A pneumatic actuator

Abstract

The utility model relates to actuator technical field, concretely is a kind of pneumatic actuator, including cylinder body, 2 symmetrical piston assembly, rotating shaft assembly and end cover.Cylinder body is divided into rotating shaft assembly working chamber and both sides piston assembly working chamber, rotating shaft assembly working chamber has with air inlet hole and air outlet hole;Piston assembly contains piston and the elastic support mechanism consisting of flat spring, guide sleeve, guide rod;Rotating shaft assembly realizes accurate assembly by tooth road and foolproof structure.When air intake, rotating shaft assembly working chamber pressurization drive double-piston reverse motion and compress spring, rotating shaft is opened valve by yoke driving;When pressure relief, spring reset drive double-piston approach motion, reverse driving rotating shaft valve closing.The utility model improves reset reliability, power transmission efficiency and control accuracy, prolongs equipment life, applicable to high-precision valve control scene.

Description

Technical Field

[0001] This utility model relates to the field of actuator technology, and in particular to a pneumatic actuator. Background Technology

[0002] In the field of industrial automation control, pneumatic actuators are the core equipment for driving valve movements, and their performance is directly related to the stability and safety of industrial processes. However, their existing structures have significant defects in two aspects: elastic support at the piston end and connection of the rotating shaft assembly.

[0003] Regarding the elastic support at the piston end, traditional single-acting pneumatic actuators often use a single spring to achieve elastic reset between the piston and the end cap. This structure is prone to fatigue failure due to the long-term unidirectional compression force on the spring, resulting in poor reset reliability. The concentrated force on a single spring can easily cause piston tilting, leading to uneven wear of the cylinder wall, air leakage, and increased component wear. The reset force changes drastically with the compression amount. Excessive impact force at the initial valve closing stage can easily damage the valve, while insufficient force in the later stage may result in incomplete valve closure. Furthermore, the limited installation space for the spring makes it difficult to provide a large reset torque, making it unsuitable for large-diameter valves. At the same time, the high coaxiality requirement between the spring and the piston makes assembly deviations prone to jamming, significantly reducing the stability and lifespan of the actuator.

[0004] Regarding the connection of rotary shaft assemblies, existing actuators mostly use pin connections for the rotary shaft, lever, and angle adjustment block. The pins are assembled by inserting cylindrical or conical pins into pin holes at corresponding positions on the components. While the structure is simple, it has poor positioning guidance, which makes it easy for the rotary shaft to be installed backwards or crookedly, and for the lever and angle adjustment block to be misaligned during assembly. This disrupts the fit with the lever fork, preventing the piston power from being effectively transmitted and making it impossible to accurately control the valve opening and closing, thus affecting the on / off accuracy and parameter stability of the industrial process. At the same time, installation deviations will exacerbate uneven stress on the components, accelerate the wear of components such as the rotary shaft, lever fork, and lever, and cause abnormal vibration, noise, or even jamming, increasing maintenance costs and downtime, reducing production and maintenance efficiency, and compromising product performance stability.

[0005] These problems severely restrict the reliable application of pneumatic actuators and urgently need to be solved through structural optimization. Utility Model Content

[0006] The purpose of this utility model is to overcome the problems of the prior art and provide a pneumatic actuator to solve the problems of easy failure, uneven force, unstable reset, insufficient torque, and easy jamming in the single spring connection between the piston and end cover of the existing pneumatic actuator; easy to install the rotating shaft, toggle block and angle adjustment block pin connection in reverse, crooked or misaligned, resulting in poor power transmission and inaccurate valve control; and unreasonable layout of the cylinder chamber due to unreasonable division of the cylinder body, which affects the stability, accuracy and life of the actuator.

