Rotary conversion device of pneumatic actuator

Abstract

The utility model discloses a rotary conversion device of a pneumatic actuator, which is characterized by comprising a driving rod, a shifting block and a driving nut, a speed reducer is fixedly arranged on a shell of the multi-rotary pneumatic actuator, a main shaft in the pneumatic actuator is coaxially fixed with an input end of the speed reducer, and an output end of the speed reducer is coaxially fixed with the driving nut. The spindle is a hollow shaft and is coaxial with the driving nut, the driving rod is in threaded connection with the driving nut, one end of the driving rod is inserted into the spindle, one end of the shifting block is fixed to a valve rod of the angular travel valve, a shifting groove is formed in the other end of the shifting block, a shifting pin is fixedly arranged at the other end of the driving rod, and the shifting pin is inserted into the shifting groove and used for driving the shifting block to rotate. The multi-rotation type pneumatic actuator has the advantages that the multi-rotation type pneumatic actuator can drive the angular travel valve to rotate within the range of 0-90 degrees through the rotation conversion device so as to achieve opening and closing of the angular travel valve, the opening and closing speed of the angular travel valve is reduced, the angular travel valve is prevented from generating the water hammer effect, and the service life of the valve is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic actuators for controlling the opening and closing of valves, in particular to a rotation conversion device of a pneumatic actuator. Background Art

[0002] Many valves on field pipelines use pneumatic actuators to control their opening and closing. There are many different types of valves, including rotary valves such as gate valves and globe valves, which generally use multi-rotary pneumatic actuators for opening and closing. There are also quarter-turn valves such as ball valves and butterfly valves, whose stems rotate between 0 and 90 degrees. These quarter-turn valves are currently commonly controlled by quarter-turn pneumatic actuators, such as rack and pinion or scotch fork types. However, these quarter-turn pneumatic actuators have high drive speeds and short valve opening and closing times, which can easily cause water hammer in quarter-turn valves, shortening their service life. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a rotation conversion device for a pneumatic actuator, so that a multi-rotation pneumatic actuator can be used to control the opening and closing of an angular stroke valve and avoid the water hammer effect.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a rotation conversion device of a pneumatic actuator, comprising a driving rod, a shift block and a driving nut, a reducer is fixedly arranged on the housing of the multi-rotation pneumatic actuator, the main shaft in the pneumatic actuator is coaxially fixed with the input end of the reducer, the output end of the reducer is coaxially fixed with the driving nut, the main shaft is a hollow shaft and is coaxially arranged with the driving nut, the driving rod is threadedly connected to the driving nut and one end is inserted into the main shaft, one end of the shift block is fixed to the valve stem of the angular stroke valve, the other end of the shift block is provided with a shift groove, the other end of the drive rod is fixedly provided with a shift pin, and the shift pin is inserted into the shift groove to drive the shift block to rotate.

[0005] Furthermore, the reducer is a planetary reducer, the main shaft is coaxially fixed with the sun gear of the planetary reducer, and the planetary carrier of the planetary reducer is coaxially fixed with the drive nut to drive the drive nut to rotate.

[0006] Furthermore, a mounting seat is fixedly provided on the angular stroke valve, the reduction housing in the reducer is fixed to the mounting seat, and the drive nut extends into the mounting seat and is rotatably connected to the mounting seat.

[0007] Furthermore, the driving nut and the mounting seat are rotationally connected via a thrust bearing.

[0008] Furthermore, the multi-rotation pneumatic actuator is an inner-curve pneumatic actuator.

[0009] Compared with the existing technology, the advantage of the present invention is that the multi-rotary pneumatic actuator can drive the valve of the angular stroke valve to rotate within the range of 0 to 90 degrees through the rotary conversion device to realize the opening and closing of the angular stroke valve, and the driving nut in the rotary conversion device is driven to rotate by the output end of the reducer, and its rotation speed is slow, which reduces the opening and closing speed of the angular stroke valve, avoids the water hammer effect of the angular stroke valve, and ensures the service life of the valve; in addition, the rotary conversion device also makes the multi-rotary pneumatic actuator more adaptable. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a front view of the utility model;

