Rotary pneumatic actuator

Abstract

The utility model discloses a rotary pneumatic actuator which comprises an actuator body, a piston, a gear and an output shaft, the gear is arranged in the center of the interior of the actuator body, the output shaft penetrates through the center of the gear, movable blocks are arranged on the two sides of the gear, and the piston is arranged on the piston. Pistons are arranged on the two sides of the interior of the actuator body, one side of each piston is connected with a movable block, limiting sleeves are arranged at the two ends of the two sides of the interior of the actuator body, and a first air port and a second air port are formed in the top end of one side of the actuator body. By installing the actuator body, the first air port, the piston, the movable block, the rack, the gear, the output shaft, the limiting sleeve and the reset spring, when the reset spring is extruded and stretched, the limiting blocks on the two sides of the pressed column slide in the limiting grooves, the movement range of the reset spring is limited, the phenomena of distortion and deviation are not prone to occurring, and the service life of the actuator is prolonged. And the service life of the pneumatic actuator is prolonged.

Description

Technical Field

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

[0002] A pneumatic actuator is an actuator that uses air pressure to open, close or adjust a valve. It is also called a pneumatic actuator or a pneumatic device, which includes a rotary pneumatic actuator. Its working principle is to use air pressure to push the piston to drive the rack to make a linear motion, the rack drives the gear to make a rotary motion, and the gear shaft outputs torque and drives the external load to swing.

[0003] Rotary pneumatic actuators are widely used in the field of automation control and are generally connected to the valve body. When this type of pneumatic actuator is working, gas enters through the air inlet, causing the pistons on both sides to squeeze the springs, which in turn drive the racks to move and the gears to rotate, thereby outputting torque to open the valve. When the air intake stops, the potential energy of the spring is required to reset the piston. Since the structure of the spring is generally simple, it is prone to distortion and deviation during repeated squeezing and resetting, which will affect the normal use of the pneumatic actuator. Utility Model Content

[0004] The purpose of the utility model is to provide a rotary pneumatic actuator to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a rotary pneumatic actuator, comprising an actuator body, a piston, a gear and an output shaft, a gear is arranged at the central position inside the actuator body, and the output shaft passes through the central position of the gear, movable blocks are arranged on both sides of the gear, pistons are arranged on both sides inside the actuator body, and one side of the piston is connected to the movable block, limiting sleeves are arranged at both ends of both sides inside the actuator body, and pressure columns are arranged inside the limiting sleeves through reset springs, one end of the pressure columns is connected to the piston, and limiting blocks are arranged on both sides of one end of the pressure columns, limiting grooves matching the limiting blocks are opened on both sides of the limiting sleeve, and the top of one side of the actuator body is respectively provided with a first air port and a second air port.

[0006] Preferably, a connection end is provided at a central position of the bottom of the actuator body, and mounting holes are evenly provided at the edge of the bottom of the connection end.

[0007] Preferably, an air passage is opened on one side inside the actuator body, and the air passage is communicated with the second air port.

[0008] Preferably, the movable blocks are distributed symmetrically about the gear, and a rack is provided on one side of the movable block close to the gear.

[0009] Preferably, sealing sleeves are provided on the outer sides of the first air port and the second air port, and rubber protrusions are evenly distributed on the inner side walls of the sealing sleeves.

[0010] Preferably, a shaft sleeve is provided at a central position of the connecting end, and a top of the shaft sleeve is connected to the output shaft.

[0011] Preferably, an annular groove is provided on the connecting end of the outer side of the sleeve, and a sealing ring is embedded in the annular groove.

[0012] Preferably, anti-rotation blocks are arranged around the sealing ring, and anti-rotation grooves matching with the anti-rotation blocks are evenly opened inside the annular groove.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows: the rotary pneumatic actuator is equipped with an actuator body, a first air port, a piston, a movable block, a rack, a gear, an output shaft, a limit sleeve, a return spring, a pressure column, a limit groove and a limit block. Gas enters the actuator body through the first air port, generates a thrust on the piston, causing the piston to move to both sides. The piston squeezes the pressure column, causing it to squeeze the return spring in the limit sleeve, and at the same time drives the movable block and the rack to move, thereby driving the gear and the output shaft to rotate counterclockwise to output torque. When ventilation stops, the pressure on the piston disappears, and the piston approaches each other under the action of the return spring, driving the gear and the output shaft to rotate and reset. When the return spring is squeezed and stretched, the limit blocks on both sides of the pressure column slide in the limit groove, limiting the movable range of the return spring, making it less likely to twist and deviate, thereby extending the service life of the pneumatic actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the top cross-sectional structure of the utility model;

[0016] Figure 2 For the utility model Figure 1 The enlarged structural diagram at A in the middle;

[0017] Figure 3 For the utility model Figure 1 The enlarged structural diagram at B in the middle;

[0018] Figure 4This is a front view of the structure of the utility model;

[0019] Figure 5 It is a schematic diagram of the structure of the utility model when viewed from above.

