Injection mold for a plastic basket of a multistage exhaust grid

Abstract

The utility model relates to injection mold technical field, concretely, it is related to the plastic basket injection mold of multistage exhaust grid, including lower mould and the upper mould of setting at the upper of lower mould, be provided with the forming chamber in the lower mould, the inside of lower mould is provided with a plurality of exhaust chamber that links with the forming chamber, the gas outlet of exhaust chamber is provided with exhaust passage, the gas outlet of a plurality of exhaust passages is fixedly installed with the lead -through pipe, the end of lead -through pipe is connected to the outside air pump, the cavity wall of exhaust chamber is fixedly installed with the support plate, the central position department of support plate is provided with the central exhaust hole, the upper surface of support plate detachably installs the outer fixed frame, the central position department of outer fixed frame is provided with multistage exhaust grid, and multistage exhaust grid is stacked with a plurality of exhaust plates from top to bottom. The utility model has exhaust structure, can improve production qualified rate, reduce the waste rate.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and more specifically, to a plastic basket injection mold with a multi-stage venting grid. Background Technology

[0002] Currently, when manufacturing plastic crates through injection molding, corresponding plastic crate injection molds are typically used. There are many types of plastic crate injection molds on the market, most of which are divided into upper and lower molds, or fixed and moving molds. When molten plastic is injected into the mold cavity, if the air inside the cavity cannot be expelled in time, it will form bubbles, scorch marks, or internal shrinkage cavities on the surface of the plastic crate, seriously affecting the product's appearance and structural strength. This is especially true for plastic crates with complex structures and large volumes, where it is difficult to meet the requirements for rapid mold filling and efficient venting, resulting in low production qualification rates and high scrap rates.

[0003] To avoid the above problems, some injection molds are usually equipped with corresponding venting grids, so that gas can be discharged outwards in a timely manner through the venting grids, thereby avoiding the generation of air bubbles.

[0004] Utility model patent CN211492675U discloses a honeycomb grid injection mold with easy venting, including a moving mold and a fixed mold. The bottom of the moving mold is equipped with a mold core and guide pillars, while the top of the fixed mold has a cavity and guide sleeve. The fixed mold has an internal venting structure, and positioning components are arranged around the moving and fixed molds. This honeycomb grid injection mold with easy venting creates a sealed space between the cavity and mold core after the moving and fixed molds are closed. If air is present, an air pump is connected to the venting structure to extract the air from the cavity, thus preventing air from interfering with product molding. Furthermore, the positioning components distribute the lateral pressure borne by the guide pillars, improving the mold's rigidity and fitting accuracy.

[0005] While this technical solution has its advantages, most current injection molds with venting grids still have some shortcomings in use. For example, the venting grid is either integrally molded or non-removably installed in the mold, making it impossible to disassemble and replace. When the venting grid needs cleaning, it cannot be disassembled for cleaning, maintenance, or replacement in a timely manner, affecting the performance. Therefore, we propose a plastic basket injection mold with a multi-stage venting grid. Utility Model Content

[0006] The purpose of this invention is to provide a plastic basket injection mold with a multi-stage exhaust grid to solve the defects mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A plastic basket injection mold with a multi-stage venting grid includes a lower mold and an upper mold positioned above the lower mold. The lower mold has a molding chamber and multiple venting chambers connected to the molding chamber. Each venting chamber has a venting channel at its outlet. A guide pipe is fixedly installed at the outlet of each venting channel, and the end of the guide pipe is connected to an external air pump. A support plate is fixedly installed on the wall of each venting chamber. A central venting hole is located at the center of the support plate. An outer fixing frame is detachably installed on the upper surface of the support plate. A multi-stage venting grid is located at the center of the outer fixing frame, and the multi-stage venting grid is composed of multiple stacked venting plates.

[0009] Preferably, a forming punch is fixedly installed on the bottom surface of the upper mold, and the forming punch is inserted into the forming cavity.

