Self-driven gas injection-water injection device capable of switching runners

Abstract

The invention belongs to the field of polymer forming and processing, and particularly relates to a gas-water injection device for a gas-water auxiliary injection molding process, which can realize self-driven switching of runners and is simple in structure. The device mainly comprises an injection mold, a gas injection-water injection valve, a conversion control valve, a normally closed two-position two-way electromagnetic valve I, a normally closed two-position two-way electromagnetic valve II, a one-way valve, a pressure gauge, a pressure regulator, a gas source, a water pump, a water source and the like. The gas injection-water injection valve is mounted on the injection mold through a valve body mounting bolt, so that the device is simple and convenient to mount, reliable and easy to replace; the conversion control valve is in threaded connection with the gas injection-water injection valve through a middle connecting rod; the gas / water path joint is in threaded connection with the conversion control valve; according to the device, a gas / water channel is innovatively concentrated in one valve body, a sliding block in the switching control valve is pushed to move through gas / water pressure, self-driven switching of the gas / water channel is achieved, and meanwhile, an injection port of a gas injection-water injection valve is automatically opened to complete injection. The device is simple in structure and convenient to assemble, self-driven switching is achieved, the manufacturing cost and the use cost can be effectively reduced, and the device is suitable for water injection and gas injection control of various gas-water-assisted injection molding and similar processes.

Description

Technical Field

[0001] The invention provides a gas injection-water injection device which can realize self-driven switching of flow channels and has a simple structure, and is suitable for water injection and gas injection control in polymer gas-water assisted injection molding process and similar processes. Background Art

[0002] Compared with traditional injection molding technology, gas-assisted injection molding and water-assisted injection molding have great advantages in terms of ensuring product quality, reducing costs, improving molding efficiency and molding size. The gas-assisted injection molding process has good external quality of parts, less material consumption and equipment loss, and is suitable for most thermoplastics; but the inner surface of the parts is prone to foaming during the injection molding process, and the quality is poor; and the wall thickness uniformity of larger pipes is poor. The water-assisted injection molding process has faster cooling, shorter molding cycle, thinner wall thickness, bright inner wall without foaming, and larger moldable diameter; but its molding material selection is more limited, and the range of applicable materials is narrow. It can be seen that gas-assisted injection molding and water-assisted injection molding each have advantages and limitations.

[0003] The process of gas-water assisted injection molding is as follows: first, the melt is injected into the mold cavity, and then high-pressure gas is injected to push the melt to fill the mold cavity or enter the overflow cavity to complete the filling, and then high-pressure water is injected for pressure maintenance and cooling. This process not only maintains the good material applicability and wall thickness uniformity of the gas-assisted injection molding process, but also has the good cooling performance and inner wall surface quality of the water-assisted injection molding process. Since this process combines the advantages of gas-assisted injection molding and water-assisted injection molding processes, it also breaks through their limitations and is expected to meet people's requirements for high quality, beautiful and comfortable, low consumption, and environmental protection of products. Therefore, this process has broad application prospects in the automotive industry, home appliances, office supplies, sports equipment, and children's toys.

[0004] As an indispensable and important component of gas-water assisted injection molding production equipment, the gas injection-water injection device has a significant impact on product quality. Most traditional water injection or gas injection devices can only inject one fluid alone, which cannot meet the process requirements; currently some devices have two fluid channels for water injection and gas injection, but fluid injection requires the cooperation of an external auxiliary valve device to complete the flow channel switching, and the device operation process is complicated and inefficient; at the same time, some devices that integrate the gas injection and water injection control functions have a complex structure, high assembly precision requirements, reduced reliability, and the risk of water and gas leakage. The gas injection-water injection device proposed in the present invention can autonomously realize the functions of gas injection and water injection in turn, and the operation and control process is simple and reliable, and has broad development prospects. Summary of the invention

[0005] In order to solve the aforementioned problems, the present invention proposes a gas injection-water injection device with a simple structure, self-driven flow channel switching, and reliable operation, which meets the actual needs of water injection and gas injection processes in gas-water assisted injection molding and similar processes.

