Switch indicating device controlled by pneumatic valve

Abstract

The invention relates to the technical field of pneumatic valves, in particular to a pneumatic valve control switch indicating device which comprises a valve shell, the valve shell is provided with an inlet end and an outlet end, the inlet end communicates with the outlet end, a valve is formed at the communicating position, and the valve shell is slidably connected with a valve rod; the pneumatic actuator is connected with the valve shell, a piston is arranged in the pneumatic actuator in a sliding mode, and the pneumatic actuator is used for driving the valve rod to move so that the valve can be opened or closed; the display mechanism is used for visually displaying opening or closing of the valve; the box body is connected with the valve shell, the box body is connected with a switch assembly, the switch assembly is electrically connected with the display mechanism, and the switch assembly is used for monitoring the opening or closing state of the valve and transmitting an opening or closing signal to the display mechanism. The valve state can be confirmed in time, and the working efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of pneumatic valves, and in particular to a switch indicating device for controlling a pneumatic valve. Background Art

[0002] With the improvement of industrial automation, pneumatic valves, as an efficient and safe fluid control equipment, are widely used in many industries such as chemical, pharmaceutical, and food processing. Pneumatic valves use compressed air as a power source to control the opening and closing of valves. The compressed air acts on the pneumatic actuator through the connecting pipeline. The pneumatic actuator receives the control signal, thereby driving the valve to open or close quickly, realizing the control of the medium in the pipeline.

[0003] At present, the common means of monitoring the status of pneumatic valves mostly use mechanical pointer instruments. The pointer instruments are installed on the outside, and it is easy for the pointer to not deflect or swing back and forth. In addition, pointer instruments usually require manual reading to obtain data. This reading method has limitations. For example, data must be manually entered into the computer for storage and transmission. At the same time, the accuracy and precision of the readings depend on the subjective consciousness of the reading personnel. It is easy for the pointer instrument to point to offset or the operator to read incorrectly, and the valve status cannot be confirmed in time. The operator needs to spend extra time and steps to check and confirm, resulting in low work efficiency. Summary of the invention

[0004] In order to confirm the valve status in time and improve work efficiency, the present application provides a switch indicating device for pneumatic valve control.

[0005] The present application provides a switch indicating device for pneumatic valve control, which adopts the following technical solution: A switch indicating device for pneumatic valve control, comprising: A valve housing, wherein the valve housing is provided with an inlet end and an outlet end, the inlet end is connected to the outlet end, and a valve is formed at the connection point, and the valve housing is slidably connected to a valve stem; A pneumatic actuator connected to the valve housing, with a piston slidably arranged inside, the pneumatic actuator is used to drive the valve stem to move, so as to open or close the valve; Display mechanism, used for visually displaying the opening or closing of the valve; A box body is connected to the valve housing, the box body is connected to a switch assembly, the switch assembly is electrically connected to the display mechanism, and the switch assembly is used to monitor the open or closed state of the valve and transmit the open or closed signal to the display mechanism.

[0006] By adopting the above technical solution, the pneumatic actuator drives the valve stem to open or close the valve, the switch component monitors the open or closed state of the valve, and transmits the open or closed state signal to the display mechanism. The display mechanism directly displays the valve state without the need for data reading and other operations, and reduces the possibility of reading errors caused by pointer offset when using pointer instruments, thereby timely confirming the valve state and improving work efficiency.

[0007] Optionally, the switch assembly includes a first switch and a second switch, the first switch is connected to the box, the second switch is connected to the box, the valve stem is connected to a connecting rod, the outer wall of the connecting rod is connected to an indicator rod, when the indicator rod acts on the first switch, the first switch is electrically connected to the display mechanism and transmits the valve opening signal to the display mechanism, when the indicator rod acts on the second switch, the second switch is electrically connected to the display mechanism and transmits the valve closing signal to the display mechanism.

[0008] By adopting the above technical solution, the first switch and the second switch are set to directly display the open and closed states of the valve, thereby reducing the possibility of the valve being half-opened and half-closed, and improving safety.

[0009] Optionally, the connecting rod includes a sliding portion and a mounting portion, the sliding portion and the mounting portion are connected, the mounting portion is connected to the locking portion, the sliding portion slides with the box body, the mounting portion is in a truncated cone shape, and the piston is stuck in the mounting portion.

[0010] By adopting the above technical solution, a truncated cone-shaped mounting portion is provided, the pneumatic actuator can be sleeved on the mounting portion to fix the piston, the installation is easy, and the structure is simple. When the piston is disassembled, the piston and the connecting rod are completely separated, which is convenient for recycling and reduces resource waste.

