Vacuum environment dual-drive pipe clamp valve
By designing a dual-drive clamp valve in a vacuum environment, pressure balance and sealing improvement of the elastic core are achieved, solving the problems of short service life and insufficient accuracy of clamp valves in a vacuum environment, and meeting the needs of filling high-viscosity and high-sensitivity explosives.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-30
- Publication Date
- 2026-04-14
AI Technical Summary
Existing clamp valves cannot open properly in a vacuum environment, resulting in short service life, high cost, and insufficient delivery accuracy, making them unsuitable for the needs of high-viscosity, high-sensitivity explosive filling production lines.
The valve employs a vacuum environment dual-drive clamp valve, which balances the pressure on the inner and outer walls of the elastic core by vacuuming inside the valve body. Combined with a dual-push mechanism and guide rod, it ensures reliable opening and sealing of the elastic core. Furthermore, the arc-surface contact and limiting mechanism improve service life and accuracy.
It extends the service life of the elastic core, reduces the cost of use, improves the delivery accuracy, and meets the needs of high-viscosity and high-sensitivity explosives filling in a vacuum environment.
Smart Images
Figure CN224120700U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of high-viscosity, high-sensitivity explosive filling production line, and in particular to a vacuum environment dual-drive clamp valve. Background Technology
[0002] Pinch valves are widely used in mining, medical, bioprocessing, biotechnology, pharmaceutical, chemical, food and beverage industries due to their excellent corrosion resistance, wear resistance and non-contact sealing characteristics. Their core is usually a flexible tube made of rubber, polyurethane or other polymer elastic materials. The working principle is that the clamping mechanism squeezes the tube through pneumatic, electric or hydraulic drive, thereby realizing the opening or closing of the fluid or the regulation of the flow.
[0003] Existing pinch valves are primarily used in environments where fluid pipelines are under positive pressure. Even after the valve hose undergoes plastic deformation, the internal positive pressure still allows for smooth flow control of the medium, including opening, closing, or regulation of the flow rate. However, in high-viscosity, high-sensitivity explosive filling production lines, the conveying channel is a vacuum environment. When the outlet becomes a vacuum, due to the deformable nature of the elastic core, the large pressure difference between the internal vacuum and external atmospheric pressure prevents the elastic core from opening, thus rendering the valve unusable.
[0004] Opening a pinch valve in a vacuum environment requires a more powerful and costly power mechanism, significantly increasing space requirements and manufacturing costs. While adding a tension strap to the elastic core could be an option, the excessive tension can cause localized stress on the core, resulting in a very short lifespan, typically failing within days. Furthermore, the elastic cores required for high-viscosity, high-sensitivity explosive filling production lines are usually very expensive, costing 80,000-100,000 RMB and needing to be imported. Given the current complex international situation and the instability of imported parts procurement, frequent replacements of valve cores would significantly increase operating costs and parts procurement risks. Additionally, the vacuum creates a reverse force during the opening process of the elastic core, leading to a mismatch between the controlled opening degree and the actual opening degree, resulting in insufficient delivery accuracy. The filling process for high-sensitivity explosives requires protection from collisions, contamination, and static electricity; therefore, developing a pinch valve suitable for this operating environment is a pressing issue. Utility Model Content
[0005] The technical problem to be solved by this utility model is to provide a dual-drive clamp valve for vacuum environments, which can improve the service life of the elastic core of the clamp valve in vacuum environments, reduce the cost of using the clamp valve, and improve the accuracy of the clamp valve's delivery volume, so as to adapt to the filling of high-viscosity and high-sensitivity explosives in vacuum environments.
