Precise guide injection mold

Abstract

The utility model discloses a precise guide injection mold, which relates to the technical field of injection molding and comprises a base, a mold assembly and a demolding assembly are arranged on the upper end face of the base, and the mold assembly comprises a support frame, an electric telescopic rod, a top plate, a limiting rod, a mold assembly block, a limiting groove and a limiting hole. The mold closing device has the advantages that the vent holes are formed in the surface of the ejector rod, the sleeve is communicated with the connecting cavity through the vent channel, during demolding, the ejector rod moves upwards to extrude air in the sleeve, and the air enters the connecting cavity through the vent channel and then acts on the surface of a part through the vent holes of the ejector rod to form an air film, so that the adsorption force between the part and the mold closing block is reduced; and meanwhile, air pressure is transmitted to the sliding hole through the connecting cavity to push the demolding block to jack up the part upwards and assist the part to be separated from the base, the deformation or strain risk caused by mechanical ejection of the part can be reduced, and the demolding efficiency and the product yield are improved.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, specifically to a precision guide injection mold. Background Technology

[0002] Injection molds are metal shells made according to the shape of plastic products used in mass production. High-temperature molten plastic is injected into the mold through injection holes and cooled and solidified in the mold to form a plastic product of a predetermined shape. They are widely used in automobile manufacturing, electronics, medical equipment, household goods, packaging, toys and many other fields. In order to facilitate the removal of the plastic product after injection molding, injection molds are generally two-piece spliced ​​structures. Therefore, when injection molding with a combined mold, a high degree of sealing is required to prevent molten plastic from leaking out from the joint during injection and affecting the shape of the finished product.

[0003] Traditional molds often rely on mechanical ejectors to directly eject parts. For parts with complex shapes and strong surface adhesion, mechanical ejection can easily lead to deformation, tearing, or breakage, and also results in high demolding resistance. To address this, we propose a precision guide injection mold. Utility Model Content

[0004] The purpose of this invention is to provide a precision guide injection mold.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a precision guide injection mold, including a base, wherein the upper end surface of the base is provided with a mold closing assembly and a mold release assembly;

[0006] The mold-closing assembly includes a support frame, an electric telescopic rod, a top plate, a limiting rod, a closing module, a limiting groove, and a limiting hole. The side of the support frame is connected to the side of the base. The top of the electric telescopic rod is connected to the inner wall of the support frame. The telescopic end of the electric telescopic rod is connected to the upper end face of the top plate. The limiting groove is opened on the lower end face of the top plate. The side of the closing module is slidably connected to the inner wall of the limiting groove. The bottom end of the limiting rod is connected to the upper end face of the base. The limiting hole is opened inside the closing module. The side of the limiting rod is slidably connected to the inner wall of the limiting hole.

[0007] The demolding assembly includes an ejector pin, a demolding module, a sleeve, a connecting cavity, a venting channel, and a sliding hole. The bottom end of the ejector pin is connected to the upper end face of the top plate, the top end of the sleeve is connected to the inner wall of the support frame, the side of the ejector pin is slidably connected to the inner wall of the sleeve, the venting channel is opened inside the support frame, the connecting cavity is opened inside the base, the sliding hole is opened on the upper end face of the base, and the side of the demolding module is slidably connected to the inner wall of the sliding hole.

[0008] As a further embodiment of this utility model: the number of the assembly modules is set to four, and the top plate, the base and the four assembly modules together form an injection cavity.

[0009] As a further embodiment of this utility model: the upper end face of the top plate is connected to an injection nozzle, and the bottom end of the injection nozzle is connected to the injection cavity.

[0010] As a further embodiment of this utility model: the ventilation channel is connected to the inside of the sleeve, and the ventilation channel is connected to the inside of the connecting cavity.

[0011] As a further embodiment of this utility model: the angle between the limiting rod and the base is set to 85°, and the shape of the limiting hole matches the shape of the limiting rod.

