A pneumatic actuator limit device

Abstract

The utility model discloses a pneumatic actuator limit device, which relates to the technical field of pneumatic actuators, including two sets of covers, the opposite surfaces of the two covers are fixedly installed with actuator components, the top of the actuator component is movably installed with a limit component, the front of the actuator component is fixedly installed with a pneumatic actuator, the bottom of the pneumatic actuator is fixedly plugged with an air pipe, and the front of the bottom of the pneumatic actuator is movably installed with a valve. The utility model provides gas through the air pipe and the pneumatic actuator injects it into the actuator component. The gas fills the actuator component to form high pressure, thereby achieving a pneumatic effect, and can achieve two-way pneumatic in the process of pneumatic, thereby achieving a more efficient travel distance, and when the actuator is pneumatic, the limit component will limit the rotation process to avoid malfunctions caused by excessive pneumatic travel distance, so that the rotation angle strictly follows the standard of 180°.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic actuators, in particular to a pneumatic actuator limiting device. Background Art

[0002] Pneumatic actuators are actuators that use air pressure to open, close or adjust valves. They are also called pneumatic actuators or pneumatic devices, but they are generally referred to as pneumatic heads. Pneumatic actuators are sometimes equipped with certain auxiliary devices. Commonly used ones include valve positioners and handwheel mechanisms. The types and structures of the regulating mechanisms of pneumatic actuators are roughly the same, and the main difference is the actuators. Therefore, when introducing pneumatic actuators, they are divided into two parts: actuators and regulating valves. Pneumatic actuators consist of actuators and regulating valves (regulating mechanisms). According to the size of the control signal, a corresponding thrust is generated to push the regulating valve to operate. The regulating valve is the regulating part of the pneumatic actuator. Under the action of the thrust of the actuator, the regulating valve produces a certain displacement or angle of rotation to directly adjust the flow of the fluid.

[0003] For example, a 90° angular stroke pneumatic actuator and its limit device disclosed in Chinese patent publication number CN209458465U include an actuator body and a piston arranged in the actuator body, the actuator body is provided with a first gas inlet and a second gas inlet, a limit rack is fixed on the piston, a limit piece is provided in the actuator body, the limit piece includes a gear shaft adapted to mesh with the limit rack, a limit block arranged in a diamond shape is integrally provided at the end of the gear shaft, and two limit rods for limiting the rotation angle of the limit block are also provided in the actuator body, the maximum rotation angle of the limit block between the two limit rods is 90°, the present application utilizes the rotation of the limit block to control the stroke of the pneumatic actuator, and the stroke adjustment has an adjustment range of ±5° at the two positions of 0° and 90°, so as to control the precise opening or closing of the rotary valve, improve the reliability and accuracy of the action, avoid the reduction of accuracy after wear, and prevent the occurrence of hysteresis; in actual use, the following problems still exist.

[0004] In the above documents, the stroke of the piston cannot be guaranteed to be effectively formed during use. At the same time, it is only one-way pneumatic when performing pneumatic operation, and two-way pneumatic operation cannot be achieved. The rotation direction cannot reach 180°, and during the pneumatic execution, the motion trajectory cannot be limited, and the limiting effect is poor. Utility Model Content

[0005] The utility model provides a pneumatic actuator limit device to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A pneumatic actuator limit device comprises two sets of sealing covers, wherein the opposite surfaces of the two sealing covers are fixedly mounted with actuator components, the top of the actuator components is movably mounted with a limit component, the front of the actuator components is fixedly mounted with a pneumatic actuator, the bottom of the pneumatic actuator is fixedly plugged with an air pipe, and the front of the bottom of the pneumatic actuator is movably mounted with a valve.

[0008] A further improvement of the technical solution of the utility model is that the actuator assembly includes a shell, the left and right ends of the shell are fixedly connected to the opposite surfaces of the two groups of covers respectively, the top of the shell is movably installed on the bottom of the limit assembly, the front of the shell is fixedly installed on the back of the pneumatic actuator, the inside of the shell is rotatably connected to a gear, and the inside of the shell is slidably connected to two groups of pistons.

[0009] A further improvement of the technical solution of the utility model is that the opposite surfaces of the two pistons are fixedly connected with teeth distributed in a linear array, the teeth are meshed with the outer surface of the gear, and the ends of the two pistons away from the gear are rubber parts.

