Single-action pneumatic actuator

Abstract

The utility model discloses a single-action pneumatic actuator, which belongs to the technical field of pneumatic actuators, and solves the problems that the upper limit of bearing force of the conventional pneumatic actuator is limited, and even if the acting force is further increased after the acting force applied from the outside breaks through the upper limit of resistance, the damping effect of the pneumatic actuator is invalid, and the service life of the pneumatic actuator is prolonged. And a sufficient damping acting force range cannot be provided for the damper. Comprising a spring end cover, an annular cylinder body, a lower end cover, a hydraulic assembly, a pneumatic piston and a pneumatic piston rod, one end of the spring end cover is closed and the other end is open; the annular cylinder body is fixedly connected to the open end of the spring end cover; the lower end cover is fixedly connected to the side, away from the spring end cover, of the annular cylinder body and seals an opening of the annular cylinder body. The hydraulic assembly penetrates through the closed end of the spring end cover and extends into the spring end cover. The hydraulic assembly is arranged, the hydraulic oil amount is adjusted, adjustable damping is provided for displacement of the pneumatic actuator, acting force is prevented from exceeding the upper limit, and the lasting damping effect is achieved.

Description

Technical Field

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

[0002] Pneumatic actuators are an automation control element that uses compressed air as a power source. They are widely used in industrial automation, robotics and other fields. Its core component is a cylinder, which is equipped with a piston and a piston rod. By controlling the in and out of compressed air, the piston rod can achieve linear motion, rotational motion or swinging motion. The working principle of the pneumatic actuator is relatively simple. It transmits compressed air to the cylinder by connecting the air source and the pipeline system, and pushes the piston rod to perform the corresponding mechanical action. The advantages of this actuator are simple structure, low cost, fast response speed, and the ability to work stably in harsh industrial environments.

[0003] At present, pneumatic actuators mainly use air as a power source to drive the piston and piston rod to move in the cylinder, and also use air as a load for compression. When the piston and piston rod move in the opposite direction in the cylinder, they only need to overcome the resistance of the air passing through the piston to slide smoothly. However, the current pneumatic actuator has a limited upper load-bearing limit. After the external force exceeds the resistance limit, even if the force is further increased, the damping effect of the pneumatic actuator will fail, and it is impossible to provide a sufficient damping force range.

[0004] Therefore, a single-acting pneumatic actuator is proposed to solve or alleviate the above problems. Utility Model Content

[0005] The utility model aims to solve the shortcomings in the prior art and proposes a single-acting pneumatic actuator.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A single-acting pneumatic actuator comprises a spring end cover, an annular cylinder body, a lower end cover, a hydraulic assembly, a pneumatic piston, and a pneumatic piston rod;

[0008] The spring end cover has one end closed and the other end open;

[0009] The annular cylinder body is fixedly connected to the open end of the spring end cover;

[0010] The lower end cover is fixedly connected to the side of the annular cylinder away from the spring end cover and closes its opening;

[0011] The hydraulic assembly passes through the spring end cap and closes one end thereof;

[0012] The pneumatic piston is slidably connected in the annular cylinder;

[0013] The gas piston rod is fixedly connected in the pneumatic piston, and its two ends respectively penetrate the pneumatic piston and the lower end cover;

[0014] The gas piston rod is fixedly connected to the telescopic end of the hydraulic assembly via a connecting rod.

[0015] Preferably, a flange is fixedly connected to the open end of the spring end cover, the cross section of the flange is arranged to coincide with the cross section of the lower end cover, and the inner diameter of the annular cylinder body is between the inner diameter and the outer diameter of the flange.

[0016] Preferably, a through hole is formed on the lower end cover, and an annular tube communicating with the through hole is fixedly connected to a side of the lower end cover away from the annular cylinder body.

[0017] Preferably, an annular embedding groove is formed on the end surface of the flange and the end surface of the lower end cover, and both ends of the annular cylinder body are fixedly connected with embedding rings that can be embedded in the annular embedding groove, and a sealing ring is fixedly connected to the outer side of the embedding ring.

