CN210566576U

CN210566576U - Pneumatic actuator

Info

Publication number: CN210566576U
Application number: CN201920831342.6U
Authority: CN
Inventors: 姚宝玲; 陈伟; 陈西磊; 林程远
Original assignee: Zhejiang Fuge Fluid Control Equipment Co Ltd
Current assignee: Zhejiang Fuge Fluid Control Equipment Co Ltd
Priority date: 2019-06-04
Filing date: 2019-06-04
Publication date: 2020-05-19
Anticipated expiration: 2029-06-04

Abstract

The utility model provides a pneumatic actuator belongs to mechanical technical field. It has solved the poor problem of the direction effect that current piston reciprocated in the cylinder body. This pneumatic actuator, including main cylinder body, piston rod and set up in main cylinder body and can reciprocate in main cylinder body the piston, the upper end of piston rod extend in main cylinder body and with piston fixed connection, the inlet port has been seted up to the lower surface of main cylinder body, the through-hole has been seted up at the middle part of main cylinder body upper surface, the lower extreme of installation section of thick bamboo extend in the through-hole and with main cylinder body fixed connection, top surface in the installation section of thick bamboo is fixed with uide bushing one, be provided with uide bushing two in the main cylinder body. The sliding structure of the first guide sleeve and the second guide sleeve, the piston rod and the sliding structure of the installation cylinder of the structure play a guiding role in reciprocating the piston, the double-guide structure ensures that the piston is more stable in reciprocating, the phenomenon that the piston is blocked in the main cylinder body is avoided, the piston is not easy to wear, and the service life of the piston is prolonged.

Description

Pneumatic actuator

Technical Field

The utility model belongs to the technical field of machinery, especially a pneumatic actuator.

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. The pneumatic actuator is also provided with a certain auxiliary device, a valve positioner and a hand wheel mechanism are commonly used, 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 a controller, and the hand wheel mechanism is used for directly operating the control valve by utilizing the hand wheel mechanism when a control system is in power failure or air supply failure and the controller has no output or the actuating mechanism fails, so that the normal operation of production is maintained.

At present, as long as the existing pneumatic actuator is provided with a double-acting pneumatic actuator and a single-acting pneumatic actuator, compared with the double-acting pneumatic actuator, the single-acting pneumatic actuator has small air consumption, a spring is arranged in a main cylinder body of the single-acting pneumatic actuator and acts on a piston, the main cylinder body is inflated to drive the piston to overcome the acting force of the spring to move upwards, and after the actuator performs opening operation, the spring pushes the piston back to the bottom of the main cylinder body, so that the automatic closing function is realized. Among current traditional single-action pneumatic actuator, the piston is relatively poor at the in-process direction effect that reciprocates, and the dead phenomenon of card appears in the cylinder body easily to the piston, because the precision that the piston reciprocated is relatively poor, the outer peripheral face of piston is wearing and tearing easily, and the life-span of piston is shorter.

Disclosure of Invention

The utility model aims at having the above-mentioned problem to current technique, provided a pneumatic actuator, the utility model aims to solve the technical problem that: how to improve the guiding effect of the piston moving up and down in the cylinder body.

The purpose of the utility model can be realized by the following technical proposal:

a pneumatic actuator comprises a main cylinder body, a piston rod and a piston which is arranged in the main cylinder body and can move up and down in the main cylinder body, wherein the upper end of the piston rod extends into the main cylinder body and is fixedly connected with the piston, the lower surface of the main cylinder body is provided with an air inlet hole, the pneumatic actuator is characterized in that the middle part of the upper surface of the main cylinder body is provided with a through hole, the pneumatic actuator also comprises an installation cylinder, the lower end of the installation cylinder extends into the through hole and is fixedly connected with the main cylinder body, the top surface in the installation cylinder is fixedly provided with a first guide sleeve, the main cylinder body is internally provided with a second guide sleeve, the upper end of the second guide sleeve extends into the first guide sleeve, the lower end of the second guide sleeve abuts against the upper surface of the piston, the second guide sleeve is internally provided with a guide rod, the lower end of the guide rod is fixedly connected, the main cylinder body is internally provided with a spring sleeved on the first guide sleeve and the second guide sleeve.

After uide bushing one and uide bushing two cup joint each other, uide bushing two can slide from top to bottom for uide bushing one, the sliding construction of uide bushing one and uide bushing two plays the effect of direction to reciprocating of piston, through setting up the guide bar after, the length of piston rod has been prolonged in other words, the effect of direction is played to reciprocating of piston rod to the sliding construction of piston rod and installation section of thick bamboo, because the piston is again with piston rod fixed connection, the sliding construction of uide bushing one and uide bushing two, the piston rod all plays the effect of direction to reciprocating of piston with the sliding construction of installation section of thick bamboo, two guide structure guarantee reciprocating more stable of piston, avoid the piston to appear blocking phenomenon in main cylinder body, the piston is difficult for wearing and tearing, the life of piston has been improved.

