CN210423914U

CN210423914U - Pneumatic actuating mechanism

Info

Publication number: CN210423914U
Application number: CN201921037132.6U
Authority: CN
Inventors: 何楚天; 陈超; 陈君
Original assignee: Wuxi Aishengtuoke Fluid Control Co ltd
Current assignee: Wuxi Aishengtuoke Fluid Control Co ltd
Priority date: 2019-07-04
Filing date: 2019-07-04
Publication date: 2020-04-28
Anticipated expiration: 2029-07-04

Abstract

The utility model relates to a pneumatic actuator belongs to pneumatic control technical field. The air compressor comprises an end cover, a piston, a cylinder body, a first air chamber, a second air chamber and a driving shaft; the middle of the cylinder body is provided with a driving shaft, and the cylinder body is symmetrical left and right by taking the driving shaft as a center; end covers are arranged at two ends of the cylinder body, and a piston is arranged between each end cover and the driving shaft; the space between the piston and the driving shaft is a first air chamber, and the space between the piston and the end cover is a second air chamber; the device also comprises a boss; the tail end of the end cover is provided with a boss; the boss can contact with the bottom of the flange of the piston. The utility model discloses the structure has broken away from traditional pneumatic actuator and has installed limit screw on the end cover, through the instability of nut and tight structure, has proposed spacing thinking again, and it is little to current pneumatic actuator structural change, repacking low cost does not influence current production line.

Description

Pneumatic actuating mechanism

Technical Field

The utility model relates to a pneumatic actuator, concretely relates to prevent pneumatic actuator who takes off tooth belongs to pneumatic control technical field.

Background

The pneumatic actuator is an actuating device for opening and closing or regulating a valve by air pressure, is also called a pneumatic actuating mechanism or a pneumatic device, but is generally called a pneumatic head. Pneumatic actuators are sometimes also equipped with certain auxiliary devices. Commonly used valve positioners and hand wheel mechanisms. The valve positioner is used for improving the performance of the actuator by utilizing a feedback principle, so that the actuator can realize accurate positioning according to a control signal of the controller. The hand wheel mechanism is used for directly operating the control valve to maintain normal production when the control system has no power supply, no air supply, no output of the controller or failure of the actuating mechanism.

The pneumatic actuator pushes the piston to move towards two ends of the cylinder body through the pressure of the air source in the air chamber, and the driving shaft starts to rotate under the meshing action of the rack of the piston and the gear of the driving shaft; if the driving shaft needs to rotate in the opposite direction, the piston is pushed by the air source pressure in the other air chamber to move towards the middle of the cylinder body, and the driving shaft starts to rotate under the meshing action of the rack of the piston and the gear of the driving shaft.

Under the condition that the pneumatic actuator acts for a long time or the opening of the pneumatic actuator is adjusted by people to be wrong, the situation that the piston moves towards the two ends of the cylinder body without limitation under the pushing of the air source pressure in the air chamber can occur, and if the two ends of the cylinder body are not provided with the limiting mechanisms, the situation that the piston is meshed with the driving shaft and is disengaged from the driving shaft, namely, the tooth is disengaged can be caused.

Disclosure of Invention

The utility model aims to overcome the defects and provide a pneumatic actuating mechanism which can prevent the gear from disengaging through a simple structure.

The technical scheme of the utility model is a pneumatic actuating mechanism, which comprises an end cover, a piston, a cylinder body, a first air chamber, a second air chamber and a driving shaft; the middle of the cylinder body is provided with a driving shaft, and the cylinder body is symmetrical left and right by taking the driving shaft as a center; end covers are arranged at two ends of the cylinder body, and a piston is arranged between each end cover and the driving shaft; the space between the piston and the driving shaft is a first air chamber, and the space between the piston and the end cover is a second air chamber; the device also comprises a boss; the tail end of the end cover is provided with a boss; the boss can contact with the bottom of the flange of the piston.

Furthermore, a gear is arranged on the driving shaft, a rack is arranged on the piston, and the gear and the rack can be meshed.

Further, the device also comprises a first air source pressure conveying hole and a second air source pressure conveying hole; the first air source pressure conveying hole is communicated with the first air chamber, and the second air source pressure conveying hole is communicated with the second air chamber.

Further, when the piston moves to contact with the boss, the rack on the piston still meshes with the gear on the drive shaft.

