Pneumatic actuator

Abstract

The utility model discloses a pneumatic actuator which comprises end cover fastening screws, the end cover fastening screws are connected to end covers in a threaded mode, the end covers are fixedly connected to the two sides of a cylinder body, an indicator is arranged on the upper surface of the cylinder body, the lower surface of the indicator is fixedly connected to a shaft, spring mechanisms are arranged on the back faces of the end covers, and the spring mechanisms are arranged on the back faces of the end covers. The rear end of the spring mechanism is fixedly connected to the piston mechanism, the rear end of the piston mechanism is fixedly connected to the bottom end of the transmission mechanism, a dart-shaped gear is arranged to be matched with the connecting rod, the transition rod and the base, so that mechanical contact between components is reduced when the device operates, and the problem of gear abrasion is solved; meanwhile, the service life of the device is also prolonged; and the elastic force of the device is improved in a manner of additionally arranging a plurality of spring groups behind the end cover.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic actuators, in particular to a pneumatic actuator. 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 are valve positioners and handwheel mechanisms. The function of the valve positioner is to use the feedback principle to improve the performance of the actuator so that the actuator can be accurately positioned according to the controller. The function of the handwheel mechanism is to directly manipulate the control valve when the control system fails due to power outages, gas outages, no output of the controller or failure of the actuator to maintain normal production.

[0003] After searching, the applicant found that a Chinese patent disclosed "a pneumatic actuator", and its publication number is "CN116480830A". The patent mainly discloses a pneumatic actuator, which includes a cylinder body, an output gear shaft and two groups of pneumatic transmission components, wherein: the cylinder body is provided with an air inlet and an air outlet connected to the inside of the cylinder body; the output gear shaft is rotatably mounted in the middle of the cylinder body, and a driving gear is mounted on the output gear shaft, one end of the output gear shaft extends to the outside of the cylinder body and is used to connect the valve; the two groups of pneumatic transmission components are both arranged in the cylinder body and are symmetrically arranged about the axis center of the output gear shaft, the pneumatic transmission component includes a piston, a return spring, a transmission rack and a torque-increasing gear, and the piston is slidably mounted in the cylinder body. The present invention can not only increase the torque provided to the output gear shaft, making the valve opening process smoother, but also reduce the overall volume of the pneumatic actuator and reduce the installation space of the pneumatic actuator.

[0004] However, when the device is working, the pressure in the cylinder increases, which will cause serious wear of the gears, thus affecting the service life of the device. At the same time, the device has fewer spring groups and cannot provide sufficient elastic force to reset the piston. Utility Model Content

[0005] The purpose of the utility model is to provide a pneumatic actuator to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, a pneumatic actuator is provided, comprising an end cover fastening screw, the end cover fastening screw is threadedly connected to the end cover, the end cover is fixedly connected to both sides of the cylinder body, an indicator is provided on the upper surface of the cylinder body, the lower surface of the indicator is fixedly connected to the shaft, a spring mechanism is provided on the back side of the end cover, the rear end of the spring mechanism is fixedly connected to the piston mechanism, and the rear end of the piston mechanism is fixedly connected to the bottom end of the transmission mechanism.

[0007] Preferably, the spring mechanism consists of a left spring sleeve, a spring, and a right spring sleeve. The left spring sleeve is fixedly connected to the back of the end cover, the bottom end of the spring is fixedly connected to the left spring sleeve, the top end of the spring is fixedly connected to the right spring sleeve, and the top of the right spring sleeve is fixedly connected to the bottom end of the piston mechanism.

[0008] Preferably, the piston mechanism consists of a piston guide plate, a piston O-ring and a piston support ring, the piston guide plate is fixedly connected to the top end of the right spring sleeve, the piston guide plate is connected to the piston O-ring, and the piston O-ring is connected to the piston support ring.

[0009] Preferably, the transmission mechanism consists of a base, a transition rod, a connecting rod, transmission teeth, and a transmission interface groove. The base is fixedly connected to the top of the piston support ring, and the base is fixedly connected to the bottom of the transition rod. The top end of the transition rod is fixedly connected to the connecting rod, the front end of the connecting rod is embedded in the transmission interface groove, and the transmission interface groove is fixedly connected to the side of the transmission tooth.

[0010] Preferably, the surface of the cylinder body is provided with accessory mounting holes, air inlet holes and air outlet holes, the accessory mounting holes are symmetrically distributed in opposite directions on the surface of the cylinder body, and the air inlet holes and air outlet holes 7 are symmetrically distributed on the surface of the cylinder body.

[0011] Preferably, an adjusting screw is connected to the surface of the cylinder body, an adjusting nut is threadedly connected to the adjusting screw, an adjusting screw O-ring is arranged below the adjusting nut, and a cam is connected to the bottom of the adjusting screw.

[0012] Preferably, the cam is fixedly connected to the outer surface of the shaft, the outer surface of the shaft is fixedly connected with a transmission tooth, and the lower end of the shaft is fixedly connected with a bottom accessory interface.