[0006] To solve the above-mentioned technical problems, the vacuum environment dual-drive clamp valve provided by this utility model adopts the following technical solution:
[0007] A vacuum environment dual-drive clamp valve includes a valve body, an elastic core disposed inside the valve body, and a first pushing mechanism and a second pushing mechanism respectively disposed on both sides of the valve body. The elastic core passes through the valve body, and both ends of the elastic core are fixedly connected to the valve body. The movable rods of the first pushing mechanism and the second pushing mechanism are both inserted through and slidably connected to the outer wall of the valve body. The movable rods of the first pushing mechanism and the second pushing mechanism can move toward the elastic core and squeeze the elastic core. The valve body is provided with a vacuum suction port.
[0008] By adopting the above technical solution, the material inlet is at atmospheric pressure, and the material outlet container is in a vacuum environment with a maximum vacuum pressure of -0.095 MPa. The valve body is internally sealed, and a sealed space is formed between the elastic core and the valve body. When the material outlet is in a vacuum environment, the inside of the valve body is vacuumed to achieve the same vacuum pressure as the material outlet container, thus ensuring that the pressure on the inner and outer walls of the elastic core is the same. This achieves the same operating environment as a conventional pinch valve, allowing the elastic core to be easily opened without exerting significant tension on its walls, greatly improving its service life. Actual use has verified that the service life can be increased to approximately three months. The movable rods of the first and second pushing mechanisms can move towards and compress the elastic core, thereby achieving fluid flow control, such as opening / closing or flow regulation. The elastic core creates a uniform pressure environment inside and outside, significantly saving energy consumption during use. It eliminates the need for more expensive first and second actuation mechanisms, reducing valve costs. Furthermore, the uniform pressure environment prevents the tube wall from experiencing reverse forces during opening, ensuring the controlled opening degree matches the actual opening degree and improving the accuracy of explosive delivery. This application extends the service life of the pinch valve core in vacuum environments, reduces the cost of pinch valves, and enhances the accuracy of pinch valve delivery, enabling the filling of high-viscosity, high-sensitivity explosives in vacuum environments.
[0009] Optionally, both the first and second pushing mechanisms have a pressure rod at the end of their movable rods. The pressure rod is perpendicular to the axis of the movable rods of the first and second pushing mechanisms, as well as the axis of the elastic core. The length of the pressure rod is greater than the diameter of the elastic core.
[0010] By adopting the above technical solution, the elastic core can be more fully compressed and completely closed by using two pressure rods perpendicular to the axis of the first pushing mechanism and the elastic core.
[0011] Optionally, the contact surfaces of both pressure bars and the elastic core are arc surfaces.
[0012] By adopting the above technical solution, the contact surfaces of the two pressure rods and the elastic core are all arc surfaces, and they are in line contact with the elastic core. This reduces the tensile deformation of the tube wall during compression, enhances the sealing of the valve closure, and further improves the service life of the elastic core.
[0013] Optionally, the outer wall of the elastic tube core is fixed with two lugs, and the two lugs are respectively fixed to two pressure rods.
[0014] By adopting the above technical solution, the left and right pull tabs of the elastic tube core are fixed on the left and right pressure bars respectively, and move together with the pressure bars. When the two pressure bars move away from the elastic tube core, they can drive the two pull tabs away from each other, which can prevent the two side walls of the elastic tube core from failing to open on their own, thus ensuring that the elastic tube core opens and realizing the flow or regulation of fluid.
[0015] Optionally, both the first and second pushing mechanisms are provided with an opening adjustment mechanism, which is used to limit the distance between the pressure rod and the elastic core.
[0016] By adopting the above technical solution, the distance between the pressure rod and the elastic core is limited by the opening adjustment mechanism, so as to accurately control the opening of the elastic core, thereby avoiding the situation where the opening of the elastic core is not accurately controlled by the first pushing mechanism and the second pushing mechanism alone.
[0017] Optionally, the valve body is fixedly mounted with at least one guide rod, and at least one guide rod is parallel to the movable rod of the first push mechanism and the second push mechanism. The movable rods of the first push mechanism and the second push mechanism are simultaneously sleeved and slidably connected to at least one guide rod.