[0010] Preferably, the upper mold has multiple internal through holes, and a guide sleeve is detachably installed in each internal through hole. A guide post is detachably installed on the top surface of the lower mold, and the guide post is located inside the guide sleeve and slidably connected to the guide sleeve.

[0011] Preferably, the air outlet end of the guide tube extends out of the lower mold, and a fixed connector is fixedly installed at the air outlet end of the guide tube.

[0012] Preferably, the outer fixing frame and the exhaust plate are integrally formed, and the exhaust plate has a porous structure inside;

[0013] This setting allows for normal venting while also preventing molten material from penetrating the venting plate.

[0014] Preferably, the support plate has a plurality of first screw holes, and the outer fixing frame has a plurality of second screw holes, with fastening screws threaded into the first screw holes and the second screw holes.

[0015] Preferably, a hidden hole is provided at the top opening of the second screw hole, and the head of the fastening screw is hidden in the hidden hole.

[0016] Preferably, a plurality of pressure-resistant plates are fixedly installed between the bottom surface of the support plate and the cavity wall of the exhaust chamber, and the cross section between the pressure-resistant plates, the cavity wall of the exhaust chamber and the support plate forms a triangle;

[0017] This feature provides stable support for the support plate.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. This utility model achieves active extraction of gas from the mold cavity by setting up multiple exhaust chambers, exhaust channels and guide pipes connected to the molding chamber, and connecting the guide pipes to an external air pump. Compared with the traditional passive exhaust method, it can exhaust air more quickly and efficiently, avoiding defects such as bubbles, scorch marks or internal shrinkage cavities on the surface of the plastic basket, thereby improving the appearance quality and structural strength of the plastic basket, increasing the production qualification rate and reducing the scrap rate.

[0020] 2. This utility model designs a multi-stage exhaust grid consisting of multiple stacked exhaust plates, with the outer fixing frame integrally formed with the exhaust plates. It also utilizes the screw holes and fastening screws on the support plate and the outer fixing frame to achieve detachable installation, thus realizing convenient disassembly of the outer fixing frame and the multi-stage exhaust grid. When the exhaust grid needs cleaning, maintenance or replacement, it can be operated in a timely manner, avoiding the impact of blockage or damage to the exhaust grid on the use effect, achieving the effect of convenient maintenance and ensuring stable exhaust performance of the mold.

[0021] 3. This utility model achieves stable support for the support plate and enhances the strength of the mold structure by installing multiple anti-pressure plates forming a triangle between the bottom surface of the support plate and the wall of the exhaust chamber, and by hiding the fastening screw caps in the hidden holes. At the same time, it ensures the flatness of the mold surface and avoids structural deformation caused by external forces from affecting the exhaust and injection molding effect, thereby extending the service life of the mold and improving the overall performance. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This utility model Figure 1 Enlarged view of point A in the middle;

[0024] Figure 3 This is a partial structural schematic diagram of the present invention;

[0025] The meanings of the labels in the diagram are as follows:

[0026] 1. Lower mold; 10. Forming chamber; 11. Upper mold; 12. Forming punch; 13. Inner through hole; 131. Guide sleeve; 14. Guide pillar;

[0027] 2. Exhaust chamber; 20. Support plate; 201. First screw hole; 202. Central exhaust hole; 21. Outer fixing frame; 211. Second screw hole; 212. Hidden hole; 22. Multi-stage exhaust grid; 221. Exhaust plate; 23. Exhaust channel; 24. Conductor pipe; 25. Fixing joint; 26. Pressure-resistant plate. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figures 1-3 This utility model provides a technical solution: a plastic basket injection mold with a multi-stage venting grid, including a lower mold 1 and an upper mold 11 disposed above the lower mold 1. The lower mold 1 is provided with a molding chamber 10. The interior of the lower mold 1 is provided with multiple venting chambers 2 that are connected to the molding chamber 10. The exhaust end of the exhaust chamber 2 is provided with an exhaust channel 23. The exhaust end of the multiple exhaust channels 23 is fixedly installed with a guide pipe 24. The end of the guide pipe 24 is connected to an external air pump, so that the gas in the mold cavity can be extracted by the air pump through the exhaust chamber 2, the exhaust channel 23, and the guide pipe 24, thereby achieving active and efficient venting and avoiding defects such as air holes and air marks caused by gas residue in plastic products, thus improving product quality.

