A mold structure for convenient injection molding.

Abstract

This invention provides a convenient injection molding mold structure, belonging to the field of mold technology. It includes a mounting plate, an upper mold, and a lower mold. The upper mold is located at the bottom of the mounting plate, and the lower mold is located at the bottom of the upper mold. A drainage pipe is installed inside the mounting plate, and a branch pipe is fixedly connected to the outer surface of the drainage pipe. An outlet pipe is fixedly connected to the bottom of the branch pipe. A heat-conducting arc-shaped block is provided on the outer surface of the outlet pipe, and an electric heating plate is installed at the top of the heat-conducting arc-shaped block. In this invention, the plastic material injected into an external injection molding machine through the drainage pipe is branched through the branch pipe and injected into the cavity of the lower mold through the outlet pipe. The heat-conducting arc-shaped block is in close contact with the outer surface of the outlet pipe, serving to conduct heat and provide heat encapsulation. The electric heating plate is installed at the top of the heat-conducting arc-shaped block. After activation, it transfers heat to the heat-conducting arc-shaped block, thereby heating the plastic material in the outlet pipe, preventing the plastic material from cooling and solidifying, enhancing the fluidity of the plastic material, and facilitating uniform filling of multi-cavity or complex mold structures.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology, specifically relating to a mold structure that facilitates injection molding. Background Technology

[0002] Injection molding, also known as injection molding, is a molding method that combines injection and molding. Its advantages include high production speed and efficiency, making it suitable for mass production and molding of complex shapes. In the injection molding process, the mold is the core equipment that determines product quality and production efficiency. The mold is a cavity structure precisely machined according to product design requirements, used to inject molten material under high pressure and allow it to cool and solidify, ultimately obtaining the desired shape of the part or product.

[0003] During the injection molding process, when the high-temperature molten plastic enters the mold's guide tube from the injection molding machine nozzle, the guide tube is usually made of a metal mold body. Since the mold as a whole needs to be temperature controlled by a cooling water circulation system to shorten the molding cycle, the temperature of the inner wall of the guide tube is relatively low. After the molten plastic comes into contact with the cold metal wall, heat conduction will occur, which will cause the outer layer of the plastic material to cool rapidly and the viscosity to increase, thus increasing the difficulty of injection. Utility Model Content

[0004] The technical problem this invention aims to solve is that the molten adhesive cools too quickly during the injection process, which can lead to a decrease in fluidity and increase the difficulty of injection. To address this, we propose a mold structure that facilitates injection.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] A mold structure for convenient injection molding includes a mounting plate, an upper mold, and a lower mold. The upper mold is located at the bottom of the mounting plate, and the lower mold is located at the bottom of the upper mold. A drainage pipe is installed inside the mounting plate, and a branch pipe is fixedly connected to the outer surface of the drainage pipe. A discharge pipe is fixedly connected to the bottom of the branch pipe. A heat-conducting arc block is provided on the outer surface of the discharge pipe, and an electric heating plate is installed at the top of the heat-conducting arc block.

[0007] Preferably, the discharge pipe includes a first flow chamber, a second flow chamber, and a third flow chamber, with the diameters of the first flow chamber, the second flow chamber, and the third flow chamber increasing sequentially.

[0008] Preferably, the drainage tube is funnel-shaped, and the lowest end of the third flow cavity is set to be arc-shaped.

[0009] Preferably, the top of the upper mold has a groove, the bottom of the inner wall of the groove has a pipe, the heat-conducting arc block is installed in the groove, and the discharge pipe is set in correspondence with the pipe.

[0010] Preferably, a connecting ring is installed at the top of the mounting plate, and a feed pipe is installed inside the connecting ring. The feed pipe is connected to the drain pipe, and a first locking bolt is threaded between the connecting ring and the mounting plate.

[0011] Preferably, an annular sealing gasket is provided between the connecting ring and the mounting plate, and the first locking bolt passes through the annular sealing gasket.

[0012] Preferably, a first connecting plate is installed on the outer surface of the connecting ring, a second connecting plate is provided at the bottom end of the first connecting plate, a second locking bolt is threaded between the first connecting plate and the second connecting plate, and a third locking bolt is threaded between the second connecting plate and the upper mold.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. By combining an electric heating plate and a heat-conducting arc block set outside the discharge pipe, the molten rubber in the flow channel is continuously and evenly heated, preventing the rubber from cooling and solidifying due to heat loss before entering the mold cavity, ensuring that the rubber always maintains good fluidity and high temperature, which facilitates the injection of the rubber.