[0018] By adopting the above technical solution, the guide rod slides and guides the two pressure rods to ensure that the two pressure rods can fully compress the elastic core and make it completely closed.
[0019] Optionally, the driving force or movement speed of the first pushing mechanism is greater than that of the second pushing mechanism. The first pushing mechanism is provided with a limiting mechanism, which is used to limit the stroke of the movable rod of the first pushing mechanism. When the movable rod of the first pushing mechanism reaches its maximum stroke, the pressure rod is located at the central axis of the elastic core.
[0020] By adopting the above technical solution, the first and second pushing mechanisms are activated simultaneously. Since the driving force or speed of the first pushing mechanism is greater than that of the second, the pressure rod of the first pushing mechanism moves first, reaching the central axis of the elastic core before ceasing movement. The pressure rod of the second pushing mechanism then compresses the wall of the elastic core to its central axis. This process allows the elastic core to be simultaneously compressed (or stretched) on both sides, resulting in essentially the same deformation and improving its service life.
[0021] Optionally, a sealing seat is provided at the point where the movable rods of the first and second pushing mechanisms pass through the valve housing. The sealing seat is fixedly installed on the outer wall of the valve housing, and a sealing ring is embedded in the inner circular surface of the sealing seat. The movable rods of the first and second pushing mechanisms pass through the two sealing seats respectively, and the sealing ring abuts against the movable rod.
[0022] By adopting the above technical solution, and through the setting of the sealing seat and sealing ring, it is possible to ensure the sealing of the valve housing while the moving rods of the first and second pushing mechanisms slide relative to the valve housing, thereby ensuring that the valve housing reaches a sufficient vacuum degree after vacuum suction.
[0023] Optionally, the inner circular surface of the sealing seat is also fitted with an oilless bearing, and the movable rod of the first or second pushing mechanism passes through the oilless bearing, with the movable rod of the first or second pushing mechanism in contact with the oilless bearing.
[0024] By adopting the above technical solution, the oilless bearing can lubricate the sliding of the moving rod of the first or second pushing mechanism relative to the sealing seat, thereby reducing frictional loss.
[0025] Optionally, the sealing seat includes a sealing body and a cover plate. The sealing body is fixedly installed on the valve body. The cross-sectional profile of the inner wall of the sealing body is stepped. The large end of the inner wall of the sealing body is located away from the elastic tube core. The oilless bearing is placed inside the large end of the inner wall of the sealing body. The cover plate is detachably connected to the sealing body and abuts against the oilless bearing.
[0026] By adopting the above technical solution and using the detachable connection between the sealing body and the cover plate, the convenience and cost of inspecting and replacing oilless bearings can be improved.
[0027] In summary, this utility model has at least one of the following beneficial technical effects:
[0028] 1. By vacuuming the inside of the valve body to achieve the same vacuum pressure as the material outlet container, the pressure on the inner and outer walls of the elastic core is made the same, thus achieving the same operating environment as ordinary clamp valves. This allows the elastic core to be easily opened without exerting a large pulling force on the pipe wall, greatly improving its service life. The same pressure environment inside and outside the elastic core greatly saves energy consumption during use, significantly reducing the cost of the first and second actuation mechanisms, thereby lowering the cost of the valve and enabling it to be used for filling high-sensitivity explosives in a vacuum environment.
[0029] 2. The contact surfaces of both pressure rods and the elastic core are arc surfaces, and they are in line contact with the elastic core, which reduces the tensile deformation of the tube wall during compression, enhances the sealing of the valve closure, and further improves the service life of the elastic core;
[0030] 3. Simultaneously activate the first and second pushing mechanisms. Since the driving force or movement speed of the first pushing mechanism is greater than that of the second pushing mechanism, ensure that the pressure rod of the first pushing mechanism moves first. The pressure rod of the first pushing mechanism reaches the central axis of the elastic core and then stops moving. The pressure rod of the second pushing mechanism then squeezes the wall of the elastic core to its central axis. The above process can achieve simultaneous compression (tension) on both sides of the elastic core, with basically the same deformation, thus improving the service life of the elastic core. Attached Figure Description
[0031] Figure 1 This is a schematic diagram of the structure of a dual-drive clamp valve for vacuum environments, which is a product of this invention.