[0010] A further improvement of the technical solution of the utility model is that two groups of limit rods are fixedly inserted on the front side of the shell, the top of the shell is rotatably connected to a connecting seat and the bottom end of the connecting seat passes through the shell and is fixedly connected to the top of the gear, the outer surface of the connecting seat is fixedly connected to a cam one and the outer surface of the cam one is movably connected to the tail ends of the two groups of limit rods respectively.

[0011] A further improvement of the technical solution of the utility model is that: a transmission rod is rotatably connected to the bottom of the shell, and the top of the transmission rod is fixedly connected to the bottom end of the gear, and a sealing ring is fixedly connected to the outer surface of the transmission rod.

[0012] A further improvement of the technical solution of the utility model is that the limiting assembly includes two groups of bases, the bottom surfaces of the two bases are movably mounted on the top surface of the shell, the opposite surfaces of the two bases are provided with slots, the insides of the two slots are fixedly connected with slide rails, the outer surfaces of the two slide rails are slidably connected with sliders, the outer surfaces of the two sliders are movably plugged with fixing rods and the ends of the two groups of fixing rods are movably clamped with the outer surfaces of the two groups of slide rails.

[0013] A further improvement of the technical solution of the utility model is that the opposite surfaces of the two sliding blocks are fixedly connected to a limit box, the bottom surface of the limit box is rotatably connected to a connecting rod, and the bottom end of the connecting rod is movably engaged with the top of the connecting seat.

[0014] A further improvement of the technical solution of the utility model is that: the internal rotation of the limit box is connected with a linkage rod and the bottom end of the linkage rod is fixedly connected to the top end of the connecting rod, the outer surface of the linkage rod is fixedly connected with cam 2, the internal rotation of the limit box is connected with a micro switch and the front side of the micro switch is movably overlapped with the outer surface of cam 2.

[0015] Due to the adoption of the above technical solution, the utility model has achieved the following technical progress compared with the prior art:

[0016] 1. The utility model provides a pneumatic actuator limit device, which provides gas through an air pipe and is driven into the actuator by the pneumatic actuator. The gas is filled in the actuator to form high pressure, thereby achieving a pneumatic effect, and can achieve bidirectional pneumatics during the pneumatic process, thereby achieving a more efficient travel distance, and when the actuator is pneumatically operated, the limit component will limit the rotation process to avoid malfunctions caused by excessive pneumatic travel distance, and the rotation angle is strictly in accordance with the 180° standard.

[0017] 2. The utility model provides a pneumatic actuator limit device. By setting gears and pistons, when gas enters the inner cavity of the shell, the gas filling position is in the middle of the two groups of pistons. With the continuous injection of gas, the pistons slide to both sides in the shell, and the gears are driven to rotate by the teeth meshing with the gears, thereby completing the pneumatic effect and having a better travel angle. Cam 2 and a micro switch are set. When the gear rotates, cam 2 will follow the rotation. When the protrusion on the surface touches the micro switch during rotation, the micro switch disconnects the circuit, allowing the valve on the pneumatic actuator to close the air intake, thereby stopping the pneumatic process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 It is a schematic diagram of the structure of the utility model in a separated state;

[0020] Figure 3 It is a structural schematic diagram of the execution component of the utility model;

[0021] Figure 4 This is a structural sectional view of the housing of the utility model;

[0022] Figure 5 It is a structural schematic diagram of the limit assembly of the utility model;

[0023] Figure 6 It is a partial structural sectional view of the limiting component of the utility model.

[0024] In the figure: 1. actuator; 11. housing; 12. limit rod; 13. piston; 14. connecting seat; 15. gear; 16. cam 1; 17. sealing ring; 18. transmission rod; 2. cover; 3. limit assembly; 31. limit box; 32. base; 33. slide rail; 34. slider; 35. fixing rod; 36. connecting rod; 37. linkage rod; 38. cam 2; 39. micro switch; 4. pneumatic actuator; 5. air pipe; 6. valve. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0026] like Figure 1 , Figure 2 As shown, a pneumatic actuator limit device includes two sets of cover covers 2, the opposite surfaces of the two cover covers 2 are fixedly installed with an actuator assembly 1, the top of the actuator assembly 1 is movably installed with a limit assembly 3, the front of the actuator assembly 1 is fixedly installed with a pneumatic actuator 4, the bottom of the pneumatic actuator 4 is fixedly plugged with an air pipe 5, and the front of the bottom of the pneumatic actuator 4 is movably installed with a valve 6.