[0018] Preferably, the hydraulic assembly and the outer ring of the connecting rod are provided with a spring module, and the two ends of the spring module are respectively fixedly connected to the lower end cover and the inner bottom surface of the spring end cover.

[0019] Preferably, the hydraulic assembly includes a hydraulic cylinder body that passes through one end closed by a spring end cover, a hydraulic piston slidably connected in the hydraulic cylinder body, a hydraulic piston rod fixedly connected to the hydraulic piston and passing through the hydraulic cylinder body to the outside, and a chassis fixedly connected to the hydraulic cylinder body that passes through one end of the spring end cover to the outside, a hydraulic manual closing interface and a hydraulic manual opening interface that are connected to the hydraulic cylinder body are provided on the chassis, the hydraulic manual opening interface is connected to an oil guide pipe that is connected to the hydraulic cylinder body, and the end of the oil guide pipe that is away from the chassis is located between the hydraulic piston and the end of the hydraulic cylinder body that is away from the chassis.

[0020] Preferably, the hydraulic assembly also includes a hydraulic fluid tank, a reversing valve, and a hydraulic manual pump fixedly connected to one side of the spring end cover, the hydraulic fluid tank being connected to a hydraulic manual closing interface and a hydraulic manual opening interface through a pipeline, the reversing valve being connected to the pipeline between the hydraulic manual closing interface and the hydraulic manual opening interface, and the hydraulic manual pump being connected to the pipeline between the hydraulic fluid tank and the reversing valve.

[0021] Preferably, a plurality of tie rods are fixedly connected to the lower end cover, an outer circle of the tie rod away from the lower end cover is provided with an external thread, the flange is provided with holes for the tie rods to pass through, the tie rods are threadedly connected with connecting nuts via external threads, and the connecting nuts are arranged to press against the flange.

[0022] Preferably, an outer ring groove is formed on the outer ring of the pneumatic piston, and a sealing member is embedded in the outer ring groove.

[0023] Preferably, a bottom ring groove is provided on one side of the pneumatic piston facing the lower end cover, a buffer ring is fixedly connected in the bottom ring groove, and the thickness of the buffer ring is greater than the groove depth of the bottom ring groove.

[0024] The utility model has the following beneficial effects:

[0025] The utility model provides damping for the displacement of the gas piston rod and the pneumatic piston by setting a hydraulic component, and adjusts the damping force according to the change of the hydraulic oil amount in the hydraulic component. When the pneumatic actuator is subjected to external force, the force cannot exceed the upper limit of the damping force, so that the pneumatic actuator can maintain the damping effect for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the utility model;

[0027] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0028] 1. Spring end cover; 2. Flange; 3. Annular cylinder body; 4. Lower end cover; 5. Pull rod; 6. Connecting nut; 7. Sealing sleeve; 8. Sealing cylinder; 9. Pneumatic piston; 10. Pneumatic piston rod; 11. Buffer ring; 12. Seal; 13. Hydraulic piston rod; 14. Hydraulic cylinder body; 15. Oil guide pipe; 16. Hydraulic manual closing interface; 17. Hydraulic manual opening interface; 18. Spring module; 19. Hydraulic fluid tank; 20. Hydraulic manual pump; 21. Reversing valve; 22. Embedded ring; 23. Sealing ring; 24. Annular groove; 25. Annular pipe. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0030] A single-acting pneumatic actuator, such as Figure 1 As shown, it includes a spring end cover 1, an annular cylinder body 3, a lower end cover 4, a hydraulic assembly, a pneumatic piston 9, and a pneumatic piston rod 10;

[0031] The spring end cover 1 is closed at one end and open at the other end;

[0032] The annular cylinder body 3 is fixedly connected to the open end of the spring end cover 1;

[0033] The lower end cover 4 is fixedly connected to the side of the annular cylinder body 3 away from the spring end cover 1 and closes its opening. A through hole is opened on the lower end cover 4. The side of the lower end cover 4 away from the annular cylinder body 3 is fixedly connected to a ring pipe 25 connected to the through hole.

