CN219692406U

CN219692406U - Quick pneumatic actuator

Info

Publication number: CN219692406U
Application number: CN202320651635.2U
Authority: CN
Inventors: 吴伟国
Original assignee: Wuxi Wierxun Fluid Control Technology Co ltd
Current assignee: Wuxi Wierxun Fluid Control Technology Co ltd
Priority date: 2023-03-29
Filing date: 2023-03-29
Publication date: 2023-09-15
Anticipated expiration: 2033-03-29

Abstract

The utility model discloses a quick-acting pneumatic actuator, which comprises a cylinder body and an inner gear shaft of the cylinder body, wherein pistons are arranged in the cylinder body at two sides of a gear shaft, the pistons are symmetrically arranged at the center of a circle center of the gear shaft, two ends of the cylinder body are respectively provided with an end cover, the cylinder body between the two pistons is a middle cavity, the cylinder body between the piston and the end covers is a spring cavity, a return spring is arranged in the spring cavity, two through holes A communicated with the middle cavity are formed in the cylinder body, an air passage is formed in the inner wall of the cylinder body, and a through hole B communicated with the air passage is formed in the cylinder body; the utility model designs four vent holes, the traditional NAMUR vent interface has only two vent holes, the air flow is small, the pneumatic actuator has long switching time, the utility model develops a double NAMUR vent interface, two A through holes and two B through holes, the number of the vent holes is increased to four, the air flow is doubled, and the switching time of the pneumatic actuator is effectively shortened.

Description

Quick pneumatic actuator

Technical Field

The utility model relates to the technical field of pneumatic actuators, in particular to a quick pneumatic actuator.

Background

The pneumatic actuator is an actuating device for driving the opening and closing or adjusting valve by air pressure, and is also called as a pneumatic actuating mechanism or pneumatic device, the actuating mechanism and the adjusting mechanism of the pneumatic actuator are unified and integrated, and the actuating mechanism comprises a film type actuating mechanism, a piston type actuating mechanism, a shifting fork type actuating mechanism and a gear rack type actuating mechanism. The piston type stroke is long, and the piston type hydraulic pump is suitable for occasions requiring larger thrust; the thin film type stroke is smaller, and only the valve rod can be directly driven. The shifting fork type pneumatic actuator has the characteristics of large torque, small space, more accordant torque curve of the valve and the like, but is not attractive; are commonly used on high torque valves. The rack and pinion type pneumatic actuator has the advantages of simple structure, stable and reliable action, safety, explosion prevention and the like, and is widely applied to production processes with higher safety requirements, such as power plants, chemical industry, oil refining and the like. The C-shaped rack and pinion pneumatic actuator is a tin-free micro-elson classical product, wherein the NAMUR ventilation interface is the only interface connected with the pneumatic valve, and the structural form directly determines the flow and the action speed of compressed air of the actuator.

The traditional NAMUR ventilation interface has only two ventilation ports, the air flow is small, and the switching time of the actuator is long. Therefore, a fast pneumatic actuator is designed to increase the air flow and effectively shorten the switching time.

Disclosure of Invention

In order to solve the technical problems, the utility model provides a quick-acting pneumatic actuator.

The technical scheme of the utility model is as follows: the quick-acting pneumatic actuator comprises a cylinder body, wherein a gear shaft which is rotationally connected with the cylinder body is arranged in the cylinder body, pistons are arranged in the cylinder body at two sides of the gear shaft, the pistons are symmetrically arranged in the center of a circle center of the gear shaft, and end covers are arranged at two ends of the cylinder body;

the cylinder body between two pistons is the intermediate chamber, and the cylinder body between piston and the end cover is the spring chamber, be equipped with reset spring in the spring chamber, just reset spring one end is connected with the piston, and the reset spring other end is connected with the end cover, is equipped with two A through-holes with intermediate chamber intercommunication on the cylinder body, and the cylinder body inner wall is equipped with the air flue, and the air flue both ends communicate with the spring chamber of corresponding one side, every A through-hole one side all be equipped with one be used for with the B through-hole of air flue intercommunication.

