Low-stress extrusion valve sleeve pinch valve

Abstract

The utility model relates to a pinch valve with a low-stress extrusion valve sleeve, and relates to the technical field of pinch valves, in order to solve the problem of fatigue damage of the valve sleeve caused by long-term frequent opening and closing of the pinch valve, the pinch valve comprises a shell, an upper transverse plate, a middle transverse plate and a lower transverse plate are arranged in the shell, and a sliding rod used for connection is arranged between the upper transverse plate and the lower transverse plate; the middle transverse plate is arranged between the upper transverse plate and the lower transverse plate, the middle transverse plate is connected to the sliding rod in a sliding mode, an area for opening and closing the valve sleeve is formed between the middle transverse plate and the lower transverse plate, a limiting sleeve is arranged on the upper surface of the lower transverse plate, and the sliding rod is sleeved with the limiting sleeve. The shell is provided with an executing mechanism used for driving the positions of the middle transverse plate and the lower transverse plate. The valve sleeve has the advantages that the possibility that the valve sleeve is subjected to overlarge extrusion stress is reduced, and the service life of the valve sleeve is effectively prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of pinch valves, and in particular to a low-stress extrusion valve sleeve pinch valve. Background Art

[0002] A pinch valve is a key component widely used in fluid control systems. It controls the on-off of fluid by clamping or releasing a hose or elastic sleeve (i.e., the valve sleeve) in a pipeline. As the core component of the pinch valve, the valve sleeve not only needs to have good sealing performance but also withstand the extrusion force from the actuator to ensure that the valve can effectively cut off the fluid in the closed state. In practical applications, the pinch valve has been widely used in many fields such as chemical industry, food, and medicine due to its simple structure, convenient operation, and low maintenance cost.

[0003] However, during the long-term and frequent opening and closing process of the pinch valve, the valve sleeve is constantly squeezed and relaxed. This repeated stress will cause fatigue damage to the valve sleeve. As the use time increases, the fatigue cracks will gradually expand, eventually leading to the failure of the valve sleeve and triggering safety hazards such as fluid leakage. Therefore, how to reduce the risk of fatigue damage to the valve sleeve during the long-term operation of the pinch valve has become an urgent technical problem to be solved. Summary of the Utility Model

[0004] In order to solve the problem of fatigue damage of the valve sleeve caused by the long-term and frequent opening and closing of the pinch valve, the present application provides a low-stress extrusion valve sleeve pinch valve.

[0005] The low-stress extrusion valve sleeve pinch valve provided by the present application adopts the following technical solutions:

[0006] A low-stress extrusion valve sleeve pinch valve includes a housing. An upper cross plate, a middle cross plate, and a lower cross plate are arranged in the housing. A slide rod for connection is arranged between the upper cross plate and the lower cross plate. The middle cross plate is arranged between the upper cross plate and the lower cross plate and is slidably connected to the slide rod. A region for opening and closing the valve sleeve is formed between the middle cross plate and the lower cross plate. A limiting sleeve is arranged on the upper surface of the lower cross plate, and the limiting sleeve is sleeved on the slide rod. An actuator for driving the positions of the middle cross plate and the lower cross plate is arranged on the housing.

[0007] Since during the long-term and frequent opening and closing process of the pinch valve, the valve sleeve is constantly squeezed and relaxed. This repeated stress will cause fatigue damage to the valve sleeve. As the use time increases, the fatigue cracks will gradually expand, eventually leading to the failure of the valve sleeve and triggering safety hazards such as fluid leakage. By adopting the above technical solutions, including a housing, the upper cross plate, the middle cross plate, and the lower cross plate are installed in the housing. The slide rod is used to connect the upper cross plate and the lower cross plate. The limiting sleeve is installed on the lower cross plate, and the actuator opens and closes the valve sleeve.

