A feedback device for a pneumatic valve

Abstract

The application relates to a feedback device for a pneumatic valve, and relates to the technical field of pneumatic valves, which comprises a switch box body and a switch box cover, the switch box cover is installed on the switch box body, a rotating shaft is rotatably installed on the switch box body, a first cam and a second cam are arranged on the rotating shaft, a limit switch is installed in the switch box body, the limit switch corresponds to the first cam and the second cam, the first cam is in contact with one group of limit switches to feed back the fully-open state of the pneumatic valve, the second cam is in contact with the other group of limit switches to feed back the fully-closed state of the pneumatic valve, a positioning assembly is arranged on the rotating shaft, and the positioning assembly is used for mounting the two groups of cams on the rotating shaft. The application omits the installation of the cams through screws, reduces the relative rotation between the cams and the rotating shaft, and enables the pneumatic valve to be normally used.

Description

Technical Field

[0001] This application relates to the field of pneumatic valve technology, and in particular to a feedback device for pneumatic valves. Background Technology

[0002] Currently, pneumatic valves are automated valves that use compressed air as a power source to control the on / off state or regulate the flow of fluids (such as gases and liquids). Their core components include a pneumatic actuator (such as a cylinder or diaphragm) and a valve body (such as a ball valve, butterfly valve, or gate valve). Air pressure drives the valve core to move, achieving rapid response and precise control. Pneumatic valves are widely used in industries such as petroleum, chemical, power, and water treatment. They have advantages such as simple structure, convenient maintenance, and explosion-proof safety. They are often used in conjunction with solenoid valves, positioners, and feedback devices (such as limit switches or position sensors) to meet the needs of automation systems.

[0003] Pneumatic valves are widely used in industrial automation control systems, and real-time monitoring of their on / off status is crucial for process safety and efficiency. Traditional valve status feedback methods mainly include mechanical limit switches, magnetic proximity switches, and potentiometers or encoders. Mechanical limit switches trigger microswitches through cam or lever mechanisms to output open / close signals.

[0004] When installing the cam, fit the cam onto the shaft, then rotate the cam to a preset angle, and then pass one end of the screw through the cam, with the end of the screw passing through the cam pressing against the shaft.

[0005] Regarding the aforementioned technologies, the inventors believe that the cam is mounted on the rotating shaft with screws. As the rotating shaft rotates, relative rotation between the cam and the rotating shaft is likely to occur, which in turn affects the normal use of the pneumatic valve. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a feedback device for pneumatic valves, which solves the technical problem that when a cam is mounted on a rotating shaft by a screw, relative rotation between the cam and the rotating shaft easily occurs as the rotating shaft rotates, thereby affecting the normal use of the pneumatic valve.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A feedback device for a pneumatic valve includes a switch box body and a switch box cover. The switch box cover is mounted on the switch box body. A rotating shaft is rotatably mounted on the switch box body. A first cam and a second cam are provided on the rotating shaft. Limit switches are installed inside the switch box body. The limit switches correspond to the first cam and the second cam. The first cam contacts one set of limit switches to provide feedback on the fully open state of the pneumatic valve, and the second cam contacts the other set of limit switches to provide feedback on the fully closed state of the pneumatic valve. A positioning assembly is provided on the rotating shaft to mount the two sets of cams on the rotating shaft.

[0009] Furthermore, the positioning component includes a first positioning tooth, which is sleeved on the rotating shaft; a first limiting tooth is formed inside the first cam; the first cam is sleeved on the first positioning tooth, and the first positioning tooth meshes with the first limiting tooth; a second positioning tooth is formed on the first cam; a second limiting tooth is formed inside the second cam, and the second limiting tooth meshes with the second positioning tooth.

[0010] Furthermore, a first limiting surface is provided on the rotating shaft, and a second limiting surface is provided on the first positioning tooth, with the first limiting surface abutting against the second limiting surface.

[0011] Furthermore, the rotating shaft is provided with a positioning groove, and two sets of positioning grooves are provided on both sides of the first cam and the second cam. The rotating shaft is provided with a retaining ring, and the retaining ring is provided with a retaining groove. The retaining ring engages with the positioning groove, and the first cam and the second cam are located between the two sets of retaining rings.

[0012] Furthermore, a support spring is provided on the rotating shaft, and the support spring abuts against the second cam and the retaining ring on one side.

[0013] Furthermore, one end of the rotating shaft extends through the switch box cover, and an indicator block is installed at the end of the rotating shaft extending through the switch box cover. A protective cover is installed on the switch box cover, and the protective cover covers the indicator block.

[0014] Furthermore, the rotating shaft is eccentrically positioned on the switch box body, and a wiring area is formed on one side of the rotating shaft.

[0015] In summary, this application includes at least one of the following beneficial technical effects of a feedback device for pneumatic valves:

[0016] 1. In use, the first cam and the second cam are mounted on the rotating shaft through the positioning assembly. As the rotating shaft rotates, when the first cam and the second cam contact the corresponding limit switch, feedback is given on whether the valve is in the fully open or fully closed state. This eliminates the need to install the cams with screws, reduces the relative rotation between the cams and the rotating shaft, and enables the pneumatic valve to be used normally.

