CN216923391U

CN216923391U - Pneumatic actuator limiting device and pneumatic actuator

Info

Publication number: CN216923391U
Application number: CN202123326722.0U
Authority: CN
Inventors: 田钧山; 钟数平
Original assignee: Shanghai Hegao Valve Co ltd
Current assignee: Shanghai Hegao Valve Co ltd
Priority date: 2021-12-28
Filing date: 2021-12-28
Publication date: 2022-07-08
Anticipated expiration: 2031-12-28

Abstract

The utility model discloses a pneumatic actuator limiting device, which limits a pneumatic actuator and comprises: the end cover and the limiting module; the limiting module is sleeved on the transmission shaft and used for limiting the transmission shaft; the end cover covers the limiting module, and the limiting module is located in the end cover. The pneumatic actuator can adjust the driving stroke of the pneumatic actuator, is suitable for valve switches of different types and similar structures, has the characteristics of strong impact resistance, long service life, environment-friendly process, simple structure, convenience in assembly and maintenance, low production and maintenance cost and wide application prospect.

Description

Pneumatic actuator limiting device and pneumatic actuator

Technical Field

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

Background

In the prior art, a piston inside a cylinder body of a pneumatic actuator is pushed by gas to move towards two ends of the cylinder body, and the piston is meshed with a transmission shaft to drive the transmission shaft to move; the piston is driven by a spring in the cylinder body, when the air pressure in the cylinder body is reduced to a certain level, the spring drives the piston to move, and then the piston drives the transmission shaft to rotate.

At present, the cylinder body of the pneumatic actuator is generally made of a metal material such as a high polymer plastic material or an aluminum alloy material.

The cylinder body is a pneumatic actuator made of plastic, a special limiting mechanism is not arranged, the piston is blocked when contacting cover plates at two ends of the cylinder body, passive limiting is achieved, the stroke of the piston cannot be actively limited, and therefore the rotating angle of the transmission shaft cannot be adjusted.

The cylinder body is made of an aluminum alloy pneumatic actuator, the aluminum alloy needs to be electroplated in the production process, and the pneumatic actuator is not environment-friendly and high in processing cost.

Disclosure of Invention

According to an embodiment of the present invention, there is provided a pneumatic actuator limiting device for limiting a rotation angle of a transmission shaft of a pneumatic actuator, including: the end cover and the limiting module;

the limiting module is sleeved on the transmission shaft and used for limiting the rotation angle of the transmission shaft;

the end cover is arranged on the limiting module, and the limiting module is positioned in the end cover.

Further, the limiting module comprises: the limiting ring, the keel and the two pairs of limiting pieces;

the end cover is connected with a cylinder body of the pneumatic actuator, the keel is arranged in the end cover, and two pairs of first limiting holes are symmetrically formed in the keel;

the limiting ring is sleeved on the transmission shaft, the limiting ring is positioned in the keel, a pair of convex blocks are arranged on the outer wall of the limiting ring, and the convex blocks are symmetrically distributed on the limiting ring;

and a limiting part is inserted in each first limiting hole and used for limiting the rotating angle of the limiting ring.

Furthermore, the keel is made of metal material.

Further, the keel is installed on the cylinder body, and a plurality of contact surfaces are arranged between the interior of the keel and the cylinder body.

Furthermore, a plurality of contact surfaces between the interior of the keel and the cylinder body are completely matched with the shape of the cylinder body and used for increasing the contact area between the keel and the cylinder body of the pneumatic actuator.

Further, be equipped with the arc concave surface in the fossil fragments, pneumatic actuator's cylinder body is equipped with the arc convex surface with the junction of fossil fragments, and the shape phase-match of arc concave surface and arc convex surface for increase fossil fragments and pneumatic actuator's cylinder body's area of contact.

Further, the limiting module is arranged at the idle end of the pneumatic actuator.

Further, the limiting module is arranged at the driving end of the pneumatic actuator.

Further, the pneumatic actuator comprises a pneumatic actuator limiting device.

According to the limiting device of the pneumatic actuator, the driving stroke of the pneumatic actuator can be adjusted, so that the limiting device is suitable for valve switches of different types and similar structures, and has the characteristics of strong impact resistance, long service life, environment-friendly process, simple structure, convenience in assembly and maintenance, low production and maintenance cost and wide application prospect.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and are intended to provide further explanation of the claimed technology.

Drawings

FIG. 1 is an exploded view of a pneumatic actuator stop device according to an embodiment of the present invention;

FIG. 2 is a detail view of a cylinder block according to an embodiment of the present invention;

figure 3 is a detail view of a keel according to an embodiment of the utility model;

FIG. 4 is a perspective view of a pneumatic actuator according to an embodiment of the present invention;

fig. 5 is an internal structural view of a pneumatic actuator according to an embodiment of the present invention (with the pneumatic actuator limiting device hidden).

Detailed Description

The present invention will be further explained by describing preferred embodiments of the present invention in detail with reference to the accompanying drawings.