In the above pneumatic actuator, the middle of the inner top surface of the mounting cylinder protrudes downward to form a cylindrical boss, the upper end of the first guide sleeve is sleeved on the outer circumferential surface of the boss, and the upper end of the first guide sleeve is provided with an upper flange attached to the inner top surface of the mounting cylinder; the lower end of the second guide sleeve is in threaded connection with a positioning sleeve, the lower end of the positioning sleeve is provided with a lower flanging, the upper end of the spring abuts against the upper flanging, and the lower end of the spring abuts against the lower flanging. In the structure, the spring pushes the guide sleeve upwards to enable the upper flanging to be attached to the inner top surface of the mounting cylinder, the spring pushes the guide sleeve II downwards to enable the lower flanging to be attached to the upper surface of the piston, the guide sleeve I and the mounting cylinder, and the guide sleeve II and the piston are not rigidly connected, so that the guide sleeve I and the guide sleeve II are convenient to mount and dismount in the main cylinder body; the boss can enable the first guide sleeve to be quickly positioned, and the first guide sleeve is prevented from moving left and right; the end part of the spring is not in direct contact with the piston and the mounting cylinder, so that the piston and the mounting cylinder are protected, and the abrasion of the piston and the mounting cylinder is reduced.

In the pneumatic actuator, the lower end of the first guide sleeve is inwards turned to form an inner turned edge, the upper end of the second guide sleeve penetrates through the inner turned edge and is sleeved with the inner turned edge, the upper end of the second guide sleeve is sleeved with a wear-resistant sleeve, and the wear-resistant sleeve can abut against the inner turned edge. The structure reduces the contact area between the first guide sleeve and the second guide sleeve, reduces the rapid abrasion of the first guide sleeve and the second guide sleeve, further reduces the abrasion of the first guide sleeve and the second guide sleeve by arranging the wear-resistant sleeve, and prolongs the service life of the first guide sleeve and the second guide sleeve.

In the above pneumatic actuator, the top surface of the mounting cylinder is provided with a yielding hole, the outer top surface of the mounting cylinder is fixed with a cover plate, the cover plate is provided with a guide hole coaxial with the yielding hole, and the upper end of the guide rod sequentially penetrates through the yielding hole and the guide hole.

In the above pneumatic actuator, the upper end surface of the piston rod is provided with a threaded hole, the lower end of the guide rod is in threaded connection with the threaded hole, and the lower end of the guide rod is in threaded connection with a limit nut.

Compared with the prior art, the utility model discloses a pneumatic actuator has following advantage: the sliding structure of the first guide sleeve and the second guide sleeve, the piston rod and the sliding structure of the installation cylinder of the structure play a guiding role in reciprocating the piston, the double-guide structure ensures that the piston is more stable in reciprocating, the phenomenon that the piston is blocked in the main cylinder body is avoided, the piston is not easy to wear, and the service life of the piston is prolonged.

Drawings

Fig. 1 is a schematic sectional structure of the present invention.

In the figure, 1, a main cylinder body; 1a, an air inlet hole; 1b, a through hole; 2. a piston rod; 21. a threaded hole; 22. a step; 3. a piston; 4. mounting the cylinder; 41. a boss; 42. a hole of abdication; 5. a first guide sleeve; 51. upward flanging; 52. inward flanging; 6. a second guide sleeve; 7. a guide bar; 8. a spring; 9. a positioning sleeve; 91. downward flanging; 10. a wear-resistant sleeve; 11. a cover plate; 11a, a guide hole; 12. and a limiting nut.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in figure 1, the pneumatic actuator comprises a main cylinder body 1, a piston rod 2 and a piston 3 which is arranged in the main cylinder body 1 and can move up and down in the main cylinder body 1, wherein the upper end of the piston rod 2 extends into the main cylinder body 1 and is fixedly connected with the piston 3, the lower surface of the main cylinder body 1 is provided with an air inlet 1a, the middle part of the upper surface of the main cylinder body 1 is provided with a through hole 1b, the pneumatic actuator also comprises an installation cylinder 4, the lower end of the installation cylinder 4 extends into the through hole 1b and is fixedly connected with the main cylinder body 1, the top surface in the installation cylinder 4 is fixedly provided with a guide sleeve I5, a guide sleeve II 6 is arranged in the main cylinder body 1, the upper end of the guide sleeve II 6 extends into the guide sleeve I5, the lower end of the guide sleeve II abuts against the upper surface of the piston 3, a guide rod 7 is arranged in the guide sleeve II 6, the lower end of the guide rod 7, the main cylinder body 1 is internally provided with a spring 8 which is sleeved on the first guide sleeve 5 and the second guide sleeve 6.