[0017] 2. The arrangement of the first positioning tooth and the first limiting tooth on the first cam, the second positioning tooth and the second limiting tooth on the second cam, and the support spring improves the ease of adjustment of the first cam and the second cam;

[0018] 3. By setting the first limiting surface on the rotating shaft, the second limiting surface on the first positioning tooth, and the positioning groove and retaining ring on the rotating shaft, the stability of the position of the first cam and the second cam on the rotating shaft is improved. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a feedback device for pneumatic valves, which is the main feature of this application.

[0020] Figure 2 This is an exploded view of the switch box cover structure, which is the main feature of this application.

[0021] Figure 3 This is a schematic diagram of the main indicator block structure provided in this application;

[0022] Figure 4 This is an exploded view of the first and second cam structures, which are the main components of this application.

[0023] Reference numerals in the attached drawings: 1. Switch box body; 11. Switch box cover; 12. Wiring area; 13. Limit cover; 14. Indicator area; 15. Protective cover; 2. Rotating shaft; 21. Positioning groove; 22. Snap ring; 23. Snap groove; 24. First limiting surface; 25. Indicator block; 3. First cam; 31. First limiting tooth; 32. Second positioning tooth; 4. Second cam; 41. Second limiting tooth; 5. Positioning assembly; 51. First positioning tooth; 52. Second limiting surface; 53. Support spring; 6. Limit switch. Detailed Implementation

[0024] In order to make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0025] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0026] This application discloses a feedback device for pneumatic valves.

[0027] Reference Figures 1-3 A feedback device for a pneumatic valve includes a switch box body 1 and a switch box cover 11, which are locked together by bolts. A rotating shaft 2 is mounted on the switch box body 1, and a first cam 3 and a second cam 4 are mounted on the shaft 2. A positioning assembly 5 is also mounted on the shaft 2 to hold the first cam 3 and the second cam 4 in place. Limit switches 6 are mounted on the switch box body 1, with two sets of limit switches 6 corresponding to the first cam 3 and the second cam 4. As the shaft 2 rotates, when the first cam 3 contacts the limit switch 6, the pneumatic valve is fully open; when the second cam 4 contacts the limit switch 6, the pneumatic valve is fully closed.

[0028] When the rotating shaft 2 is installed inside the switch box body 1, in order to improve the boundary line of the wire installation inside the switch box body 1, the rotating shaft 2 is eccentrically set inside the switch box body 1, and a wiring area 12 is formed on one side of the rotating shaft 2, which improves the convenience of wiring the switch box body 1.

[0029] Reference Figures 3-4 To improve the stability of the first cam 3 and the second cam 4 mounted on the rotating shaft 2, a positioning groove 21 is provided on the rotating shaft 2. The positioning groove 21 is generally annular, and two sets of positioning grooves 21 are spaced apart along the axis of the rotating shaft 2. A retaining ring 22 is provided on the rotating shaft 2. The retaining ring 22 is generally annular, and the retaining ring 22 corresponds to the two sets of positioning grooves 21. The two sets of retaining rings 22 are arranged in parallel and spaced apart. A retaining groove 23 is provided on the retaining ring 22. In use, the retaining ring 22 is engaged with the positioning groove 21 of the rotating shaft 2 through the retaining groove 23, and the first cam 3 and the second cam 4 are located between the two sets of retaining rings 22.

[0030] The positioning component 5 includes a first positioning tooth 51, which is located between two sets of retaining rings 22 and is sleeved on the rotating shaft 2. Further, the rotating shaft 2 has a first limiting surface 24, with two sets of first limiting surfaces 24 spaced apart and arranged in parallel. A second limiting surface 52 is provided on the inner side of the first positioning tooth 51, with two sets of second limiting surfaces 52 spaced apart and arranged in parallel. In use, when the first positioning tooth 51 is sleeved on the rotating shaft 2, the first limiting surface 24 and the second limiting surface 52 abut against each other, thereby preventing relative rotation between the first positioning tooth 51 and the rotating shaft 2.

[0031] The inner side of the first cam 3 has a first limiting tooth 31. When in use, the first cam 3 is sleeved on the rotating shaft 2 and the first cam 3 is sleeved on the first positioning tooth 51. The first limiting tooth 31 on the first cam 3 meshes with the first positioning tooth 51. When in use, the rotating shaft 2 drives the first positioning tooth 51 to rotate, and the first positioning tooth 51 drives the first cam 3 to rotate.

