Angular travel double-acting pneumatic diaphragm actuating mechanism

Abstract

The angular travel double-acting pneumatic diaphragm actuating mechanism comprises a shell, a diaphragm cover piece arranged on the shell and a push rod penetrating through the diaphragm cover piece, and the bottom end of the push rod penetrates through the diaphragm cover piece and is located in the shell; the film cover piece comprises a lower film cover, an upper film cover and a cylinder located between the lower film cover and the upper film cover. Membrane cover fasteners are arranged on the two sides of the cylinder body, and the cylinder body is connected with the upper membrane cover and the lower membrane cover through the membrane cover fasteners; a tray is arranged in the membrane cover piece, and membranes are arranged on the upper edge and the lower edge of the tray. The membrane cover piece is divided into the upper membrane cover, the barrel and the lower membrane cover from top to bottom, the tray is arranged in the barrel, and the membranes are arranged above and below the tray, so that the output torque can be controlled according to the size of an air source, and the purposes of improving the torque, optimizing an executing mechanism and prolonging the service life are achieved.

Description

Technical Field

[0001] The invention relates to the production and application field of valve body actuators, and in particular to an angular stroke double-acting pneumatic diaphragm actuator. Background Art

[0002] In the prior art, the angular stroke double-acting pneumatic actuator is used as the control component of the angular stroke control valve, and its structure is mostly a piston cylinder with a gear rack drive. The actuator with this structure uses an O-ring to seal the piston and the cylinder body, which causes friction between the seal ring and the inner wall of the cylinder body, causing the piston to move slowly or wear and cause leakage and failure. In addition, the transmission of this type of piston double-acting pneumatic actuator is mostly a gear rack transmission, with a small force arm and the rack is easily damaged.

[0003] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0004] In order to solve the above technical problems, the present invention proposes an angular stroke double-acting pneumatic diaphragm actuator to achieve the purpose of increasing torque, optimizing the actuator and extending the service life.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] An angular stroke double-acting pneumatic diaphragm actuator comprises a housing, a diaphragm cover arranged on the housing and a push rod passing through the diaphragm cover, wherein the bottom end of the push rod passes through the diaphragm cover and is located in the housing;

[0007] The membrane cover comprises a lower membrane cover, an upper membrane cover and a cylinder located between the lower membrane cover and the upper membrane cover, wherein the middle portion of the cylinder is concave and the cylinder is concave to form upper and lower edges;

[0008] Membrane cover fasteners are provided on both sides of the cylinder, and the cylinder is connected to the upper membrane cover and the lower membrane cover through the membrane cover fasteners; a tray is provided inside the membrane cover, and diaphragms are provided on the upper and lower edges of the tray, wherein the end of the upper diaphragm is located between the upper membrane cover and the cylinder, and the end of the lower diaphragm is located between the lower membrane cover and the cylinder, the upper end of the membrane cover fastener passes through the upper edge of the cylinder, the diaphragm and the upper membrane cover and is tightened and fixed with a first nut, and the lower end of the membrane cover fastener passes through the lower edge of the cylinder, the diaphragm and the lower membrane cover and is tightened and fixed with the first nut.

[0009] The present invention divides the membrane cover into an upper membrane cover, a cylinder and a lower membrane cover from top to bottom, and arranges a tray in the cylinder and diaphragms above and below the tray, so that the output torque can be controlled according to the size of the gas source, thereby achieving the purpose of increasing the torque, optimizing the actuator and extending the service life.

[0010] It is further worth noting that the top end of the push rod passes through a through hole opened in the center of the upper membrane cover, and a limiting screw cover is provided at the through hole.

[0011] The top end of the push rod passes through the limiting screw cover, and a limiting member is arranged at the top end of the push rod, and a second nut is arranged at the position of the push rod inside the limiting screw;

[0012] A first sealing member is arranged between the limiting screw cover and the upper membrane cover, a third nut is arranged on the push rod, and a first washer is arranged between the third nut and the limiting screw cover.

[0013] It is further worth noting that a gasket is arranged between the upper diaphragm and the upper diaphragm cover, and a spring washer is arranged between the gasket and the upper diaphragm cover; and a first O-ring is arranged below the gasket near the push rod.

[0014] It is further worth noting that an adjustment sleeve is provided at the center of the tray, and a vertical through slot is provided at the center of the adjustment sleeve for the push rod to pass through.

[0015] It is further worth noting that the shell is connected to the lower membrane cover via a long tube shaft, a first connecting tube is provided on the side wall of the shell, and the long tube shaft sequentially passes through the lower cover, the shell and the first connecting tube to achieve the connection between the lower cover, the shell and the first connecting tube;

[0016] A bolt is also provided between the shell and the lower diaphragm cover, and the bolt and the long tube axis are symmetrically arranged about the push rod; a second gasket is provided between the bolt and the inner wall of the lower diaphragm cover; a second O-ring is provided between the shell and the lower diaphragm cover, and the second O-ring is close to the bolt, and the second O-ring realizes sealing of the gap formed between the lower diaphragm cover, the bolt and the shell.

