Anti-sticking plastic injection mold

Abstract

The utility model discloses an anti-sticking plastic injection mold. The anti-sticking plastic injection mold comprises a movable mold, a fixed mold seat and a column pressure assembly, a spraying hole is formed in the movable mold, joint grooves are formed in the two sides of the fixed mold base, the column pressing assemblies are symmetrically arranged on the two sides of the movable mold, and each column pressing assembly comprises a pump box base, a plunger pipe, a pressing guide head and an arc sliding block. A liquid injection valve is arranged on the surface of the pump box base, communicates with the plunger pipe through an inner flow channel, is of a one-way valve structure and is used for injection of a release agent. A connecting rod is movably connected to the surface of the pressing guide head and connected with an arc sliding block, and the arc sliding block is slidably connected with the inner side of the plunger pipe through an arc plug rod. In the mold closing process, the pressing guide head makes contact with the joint groove in the fixed mold base, the pressing guide head moves to drive the arc sliding block and the plunger rod to slide synchronously, and therefore a release agent is evenly sprayed to the surface of a mold cavity through the spraying holes, and the adhesion phenomenon is reduced. The mold is compact in structure and uniform in spraying effect, and the demolding efficiency and the workpiece integrity are improved.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to an anti-stick plastic injection mold. Background Technology

[0002] In the field of injection molding, plastic injection molds are widely used in the production of various plastic products. However, during the injection molding process, the high smoothness of the mold cavity surface or the close contact between the workpiece and the mold cavity surface often leads to increased demolding resistance, resulting in workpiece sticking to the mold cavity or difficulty in demolding.

[0003] To reduce mold adhesion problems, the following methods are commonly used in existing technologies:

[0004] By spraying a release agent onto the surface of the mold cavity, a separating film is formed between the workpiece and the mold cavity, reducing direct contact and friction, thereby reducing demolding resistance. However, in existing technologies, the release agent is usually sprayed manually or through an external spraying device, which can lead to uneven spraying, insufficient coverage, or excessive coverage, affecting the demolding effect and product quality.

[0005] Secondly, by setting ejector pins or ejector plates inside the moving or fixed mold, the workpiece is ejected mechanically after mold closing. However, this method usually involves direct contact with the workpiece surface for demolding, which may cause scratches or deformation on the workpiece surface, affecting the appearance and dimensional accuracy of the workpiece.

[0006] The following technical problems exist in the existing technology:

[0007] The current mold release agent spraying method is limited and uneven, leading to inconsistent release performance. Ejection methods, which involve direct contact with the workpiece surface, are prone to scratches or deformation, affecting workpiece quality. Existing spraying and release methods are complex in structure and inconvenient to operate, impacting injection molding production efficiency and stability.

[0008] Therefore, there is an urgent need for an injection mold structure that is compact, highly automated, uniformly sprayed, and easy to operate, which can achieve precise spraying of release agent through automated control during the injection process, improve the release effect, reduce sticking problems, and ensure the surface quality of the workpiece and the efficiency of injection molding production. Summary of the Invention

[0009] The present invention aims to solve the technical problems existing in the prior art or related technologies.

[0010] This utility model provides an anti-stick plastic injection mold, including a moving mold, a fixed mold base, and a column pressing assembly; the moving mold has spray holes inside for spraying a release agent, and the fixed mold base has joint grooves on both sides for docking with the column pressing assembly.

[0011] The column pressure assembly is symmetrically arranged on both sides of the moving mold. The column pressure assembly includes a pump box seat, a plunger tube, a pressure guide head, and an arc slider that is slidably installed inside the pump box seat. A liquid injection valve is fixedly connected to the surface of the pump box seat, and an inner flow channel communicating with the liquid injection valve is provided on the inner side of the pump box seat. The inner flow channel is used to connect the plunger tube and the liquid injection valve.

[0012] The injection valve is a one-way valve structure used for injecting the release agent liquid. The inner side of the plunger tube is slidably connected to the pressure guide head. A connecting rod is movably connected to the surface of the pressure guide head, and the other end of the connecting rod is movably connected to the surface of the arc slider. A plunger rod is fixedly installed on the top surface of the pressure guide head and slidably sleeved on the inner side of the plunger tube. An arc rod is fixedly installed on the surface of the arc slider, and one end of the arc rod is slidably sleeved on the inner side of the plunger tube. The mating groove is arranged opposite to the pressure guide head.

