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CN-224214819-U - Pneumatic actuator

CN224214819UCN 224214819 UCN224214819 UCN 224214819UCN-224214819-U

Abstract

The utility model discloses a pneumatic execution device, which is internally provided with a first limit protection component and a second limit protection component, wherein when a piston body in the pneumatic execution device moves to an opening limit position and a closing limit position, an elastic buffer element is respectively introduced, so that rigid collision is converted into a controllable elastic buffer process, the peak value of impact force is obviously reduced, a precise part in the pneumatic execution device and an end cover connected with the precise part are prevented from being damaged, and the reliability and the service life of a system are finally improved.

Inventors

  • TIAN JUNBAO

Assignees

  • 深圳市海特科阀门和控制有限公司

Dates

Publication Date
20260508
Application Date
20250617

Claims (10)

  1. 1. A pneumatic actuator, comprising: The cylinder body comprises a first end cover and a second end cover, and a first through hole is formed in the middle of the first end cover; The piston body is arranged in the cylinder body, is connected with the inner wall of the cylinder body in a sealing way, and can axially move along the inner wall of the cylinder body; The piston body is provided with a first through hole, one end of the piston body is connected with the middle part of the piston body, the other end of the piston body extends out of the cylinder body through the first through hole, the piston body is connected with the inner wall of the first through hole in a sealing mode, and the piston body can drive the piston body to move along the axial direction of the cylinder body; The first limiting protection component is arranged in the middle of the inner wall of the first end cover, and a part of the pushing shaft penetrates through the second through hole; The first limit protection assembly comprises a first connecting seat, a bearing ring and an elastic ring body, wherein a containing cavity is formed in the first connecting seat, the bearing ring and the elastic ring body are stacked in the containing cavity, an abutting part is convexly arranged at one end of the pushing shaft, which is close to one end of the piston body, and the abutting part can penetrate through the second through hole and is abutted with the bearing ring; The second limiting protection component is arranged in the middle of the inner wall of the second end cover, and comprises an elastic contact end, wherein the elastic contact end corresponds to the end position of the pushing shaft, which is close to the second end cover, so that when the end of the pushing shaft moves to the elastic contact end, the elastic contact end can be abutted by the end of the pushing shaft and elastically contracts when being abutted.
  2. 2. The pneumatic actuator of claim 1, wherein the second limit guard assembly comprises: The end part of the second connecting seat is provided with a through groove, and the through groove can accommodate the end part of the pushing shaft to be inserted into the second connecting seat; The pressure bearing plate piece is arranged in the second connecting seat and can slide along the inner wall of the second connecting seat; The elastic piece is arranged in the second connecting seat, and the elastic force of the elastic piece can push the pressure-bearing plate piece towards the through groove, so that the outer side wall of the pressure-bearing plate piece is propped against the limiting ring part.
  3. 3. The pneumatic actuator of claim 1, wherein a first magnetic ring is disposed at an end of the first connecting seat, a second magnetic ring is disposed at an end of the piston body opposite the first connecting seat, the first magnetic ring is adapted to the second magnetic ring, and the first magnetic ring is magnetically repulsed from the second magnetic ring.
  4. 4. The pneumatic actuator of claim 2, wherein a third magnetic ring is disposed at an end of the second connecting seat, a fourth magnetic ring is disposed at an end of the piston body opposite the second connecting seat, and the third magnetic ring is adapted to the fourth magnetic ring.
  5. 5. The pneumatic actuator according to claim 1, wherein a third through hole for the push shaft to pass through is provided in the middle of the piston body, one end of the push shaft passes through the third through hole, the abutting portion abuts against one end of the third through hole, and the end of the push shaft is pre-fastened to the piston body by a nut so that the piston body is clamped between the abutting portion and the nut.
  6. 6. The pneumatic actuator of claim 1, wherein the cylinder comprises: The two ends of the cylinder barrel are respectively connected with the first end cover and the second end cover in a sealing way, and the outer diameters of the first end cover and the second end cover are larger than the outer diameter of the cylinder barrel; the first end cover and the second end cover are connected through the screws, so that the first end cover and the second end cover clamp the cylinder barrel, and the screws are located on the periphery of the cylinder barrel.
  7. 7. The pneumatic actuator of claim 6, wherein the first end cap has at least one first air tap and the second end cap has at least one second air tap, the first air tap and the second air tap being configured to be connected to an air pressure output device, respectively.
  8. 8. The pneumatic actuator of claim 5, wherein the inner ring of the first through hole is provided with at least one first ring groove, the at least one first ring groove is provided with a first sealing ring for sealing connection with the push shaft, the inner ring of the third through hole is provided with at least one second ring groove, the at least one second ring groove is provided with a second sealing ring, and the second sealing ring is used for sealing connection with the piston body.
  9. 9. The pneumatic actuator of claim 1, wherein the receiving cavity is recessed in a stepped manner in the middle of the first through hole, so that the elastic force of the elastic ring body can press the outer periphery of the receiving ring against the stepped inner wall of the receiving cavity, which is close to the first through hole, to limit the receiving ring from falling out.
  10. 10. The pneumatic actuator of claim 1, wherein the outer race of the first connector is provided with a step portion detachably connected to the first end cap by a plurality of screws.

