Shifting fork type double-acting pneumatic actuator

Abstract

The utility model relates to the technical field of pneumatic actuators, and discloses a shifting fork type double-acting pneumatic actuator which is used for being connected with a valve to control opening and closing of the valve and comprises a shell, shifting fork type double-acting mechanisms are arranged inside and outside the shell, and a pneumatic mechanism is arranged outside the shell. And a quick connecting mechanism which is quickly combined and mounted with the shifting fork type double-acting mechanism is arranged outside the pneumatic mechanism. The shifting fork type double-acting mechanisms are arranged inside and outside the shell, in the using process, stable and dynamic opening and closing of the valve can be achieved, opening and closing of the valve are achieved in a pneumatic mode through cooperation of the pneumatic mechanism, the problem that when the valve is closed, the force is too large, and consequently the valve is damaged is solved, and the service life of the valve is prolonged. The quick connecting mechanism which is quickly combined and mounted with the pneumatic mechanism is arranged outside the shell, so that air cylinders of different models and specifications can be quickly connected with the shell according to valves in different use scenes in the use process.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic actuators, in particular to a scotch yoke type double-acting pneumatic actuator. Background Art

[0002] The actuator and regulating mechanism of the pneumatic actuator are a unified whole. Its actuators include diaphragm type, piston type, scotch yoke type and gear rack type. Among them, the scotch yoke type pneumatic actuator is mainly suitable for valves with a 90° rotation angle, such as ball valves, butterfly valves, plug valves, etc., and is widely used in industrial automation control systems, such as petrochemical, electric power, metallurgy, water treatment and other industries.

[0003] The general operation process of the existing scotch yoke pneumatic actuator is to install the actuator on the top of the valve, use the cylinder to allow compressed air to enter the cylinder to push the double pistons to make linear motion, and the pistons are connected to the U-shaped groove design of the scotch yoke through the piston pin, converting the linear motion into the rotational motion of the scotch yoke, and the rotation of the scotch yoke further drives the output shaft to rotate, thereby realizing the switching control of the valve. Although the existing scotch yoke pneumatic actuator can complete the opening and closing of the valve, in actual application, when the valve needs to be closed, the existing scotch yoke pneumatic actuator needs to first discharge the compressed air in the cylinder, and then use the set spring to rebound to drive the connecting rod to push the valve to close. Due to the preset spring The rebound force is difficult to control, causing the spring to rebound too quickly or too slowly. When it rebounds too quickly, the instantaneous elastic force generated is large, which can easily cause damage to the valve. When it rebounds slowly, it can easily cause the valve to close untimely or not tightly. Moreover, since the force required to open and close the valve is relatively different in different usage scenarios, the required cylinder specifications are also different. The cylinder of the existing scotch fork type pneumatic actuator is an integrated arrangement, which makes it difficult to quickly disassemble and replace the cylinder according to different usage requirements, and there is a problem of poor practicality. Therefore, in view of the shortcomings of the existing scotch fork type pneumatic actuator in actual applications, we urgently need to improve a scotch fork type double-acting pneumatic actuator to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a scotch fork type double-acting pneumatic actuator, which uses pneumatics to open and close the valve to prevent valve damage, and by setting a quick connection mechanism between cylinders of different models and specifications and the housing, solves the problems raised in the above background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a scotch fork double-acting pneumatic actuator, used to connect with a valve to control the opening and closing of the valve, comprising a shell, a scotch fork double-acting mechanism is arranged inside and outside the shell, a pneumatic mechanism is arranged outside the shell, and a quick connection mechanism is arranged outside the pneumatic mechanism for quick assembly and installation with the scotch fork double-acting mechanism.

[0006] The fork-type double-acting mechanism includes a rubber ring-type air exchange port, a connecting fork and a connecting head. The rubber ring-type air exchange port is arranged on both sides of the interior of the shell. The connecting fork is rotatably installed inside the shell. A connecting pin is provided on the top of the connecting fork, a piston pin is provided on the outside of the connecting fork, a connecting piston is provided on the outside of the piston pin, and the connecting head is installed on the outside of the shell, which is convenient for realizing dynamic opening and closing of the valve in actual application.