[0013] 1. Liquid injection and spraying process

[0014] During the injection molding process, the injection valve, with its one-way valve structure, allows mold release agent to be injected from the outside into the internal flow channel of the pump housing. When external injection pressure is applied to the injection valve, the one-way valve opens, and the mold release agent enters the plunger tube through the internal flow channel. After injection is complete, the injection valve automatically closes to prevent mold release agent overflow. At this point, the plunger tube is filled with mold release agent and ready for spraying.

[0015] 2. The spraying and pressurizing process of the release agent.

[0016] During the mold closing process, the moving mold and the fixed mold base gradually close together, and the pressure guide head comes into contact with the engagement groove on the fixed mold base. During the contact process, the engagement groove applies an upward thrust to the pressure guide head, causing the pressure guide head to slide inside the plunger tube.

[0017] Under the sliding action of the pressure guide head, the plunger rod moves upward, further pushing the connecting rod to move axially along the plunger tube. The connecting rod connects to the arc slider, causing the arc slider to slide synchronously inside the pump housing. The arc rod and the plunger rod slide inside the plunger tube.

[0018] During the sliding process of the plunger rod and the arc slider, the arc slider slides synchronously inside the plunger tube, creating an internal hydraulic pressure. At this time, the release agent liquid is evenly sprayed onto the contact surface between the moving mold and the fixed mold base through the nozzle channel and spray holes.

[0019] The beneficial effects achieved by this utility model are as follows:

[0020] 1. In this utility model, by setting an injection valve, a plunger tube and a spray hole, a release agent can be evenly sprayed onto the surface of the mold cavity during the mold closing process. During the demolding process, a protective film is formed between the workpiece and the mold cavity, reducing direct contact, significantly reducing the incidence of sticking, and improving injection molding efficiency and the integrity of product molding.

[0021] 2. In this utility model, the column pressure component is integrated into the internal structure of the moving mold, resulting in a compact overall structure, small footprint, and easy compatibility and installation with existing injection molding equipment. Through the coordinated operation of the arc slider and arc plug rod, the release agent spraying process is automated and precise, reducing manual intervention and improving the automation level and ease of operation of the equipment. Attached Figure Description

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

[0023] Figure 2 This is a schematic diagram of the surface structure of the moving mold and the fixed mold base according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the internal structure of the pump box seat according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the installation structure of the column pressure assembly according to an embodiment of the present invention;

[0026] Figure 5 This is one embodiment of the present utility model. Figure 3 A schematic diagram of the structure at point A.

[0027] Figure label:

[0028] 100. Moving mold; 110. Spray nozzle; 200. Fixed mold base; 210. Joint groove;

[0029] 300, Plunger assembly; 310, Pump housing; 320, Plunger tube; 330, Pressure guide head; 340, Arc slide block; 311, Injection valve; 312, Inner flow channel; 313, Nozzle flow channel; 331, Plunger rod; 332, Connecting rod; 341, Arc rod. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0031] It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this invention.

[0032] The following is in conjunction with the appendix Figures 1-5 This invention describes an anti-stick plastic injection mold provided by some embodiments of the present invention.

[0033] This embodiment relates to an anti-stick plastic injection mold, including a moving mold 100, a fixed mold base 200, and a column pressure assembly 300.

[0034] 1. Structural Composition

[0035] The moving mold 100 has spray holes 110 inside for spraying release agent.

[0036] Both sides of the fixed mold base 200 are provided with engagement grooves 210 for docking with the column pressure assembly 300.

[0037] The column pressure assembly 300 is symmetrically arranged on both sides of the moving mold 100. The column pressure assembly 300 includes a pump box seat 310, a plunger tube 320, a pressure guide head 330, and an arc slider 340 that is slidably installed inside the pump box seat 310.

[0038] A liquid injection valve 311 is fixedly connected to the surface of the pump housing 310, and the liquid injection valve 311 is connected to the inner flow channel 312 on the inner side of the pump housing 310. The liquid injection valve 311 is a one-way valve structure and is used for injecting the release agent liquid.

[0039] The inner side of the plunger tube 320 is slidably connected to the pressure guide head 330. The surface of the pressure guide head 330 is movably connected to the connecting rod 332, and the other end of the connecting rod 332 is movably connected to the surface of the arc slider 340.