[0020] In the figure: 1. actuator body; 2. piston; 3. movable block; 4. rack; 5. gear; 6. limit sleeve; 7. air duct; 8. output shaft; 9. second air port; 10. first air port; 11. pressure column; 12. limit block; 13. return spring; 14. limit groove; 15. sealing sleeve; 16. rubber protrusion; 17. connecting end; 18. annular groove; 19. mounting hole; 20. sleeve; 21. stop block; 22. sealing ring. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-5 The utility model provides an embodiment: a rotary pneumatic actuator, comprising an actuator body 1, a piston 2, a gear 5 and an output shaft 8, wherein the gear 5 is arranged at the central position inside the actuator body 1, and the output shaft 8 runs through the central position of the gear 5;

[0023] A connection end 17 is provided at the central position of the bottom of the actuator body 1, and mounting holes 19 are evenly provided at the edge of the bottom of the connection end 17, and the actuator body 1 is connected to the valve body through the mounting holes 19 on the connection end 17;

[0024] A shaft sleeve 20 is provided at the central position of the connection end 17, and the top of the shaft sleeve 20 is connected to the output shaft 8, and the top of the valve stem is connected to the shaft sleeve 20;

[0025] An annular groove 18 is formed on the connecting end 17 outside the sleeve 20, and a sealing ring 22 is embedded inside the annular groove 18, which is beneficial to increase the tightness of the actuator body 1 and the valve body after connection;

[0026] The sealing ring 22 is surrounded by anti-rotation blocks 21, and the annular groove 18 is evenly provided with anti-rotation grooves matching the anti-rotation blocks 21, so that the sealing ring 22 is not easy to rotate relative to the ring 22;

[0027] Movable blocks 3 are provided on both sides of the gear 5, pistons 2 are provided on both sides of the actuator body 1, and one side of the piston 2 is connected to the movable blocks 3;

[0028] The top of one side of the actuator body 1 is respectively provided with a first air port 10 and a second air port 9, and both ends of both sides of the actuator body 1 are provided with a limit sleeve 6, and the inside of the limit sleeve 6 is provided with a pressure column 11 through a return spring 13, and one end of the pressure column 11 is connected to the piston 2;

[0029] During operation, gas enters the actuator body 1 through the first gas port 10, generating thrust on the piston 2, causing the piston 2 to move to both sides, and the piston 2 squeezes the pressure column 11, causing it to squeeze the return spring 13 in the limiting sleeve 6;

[0030] The movable blocks 3 are symmetrically distributed about the gear 5, and a rack 4 is provided on one side of the movable blocks 3 close to the gear 5;

[0031] When the piston 2 moves to both sides, the movable block 3 and the rack 4 move, thereby driving the gear 5 and the output shaft 8 to rotate counterclockwise to output torque, driving the valve stem to rotate and open the valve;

[0032] An air passage 7 is provided on one side of the actuator body 1, and the air passage 7 is connected to the second air port 9, and the air on both sides of the piston 2 is discharged from the second air port 9 through the air passage 7;

[0033] When ventilation stops, the pressure on the piston 2 disappears, and the pistons 2 move closer to each other under the action of the return spring 13, driving the gear 5 and the output shaft 8 to rotate and reset, driving the valve to close, and the air on both sides of the piston 2 is discharged from the first air port 10;

[0034] Limit blocks 12 are provided on both sides of one end of the pressure column 11, and limit grooves 14 matching the limit blocks 12 are provided on both sides of the interior of the limit sleeve 6;

[0035] When the return spring 13 is squeezed and stretched, the limit blocks 12 on both sides of the pressure column 11 slide in the limit groove 14, limiting the range of motion of the return spring 13, making it less likely to be twisted and offset, thereby extending the service life of the actuator body 1;

[0036] The first air port 10 and the second air port 9 are both provided with sealing sleeves 15 on their outer sides, and rubber protrusions 16 are evenly distributed on the inner side wall of the sealing sleeve 15, so that the air pipe has increased sealing performance when connecting the first air port 10 and the second air port 9, and is not prone to leakage.