[0007] The above objectives are achieved through the following technical solutions:

[0008] A pneumatic actuator includes a cylinder body, two symmetrically arranged piston assemblies, a rotary shaft assembly, and two end caps. The cylinder body is sealed at both ends by the end caps to form working chambers. Each working chamber includes a central rotary shaft assembly working chamber and two side piston assembly working chambers, which are interconnected. The rotary shaft assembly is disposed within its working chamber, and the two piston assemblies are respectively disposed within the side piston assembly working chambers and are drively connected to the rotary shaft assembly. An air inlet and an air outlet are provided on the cylinder body corresponding to the rotary shaft assembly working chamber. Each piston assembly includes a piston and a piston-end elastic support mechanism. The rotary shaft assembly includes a rotary shaft, a lever, and an angle adjustment block. The air inlet and outlet are used to control external pressure input and release, driving the two piston assemblies to move in opposite directions or towards each other. The piston-end elastic support mechanism is used to achieve elastic reset of the pistons. The rotary shaft assembly converts the linear motion of the two pistons into rotational motion to drive a valve.

[0009] Furthermore, the piston end elastic support mechanism includes a spring assembly, a first spring assembly slot disposed on the outer side wall of the piston, and a second spring assembly slot disposed on the inner wall of the end cap. One end of the spring assembly is inserted into the first spring assembly slot, and the other end is inserted into the second spring assembly slot.

[0010] Furthermore, the spring assembly includes four flat springs arranged in parallel to each other. One end of each flat spring is sleeved on a first guide sleeve, and the other end is sleeved on a second guide sleeve. The first guide sleeve and the second guide sleeve are respectively movably sleeved on both ends of the same guide rod.

[0011] Furthermore, the first guide sleeve is T-shaped and includes a first guide sleeve seat and a first guide sleeve rod connected to each other, as well as a first guide rod through hole for the guide rod to pass through; the second guide sleeve is T-shaped and includes a second guide sleeve seat and a second guide sleeve rod connected to each other, as well as a second guide rod through hole for the guide rod to pass through; the length of the guide rod is greater than the length of the flat spring in its contracted state and less than its length in its extended state.

[0012] Furthermore, the outer wall of the piston is provided with a circular piston groove, and the first spring assembly slot is disposed in the piston groove, including four first spring slots symmetrically arranged with the center of the piston groove. The outer side of each first spring slot is connected to the inner wall of the piston groove, and the side sides of adjacent first spring slots are connected by a first reinforcing rib. The bottom wall of the first spring slot is provided with a first bottom wall guide groove for the guide rod to be inserted.

[0013] Furthermore, the end cap includes a circular end cap cavity with an opening facing the piston, and a second spring assembly slot is provided in the end cap cavity; the second spring assembly slot includes four second spring slots symmetrically arranged around the center of the end cap cavity for insertion of the second guide sleeve and the end of the spring; the outer side of each second spring slot is connected to the inner wall of the end cap cavity, and the sides of adjacent second spring slots are connected by a second reinforcing rib; a second bottom wall guide groove is also provided on the bottom wall of the second spring slot for insertion of the guide rod.

[0014] Furthermore, the outer wall of the rotating shaft is provided with a toothed path extending axially, the shift block is provided with a shift block insertion hole, and the hole wall of the shift block insertion hole is provided with a shift block tooth groove adapted to the toothed path; the angle adjustment block is provided with an angle adjustment block insertion hole, and the hole wall of the angle adjustment block insertion hole is provided with an angle adjustment block tooth groove adapted to the toothed path, the toothed path meshes with the shift block tooth groove and the angle adjustment block tooth groove to realize power transmission; the inner sides of the two pistons are each connected to a shift fork, and the shift fork is drivenly connected to the shift block.

[0015] Furthermore, the rotating shaft has anti-misbehavior protrusions on its toothed path, the inner wall of the lever tooth groove has anti-misbehavior grooves adapted to the anti-misbehavior protrusions, and the inner wall of the angle adjustment block tooth groove has angle adjustment block anti-misbehavior grooves adapted to the anti-misbehavior protrusions.

