A new labyrinth venting overflow structure

Abstract

The utility model discloses a novel labyrinth exhaust overflow structure is located on reaction injection molding mould, include: overflow tank, is set up in the recessed die cavity side of reaction injection molding mould, and is communicated with the die cavity setting, exhaust passage, one end communicates with overflow tank, another end communicates with vacuum pump through gas circuit pipeline, and the control assembly of control gas circuit opening and closing is arranged between another end of exhaust passage and gas circuit pipeline, drainage channel is formed by the groove between the rib between the die cavity face of female die, and drainage channel is open to the sky and is set up on the side facing male die, is provided with the notch on the side close to overflow tank, after male die and female die close, and the open mouth of drainage channel is closed to the plastic part, to make drainage channel form both ends open flow passage structure, one end communicates recessed die cavity side, and another end communicates overflow tank, the application has improved product forming quality and production stability, has reduced the scrap rate, the utility model relates to injection molding mould technical field.

Description

Technical Field

[0001] This utility model relates to the field of reaction injection molding technology, and more specifically to a novel labyrinth venting overflow structure. Background Technology

[0002] Automotive interiors mainly refer to automotive products used for interior modifications of cars, covering all aspects of the car's interior, such as steering wheel covers, door panels, B-pillars, C-pillars, refrigerator covers, air vents, center consoles, dashboards, etc.

[0003] High-gloss thin-walled PUR (polyurethane) parts require rapid venting of the mold cavity. If the venting effect is not up to standard, air bubbles and trapped air defects will occur during the casting process, resulting in poor product yield. Existing vacuum overflow solutions suffer from pipe blockage, burrs, and high costs in subsequent processes due to raw material directly flowing into the pipeline, delayed sealing, and difficulty in removing overflow material. Utility Model Content

[0004] To address the shortcomings and defects of existing technologies, a novel labyrinth venting overflow structure is provided, which improves product molding quality and production stability while reducing scrap rate.

[0005] A novel labyrinth venting overflow structure, disposed on a reaction injection molding die, includes: An overflow groove is formed on the concave cavity side of the reaction injection molding mold and is connected to the cavity. The exhaust channel is connected to the overflow tank at one end and to the vacuum pump at the other end through the gas pipeline. A control component for controlling the opening and closing of the gas pipeline is installed between the other end of the exhaust channel and the gas pipeline. The drainage channel is formed by the channels between the ribs protruding from the cavity surface of the die, and the drainage channel is open on the side facing the punch, with a notch on the side near the overflow groove. After the punch and die are closed, the plastic parts will close the opening of the drainage channel so that the drainage channel forms a flow channel structure with two open ends, one end of which is connected to the cavity side of the die and the other end is connected to the overflow groove. During casting, the control component controls the air path to open, and the vacuum pump extracts the gas from the mold cavity through the air path pipe and overflow groove. When the raw material is fed in, it flows into the overflow groove, and the control component controls the air path to close to achieve sealing.

[0006] With the above structure, the novel labyrinth exhaust overflow structure of this utility model has the following advantages compared with the prior art: The overflow tank is connected to the vacuum pump via an exhaust channel and control components. When the punch and die separate, the plastic part is placed into the cavity of the die. After the punch and die close, the plastic part closes the opening of the flow channel, so that the flow channel forms a flow channel structure. After the mold is closed, the control component connects the exhaust channel and the air passage. The vacuum pump extracts the gas from the air passage, exhaust channel, overflow groove, flow channel structure and cavity, making the mold a vacuum. After the raw material is injected, the plastic quickly fills the cavity, thereby effectively reducing the occurrence of air bubbles and trapped air defects during the injection molding process. When raw materials flow into the overflow tank through the flow channel structure, the control component closes the exhaust channel in time to prevent materials from entering and clogging the exhaust system; The exhaust system ensures that gas can only be discharged in one direction, making exhaust reliable, improving product molding quality and production stability, and reducing scrap rate.

[0007] As an improvement of this utility model, the overflow groove is formed by the recessed cavity wall of the concave model, creating a groove that extends vertically. The overflow trough has a hole at the top near the bottom, which connects to the exhaust channel.

[0008] As an improvement of this utility model, the ribs are arranged to make the channel detour at least twice, forming a maze path, so that the gas or raw material turns multiple times during the passage.

[0009] As an improvement of this utility model, the exhaust channel is a straight hole extending vertically. The gas pipeline is connected to the side wall of the exhaust channel. The control component includes an exhaust needle that extends into the exhaust channel and a drive unit that drives the exhaust needle to move up and down, such that the exhaust needle has a position where the air passage is exposed or covered during its movement.

[0010] As an improvement of this utility model, the driving unit is a hydraulic telescopic rod. The die cavity is provided with a support, and the support is connected to a slider via a guide structure. The venting pin is fixedly connected to the slider. The hydraulic telescopic rod is connected to the bracket, and its output end is connected to the slider, which is used to drive the slider to move up and down under the guidance of the guide structure.