[0008] Before the valve sleeve is closed, the valve sleeve is in the open state, and the material can freely pass through the channel formed between the middle cross plate and the lower cross plate. When the valve sleeve needs to be closed, the actuator (such as a hydraulic cylinder, an electric push rod, etc.) starts to work, pushing the lower cross plate to slide upward and gradually approaching the middle cross plate. As the lower cross plate moves, it gradually compresses the valve sleeve located between the middle cross plate and the lower cross plate. The limit sleeve plays a key role in this process, restricting the maximum moving distance of the lower cross plate and preventing the valve sleeve from being clamped too tightly. This can not only ensure the effective closing of the valve sleeve but also prevent damage to the valve sleeve caused by excessive clamping force. When the distance between the middle cross plate and the lower cross plate is reduced to a predetermined value, the valve sleeve is completely compressed and closely attached to the lower cross plate, forming an effective seal. The valve sleeve is closed, the material is cut off, and can no longer pass through this channel. The pinch valve is in a stable closed state, waiting for the next opening instruction;

[0009] Through the settings of the actuator, limit sleeve, etc., the maximum downward moving distance of the middle cross plate is accurately restricted, thereby reducing the possibility of the valve sleeve being subjected to excessive extrusion stress, effectively extending the service life of the valve sleeve, reducing potential safety hazards such as fluid leakage caused by fatigue damage, and improving the overall stability and durability of the pinch valve.

[0010] Optionally, through holes for installing the sliding rods are respectively formed through the upper cross plate and the lower cross plate, and both ends of the sliding rod are inserted and fixed in the corresponding through holes.

[0011] By adopting the above technical solution, the through holes are formed through the upper cross plate and the lower cross plate; through the arrangement of the through holes, the sliding rod can be firmly inserted between the upper cross plate and the lower cross plate, forming a stable connection structure, which helps to reduce the loosening or deviation of the sliding rod during long-term use and ensure the overall stability of the pinch valve.

[0012] Optionally, the actuator includes an actuating screw rod, a connecting guide rod and a driving member. Both ends of the connecting guide rod are respectively connected inside the housing. The inside of the sliding rod is a hollow structure. The sliding rod is sleeved on the connecting guide rod and is slidably connected to the connecting guide rod. The actuating screw rod penetrates through the upper cross plate and is rotatably connected to the middle cross plate, and the actuating screw rod is threadedly connected to the upper cross plate. The driving member is connected to the end of the actuating screw rod, and the driving member is used to drive the actuating screw rod to rotate.

[0013] By adopting the above technical solution, the actuator includes an actuating lead screw, a connecting guide rod and a driving member; when it is necessary to close the valve sleeve, the driving member starts to work, the actuating lead screw starts to rotate under the drive of the driving member, and a threaded fit is formed between the actuating lead screw and the upper cross plate. The rotation of the actuating lead screw will be converted into the axial movement of the upper cross plate. However, since the middle cross plate is rotatably connected to the actuating lead screw, the middle cross plate remains in place. As the upper cross plate moves, the sliding rod slides on the guide rod and synchronously pushes the lower cross plate upward. When the lower cross plate moves to a predetermined position, it compresses the valve sleeve located between the middle cross plate and the lower cross plate, making it closely fit on the middle cross plate or forming an effective seal, and the material is cut off and cannot pass through the channel anymore, and the pinch valve is in a stable closed state; through the setting of the actuator, the rotation speed of the actuating lead screw is precisely controlled to achieve precise control of the moving distance of the lower cross plate, thereby ensuring the accuracy and stability of the valve sleeve during the closing process.

[0014] Optionally, the driving member includes a servo motor, the servo motor is arranged outside the housing, and the output end of the servo motor is connected to the end of the actuating lead screw.

[0015] By adopting the above technical solution, the driving member includes a servo motor, and the servo motor can achieve forward and reverse rotation; through the setting of the servo motor, the rotation direction of the actuating lead screw can be flexibly changed according to needs, allowing the valve sleeve to be closed or opened when needed, quickly responding and changing the rotation direction of the actuating lead screw to achieve rapid opening and closing of the valve sleeve.

[0016] Optionally, an assembly hole through which the actuating lead screw passes is formed through the top of the housing.

[0017] By adopting the above technical solution, the assembly hole is formed through the housing; through the setting of the assembly hole, it is ensured that the actuating lead screw can be accurately aligned and passed through, simplifying the installation process and facilitating subsequent debugging and maintenance work.

[0018] Optionally, the number of the sliding rods and the connecting guide rods is two each. One sliding rod corresponds to one connecting guide rod, and the two groups of sliding rods and connecting guide rods are respectively arranged on both sides of the length direction of the upper cross plate.