[0032] Figure 2 This is a top view of the present invention used to demonstrate a dual-drive clamp valve for vacuum environments.
[0033] Figure 3 yes Figure 1 A magnified structural diagram of part A in the middle.
[0034] Explanation of reference numerals in the attached drawings: 1. Valve body; 11. Guide rod; 12. Mounting rod; 2. Elastic core; 21. Pull lug; 3. First pushing mechanism; 4. Second pushing mechanism; 5. Vacuum suction port; 6. Pressure rod; 7. Opening adjustment mechanism; 71. Limit seat; 8. Limiting mechanism; 9. Sealing seat; 91. Sealing body; 92. Cover plate; 93. Oil-free bearing; 94. Sealing ring. Detailed Implementation
[0035] The following is in conjunction with the appendix Figure 1-3 The present invention will be described in further detail below.
[0036] This utility model discloses a dual-drive clamp valve for vacuum environments. (Refer to...) Figure 1 and Figure 2 The vacuum environment dual-drive clamp valve includes a valve body 1, an elastic core 2, a first actuating mechanism 3, and a second actuating mechanism 4. The valve body 1 is internally sealed and has a vacuum suction port 5. The elastic core 2 passes through the valve body 1, and both ends of the elastic core 2 are fixedly connected to the opening edge of the valve body 1. The space between the elastic core 2 and the valve body 1 is sealed.
[0037] Reference Figure 1 and Figure 2 The first pushing mechanism 3 and the second pushing mechanism 4 are located on opposite sides of the valve housing 1. Both the first pushing mechanism 3 and the second pushing mechanism 4 are cylinders. The cylinder bodies of the first pushing mechanism 3 and the second pushing mechanism 4 are fixedly installed on the valve housing 1 by the mounting rod 12. The movable rods of the first pushing mechanism 3 and the second pushing mechanism 4 are arranged opposite to each other and both pass through the outer wall of the valve housing 1. The moving paths of the movable rods of the first pushing mechanism 3 and the second pushing mechanism 4 are both perpendicular to the axis of the elastic core 2. The movable rods of the first pushing mechanism 3 and the second pushing mechanism 4 can move toward the elastic core 2 and squeeze the elastic core 2.
[0038] Reference Figure 1 and Figure 2 Each of the movable rods of the first pushing mechanism 3 and the second pushing mechanism 4 is provided with a pressure rod 6 at its end. The pressure rod 6 is perpendicular to the movable rods of the first pushing mechanism 3 and the second pushing mechanism 4, as well as the axis of the elastic core 2. The length of the pressure rod 6 is greater than the diameter of the elastic core 2, and the contact surfaces of the two pressure rods 6 and the elastic core 2 are both arc surfaces. Two guide rods 11 are fixedly installed on the valve body 1. The two guide rods 11 are parallel to the movable rods of the first pushing mechanism 3 and the second pushing mechanism 4. The movable rods of the first pushing mechanism 3 and the second pushing mechanism 4 are simultaneously sleeved and slidably connected to the two guide rods 11.
[0039] The movable rods of the first pushing mechanism 3 and the second pushing mechanism 4 can move toward the elastic core 2 and squeeze the elastic core 2, thereby realizing the opening, closing or flow regulation of the fluid; then the guide rod 11 slides and guides the two pressure rods 6 to ensure that the two pressure rods 6 can fully squeeze the elastic core 2 and make it completely closed.
