High-vacuum active closing type hydraulic vacuum valve for die-casting machine die

Abstract

The utility model discloses a high-vacuum active closing type hydraulic vacuum valve for a die-casting machine die, which comprises a shell, a one-way valve arranged on one side of the bottom of the shell, a hydraulic cylinder arranged on one side of the one-way valve, a conveying pipe arranged on the other side of the one-way valve, a vacuum valve arranged on one side of the conveying pipe, and a vacuum pump arranged on one side of the vacuum valve. A mold cavity channel is formed in the vacuum valve, a valve element is arranged in the mold cavity channel, a cone valve mechanism is arranged on one side of the mold cavity channel, a vacuum pumping pipe is arranged on one side of the cone valve mechanism, the vacuum pumping efficiency and the casting quality are remarkably improved through the design of the valve element capable of responding quickly, and the valve is reasonable in structure, easy and convenient to operate and high in practicability. The high vacuum state can be achieved and maintained in a short time, air holes and defects in the casting are effectively reduced, the overall quality of the casting is improved, and meanwhile the production efficiency is greatly improved through the optimized operation process.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic vacuum valves, and more specifically, to a high-vacuum active closed hydraulic vacuum valve for die-casting machine molds. Background Art

[0002] In traditional die-casting processes, the gas inside the mold cavity often cannot be completely exhausted, resulting in defects such as pores inside the castings. To solve this problem, a vacuum pumping method is usually adopted to extract the air inside the mold cavity to create a negative pressure environment, promoting the filling and solidification of the molten metal. However, existing vacuum valves mostly have problems such as inconvenient operation, poor sealing performance, and slow response speed, and cannot meet the production requirements of high efficiency and high quality;

[0003] After retrieval, the existing patent (publication number: CN218719244U) discloses a high-vacuum active closed hydraulic vacuum valve, including a valve body. An adjusting rod is installed in the valve body through a bearing. A rotating seat is welded on the adjusting rod. The rotating seat contacts the valve body. A limiting mechanism is arranged on the valve body. A connecting pipe is connected to the valve body by screws. An end cover is threadedly connected to the outside of the connecting pipe. A conical sleeve is slidably connected inside the end cover. The conical sleeve is slidably connected to the connecting pipe. By setting structures such as an end cover, a conical sleeve, a sliding ring, a slider, a chute, a compression spring, a plug rod, and a plug slot, through the threaded movement of the rotating end cover and the connecting pipe, after the external pipeline and the connecting pipe are connected, the conical sleeve can be deformed and pressed tightly. The inventor found the following problems in the process of implementing the present utility model:

[0004] Most existing vacuum valves are manually operated, requiring operators to monitor and adjust in real time, increasing labor intensity and the risk of errors. The sealing performance of some vacuum valves is insufficient, resulting in air leakage during the vacuum pumping process and unable to achieve the expected high vacuum degree. In addition, the response speed of some vacuum valves is relatively slow, unable to complete the vacuum pumping process in a short time, affecting production efficiency. At the same time, the structures of some vacuum valves are complex, and the maintenance and replacement of parts are relatively cumbersome, increasing the use cost;

[0005] Therefore, a high-vacuum active closed hydraulic vacuum valve for die-casting machine molds is proposed to solve the above problems. Summary of the Invention

[0006] In order to overcome the above-mentioned defects of the prior art, the present utility model provides a high-vacuum active closed hydraulic vacuum valve for die-casting machine molds to solve the problems raised in the above background art.

[0007] To achieve the above object, the present utility model provides the following technical solution: A high-vacuum active closed hydraulic vacuum valve for a die-casting machine mold, including a housing, on one side of the bottom of the housing is provided a check valve, on one side of the check valve is provided a hydraulic cylinder, on the other side of the check valve is provided a delivery pipe, on one side of the delivery pipe is provided a vacuum valve, on one side of the vacuum valve is provided a vacuum pump, inside the vacuum valve is provided a mold cavity passage, inside the mold cavity passage is provided a valve core, on one side of the mold cavity passage is provided a cone valve mechanism, and on one side of the cone valve mechanism is provided a vacuum pumping pipe.

[0008] Preferably, on one side of the mold cavity passage is provided an oil plug, there are two groups of oil plugs, and the two groups of oil plugs are evenly arranged along the vertical direction of the mold cavity passage.