First, a pneumatic actuator limiting device according to an embodiment of the present invention will be described with reference to fig. 1 to 5, which is used for limiting a working stroke of a pneumatic actuator, and is suitable for pneumatic actuators made of various cylinder bodies, especially for pneumatic actuators made of plastic materials, and has a wide application range.

As shown in fig. 1, the pneumatic actuator limiting device according to the embodiment of the present invention limits the working stroke of the pneumatic actuator by limiting the rotation angle of the transmission shaft 3 of the pneumatic actuator, and includes: the limiting device comprises a limiting module 1 and an end cover 2, wherein the limiting module 1 is sleeved on a transmission shaft 3 of the pneumatic actuator and used for limiting the rotation angle of the transmission shaft 3; the end cover 2 covers the limiting module, and the limiting module 1 is located in the end cover 2.

Specifically, as shown in fig. 1, the limiting module includes: a limiting ring 11, a keel 13 and two pairs of limiting pieces 15; the limiting ring 11 is sleeved on the transmission shaft 3, the outer wall of the ring is provided with a lug 111, and in the embodiment, a pair of lugs 111 is arranged; the keel 13 is sleeved on the transmission shaft 3, the limiting ring 11 is covered in the keel, and a pair of first limiting holes 14 are respectively arranged on two opposite side surfaces of the keel; two pairs of locating parts 15 set up respectively in two pairs of first spacing holes 14 of 13 two opposite side of fossil fragments, when spacing ring 11 rotates certain angle, its lug 111 can be blockked by locating part 15 to through the spacing of locating part 15 to lug 111, realize spacing to the turned angle of transmission shaft 3, then, through adjusting the degree of depth of establishing of inserting of locating part 15 in first spacing hole 14, realize the regulation to the turned angle of transmission shaft 3, in this embodiment, the turned angle that can realize transmission shaft 3 is adjustable at the within range of 85 ~ 95. Moreover, since the two pairs of limiting members 15 are respectively inserted into the symmetrical first limiting holes 14, the impact force of the pair of protrusions 111 can be balanced.

Further, in this embodiment, the keel 13 is made of a metal material, and has high impact resistance.

Further, as shown in fig. 1 to 3, the keel 13 is installed on the cylinder body 4, a plurality of contact surfaces are arranged between the inside of the keel 13 and the cylinder body 4, when the pneumatic actuator works, the transmission shaft 3 rotates, the protruding block 111 of the limiting ring 11 applies force on the limiting part 15, impact force and torsion force are generated on the contact surfaces of the inside of the keel 13 and the cylinder body 4, the stress directions of the contact surfaces are perpendicular to the axial direction of the transmission shaft, the impact force and the torsion force are borne through the contact surfaces in a dispersed manner, and the impact resistance and the torsion resistance of the keel 13 are improved.

Further, as shown in fig. 1 to 3, the contact surfaces of the interior of the keel 13 and the cylinder body 4 are completely matched with the shape of the cylinder body 4, so that the connection mode of the keel 13 and the cylinder body 4 has the characteristic of complete surface contact, the contact area between the keel 13 and the cylinder body 4 is increased, the impact resistance and torsion resistance of the pneumatic actuator limiting device are improved, and the service life of the pneumatic actuator limiting device is prolonged.

Further, as shown in fig. 2-3, an arc concave surface is arranged in the keel 13, an arc convex surface is arranged at the joint of the cylinder body of the pneumatic actuator and the keel, and the arc concave surface is matched with the arc convex surface of the cylinder body 4 of the pneumatic actuator in shape, so that the contact area between the keel 13 and the cylinder body 4 of the pneumatic actuator is increased, and the effect of improving the torsion resistance of the limiting device of the pneumatic actuator is achieved.

In this embodiment, the limiting module 1 may be sleeved at the idle end of the transmission shaft 3, or at the driving end of the transmission shaft 3.

Preferably, the limiting module 1 is arranged at the driving end of the transmission shaft 3, the structure of the pneumatic actuator is not required to be changed, and the height of the pneumatic actuator is not additionally increased, so that when the pneumatic actuator limiting device is installed on the pneumatic actuator, no extra installation space is required, the applicability is greatly improved, the pneumatic actuator limiting device not only can be directly provided for users together with the pneumatic actuator, but also can be used for directly transforming the existing pneumatic actuator of the users, and the economic benefit is remarkable.

Furthermore, the limiting device of the pneumatic actuator further comprises an indicator for indicating the rotation angle of the transmission shaft 3, so that a user can conveniently adjust the rotation angle of the transmission shaft 3.

Specifically, as shown in fig. 1 to 4, end cover 2 covers on fossil fragments 13, fossil fragments 13 are located end cover 2, end cover 2 links to each other with pneumatic actuator's cylinder body 4, in this embodiment, end cover 2 is the plastics material, transmission shaft 3 passes through spacing ring 11 and applies impact force and torsion on locating part 15 and fossil fragments 13, can be cushioned by end cover 2 of plastics material, and can not direct action on cylinder body 4, thereby, no matter cylinder body 4 is the plastics material or the metal material, can both realize effectual protection to cylinder body 4, the life of cylinder body 4 has been guaranteed. Two pairs of second limiting holes 21 are formed in the end cover 2, the two pairs of second limiting holes 21, the two pairs of first limiting holes 14 and the two pairs of limiting pieces 15 correspond to each other one by one, and each limiting piece 15 penetrates through the corresponding second limiting hole 21 and the corresponding first limiting hole 14.