[0016] Furthermore, the cylinder body, the rotating shaft, the lever, the angle adjustment block, and the end cover are all made of metal.

[0017] Furthermore, the dial is provided with arrow markings for indicating the installation direction.

[0018] The pneumatic actuator provided by this utility model achieves significant technical benefits through an optimized design that integrates a piston-end elastic support mechanism and a rotary shaft assembly. The piston end employs four symmetrically distributed flat spring assemblies, along with guide sleeves and guide rods, to distribute force and reduce the risk of fatigue failure. This results in a smooth change in reset force, avoiding valve impact and incomplete closure, thus improving reset reliability and lifespan. Simultaneously, it provides greater reset torque within a limited space, adapting to large-diameter valves, reducing piston tilt and cylinder wall wear, and lowering the probability of jamming. The rotary shaft assembly, through gear meshing and a foolproof structure, ensures precise assembly of the rotary shaft, lever, and angle adjustment block, preventing reverse installation and misalignment. This improves power transmission efficiency and valve control accuracy, reduces component wear, shortens assembly and maintenance time, and enhances overall actuator stability and lifespan, meeting the demands of complex industrial environments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a pneumatic actuator according to the present invention;

[0020] Figure 2 This is an exploded view of a pneumatic actuator according to the present invention;

[0021] Figure 3 This is a first-view sectional view of a pneumatic actuator according to the present invention;

[0022] Figure 4 This is a second-view sectional view of a pneumatic actuator according to the present invention;

[0023] Figure 5 This is a schematic diagram of the assembly of the rotary shaft assembly and the shift fork in a pneumatic actuator according to the present invention;

[0024] Figure 6 This is an exploded view of the rotary shaft assembly in a pneumatic actuator according to the present invention;

[0025] Figure 7 This is a first-view structural schematic diagram of the spring assembly in a pneumatic actuator according to the present invention;

[0026] Figure 8 This is a second-view structural schematic diagram of the spring assembly in a pneumatic actuator according to the present invention;

[0027] Figure 9 This is a schematic diagram showing the connection between the guide rod and the guide sleeve in a pneumatic actuator according to the present invention;

[0028] Figure 10 This is a schematic diagram of the first spring assembly slot structure of the piston in a pneumatic actuator according to the present invention;

[0029] Figure 11 This is a schematic diagram of the second spring assembly slot structure of the end cover of a pneumatic actuator according to the present invention.

[0030] Illustration markings:

[0031] 1-Cylinder block, 101-Rotary shaft assembly working chamber, 102-Piston assembly working chamber, 103-Inlet port, 104-Outlet port;

[0032] 2-Piston assembly;

[0033] 3-Piston, 301-Piston groove, 302-First spring assembly slot, 303-First spring slot, 304-First reinforcing rib, 305-First bottom wall guide groove;

[0034] 4-Piston end elastic support mechanism, 401-Spring assembly, 402-Flat spring, 403-First guide sleeve, 404-Second guide sleeve, 405-Guide rod, 406-First guide sleeve seat, 407-First guide sleeve rod, 408-First guide rod through hole, 409-Second guide sleeve seat, 410-Second guide sleeve rod, 411-Second guide rod through hole;

[0035] 5-End cap, 501-End cap cavity, 502-Second spring assembly slot, 503-Second spring slot, 504-Second reinforcing rib, 505-Second bottom wall guide groove;

[0036] 6-Rotating shaft assembly, 601-Rotating shaft, 602-Pulley block, 603-Angle adjustment block, 604-Gear path, 605-Anti-foolproof protrusion, 606-Pulley block insertion hole, 607-Pulley block tooth groove, 608-Pulley block anti-foolproof groove, 609-Angle adjustment block insertion hole, 610-Angle adjustment block tooth groove, 611-Angle adjustment block anti-foolproof groove;

[0037] 7-Shift fork;

[0038] 8-Adjusting screw. Detailed Implementation

[0039] The present invention will be further described in detail below with reference to the figures and embodiments.

