CN214946752U

CN214946752U - Pneumatic actuating mechanism

Info

Publication number: CN214946752U
Application number: CN202120282444.4U
Authority: CN
Inventors: 粟飞; 杨月富; 洪卫; 聂慧磊
Original assignee: Zhejiang Zhongde Automatic Control Valve Co ltd
Current assignee: Zhejiang Zhongde Automatic Control Valve Co ltd
Priority date: 2021-02-01
Filing date: 2021-02-01
Publication date: 2021-11-30
Anticipated expiration: 2031-02-01

Abstract

The utility model relates to the technical field of valve driving power mechanical structure, in particular to a pneumatic actuating mechanism, which comprises an actuator cylinder body, a central shaft is rotationally connected inside the actuator cylinder body, a bidirectional shifting fork is fixedly connected on the central shaft, shifting fork pistons are arranged at the two axial ends of the actuator cylinder body, an optical axis is fixedly connected on each shifting fork piston and is positioned at the U-shaped opening of the bidirectional shifting fork, an anti-lock assembly is also arranged on the corresponding shifting fork piston, when the shifting fork pistons approach to the bidirectional shifting fork along the actuator cylinder body, the anti-lock assembly is in conflict limit with the bidirectional shifting fork, the anti-lock assembly is arranged on the shifting fork pistons, when the shifting fork pistons move to the bidirectional shifting fork to rotate the bidirectional shifting fork, the anti-lock assembly moves to the bidirectional shifting fork along with the shifting fork pistons, and conflicts on the bidirectional shifting fork to limit the rotation angle of the bidirectional shifting fork, the bidirectional shifting fork is prevented from being locked due to excessive rotation.

Description

Pneumatic actuating mechanism

Technical Field

The utility model relates to a valve drive power mechanical structure technical field specifically is 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. Pneumatic actuators are sometimes also equipped with certain auxiliary devices. Commonly used valve positioners and hand wheel mechanisms. 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 the controller. The hand wheel mechanism is used for directly operating the control valve to maintain normal production when the control system has no power supply, no air supply, no output of the controller or failure of the actuating mechanism.

Chinese patent document with application number CN201820660057.8 discloses a 90-degree rotary pneumatic actuator with two shifting forks of small size, which comprises an actuator cylinder body, wherein the inside of the actuator cylinder body is rotatably connected with a central shaft, the central shaft is fixedly connected with two shifting forks, two ends of the actuator cylinder body are provided with two shifting fork type pistons, the two shifting fork type pistons are respectively and fixedly connected with an optical axis, and the optical axis is located at the U-shaped opening of the two shifting forks.

In the process of executing the action, the pneumatic actuator disclosed in the patent document does not limit the rotation angle of the shifting fork, so that the pneumatic actuator is excessively locked in rotation, and the pneumatic actuator fails.

SUMMERY OF THE UTILITY MODEL

To above problem, the utility model provides a pneumatic actuator through set up anti-lock subassembly on shifting fork piston, when shifting fork piston moved the rotatory two-way shift fork to two-way shift fork, anti-lock subassembly moved to two-way shift fork along with shifting fork piston, contradicts on two-way shift fork, carries on spacingly to the rotation angle of two-way shift fork, avoids rotatory excessively, and two-way shift fork is locked.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides a pneumatic actuator, includes the executor cylinder body, the inside rotation of executor cylinder body is connected with the center pin, the two-way shift fork of fixedly connected with on this center pin, the axial both ends of executor cylinder body are provided with the shifting fork formula piston, and equal fixedly connected with optical axis on this shifting fork formula piston, this optical axis is located the U type opening part of two-way shift fork still includes:

and the anti-lock assembly is arranged on the corresponding shifting fork type piston, and when the shifting fork type piston approaches to the bidirectional shifting fork along the actuator cylinder body, the anti-lock assembly is abutted and limited with the bidirectional shifting fork.

As an improvement, the bidirectional shifting forks comprise two groups of symmetrically arranged shifting forks, and the shifting forks are provided with U-shaped openings.

As an improvement, the two-way shifting fork and the side wall parallel to the U-shaped opening are arranged in a plane.

As an improvement, the shifting fork type piston comprises a piston part and a shifting fork part, the piston part is arranged in the actuator cylinder body in a sliding mode, and the shifting fork part is far away from the end part of the piston part and is provided with the optical axis.

As an improvement, a sealing ring is arranged at the position where the piston part is abutted against the side wall of the actuator cylinder body.

In a modification, a central portion of the piston portion is formed to protrude outward toward the center axis side to form a boss portion in which the anti-lock brake unit is fitted.

As an improvement, the anti-lock module comprises:

the buffer rubber pad is arranged inside the bulge part;

the gasket is arranged on the other side of the buffer rubber mat relative to the protruding part and is tightly pressed and limited by a piston push rod driving the shifting fork type piston.

The beneficial effects of the utility model reside in that:

(1) the utility model discloses a set up anti-lock assembly on the shifting fork piston, when the shifting fork piston moved the rotatory two-way shift fork to two-way shift fork, anti-lock assembly moved to two-way shift fork along with the shifting fork piston, contradicted on two-way shift fork, carried on spacing to the rotation angle of two-way shift fork, avoided excessively rotating, two-way shift fork was locked;

(2) the utility model discloses a position with two-way shift fork and anti-lock assembly conflict sets up to the plane for anti-lock assembly forms more stable spacing effect when conflicting with two-way shift fork.