[0011] Optionally, the pneumatic actuator includes an actuator housing, a connecting assembly, a top cover and an elastic assembly, the actuator housing is fixed to the valve housing through the connecting assembly, the top cover is fixed to the top of the actuator housing to form a closed cavity, the inner bottom wall of the closed cavity is penetrated by a ventilation groove, the piston is located in the closed cavity, the outer wall of the piston is abutted against the inner wall of the actuator housing, the piston is connected to the valve stem, one side of the piston is connected to the elastic assembly, and the side of the elastic assembly away from the piston is connected to the top cover.

[0012] By adopting the above technical solution, a connecting component is set up, so that the actuator housing is connected to the valve housing through the connecting component, which facilitates the separation of the actuator housing and the valve housing. The gas enters the interior of the closed cavity from the ventilation groove, and under the action of air pressure, the piston is pushed, thereby pushing the valve stem to open or close the valve, thereby improving the smoothness of the piston sliding.

[0013] Optionally, the connecting assembly includes a connecting tube and a connecting piece, a protrusion is provided on the top of the connecting tube, and one end of the connecting tube away from the protrusion is threadedly engaged with the connecting piece, the actuator shell is provided with a connecting groove, the connecting tube is inserted into the connecting groove, the protrusion is abutted against the actuator shell, the connecting piece is slidingly connected to the box body, and when the connecting tube and the connecting piece are threadedly tightened, the connecting piece is abutted against the bottom wall of the actuator shell.

[0014] By adopting the above technical solution, when the pneumatic actuator needs to be installed and connected to the valve housing, the connecting piece is matched with the connecting tube thread, and the connecting piece is screwed so that the connecting piece thread is tightened on the connecting tube and pressed against the pneumatic actuator at the same time, thereby supporting the pneumatic actuator. Furthermore, a protrusion is provided so that the pneumatic actuator is clamped between the protrusion and the connecting piece, thereby reducing the possibility of shaking of the pneumatic actuator and further improving the safety of the device.

[0015] Optionally, a limiting groove is provided on the top of the execution shell, the outer wall of the top cover abuts against the bottom wall of the limiting groove, a positioning groove is provided on the side wall of the limiting groove, a positioning piece is inserted into the positioning groove, and the positioning piece abuts against the top cover.

[0016] By adopting the above technical solution, the top cover is fixed under the action of the groove wall of the limit groove and the positioning piece, reducing the possibility of the top cover shaking due to the connection of the elastic component when the piston slides, improving the stability of the device and reducing safety hazards.

[0017] Optionally, the positioning member is ring-shaped, and a notch is formed through one side of the positioning member.

[0018] By adopting the above technical solution, when installing the positioning piece, it is only necessary to squeeze the positioning piece so that the two ends of the positioning piece move toward the notch, thereby reducing the annular size of the positioning piece, so that the positioning piece can be inserted into the positioning groove. There is no need to use accessories such as threaded parts, the installation operation is simple, and the installation efficiency is improved.

[0019] Optionally, a fixing part is installed in the execution shell, and a fixing nut is provided on one side of the fixing part. The fixing part is fixedly connected to the inner bottom wall of the execution shell through the fixing nut. A fastener is fixed to the bottom wall of the fixing part. A fastening groove is opened on the top wall of the connecting tube. The fastener is inserted into the fastening groove, and the groove wall of the fastening groove abuts against the fastener.

[0020] By adopting the above technical solution, the fastener is inserted into the fastening groove, and the fixing part is installed in a limited position, which reduces the possibility of shaking of the pneumatic actuator and provides a stable sliding basis for the sliding of the valve, thereby improving the sliding smoothness of the valve and reducing safety hazards.

[0021] Optionally, the piston is connected to a mounting seat, a mounting nut is provided on a side of the mounting seat close to the top cover, the mounting seat is fixed to the piston via the mounting nut, and one end of the spring assembly is connected to the mounting seat.

[0022] By adopting the above technical solution, a connection platform is provided for the elastic component, so that the elastic component can be fixed to one side of the piston through installation, thereby reducing the possibility of the elastic component being damaged due to long-term use and causing the piston to be scrapped, reducing the need for piston replacement, and improving the airtightness of the piston in the closed cavity, thereby increasing the service life of the pneumatic actuator.