[0011] As an improvement of this utility model, the guide structure comprises a groove and a mating block. The slide groove is arranged to extend vertically on the support, and the engaging block is arranged on the slider and engaging with the slide groove. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure arranged on the concave mold cavity of this utility model.

[0013] Figure 2 This is a three-dimensional structural diagram of the present invention arranged on a concave mold cavity.

[0014] Figure 3 This is the utility model Figure 2 Schematic diagram of the structure at point A in the middle.

[0015] Figure 4 This is a side view of the structure of this utility model.

[0016] Figure 5 This is the utility model Figure 4 Enlarged schematic diagram of the cross-sectional structure along the BB direction.

[0017] Figure 6 This is the utility model Figure 5 Enlarged schematic diagram of the structure at point D.

[0018] Figure 7 This is the utility model Figure 4 Schematic diagram of the cross-sectional structure along the CC direction.

[0019] The figure shows: 1. Die cavity; 1.1 Die cavity; 2. Overflow groove; 2.1 Hole; 3. Exhaust channel; 4. Control component; 4.1 Exhaust needle; 4.2 Drive unit; 4.21 Hydraulic telescopic rod; 5. Drainage channel; 5.1 Rib; 5.2 Notch; 6. Air passage; 6.1 Vacuum pump; 7. Support; 7.1 Slide groove; 8. Slider; 8.1 Mating block. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] Please see Figure 1-7 As shown, A novel labyrinth venting overflow structure, disposed on a reaction injection molding die, includes: Overflow groove 2 is provided on the concave cavity 1.1 side of the reaction injection molding mold and is connected to the cavity; The exhaust channel 3 is connected to the overflow tank 2 at one end and to the vacuum pump through the gas pipeline 6 at the other end. A control component 4 for controlling the opening and closing of the gas pipeline is provided between the other end of the exhaust channel 3 and the gas pipeline 6. The drainage channel 5 is formed by a channel between the ribs 5.1 protruding from the cavity surface of the die 1, and the drainage channel 5 is open on the side facing the punch, and has a notch 5.2 on the side near the overflow groove 2. After the punch and die 1 are closed, the plastic parts close the opening of the flow channel 5 so that the flow channel 5 forms a flow channel structure with openings at both ends, one end of which is connected to the side of the die cavity 1.1, and the other end is connected to the overflow groove 2 through the notch 5.2. During casting, the control component 4 controls the air path to open, and the vacuum pump extracts the gas from the mold cavity through the air path pipe 6 and the overflow groove 2. When the raw material is fed in, it flows into the overflow groove 2, and the control component 4 controls the air path to close to achieve sealing.

[0022] Overflow tank 2 is connected to vacuum pump via exhaust channel 3 and control component 4. When the punch and die 1 separate, the plastic part is placed into the cavity of the die 1. After the punch and die 1 close, the plastic part closes the opening of the flow channel 5, so that the flow channel 5 forms a flow channel structure. After the mold is closed, the control component 4 connects the exhaust channel 3 and the air passage 6. The vacuum pump 6.1 extracts the air passage 6, exhaust channel 3, overflow groove 2, flow channel structure and the gas in the cavity, making the mold a vacuum state. After the raw material is injected, the polyurethane quickly fills the cavity, thereby effectively reducing the occurrence of bubbles and trapped air defects during the injection molding process. When the raw material flows into the overflow tank 2 through the flow channel structure, the control component 4 closes the exhaust channel 3 in time to prevent the material from entering and blocking the exhaust system. The exhaust system ensures that gas can only be discharged in one direction, making exhaust reliable, improving product molding quality and production stability, and reducing scrap rate.

[0023] Please see Figure 3 As shown, in some embodiments, the overflow groove 2 is a groove extending vertically formed by the downward sinking of the wall of the concave mold cavity 1.1. An opening 2.1 is made at the upper part of the overflow channel 2 near the bottom of the channel, which is connected to the exhaust channel 3.

[0024] After the polyurethane enters, it first deposits at the bottom. The liquid level covers the orifice of the pore 2.1. The liquid seal is completed by closing the exhaust channel 3 and closing the raw material injection to prevent the raw material from entering the exhaust system.

[0025] In some embodiments, the ribs 5.1 are arranged to cause the channel to detour at least twice, forming a labyrinthine path, so that the gas or raw material is deflected multiple times during its passage, mainly to reduce the flow rate and pressure of the melt as it passes through, so as to ensure timely sealing response and prevent material from entering and clogging the venting system.

[0026] Please see Figure 5-6 As shown, in some embodiments, the exhaust channel 3 is a straight hole extending vertically. The gas duct 6 is connected to the side wall of the exhaust channel 3. The control component 4 includes an exhaust needle 4.1 that extends into the exhaust passage 3, and a drive unit 4.2 that drives the exhaust needle 4.1 to move up and down. During the movement of the exhaust needle 4.1, the air passage 6 is either exposed or covered.