To sum up, the utility model has the advantages of simple structure, anti-lock are effectual, are particularly useful for valve drive power machinery technical field.

Drawings

FIG. 1 is a schematic sectional view of the present invention;

FIG. 2 is a schematic view of the structure of the two-way shifting fork of the present invention;

FIG. 3 is a schematic structural view of the shift fork type piston of the present invention;

FIG. 4 is an enlarged view of the structure at A in FIG. 1;

fig. 5 is an enlarged schematic view of the structure at B in fig. 1.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Example 1:

as shown in fig. 1 to 5, a pneumatic actuator includes an actuator cylinder 1, the actuator cylinder 1 is internally and rotatably connected with a central shaft 2, a two-way shift fork 3 is fixedly connected to the central shaft 2, two axial ends of the actuator cylinder 1 are provided with shift fork type pistons 4, an optical axis 5 is fixedly connected to the shift fork type pistons 4, and the optical axis 5 is located at a U-shaped opening 31 of the two-way shift fork 3, and the pneumatic actuator is characterized by further comprising:

anti-lock braking unit 6, anti-lock braking unit 6 install in corresponding on the shifting fork formula piston 4, shifting fork formula piston 4 is followed executor cylinder body 1 to when two-way shift fork 3 is close to, anti-lock braking unit 6 with it is spacing that two-way shift fork 3 contradicts.

The bidirectional shifting fork 3 comprises two groups of shifting forks 32 which are symmetrically arranged, and the U-shaped opening 31 is formed in each shifting fork 32.

Further, the bidirectional shifting fork 3 and the side wall 33 of the U-shaped opening 31 are arranged in a plane.

Furthermore, the shifting fork type piston 4 comprises a piston part 41 and a shifting fork part 42, the piston part 41 is slidably disposed in the actuator cylinder 1, and the end of the shifting fork part 42 far away from the piston part 41 is provided with the optical axis 5.

Furthermore, a sealing ring 411 is provided at a portion where the piston portion 41 abuts against the side wall of the actuator cylinder 1.

It is noted that the center position of the piston portion 41 is formed to protrude outward toward the center shaft 2 side as a boss portion 412, and the boss portion 412 is fitted with the anti-lock brake unit 6.

And, the anti-lock module 6 includes:

the buffer rubber pad 61, the buffer rubber pad 61 is installed inside the boss 412;

and a spacer 62, wherein the spacer 62 is arranged on the other side of the cushion rubber 61 relative to the boss 412, and the spacer 62 is tightly pressed and limited by a piston push rod 7 driving the shifting fork type piston 4.

It should be noted that, when the shifting fork type piston 4 moves along the inner diameter of the actuator cylinder 1 in the opposite direction, the optical axis 5 moves in the U-shaped opening 31, so that the bidirectional shifting fork 3 rotates, when the bidirectional shifting fork 3 rotates to the limit position, the protruding part 412 on the piston 31 collides with the side wall of the bidirectional shifting fork 3, and the rotation of the bidirectional shifting fork 412 is limited by the elastic compression of the buffer rubber mat 61, thereby preventing the bidirectional shifting fork 412 from being excessively rotated and locked. Simultaneously, adopt the buffering cushion 61 that has elastic expansion as spacing, can make buffering cushion 61 elasticity reset through elasticity, use repeatedly.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a pneumatic actuator, includes executor cylinder body (1), executor cylinder body (1) internal rotation is connected with center pin (2), two-way shift fork (3) of fixedly connected with on this center pin (2), the axial both ends of executor cylinder body (1) are provided with shift fork formula piston (4), and equal fixedly connected with optical axis (5) are gone up in this shift fork formula piston (4), and this optical axis (5) are located U type opening (31) department of two-way shift fork (3), its characterized in that still includes:

anti-lock braking unit spare (6), anti-lock braking unit spare (6) install in corresponding on shifting fork formula piston (4), shifting fork formula piston (4) are followed executor cylinder body (1) to when two-way shift fork (3) are close to, anti-lock braking unit spare (6) with two-way shift fork (3) are contradicted spacingly.

2. A pneumatic actuator according to claim 1, wherein the bidirectional fork (3) comprises two symmetrically arranged fork sets (32), and the fork sets (32) are provided with the U-shaped openings (31).

3. A pneumatic actuator according to claim 2, wherein the bidirectional fork (3) is arranged in a plane with the side wall (33) of the U-shaped opening (31) arranged in parallel.

4. A pneumatic actuator according to claim 1, wherein the fork piston (4) comprises a piston portion (41) and a fork portion (42), the piston portion (41) being slidably arranged in the actuator cylinder (1), the end of the fork portion (42) remote from the piston portion (41) being provided with the optical axis (5).

5. A pneumatic actuator according to claim 4, wherein the piston part (41) is provided with a sealing ring (411) at the location where it abuts against the side wall of the actuator cylinder (1).

6. A pneumatic actuator according to claim 4, wherein said piston portion (41) has a central portion which is formed to protrude outwardly on the side of said central shaft (2) to form a boss portion (412), said boss portion (412) receiving said anti-lock brake unit (6).

7. Pneumatic actuator according to claim 6, wherein the anti-lock braking unit (6) comprises:

the buffer rubber pad (61), the buffer rubber pad (61) is installed inside the bulge part (412);

the gasket (62) is arranged on the other side of the buffer rubber gasket (61) relative to the bulge part (412), and the gasket (62) is tightly pressed and limited by a piston push rod (7) driving the shifting fork type piston (4).