[0040] like Figures 1-4 As shown, a pneumatic actuator includes a cylinder body 1, two symmetrically arranged piston assemblies 2, a rotary shaft assembly 6, and two end caps 5. The cylinder body 1 is sealed at both ends by the end caps 5 to form a working chamber. The working chamber includes a rotary shaft assembly working chamber 101 in the middle and piston assembly working chambers 102 on both sides. The rotary shaft assembly working chamber 101 is interconnected with the piston assembly working chambers 102 on both sides. The rotary shaft assembly 6 is disposed in the rotary shaft assembly working chamber 101, and the two piston assemblies 2 are respectively disposed in the piston assembly working chambers 102 on both sides and are drively connected to the rotary shaft assembly 6.

[0041] The cylinder body 1 corresponding to the working chamber 101 of the rotating shaft assembly is provided with an air inlet 103 and an air outlet 104.

[0042] The piston assembly 2 includes a piston 3 and a piston end elastic support mechanism 4, and the rotating shaft assembly 6 includes a rotating shaft 601, a lever 602 and an angle adjustment block 603.

[0043] The air inlet 103 and the air outlet 104 are used to control the input and release of external pressure, drive the two piston assemblies 2 to move in opposite directions or towards each other, the piston end elastic support mechanism 4 is used to realize the elastic reset of the piston 3, and the rotating shaft assembly 6 is used to convert the linear motion of the two pistons 3 into rotational motion to drive the valve to act.

[0044] Working principle:

[0045] When external pressure is input into the air inlet 103, the pressure inside the working chamber 101 of the rotating shaft assembly increases, driving the two piston assemblies 2 to move in opposite directions and compress the spring assembly 401. The piston 3 drives the lever block 602 to rotate via the fork 7, thereby driving the rotating shaft 601 to rotate to open the valve. When the air outlet 104 releases pressure, the spring assembly 401 resets and drives the two piston assemblies 2 to move in opposite directions. The fork 7 drives the lever block 602 and the rotating shaft 601 to rotate in the opposite direction to close the valve.

[0046] In this embodiment, the piston end elastic support mechanism 4 includes a spring assembly 401, a first spring assembly slot 302 disposed on the outer side wall of the piston 3, and a second spring assembly slot 502 disposed on the inner wall of the end cap 5. One end of the spring assembly 401 is inserted into the first spring assembly slot 302, and the other end is inserted into the second spring assembly slot 502.

[0047] like Figures 7-9 As shown, specifically, the spring assembly 401 includes four flat springs 402 arranged in parallel with each other. One end of each flat spring 402 is sleeved on a first guide sleeve 403, and the other end is sleeved on a second guide sleeve 404. The first guide sleeve 403 and the second guide sleeve 404 are respectively movably sleeved on both ends of the same guide rod 405.

[0048] Specifically, a flat spring is made by winding a flat metal strip into a spiral shape with gaps between adjacent coils. Its cross-section is rectangular, unlike a circular cross-section spring. This structure allows for a more reasonable stress distribution when the spring is axially compressed, and its compact shape allows it to be arranged in a limited space.

[0049] Its use in actuators has the following advantages:

[0050] Stress and lifespan: The flat cross-section makes the spring more evenly stressed. Compared with the round cross-section spring, it has better fatigue resistance. When subjected to unidirectional force for a long time, it is not easy to fail quickly due to stress concentration, thus improving the reliability and lifespan of the actuator reset.

[0051] Reset characteristics: The reset force changes relatively smoothly with the amount of compression. When closing the valve, the initial impact force is small, and there is a stable force in the later stage, which can avoid valve impact and incomplete closing, making the actuator move more smoothly.

[0052] Space and Torque: The compact structure is adapted to the limited space of the actuator, allowing for the design of larger wire diameters and turns, providing greater reset torque in small installation spaces, meeting the needs of large-diameter valves, and broadening the application scenarios of the actuator.