Description

Pneumatic actuator Technical Field The utility model relates to the technical field of pneumatic execution mechanisms, in particular to a pneumatic execution device which is suitable for a valve control scene requiring quick opening and closing. Background In the field of modern industrial automation control, especially in the working conditions requiring fast response and emergency shut-off, the demands on the switching speed of the valve actuator are increasing. Many critical applications require that the valve achieve full stroke action in a very short time, for example, up to 3 seconds or even faster, and complete opening or closing within 1 second. Such high speed operation is critical to ensure process safety, reduce process fluctuations, or meet a particular process flow. However, high speed actuation of the valve actuator also presents significant challenges. When the valve moves rapidly to the full open or full closed limit position, the piston and the push shaft rigidly connected with the piston can carry huge kinetic energy to strike the end cover of the actuating mechanism. The rigid impact at high speed can generate strong instant impact force, so that key parts such as a piston, a push shaft, an end cover, a sealing element and the like in the pneumatic actuating mechanism can be damaged, such as deformation, abrasion and even fracture, and the impact force can be transmitted to the valve body through the push shaft, so that precise parts such as a valve core, a valve seat and a valve rod in the valve are damaged. The long-term operation under the high impact load can obviously shorten the service life of an actuating mechanism, increase the maintenance cost and the stop risk, and seriously cause potential safety hazards due to sudden failure of key components, thereby influencing the safe and reliable operation of the whole system. The current common solutions have focused on increasing the stiffness and strength of the actuator itself to withstand the impact, or providing a damping structure at the valve end. This tends to increase the complexity and cost of the system and has limited protection for moving parts within the actuator, especially with respect to the difficulty of effectively dispersing and absorbing the large impact energy generated by the high speed moving tips. Aiming at the problems existing in the prior art, particularly the vulnerable parts and potential safety hazards caused by the end impact of a high-speed actuating mechanism, a protection device which can be directly integrated in the actuating mechanism and can effectively absorb the end impact energy of the high-speed movement is needed. Disclosure of utility model The utility model aims to provide a pneumatic execution device, which is internally provided with a first limit protection component and a second limit protection component, wherein when a piston body in the pneumatic execution device moves to an opening limit position and a closing limit position, an elastic buffer element is respectively introduced, so that rigid collision is converted into a controllable elastic buffer process, the peak value of impact force is remarkably reduced, precise parts in the pneumatic execution device and an end cover connected with the precise parts are prevented from being damaged, and the reliability and the service life of a system are finally improved. To achieve the above object, a pneumatic actuator includes: The cylinder body comprises a first end cover and a second end cover, and a first through hole is formed in the middle of the first end cover; The piston body is arranged in the cylinder body, is connected with the inner wall of the cylinder body in a sealing way, and can axially move along the inner wall of the cylinder body; The piston body is provided with a first through hole, one end of the piston body is connected with the middle part of the piston body, the other end of the piston body extends out of the cylinder body through the first through hole, the piston body is connected with the inner wall of the first through hole in a sealing mode, and the piston body can drive the piston body to move along the axial direction of the cylinder body; The first limiting protection component is arranged in the middle of the inner wall of the first end cover, and a part of the pushing shaft penetrates through the second through hole; The first limit protection assembly comprises a first connecting seat, a bearing ring and an elastic ring body, wherein a containing cavity is formed in the first connecting seat, the bearing ring and the elastic ring body are stacked in the containing cavity, an abutting part is convexly arranged at one end of the pushing shaft, which is close to one end of the piston body, and the abutting part can penetrate through the second through hole and is abutted with the bearing ring; The second limiting protection component is arranged in the middle of the inner wall of the second end cover, and