[0017] It is further worth noting that a guide sleeve is arranged in the shell, a rotating shaft is arranged outside the guide sleeve, a first bearing is arranged between the top of the rotating shaft and the shell, and a second bearing is arranged between the bottom end of the rotating shaft and the shell; the rotating shaft and the guide sleeve are connected by a top screw;

[0018] The bottom end of the push rod is located in the guide sleeve.

[0019] It is further worth noting that a bearing cover is arranged in the housing, the bearing cover is connected to the housing by screws, and the bearing cover is mounted on the first bearing;

[0020] The bearing cover is provided with a horizontal guide pin, and the side wall of the push rod is provided with a first pin sleeve matched with the guide pin.

[0021] It is further worth noting that the bearing sleeve is sealed with the housing via a third O-ring, and the bearing sleeve is sealed with the rotating shaft via a fourth O-ring.

[0022] It is further worth noting that a second pin sleeve is provided in the upper middle portion of the guide sleeve, a horizontally arranged pin shaft is provided in the second pin sleeve, the pin shaft passes through the bottom end of the push rod, and both ends of the pin shaft are located in the second pin sleeve.

[0023] It is further worth noting that a second connecting tube is also provided on the upper membrane cover, a short tube shaft is provided in the second connecting tube, and the short tube shaft realizes the connection between the second connecting tube and the upper membrane cover.

[0024] The present invention has the following advantages:

[0025] 1. The present invention divides the membrane cover into an upper membrane cover, a cylinder and a lower membrane cover from top to bottom, and arranges a tray in the cylinder and diaphragms above and below the tray, so that the output torque can be controlled according to the size of the gas source, thereby achieving the purpose of increasing the torque, optimizing the actuator and extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0027] Figure 1 It is a structural schematic diagram of an angular stroke double-acting pneumatic diaphragm actuator disclosed in an embodiment of the present invention;

[0028] The numbers and letters in the figure represent the corresponding component names:

[0029] 1. Lower membrane cover 2. Upper membrane cover 3. Cylinder 4. Membrane cover fastener 5. Tray 6. Diaphragm 7. Gasket

[0030] 8. Spring washer 9. First O-ring 10. Adjustment sleeve 11. Limiting screw cap 12. Limiting piece

[0031] 13. Second nut 14. First seal 15. Third nut 16. First washer 17. Long tube shaft

[0032] 18. First connecting pipe 19. Bolt 20. Second washer 21. Guide sleeve 22. Rotating shaft 23. First bearing

[0033] 24. Second bearing 25. Top screw 26. Second pin sleeve 27. Pin shaft 28. Bearing cover 29. Screw

[0034] 30. Guide pin 31. First pin sleeve 32. Third O-ring 33. Fourth O-ring 34. Second connecting pipe

[0035] 35. Spool 36. Housing 37. Second O-ring 38. Push rod. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0037] The present invention provides an angular stroke double-acting pneumatic diaphragm actuator, whose working principle is to divide the diaphragm cover from top to bottom into an upper diaphragm cover, a cylinder and a lower diaphragm cover, and to arrange a tray in the cylinder and diaphragms above and below the tray, so that the output torque can be controlled according to the size of the air source, thereby achieving the purpose of increasing the torque, optimizing the actuator and extending the service life.

[0038] The present invention is further described in detail below with reference to examples and specific implementation modes.

[0039] like Figure 1 As shown, an angular stroke double-acting pneumatic diaphragm actuator comprises a housing 36, a diaphragm cover member disposed on the housing, and a push rod 38 passing through the diaphragm cover member, wherein the bottom end of the push rod passes through the diaphragm cover member and is located in the housing;

[0040] The membrane cover comprises a lower membrane cover 1, an upper membrane cover 2 and a cylinder 3 between the lower membrane cover and the upper membrane cover, wherein the middle of the cylinder is concave, and the concave part of the cylinder is formed with upper and lower edges;

[0041] The cylinder is provided with membrane cover fasteners 4 on both sides, and the cylinder is connected with the upper membrane cover and the lower membrane cover through the membrane cover fasteners; a tray 5 is provided inside the membrane cover, and the upper and lower edges of the tray are provided with membranes 6, wherein the end of the upper membrane is located between the upper membrane cover and the cylinder, and the end of the lower membrane is located between the lower membrane cover and the cylinder, the upper end of the membrane cover fastener passes through the upper edge of the cylinder, the membrane and the upper membrane cover and is tightened and fixed with a first nut, and the lower end of the membrane cover fastener passes through the lower edge of the cylinder, the membrane and the lower membrane cover and is tightened and fixed with a first nut. A gasket 7 is provided between the upper diaphragm and the upper membrane cover, and a spring washer 8 is provided between the gasket and the upper membrane cover; a first O-ring 9 is provided below the gasket near the push rod. An adjustment sleeve 10 is provided at the center of the tray, and a vertical through groove is provided at the center of the adjustment sleeve for the push rod to pass through.

