Connecting structure of pneumatic actuator

Abstract

The utility model relates to the technical field of linkage control of pneumatic actuators and valves, and discloses a connecting structure of a pneumatic actuator, which comprises a pipeline, a rotating rod is rotatably connected in the pipeline, and a secondary reset structure is arranged in the pipeline. According to the connecting structure of the pneumatic actuator, the bidirectional cam fixedly connected with the rotating rod and the primary reset unit composed of the fixed block, the first spring and the first movable plate are arranged, so that primary rapid reset of the actuator after the pneumatic power is lost is achieved; a transmission and buffering mechanism composed of a second spring, a second movable plate, a rack and a gear fixedly connected with a rotating rod is arranged, and a sealed cabin formed by the second movable plate and the inner wall of a pipeline communicates with an external air path through an air inlet and a valve, so that secondary controllable buffering from primary resetting to the final position is achieved; the residual kinetic energy of moving parts is effectively absorbed, and the service life and the operation reliability of equipment are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic actuator and valve linkage control technology, specifically a connection structure for a pneumatic actuator. Background Technology

[0002] Pneumatic actuators, as a type of drive device powered by compressed air, are widely used in industrial production process control due to their advantages such as simple structure, rapid action, convenient maintenance and high safety. They are especially used in fields such as chemical, energy and metallurgy where explosion-proof and safety requirements are specified, to drive the opening and closing of various valves.

[0003] In existing devices, when a valve is jammed by a foreign object or reaches the end of its stroke without the operator noticing in time, the torque continuously output by the actuator will be entirely applied to the connecting parts, which can easily lead to the connecting rod twisting or fatigue fracture. Once fracture occurs, the actuator and the driven parts will completely separate, resulting in a loss of control over the valve. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a connection structure for a pneumatic actuator, which has advantages such as smooth reset process, buffering and shock absorption, and accurate end-point positioning. It solves the problems of large impact force, easy equipment vibration, loose connection and inaccurate positioning when the pneumatic actuator terminates and resets.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a connection structure for a pneumatic actuator, including a pipe, a rotating rod rotatably connected inside the pipe, and a two-stage reset structure provided inside the pipe;

[0006] The secondary reset structure includes a bidirectional cam, which is fixedly connected to the outside of the rotating rod. A fixing block is fixedly connected to the inner wall of the pipe. A first spring is fixedly connected to the top of the fixing block. A first movable plate is fixedly connected to the top of the first spring.

[0007] Preferably, a rubber wheel is fixedly connected to the outside of the bidirectional cam, and the rubber wheel is in contact with the first movable plate.

[0008] Preferably, a limiting block is fixedly connected to the outside of the fixing block, and the limiting block is located inside the first spring.

[0009] Preferably, a second spring is fixedly connected to both the left and right inner walls of the pipe, a second movable plate is fixedly connected to one end of the second spring, and a rack is fixedly connected to the outside of the second movable plate.

[0010] Preferably, a gear is fixedly connected to the outside of the rotating rod, and the gear meshes with a rack.

[0011] Preferably, an air inlet is provided on the outside of the pipe, the second movable plate forms a sealed chamber with the inner walls of the left and right sides of the pipe, the pipe is connected to the sealed chamber, and a valve is fixedly connected to the top of the pipe, the valve is connected to the sealed chamber.

[0012] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0013] The connection structure of this pneumatic actuator achieves a rapid first-stage reset after the actuator loses pneumatic power by setting a bidirectional cam fixed to the rotating rod and a primary reset unit consisting of a fixed block, a first spring, and a first movable plate. A transmission and buffering mechanism consisting of a second spring, a second movable plate, a rack, and a gear fixed to the rotating rod is also incorporated. The sealed chamber formed by the second movable plate and the inner wall of the pipe is connected to the external air passage through an air inlet and a valve, achieving a second-stage controllable buffer from the primary reset to the final position, effectively absorbing the remaining kinetic energy of the moving parts. Furthermore, the rubber wheel on the bidirectional cam enhances the flexibility and reduces noise during operation, significantly improving the lifespan and operational reliability of the equipment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a front sectional view of the structure of this utility model;

[0016] Figure 3 This is a rear sectional view of the structure of this utility model;

[0017] Figure 4 for Figure 2 The diagram at point A in the middle.