[0027] like Figure 3 , Figure 4 As shown, the actuator 1 includes a shell 11, the left and right ends of the shell 11 are fixedly connected to the opposite surfaces of the two sets of covers 2 respectively, the top of the shell 11 is movably installed with the bottom of the limit assembly 3, the front of the shell 11 is fixedly installed with the back of the pneumatic actuator 4, the inside of the shell 11 is rotatably connected with a gear 15, and the inside of the shell 11 is slidably connected with two sets of pistons 13.

[0028] Furthermore, teeth distributed in a linear array are fixedly connected to the opposite surfaces of the two pistons 13 , and the teeth are meshed with the outer surface of the gear 15 . The ends of the two pistons 13 away from the gear 15 are both rubber parts.

[0029] Gears 15 and pistons 13 are provided. When gas enters the inner cavity of the shell 11, the filling position of the gas is in the middle of the two groups of pistons 13. With the continuous injection of gas, the pistons 13 slide to both sides in the shell 11, and the gears 15 are driven to rotate through the teeth meshing with the gears 15, thereby achieving a pneumatic effect and having a better travel angle.

[0030] like Figure 3 , Figure 4 As shown, two groups of limit rods 12 are fixedly inserted on the front side of the shell 11, the top of the shell 11 is rotatably connected to a connecting seat 14 and the bottom end of the connecting seat 14 passes through the shell 11 and is fixedly connected to the top of the gear 15, the outer surface of the connecting seat 14 is fixedly connected to a cam 16 and the outer surfaces of the cam 16 are movably connected to the tail ends of the two groups of limit rods 12 respectively.

[0031] A cam 16 and a limiting rod 12 are provided. When the cam 16 rotates following the gear 15 , two protrusions on the cam 16 will contact the limiting rod 12 , and the fixed limiting rod 12 will limit the rotation of the gear 15 .

[0032] like Figure 3 , Figure 4 As shown, a transmission rod 18 is rotatably connected to the bottom of the housing 11 , and the top of the transmission rod 18 is fixedly connected to the bottom end of the gear 15 . A sealing ring 17 is fixedly connected to the outer surface of the transmission rod 18 .

[0033] A sealing ring 17 and a transmission rod 18 are provided, and the transmission rod 18 is connected to the control rod of the valve body to control the opening and closing of the valve body, while the sealing ring 17 ensures that no leakage occurs after gas is injected.

[0034] like Figure 5 , Figure 6 As shown, the limit assembly 3 includes two groups of bases 32, the bottom surfaces of the two bases 32 are movably mounted on the top surface of the shell 11, the opposite surfaces of the two bases 32 are provided with slots, the interiors of the two slots are fixedly connected with slide rails 33, the outer surfaces of the two slide rails 33 are slidably connected with sliders 34, the outer surfaces of the two sliders 34 are movably inserted with fixing rods 35, and the ends of the two groups of fixing rods 35 are movably clamped with the outer surfaces of the two groups of slide rails 33.

[0035] Furthermore, the opposite surfaces of the two sliders 34 are fixedly connected to the limit box 31 , the bottom surface of the limit box 31 is rotatably connected to a connecting rod 36 , and the bottom end of the connecting rod 36 is movably engaged with the top of the connecting seat 14 .

[0036] A slider 34 and a slide rail 33 are provided. The slider 34 slides on the slide rail 33 , thereby driving the limit box 31 to move up and down, so that the connecting rod 36 can be smoothly engaged with the connecting seat 14 .

[0037] like Figure 5 , Figure 6 As shown, the internal rotation of the limit box 31 is connected to a linkage rod 37 and the bottom end of the linkage rod 37 is fixedly connected to the top end of the connecting rod 36, the outer surface of the linkage rod 37 is fixedly connected to a cam 2 38, the internal rotation of the limit box 31 is connected to a micro switch 39 and the front side of the micro switch 39 is movably overlapped with the outer surface of the cam 2 38.

[0038] Cam 2 38 and micro switch 39 are set. When gear 15 rotates, cam 2 38 will rotate accordingly. When the protrusion on the surface touches micro switch 39 during rotation, micro switch 39 disconnects the circuit, allowing valve 6 on pneumatic actuator 4 to close the air intake, thereby stopping the pneumatic process.