[0042] The top end of the push rod passes through a through hole opened in the center of the upper membrane cover, a limiting screw cover 11 is provided at the through hole, the top end of the push rod passes through the limiting screw cover, and a limiting member 12 is provided at the top end of the push rod, a second nut 13 is provided at the position of the push rod in the limiting screw; a first sealing member 14 is provided between the limiting screw cover and the upper membrane cover, a third nut 15 is provided on the push rod, and a first washer 16 is provided between the third nut and the limiting screw cover.

[0043] The shell is connected to the lower diaphragm cover through a long tube axis 17, and a first connecting tube 18 is provided on the side wall of the shell, and the long tube axis passes through the lower cover, the shell and the first connecting tube in sequence to realize the connection between the lower cover, the shell and the first connecting tube; a bolt 19 is also provided between the shell and the lower diaphragm cover, and the bolt and the long tube axis are symmetrically arranged about the push rod; a second gasket 20 is provided between the bolt and the inner wall of the lower diaphragm cover; a second O-ring 37 is provided between the shell and the lower diaphragm cover, and the second O-ring is arranged close to the bolt, and the second O-ring realizes sealing of the gap formed between the lower diaphragm cover, the bolt and the shell.

[0044] A guide sleeve 21 is provided in the housing, a rotating shaft 22 is provided outside the guide sleeve, a first bearing 23 is provided between the top of the rotating shaft and the housing, and a second bearing 24 is provided between the bottom end of the rotating shaft and the housing; the rotating shaft and the guide sleeve are connected by a top screw 25; the bottom end of the push rod is in the guide sleeve. A second pin sleeve 26 is provided in the upper middle part of the guide sleeve, a horizontally arranged pin shaft 27 is provided in the second pin sleeve, the pin shaft passes through the bottom end of the push rod, and both ends of the pin shaft are in the second pin sleeve.

[0045] A bearing cover 28 is provided in the housing, the bearing cover is connected to the housing by screws 29, and the bearing cover is mounted on the first bearing; the bearing cover is provided with a horizontal guide pin 30, and a first pin sleeve 31 matching with the guide pin is provided on the side wall of the push rod. The bearing sleeve is sealed with the housing by a third O-ring 32, and the bearing sleeve is sealed with the rotating shaft by a fourth O-ring 33.

[0046] The upper membrane cover is also provided with a second connecting tube 34, in which a short tube shaft 35 is provided, and the short tube shaft realizes the connection between the second connecting tube and the upper membrane cover.

[0047] The specific use steps of the present invention are as follows: Figure 1As shown, the air source enters the membrane chamber composed of the cylinder 3, the upper membrane cover 2 and the lower membrane cover 1 through the first connecting pipe 18, and the upper and lower membrane chambers are sealed with the diaphragm 6. The air pressure pushes the diaphragm 6 to drive the tray 5 and the push rod 38 to move downward. When the push rod moves downward, it cannot rotate due to the restriction of the guide pin 30 and the first pin sleeve 31, thereby driving the pin shaft 27 and the second pin sleeve 26 to push the rotating shaft 22 downward. Since the rotating shaft 22 is restricted by the second bearing 24 and the first bearing 23 and cannot move up and down, it can only rotate due to the spiral groove, so the linear motion generated by the push rod 38 is converted into the rotational motion of the rotating shaft 22.

[0048] The output torque of the entire actuator is generated by the gas source pressure acting on the diaphragm 6. By switching the first connecting tube 18 and the second connecting tube 34, the clockwise and counterclockwise conversion can be achieved.

[0049] Through the above method, the present invention provides an angular stroke double-acting pneumatic diaphragm actuator, which divides the diaphragm cover from top to bottom into an upper diaphragm cover, a cylinder and a lower diaphragm cover, and arranges a tray in the cylinder and diaphragms above and below the tray, so that the output torque can be controlled according to the size of the air source. This device has a compact structure and beautiful appearance; at the same time, it has sensitive movement and high positioning accuracy; and it has high interchangeability, and the clockwise and counterclockwise action modes can be changed by replacing the air inlet.