[0018] In the diagram: 1. Pipe; 2. Rotating rod; 3. Secondary reset structure; 301. Bidirectional cam; 302. Rubber wheel; 303. Fixing block; 304. Limiting block; 305. First spring; 306. First movable plate; 4. Second spring; 5. Second movable plate; 6. Rack; 7. Gear; 8. Air inlet; 9. Valve. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-4The connection structure of a pneumatic actuator in this embodiment includes a pipe 1, a rotating rod 2 rotatably connected inside the pipe 1, and a two-stage reset structure 3 provided inside the pipe 1.

[0021] The secondary reset structure 3 includes a bidirectional cam 301, which is fixedly connected to the outside of the rotating rod 2. A fixing block 303 is fixedly connected to the inner wall of the pipe 1. A first spring 305 is fixedly connected to the top of the fixing block 303. A first movable plate 306 is fixedly connected to the top of the first spring 305.

[0022] A rubber wheel 302 is fixedly connected to the outside of the bidirectional cam 301. The rubber wheel 302 contacts the first movable plate 306. By fixing a rubber wheel 302 to the outside of the bidirectional cam 301 and making it contact the first movable plate 306, it plays a role in buffering noise reduction and protecting the structure. As an elastic medium, the rubber wheel 302 transforms rigid contact into flexible contact, effectively absorbing impact energy, making the entire reset action more stable and quiet, and significantly improving the service life of the structure.

[0023] The fixed block 303 is externally fixedly connected to the limiting block 304. The limiting block 304 is located inside the first spring 305. The limiting block 304 is inserted into the first spring 305, which is equivalent to providing a guide shaft for the spring, constraining its movement trajectory, and ensuring that the first movable plate 306 can only make smooth vertical movements, thereby ensuring the accuracy of the action of the secondary reset structure 3.

[0024] A second spring 4 is fixedly connected to both the left and right inner walls of pipe 1. A second movable plate 5 is fixedly connected to one end of the second spring 4. A rack 6 is fixedly connected to the outside of the second movable plate 5. When the rotating rod 2 needs to rotate, it will drive the second movable plates 5 on both sides to compress their corresponding second springs 4 through the meshing of the gear 7 and the rack 6. The second spring 4 stores energy to reset the rotating rod 2. The key function of the sealed chamber formed by the second movable plate 5 and the inner wall of pipe 1 is that the flow resistance of the medium can be adjusted by the air inlet 8 and valve 9 mentioned in the subsequent claims, thereby providing a controllable damping force to avoid the reset process being too fast or generating impact.

[0025] The rotating rod 2 is externally fixedly connected to a gear 7, which meshes with a rack 6. When the rotating rod 2 rotates, it drives the gear 7 to rotate, and the gear 7 then drives the racks 6 on both sides to move in opposite directions in a straight line, thereby driving the second movable plate 5 to compress or release the second spring 4.

[0026] An air inlet 8 is provided on the outside of the pipe 1. The second movable plate 5 forms a sealed chamber with the inner walls of the left and right sides of the pipe 1. The pipe 1 is connected to the sealed chamber. A valve 9 is fixedly connected to the top of the pipe 1. The valve 9 is connected to the sealed chamber. The air inlet 8 is the channel for the medium, and the valve 9 is an adjustable component. By changing the opening degree of the valve 9, the flow rate of the medium into or out of the sealed chamber can be controlled. When the valve 9 is closed, the flow of the medium is obstructed, the movement speed of the second movable plate 5 slows down, the damping force increases, and the reset process becomes smooth. When the valve 9 is opened, the damping force decreases and the reset speed increases.

[0027] During implementation, the rotating rod 2 is fixedly connected to the valve disc.

[0028] When implementing this procedure, please follow these steps:

[0029] 1) First, reliably connect the air inlet 8 of pipe 1 to the pneumatic control system and ensure that valve 9 is in the open state so that the sealing chambers on both sides of the second movable plate 5 are balanced with the atmospheric pressure. At this time, under the preload of the second spring 4, rack 6 and gear 7 should be in the neutral position of meshing.