[0034] The hydraulic assembly passes through the spring end cap 1 and closes one end thereof;

[0035] The pneumatic piston 9 is slidably connected in the annular cylinder body 3. The outer ring of the pneumatic piston 9 is provided with an outer ring groove, and a seal 12 is embedded in the outer ring groove. The pneumatic piston 9 is provided with a bottom ring groove on one side facing the lower end cover 4. A buffer ring 11 is fixedly connected in the bottom ring groove. The thickness of the buffer ring 11 is greater than the groove depth of the bottom ring groove.

[0036] The gas piston rod 10 is fixedly connected in the gas piston 9, and its two ends penetrate the gas piston 9 and the lower end cover 4 respectively;

[0037] The gas piston rod 10 is fixedly connected to the telescopic end of the hydraulic assembly via a connecting rod.

[0038] like Figure 2 As shown, the open end of the spring end cover 1 is fixedly connected with a flange 2, the cross section of the flange 2 is arranged to coincide with the cross section of the lower end cover 4, the inner diameter of the annular cylinder body 3 is between the inner diameter and the outer diameter of the flange 2, and annular embedding grooves 24 are provided on the end surfaces of the flange 2 and the lower end cover 4, and both ends of the annular cylinder body 3 are fixedly connected with embedding rings 22 that can be embedded in the annular embedding grooves 24, and the outer side of the embedding ring 22 is fixedly connected with a sealing ring 23, and a plurality of tie rods 5 are fixedly connected to the lower end cover 4, and the outer ring of the tie rod 5 away from the lower end cover 4 is provided with an external thread, and a hole for the tie rod 5 to pass through is provided on the flange 2, and a connecting nut 6 is threadedly connected to the tie rod 5 through an external thread, and the connecting nut 6 is set to press the flange 2.

[0039] The outer ring of the hydraulic assembly and the connecting rod is provided with a spring module 18, and the two ends of the spring module 18 are respectively fixedly connected to the lower end cover 4 and the inner bottom surface of the spring end cover 1. The hydraulic assembly includes a hydraulic cylinder body 14 that passes through the closed end of the spring end cover 1, a hydraulic piston slidably connected in the hydraulic cylinder body 14, a hydraulic piston rod 13 fixedly connected to the hydraulic piston and passing through the hydraulic cylinder body 14 to the outside, a chassis fixedly connected to the hydraulic cylinder body 14 and passing through the spring end cover 1 to one end of the outside, a hydraulic liquid tank 19 fixedly connected to one side of the spring end cover 1, a reversing valve 21, and a hydraulic manual pump 20, and an opening on the chassis. A hydraulic manual closing interface 16 and a hydraulic manual opening interface 17 connected to the hydraulic cylinder body 14 are provided. The hydraulic manual opening interface 17 is connected to an oil guide pipe 15 connected to the hydraulic cylinder body 14. The end of the oil guide pipe 15 away from the chassis is located between the hydraulic piston and the end of the hydraulic cylinder body 14 away from the chassis. The hydraulic liquid tank 19 is connected to the hydraulic manual closing interface 16 and the hydraulic manual opening interface 17 through a pipeline. The reversing valve 21 is connected to the pipeline between the hydraulic manual closing interface 16 and the hydraulic manual opening interface 17, and the hydraulic manual pump 20 is connected to the pipeline between the hydraulic liquid tank 19 and the reversing valve 21.

[0040] The utility model provides a stable damping effect for the movement of the pneumatic piston rod 10 and the pneumatic piston 9 by introducing a hydraulic component. The change in the amount of oil in the hydraulic component allows fine adjustment of the damping force. When the pneumatic actuator encounters an external force, the force is limited to the threshold set by the damping force, ensuring that the actuator can continuously maintain the required damping performance.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A single-acting pneumatic actuator, characterized in that: It comprises a spring end cover (1), an annular cylinder body (3), a lower end cover (4), a hydraulic assembly, a pneumatic piston (9), and a pneumatic piston rod (10); The spring end cover (1) has one end closed and the other end open; The annular cylinder body (3) is fixedly connected to the open end of the spring end cover (1); The lower end cover (4) is fixedly connected to a side of the annular cylinder body (3) away from the spring end cover (1) and closes its opening; The hydraulic assembly passes through the spring end cover (1) and closes one end thereof; The pneumatic piston (9) is slidably connected in the annular cylinder body (3); The gas piston rod (10) is fixedly connected in the pneumatic piston (9), and its two ends respectively penetrate the pneumatic piston (9) and the lower end cover (4); The gas piston rod (10) is fixedly connected to the telescopic end of the hydraulic assembly via a connecting rod.