[0009] Preferably, on the connection surfaces of the delivery pipe and the vacuum pumping pipe with the housing are provided sealing rings, and the sealing rings are in an O shape.

[0010] Preferably, on one side of the valve core is provided a first spring, and the valve core is connected to the mold cavity passage through the first spring. After the hydraulic cylinder is started, it can push the valve core to displace along the mold cavity passage, so that the vacuum pump is connected to the vacuum pumping pipe.

[0011] Preferably, the cone valve mechanism includes a screw cap, an adjusting rod, a second spring, a cone valve and a cone valve seat. On one side of the screw cap is provided the adjusting rod, on one side of the adjusting rod is provided the second spring, on one side of the second spring is provided the cone valve, and on one side of the cone valve is provided the cone valve seat.

[0012] Preferably, by the screw cap, the adjusting rod can make a circular motion, so that the cone valve moves up and down along the vertical direction of the cone valve seat.

[0013] Preferably, on one side of the outer wall of the check valve is provided a handle.

[0014] The technical effects and advantages of the present utility model:

[0015] Compared with the prior art, this high-vacuum active closed hydraulic vacuum valve for a die-casting machine mold greatly shortens the vacuum pumping time through the fast reaction speed of the hydraulic vacuum valve, thus accelerating the production process. At the same time, the simplified operation process and structural design make the equipment easier to use and maintain, reducing the operation time and possible operation errors.

[0016] Compared with the prior art, this high-vacuum active closing hydraulic vacuum valve for die-casting machine molds ensures a higher vacuum degree through optimized sealing design and structure, effectively reducing pores and other defects in the castings. This design can quickly close after reaching the predetermined vacuum degree, maintaining a stable high-vacuum environment, which helps the filling and solidification of the molten metal, thereby improving the overall quality of the castings. Brief Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the overall sectional structure of the present invention.

[0018] Figure 2 It is a schematic diagram of the overall outer three-dimensional structure of the present invention.

[0019] Figure 3 It is a schematic diagram of the partial sectional structure of the vacuum valve of the present invention.

[0020] Reference numerals are: 1, outer shell; 2, check valve; 3, hydraulic cylinder; 4, delivery pipe; 5, vacuum valve; 6, vacuum pump; 7, cavity channel; 8, valve core; 9, cone valve mechanism; 10, vacuum pumping pipe; 11, oil plug; 12, sealing ring; 13, first spring; 14, screw cap; 15, adjusting rod; 16, second spring; 17, cone valve; 18, cone valve seat; 19, handle. Detailed Embodiments

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment 1

[0022] As shown in the attached Figures 1 to 3A high-vacuum active shut-off hydraulic vacuum valve for a die-casting machine mold, as shown, includes a housing 1 made of stainless steel. The housing 1 is rectangular in shape, ensuring that it can withstand the pressure generated during the operation of the internal hydraulic and vacuum systems, while preventing external dust and impurities from affecting the operation of internal parts. A check valve 2 is provided on one side of the bottom of the housing 1, and a hydraulic cylinder 3 is provided on one side of the check valve 2. The main function of the check valve 2 is to allow hydraulic oil to flow in only one direction, preventing backflow. At the same time, the check valve 2 is arranged at the bottom of the device, which helps to use gravity to assist in closing the valve and enhance its sealing performance. The function of the hydraulic cylinder 3 is to push the valve core 8 to displace in the cavity channel 7, so that the vacuum pump 6 is connected to the vacuum valve 5. This mechanical push ensures the rapid opening and closing of the vacuum valve 5, with a fast response speed, meeting the requirements of high-efficiency production, and ensuring more precise control of pressure and flow in the hydraulic system.