[0023] Optionally, the top cover is provided with an insertion opening, a locking cylinder is inserted into the insertion opening, the locking cylinder is threadedly connected with a locking nut, the locking nut is abutted against the top cover, a fixing plate is installed inside the top cover, one end of the fixing plate is connected to the elastic component, a side of the fixing plate close to the elastic component is abutted against the locking cylinder, and a side of the fixing plate away from the elastic component is abutted against the top cover.

[0024] By adopting the above technical solution, the fixing plate and the elastic component form a whole, and under the action of the locking cylinder, the fixing plate is stably fixed on the top cover, which facilitates direct replacement of the elastic component.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. The pneumatic actuator drives the valve stem to open or close the valve. The switch assembly monitors the open or closed state of the valve and transmits the open or closed state signal to the display mechanism. The display mechanism directly displays the valve state without the need for data reading and other operations. It also reduces the possibility of reading errors caused by pointer deviation when using pointer instruments, thereby timely confirming the valve state and improving work efficiency. 2. Set the first switch and the second switch to directly display the open and closed states of the valve, reduce the possibility of the valve being half-opened and closed, and improve safety; 3. When the pneumatic actuator needs to be installed and connected to the valve housing, the connecting piece is matched with the connecting tube thread, and the connecting piece is screwed so that the connecting piece thread is tightened on the connecting tube and pressed against the pneumatic actuator at the same time, thereby supporting the pneumatic actuator. Furthermore, a protrusion is provided so that the pneumatic actuator is clamped between the protrusion and the connecting piece, thereby reducing the possibility of shaking of the pneumatic actuator and further improving the safety of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure in the embodiment of the present application.

[0027] Figure 2 It is a schematic diagram of the overall half-section structure in the embodiment of the present application.

[0028] Figure 3 It is a schematic diagram of the internal half-section structure of the pneumatic actuator in the embodiment of the present application.

[0029] Figure 4 It is a schematic diagram of the positioning member structure in an embodiment of the present application.

[0030] Description of reference numerals: 1. Valve housing; 11. Inlet end; 12. Outlet end; 2. Pneumatic actuator; 21. Piston; 211. Mounting seat; 212. Mounting nut; 22. Actuator housing; 221. Ventilation groove; 222. Limiting groove; 223. Positioning groove; 224. Positioning piece; 2241. Through hole; 23. Connecting assembly; 231. Connecting tube; 232. Connecting piece; 233. Fixing piece; 234. Fixing nut; 235. Fastener; 24. Top cover; 25. Inner spring; 26. Outer spring; 3. Display mechanism; 31. On indicator light; 32. Off indicator light; 4. Box body; 41. Sliding groove; 5. Valve stem; 6. Switch assembly; 61. First switch; 62. Second switch; 7. Connecting rod; 71. Indicator rod; 72. Sliding portion; 73. Mounting portion; 74. Locking portion; 741. Locking nut; 8. Insertion port; 81. Locking cylinder; 82. Locking nut; 9. Fixing plate. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-2 This application is described in further detail.

[0032] The embodiment of the present application discloses a switch indicating device for controlling a pneumatic valve.

[0033] Reference Figure 1 and Figure 2A switch indicating device for pneumatic valve control includes a valve housing 1, a pneumatic actuator 2, a display mechanism 3 and a box body 4. The valve housing 1 is provided with an inlet end 11 and an outlet end 12. The inlet end 11 and the outlet end 12 are connected, and a valve is formed at the connection point. The valve housing 1 is slidably connected with a valve stem 5. The pneumatic actuator 2 is connected to the valve housing 1. The pneumatic actuator 2 includes a piston 21. The piston 21 is arranged inside the pneumatic actuator 2. The pneumatic actuator 2 is used to drive the valve stem 5 to move so that the valve is opened or closed. The display mechanism 3 is used to visually and intuitively display the opening or closing of the valve. The bottom wall of the box body 4 is fixedly connected to the top wall of the valve housing 1. The inner wall of the box body 4 is fixedly connected with a switch assembly 6. The switch assembly 6 is electrically connected to the display mechanism 3. The switch assembly 6 is used to monitor the opening or closing state of the valve and transmit the opening or closing signal to the display mechanism 3.

[0034] When the pneumatic valve is used, the pneumatic actuator 2 is started, and the pneumatic actuator 2 drives the valve stem 5 to open or close the valve. The switch component 6 monitors the open or closed state of the valve, and transmits the open or closed state signal to the display mechanism 3. The display mechanism 3 directly displays the valve state without the need for data reading and other operations, and reduces the possibility of reading errors caused by pointer offset when using pointer instruments, thereby timely confirming the valve state and improving work efficiency.