[0040] The material inlet is at atmospheric pressure, while the material outlet container is in a vacuum environment with a maximum vacuum pressure of -0.095 MPa. The valve body 1 is internally sealed, and a sealed space is formed between the elastic core 2 and the valve body 1. When the material outlet is in a vacuum environment, vacuum suction is applied to the inside of the valve body 1 to achieve the same vacuum pressure as the material outlet container. This ensures that the pressure on the inner and outer walls of the elastic core 2 is the same, achieving the same operating environment as a conventional pinch valve. This allows the elastic core 2 to open easily without exerting significant tension on the pipe wall, greatly extending its service life. The identical pressure environment inside and outside the elastic core 2 significantly reduces energy consumption during use, and the costs of the first and second actuating mechanisms 3 and 4 are substantially reduced, lowering the overall valve cost. This application can improve the service life of the pinch valve core in a vacuum environment, reduce the operating cost of the pinch valve, and improve the accuracy of the pinch valve's delivery rate, making it suitable for the filling of highly sensitive explosives in a vacuum environment.
[0041] Furthermore, the two pressure rods 6, perpendicular to the axes of the first pushing mechanism 3 and the elastic core 2, can more fully compress the elastic core 2, enabling it to close completely. The contact surfaces of the two pressure rods 6 and the elastic core 2 are both arc-shaped, making line contact with the elastic core 2. This reduces the tensile deformation of the tube wall during compression, enhances the sealing of the valve closure, and further improves the service life of the elastic core 2.
[0042] Reference Figure 1 To prevent the side walls of the elastic core 2 from failing to open automatically, two lugs 21 are fixed to the outer wall of the elastic core 2, and the two lugs 21 are respectively fixed to the two pressure rods 6. The left and right lugs 21 of the elastic core 2 are fixed to the left and right pressure rods, respectively, and move together with the pressure rods. When the two pressure rods 6 move away from the elastic core 2, they can drive the two lugs 21 away from each other, which can prevent the side walls of the elastic core 2 from failing to open automatically, thus ensuring that the elastic core 2 opens and realizing the flow or regulation of fluid.
[0043] Reference Figure 1 and Figure 3 Both the first pushing mechanism 3 and the second pushing mechanism 4 are provided with an opening adjustment mechanism 7. The opening adjustment mechanism 7 has a plate-like structure and is fixedly connected to the mounting rod 12. The movable rod of the first pushing mechanism 3 passes through and slides to be connected to the opening adjustment mechanism 7. The movable rod of the first pushing mechanism 3 is fixedly connected to a limit seat 71. The limit seat 71 is provided with a stop structure. The projection of the opening adjustment mechanism 7 along the axis of the movable rod is located within the stop structure.
[0044] When the movable rods of the first pushing mechanism 3 and the second pushing mechanism 4 retract, the limiting seat 71 moves away from the valve body 1 along with the movable rods until the opening adjustment mechanism 7 is located within the stop structure, at which point the movable rod can no longer retract. In this way, the opening adjustment mechanism 7 limits the distance between the pressure rod 6 and the elastic core 2, so as to accurately control the opening of the elastic core 2. This avoids the situation where the opening of the elastic core 2 is not accurately controlled by the first pushing mechanism 3 and the second pushing mechanism 4 alone. At the same time, it can also prevent the two pressure rods 6 from causing the two pull lugs 21 to move too far apart, which would result in excessive flow or damage to the pipe wall due to excessive opening of the elastic core 2.
[0045] Reference Figure 1 and Figure 3 To further extend the service life of the elastic core 2, the driving force of the first pushing mechanism 3 is greater than that of the second pushing mechanism 4. The first pushing mechanism 3 is equipped with a limiting mechanism 8, which is fixedly connected to the end of the limiting seat 71 near the valve body 1. The limiting mechanism 8 is used to limit the stroke of the moving rod of the first pushing mechanism 3. When the moving rod of the first pushing mechanism 3 reaches its maximum stroke, the pressure rod 6 is located at the central axis of the elastic core 2. When the first pushing mechanism 3 and the second pushing mechanism 4 are activated simultaneously, since the driving force or movement speed of the first pushing mechanism 3 is greater than that of the second pushing mechanism 4, the pressure rod 6 of the first pushing mechanism 3 moves first. The pressure rod 6 of the first pushing mechanism 3 reaches the central axis of the elastic core 2 and then stops moving. The pressure rod 6 of the second pushing mechanism 4 then compresses the wall of the elastic core 2 to its central axis. The above process enables the elastic core 2 to be compressed (tensioned) on both sides simultaneously, with basically the same deformation, thus improving the service life of the elastic core 2.