Further, the end cap 2 made of plastic and the keel 13 made of metal can be integrated, and the keel 13 is embedded in the end cap 2.

When the pneumatic actuator works, the transmission shaft 3 drives the limiting ring 11 to rotate, and a pair of lugs 111 arranged on the outer wall of the limiting ring 11 respectively collide with limiting parts 15 arranged on two sides of the impact keel 13 to prevent the transmission shaft 3 from rotating, so that the purpose of limiting the pneumatic actuator is achieved; the user can adjust the position of the limiting member 15 to adjust the rotation angle of the transmission shaft 3.

As described above, in the pneumatic actuator limiting device according to the embodiment of the present invention, the metal keel 13 is mounted on the pneumatic actuator in a manner of combining with the plastic end cap 2, and a pair of limiting members 15 is respectively disposed on two sides of the metal keel 13, so that the effect of balancing the impact force of the keel 13 on the cylinder 4 can be achieved while the rotation angle of the transmission shaft can be adjusted; the shape of the groove on the junction of fossil fragments 13 and cylinder body 4 and the cylinder body 4 matches completely, has increased the area of contact between fossil fragments 13 and the cylinder body 4, has improved pneumatic actuator stop device's the ability of shocking resistance and twisting resistance, has prolonged pneumatic actuator stop device's life.

The pneumatic actuator according to the embodiment of the present invention is described above with reference to fig. 1 to 4. Further, the present invention can also be applied to control a valve switch.

As shown in fig. 5, the pneumatic actuator according to the embodiment of the present invention includes: side cap 5, cylinder body 4, spring 6, piston 7, transmission shaft 3, pneumatic actuator stop device.

Further, as shown in fig. 5, side covers 5 are provided on both sides of the cylinder 4, and springs 6 are provided on inner walls of the side covers 7; piston 7 links to each other with spring 6, is equipped with the rack structure on the piston, and piston 7 meshes with transmission shaft 3 mutually for drive transmission shaft 3 rotates.

When the pneumatic actuator works, the air pressure in the cylinder body 4 rises, the piston 7 is pushed to move towards two sides of the cylinder body 4, and the piston 7 is meshed with the transmission shaft 3 to drive the transmission shaft 3 to rotate so as to output kinetic energy; the limiting device of the pneumatic actuator is sleeved on the transmission shaft 3 and connected with the cylinder body 4 to limit the rotation angle of the transmission shaft 3.

The pneumatic actuator according to the embodiment of the utility model is described above with reference to fig. 1 to 5, and comprises a pneumatic actuator limiting device, so that the driving stroke of the pneumatic actuator can be adjusted, the pneumatic actuator is suitable for valve switches of different types and similar structures, and the pneumatic actuator has the advantages of strong impact resistance, long service life, environment-friendly process, simple structure, convenience in assembly and maintenance, low production and maintenance cost and wide application prospect.

It should be noted that, in the present specification, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the utility model. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the utility model should be determined from the following claims.

Claims

1. A pneumatic actuator limiting device used for limiting the rotation angle of a transmission shaft of a pneumatic actuator is characterized by comprising: the end cover and the limiting module;

the end cover covers the limiting module, and the limiting module is located in the end cover.

2. The pneumatic actuator spacing device of claim 1, wherein said spacing module comprises: the limiting ring, the keel and the two pairs of limiting pieces;

each limiting part is inserted into each first limiting hole and used for limiting the rotating angle of the limiting ring.

3. The pneumatic actuator stop of claim 2, wherein the keel is a metal material.

4. A pneumatic actuator stop according to claim 2 or claim 3 wherein the keel is mounted on the cylinder with a plurality of contact surfaces between the interior of the keel and the cylinder.

5. The pneumatic actuator stop of claim 4 wherein a plurality of contact surfaces between the interior of the keel and the cylinder substantially match the shape of the cylinder for increasing the contact area of the keel and the cylinder of the pneumatic actuator.

6. The pneumatic actuator limiting device according to claim 5, wherein an arc-shaped concave surface is arranged in the keel, an arc-shaped convex surface is arranged at the joint of the cylinder body of the pneumatic actuator and the keel, and the arc-shaped concave surface is matched with the arc-shaped convex surface in shape so as to increase the contact area between the keel and the cylinder body of the pneumatic actuator.

7. The pneumatic actuator limiting device of claim 2 or 3, wherein the limiting module is disposed at an unloaded end of the pneumatic actuator.

8. The pneumatic actuator limiting device according to claim 2 or 3, wherein the limiting module is arranged at a driving end of the pneumatic actuator.

9. A pneumatic actuator comprising the pneumatic actuator limiting device according to any one of claims 1 to 8.