Description: traditional NAMUR ventilation interface only has two air vents, and the air flow is little, and executor switch time is long, the utility model discloses developed two NAMUR ventilation interface, two A through-holes and two B through-holes, the air vent increases four, and the air flow increases one time, has effectively shortened the switch time of executor.

Further, 1-6 return springs are respectively arranged in the spring cavities.

Description: the spring cavities on two sides are provided with 1-6 return springs, and the number of the return springs is set according to the torque requirement.

Further, the gear 21 on the gear shaft 2 is meshed with the rack 31 on the piston 3 for transmission.

Description: the utility model is a conventional gear rack type (double-piston rack type) pneumatic actuator, which has the characteristics of compact structure, attractive appearance, rapid reaction, stable operation, long service life and the like.

Further, 6005-T5 aluminum alloy is selected as a cylinder body material, the surface of the cylinder body is subjected to hard oxidation treatment or powder polyester treatment or PTEE coating treatment, O-shaped rings are arranged between the cylinder body and the two end covers, the O-shaped rings are made of nitrile rubber, the O-shaped rings have tightness between the cylinder body and the end covers, and the phenomenon of air leakage is avoided.

Description: the cylinder body adopts 6005-T5 aluminum alloy and carries out the treatment, so that the long-term fault-free operation of the actuator in a severe working environment is ensured.

Further, an adjusting assembly is arranged on the cylinder body and comprises an adjusting nut and an adjusting screw, and one end of the adjusting screw stretches into the cylinder body to be in contact with the gear shaft.

Description: the angle adjustment of the gear shaft is realized at different positions around the two adjusting screws and at different contact positions between the bolt and the gear shaft.

Further, be equipped with supplementary reset assembly in the reset spring, supplementary reset assembly includes threaded rod and sleeve, threaded rod one end stretches into in the sleeve, be equipped with in the sleeve with threaded rod complex screw thread, the threaded rod other end be equipped with piston fixed connection's first baffle, sleeve one end is equipped with the second baffle that rotates spacing connection with the end cover, reset spring one end and first baffle fixed connection, the reset spring other end is connected with the second baffle, is equipped with the dish spring of being connected with the second baffle in the sleeve.

Description: the auxiliary reset assembly is arranged, the piston is ensured to push the reset spring to stretch out and draw back on the threaded rod through the threaded rod and the sleeve, the reset spring is prevented from twisting, the stability of the reset spring is ensured, the long-term effective reset effect is kept, the reset spring can be prevented from losing the constraint force when the actuator is overhauled, the end cover of the fastening bolt is easy to fly, and meanwhile, the disc spring can assist the reset spring to reset, so that the closing time of the actuator is shortened.

The beneficial effects of the utility model are as follows:

(1) The utility model designs four vent holes, the traditional NAMUR vent interface has only two vent holes, the air flow is small, the pneumatic actuator has long switching time, the utility model develops a double NAMUR vent interface, two A through holes and two B through holes, the vent holes are increased to four, the air flow is doubled, and the switching time of the pneumatic actuator is effectively shortened.

(2) The utility model discloses set up supplementary reset assembly, through setting up threaded rod and sleeve, ensure that the piston promotes reset spring and stretches out and draws back on the threaded rod, avoid reset spring to twist reverse, ensure reset spring's stability, keep long-term effectual reset action, also can avoid reset spring to lose the confining force when overhauling pneumatic actuator, will unload fastening bolt's end cover top easily and fly, the dish spring can assist reset spring to reset simultaneously, reduces pneumatic actuator's closing time.