[0040] A plunger rod 331, which is slidably sleeved inside the plunger tube 320, is fixedly installed on the top surface of the pressure guide head 330.

[0041] An arc plug rod 341 is fixedly mounted on the surface of the arc block 340, and one end of the arc plug rod 341 is slidably sleeved inside the plunger tube 320. The engagement groove 210 is arranged opposite to the pressure guide head 330.

[0042] 2. Release agent injection and spraying process

[0043] During the operation of the injection mold, the injection valve 311, through the structural feature of the one-way valve, allows the release agent liquid to be injected from the outside into the inner flow channel 312 inside the pump box seat 310.

[0044] When external injection pressure is applied to injection valve 311, the one-way valve opens, and the release agent liquid enters plunger tube 320 through inner flow channel 312.

[0045] After injection is complete, injection valve 311 automatically closes to prevent release agent liquid from overflowing. At this time, plunger tube 320 is filled with release agent liquid, ready for spraying.

[0046] 3. The spraying and pressurizing process of the release agent.

[0047] During the mold closing process, the moving mold 100 and the fixed mold base 200 gradually close together, and the pressure guide head 330 comes into contact with the engagement groove 210 on the fixed mold base 200.

[0048] During the contact process, the engagement groove 210 applies an upward thrust to the pressure guide head 330, causing the pressure guide head 330 to slide inside the plunger tube 320.

[0049] Under the sliding action of the pressure guide head 330, the plunger rod 331 moves upward, further pushing the connecting rod 332 to move axially along the plunger tube 320. The connecting rod 332 connects to the arc slider 340, causing the arc slider 340 to slide synchronously inside the pump housing 310.

[0050] Arc rod 341 and plunger rod 331 slide inside plunger tube 320. During the sliding process of plunger rod 331 and arc rod 340, arc rod 341 slides synchronously inside plunger tube 320, forming an internal hydraulic pressurization effect.

[0051] At this time, the release agent liquid is evenly sprayed through the nozzle 110 into the contact surface between the moving mold 100 and the fixed mold base 200 via the nozzle flow channel 313.

[0052] 4. Achieving the demolding effect

[0053] After the release agent is sprayed, it forms a thin film on the surface of the mold cavity, reducing the direct contact between the injection molded part and the mold and reducing the sticking effect.

[0054] After the release agent is applied, the mold opens after cooling, and the workpiece can be easily removed from the mold, preventing damage to the workpiece or incomplete demolding due to adhesion.

[0055] The amount and pressure of the release agent can be adjusted by controlling the hydraulic pressure inside the injection valve 311 and the plunger tube 320 to ensure the stability of the release effect.

[0056] Specifically, the moving mold 100 and the fixed mold base 200 are aligned and positioned by a guiding device, which includes symmetrically arranged guide pillars and guide sleeves.

[0057] The plunger tube 320 and the arc slider 340 are movably connected by a connecting rod 332. The arc slider 340 slides inside the pump housing 310 via the pressure guide head 330 and the connecting rod 332. The injection valve 311 is threaded onto the pump housing 310, and a filter is provided inside the injection valve 311 to filter impurities in the release agent. The surface of the inner flow channel 312 is coated with a corrosion-resistant coating to improve corrosion resistance and extend the service life of the mold. The connecting rod 332 is connected to the arc slider 340 via a pin structure to achieve smooth sliding of the arc slider 340. The surfaces of the arc rod 341 and the plunger rod 331 are coated with a self-lubricating coating to reduce motion friction and improve the overall performance of the injection mold.

[0058] Working principle and usage process of this utility model:

[0059] This utility model relates to an anti-stick plastic injection mold. By incorporating components such as an injection valve, a plunger tube, and an arc-shaped slider, it achieves efficient spraying of the release agent, improving the demolding effect of the workpiece during injection molding and preventing mold sticking. Its complete working principle is as follows:

[0060] 1. Release agent injection and spraying process

[0061] During the injection molding process, the injection valve 311, through its one-way valve structure, allows the release agent liquid to be injected from the outside into the inner flow channel 312 inside the pump housing 310. When external injection pressure is applied to the injection valve 311, the one-way valve opens, and the release agent liquid enters the plunger tube 320 through the inner flow channel 312. After injection is completed, the injection valve 311 automatically closes to prevent the release agent liquid from overflowing. At this time, the plunger tube 320 is filled with release agent liquid.