[0007] Preferably, two groups of piston pins and connecting pistons are provided, and the two groups of piston pins and connecting pistons are symmetrically arranged outside the connecting fork. A mounting seat combined with the valve is provided at the bottom of the connecting fork to facilitate more stable opening and closing of the valve.

[0008] Preferably, the pneumatic mechanism includes an external connecting frame, which is fixedly mounted on the outside of the outer shell, a cylinder is provided inside the external connecting frame, a ventilation pipe is provided outside the cylinder, and connecting pipes for air inlet and outlet are provided outside the cylinder, so as to facilitate the use of pneumatics to open and close the valve and prevent the valve from being damaged due to excessive closing force.

[0009] Preferably, two groups of the external connecting frames are provided, and the two groups of the external connecting frames are symmetrically arranged outside the shell to facilitate achieving a more stable double-action effect.

[0010] Preferably, the quick connection mechanism includes a fixed tube and a plug-in tube, the fixed tube is arranged outside the connecting head, a sleeve is movably installed on the outside of the fixed tube, a return spring is arranged inside the sleeve, a locking ball is movably installed inside the fixed tube, and the plug-in tube is fixedly installed on the outside of the ventilation pipe, so as to facilitate the quick connection of cylinders of different models and specifications with the outer shell according to valves in different usage scenarios.

[0011] Preferably, a mounting hole is provided inside the fixed tube at a position corresponding to the locking ball, a sliding groove is provided between the fixed tube and the sleeve tube, the return spring is arranged in the sliding groove, the top of the return spring is fixedly connected to the inside of the sleeve tube, the bottom of the return spring is fixedly connected to the inside of the sliding groove, an abutment block is installed inside the sleeve tube at a position corresponding to the locking ball, and a groove for contact of the locking ball is provided inside the plug-in tube, so as to facilitate quick installation and disassembly.

[0012] Compared with the prior art, the present invention provides a scotch yoke double-acting pneumatic actuator with the following beneficial effects:

[0013] 1. The scotch fork double-acting pneumatic actuator can realize stable dynamic opening and closing of the valve during use by arranging the scotch fork double-acting mechanism inside and outside the shell. And through the cooperation of the pneumatic mechanism, the valve is opened and closed by pneumatic means, which prevents the valve from being damaged due to excessive force when closing the valve.

[0014] 2. This scotch yoke double-acting pneumatic actuator has a quick connection mechanism on the outside of the housing for rapid assembly and installation with the pneumatic mechanism. During use, cylinders of different models and specifications can be quickly connected to the housing according to valves in different usage scenarios, thereby improving the opening and closing efficiency of the valve and enhancing the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the three-dimensional structure of the scotch yoke type double-acting pneumatic actuator.

[0016] Figure 2 This is a schematic diagram of the three-dimensional structure of the toggle-type double-acting mechanism in this scotch-yoke double-acting pneumatic actuator.

[0017] Figure 3 This is a schematic diagram of the partially disassembled structure of the toggle-type double-acting mechanism in this scotch-yoke double-acting pneumatic actuator.

[0018] Figure 4 This is a schematic diagram of the three-dimensional structure of the pneumatic mechanism in this scotch yoke type double-acting pneumatic actuator.

[0019] Figure 5 This is a schematic diagram of the three-dimensional structure of the quick connection mechanism in this scotch yoke type double-acting pneumatic actuator.

[0020] Figure 6 This is a schematic diagram of the disassembled structure of the quick connection mechanism in this scotch yoke double-acting pneumatic actuator.