[0006] The technical solution of the present invention is as follows: Figure 1 As shown, the device mainly consists of an injection mold (1), an air injection-water injection valve (2), a conversion control valve (4), a normally closed two-position two-way solenoid valve I (5) and a normally closed two-position two-way solenoid valve II (6), a one-way valve (10), a pressure gauge (7, 11), a pressure regulator (12), an air source (13), a water pump (8), a water source (9), etc. The air injection-water injection valve (2) is installed in the slot at the front end of the template through its lifting ear, and is fixed to the injection mold through the valve body mounting bolt (3), which is easy to install, reliable and easy to replace; the conversion control valve (4) is threadedly connected to the air injection-water injection valve (2) through the intermediate connecting rod (301); the high-pressure air pipe joint (303), the high-pressure water pipe joint (304) and the conversion joint (302) are threadedly connected to realize the connection of the air / water circuit.

[0007] As attached Figure 2 As shown, the gas injection-water injection valve (2) is mainly composed of a valve body (201), a plug (202), a weight-reducing through hole (203), an adjustable position flange (204), a valve core (205), a return spring (206), a sealing ring (207), and a valve body tapered hole block (208). The valve body (201) is installed in the slot at the front end of the template through its lifting ear, and is fixed to the injection mold through the valve body mounting bolts (3); the valve body tapered hole block (208) is installed on the valve body (201) through threaded connection, the valve core (205) is designed as a stepped shaft, and a conical fit is adopted between the upper end of the valve core and the valve body tapered hole block. The reset spring (206) is sleeved on the lower end of the valve core, and the adjustable position flange (204) is connected to the valve body through threads. By adjusting the flange, the reset spring is compressed to generate a pre-tightening force, pushing the valve core upward, so that the upper end of the valve core is in close contact with the valve body tapered hole block. With the help of the conical surface fit, the sealing of the valve body is ensured when the gas injection-water injection valve is closed, thereby preventing the melt from entering the valve body.

[0008] As attached Figure 3As shown, the conversion control valve (4) includes an intermediate connecting rod (301), a conversion joint (302), a high-pressure air pipe joint (303), a high-pressure water pipe joint (304), a slider (306), rubber washers (305, 307), etc. The upper end of the intermediate connecting rod (301) is connected to the air injection-water injection valve (2) by threading, and the lower end is connected to the conversion joint (302) by threading, which is easy to install and easy to disassemble. The two ends of the conversion joint (302) are connected to the high-pressure air pipe joint (303) and the high-pressure water pipe joint (304) by threading. The slider (306) is installed in the internal through hole of the conversion joint, with clearance fit, and when fluid is injected, it can slide left and right under the push of the fluid. The rubber gaskets (305, 307) are installed on the raised parts at both ends of the slider. When high-pressure gas is injected, the side of the rubber gasket (305) contacts the high-pressure water pipe joint (304) to form a seal. When high-pressure water is injected, the side of the rubber gasket (307) contacts the high-pressure gas pipe joint (303) to form a seal to prevent air and water leakage. When the solenoid valve I (5) / solenoid valve II (6) is powered on, the high-pressure gas / water enters the conversion joint through the high-pressure gas / water joint, and the gas / water pushes the slider to move to realize the self-driven switching of the flow channel, and enters the gas injection-water injection valve through the middle connecting rod. The high-pressure gas / water pushes the valve core to compress the reset spring to open the injection port and complete the gas / water injection. When the gas / water injection stops, the reset spring pushes the valve core to move upward, the injection port is closed, and a seal is formed.