[0015] 2. The first, second, and third flow chambers of the discharge pipe adopt a three-section variable diameter design. The inlet is small and the cross-sectional area of ​​the subsequent flow channels gradually increases. This design makes it easy to control the initial flow rate and then allow the rubber material to decelerate and expand smoothly, which helps to maintain the laminar flow state and facilitates the feeding of the rubber. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the diversion pipe, discharge pipe and heat-conducting arc block of this utility model;

[0019] Figure 3 This is a schematic diagram of the discharge pipe structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the groove structure of this utility model;

[0021] Figure 5 This is a schematic diagram of the connecting ring, annular sealing gasket, first connecting plate and second connecting plate of this utility model.

[0022] In the diagram: 1. Mounting plate; 11. Drain pipe; 111. Diverter pipe; 2. Upper mold; 21. Groove; 211. Pipe; 3. Lower mold; 4. Discharge pipe; 41. First flow cavity; 42. Second flow cavity; 43. Third flow cavity; 5. Heat-conducting arc block; 51. Electric heating plate; 6. Connecting ring; 61. Feed pipe; 62. First locking bolt; 7. Annular sealing gasket; 8. First connecting plate; 81. Second locking bolt; 9. Second connecting plate; 91. Third locking bolt. Detailed Implementation

[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0024] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] Example

[0026] Reference Figure 1 - Figure 5 This embodiment of the present invention provides a mold structure for convenient injection molding, including a mounting plate 1, an upper mold 2, and a lower mold 3. The upper mold 2 is disposed at the bottom end of the mounting plate 1, and the lower mold 3 is disposed at the bottom end of the upper mold 2. A drain pipe 11 is installed inside the mounting plate 1, and a branch pipe 111 is fixedly connected to the outer surface of the drain pipe 11. A discharge pipe 4 is fixedly connected to the bottom end of the branch pipe 111. A heat-conducting arc-shaped block 5 is disposed on the outer surface of the discharge pipe 4, and an electric heating plate 5 is installed at the top of the heat-conducting arc-shaped block 5. 1. The rubber material enters the guide pipe 11 inside the mounting plate 1 from the external injection molding machine, is divided by the diversion pipe 111, and is injected into the cavity of the lower mold 3 through the discharge pipe 4. The heat-conducting arc block 5 is closely attached to the outer surface of the discharge pipe 4, which plays the role of heat conduction and wrapping heating. The electric heating plate 51 is installed on the top of the heat-conducting arc block 5. After starting, it transfers heat to the heat-conducting arc block 5, thereby heating the rubber material in the discharge pipe 4, preventing the rubber material from cooling and solidifying, and enhancing the fluidity of the rubber material, which helps to uniformly fill multi-cavity or complex structure molds.

[0027] The discharge pipe 4 includes a first flow chamber 41, a second flow chamber 42, and a third flow chamber 43. The diameters of the first flow chamber 41, the second flow chamber 42, and the third flow chamber 43 increase sequentially. The first flow chamber 41 serves as the initial inlet and has a smaller size, making it easier to control the initial flow rate. After the rubber enters the second flow chamber 42 and the third flow chamber 43, the cross-sectional area gradually increases, causing the colloid to expand slowly and the speed to decrease, allowing the melt to spread naturally and maintain a laminar flow state.

[0028] The drain pipe 11 is funnel-shaped, and the lowest end of the third flow cavity 43 is set as an arc. The funnel-shaped structure expands the inlet area, which facilitates the smooth entry of the rubber into the drain pipe 11. The arc-shaped inclined inner wall plays a guiding role, allowing the rubber to naturally converge towards the outlet and reducing the accumulation of dead corners at the edge of the third flow cavity 43 pipe wall.

[0029] The upper mold 2 has a groove 21 at the top and a pipe 211 at the bottom of the inner wall of the groove 21. The heat-conducting arc block 5 is installed in the groove 21. The discharge pipe 4 is set in correspondence with the pipe 211. The groove 21 provides a limiting space for the heat-conducting arc block 5 and the pipe 211 provides a limiting space for the discharge pipe 4. The discharge pipe 4 extends into the inside of the pipe 211.

[0030] A connecting ring 6 is installed at the top of the mounting plate 1. A feed pipe 61 is installed inside the connecting ring 6. The feed pipe 61 is connected to the drain pipe 11. A first locking bolt 62 is threaded between the connecting ring 6 and the mounting plate 1. The connecting ring 6 serves as a transition connector installed at the top of the mounting plate 1. It is used to fix the feed pipe 61 and connect it to the nozzle of the external injection molding machine. The feed pipe 61 is used to receive molten rubber from the injection molding machine and guide it into the drain pipe 11.

[0031] An annular sealing gasket 7 is provided between the connecting ring 6 and the mounting plate 1. The first locking bolt 62 passes through the annular sealing gasket 7. The annular sealing gasket 7 is compressed under the pre-tightening force of the first locking bolt 62, filling the tiny gap between the connecting ring 6 and the mounting plate 1 to reduce the leakage of molten adhesive from the interface.