[0030] In this embodiment, a support plate 20 is fixedly installed on the cavity wall of the venting chamber 2. A central venting hole 202 is provided at the center of the support plate 20. An outer fixing frame 21 is detachably installed on the upper surface of the support plate 20. A multi-level venting grid 22 is provided at the center of the outer fixing frame 21. The multi-level venting grid 22 is composed of multiple venting plates 221 stacked on top of each other, which makes the multi-level venting grid 22 easy to disassemble and can be operated in time when cleaning or maintenance is required. At the same time, the outer fixing frame 21 and the venting plate 221 are integrally formed. The venting plate 221 has a porous structure inside, which ensures smooth venting and can also effectively block the penetration of molten material, so as to maintain the good venting performance of the mold and ensure the injection molding quality.

[0031] like Figure 1 As shown, a forming punch 12 is fixedly installed on the bottom surface of the upper mold 11. The forming punch 12 is inserted and engaged with the forming chamber 10, so that the upper mold 11 and the lower mold 1 can be accurately positioned when they are closed, ensuring the forming accuracy of the plastic basket and improving the product forming quality.

[0032] like Figure 1 As shown, the upper mold 11 has multiple internal through holes 13, and a guide sleeve 131 is detachably installed in the internal through holes 13. A guide post 14 is detachably installed on the top surface of the lower mold 1. The guide post 14 is located in the guide sleeve 131 and is slidably connected to the guide sleeve 131, so that the upper mold 11 and the lower mold 1 can be smoothly guided during the opening and closing process, reducing wear between mold components, improving the service life and stability of the mold, and achieving the effect of ensuring the long-term reliable operation of the mold.

[0033] like Figure 1 As shown, the air outlet end of the guide pipe 24 extends out of the lower mold 1, and a fixed connector 25 is fixedly installed at the air outlet end of the guide pipe 24. The fixed connector 25 is connected to an external air pump to facilitate the suction operation using an external air pump.

[0034] like Figure 2 As shown, the support plate 20 is provided with multiple first screw holes 201, and the outer fixing frame 21 is provided with multiple second screw holes 211. The first screw holes 201 and the second screw holes 211 are threaded with fastening screws, so that the connection between the outer fixing frame 21 and the support plate 20 is firm and easy to disassemble, which facilitates the maintenance and replacement of the multi-stage exhaust grid 22, thereby enhancing the convenience of mold maintenance.

[0035] like Figure 2 As shown, a hidden hole 212 is provided at the top opening of the second screw hole 211. The head of the fastening screw is hidden in the hidden hole 212, which ensures the flatness of the inner surface of the mold and the normal operation of the injection process, thereby improving the performance of the mold.

[0036] like Figure 2 As shown, multiple pressure-resistant plates 26 are fixedly installed between the bottom surface of the support plate 20 and the cavity wall of the venting chamber 2. The cross-section between the pressure-resistant plate 26, the cavity wall of the venting chamber 2, and the support plate 20 forms a triangle, which makes the support plate 20 more stable when subjected to pressure, enhances the strength and rigidity of the mold structure, effectively prevents the support plate 20 from being deformed due to force, affecting the venting effect and normal operation of the mold, and achieves the effect of extending the service life of the mold and ensuring the injection molding quality.

[0037] It is worth noting that the exhaust plate 221 is made of porous permeable steel. Porous permeable steel is formed by high-temperature sintering of tiny spheres. The interior of the metal is filled with extremely tiny pores in all directions, allowing air or any gas to permeate and pass through smoothly, while blocking the passage of molten materials.