[0032] A second positioning tooth 32 is formed on the first cam 3, and the second positioning tooth 32 is integrally formed with the first cam 3 and is also sleeved on the rotating shaft 2. The second cam 4 is sleeved on the rotating shaft 2, and at the same time, the second cam 4 is sleeved on the second positioning tooth 32. A second limiting tooth 41 is formed on the inner side of the second cam 4, and the second limiting tooth 41 meshes with the second positioning tooth 32. In order to improve the stability between the first cam 3 and the second cam 4, a support spring 53 is provided between the retaining ring 22 and the second cam 4. The support spring 53 is sleeved on the rotating shaft 2, and one end of the support spring 53 abuts against the retaining ring 22, and the other end abuts against the second cam 4, thereby reducing the displacement of the first cam 3 and the second cam 4 on one side of the rotating shaft 2 in the axial direction during rotation.

[0033] When it is necessary to adjust the angle between the first cam 3 and the second cam 4, the first cam 3 and the second cam 4 are lifted towards the side closer to the support spring 53. At this time, the support spring 53 is in a compressed state. After the positions of the first cam 3 and the second cam 4 are adjusted, the first cam 3 is engaged with the first positioning tooth 51, and the second cam 4 is engaged with the second positioning tooth 32. Then, the support spring 53 is pressed back against the second cam 4. By stacking the first cam 3 and the second cam 4 together, the distance between the two sets of limit switches 6 installed in the switch box body 1 can be reduced, improving the utilization rate of the space inside the switch box body 1.

[0034] Reference Figure 2 One end of the rotating shaft 2 protrudes from the switch box cover 11, and an indicator block 25 is installed on the end of the rotating shaft 2 protruding from the switch box cover 11. The indicator block 25 indicates whether it is open or closed. Furthermore, a limit cover 13 is installed on the switch box cover 11, and the limit cover 13 has an indicator area 14. In use, as the rotating shaft 2 rotates, the indicator block 25 rotates inside the limit cover 13. When the first cam 3 contacts the limit switch 6, the open position on the indicator block 25 moves into the indicator area 14 of the limit cover 13. At the same time, the closed position is blocked by the limit cover 13. When the second cam 4 contacts the limit switch 6, the closed position on the indicator block 25 moves into the indicator area 14 of the limit cover 13.

[0035] A protective cover 15 is provided on the switch box cover 11. The protective cover 15 is made of transparent plastic. The protective cover 15 protects the indicator block 25 and reduces the amount of external dust that enters the switch box body 1 through the indicator block 25.

[0036] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A feedback device for a pneumatic valve, comprising a switch box body (1) and a switch box cover (11), wherein the switch box cover (11) is mounted on the switch box body (1), and a rotating shaft (2) is rotatably mounted on the switch box body (1), characterized in that: The rotating shaft (2) is provided with a first cam (3) and a second cam (4). The switch box body (1) is equipped with a limit switch (6). The limit switch (6) corresponds to the first cam (3) and the second cam (4). The first cam (3) contacts one of the limit switches (6) to provide feedback on the fully open state of the pneumatic valve. The second cam (4) contacts the other set of limit switches (6) to provide feedback on the fully closed state of the pneumatic valve. The rotating shaft (2) is provided with a positioning component (5). The positioning component (5) is used to install the two sets of cams on the rotating shaft (2).

2. The feedback device for a pneumatic valve according to claim 1, characterized in that: The positioning component (5) includes a first positioning tooth (51), which is sleeved on the rotating shaft (2). A first limiting tooth (31) is formed in the first cam (3), which is sleeved on the first positioning tooth (51) and the first positioning tooth (51) meshes with the first limiting tooth (31). A second positioning tooth (32) is formed on the first cam (3), and a second limiting tooth (41) is formed in the second cam (4), which meshes with the second positioning tooth (32).

3. A feedback device for a pneumatic valve according to claim 2, characterized in that: The rotating shaft (2) has a first limiting surface (24) and the first positioning tooth (51) has a second limiting surface (52). The first limiting surface (24) and the second limiting surface (52) abut against each other.

4. A feedback device for a pneumatic valve according to claim 3, characterized in that: The rotating shaft (2) is provided with a positioning groove (21). The positioning groove (21) is located on both sides of the first cam (3) and the second cam (4) and is provided with two sets of grooves. The rotating shaft (2) is provided with a retaining ring (22). The retaining ring (22) is provided with a retaining groove (23). The retaining ring (22) is engaged with the positioning groove (21). The first cam (3) and the second cam (4) are located between the two sets of retaining rings (22).

5. A feedback device for a pneumatic valve according to claim 4, characterized in that: A support spring (53) is provided on the rotating shaft (2), and the support spring (53) abuts against the second cam (4) and the retaining ring (22) on one side.

6. A feedback device for a pneumatic valve according to claim 1, characterized in that: One end of the rotating shaft (2) extends through the switch box cover (11), and an indicator block (25) is installed on the end of the rotating shaft (2) extending through the switch box cover (11). A protective cover (15) is installed on the switch box cover (11), and the protective cover (15) covers the indicator block (25).

7. A feedback device for a pneumatic valve according to claim 1, characterized in that: The rotating shaft (2) is eccentrically positioned on the switch box body (1), and a wiring area (12) is formed on one side of the rotating shaft (2).

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