[0027] The vent needle 4.1 has a first position state and a second position state. First position: The exhaust needle 4.1 moves upward to above the opening on the side wall of the air passage 6, exposing the air passage 6. Second position: The exhaust needle 4.1 moves down to face the side wall opening of the air passage 6, and the air passage 6 is blocked. The drive unit 4.2 drives the exhaust needle 4.1 to move up and down, switching between the two positions mentioned above, thereby opening or closing the air passage 6. It features a simple structure and stable operation. Furthermore, its structural design makes it easier to prevent raw materials from entering.

[0028] Please see Figure 1 , 7 As shown, in some embodiments, the drive unit 4.2 is a hydraulic telescopic rod 4.21. The die cavity 1 is provided with a support 7, and the support 7 is connected to a slider 8 through a guide structure. The venting pin 4.1 is fixedly connected to the slider 8. The hydraulic telescopic rod 4.21 is connected to the bracket 7, and its output end is connected to the slider 8, which is used to drive the slider 8 to move up and down under the guidance of the guide structure.

[0029] The slide block 8 is driven up and down by the hydraulic telescopic rod 4.21, which in turn drives the exhaust needle 4.1 to move up and down in the exhaust channel 3. The hydraulic drive has a large force, so even if the raw material enters the exhaust channel 3, the residual raw material can be forcibly pushed out when the exhaust needle 4.1 moves down, and there will be no jamming or other problems.

[0030] In some embodiments, the guide structure comprises a groove 7.1 and a mating block 8.1. The slide groove 7.1 is arranged to extend vertically on the bracket 7, and the mating block 8.1 is arranged on the slider 8 and mating block 8.1 is mated with the slide groove 7.1. This embodiment has the characteristics of simple structure, stable operation and low cost.

[0031] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within its protection scope.

Claims

1. A novel labyrinth venting overflow structure, disposed on a reaction injection molding die, characterized in that, include: An overflow groove (2) is provided on the concave cavity (1.1) side of the reaction injection molding mold and is connected to the cavity. The exhaust channel (3) is connected to the overflow tank (2) at one end and to the vacuum pump through the gas pipeline (6) at the other end. A control component (4) for controlling the opening and closing of the gas pipeline is provided between the other end of the exhaust channel (3) and the gas pipeline (6). The drainage channel (5) is formed by the channel between the ribs (5.1) protruding from the cavity surface of the die (1), and the drainage channel (5) is open on the side facing the punch, and has a notch (5.2) on the side near the overflow channel (2). After the punch and die (1) are closed, the plastic parts will close the opening of the drainage channel (5) so that the drainage channel (5) forms a flow channel structure with two open ends, one end of which is connected to the cavity (1.1) side of the die and the other end is connected to the overflow groove (2). During casting, the control component (4) controls the air path to open, and the vacuum pump extracts the gas from the mold cavity through the air path pipe (6) and the overflow groove (2). When the raw material is sent in, it flows into the overflow groove (2), and the control component (4) controls the air path to close to achieve sealing.

2. The novel labyrinth exhaust overflow structure according to claim 1, characterized in that: The overflow groove (2) is formed by the downward sinking of the wall of the concave mold cavity (1.1) to create a groove that extends vertically. The overflow trough (2) has a hole (2.1) at the upper part near the bottom of the trough, which is connected to the exhaust channel (3).

3. The novel labyrinth exhaust overflow structure according to claim 1, characterized in that: The ribs (5.1) are arranged to cause the channel to detour at least twice, forming a maze path that causes the gas or raw material to detour multiple times during its passage.

4. The novel labyrinth exhaust overflow structure according to claim 1, characterized in that: The exhaust channel (3) is a straight hole extending vertically. The gas pipeline (6) is connected to the side wall of the exhaust channel (3). The control component (4) includes an exhaust needle (4.1) that extends into the exhaust passage (3) and a drive unit (4.2) that drives the exhaust needle (4.1) to move up and down, wherein the exhaust needle (4.1) has a position where the air passage (6) is exposed or covered during its movement.

5. The novel labyrinth exhaust overflow structure according to claim 4, characterized in that: The drive unit (4.2) is a hydraulic telescopic rod (4.21). The die (1) is provided with a bracket (7), and the bracket (7) is connected to a slider (8) through a guide structure. The venting pin (4.1) is fixedly connected to the slider (8). The hydraulic telescopic rod (4.21) is connected to the bracket (7) and its output end is connected to the slider (8) to drive the slider (8) to move up and down under the guidance of the guide structure.

6. The novel labyrinth exhaust overflow structure according to claim 5, characterized in that: The guiding structure consists of a groove (7.1) and a mating block (8.1). The groove (7.1) is arranged in a vertically extending structure on the bracket (7), and the mating block (8.1) is arranged on the slider (8), and the mating block (8.1) is mated with the groove (7.1).

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