[0046] Reference Figure 1 and Figure 3 To ensure the sealing of the valve housing 1 while allowing the movable rods of the first and second pushing mechanisms 3 and 4 to slide relative to the valve housing 1, sealing seats 9 are provided at the points where the movable rods of the first and second pushing mechanisms 3 and 4 pass through the valve housing 1. Each sealing seat 9 includes a sealing body 91 and a cover plate 92. The sealing body 91 is fixedly installed on the outer wall of the valve housing 1, and the movable rod of the first or second pushing mechanism 4 passes through the sealing body 91. The cross-sectional profile of the inner wall of the sealing body 91 is stepped. The larger end of the inner wall of the sealing body 91 is positioned away from the elastic core 2, and the oilless bearing 93 is placed inside the larger end of the inner wall of the sealing body 91. The cover plate 92 is detachably connected to the sealing body 91 and abuts against the oilless bearing 93. Sealing rings 94 are embedded in both the smaller end of the sealing body 91 and the cover plate 92.
[0047] By using the sealing seat 9 and the sealing ring 94, the sliding rods of the first pushing mechanism 3 and the second pushing mechanism 4 can be made to slide relative to the valve housing 1 while ensuring the sealing of the inside of the valve housing 1, thus achieving a sufficient vacuum level inside the valve housing 1 after vacuum suction. The oilless bearing 93 can lubricate the sliding of the sliding rods of the first pushing mechanism 3 or the second pushing mechanism 4 relative to the sealing seat 9, reducing frictional losses. The detachable connection between the sealing body 91 and the cover plate 92 can improve the convenience and cost of inspecting and replacing the oilless bearing 93.
[0048] The implementation principle of a vacuum environment dual-drive clamp valve according to this utility model embodiment is as follows: the movable rods of the first pushing mechanism 3 and the second pushing mechanism 4 can move toward the elastic core 2 and squeeze the elastic core 2, thereby realizing the flow, disconnection or flow regulation of fluid; then the guide rod 11 slides and guides the two pressure rods 6 to ensure that the two pressure rods 6 can fully squeeze the elastic core 2 and make it completely closed.
[0049] The material inlet is at atmospheric pressure, while the material outlet container is in a vacuum environment with a maximum vacuum pressure of -0.095 MPa. By vacuuming the inside of the valve body 1, the same vacuum pressure as the material outlet container is achieved, thus ensuring that the inner and outer walls of the elastic core 2 experience the same pressure. This further achieves the same operating environment as a conventional pinch valve, allowing the elastic core 2 to open easily without exerting significant tension on the pipe wall, greatly extending its service life. The identical pressure environment inside and outside the elastic core 2 significantly reduces energy consumption during use, and the costs of the first and second actuating mechanisms 3 and 4 are substantially reduced, lowering the overall valve cost. This application can improve the service life of the elastic core 2 in a vacuum environment, reduce the operating cost of pinch valves, and improve the accuracy of pinch valve delivery, enabling it to handle the filling of highly sensitive explosives in a vacuum environment.
[0050] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.