Drawings

FIG. 1 is an internal block diagram of a pneumatic actuator of the present utility model;

FIG. 2 is a schematic view of the utility model in the direction A of FIG. 1;

FIG. 3 is a schematic illustration of the communication between the through-hole A and the cylinder according to the present utility model;

FIG. 4 is a schematic illustration of the communication between the B through hole and the cylinder block according to the present utility model;

FIG. 5 is an internal block diagram of the pneumatic actuator of the present utility model when open;

FIG. 6 is a schematic diagram of a reset assembly of the present utility model;

the device comprises a 1-cylinder body, an 11-A through hole, a 12-B through hole, a 13-middle cavity, a 14-spring cavity, a 2-gear shaft, a 21-gear, a 3-piston, a 31-rack, a 4-reset spring, a 5-end cover, a 6-adjusting component, a 61-adjusting nut, a 62-adjusting screw, a 7-auxiliary reset component, a 71-threaded rod, a 711-first baffle, a 72-sleeve, a 721-second baffle and a 722-disc spring.

Detailed Description

The utility model will be described in further detail with reference to the following embodiments to better embody the advantages of the utility model.

Example 1

As shown in fig. 1, 2, 3 and 4, a quick-acting pneumatic actuator comprises a cylinder body 1, wherein a gear shaft 2 which is rotationally connected with the cylinder body 1 is arranged in the cylinder body 1, pistons 3 are arranged in the cylinder body 1 at two sides of the gear shaft 2, the pistons 3 are symmetrically arranged at the center of a circle of the gear shaft 2, and two ends of the cylinder body 1 are respectively provided with an end cover 5 which is detachably connected with the cylinder body through bolts;

the cylinder body 1 between the two pistons 3 is a middle cavity 13, the cylinder body 1 between the pistons 3 and the end cover 5 is a spring cavity 14, a return spring 4 is arranged in the spring cavity 14, the left end of the return spring 4 is connected with the pistons 3, the right end of the return spring 4 is connected with the end cover 5, two through holes 11A communicated with the middle cavity 13 are arranged on the cylinder body 1, an air passage is arranged on the inner wall of the cylinder body 1, two ends of the air passage are communicated with the spring cavity 14 on the corresponding side, and a through hole 12B communicated with the air passage is arranged on one side of each through hole 11A;

the gear 21 on the gear shaft 2 is meshed with the rack 31 on the piston 3 for transmission;

two return springs 4 are arranged in each spring cavity 14;

o-shaped rings are arranged between the cylinder body 1 and the two end covers 5, and the O-shaped rings are made of nitrile rubber;

selecting 6005-T5 aluminum alloy as a material of the cylinder body 1, and performing hard oxidation treatment on the surface of the cylinder body 1;

as shown in fig. 2, two groups of adjusting assemblies 6 are arranged on the cylinder body 1, the adjusting assemblies 6 comprise adjusting nuts 61 and adjusting screws 62, and the upper ends of the adjusting screws 62 extend into the cylinder body 1 to contact with the gear shaft 2;

all the pneumatic actuator components used are commercially available rack and pinion type (double-piston rack type) pneumatic actuator components or are subjected to shape adjustment according to the commercially available rack and pinion type (double-piston rack type) pneumatic actuator components.

The actuator switching principle is as follows:

as shown in fig. 5, two a through holes 11 are simultaneously charged, compressed air enters an intermediate cavity 13, the pistons 3 at two sides are forced to move towards the end cover 5, the gear 21 is rotated anticlockwise, the pneumatic actuator is opened, and air in the spring cavities 14 at two sides is discharged from two B through holes 12; as shown in fig. 1, when the two a through holes 11 are connected to the atmosphere, the return springs 4 of the spring chambers 14 on both sides rebound to urge the pistons 3 toward each other, causing the gear 21 to rotate clockwise, closing the pneumatic actuator, while the air in the intermediate chamber 13 is discharged from the two a through holes 11.

Example 2

The embodiment is basically the same as embodiment 1, except that, as shown in fig. 6, an auxiliary reset assembly 7 is disposed in the reset spring 4, the auxiliary reset assembly 7 includes a threaded rod 71 and a sleeve 72, the right end of the threaded rod 71 extends into the sleeve 72, a thread matched with the threaded rod 71 is disposed in the sleeve 72, a first baffle 711 fixedly connected with the piston 3 is disposed at the left end of the threaded rod 71, a second baffle 721 is disposed at the right end of the sleeve 72 and is in rotation limiting connection with the end cover 5, a groove disposed on the end cover 5 is clamped with the second baffle 721, so that the cover plate 5 is in rotation limiting connection with the second baffle 721, the left end of the reset spring 4 is fixedly connected with the first baffle 711, the right end of the reset spring 4 is connected with the second baffle 721, and a disc spring 722 connected with the second baffle 721 is disposed in the sleeve 72;