[0019] By adopting the above technical solution, the number of the sliding rods and the connecting guide rods is two groups; through the setting of the two groups of sliding rods and connecting guide rods, a double support is formed, greatly enhancing the stability of the pinch valve when closing the valve sleeve, ensuring the close fit and effective seal of the valve sleeve, and being able to adapt to different working environments and fluid media.

[0020] Optionally, the number of the limiting sleeves is two, the two limiting sleeves respectively correspond to the two sliding rods, and the thicknesses of the two limiting sleeves are the same.

[0021] By adopting the above technical solution, the number of the limiting sleeves is two; through the setting of the number of the limiting sleeves, the effective closing of the pinch valve and the function of cutting off the material are ensured, and the damage of the valve sleeve caused by excessive clamping is avoided, the stability and reliability of the pinch valve are improved, the adjustment and maintenance are facilitated, and the adaptability is strong.

[0022] Optionally, the thickness of any one of the limiting sleeves is greater than the thickness of a single valve sleeve, and the thickness of the limiting sleeve is less than twice the thickness of the valve sleeve.

[0023] By adopting the above technical solution, the thickness of the limiting sleeve is greater than the thickness of a single valve sleeve, and the thickness of the limiting sleeve is less than twice the thickness of the valve sleeve; through the setting of the thickness of the limiting sleeve, it helps to reduce the wear and fatigue of the valve sleeve during the closing process, not only can extend the service life of the valve sleeve, but also reduce the maintenance and replacement costs caused by the damage of the valve sleeve.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] Through the settings of the actuator, the limiting sleeve, etc., the maximum downward movement distance of the middle cross plate is accurately limited, thereby reducing the possibility that the valve sleeve is subjected to excessive extrusion stress, effectively extending the service life of the valve sleeve, reducing safety hazards such as fluid leakage caused by fatigue damage, and improving the overall stability and durability of the pinch valve;

[0026] Through the setting of the actuator, the rotation speed of the actuating lead screw is accurately controlled, the movement distance of the lower cross plate is accurately controlled, and further the accuracy and stability of the valve sleeve during the closing process are ensured;

[0027] By adopting the above technical solution, the number of the limiting sleeves is two; through the setting of the number of the limiting sleeves, the effective closing of the pinch valve and the function of cutting off the material are ensured, and the damage of the valve sleeve caused by excessive clamping is avoided, the stability and reliability of the pinch valve are improved, the adjustment and maintenance are facilitated, and the adaptability is strong. Description of the Drawings

[0028] Figure 1 It is a schematic structural diagram of a low-stress extrusion valve sleeve pinch valve in an embodiment of the present application.

[0029] Figure 2 It is a partial enlarged view for reflecting the limiting sleeve in an embodiment of the present application.

[0030] Description of the reference numerals: 1, housing; 2, upper cross plate; 3, middle cross plate; 4, lower cross plate; 5, slide bar; 6, limiting sleeve; 7, actuator; 71, actuating lead screw; 72, connecting guide rod; 73, driving member; 731, servo motor; 8, through hole; 9, assembly hole. Detailed Description of the Invention

[0031] The following is combined with the attachedFigure 1-2 Further detailed description is made to this application.

[0032] An embodiment of this application discloses a low-stress extrusion valve sleeve pinch valve. Refer to Figure 1 , the low-stress extrusion valve sleeve pinch valve includes a housing 1, an upper cross plate 2, a middle cross plate 3 and a lower cross plate 4 are installed in the housing 1, the middle cross plate 3 is arranged between the upper cross plate 2 and the lower cross plate 4, and a valve sleeve opening and closing area is formed between the middle cross plate 3 and the lower cross plate 4.

[0033] Refer to Figure 1 , a slide rod 5 is installed between the upper cross plate 2 and the lower cross plate 4. In this embodiment, through holes 8 are respectively formed through the upper cross plate 2 and the lower cross plate 4, and two ends of the slide rod 5 are respectively inserted and fixed in the through holes 8 of the upper cross plate 2 and the lower cross plate 4, forming a stable connection structure, which helps to reduce the looseness or deviation of the slide rod 5 during long-term use and ensure the overall stability of the pinch valve.