[0012] As a further embodiment of this utility model: the sliding hole is connected to the connecting cavity, and the surface of the push rod is provided with a vent hole.

[0013] Compared with the prior art, the beneficial effects of this utility model by adopting the above technical solution are as follows:

[0014] 1. This utility model features a vent hole on the surface of the ejector rod, and the sleeve is connected to the connecting cavity through the vent channel. During demolding, the ejector rod moves upward to compress the air inside the sleeve. The air enters the connecting cavity through the vent channel and then acts on the surface of the part through the vent hole of the ejector rod, forming an air film. This reduces the adsorption force between the part and the assembly module, making it easier for the part to detach from the assembly module. At the same time, the air pressure is transmitted to the sliding hole through the connecting cavity, pushing the demolding module upward to lift the part and assist it in detaching from the base. Compared with traditional mechanical ejection, this pneumatically assisted demolding method has a more uniform force distribution, which can reduce the risk of deformation or tearing of parts caused by mechanical ejection, and improve demolding efficiency and product yield.

[0015] 2. This utility model uses a limiting rod that forms an 85° angle with the base. When the mold assembly module descends, it slides along the inclined direction of the limiting rod. By matching the shape of the limiting rod with the limiting hole, the oblique guidance of the mold assembly module is achieved. Compared with vertical guidance, this can offset part of the lateral offset force during the mold assembly process, improve the lateral positioning accuracy during mold assembly, ensure that the four mold assembly modules are accurately spliced ​​to form a precisely sized injection cavity, and reduce problems such as burrs and uneven wall thickness caused by mold assembly deviation.

[0016] Other advantages, objectives and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be taught from the practice of this invention. Attached Figure Description

[0017] Figure 1 This is an overall schematic diagram of an embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of the limiting rod in an embodiment of the present utility model;

[0019] Figure 3 This is a schematic diagram of the top plate in an embodiment of the present utility model;

[0020] Figure 4 This is a schematic diagram of the assembly module in an embodiment of this utility model;

[0021] Figure 5 This is a schematic diagram of the limiting hole in an embodiment of the present utility model;

[0022] Figure 6 This is a schematic diagram of the connecting cavity in an embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of the module removal process in an embodiment of this utility model.

[0024] In the diagram: 1. Base; 2. Mold closing assembly; 21. Support frame; 22. Electric telescopic rod; 23. Top plate; 24. Limiting rod; 25. Mold closing module; 26. Limiting groove; 27. Limiting hole; 3. Demolding assembly; 31. Ejector rod; 32. Demolding module; 33. Sleeve; 34. Connecting cavity; 35. Ventilation channel; 36. Sliding hole. Detailed Implementation

[0025] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that the description of these embodiments is for the purpose of helping to understand this utility model, but does not constitute a limitation on this utility model.

[0026] Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0027] Please see the appendix Figure 1 - Appendix Figure 7 The present invention provides a precision guide injection mold, including a base 1, and a mold closing assembly 2 and a mold release assembly 3 provided on the upper end surface of the base 1;

[0028] In Embodiment 1, the mold assembly 2 includes a support frame 21, an electric telescopic rod 22, a top plate 23, a limiting rod 24, a mold assembly module 25, a limiting groove 26, and a limiting hole 27. The side of the support frame 21 is connected to the side of the base 1. The top of the electric telescopic rod 22 is connected to the inner wall of the support frame 21. The telescopic end of the electric telescopic rod 22 is connected to the upper end face of the top plate 23. The limiting groove 26 is opened on the lower end face of the top plate 23. The side of the mold assembly module 25 is slidably connected to the inner wall of the limiting groove 26. The bottom end of the limiting rod 24 is connected to the upper end face of the base 1. The limiting hole 27 is opened inside the mold assembly module 25. The side of the limiting rod 24 is slidably connected to the inner wall of the limiting hole 27. The number of mold assembly modules 25 is set to four. The top plate 23, the base 1, and the four mold assembly modules 25 together form an injection cavity. The angle between the limiting rod 24 and the base 1 is set to 85°. The shape of the limiting hole 27 matches the shape of the limiting rod 24.