[0023] On the other side of the check valve 2, a delivery pipe 4 is provided. The delivery pipe 4 is made of stainless steel. This pipe ensures that hydraulic oil can flow from the check valve 2 to the vacuum valve 5 efficiently and stably. A vacuum valve 5 is provided on one side of the delivery pipe 4. The vacuum valve 5 works through the cavity channel 7 and the valve core 8 arranged inside. When vacuum needs to be pumped, the hydraulic cylinder 3 starts, pushing the valve core 8 to open, so that a passage is formed between the cavity channel 7 and the vacuum pump 6. After reaching the predetermined vacuum degree, the hydraulic cylinder 3 acts in the reverse direction to pull the valve core 8 to close, cutting off the connection between the vacuum pump 6 and the cavity channel 7. This fast-switching design enables the vacuum valve 5 to respond within a short time, improving production efficiency and reducing energy waste. A vacuum pump 6 is provided on one side of the vacuum valve 5. The vacuum pump 6 uses a piston pump, which is commonly used in applications that require quickly reaching a high vacuum degree. Through the power of the vacuum pump 6, the vacuum valve 5 can respond quickly to opening and closing. Inside the vacuum valve 5, there is a cavity channel 7, and inside the cavity channel 7, there is a valve core 8. The size design of the cavity channel 7 can ensure sufficient flow to quickly reach the required vacuum degree. The opening and closing of the vacuum valve 5 are controlled through the cooperation of the cavity channel 7 and the valve core 8. The size and shape of the valve core 8 closely match the cavity channel 7 to achieve a good sealing effect. A cone valve mechanism 9 is provided on one side of the cavity channel 7, and a vacuum pumping pipe 10 is provided on one side of the cone valve mechanism 9. Through the cone valve mechanism 9, the channel size of the vacuum pumping pipe 10 can be adjusted, thereby precisely controlling the vacuum pumping speed of the device and helping to reduce energy loss. Embodiment 2

[0024] Based on Embodiment 1, the solution in Embodiment 1 is further refined and introduced in combination with the following specific working methods, as Figures 1 to 3 shown, and the details are described below:

[0025] As a preferred embodiment, two oil plugs 11 are provided on one side of the cavity channel 7, and the two oil plugs 11 are evenly arranged along the vertical direction of the cavity channel 7. Further, the oil plugs 11 can be disassembled. In this way, the inside of the cavity channel 7 can be cleaned or parts can be replaced without disassembling the housing 1, which is convenient for inspection and maintenance.

[0026] As a preferred embodiment, sealing rings 12 are provided on the connection surfaces of the conveying pipe 4 and the vacuum pumping pipe 10 with the housing 1. The sealing rings 12 are in an O shape. Further, the sealing rings 12 are made of silicone rubber material and have good resistance to compression set, ensuring effective sealing performance after long-term use. The circular shape of the sealing rings 12 enables them to evenly exert pressure outward when compressed, filling and closing the gaps.

[0027] As a preferred embodiment, a first spring 13 is provided on one side of the valve core 8, and the valve core 8 is connected to the cavity channel 7 through the first spring 13. After the hydraulic cylinder 3 is started, it can push the valve core 8 to displace along the cavity channel 7, so that the vacuum pump 6 is connected to the vacuum pumping pipe 10. Further, when the hydraulic oil pressure in the hydraulic cylinder 3 increases, the hydraulic cylinder 3 transmits the thrust to the valve core 8, overcoming the pressure of the first spring 13, causing the valve core 8 to move towards the inside of the cavity channel 7. The first spring 13 provides physical buffering, reduces mechanical shock caused by the rapid movement of the hydraulic cylinder 3, and extends the service life of the valve core 8 and related components. At the same time, the reset function of the first spring 13 also ensures that when the pressure of the hydraulic cylinder 3 disappears, the valve core 8 can quickly return to the initial position, close the channel, and provide additional safety protection.

[0028] As a preferred embodiment, the cone valve mechanism 9 includes a gland 14, an adjusting rod 15, a second spring 16, a cone valve 17, and a cone valve seat 18. An adjusting rod 15 is provided on one side of the gland 14, a second spring 16 is provided on one side of the adjusting rod 15, a cone valve 17 is provided on one side of the second spring 16, and a cone valve seat 18 is provided on one side of the cone valve 17. Further, the cone valve mechanism 9 can achieve extremely fine and precise fluid control through simple manual operation with these parts, making the system suitable for a variety of different production requirements and conditions, and improving the adaptability of the device to personalized needs.

[0029] As a preferred embodiment, the adjusting rod 15 can be made to perform circular motion through the gland 14, so that the cone valve 17 moves up and down along the vertical direction of the cone valve seat 18. Further, when the operator rotates the gland 14, the internal thread drives the adjusting rod 15 to perform circular motion. As the adjusting rod moves, the cone valve 17 approaches or moves away from the cone valve seat 18 under the action of the second spring 16, thereby reducing or increasing the opening size of the vacuum pumping pipe 10 passing through, and achieving precise control of the flow rate.