[0053] Coaxiality and stability: During installation, the coaxiality of the flat spring and the piston is easily guaranteed, and it is not easy to get stuck due to assembly deviation, which improves the operating stability of the actuator, reduces component wear, and ensures long-term reliable operation.

[0054] In this embodiment, the first guide sleeve 403 is T-shaped and includes a first guide sleeve seat 406 and a first guide sleeve rod 407 connected to each other, as well as a first guide rod through hole 408 through which the guide rod 405 passes; the second guide sleeve 404 is T-shaped and includes a second guide sleeve seat 409 and a second guide sleeve rod 410 connected to each other, as well as a second guide rod through hole 411 through which the guide rod 405 passes; the length of the guide rod 405 is greater than the length of the flat spring 402 in its contracted state and less than its length in its extended state.

[0055] like Figure 2 and 10 As shown, in this embodiment, the outer wall of the piston 3 is provided with a circular piston groove 301. The first spring assembly slot 302 is disposed in the piston groove 301, including four first spring slots 303 symmetrically arranged around the center of the piston groove 301. The outer side of each first spring slot 303 is connected to the inner wall of the piston groove 301. The sides of adjacent first spring slots 303 are connected by a first reinforcing rib 304. The bottom wall of the first spring slot 303 is provided with a first bottom wall guide groove 305 for the guide rod 405 to be inserted.

[0056] like Figure 2 and 11 As shown, in this embodiment, the end cap 5 includes a circular end cap cavity 501 with an opening facing the piston 3, and a second spring assembly slot 502 is provided in the end cap cavity 501; the second spring assembly slot 502 includes four second spring slots 503 symmetrically arranged around the center of the end cap cavity 501 for insertion of the ends of the second guide sleeve 404 and the flat spring 402; the outer side of each second spring slot 503 is connected to the inner wall of the end cap cavity 501, and the sides of adjacent second spring slots 503 are connected by a second reinforcing rib 504; a second bottom wall guide groove 505 is also provided on the bottom wall of the second spring slot 503 for insertion of the guide rod 405.

[0057] The first bottom wall guide groove 305 and the second bottom wall guide groove 505 are used to provide space for the guide rod 405 to be stored when the spring is contracted, so as to facilitate the extension and retraction control of the spring.

[0058] like Figure 5 and 6 As shown, as an optimization of the rotating shaft assembly 6 in this embodiment, the outer wall of the rotating shaft 601 is provided with a toothed path 604 extending axially, the shift block 602 is provided with a shift block insertion hole 606, and the hole wall of the shift block insertion hole 606 is provided with a shift block tooth groove 607 adapted to the toothed path 604; the angle adjustment block 603 is provided with an angle adjustment block insertion hole 609, and the hole wall of the angle adjustment block insertion hole 609 is provided with an angle adjustment block tooth groove 610 adapted to the toothed path 604. The toothed path 604 meshes with the shift block tooth groove 607 and the angle adjustment block tooth groove 610 to realize power transmission; the inner sides of the two pistons 3 are each connected with a shift fork 7, and the shift fork 7 is connected to the shift block 602 in a driving connection.

[0059] In addition, a foolproof protrusion 605 is provided on the tooth path 604 of the rotating shaft 601, and a foolproof groove 608 adapted to the foolproof protrusion 605 is provided on the inner wall of the lever tooth groove 607. The corner adjustment block tooth groove 610 is provided with a corner adjustment block foolproof groove 611 adapted to the foolproof protrusion 605. As an embodiment of this solution, there are two foolproof protrusions 605, which are symmetrically arranged on the outer wall of the rotating shaft 601, and there are two foolproof grooves 608 and two corner adjustment block foolproof grooves 611.