[0009] Compared with the prior art, the present invention has the following advantages:

[0010] (1) The device effectively realizes the function of gas injection and water injection through the cooperation of the gas injection and water injection valve assembly, the conversion control valve assembly, and the solenoid valve assembly. The operation and control are simple, independent of each other, and the structure is reliable. (2) The upper end of the valve core and the valve body adopt a conical fit. The conical surface fit ensures the sealing of the gas injection and water injection valve when it is closed, preventing the melt from entering the valve body. (3) The water circuit and the gas circuit are innovatively integrated into one valve body, meeting the requirements of gas-water assisted injection molding process and similar processes for multiple fluid injection. (4) With two normally closed two-position two-way solenoid valves, automatic control of air / water intake can be realized. When the solenoid valve is powered off and closed, the injection port is closed to form a seal. When the valve core is open, the solenoid valve I is powered on for gas injection, and when the valve core is open, the solenoid valve II is powered on for water injection, realizing gas injection and water injection with reliable operation. (5) The self-driven switching between gas injection and water injection is achieved through the conversion control valve, which simplifies the gas injection and water injection valve structure, reduces the processing cost, and makes the subsequent maintenance simple and convenient; (6) The slider is pushed by high-pressure gas / water to move, so as to realize the self-driven switching of water injection and gas injection flow channels, simplify the external auxiliary valve device for flow channel switching, reduce the operating cost, and simplify the operating process. (7) The valve core is pushed downward by high-pressure gas / water to squeeze the reset spring, so that the injection port is automatically opened to complete the injection molding work. When the air / water is stopped, the reset spring pushes the valve core upward to realize the automatic closing of the injection port. No external power equipment is required, and the operation is reliable. (8) By adjusting the flange, the preload force between the reset spring and the valve core can be preset to realize the gas injection and water injection processes under different gas / water pressure conditions; BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the general assembly of the device of the present invention.

[0012] Figure 2 This is a schematic diagram of the structure of the gas injection-water injection valve of the present invention.

[0013] Figure 3 It is a schematic diagram of the structure of the conversion control valve of the present invention.

[0014] Figure 4 This is a working principle diagram of the melt injection process.

[0015] Figure 5 Working principle diagram of gas injection process.

[0016] Figure 6 This is a working principle diagram of the water injection process.

[0017] Figure 7 This is the working principle diagram of the gas injection and drainage process. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0019] The device mainly comprises an injection mold (1), an air-water injection valve (2), a conversion control valve (4), a normally closed two-position two-way solenoid valve I (5) and a normally closed two-position two-way solenoid valve II (6), a one-way valve (10), a pressure gauge (7, 11), a pressure regulator (12), an air source (13), a water pump (8), a water source (9), etc. The air-water injection valve (2) mainly comprises a valve body (201), a plug (202), a weight-reducing through hole (203), an adjustable position flange (204), a valve core (205), a reset spring (206), a sealing ring (207), and a valve body tapered hole block (208). The conversion control valve (4) comprises an intermediate connecting rod (301), a conversion joint (302), a high-pressure air pipe joint (303), a high-pressure water pipe joint (304), a slider (306), a rubber gasket (305, 307), etc. The air-water injection valve (2) is installed in the slot at the front end of the template through its lifting ear, and is fixed on the injection mold through the valve body mounting bolt (3); the conversion control valve (4) is threadedly connected to the air-water injection valve (2) through the intermediate connecting rod (301); the high-pressure air pipe joint (303), the high-pressure water pipe joint (304) and the conversion joint (302) are threadedly connected to realize the connection of the air / water path; by adjusting the flange (204), the preload between the return spring (206) and the valve core (205) can be preset to realize the air injection and water injection processes under different air / water pressure conditions; the slider (306) is pushed by the high-pressure air / water to move, so as to realize the self-driven switching flow channel of water injection and air injection; the valve core (205) is pushed downward by the high-pressure air / water to squeeze the return spring (206), so as to realize the automatic opening of the injection port to complete the injection molding work; when the air / water is stopped, the return spring pushes the valve core upward to realize the automatic closing of the injection port. No external power equipment is required, and the operation is reliable. Through the control of solenoid valves (Ⅰ, Ⅱ), gas injection and water injection can be achieved in turn.