[0034] Refer to Figure 1 , meanwhile, the number of the slide rods 5 is two, the two slide rods 5 are respectively symmetrically installed on two sides of the upper cross plate 2 in the length direction, and the middle cross plate 3 is slidably connected to the two slide rods 5.

[0035] Refer to Figure 1 , an actuator 7 is installed on the housing 1, the actuator 7 includes an actuating lead screw 71, a connecting guide rod 72 and a driving member 73. In this embodiment, the number of the connecting guide rods 72 is two, the two connecting guide rods 72 are both installed and fixed in the housing 1, and the arrangement direction of the connecting guide rod 72 is the same as that of the slide rod 5. The inside of the slide rod 5 is a hollow structure, the two slide rods 5 respectively correspond to the two connecting guide rods 72, the slide rod 5 is sleeved on the corresponding connecting guide rod 72, and the slide rod 5 slides along the length direction of the connecting guide rod 72.

[0036] Refer to Figure 1 , the driving member 73 is installed outside the housing 1, the driving member 73 includes a servo motor 731. In this embodiment, the servo motor 731 can achieve forward and reverse rotation, one end of the actuating lead screw 71 is connected to the output end of the servo motor 731, and meanwhile, an assembly hole 9 for the actuating lead screw 71 to pass through is formed through the top of the housing 1; the servo motor 731 can flexibly change the rotation direction of the actuating lead screw 71 according to needs, and quickly respond and change the rotation direction of the actuating lead screw 71.

[0037] Refer to Figure 1, one end of the actuating lead screw 71 away from the servo motor 731 penetrates the upper cross plate 2 and is rotatably mounted on the middle cross plate 3 through a bearing. In this embodiment, the actuating lead screw 71 is threadedly connected to the upper cross plate 2; when the servo motor 731 is started, the actuating lead screw 71 starts to rotate under the drive of the servo motor 731. A threaded fit is formed between the actuating lead screw 71 and the upper cross plate 2. The rotation of the actuating lead screw 71 will be converted into the axial movement of the upper cross plate 2. However, since the middle cross plate 3 is rotatably connected to the actuating lead screw 71, the middle cross plate 3 remains in place. As the upper cross plate 2 moves, the slide rod 5 slides on the connecting guide rod 72, synchronously pushing the lower cross plate 4 upward. The lower cross plate 4 and the middle cross plate 3 compress the valve sleeve to form an effective seal.

[0038] Referring to Figure 1 and Figure 2 , a limit sleeve 6 is mounted on the upper surface of the lower cross plate 4. In this embodiment, the limit sleeve 6 is made of an elastic material, and the elastic material can be rubber. The number of limit sleeves 6 is two, and the thicknesses of the two limit sleeves 6 are the same. The two limit sleeves 6 respectively correspond to the two slide rods 5, and the limit sleeve 6 is sleeved on the corresponding slide rod 5.

[0039] Referring to Figure 2 , at the same time, the thickness of any one limit sleeve 6 is greater than the thickness of a single valve sleeve, and the thickness of the limit sleeve 6 is less than twice the thickness of the valve sleeve. This not only ensures the effective closing of the pinch valve and the function of cutting off the material, but also avoids damage to the valve sleeve caused by excessive clamping, improves the stability and reliability of the pinch valve, is convenient for adjustment and maintenance, and has strong adaptability.

[0040] The implementation principle of a low-stress extrusion valve sleeve pinch valve in an embodiment of this application is as follows: Before the valve sleeve is closed, the valve sleeve is in an open state, and the material can freely pass through the channel formed between the middle cross plate 3 and the lower cross plate 4. When the valve sleeve needs to be closed, the servo motor 731 is started, and the actuating lead screw 71 starts to rotate under the drive of the servo motor 731. A threaded fit is formed between the actuating lead screw 71 and the upper cross plate 2. The rotation of the actuating lead screw 71 will be converted into the axial movement of the upper cross plate 2. However, since the middle cross plate 3 is rotatably connected to the actuating lead screw 71, the middle cross plate 3 remains in place. As the upper cross plate 2 moves, the slide rod 5 slides on the guide rod, synchronously pushing the lower cross plate 4 upward. The limit sleeve 6 plays a key role in this process, restricting the maximum downward movement distance of the middle cross plate 3 and preventing the valve sleeve from being clamped too tightly. It can not only ensure the effective closing of the valve sleeve, but also prevent damage to the valve sleeve caused by excessive clamping force. The distance between the middle cross plate 3 and the lower cross plate 4 is reduced to a predetermined value, the valve sleeve is completely compressed and closely attached to the lower cross plate 4 to form an effective seal, the valve sleeve is closed, the material is cut off and can no longer pass through this channel, and the pinch valve is in a stable closed state, waiting for the next opening instruction;