[0060] It should be noted that the cylinder body 1, the rotating shaft 601, the lever 602, the angle adjustment block 603 and the end cover 5 are all made of metal materials, such as stainless steel; the inner walls of the working chamber 101 of the rotating shaft assembly and the working chamber 102 of the piston assembly are provided with anti-corrosion coatings.

[0061] As an optimization of the toggle block, the toggle block 602 is provided with arrow markings for indicating the installation direction.

[0062] As a further explanation of this solution, a pneumatic actuator includes a cylinder body 1, two symmetrically arranged piston assemblies 2, a rotary shaft assembly 6, and two end caps 5, with the following specific structure:

[0063] (1) Cylinder block 1

[0064] The cylinder body 1 is a hollow cavity, with both ends sealed by end caps 5 to form working chambers. The working chambers are axially divided into three parts: a central rotating shaft assembly working chamber 101 and two symmetrically positioned piston assembly working chambers 102. The inner diameter of the rotating shaft assembly working chamber 101 is smaller than that of the piston assembly working chamber 102, forming a stepped structure to ensure sealing during piston assembly 2 movement. The cylinder body 1 sidewall corresponding to the rotating shaft assembly working chamber 102 has an air inlet 103 and an air outlet 104, used for inputting compressed air (external pressure) and discharging gas, respectively, to control the movement of the piston assembly 2. The inner walls of the cylinder body 1 are precision machined and coated with an anti-corrosion coating to improve corrosion resistance and wear resistance.

[0065] (2) Piston assembly 2

[0066] Two piston assemblies 2 are symmetrically arranged in the piston assembly working chambers 102 on both sides. Each piston assembly 2 includes a piston 3 and a piston end elastic support mechanism 4. Specifically:

[0067] Piston 3: Made of corrosion-resistant and high-pressure resistant material, such as rubber, in the shape of a disc. The outer wall is sealed to the inner wall of the working chamber 102 of the piston assembly (achieved by a sealing ring). The inner side (the side facing the rotating shaft assembly 6) is provided with a fork connecting seat for installing the fork 7. The outer wall (the side away from the rotating shaft assembly 6) is provided with a circular piston groove 301 for accommodating the elastic support mechanism.

[0068] The piston end elastic support mechanism 4 includes a first spring assembly slot 302, a second spring assembly slot 502, and a spring assembly 401. The first spring assembly slot 302 is located inside the piston groove 301 and contains four first spring slots 303 symmetrically distributed around the center of the groove 301. Adjacent slots are connected by a first reinforcing rib 304, and the bottom wall is provided with a first bottom wall guide groove 305. The second spring assembly slot 502 is located on the inner wall of the end cap 5 and corresponds one-to-one with the first spring assembly slot 302. It contains four symmetrically distributed second spring slots 503, adjacent slots are connected by a second reinforcing rib 504, and the bottom wall is provided with a second bottom wall guide groove 505. The spring assembly 401 consists of four parallel flat springs 402, with both ends respectively fitted onto a T-shaped first guide sleeve 403 and a second guide sleeve 404. A guide rod 405 passes through the through hole of the two guide sleeves and is inserted into the first and second bottom wall guide grooves at both ends to ensure the coaxiality and stability of the springs during extension and contraction.

[0069] (3) Rotary shaft assembly 6

[0070] The rotating shaft assembly 6 is disposed within the working cavity 101 of the rotating shaft assembly, and includes a rotating shaft 601, a lever 602, and an angle adjustment block 603, specifically:

[0071] Rotary shaft 601: The bottom end is connected to the valve, and the outer wall is provided with a toothed path 604 extending along the axial direction. Two anti-foolproof protrusions 605 are symmetrically provided on the toothed path 604 for precise positioning and assembly.

[0072] The lever 602 is provided with a lever insertion hole 606, the lever tooth groove 607 on the hole wall meshes with the tooth path 604 of the rotating shaft, and the two lever anti-fooling grooves 608 on the inner wall are adapted to the anti-fooling protrusions; the two sides of the lever 602 contact the lever forks 7 connected to the two pistons 3, which are used to convert the linear motion of the piston into the rotational motion of the rotating shaft 601. The lever 602 is provided with arrow marks to assist in installation and positioning.