[0037] Working principle: When the embodiment of the present application is in use, the actuator body 1 is connected to the valve body through the mounting hole 19 on the connecting end 17, the top of the valve stem is connected to the shaft sleeve 20, and an annular groove 18 is provided on the connecting end 17, in which a sealing ring 22 is embedded, which is beneficial to increase the tightness after the connection. During operation, the gas enters the actuator body 1 through the first air port 10, and generates a thrust on the piston 2, causing the piston 2 to move to both sides. The piston 2 squeezes the pressure column 11, causing it to squeeze the reset spring 13 in the limiting sleeve 6. At the same time, the piston 2 drives the movable block 3 and the rack 4 to move, thereby driving the gear 5 and the output shaft 8 to rotate counterclockwise to output torque, driving the valve stem to rotate to open the valve, and the air on both sides of the piston 2 is discharged from the second air port 9 through the air channel 7. When ventilation stops, the pressure on the piston 2 disappears, and the pistons 2 approach each other under the action of the return spring 13, driving the gear 5 and the output shaft 8 to rotate and reset, driving the valve to close, and the air on both sides of the piston 2 is discharged from the first air port 10. When the return spring 13 is squeezed and stretched, the limit blocks 12 on both sides of the pressure column 11 slide in the limit groove 14, limiting the range of movement of the return spring 13, making it less likely to twist and deflect, thereby extending the service life of the actuator body 1. In addition, a sealing sleeve 15 is provided on the outside of the first air port 10 and the second air port 9, and rubber protrusions 16 are evenly distributed inside the sealing sleeve 15, so that the air pipe increases the sealing when connecting the first air port 10 and the second air port 9, and is less likely to leak.

[0038] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

Claims

1. A rotary pneumatic actuator, characterized in that: The actuator comprises an actuator body (1), a piston (2), a gear (5) and an output shaft (8), wherein the gear (5) is arranged at a central position inside the actuator body (1), and the output shaft (8) passes through the central position of the gear (5), movable blocks (3) are arranged on both sides of the gear (5), pistons (2) are arranged on both sides inside the actuator body (1), and one side of the piston (2) is connected to the movable block (3), and both ends of the two sides inside the actuator body (1) are arranged A limit sleeve (6) is provided, and a pressure column (11) is provided inside the limit sleeve (6) via a return spring (13), one end of the pressure column (11) is connected to the piston (2), and limit blocks (12) are provided on both sides of one end of the pressure column (11), and limit grooves (14) matching the limit blocks (12) are provided on both sides of the limit sleeve (6), and a first air port (10) and a second air port (9) are provided at the top end of one side of the actuator body (1).

2. A rotary pneumatic actuator according to claim 1, characterized in that: A connection end (17) is provided at the central position of the bottom of the actuator body (1), and mounting holes (19) are evenly provided at the edge of the bottom of the connection end (17).

3. A rotary pneumatic actuator according to claim 1, characterized in that: An air passage (7) is provided on one side of the actuator body (1), and the air passage (7) is connected to the second air port (9).

4. A rotary pneumatic actuator according to claim 1, characterized in that: The movable blocks (3) are distributed in a centrally symmetrical manner with respect to the gear (5), and a rack (4) is provided on one side of the movable block (3) close to the gear (5).

5. A rotary pneumatic actuator according to claim 1, characterized in that: The outer sides of the first air port (10) and the second air port (9) are both provided with sealing sleeves (15), and the inner side walls of the sealing sleeves (15) are evenly distributed with rubber protrusions (16).

6. A rotary pneumatic actuator according to claim 2, characterized in that: A shaft sleeve (20) is provided at the central position of the connecting end (17), and the top of the shaft sleeve (20) is connected to the output shaft (8).

7. A rotary pneumatic actuator according to claim 6, characterized in that: An annular groove (18) is provided on the connecting end (17) outside the shaft sleeve (20), and a sealing ring (22) is embedded inside the annular groove (18).

8. A rotary pneumatic actuator according to claim 7, characterized in that: The sealing ring (22) is provided with anti-rotation blocks (21) around its periphery, and the annular groove (18) is evenly provided with anti-rotation grooves matching the anti-rotation blocks (21).

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