[0020] Implementation Cases

[0021] Melt injection process Figure 4 As shown: by adjusting the position of the flange (204) and presetting the preload of the return spring (206), the valve core (205) is in a closed state, and a conical fit is adopted between the upper end of the valve core and the valve body conical hole block (208) to ensure the sealing of the air-water injection valve (2) when it is closed, and prevent the melt from entering the valve body. The two-position two-way solenoid valves I (5) and II (6) are both powered off, and the air and water intake are stopped. At this time, a certain amount of melt is injected into the closed cavity.

[0022] The gas injection process is as follows: Figure 5As shown: the two-position two-way solenoid valve I (5) is powered on, the gas source (13) is opened, and the high-pressure gas passes through the pressure regulator (12), the pressure gauge (11), and the one-way valve (10) in sequence, and enters the high-pressure gas pipe joint (303) from the A end of the solenoid valve I (5), and enters the air inlet channel of the conversion joint (302). The high-pressure gas pushes the slider (306) to slide, and the protruding part of the end of the slider (306) is inserted into the high-pressure water pipe joint (304). The side of the rubber gasket (305) contacts the port of the high-pressure water pipe joint (304) to form a seal to prevent air leakage. The gas enters the gas injection-water injection valve (2) through the internal through hole of the intermediate connecting rod (301), and the high-pressure gas pushes the valve core (205) to compress the reset spring (206) downward to open the injection port, complete the gas injection, and realize the melt penetration.

[0023] The water injection process Figure 6 As shown: the two-position two-way solenoid valve II (6) is powered on, the water source (9) is turned on, and the high-pressure water passes through the water pump (8) and the pressure gauge (7) in turn, and enters the high-pressure water pipe joint (304) from the A end of the solenoid valve II (6), and enters the water inlet channel of the conversion joint (302). The high-pressure water pushes the slider (306) to slide, and the protruding part of the end of the slider (3) is inserted into the high-pressure gas pipe joint (303). The side of the rubber gasket (307) contacts the port of the high-pressure gas pipe joint (303) to form a seal to prevent water leakage. The high-pressure water enters the gas injection-water injection valve (2) through the internal through hole of the middle connecting rod (301), and the high-pressure water pushes the valve core (205) to compress the reset spring (206) downward to open the injection port, complete the water injection, and realize the cooling and pressure maintenance of the product. The gas and water are discharged through the external drainage device.

[0024] The gas injection and drainage process Figure 7 As shown: the two-position two-way solenoid valve I (5) is powered on, the gas source (13) is opened, and the high-pressure gas is input from the A end of the solenoid valve I (5) into the high-pressure gas pipe joint (303), and enters the air inlet channel of the conversion joint (302). The high-pressure gas pushes the slider (306) to slide, and the protruding part of the end of the slider (306) is inserted into the high-pressure water pipe joint (304). The side of the rubber gasket (305) contacts the port of the high-pressure water pipe joint (304) to form a seal to prevent air leakage. The gas enters the gas injection-water injection valve (2) through the internal through hole of the intermediate connecting rod (301), and the high-pressure gas pushes the valve core (205) to compress the reset spring (206) downward to open the injection port, and the high-pressure gas enters the product cavity for drainage.