[0073] Angle adjustment block 603: Sleeved on the rotating shaft 601, the angle adjustment block tooth groove 610 on the hole wall meshes with the tooth path 604, and the two angle adjustment block anti-fooling grooves 611 on the inner wall are adapted to the anti-fooling protrusions; by adjusting the screw 8 and cooperating with the angle adjustment block 603 in the working cavity 101 of the rotating shaft assembly, the rotation angle of the rotating shaft 601 is limited (0°-90°), ensuring that the valve is fully open and closed.

[0074] Assembly process of rotating shaft assembly 6: Align the anti-foolproof protrusion 605 of rotating shaft 601 with the anti-foolproof groove 608 of the lever 602, so that the teeth mesh, and put the lever 602 into the middle of rotating shaft 601; assemble the angle adjustment block 603 in the same way, and pre-tighten it by adjusting screw 8.

[0075] Working principle of this pneumatic actuator:

[0076] 1. Valve opening process: External compressed air enters the working chamber 101 of the rotating shaft assembly through the air inlet 103, the pressure in the chamber increases, and pushes the piston assemblies 2 on both sides to move in opposite directions (away from the rotating shaft assembly 6); when the piston 3 moves, it compresses the spring assembly 401 (the spring stores elastic potential energy), and at the same time drives the lever 602 to rotate through the inner lever fork 7; the lever 602 engages with the rotating shaft 601 through the toothed path 604, driving the rotating shaft 601 to rotate 90° clockwise, thus opening the valve; at this time, one side of the angle adjustment block 603 contacts the adjustment screw 8, limiting the excessive rotation of the rotating shaft.

[0077] 2. Valve closing process: The vent 104 opens, the working chamber 101 of the rotating shaft assembly is depressurized, and the pressure in the chamber drops to atmospheric pressure; the spring assembly 401 releases elastic potential energy, driving the piston assemblies 401 on both sides to move in opposite directions (closer to the rotating shaft assembly 6); the piston 3 drives the lever block 602 to rotate in the opposite direction through the lever fork 7, and the lever block 602 drives the rotating shaft 601 to rotate 90° counterclockwise, thus closing the valve; the other side of the angle adjustment block 603 contacts another adjusting screw 8 to complete the limit.

[0078] The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be conceived by those skilled in the art within the scope of the technology disclosed in this utility model are included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A pneumatic actuator, characterized in that, The cylinder body (1) includes two symmetrically arranged piston assemblies (2), a rotating shaft assembly (6), and two end caps (5). The cylinder body (1) is sealed at both ends by the end caps (5) to form a working chamber. The working chamber includes a rotating shaft assembly working chamber (101) in the middle and piston assembly working chambers (102) on both sides. The rotating shaft assembly (6) is disposed in the rotating shaft assembly working chamber (101), and the two piston assemblies (2) are respectively disposed in the piston assembly working chambers (102) on both sides and are connected to the rotating shaft assembly (6) in a transmission manner. The cylinder body (1) corresponding to the working chamber (101) of the rotating shaft assembly is provided with an air inlet (103) and an air outlet (104). The piston assembly (2) includes a piston (3) and a piston end elastic support mechanism (4), and the rotating shaft assembly (6) includes a rotating shaft (601), a lever (602) and an angle adjustment block (603). The air inlet (103) and the air outlet (104) are used to control the input and release of external pressure, drive the two piston assemblies (2) to move in opposite directions or towards each other, the piston end elastic support mechanism (4) is used to realize the elastic reset of the piston (3), and the rotating shaft assembly (6) is used to convert the linear motion of the two pistons (3) into rotational motion to drive the valve to act.