[0062] 2. The spraying and pressurizing process of the release agent.

[0063] During the mold closing process, the moving mold 100 and the fixed mold base 200 gradually close together, and the pressure guide head 330 comes into contact with the engagement groove 210 on the fixed mold base 200.

[0064] During the contact process, the engagement groove 210 applies an upward thrust to the pressure guide head 330, causing the pressure guide head 330 to move. The connecting rod 332 connects to the arc slider 340, causing the arc slider 340 to slide synchronously inside the pump box seat 310.

[0065] One end of the arc rod 341 and the plunger rod 331 slides inside the plunger tube 320.

[0066] During the sliding process of the plunger rod 331 and the arc slider 340, the arc slider 341 slides synchronously inside the plunger tube 320, forming an internal hydraulic pressure effect, which sprays the release agent liquid evenly onto the contact surface between the moving mold 100 and the fixed mold base 200 through the spray nozzle 110 via the spray pipe channel 313.

[0067] 3. Achieving the demolding effect

[0068] After the release agent is sprayed, it forms a thin film on the surface of the mold cavity, reducing the direct contact between the injection molded part and the mold and reducing the sticking effect.

[0069] After the release agent is applied, the mold opens after cooling, and the workpiece can be easily removed from the mold, preventing damage to the workpiece or incomplete demolding due to adhesion.

[0070] The amount and pressure of the release agent can be adjusted by controlling the hydraulic pressure inside the injection valve 311 and the plunger tube 320 to ensure the stability of the release effect.

[0071] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0072] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A plastic injection mold for preventing sticking, characterized by, include: Moving mold (100), fixed mold base (200), and column pressing assembly (300); The moving mold (100) has spray holes (110) inside for spraying release agent, and the fixed mold base (200) has joint grooves (210) on both sides for docking with the column pressure assembly (300). The column pressure assembly (300) is symmetrically arranged on both sides of the moving mold (100). The column pressure assembly (300) includes a pump box seat (310), a plunger tube (320), a pressure guide head (330), and an arc slider (340) slidably installed inside the pump box seat (310). A liquid injection valve (311) is fixedly connected to the surface of the pump housing (310), and an inner flow channel (312) communicating with the liquid injection valve (311) is provided on the inner side of the pump housing (310). The inner flow channel (312) is used to connect the plunger tube (320) and the liquid injection valve (311). The liquid injection valve (311) is a one-way valve structure and is used for the injection of release agent liquid. The pressure guide head (330) is slidably connected to the inner side of the plunger tube (320). The surface of the pressure guide head (330) is movably connected to a connecting rod (332), and the other end of the connecting rod (332) is movably connected to the surface of the arc slider (340); a plunger rod (331) is fixedly installed on the top surface of the pressure guide head (330) and slidably sleeved on the inside of the plunger tube (320); an arc slider rod (341) is fixedly installed on the surface of the arc slider (340), and one end of the arc slider rod (341) is slidably sleeved on the inside of the plunger tube (320); the engagement groove (210) is arranged opposite to the pressure guide head (330).

2. A plastic injection mold with anti-sticking according to claim 1, characterized in that, The moving mold (100) and the fixed mold base (200) are aligned and positioned by a guiding device, which includes symmetrically arranged guide pillars and guide sleeves.

3. A plastic injection mold with anti-sticking according to claim 1, characterized in that, The plunger tube (320) and the arc slider (340) are movably connected by a connecting rod (332). The arc slider (340) slides inside the pump box seat (310) through the pressure guide head (330) and the connecting rod (332).

4. A plastic injection mold with anti-sticking according to claim 1, characterized in that, The injection valve (311) is installed on the pump housing (310) by a threaded structure, and the inner side of the injection valve (311) is provided with a filter device for filtering impurities in the release agent.

5. A plastic injection mold with anti-sticking according to claim 1, wherein The surface of the inner flow channel (312) is provided with a corrosion-resistant coating to improve corrosion resistance and extend the service life of the mold.

6. A plastic injection mold with anti-sticking according to claim 1, wherein The connecting rod (332) is connected to the arc slider (340) through a pin structure to achieve smooth sliding of the arc slider (340).

7. A plastic injection mold with anti-sticking according to claim 1, wherein The surfaces of the arc plug rod (341) and plunger rod (331) are provided with a self-lubricating coating to reduce motion friction and improve the overall performance of the injection mold.

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