hollow cylinder forming recess (7) includes a central hollow cylinder forming recess (14) disposed in the lower cavity (4) of the dining chair accessory forming. The central hollow cylinder forming recess (14) is through-type, and the shape of the central hollow cylinder forming recess (14) matches that of the central hollow cylinder forming protrusion (9).

5. The children's plastic dining chair accessory according to claim 4, characterized in that, The central hollow cylinder forming protrusion (9) includes a central hollow cylinder forming shaft (15) disposed in the upper cavity (5) of the dining chair accessory forming, and the central hollow cylinder forming shaft (15) is alternately arranged with the accessory side snap forming protrusion (12).

6. The children's plastic dining chair accessory according to claim 5, characterized in that, The lower cavity (4) of the dining chair accessory is provided with two vertical groove forming protrusions (16) and two horizontal groove forming protrusions (17). The vertical groove forming protrusions (16) are connected to the central hollow cylinder forming cavity (14), and the horizontal groove forming protrusions (17) are connected to the side buckle forming groove (11) of the accessory.

7. The children's plastic dining chair accessory according to claim 1, characterized in that, The injection molded part (3) includes an injection main board (18) disposed above the upper mold (2) for molding children's plastic dining chair accessories. The upper mold (2) for molding children's plastic dining chair accessories is provided with an upper part flow channel (19), and the lower mold (1) for molding children's plastic dining chair accessories is provided with a lower part flow channel (20).

8. The children's plastic dining chair accessory according to claim 4, characterized in that, The ejection and demolding structure (10) includes an ejector rod connecting slide plate (21) located below the lower mold (1) for molding children's plastic dining chair accessories. The ejector rod connecting slide plate (21) is provided with a plastic ejector rod (22) that passes through the lower mold (1) for molding children's plastic dining chair accessories.

9. The children's plastic dining chair accessory according to claim 8, characterized in that, The top rod connecting slide plate (21) is also provided with a hollow cylinder ejector rod (23) that extends into the central hollow cylinder forming cavity (14).

10. The children's plastic dining chair accessory according to claim 9, characterized in that, The hollow cylinder ejector rod (23) and the plastic part ejector rod (22) are parallel to each other.

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