[0013] In summary, the present application includes the following beneficial technical effects: by setting a dart-shaped gear in combination with a connecting rod, a transition rod, and a base, there is not much mechanical contact on the gear when the device is running, thereby reducing the problem of gear wear and extending the service life of the device; the elastic force of the device is improved by setting several more spring groups behind the end cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a front view of a pneumatic actuator of the utility model;

[0015] Figure 2 This is a front sectional view of a pneumatic actuator of the utility model;

[0016] Figure 3 This is an internal view of a pneumatic actuator of the utility model;

[0017] Figure 4 This is a side view of a pneumatic actuator of the utility model;

[0018] Figure 5 It is a partial schematic diagram of an adjusting screw of a pneumatic actuator of the utility model;

[0019] Figure 6 It is a partial schematic diagram of a transmission tooth of a pneumatic actuator of the utility model.

[0020] The symbols in the figure are:

[0021] 1. End cover fastening screws; 2. End cover; 3. Indicator; 4. Adjusting screw; 5. Accessory installation; 6. Air inlet; 7. Air outlet; 8. Cylinder body; 9. Spring sleeve left; 10. Spring sleeve right; 11. Spring; 12. Piston guide plate; 13. Piston O-ring; 14. Piston support ring; 15. Shaft; 16. Cam; 17. Bottom accessory interface; 18. Base; 19. Connecting rod; 20. Transmission gear; 21. Transmission interface groove; 22. Adjusting nut; 23. Adjusting screw O-ring; 24. Transition rod. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0023] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention; the terms "first", "second" and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Reference Figures 1 to 6The utility model embodiment is a pneumatic actuator, including an end cover fastening screw 1, the end cover fastening screw 1 is threadedly connected to the end cover 2, the end cover 2 is fixedly connected to both sides of the cylinder body 8, the upper surface of the cylinder body 8 is provided with an indicator 3, the lower surface of the indicator 3 is fixedly connected to the shaft 15, the back of the end cover 2 is provided with a spring mechanism, the rear end of the spring mechanism is fixedly connected to the piston mechanism, the rear end of the piston mechanism is fixedly connected to the bottom end of the transmission mechanism, the end cover 2 and the cylinder body 8 are connected together by screwing the end cover fastening screw 1 into the corresponding threaded holes on the end cover 2 and the cylinder body 8, and the end cover 2 is symmetrically distributed with respect to the shaft 15. The end cover 2 protrudes in the middle part because it provides space for expanding multiple groups of spring groups inside the device. When the device is working, the end covers 2 on both sides are in a compressed state.

[0025] The spring mechanism consists of a left spring sleeve 9, a spring 11, and a right spring sleeve 10. The left spring sleeve 9 is fixedly connected to the back of the end cover 2 and embedded in the slot on the end cover 2. The bottom end of the spring 11 is fixedly connected to the left spring sleeve 9, the top end of the spring 11 is fixedly connected to the right spring sleeve 10, and the top of the right spring sleeve 10 is fixedly connected to the bottom end of the piston mechanism. When the device is operating, the right spring sleeve 10 is subjected to force, which causes the right spring sleeve 10 to move forward or backward. The backward movement of the right spring sleeve 10 shortens the compression process of the spring 11. When the elastic force provided by the spring 11 is greater than the pressure in the cylinder 8, the spring 11 begins to reset.

[0026] The piston mechanism is composed of a piston guide plate 12, a piston O-ring 13 and a piston support ring 14. The piston guide plate 12 is fixedly connected to the top end of the spring sleeve 10, and the piston guide plate 12 is connected to the piston O-ring 13. The piston O-ring 13 is connected to the piston support ring 14. The mechanism is made of piston guide plate 12-piston O-ring 13-piston guide plate 12-piston O-ring 13-piston support ring 14. The piston is successively provided with two layers of rubber rings.

[0027] The transmission mechanism consists of a base 18, a transition rod 24, a connecting rod 19, a transmission tooth 20, and a transmission interface groove 21. The base 18 is fixedly connected to the top of the piston support ring 14, and the base 18 is fixedly connected to the bottom of the transition rod 24. The top of the transition rod 24 is fixedly connected to the connecting rod 19. The front end of the connecting rod 19 is embedded in the transmission interface groove 21. The transmission interface groove 21 is fixedly connected to the side of the transmission tooth 20. The transmission tooth 20 is fixedly connected to the outer surface of the shaft 15. The transmission mechanism is distributed one above and one below. There are two transmission mechanisms in total for maintaining the operation of the device.