[0030] As a preferred embodiment, a handle 19 is provided on one side of the outer wall of the one-way valve 2. Further, the handle 19 is made of stainless steel material and is coated with an anti-slip coating. The operation of the handle 19 usually has a clear stop position, enabling the operator to clearly understand the state of the one-way valve 2, ensuring that each operation reaches the expected position, and facilitating the maintenance of the device by the staff.

[0031] The working process of the present utility model is as follows: First, start the hydraulic cylinder 3 to make the hydraulic cylinder 3 in a standby state. At the same time, check whether the vacuum pump 6 is ready and ensure that the vacuum suction pipe 10 is aligned with the device. After the docking is completed, the staff confirms that the oil plug 11 is sealed to avoid air leakage during the vacuum pumping process. Then, through the one-way valve 2, the valve core 8 in the vacuum valve 5 starts to displace, opening the vacuum channel to make the device start to pump vacuum. Once the required vacuum degree is reached, by appropriately adjusting the cone valve mechanism 9, the pumping speed of the vacuum pump 6 is stabilized to maintain a constant vacuum state inside the mold. When the vacuum pumping is completed, the device can quickly close the vacuum valve 5 by controlling the hydraulic cylinder 3 to maintain the stability inside the mold. The above is the working principle of the high-vacuum actively closed hydraulic vacuum valve for a die-casting machine mold.

Claims

1. A high vacuum active closing hydraulic vacuum valve for a die casting machine mold, comprising a housing (1), characterized in that: A one-way valve (2) is arranged on one side of the bottom of the shell (1), a hydraulic cylinder (3) is arranged on one side of the one-way valve (2), a delivery pipe (4) is arranged on the other side of the one-way valve (2), a vacuum valve (5) is arranged on one side of the delivery pipe (4), a vacuum pump (6) is arranged on one side of the vacuum valve (5), a mold cavity channel (7) is arranged inside the vacuum valve (5), a valve core (8) is arranged inside the mold cavity channel (7), a cone valve mechanism (9) is arranged on one side of the mold cavity channel (7), and a vacuum pumping pipe (10) is arranged on one side of the cone valve mechanism (9).

2. The high vacuum active closing hydraulic vacuum valve for die casting machine mold according to claim 1, characterized in that: An oil plug (11) is provided on one side of the mold cavity channel (7), and two groups of the oil plugs (11) are provided, and the two groups of the oil plugs (11) are evenly arranged along the vertical direction of the mold cavity channel (7).

3. The high vacuum active closing hydraulic vacuum valve for die casting machine mold according to claim 1, characterized in that: A sealing ring (12) is provided on the connection surfaces of the delivery pipe (4) and the vacuum pumping pipe (10) with the outer shell (1), and the sealing ring (12) is in an O-shape.

4. The high vacuum active closing hydraulic vacuum valve for die casting machine mold according to claim 1, characterized in that: A No. 1 spring (13) is provided on one side of the valve core (8), and the valve core (8) is connected to the mold cavity channel (7) via the No. 1 spring (13). After the hydraulic cylinder (3) is started, it can push the valve core (8) to move along the mold cavity channel (7), thereby connecting the vacuum pump (6) to the vacuum pumping pipe (10).

5. The high vacuum active closing hydraulic vacuum valve for die casting machine mold according to claim 1, characterized in that: The cone valve mechanism (9) comprises a rotary cover (14), an adjusting rod (15), a No. 2 spring (16), a cone valve (17) and a cone valve seat (18); the adjusting rod (15) is arranged on one side of the rotary cover (14); the No. 2 spring (16) is arranged on one side of the adjusting rod (15); the cone valve (17) is arranged on one side of the No. 2 spring (16); and the cone valve seat (18) is arranged on one side of the cone valve (17).

6. A high vacuum active closing hydraulic vacuum valve for die casting machine mold according to claim 5, characterized in that: The rotating cover (14) can cause the regulating rod (15) to perform circular motion, thereby causing the cone valve (17) to move up and down along the vertical direction of the cone valve seat (18).

7. The high vacuum active closing hydraulic vacuum valve for die casting machine mold according to claim 1, characterized in that: A handle (19) is provided on one side of the outer wall of the one-way valve (2).

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