[0038] When using the multi-stage exhaust grid plastic basket injection mold of this utility model, the upper mold 11 and the lower mold 1 are first closed. The forming punch 12 on the bottom surface of the upper mold 11 is inserted into the forming cavity 10 of the lower mold 1 to achieve precise positioning. At the same time, the guide post 14 on the top surface of the lower mold 1 slides along the guide sleeve 131 in the through hole 13 of the upper mold 11 to ensure smooth mold opening and closing.

[0039] Next, injection molding is performed. Before the molten plastic is injected into the molding chamber 10, the gas in the cavity passes through the multi-stage exhaust grid 22, and then through the exhaust chamber 2 and exhaust channel 23. It is then extracted by the air pump connected to the fixed joint 25 at the end of the guide pipe 24 to achieve active exhaust and reduce the generation of bubbles during the injection molding process.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A plastic basket injection mold with a multi-stage venting grid, comprising a lower mold (1) and an upper mold (11) disposed above the lower mold (1), characterized in that: The lower mold (1) is provided with a molding chamber (10). The lower mold (1) is provided with a plurality of exhaust chambers (2) connected to the molding chamber (10). The exhaust chamber (2) is provided with an exhaust channel (23) at the exhaust end. The exhaust channels (23) are fixedly installed with a guide pipe (24) at the exhaust end. The end of the guide pipe (24) is connected to an external air pump. A support plate (20) is fixedly installed on the cavity wall of the exhaust chamber (2). A central exhaust hole (202) is provided at the center of the support plate (20). An outer fixing frame (21) is detachably installed on the upper surface of the support plate (20). A multi-level exhaust grid (22) is provided at the center of the outer fixing frame (21). The multi-level exhaust grid (22) is composed of multiple exhaust plates (221) stacked on the upper and lower sides.

2. The injection mold for a plastic basket with a multi-stage exhaust grid according to claim 1, characterized in that: A forming punch (12) is fixedly installed on the bottom surface of the upper mold (11), and the forming punch (12) is inserted into the forming chamber (10).

3. The injection mold for a plastic basket with a multi-stage exhaust grid according to claim 1, characterized in that: The upper mold (11) is provided with a plurality of internal through holes (13), and a guide sleeve (131) is detachably installed in the internal through holes (13). A guide post (14) is detachably installed on the top surface of the lower mold (1). The guide post (14) is located in the guide sleeve (131) and is slidably connected to the guide sleeve (131).

4. The injection mold for a plastic basket with a multi-stage exhaust grid according to claim 1, characterized in that: The air outlet end of the guide tube (24) extends out of the lower mold (1), and a fixed connector (25) is fixedly installed on the air outlet end of the guide tube (24).

5. The injection mold for a plastic basket with a multi-stage exhaust grid according to claim 1, characterized in that: The outer fixing frame (21) and the exhaust plate (221) are integrally formed, and the exhaust plate (221) has a porous structure inside.

6. The injection mold for a plastic basket with a multi-stage exhaust grid according to claim 1, characterized in that: The support plate (20) is provided with a plurality of first screw holes (201), and the outer fixing frame (21) is provided with a plurality of second screw holes (211). The first screw holes (201) and the second screw holes (211) are internally threaded with fastening screws.

7. The injection mold for a plastic basket with a multi-stage exhaust grid according to claim 6, characterized in that: A hidden hole (212) is provided at the top opening of the second screw hole (211), and the head of the fastening screw is hidden in the hidden hole (212).

8. The injection mold for a plastic basket with a multi-stage exhaust grid according to claim 1, characterized in that: Multiple pressure-resistant plates (26) are fixedly installed between the bottom surface of the support plate (20) and the cavity wall of the exhaust chamber (2). The cross section between the pressure-resistant plate (26), the cavity wall of the exhaust chamber (2), and the support plate (20) forms a triangle.

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