[0028] The surface of the cylinder body 8 is provided with an accessory mounting hole 5, an air inlet hole 6 and an air outlet hole 7. The accessory mounting hole 5 is symmetrically distributed in opposite directions on the surface of the cylinder body 8. The air inlet hole 6 and the air outlet hole 7 are symmetrically distributed on the surface of the cylinder body 8. In order to ensure the normal operation of the air inlet hole 6, the air outlet hole 7 and the accessory mounting hole 5, the lower half of the front view surface of the cylinder body 8 is specially protruded. An adjusting screw 4 is connected to the surface of the cylinder body 8. An adjusting nut 22 is threadedly connected to the adjusting screw 4. An adjusting screw O-ring 23 is provided below the adjusting nut 22. A cam 16 is connected to the bottom of the adjusting screw 4. The cam 16 is fixedly connected to the outer surface of the shaft 15. The outer surface of the shaft 15 is fixedly connected with a transmission tooth 20, and the lower end of the shaft 15 is fixedly connected with a bottom accessory interface 17, and the rotation of the cam 16 will drive the component fixed to the outer surface of the shaft 15 to move. Working principle: When using the device, gas flows into the cylinder through the air inlet hole. With the continuous influx of gas, the pressure in the cylinder becomes larger and larger. When the gas flowing into the cylinder reaches a certain value, the pressure in the cylinder is greater than the elastic force provided by the spring group. At this time, the spring process will be compressed, but because the front end of the spring is fixedly connected to the piston guide plate, the piston mechanism will also be pulled toward the end cover while the spring process contracts. Since the front end of the piston mechanism is fixedly connected to the base of the rotating mechanism, when the spring process contracts, not only the piston mechanism will be driven to contract, but also the transmission mechanism fixedly connected to the piston mechanism will be driven to contract, thereby causing the transmission teeth to rotate to drive the operation of the accessory structure. When it is necessary to end the operation of the accessory structure, only the gas needs to be released from the air outlet, which makes the pressure in the cylinder gradually decrease. The spring begins to gradually resume the process under the action of the elastic force, which pushes the piston mechanism forward. Since the front end of the piston mechanism is fixedly connected to the bottom of the transmission mechanism, the transmission mechanism is driven, thereby causing the transmission teeth to rotate to end the operation of the accessory.

[0029] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pneumatic actuator, characterized in that: The pneumatic actuator comprises an end cover fastening screw (1), wherein the end cover fastening screw (1) is threadedly connected to the end cover (2), the end cover (2) is fixedly connected to both sides of a cylinder body (8), the upper surface of the cylinder body (8) is provided with an indicator (3), the lower surface of the indicator (3) is fixedly connected to a shaft (15), and the back side of the end cover (2) is provided with a spring mechanism, the rear end of the spring mechanism is fixedly connected to a piston mechanism, and the rear end of the piston mechanism is fixedly connected to the bottom end of a transmission mechanism.

2. A pneumatic actuator according to claim 1, characterized in that: The spring mechanism is composed of a left spring sleeve (9), a spring (11), and a right spring sleeve (10); the left spring sleeve (9) is fixedly connected to the back of the end cover (2); the bottom end of the spring (11) is fixedly connected to the left spring sleeve (9); the top end of the spring (11) is fixedly connected to the right spring sleeve (10); and the top of the right spring sleeve (10) is fixedly connected to the bottom end of the piston mechanism.

3. A pneumatic actuator according to claim 2, characterized in that: The piston mechanism is composed of a piston guide plate (12), a piston O-ring (13) and a piston support ring (14); the piston guide plate (12) is fixedly connected to the top end of the spring sleeve (10), the piston guide plate (12) is connected to the piston O-ring (13), and the piston O-ring (13) is connected to the piston support ring (14).

4. A pneumatic actuator according to claim 3, characterized in that: The transmission mechanism consists of a base (18), a transition rod (24), a connecting rod (19), a transmission tooth (20), and a transmission interface groove (21); the base (18) is fixedly connected to the top of the piston support ring (14), and the base (18) is fixedly connected to the bottom of the transition rod (24); the top of the transition rod (24) is fixedly connected to the connecting rod (19); the front end of the connecting rod (19) is embedded in the transmission interface groove (21), and the transmission interface groove (21) is fixedly connected to the side of the transmission tooth (20).

5. A pneumatic actuator according to claim 4, characterized in that: The surface of the cylinder body (8) is provided with an accessory mounting hole (5), an air inlet hole (6), and an air outlet hole (7); the accessory mounting hole (5) is symmetrically distributed in opposite directions on the surface of the cylinder body (8); and the air inlet hole (6) and the air outlet hole (7) are symmetrically distributed on the surface of the cylinder body (8).

6. A pneumatic actuator according to claim 5, characterized in that: An adjusting screw (4) is connected to the surface of the cylinder body (8), an adjusting nut (22) is threadedly connected to the adjusting screw (4), an adjusting screw O-ring (23) is arranged below the adjusting nut (22), and a cam (16) is connected to the bottom of the adjusting screw (4).

7. A pneumatic actuator according to claim 6, characterized in that: The cam (16) is fixedly connected to the outer surface of the shaft (15), the outer surface of the shaft (15) is fixedly connected with a transmission tooth (20), and the lower end of the shaft (15) is fixedly connected with a bottom accessory interface (17).

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