[0029] Specifically, the limiting rod 24 forms an 85° angle with the base 1. This angle can generate a lateral force during mold closing, offsetting the lateral displacement caused by mold processing errors or injection pressure during the descent of the mold closing module 25. At the same time, it avoids the significant increase in mold closing resistance due to excessive angle. The limiting groove 26 on the lower end face of the top plate 23 is a T-shaped groove. The side of the mold closing module 25 is machined with a corresponding boss, which forms a sliding guide pair with the limiting groove 26, restricting the radial movement of the mold closing module 25 in the vertical direction and only allowing it to slide up and down along the groove. The four mold closing modules 25 are arranged in a rectangular shape. Each mold closing module 25 cooperates with the limiting groove 26 and the limiting rod 24. Through the double constraint of "vertical limiting groove + oblique limiting rod", it is ensured that the four modules move towards the center synchronously and smoothly during mold closing, forming a precisely sized injection cavity.

[0030] In embodiment 2, the demolding assembly 3 includes an ejector rod 31, a demolding module 32, a sleeve 33, a connecting cavity 34, a ventilation channel 35, and a sliding hole 36. The bottom end of the ejector rod 31 is connected to the upper end face of the top plate 23, the top end of the sleeve 33 is connected to the inner wall of the support frame 21, the side of the ejector rod 31 is slidably connected to the inner wall of the sleeve 33, the ventilation channel 35 is opened inside the support frame 21, the connecting cavity 34 is opened inside the base 1, the sliding hole 36 is opened on the upper end face of the base 1, the side of the demolding module 32 is slidably connected to the inner wall of the sliding hole 36, the upper end face of the top plate 23 is connected to an injection nozzle, the bottom end of the injection nozzle is connected to the injection cavity, the ventilation channel 35 is connected to the inside of the sleeve 33, the ventilation channel 35 is connected to the inside of the connecting cavity 34, the sliding hole 36 is connected to the inside of the connecting cavity 34, and the ejector rod 31 is provided with ventilation holes on its surface.

[0031] Specifically, the ejector rod 31 has multiple micropores or annular pores evenly distributed on its surface, with a pore diameter of approximately 0.5mm-1mm. These pores are positioned at the bottom of the injection molding cavity or at areas where the part is easily adhered. When the ejector rod 31 moves upward, the air inside the sleeve 33 is compressed and enters the connecting cavity 34 through the ventilation channel 35. The air is then blown onto the surface of the part at a pressure of 0.1MPa-0.3MPa through the ventilation holes of the ejector rod 31, forming an air film. This breaks the vacuum adhesion or intermolecular forces between the part and the connecting module 25. The connecting cavity 34 is connected to the sliding hole 36. After the air pressure is transmitted to the sliding hole 36, it pushes the release module 32 upward, lifting the bottom of the part. The top of the release module 32 can be designed as an arc or a shape that matches the bottom surface of the part to ensure that the ejection force is evenly distributed and to avoid local stress concentration.

[0032] Working principle:

[0033] First, the electric telescopic rod 22 is activated, and its telescopic end pushes the top plate 23 downward. At this time, the four assembly modules 25, which are slidably connected to the limiting groove 26 on the lower end face of the top plate 23, descend synchronously with the top plate 23. The limiting rod 24 on the upper end face of the base 1 is inserted into the limiting hole 27 inside the assembly module 25. Since the limiting rod 24 and the base 1 form an 85° angle and the shape of the limiting hole 27 matches it, the assembly module 25 slides along the inclined direction of the limiting rod 24 during the descent, realizing oblique guiding positioning and ensuring that the four assembly modules 25 are accurately spliced ​​to form an injection cavity. The top plate 23, the base 1, and the four assembly modules 25 finally surround and form a closed injection cavity. The injection nozzle on the upper end face of the top plate 23 is connected to the injection cavity to prepare for the injection of molten plastic.