2. A pneumatic actuator according to claim 1, characterized in that, The piston end elastic support mechanism (4) includes a spring assembly (401), a first spring assembly slot (302) disposed on the outer side wall of the piston (3), and a second spring assembly slot (502) disposed on the inner wall of the end cap (5). One end of the spring assembly (401) is inserted into the first spring assembly slot (302), and the other end is inserted into the second spring assembly slot (502).

3. A pneumatic actuator according to claim 2, characterized in that, The spring assembly (401) includes four flat springs (402) arranged in parallel with each other. One end of each flat spring (402) is sleeved on a first guide sleeve (403), and the other end is sleeved on a second guide sleeve (404). The first guide sleeve (403) and the second guide sleeve (404) are respectively movably sleeved on both ends of the same guide rod (405).

4. A pneumatic actuator according to claim 3, characterized in that, The first guide sleeve (403) is T-shaped and includes a first guide sleeve seat (406) and a first guide sleeve rod (407) connected to each other, and a first guide rod through hole (408) through which the guide rod (405) passes; the second guide sleeve (404) is T-shaped and includes a second guide sleeve seat (409) and a second guide sleeve rod (410) connected to each other, and a second guide rod through hole (411) through which the guide rod (405) passes.

5. A pneumatic actuator according to claim 2, characterized in that, The piston (3) has a circular piston groove (301) on its outer side wall. The first spring assembly slot (302) is located in the piston groove (301) and includes four first spring slots (303) symmetrically arranged around the center of the piston groove (301). The outer side of each first spring slot (303) is connected to the inner wall of the piston groove (301). The sides of adjacent first spring slots (303) are connected by a first reinforcing rib (304). The bottom wall of the first spring slot (303) is provided with a first bottom wall guide groove (305) for the guide rod (405) to be inserted.

6. A pneumatic actuator according to claim 2, characterized in that, The end cap (5) includes a circular end cap cavity (501) with an opening facing the piston (3), and a second spring assembly slot (502) is provided in the end cap cavity (501); the second spring assembly slot (502) includes four second spring slots (503) symmetrically arranged around the center of the end cap cavity (501), the outer side of each second spring slot (503) is connected to the inner wall of the end cap cavity (501), and the sides of adjacent second spring slots (503) are connected by a second reinforcing rib (504); a second bottom wall guide groove (505) is also provided on the bottom wall of the second spring slot (503) for the guide rod (405) to be inserted.

7. A pneumatic actuator according to claim 1, characterized in that, The outer wall of the rotating shaft (601) is provided with a toothed path (604) extending axially. The shift block (602) is provided with a shift block insertion hole (606). The hole wall of the shift block insertion hole (606) is provided with a shift block tooth groove (607) adapted to the toothed path (604). The angle adjustment block (603) is provided with an angle adjustment block insertion hole (609). The hole wall of the angle adjustment block insertion hole (609) is provided with an angle adjustment block tooth groove (610) adapted to the toothed path (604). The toothed path (604) meshes with the shift block tooth groove (607) and the angle adjustment block tooth groove (610) to realize power transmission. The inner sides of the two pistons (3) are connected with shift forks (7). The shift forks (7) are connected to the shift block (602) in a transmission connection.

8. A pneumatic actuator according to claim 7, characterized in that, The rotating shaft (601) has a toothed path (604) with anti-foolproof protrusions (605), the inner wall of the lever tooth groove (607) has a lever anti-foolproof groove (608) that matches the anti-foolproof protrusions (605), and the inner wall of the angle adjustment block tooth groove (610) has an angle adjustment block anti-foolproof groove (611) that matches the anti-foolproof protrusions (605).

9. A pneumatic actuator according to claim 8, characterized in that, The cylinder body (1), the rotating shaft (601), the lever (602), the angle adjustment block (603), and the end cover (5) are all made of metal.

10. A pneumatic actuator according to claim 1, characterized in that, The dial (602) is provided with an arrow mark for indicating the installation direction.

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