2. A single-acting pneumatic actuator according to claim 1, characterized in that: The open end of the spring end cover (1) is fixedly connected to a flange (2), the cross section of the flange (2) is arranged to coincide with the cross section of the lower end cover (4), and the inner diameter of the annular cylinder body (3) is between the inner diameter and the outer diameter of the flange (2).

3. A single-acting pneumatic actuator according to claim 2, characterized in that: The lower end cover (4) is provided with a through hole, and a ring pipe (25) communicating with the through hole is fixedly connected to the side of the lower end cover (4) away from the annular cylinder body (3).

4. A single-acting pneumatic actuator according to claim 2, characterized in that: An annular embedding groove (24) is provided on the end surface of the flange (2) and the end surface of the lower end cover (4), and an embedding ring (22) which can be embedded in the annular embedding groove (24) is fixedly connected to both ends of the annular cylinder body (3), and a sealing ring (23) is fixedly connected to the outer side of the embedding ring (22).

5. A single-acting pneumatic actuator according to claim 4, characterized in that: The hydraulic assembly and the outer ring of the connecting rod are provided with a spring module (18), and the two ends of the spring module (18) are respectively fixedly connected to the lower end cover (4) and the inner bottom surface of the spring end cover (1).

6. A single-acting pneumatic actuator according to claim 5, characterized in that: The hydraulic assembly comprises a hydraulic cylinder body (14) which passes through a closed end of a spring end cover (1), a hydraulic piston slidably connected in the hydraulic cylinder body (14), a hydraulic piston rod (13) fixedly connected to the hydraulic piston and passing through the hydraulic cylinder body (14) to the outside, and a chassis fixedly connected to the hydraulic cylinder body (14) and passing through the spring end cover (1) to one end of the outside. The chassis is provided with a hydraulic manual closing interface (16) and a hydraulic manual opening interface (17) which are connected to the inside of the hydraulic cylinder body (14). The hydraulic manual opening interface (17) is connected to an oil guide pipe (15) which is connected to the hydraulic cylinder body (14). The end of the oil guide pipe (15) which is away from the chassis is located between the hydraulic piston and the end of the hydraulic cylinder body (14) which is away from the chassis.

7. A single-acting pneumatic actuator according to claim 6, characterized in that: The hydraulic assembly further comprises a hydraulic fluid tank (19) fixedly connected to one side of the spring end cover (1), a reversing valve (21), and a hydraulic manual pump (20); the hydraulic fluid tank (19) is connected to a hydraulic manual closing interface (16) and a hydraulic manual opening interface (17) via a pipeline; the reversing valve (21) is connected to the pipeline between the hydraulic manual closing interface (16) and the hydraulic manual opening interface (17); and the hydraulic manual pump (20) is connected to the pipeline between the hydraulic fluid tank (19) and the reversing valve (21).

8. A single-acting pneumatic actuator according to claim 2, characterized in that: A plurality of tie rods (5) are fixedly connected to the lower end cover (4), and an outer ring of the end of the tie rod (5) away from the lower end cover (4) is provided with an external thread. The flange (2) is provided with a hole for the tie rod (5) to pass through. The tie rod (5) is threadedly connected with a connecting nut (6) via an external thread, and the connecting nut (6) is arranged to press against the flange (2).

9. A single-acting pneumatic actuator according to claim 1, characterized in that: The outer ring of the pneumatic piston (9) is provided with an outer ring groove, and a sealing member (12) is embedded in the outer ring groove.

10. A single-acting pneumatic actuator according to claim 1, characterized in that: A bottom ring groove is formed on one side of the pneumatic piston (9) facing the lower end cover (4), a buffer ring (11) is fixedly connected in the bottom ring groove, and the thickness of the buffer ring (11) is greater than the groove depth of the bottom ring groove.

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