As shown in fig. 1, the middle part of the inner top surface of the mounting tube 4 protrudes downwards to form a cylindrical boss 41, the upper end of the first guide sleeve 5 is sleeved on the outer peripheral surface of the boss 41, and the upper end of the first guide sleeve 5 is provided with an upper flange 51 which is attached to the inner top surface of the mounting tube 4; the piston 3 is sleeved on the piston rod 2, the lower surface of the piston 3 abuts against the step 22 on the piston rod 2, the upper end part of the piston rod 2 is in threaded connection with the locking nut 13, the piston rod 2 is sleeved with the backing plate 14, the backing plate 14 abuts against the upper surface of the piston 3, the backing plate 14 is tightly pressed on the upper surface of the piston 3 by the locking nut 13, the lower end part of the guide sleeve II 6 is sleeved on the outer peripheral surface of the backing plate 14, the backing plate 14 plays a role in quickly positioning the guide sleeve II 6, and the guide sleeve II 6 is prevented from transversely moving; the lower end of the second guide sleeve 6 is in threaded connection with a positioning sleeve 9, the lower end of the positioning sleeve 9 is provided with a lower flanging 91, the upper end of the spring 8 abuts against the upper flanging 51, and the lower end of the spring abuts against the lower flanging 91.

As shown in fig. 1, the lower end of the first guide sleeve 5 is turned inwards to form an inward turned edge 52, the upper end of the second guide sleeve 6 penetrates through the inward turned edge 52 and is sleeved with the inward turned edge 52, the upper end of the second guide sleeve 6 is sleeved with the wear-resistant sleeve 10, and the wear-resistant sleeve 10 can abut against the inward turned edge 52.

As shown in fig. 1, the top surface of the mounting tube 4 is provided with a yielding hole 42, the outer top surface of the mounting tube 4 is fixed with a cover plate 11, the cover plate 11 is provided with a guide hole 11a coaxial with the yielding hole 42, and the upper end of the guide rod 7 sequentially passes through the yielding hole 42 and the guide hole 11 a.

As shown in fig. 1, a threaded hole 21 is opened on the upper end surface of the piston rod 2, the lower end of the guide rod 7 is screwed with the threaded hole 21, and the lower end of the guide rod 7 is screwed with the limit nut 12.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The pneumatic actuator comprises a main cylinder body (1), a piston rod (2) and a piston (3) which is arranged in the main cylinder body (1) and can move up and down in the main cylinder body (1), wherein the upper end of the piston rod (2) extends into the main cylinder body (1) and is fixedly connected with the piston (3), an air inlet hole (1a) is formed in the lower surface of the main cylinder body (1), the pneumatic actuator is characterized in that a through hole (1b) is formed in the middle of the upper surface of the main cylinder body (1), the pneumatic actuator further comprises an installation cylinder (4), the lower end of the installation cylinder (4) extends into the through hole (1b) and is fixedly connected with the main cylinder body (1), a first guide sleeve (5) is fixed on the top surface in the installation cylinder (4), a second guide sleeve (6) is arranged in the main cylinder body (1), and the upper end of the second guide sleeve (6) extends into the first guide sleeve (5), The lower extreme supports with the upper surface of piston (3) and leans on, be provided with guide bar (7) in uide bushing two (6), the lower extreme of guide bar (7) and the upper end fixed connection of piston rod (2), the top surface of installation section of thick bamboo (4) is run through and can slide from top to bottom to the upper end of guide bar (7), spring (8) on uide bushing one (5) and uide bushing two (6) are established to the cover to having in main cylinder body (1).

2. The pneumatic actuator according to claim 1, wherein the middle part of the inner top surface of the mounting cylinder (4) is protruded downwards to form a cylindrical boss (41), the upper end of the first guide sleeve (5) is sleeved on the outer circumferential surface of the boss (41), and the upper end of the first guide sleeve (5) is provided with an upper flange (51) which is abutted against the inner top surface of the mounting cylinder (4); the lower end of the second guide sleeve (6) is in threaded connection with a positioning sleeve (9), the lower end of the positioning sleeve (9) is provided with a lower flanging (91), the upper end of the spring (8) abuts against the upper flanging (51), and the lower end of the spring abuts against the lower flanging (91).

3. The pneumatic actuator according to claim 2, wherein the lower end of the first guide sleeve (5) is turned inwards to form an inward turned edge (52), the upper end of the second guide sleeve (6) penetrates through the inward turned edge (52) and is sleeved with the inward turned edge (52), the upper end of the second guide sleeve (6) is sleeved with a wear-resistant sleeve (10), and the wear-resistant sleeve (10) can abut against the inward turned edge (52).

4. The pneumatic actuator according to claim 1, wherein the top surface of the mounting cylinder (4) is provided with a yielding hole (42), the outer top surface of the mounting cylinder (4) is fixed with a cover plate (11), the cover plate (11) is provided with a guide hole (11a) coaxial with the yielding hole (42), and the upper end of the guide rod (7) sequentially penetrates through the yielding hole (42) and the guide hole (11 a).

5. The pneumatic actuator according to claim 1, wherein a threaded hole (21) is formed in the upper end surface of the piston rod (2), the lower end of the guide rod (7) is in threaded connection with the threaded hole (21), and a limit nut (12) is in threaded connection with the lower end of the guide rod (7).