Claims

1. A gas injection-water injection device with a simple structure that can realize self-driven switching of flow channels, the present invention Features: The device integrates a water valve and an air valve together, has a simple structure, and can realize self-driven switching of a flow channel. The device mainly comprises an injection mold (1), an air-water injection valve (2), a conversion control valve (4), a normally closed two-position two-way solenoid valve I (5) and a normally closed two-position two-way solenoid valve II (6), a one-way valve (10), a pressure gauge (7, 11), a pressure regulator (12), an air source (13), a water pump (8), a water source (9), etc. The air-water injection valve (2) mainly comprises a valve body (201), a plug (202), a weight-reducing through hole (203), an adjustable position flange (204), a valve core (205), a reset spring (206), a sealing ring (207), and a valve body tapered hole block (208). The conversion control valve (4) includes an intermediate connecting rod (301), a conversion joint (302), a high-pressure gas pipe joint (303), a high-pressure water pipe joint (304), a slider (306), a rubber gasket (305, 307), etc. The gas injection-water injection valve (2) is installed in the slot at the front end of the template through its lifting ear, and is fixed to the injection mold through the valve body mounting bolt (3); the conversion control valve (4) is threadedly connected to the gas injection-water injection valve (2) through the intermediate connecting rod (301); the high-pressure gas pipe joint (303), the high-pressure water pipe joint (304) and the conversion joint (302) are threadedly connected to realize the gas / water circuit connection; the solenoid valve I (5) is energized, the gas source (13) is opened, and the high-pressure gas is input from the A end of the solenoid valve I (5) into the high-pressure gas pipe joint. (303), enters the air inlet channel of the conversion joint (302), the high-pressure gas pushes the slider (306) to slide, the raised part of the end of the slider (306) is inserted into the high-pressure water pipe joint (304), and the side of the rubber gasket (305) contacts the port of the high-pressure water pipe joint (304) to form a seal; the gas enters the gas injection-water injection valve (2) through the internal through hole of the middle connecting rod (301), and the high-pressure gas pushes the valve core (205) downward to compress the reset spring (206), so that the injection port is opened and gas injection is achieved. When the electromagnetic valve II (6) is powered on and the water source (9) is opened, high-pressure water passes through the water pump (8) and the pressure gauge (7) in sequence, and is input into the high-pressure water pipe connector (304) from the A end of the electromagnetic valve II (6), and enters the water inlet channel of the conversion connector (302). The high-pressure water pushes the slider (306) to slide, and the raised portion of the end of the slider (3) is inserted into the interior of the high-pressure air pipe connector (303). The side of the rubber gasket (307) contacts the port of the high-pressure air pipe connector (303) to form a seal; the high-pressure water enters the air injection-water injection valve (2) through the internal through hole of the intermediate connecting rod (301), and the high-pressure water pushes the valve core (205) downward to compress the return spring (206), thereby opening the injection port and achieving water injection.

2. A gas injection-water injection device with a simple structure that can realize self-driven switching of flow channels according to claim 1, Features: The device effectively realizes the functions of gas injection and water injection by the cooperation of the gas injection and water injection valve assembly, the conversion control valve assembly and the solenoid valve assembly. The operation and control are simple, the devices are independent of each other and the structure is reliable.

3. According to claim 1, a gas injection-water injection device with a simple structure that can realize self-driven switching of flow channels, Features: The conversion control valve is used to realize the self-driven switching of the water injection and gas injection channels. It has a simple structure, reliable operation, simplifies the injection unit structure, and reduces processing costs.

4. A gas injection-water injection device with a simple structure that can realize self-driven switching of flow channels according to claim 1, Features: The innovative integration of water and gas circuits into one valve body meets the needs of multiple fluid injection in gas-water assisted injection molding and similar processes.

5. According to claim 1, a gas injection-water injection device with a simple structure that can realize self-driven switching of flow channels, Features: The slider is pushed to move by high-pressure gas / water to realize self-driven switching of flow channels by water and gas injection, which simplifies the external auxiliary valve device for flow channel switching, reduces operating costs, simplifies the operating process, and improves production efficiency.

6. A gas injection-water injection device with a simple structure capable of realizing self-driven flow channel switching according to claim 1, Features: The valve core is pushed downward by high-pressure air / water, squeezing the return spring to open the injection port automatically and complete the injection molding. When the air / water is stopped, the return spring pushes the valve core upward to close the injection port automatically. No external power equipment is required, and the action is reliable.

7. A gas injection-water injection device with a simple structure capable of realizing self-driven flow channel switching according to claim 1, Features: By adjusting the flange, the preload force between the return spring and the valve core can be preset to achieve gas injection and water injection processes under different gas / water pressure conditions.

8. A gas injection-water injection device with a simple structure capable of realizing self-driven flow channel switching according to claim 1, Features: The valve core is provided with stepped sections and a return spring is installed, and the return spring ensures that the valve core is returned to its original position and closed.

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