[0030] 2) Then compressed air is introduced into the air inlet 8. The gas enters the sealed chamber formed by the second movable plate 5 and the inner wall of the pipe 1, pushing the second movable plate 5 to overcome the elastic force of the second spring 4 and drive the rack 6 to move. The rack 6 then drives the gear 7 that meshes with it, so that the rotating rod 2 fixedly connected to the gear 7 rotates in a predetermined direction, thereby outputting torque.

[0031] 3) Then perform reset and buffer adjustment. When reset is required, cut off the air source. The rotating rod 2 starts to reverse under the action of the rebound force transmitted by the second spring 4 through the rack 6 and gear 7. During this process, the flow rate of air discharged or drawn into the sealed chamber is controlled by adjusting the opening of the valve 9, thereby providing adjustable damping force for the movement of the second movable plate 5, so as to achieve a smooth and controllable secondary buffer reset.

[0032] 4) Finally, the endpoint reset and locking are completed. When the rotating rod 2 approaches the final reset position, the bidirectional cam 301 fixed on it rotates and presses down the first movable plate 306. The first movable plate 306 compresses the first spring 305 until the cam 301 passes the dead point. Under the action of the final restoring force of the first spring 305, the cam 301 is pushed past the top, driving the rotating rod 2 to return precisely and stably and lock at the initial zero position, completing the entire action cycle.

[0033] In summary, the connection structure of this pneumatic actuator, through the setting of a bidirectional cam 301 fixed to the rotating rod 2 and a primary reset unit composed of a fixed block 303, a first spring 305, and a first movable plate 306, achieves a first-stage rapid reset of the actuator after the loss of pneumatic power. By setting a transmission and buffer mechanism composed of a second spring 4, a second movable plate 5, a rack 6, and a gear 7 fixed to the rotating rod 2, and by connecting the sealed chamber formed by the second movable plate 5 and the inner wall of the pipe 1 to the external air passage through the air inlet 8 and the valve 9, a second-stage controllable buffer is achieved from the primary reset to the end position, effectively absorbing the remaining kinetic energy of the moving parts. By setting a rubber wheel 302 on the bidirectional cam 301, the flexibility and noise reduction of the action process are achieved, significantly improving the service life and operational reliability of the equipment.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A connection structure for a pneumatic actuator, comprising a pipe (1), characterized in that: The pipe (1) is rotatably connected to a rotating rod (2), and the pipe (1) is provided with a two-stage reset structure (3). The secondary reset structure (3) includes a bidirectional cam (301), which is fixedly connected to the outside of the rotating rod (2). A fixing block (303) is fixedly connected to the inner wall of the pipe (1). A first spring (305) is fixedly connected to the top of the fixing block (303), and a first movable plate (306) is fixedly connected to the top of the first spring (305).

2. The connection structure of a pneumatic actuator according to claim 1, characterized in that: A rubber wheel (302) is fixedly connected to the outside of the bidirectional cam (301), and the rubber wheel (302) contacts the first movable plate (306).

3. The connection structure of a pneumatic actuator according to claim 1, characterized in that: The fixed block (303) is externally fixedly connected to a limiting block (304), which is located inside the first spring (305).

4. The connection structure of a pneumatic actuator according to claim 1, characterized in that: The left and right inner walls of the pipe (1) are fixedly connected with a second spring (4), one end of the second spring (4) is fixedly connected with a second movable plate (5), and the outside of the second movable plate (5) is fixedly connected with a rack (6).

5. The connection structure of a pneumatic actuator according to claim 4, characterized in that: The rotating rod (2) is externally fixedly connected to a gear (7), which meshes with a rack (6).

6. The connection structure of a pneumatic actuator according to claim 4, characterized in that: An air inlet (8) is provided on the outside of the pipe (1). The second movable plate (5) and the inner walls of the left and right sides of the pipe (1) form a sealed chamber. The pipe (1) is connected to the sealed chamber. A valve (9) is fixedly connected to the top of the pipe (1). The valve (9) is connected to the sealed chamber.

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