Claims
1. A vacuum environment dual-drive pinch valve, characterized in that: The valve housing includes a valve body (1), an elastic core (2) disposed inside the valve body (1), and a first pushing mechanism (3) and a second pushing mechanism (4) respectively disposed on both sides of the valve body (1). The elastic core (2) passes through the valve body (1) and both ends of the elastic core (2) are fixedly connected to the valve body (1). The movable rods of the first pushing mechanism (3) and the second pushing mechanism (4) are both inserted through and slidably connected to the outer wall of the valve body (1). The movable rods of the first pushing mechanism (3) and the second pushing mechanism (4) can move toward the elastic core (2) and squeeze the elastic core (2). The valve body (1) is provided with a vacuum suction port (5).
2. The vacuum environment dual-drive clamp valve according to claim 1, characterized in that: The first pushing mechanism (3) and the second pushing mechanism (4) are each provided with a pressure rod (6) at the end of their movable rods. The pressure rod (6) is perpendicular to the movable rods of the first pushing mechanism (3) and the second pushing mechanism (4) as well as the axis of the elastic core (2). The length of the pressure rod (6) is greater than the diameter of the elastic core (2).
3. The vacuum environment dual-drive clamp valve according to claim 2, characterized in that: The contact surfaces of the two pressure rods (6) and the elastic core (2) are both arc surfaces.
4. The vacuum environment dual-drive pinch valve according to claim 2, characterized in that: The outer wall of the elastic tube core (2) is fixed with two lugs (21), and the two lugs (21) are respectively fixed to two pressure rods (6).
5. The vacuum environment dual-drive clamp valve according to claim 1, characterized in that: Both the first pushing mechanism (3) and the second pushing mechanism (4) are provided with an opening adjustment mechanism (7), which is used to limit the distance between the pressure rod (6) and the elastic tube core (2).
6. The vacuum environment dual-drive pinch valve according to claim 2, characterized in that: The valve housing (1) is fixedly mounted with at least one guide rod (11). At least one guide rod (11) is parallel to the movable rod of the first push mechanism (3) and the second push mechanism (4). The movable rods of the first push mechanism (3) and the second push mechanism (4) are simultaneously sleeved and slidably connected to at least one guide rod (11).
7. The vacuum environment dual-drive clamp valve according to claim 2, characterized in that: The driving force or movement speed of the first pushing mechanism (3) is greater than that of the second pushing mechanism (4). The first pushing mechanism (3) is provided with a limiting mechanism (8). The limiting mechanism (8) is used to limit the stroke of the moving rod of the first pushing mechanism (3). When the moving rod of the first pushing mechanism (3) reaches its maximum stroke, the pressure rod (6) is located at the central axis of the elastic core (2).
8. The vacuum environment dual-drive pinch valve according to claim 1, characterized in that: Sealing seats (9) are provided at the points where the moving rods of the first pushing mechanism (3) and the second pushing mechanism (4) pass through the valve housing (1). The sealing seats (9) are fixedly installed on the outer wall of the valve housing (1). A sealing ring (94) is embedded in the inner circular surface of the sealing seat (9). The moving rods of the first pushing mechanism (3) and the second pushing mechanism (4) pass through the two sealing seats (9) respectively, and the sealing ring (94) abuts against the moving rod.
9. The vacuum environment dual-drive clamp valve according to claim 8, characterized in that: The inner circular surface of the sealing seat (9) is also fitted with an oilless bearing (93), and the movable rod of the first pushing mechanism (3) or the second pushing mechanism (4) passes through the oilless bearing (93), and the movable rod of the first pushing mechanism (3) or the second pushing mechanism (4) is in contact with the oilless bearing (93).
10. The vacuum environment dual-drive pinch valve according to claim 9, characterized in that: The sealing seat (9) includes a sealing body (91) and a cover plate (92). The sealing body (91) is fixedly installed on the valve body (1). The cross-sectional profile of the inner wall of the sealing body (91) is stepped. The large end of the inner wall of the sealing body (91) is located away from the elastic core (2). The oilless bearing (93) is placed inside the large end of the inner wall of the sealing body (91). The cover plate (92) is detachably connected to the sealing body (91) and abuts against the oilless bearing (93).