[0039] The working principle of the utility model is as follows: the connecting base 32 is fixed on the housing 11 by a screw rod, and then the fixing rod 35 is loosened to allow the slider 34 to slide smoothly on the base 32, so that the bottom end of the connecting rod 36 can be connected to the top of the connecting seat 14 to form a linkage, and then the fixing rod 35 is fixed, and the gas provided by the air pipe 5 is injected into the housing 11 from the pneumatic gas. After the gas enters, it is located between the two groups of pistons 13. As the amount of gas injected increases, the gas pushes the two groups of pistons 13 to move in both directions in the housing 11, and the teeth on the surface are engaged to drive the gear 15 to rotate. As the gear 15 The transmission rod 18 at the bottom of the rotation can follow the rotation, and the transmission rod 18 can be connected to the control rod of the valve body to control the opening and closing of the valve body, and the sealing ring 17 ensures that there will be no leakage after the gas is injected. When the cam 16 follows the gear 15 to rotate, the two protrusions on the cam 16 will contact the limit rod 12, and the fixed limit rod 12 will limit the rotation of the gear 15. At the same time, the cam 2 38 will also follow the rotation. When the protrusion on the surface touches the micro switch 39 during rotation, the micro switch 39 disconnects the circuit, allowing the valve 6 on the pneumatic actuator 4 to close the air intake, thereby stopping the pneumatic process.

[0040] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not deviate from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A pneumatic actuator limit device, comprising two sets of covers (2), characterized in that: An actuator (1) is fixedly mounted on opposite surfaces of the two sealing covers (2); a limit assembly (3) is movably mounted on the top of the actuator (1); an air actuator (4) is fixedly mounted on the front of the actuator (1); an air pipe (5) is fixedly plugged into the bottom of the air actuator (4); and a valve (6) is movably mounted on the front of the bottom of the air actuator (4); The limit assembly (3) comprises two groups of bases (32), the bottom surfaces of the two bases (32) are movably mounted on the top surface of the shell (11), the opposite surfaces of the two bases (32) are provided with slots, the interiors of the two slots are fixedly connected with slide rails (33), the outer surfaces of the two slide rails (33) are slidably connected with sliders (34), the outer surfaces of the two sliders (34) are movably plugged with fixing rods (35), and the ends of the two groups of fixing rods (35) are movably engaged with the outer surfaces of the two groups of slide rails (33).

2. A pneumatic actuator limit device according to claim 1, characterized in that: The actuator assembly (1) comprises a shell (11), the left and right ends of the shell (11) are respectively fixedly connected to the opposite surfaces of the two sets of sealing covers (2), the top of the shell (11) is movably mounted on the bottom of the limit assembly (3), the front of the shell (11) is fixedly mounted on the back of the pneumatic actuator (4), the interior of the shell (11) is rotatably connected to a gear (15), and the interior of the shell (11) is slidably connected to two sets of pistons (13).

3. A pneumatic actuator limit device according to claim 2, characterized in that: The opposing surfaces of the two pistons (13) are fixedly connected with teeth distributed in a linear array, the teeth meshing with the outer surface of the gear (15), and the ends of the two pistons (13) away from the gear (15) are both rubber parts.

4. A pneumatic actuator limit device according to claim 2, characterized in that: Two groups of limit rods (12) are fixedly inserted on the front of the shell (11); the top of the shell (11) is rotatably connected to a connecting seat (14), and the bottom end of the connecting seat (14) passes through the shell (11) and is fixedly connected to the top of the gear (15); the outer surface of the connecting seat (14) is fixedly connected to a cam 1 (16), and the outer surface of the cam 1 (16) is movably connected to the tail ends of the two groups of limit rods (12).

5. A pneumatic actuator limit device according to claim 2, characterized in that: The bottom of the housing (11) is rotatably connected to a transmission rod (18), and the top end of the transmission rod (18) is fixedly connected to the bottom end of the gear (15). The outer surface of the transmission rod (18) is fixedly connected to a sealing ring (17).

6. A pneumatic actuator limit device according to claim 1, characterized in that: The opposite surfaces of the two sliding blocks (34) are fixedly connected to a limit box (31), the bottom surface of the limit box (31) is rotatably connected to a connecting rod (36), and the bottom end of the connecting rod (36) is movably engaged with the top of the connecting seat (14).

7. A pneumatic actuator limit device according to claim 6, characterized in that: The limit box (31) is internally rotatably connected to a linkage rod (37), and the bottom end of the linkage rod (37) is fixedly connected to the top end of the connecting rod (36); the outer surface of the linkage rod (37) is fixedly connected to a second cam (38); the limit box (31) is internally rotatably connected to a micro switch (39), and the front surface of the micro switch (39) is movably overlapped with the outer surface of the second cam (38).

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