the operation method of the auxiliary reset assembly 7 is as follows:

when the two A through holes 11 are simultaneously fed with air, compressed air enters the middle cavity 13, the pistons 3 on two sides are forced to move towards the end cover 5, the return spring 4 is compressed, meanwhile, the threaded rod 71 moves towards the end cover 5, the sleeve 72 rotates to enable the threaded rod 71 to extend into the sleeve 72 further and compress the disc spring 722, the gear 21 rotates anticlockwise, and the pneumatic actuator is opened; when the two A through holes 11 are communicated with the atmosphere, the reset springs 4 of the spring cavities 14 at the two sides rebound to reset to force the pistons 3 to be close to each other, meanwhile, the disc springs 722 rebound, the auxiliary threaded rod 71 moves towards the middle cavity 13, the auxiliary pistons 3 are close to each other, and the pneumatic actuator is closed quickly.

Claims

1. The quick-acting pneumatic actuator is characterized by comprising a cylinder body (1), wherein a gear shaft (2) which is rotationally connected with the cylinder body is arranged in the cylinder body (1), pistons (3) are arranged in the cylinder body (1) at two sides of the gear shaft (2), the pistons (3) are symmetrically arranged in two by the center of a circle of the gear shaft (2), and end covers (5) are arranged at two ends of the cylinder body (1);

the cylinder body (1) between two pistons (3) is middle chamber (13), cylinder body (1) between piston (3) and end cover (5) is spring chamber (14), be equipped with reset spring (4) in spring chamber (14), just reset spring (4) one end is connected with piston (3), and reset spring (4) other end is connected with end cover (5), is equipped with two A through-holes (11) with middle chamber (13) intercommunication on cylinder body (1), and cylinder body (1) inner wall is equipped with the air flue, and air flue both ends and the spring chamber (14) intercommunication of corresponding one side, every A through-hole (11) one side all be equipped with one be used for with B through-hole (12) of air flue intercommunication.

2. A fast acting pneumatic actuator according to claim 1, characterized in that 1-6 return springs (4) are provided in each of the spring chambers (14).

3. A fast acting pneumatic actuator according to claim 1, wherein the gear (21) on the gear shaft (2) is in meshed transmission with the rack (31) on the piston (3).

4. The quick-acting pneumatic actuator according to claim 1, wherein the cylinder body (1) is made of 6005-T5 aluminum alloy, the surface of the cylinder body (1) is subjected to hard oxidation treatment or powder polyester treatment or PTEE coating treatment, O-shaped rings are arranged between the cylinder body (1) and the two end covers (5), and the O-shaped rings are made of nitrile rubber.

5. A quick acting pneumatic actuator according to claim 1, wherein the cylinder (1) is provided with two sets of adjusting assemblies (6), the adjusting assemblies (6) comprise adjusting nuts (61) and adjusting screws (62), and one ends of the adjusting screws (62) extend into the cylinder (1) to be in contact with the gear shaft (2).

6. The quick-acting pneumatic actuator according to claim 1, wherein an auxiliary reset assembly (7) is arranged in the reset spring (4), the auxiliary reset assembly (7) comprises a threaded rod (71) and a sleeve (72), one end of the threaded rod (71) stretches into the sleeve (72), threads matched with the threaded rod (71) are arranged in the sleeve (72), a first baffle (711) fixedly connected with the piston (3) is arranged at the other end of the threaded rod (71), a second baffle (721) fixedly connected with the end cover (5) in a rotation limiting manner is arranged at one end of the sleeve (72), one end of the reset spring (4) is fixedly connected with the first baffle (711), the other end of the reset spring (4) is connected with the second baffle (721), and a disc spring (722) connected with the second baffle (721) is arranged in the sleeve (72).