[0021] In the figure: 1. Housing; 2. Shift fork type double-acting mechanism; 201. Rubber ring type air exchange port; 202. Connecting shift fork; 203. Connecting pin; 204. Piston pin; 205. Connecting piston; 206. Connecting head; 3. Pneumatic mechanism; 301. External connecting frame; 302. Cylinder; 303. Breathing pipe; 304. Connecting pipe; 4. Quick connecting mechanism; 401. Fixing pipe; 402. Socket; 403. Return spring; 404. Locking ball; 405. Plug-in pipe. DETAILED DESCRIPTION

[0022] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is described in further detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] Example 1: Please refer to Figure 1-Figure 3The utility model provides a technical solution: a scotch fork double-acting pneumatic actuator, which is used to connect with a valve to control the opening and closing of the valve, including a shell 1, a scotch fork double-acting mechanism 2 is arranged inside and outside the shell 1, a pneumatic mechanism 3 is arranged outside the shell 1, and a quick connection mechanism 4 is arranged outside the pneumatic mechanism 3 for quick assembly and installation with the scotch fork double-acting mechanism 2.

[0024] The fork-type double-acting mechanism 2 includes a rubber ring-type air exchange port 201, a connecting fork 202 and a connecting head 206. The rubber ring-type air exchange port 201 is arranged on both sides of the inside of the shell 1, and the connecting fork 202 is rotatably installed inside the shell 1. A connecting pin 203 is provided on the top of the connecting fork 202, a piston pin 204 is provided on the outside of the connecting fork 202, and a connecting piston 205 is provided on the outside of the piston pin 204. The connecting head 206 is installed on the outside of the shell 1, which is convenient for realizing dynamic opening and closing of the valve in actual application.

[0025] Furthermore, two groups of piston pins 204 and connecting pistons 205 are provided, and the two groups of piston pins 204 and connecting pistons 205 are symmetrically arranged outside the connecting fork 202. A mounting seat combined with the valve is provided at the bottom of the connecting fork 202 to facilitate more stable opening and closing of the valve.

[0026] Example 2: Please refer to Figure 4 , and combined with Example 1, it is further obtained that the pneumatic mechanism 3 includes an external connecting frame 301, the external connecting frame 301 is fixedly installed on the outside of the shell 1, a cylinder 302 is provided inside the external connecting frame 301, a ventilation pipe 303 is provided outside the cylinder 302, and a connecting pipe 304 for air inlet and outlet is provided outside the cylinder 302, which is convenient for using pneumatics to open and close the valve and prevent the valve from being damaged by excessive closing force.

[0027] Furthermore, two groups of external connecting frames 301 are provided, and the two groups of external connecting frames 301 are symmetrically arranged outside the housing 1 to facilitate achieving a more stable dual-action effect.

[0028] Example 3: Please refer to Figure 5-Figure 6 , and combined with Example 1 and Example 2, it is further obtained that the quick connection mechanism 4 includes a fixed tube 401 and a plug tube 405, the fixed tube 401 is arranged outside the connecting head 206, a sleeve tube 402 is movably installed on the outside of the fixed tube 401, a return spring 403 is arranged inside the sleeve tube 402, a locking ball 404 is movably installed inside the fixed tube 401, and the plug tube 405 is fixedly installed on the outside of the vent pipe 303, so as to facilitate the rapid connection of cylinders of different models and specifications with the housing according to valves in different usage scenarios.

[0029] Furthermore, a mounting hole is provided inside the fixed tube 401 at a position corresponding to the locking ball 404, a sliding groove is provided between the fixed tube 401 and the sleeve tube 402, a return spring 403 is arranged in the sliding groove, the top of the return spring 403 is fixedly connected to the inside of the sleeve tube 402, and the bottom of the return spring 403 is fixedly connected to the inside of the sliding groove, an abutment block is installed inside the sleeve tube 402 at a position corresponding to the locking ball 404, and a groove for contact of the locking ball 404 is provided inside the plug-in tube 405, which facilitates quick installation and disassembly.