[0011] Figure 2 for Figure 1 AA cross-sectional view. DETAILED DESCRIPTION

[0012] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0013] As shown in the figure, a rotation conversion device of a pneumatic actuator includes a drive rod 1, a shift block 2 and a drive nut 3. A planetary reducer 5 is fixedly provided on the housing 41 of the multi-rotation pneumatic actuator 4. The main shaft 42 in the pneumatic actuator 4 is coaxially fixed with the sun gear in the planetary reducer 5. The planet carrier 51 in the planetary reducer 5 is coaxially fixed with the drive nut 3 to drive the drive nut 3 to rotate. The main shaft 42 is a hollow shaft and is coaxially arranged with the drive nut 3. A mounting seat 7 is fixedly provided on the angular stroke valve 6. The reduction box 52 in the planetary reducer 5 is fixed with the mounting seat 7. The drive nut 3 extends into the mounting seat 7 and is rotatably connected to the mounting seat 7. The drive rod 1 is screwed to the drive nut 3, and one end of the drive rod 1 is inserted into the main shaft 42. One end of the shift block 2 is fixed to the valve stem 61 of the angular stroke valve 6. The other end of the shift block 2 is provided with a shift groove 21. The other end of the drive rod 1 is fixedly or rotatably provided with a shift pin 11. The shift pin 11 is inserted into the shift groove 21 to drive the shift block 2 to rotate.

[0014] In the above embodiment, the drive nut 3 and the mounting seat 7 can be rotatably connected via a thrust bearing 8; and the multi-rotary pneumatic actuator 4 can be an inner-curve pneumatic actuator, i.e., an inner-curve radial piston pneumatic motor, or other existing rotary pneumatic actuators.

[0015] The opening and closing process of the angular stroke valve of the rotary conversion device of the present invention is as follows: the multi-rotation pneumatic actuator 4 works, and the sun gear in the planetary reducer 5 is driven to rotate through the main shaft 42. After deceleration by the planetary reducer 5, the drive nut 3 is driven to rotate through the planetary carrier 51. The drive nut 3 drives the drive rod 1 to move linearly, and the shifting pin 11 on the drive rod 1 and the shifting groove 21 on the shifting block 2 are matched to drive the shifting block 2 to rotate. The shifting block 2 drives the valve stem 61 of the angular stroke valve 6 to rotate, thereby realizing the opening and closing operation of the angular stroke valve.

[0016] The protection scope of the present invention includes but is not limited to the above embodiments, and its protection scope is subject to the claims. Any replacement, deformation, and improvement of the technology that can be easily thought of by technicians in this field fall within the protection scope of the present invention.

Claims

1. A rotation conversion device for a pneumatic actuator, characterized in that It includes a driving rod, a shift block and a driving nut. A reducer is fixedly arranged on the housing of the multi-rotation pneumatic actuator. The main shaft in the pneumatic actuator is coaxially fixed with the input end of the reducer, and the output end of the reducer is coaxially fixed with the driving nut. The main shaft is a hollow shaft and is coaxially arranged with the driving nut. The driving rod is threadedly connected to the driving nut and one end is inserted into the main shaft. One end of the shift block is fixed to the valve stem of the angular stroke valve. The other end of the shift block is provided with a shift groove. The other end of the drive rod is fixed with a shift pin, and the shift pin is inserted into the shift groove to drive the shift block to rotate.

2. The rotation conversion device of a pneumatic actuator according to claim 1, characterized in that: The reducer is a planetary reducer, the main shaft is fixed coaxially with the sun gear in the planetary reducer, and the planet carrier in the planetary reducer is fixed coaxially with the drive nut to drive the drive nut to rotate.

3. The rotation conversion device of a pneumatic actuator according to claim 1, characterized in that: A mounting seat is fixedly provided on the angular stroke valve, the reduction box body in the reducer is fixed to the mounting seat, and the driving nut extends into the mounting seat and is rotatably connected to the mounting seat.

4. The rotation conversion device of a pneumatic actuator according to claim 3, characterized in that: The driving nut and the mounting seat are rotationally connected via a thrust bearing.

5. The rotation conversion device of a pneumatic actuator according to claim 1, characterized in that: The multi-turn pneumatic actuator is an inner curve pneumatic actuator.

Images