[0032] A first connecting plate 8 is installed on the outer surface of the connecting ring 6, and a second connecting plate 9 is provided at the bottom of the first connecting plate 8. A second locking bolt 81 is threaded between the first connecting plate 8 and the second connecting plate 9, and a third locking bolt 91 is threaded between the second connecting plate 9 and the upper mold 2. The first connecting plate 8 and the second connecting plate 9 form a rigid outer frame structure, which facilitates the fixing of the mounting plate 1 and the upper mold 2. The second locking bolt 81 can be removed to facilitate the separation of the connecting ring 6 and the upper mold 2.

[0033] Working principle: Align the feed pipe 61 at the top of the mounting plate 1 with the injection molding machine nozzle to ensure the feed channel is connected. The annular sealing gasket 7 is clamped between the connecting ring 6 and the mounting plate 1 and tightened by the first locking bolt 62 to prevent molten glue leakage. Start the electric heating plate 51. The electric heating plate 51 starts working, and the heat is transferred to the heat-conducting arc block 5 and then to the discharge pipe 4, so that the entire flow channel system is preheated to the set temperature. The heat-conducting arc block 5 is set on the outer surface of the discharge pipe 4 to ensure uniform heating. The injection molding machine pushes the high-temperature molten rubber from the nozzle into the feed pipe 61. The rubber flows through the feed pipe 61 into the funnel-shaped guide. The flow tube 11 has a funnel structure that expands the inlet area, making it easier to receive the rubber material, reducing initial resistance, and guiding the rubber material to converge towards the center. The diverted rubber material enters the discharge tube 4. The first flow chamber 41 serves as the initial inlet and has a small size, making it easy to control the initial flow rate. After the rubber material enters the second flow chamber 42 and the third flow chamber 43, the cross-sectional area gradually increases, causing the colloid to expand slowly and the speed to decrease, allowing the melt to spread naturally and maintain a laminar flow state. During this process, the heat-conducting arc block 5 continuously heats the material to maintain its high-temperature fluidity. The bottom of the discharge tube 4 has a rounded end face to eliminate dead corners, allowing the rubber material to flow out smoothly and facilitating feeding.

[0034] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A mold structure for convenient injection molding, comprising a mounting plate (1), an upper mold (2), and a lower mold (3), characterized in that: The upper mold (2) is set at the bottom of the mounting plate (1), and the lower mold (3) is set at the bottom of the upper mold (2). A drain pipe (11) is installed inside the mounting plate (1). A branch pipe (111) is fixedly connected to the outer surface of the drain pipe (11). A discharge pipe (4) is fixedly connected to the bottom of the branch pipe (111). A heat-conducting arc block (5) is set on the outer surface of the discharge pipe (4). An electric heating plate (51) is installed at the top of the heat-conducting arc block (5).

2. The mold structure for convenient injection molding as described in claim 1, characterized in that: The discharge pipe (4) includes a first flow chamber (41), a second flow chamber (42) and a third flow chamber (43), the diameters of the first flow chamber (41), the second flow chamber (42) and the third flow chamber (43) increasing sequentially.

3. The mold structure for convenient injection molding as described in claim 2, characterized in that: The drainage tube (11) is funnel-shaped, and the lowest end of the third flow cavity (43) is set as an arc.

4. The mold structure for convenient injection molding as described in claim 1, characterized in that: The upper mold (2) has a groove (21) at the top, and a pipe (211) is provided at the bottom of the inner wall of the groove (21). The heat-conducting arc block (5) is installed in the groove (21), and the discharge pipe (4) is set in correspondence with the pipe (211).

5. The mold structure for convenient injection molding as described in claim 4, characterized in that: A connecting ring (6) is installed at the top of the mounting plate (1). A feed pipe (61) is installed inside the connecting ring (6). The feed pipe (61) is connected to the drain pipe (11). A first locking bolt (62) is threaded between the connecting ring (6) and the mounting plate (1).

6. The mold structure for convenient injection molding as described in claim 5, characterized in that: An annular sealing gasket (7) is provided between the connecting ring (6) and the mounting plate (1), and the first locking bolt (62) passes through the annular sealing gasket (7).

7. The mold structure for convenient injection molding as described in claim 6, characterized in that: The outer surface of the connecting ring (6) is fitted with a first connecting plate (8), and the bottom end of the first connecting plate (8) is provided with a second connecting plate (9). A second locking bolt (81) is threaded between the first connecting plate (8) and the second connecting plate (9), and a third locking bolt (91) is threaded between the second connecting plate (9) and the upper mold (2).

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