[0034] Molten plastic is injected into the injection cavity through the injection nozzle. The plastic cools and solidifies inside the cavity to form the desired part. After injection molding, the electric telescopic rod 22 retracts, pulling the top plate 23 upward. The assembly module 25 detaches from the base 1 along with the top plate 23. At the same time, the push rod 31 is pulled upward from the sleeve 33. The surface of the push rod 31 is provided with vent holes. The sleeve 33 is connected to the connecting cavity 34 through the vent channel 35. When the push rod 31 moves upward, it compresses the air inside the sleeve 33. The air enters the connecting cavity 34 through the vent channel 35 and passes through the push rod. The vent 31 acts on the surface of the part to reduce the adhesion between the part and the assembly module 25. The sliding hole 36 on the upper end face of the base 1 is connected to the connecting cavity 34. The release module 32 can slide up and down in the sliding hole 36. The air pressure may be transmitted to the sliding hole 36 through the connecting cavity 34, pushing the release module 32 to lift the part upward, assisting it to detach from the base 1 and remove the part. After the assembly module 25 is fully opened, the part is pushed out by the release module 32, and the operator can remove the molded part, completing one injection molding cycle. At this point, the entire workflow is over.

[0035] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on.

[0036] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0037] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments.

[0038] For those skilled in the art, various changes, modifications, substitutions, and alterations to these embodiments without departing from the principles and spirit of this utility model will still fall within the protection scope of this utility model.

Claims

1. A precision guide injection mold, comprising a base (1), characterized in that: The upper surface of the base (1) is provided with a mold closing assembly (2) and a demolding assembly (3); The mold assembly (2) includes a support frame (21), an electric telescopic rod (22), a top plate (23), a limiting rod (24), a mold assembly module (25), a limiting groove (26), and a limiting hole (27). The side of the support frame (21) is connected to the side of the base (1). The top of the electric telescopic rod (22) is connected to the inner wall of the support frame (21). The telescopic end of the electric telescopic rod (22) is connected to the upper end face of the top plate (23). The limiting groove (26) is opened on the lower end face of the top plate (23). The side of the mold assembly module (25) is slidably connected to the inner wall of the limiting groove (26). The bottom end of the limiting rod (24) is connected to the upper end face of the base (1). The limiting hole (27) is opened inside the mold assembly module (25). The side of the limiting rod (24) is slidably connected to the inner wall of the limiting hole (27). The demolding assembly (3) includes a push rod (31), a demolding module (32), a sleeve (33), a connecting cavity (34), a ventilation channel (35), and a sliding hole (36). The bottom end of the push rod (31) is connected to the upper end face of the top plate (23). The top end of the sleeve (33) is connected to the inner wall of the support frame (21). The side of the push rod (31) is slidably connected to the inner wall of the sleeve (33). The ventilation channel (35) is opened inside the support frame (21). The connecting cavity (34) is opened inside the base (1). The sliding hole (36) is opened on the upper end face of the base (1). The side of the demolding module (32) is slidably connected to the inner wall of the sliding hole (36).

2. The precision guide injection mold according to claim 1, characterized in that: The number of the assembly modules (25) is set to four, and the top plate (23), the base (1) and the four assembly modules (25) together form an injection cavity.

3. A precision guide injection mold according to claim 2, characterized in that: The top plate (23) is connected to an injection nozzle on its upper end surface, and the bottom end of the injection nozzle is connected to the injection cavity.

4. A precision guide injection mold according to claim 1, characterized in that: The ventilation channel (35) is connected to the inside of the sleeve (33), and the ventilation channel (35) is connected to the inside of the connecting cavity (34).

5. A precision guide injection mold according to claim 1, characterized in that: The angle between the limiting rod (24) and the base (1) is set to 85°, and the shape of the limiting hole (27) matches the shape of the limiting rod (24).

6. A precision guide injection mold according to claim 1, characterized in that: The sliding hole (36) is connected to the connecting cavity (34), and the surface of the push rod (31) is provided with a vent hole.

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