[0030] In actual operation, when it is necessary to control the valve switch, the valve can be assembled and installed through the mounting seat set at the bottom of the connecting fork 202, and then the sleeve 402 can be pulled toward the connecting head 206 to release the locking block from the locking ball 404. Then, the plug-in tube 405 of the vent pipe 303 can be plugged into the interior of the fixed tube 401. After the plugging is completed, the sleeve 402 is released, and under the reset action of the reset spring 403, the sleeve 402 can be restored to its initial position, so that the set abutment block can resume its abutment against the locking ball 404, and the locking ball 404 moves inward and forms a connection with the groove inside the plug-in tube 405. This completes the locking of the position of the plug tube 405 and the quick installation of the vent tube 303 and the connector 206. Subsequently, the cylinder 302 on the outside of the shell 1 can be operated. Under the action of the connecting tube 304, compressed air enters the inside of the shell 1, squeezing the connecting piston 205 on one side. At the same time, the cylinder 302 on the other side can be operated to perform exhaust operation to rotate the set connecting fork 202 to open the valve. When it needs to be closed, the cylinders 302 on both sides can be operated oppositely to achieve double action on the pneumatic actuator and better open and close the valve. Compared with the traditional spring-mounted valve, the air pressure control can prevent the valve from being damaged by excessive closing force.

[0031] The above embodiments merely represent one or several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A scotch fork type double-acting pneumatic actuator for connecting to a valve to control the opening and closing of the valve, comprising a housing (1), characterized in that: A fork-type double-acting mechanism (2) is provided inside and outside the housing (1), a pneumatic mechanism (3) is provided outside the housing (1), and a quick connection mechanism (4) for quick assembly and installation with the fork-type double-acting mechanism (2) is provided outside the pneumatic mechanism (3); The shift fork type double-acting mechanism (2) comprises a rubber ring type air exchange port (201), a connecting shift fork (202) and a connecting head (206); the rubber ring type air exchange port (201) is arranged on both sides inside the housing (1); the connecting shift fork (202) is rotatably mounted inside the housing (1); a connecting pin (203) is arranged on the top of the connecting shift fork (202); a piston pin (204) is arranged outside the connecting shift fork (202); a connecting piston (205) is arranged outside the piston pin (204); and the connecting head (206) is mounted outside the housing (1).

2. A scotch fork double-acting pneumatic actuator according to claim 1, characterized in that: The piston pin (204) and the connecting piston (205) are provided in two groups, and the two groups of the piston pin (204) and the connecting piston (205) are symmetrically arranged outside the connecting fork (202). The bottom of the connecting fork (202) is provided with a mounting seat combined with the valve.

3. The scotch yoke double-acting pneumatic actuator according to claim 1, characterized in that: The pneumatic mechanism (3) comprises an external connecting frame (301), the external connecting frame (301) being fixedly mounted on the outside of the housing (1), a cylinder (302) being provided inside the external connecting frame (301), a vent pipe (303) being provided outside the cylinder (302), and a connecting pipe (304) for air inlet and outlet being provided outside the cylinder (302).

4. The scotch yoke double-acting pneumatic actuator according to claim 3, characterized in that: Two groups of the external connecting frames (301) are provided, and the two groups of the external connecting frames (301) are symmetrically arranged outside the housing (1).

5. The scotch yoke double-acting pneumatic actuator according to claim 1, characterized in that: The quick connection mechanism (4) comprises a fixed tube (401) and a plug tube (405); the fixed tube (401) is arranged outside the connector (206); a sleeve tube (402) is movably mounted outside the fixed tube (401); a return spring (403) is arranged inside the sleeve tube (402); a locking ball (404) is movably mounted inside the fixed tube (401); and the plug tube (405) is fixedly mounted outside the vent tube (303).

6. The scotch yoke double-acting pneumatic actuator according to claim 5, characterized in that: A mounting hole is provided inside the fixed tube (401) at a position corresponding to the locking ball (404), a sliding groove is provided between the fixed tube (401) and the sleeve tube (402), the reset spring (403) is arranged in the sliding groove, the top of the reset spring (403) is fixedly connected to the inside of the sleeve tube (402), the bottom of the reset spring (403) is fixedly connected to the inside of the sliding groove, an abutment block is installed inside the sleeve tube (402) at a position corresponding to the locking ball (404), and a groove for contact of the locking ball (404) is provided inside the plug-in tube (405).

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