[0041] Through the settings of the actuator 7, the limit sleeve 6, etc., the maximum downward movement distance of the middle cross plate 3 is accurately limited, thereby reducing the possibility of the valve sleeve being subjected to excessive extrusion stress, effectively extending the service life of the valve sleeve, reducing potential safety hazards such as fluid leakage caused by fatigue damage, and improving the overall stability and durability of the pinch valve.

[0042] The above are all preferred embodiments of the present application. The protection scope of the present application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A low-stress extrusion valve sleeve pinch valve, characterized in that: It includes a housing (1), in which an upper cross plate (2), a middle cross plate (3) and a lower cross plate (4) are arranged. A sliding rod (5) for connection is arranged between the upper cross plate (2) and the lower cross plate (4). The middle cross plate (3) is arranged between the upper cross plate (2) and the lower cross plate (4), and the middle cross plate (3) is slidably connected to the sliding rod (5). A valve sleeve opening and closing area is formed between the middle cross plate (3) and the lower cross plate (4). A limiting sleeve (6) is arranged on the upper surface of the lower cross plate (4), and the limiting sleeve (6) is sleeved on the sliding rod (5). An actuator (7) for driving the positions of the middle cross plate (3) and the lower cross plate (4) is arranged on the housing (1).

2. The low-stress extrusion valve sleeve pinch valve according to claim 1, wherein: Through holes (8) for installing the sliding rod (5) are respectively formed through the upper cross plate (2) and the lower cross plate (4), and both ends of the sliding rod (5) are inserted and fixed in the corresponding through holes (8).

3. The low-stress extrusion valve sleeve pinch valve according to claim 2, characterized in that: The actuator (7) includes an actuating screw rod (71), a connecting guide rod (72) and a driving member (73). Both ends of the connecting guide rod (72) are respectively connected inside the housing (1). The inside of the sliding rod (5) is a hollow structure. The sliding rod (5) is sleeved on the connecting guide rod (72), and the sliding rod (5) is slidably connected to the connecting guide rod (72). The actuating screw rod (71) penetrates through the upper cross plate (2) and is rotatably connected to the middle cross plate (3), and the actuating screw rod (71) is threadedly connected to the upper cross plate (2). The driving member (73) is connected to the end of the actuating screw rod (71), and the driving member (73) is used to drive the actuating screw rod (71) to rotate.

4. The low-stress extrusion valve sleeve pinch valve according to claim 3, characterized in that: The driving member (73) includes a servo motor (731). The servo motor (731) is arranged outside the housing (1), and the output end of the servo motor (731) is connected to the end of the actuating screw rod (71).

5. The low-stress extrusion valve sleeve pinch valve according to claim 3, wherein: An assembly hole (9) through which the actuating screw rod (71) passes is formed through the top of the housing (1).

6. The low-stress extrusion valve sleeve pinch valve according to claim 3, wherein: The number of both the sliding rod (5) and the connecting guide rod (72) is two. One sliding rod (5) corresponds to one connecting guide rod (72), and the two groups of the sliding rod (5) and the connecting guide rod (72) are respectively arranged on both sides of the length direction of the upper cross plate (2).

7. A low-stress extrusion valve sleeve pinch valve according to claim 6, characterized in that: The number of the limiting sleeves (6) is two. The two limiting sleeves (6) respectively correspond to the two sliding rods (5), and the thicknesses of the two limiting sleeves (6) are the same.

8. A low-stress extrusion valve sleeve pinch valve according to claim 7, characterized in that: The thickness of any one of the limiting sleeves (6) is greater than the thickness of a single valve sleeve, and the thickness of the limiting sleeve (6) is less than twice the thickness of the valve sleeve.

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