The utility model has the advantages that: the utility model discloses under the long-time action of pneumatic actuator or the artificial condition of adjusting pneumatic actuator aperture error, through boss and flange bottom contact, under the second air chamber has air supply pressure's the condition, the piston still can be to closing the direction motion, has avoided the piston to break away from the condition of taking off the tooth promptly with the drive shaft meshing.

The structure gets rid of the limit screw arranged on the end cover of the traditional pneumatic actuator, and provides a limit idea again through the instability of a nut tightening structure, and the structure of the traditional pneumatic actuator is not greatly changed, so that the modification cost is low, and the traditional production line is not influenced.

Drawings

Fig. 1 is a front view of the structure of the present invention.

Fig. 2 is a structural sectional view of the present invention.

Fig. 3 is an enlarged schematic view of the cross section a-a of the present invention.

Description of reference numerals: 1. an end cap; 2. a piston; 3. a cylinder body; 4. a first air chamber; 5. a second air chamber; 6. a drive shaft; 7. a boss; 8. a first gas source pressure delivery orifice; 9. a second gas source pressure delivery port.

Detailed Description

As shown in fig. 1 to 3, a pneumatic actuator comprises an end cover 1, a piston 2, a cylinder 3, a first air chamber 4, a second air chamber 5 and a driving shaft 6; a driving shaft 6 is arranged in the middle of the cylinder body 3, and the cylinder body 3 is symmetrical left and right by taking the driving shaft 6 as the center; end covers 1 are arranged at two ends of the cylinder body 3, and a piston 2 is arranged between the end covers 1 and a driving shaft 6; the space between the piston 2 and the driving shaft 6 is a first air chamber 4, and the space between the piston 2 and the end cover 1 is a second air chamber 5;

also comprises a boss 7; the tail end of the end cover 1 is provided with a boss 7; the boss 7 can be in contact with the bottom of the flange of the piston 2.

The driving shaft 6 is provided with a gear, the piston 2 is provided with a rack, and the gear and the rack can be meshed.

The device also comprises a first air source pressure conveying hole 8 and a second air source pressure conveying hole 9; the first air source pressure conveying hole 8 is communicated with the first air chamber 4, and the second air source pressure conveying hole 9 is communicated with the second air chamber 5.

When the piston 2 moves into contact with the boss 7, the rack on the piston 2 remains engaged with the gear on the drive shaft 6.

The utility model discloses the during operation utilizes the mode of the boss 7 that sets up on the end cover 1 and the contact of the flange bottom of piston 2 in order to reach the function that prevents the piston and take off the tooth. Under the condition that the pneumatic actuator acts for a long time or the opening of the pneumatic actuator is adjusted by people to be wrong, the limit stroke of the piston 3 is the position where the flange end face of the piston 2 is contacted with the boss 7 of the end cover 1 under the pushing of the air source pressure. In this position, the piston 2 is still engaged with the drive shaft 6, so that in the event of a supply pressure in the second air chamber 5, the piston 2 can still move in the closing direction, avoiding the situation in which the piston 2 is disengaged from the drive shaft 6, i.e. is disengaged.

Claims

1. A pneumatic actuating mechanism comprises an end cover (1), a piston (2), a cylinder body (3), a first air chamber (4), a second air chamber (5) and a driving shaft (6); the middle of the cylinder body (3) is provided with a driving shaft (6), and the cylinder body (3) is symmetrical left and right by taking the driving shaft (6) as the center; end covers (1) are arranged at two ends of the cylinder body (3), and a piston (2) is arranged between each end cover (1) and the driving shaft (6); the space between the piston (2) and the driving shaft (6) is a first air chamber (4), and the space between the piston (2) and the end cover (1) is a second air chamber (5); the method is characterized in that: also comprises a boss (7); the tail end of the end cover (1) is provided with a boss (7); the boss (7) can be in contact with the bottom of the flange of the piston (2).

2. The pneumatic actuator of claim 1, wherein: the driving shaft (6) is provided with a gear, the piston (2) is provided with a rack, and the gear and the rack can be meshed.

3. The pneumatic actuator of claim 1, wherein: the device also comprises a first air source pressure conveying hole (8) and a second air source pressure conveying hole (9); the first air source pressure conveying hole (8) is communicated with the first air chamber (4), and the second air source pressure conveying hole (9) is communicated with the second air chamber (5).

4. The pneumatic actuator of claim 2, wherein: when the piston (2) moves to contact with the boss (7), the rack on the piston (2) is still meshed with the gear on the driving shaft (6).