[0050] The above is only a preferred embodiment of the angular stroke double-acting pneumatic diaphragm actuator disclosed in the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the creative concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. An angular stroke double-acting pneumatic diaphragm actuator, characterized in that: It comprises a shell, a membrane cover member arranged on the shell, and a push rod passing through the membrane cover member, wherein the bottom end of the push rod passes through the membrane cover member and is located in the shell; The membrane cover comprises a lower membrane cover, an upper membrane cover and a cylinder located between the lower membrane cover and the upper membrane cover, wherein the middle portion of the cylinder is concave and the cylinder is concave to form upper and lower edges; Membrane cover fasteners are provided on both sides of the cylinder, and the cylinder is connected to the upper membrane cover and the lower membrane cover through the membrane cover fasteners; a tray is provided inside the membrane cover, and diaphragms are provided on the upper and lower edges of the tray, wherein the end of the upper diaphragm is located between the upper membrane cover and the cylinder, and the end of the lower diaphragm is located between the lower membrane cover and the cylinder, the upper end of the membrane cover fastener passes through the upper edge of the cylinder, the diaphragm and the upper membrane cover and is tightened and fixed with a first nut, and the lower end of the membrane cover fastener passes through the lower edge of the cylinder, the diaphragm and the lower membrane cover and is tightened and fixed with the first nut.

2. The angular stroke double-acting pneumatic diaphragm actuator according to claim 1, characterized in that: The top end of the push rod passes through a through hole opened in the center of the upper membrane cover, and a limiting screw cover is provided at the through hole. The top end of the push rod passes through the limiting screw cover, and a limiting member is arranged at the top end of the push rod, and a second nut is arranged at the position of the push rod inside the limiting screw; A first sealing member is arranged between the limiting screw cover and the upper membrane cover, a third nut is arranged on the push rod, and a first washer is arranged between the third nut and the limiting screw cover.

3. The angular stroke double-acting pneumatic diaphragm actuator according to claim 1, characterized in that: A gasket is arranged between the upper diaphragm and the upper diaphragm cover, and a spring washer is arranged between the gasket and the upper diaphragm cover; a first O-ring is arranged below the gasket near the push rod.

4. The angular stroke double-acting pneumatic diaphragm actuator according to claim 1, characterized in that: An adjustment sleeve is arranged at the center of the tray, and a vertical through slot for the push rod to pass through is arranged at the center of the adjustment sleeve.

5. The angular stroke double-acting pneumatic diaphragm actuator according to claim 1, characterized in that: The shell is connected to the lower membrane cover via a long tube shaft, a first connecting tube is provided on the side wall of the shell, and the long tube shaft sequentially passes through the lower cover, the shell and the first connecting tube to achieve the connection between the lower cover, the shell and the first connecting tube; A bolt is also provided between the shell and the lower diaphragm cover, and the bolt and the long tube axis are symmetrically arranged about the push rod; a second gasket is provided between the bolt and the inner wall of the lower diaphragm cover; a second O-ring is provided between the shell and the lower diaphragm cover, and the second O-ring is close to the bolt, and the second O-ring realizes sealing of the gap formed between the lower diaphragm cover, the bolt and the shell.

6. The angular stroke double-acting pneumatic diaphragm actuator according to claim 1, characterized in that: A guide sleeve is arranged in the shell, a rotating shaft is arranged outside the guide sleeve, a first bearing is arranged between the top of the rotating shaft and the shell, and a second bearing is arranged between the bottom of the rotating shaft and the shell; the rotating shaft and the guide sleeve are connected by a top screw; The bottom end of the push rod is located in the guide sleeve.

7. The angular stroke double-acting pneumatic diaphragm actuator according to claim 6, characterized in that: A bearing cover is arranged in the housing, the bearing cover is connected to the housing by screws, and the bearing cover is mounted on the first bearing; The bearing cover is provided with a horizontal guide pin, and the side wall of the push rod is provided with a first pin sleeve matched with the guide pin.

8. The angular stroke double-acting pneumatic diaphragm actuator according to claim 6, characterized in that: The bearing sleeve is sealed with the housing through a third O-ring, and the bearing sleeve is sealed with the rotating shaft through a fourth O-ring.

9. The angular stroke double-acting pneumatic diaphragm actuator according to claim 6, characterized in that: A second pin sleeve is arranged at the upper middle part of the guide sleeve, and a horizontally arranged pin shaft is arranged in the second pin sleeve. The pin shaft passes through the bottom end of the push rod, and both ends of the pin shaft are located in the second pin sleeve.

10. The angular stroke double-acting pneumatic diaphragm actuator according to claim 1, characterized in that: A second connecting tube is also provided on the upper membrane cover, and a short tube shaft is provided in the second connecting tube, and the short tube shaft realizes the connection between the second connecting tube and the upper membrane cover.

Images