[0035] The display mechanism 3 includes an open indicator light 31 and a closed indicator light 32. To facilitate the distinction between the two, different colors can be set, or text or characters can be used to distinguish them, so as to further confirm the opening and closing status of the valve in a timely manner. Preferably, in this embodiment, the open indicator light 31 is green when it is on, and the closed indicator light 32 is red when it is on.

[0036] The end of the valve stem 5 away from the valve is fixedly connected with a connecting rod 7, and the connecting rod 7 is connected to the piston 21. When the pneumatic actuator 2 is started, the piston 21 slides inside the pneumatic actuator 2, thereby causing the connecting rod 7 to slide. The sliding of the connecting rod 7 drives the valve stem 5 to slide, and the valve stem 5 is inserted into or withdrawn from the connection between the inlet end 11 and the outlet end 12, thereby controlling the opening and closing of the valve.

[0037] The switch assembly 6 includes a first switch 61 and a second switch 62. The first switch 61 is fixedly connected to the inner top wall of the box body 4, and the second switch 62 is fixedly connected to the inner bottom wall of the box body 4. The outer wall of the connecting rod 7 is fixedly connected with an indicator rod 71. The indicator rod 71 is in the shape of a square rod. The box body 4 is provided with a sliding groove 41. The indicator rod 71 is inserted into the sliding groove 41. When the connecting rod 7 slides, the connecting rod 7 drives the indicator rod 71 to slide against the sliding groove 41. The sliding groove 41 limits the sliding direction of the indicator rod 71. The indicator rod 71 acts on the first switch 61. When the indicator rod 71 acts on the second switch 62, the indicator rod 71 separates from the first switch 61, the first switch 61 is turned on, the first switch 61 is electrically connected to the open indicator light 31, and the valve opening signal is transmitted to the open indicator light 31, and the open indicator light 31 lights up green. When the indicator rod 71 acts on the second switch 62, the indicator rod 71 separates from the first switch 61, the second switch 62 is electrically connected to the closed indicator light 32, and the valve closing signal is transmitted to the closed indicator light 32, and the closed indicator light 32 lights up red. In this embodiment, the first switch 61 and the second switch 62 both adopt press-type contact sensors.

[0038] Reference Figure 2 and Figure 3 The connecting rod 7 includes a sliding portion 72, a mounting portion 73 and a locking portion 74. The sliding portion 72 is connected to the mounting portion 73, the mounting portion 73 is connected to the locking portion 74, and the locking portion 74 is connected to the connecting portion, so that the sliding portion 72, the mounting portion 73, the locking portion 74 and the connecting portion are fixedly connected in sequence, and from the sliding portion 72 to the connecting portion, the extended cross-section of the connecting rod 7 is in a successively reduced form, the sliding portion 72 is cylindrical, the sliding portion 72 slides with the box body 4, and the mounting portion 73 is a truncated cone The end of the mounting portion 73 with a larger cross-section is connected to the sliding portion 72. The piston 21 is cylindrical. A notch is provided at the axial center of the piston 21. The mounting portion 73 is inserted into the notch of the piston 21. The outer wall of the mounting portion 73 abuts against the inner wall of the piston 21. The locking portion 74 is threadedly connected with a locking nut 741. The locking nut 741 abuts against the side of the piston 21 away from the sliding portion 72, thereby fixing the position of the piston 21 on the connecting rod 7 and stably mounting the piston 21 on the mounting portion 73.

[0039] The pneumatic actuator 2 also includes an actuator housing 22, a connecting component 23, a top cover 24 and an elastic component. The actuator housing 22 is fixed to the valve housing 1 through the connecting component 23, and the top cover 24 is fixed to the top of the actuator housing 22, so that a closed cavity is formed between the actuator housing 22 and the top cover 24. A ventilation groove 221 is penetrated through the inner bottom wall of the closed cavity, and the compressed air power source is connected to the ventilation groove 221 through a connecting pipe. The piston 21 is located in the closed cavity, and the ventilation groove 221 is located on the side of the piston 21 away from the elastic component. The outer wall of the piston 21 is against the inner wall of the actuator housing 22. The piston 21 is connected to the valve stem 5 through a connecting rod 7. The side of the piston 21 away from the ventilation groove 221 is connected to the elastic component, and the side of the elastic component away from the piston 21 is connected to the top cover 24.

[0040] When the compressed air power source delivers air to the closed cavity through the connecting pipe, the piston 21 slides toward one end of the top cover 24, the elastic component is compressed, the connecting rod 7 drives the valve stem 5 to move toward the end away from the valve, the valve opens, and the open indicator light 31 emits green light. When the compressed air power source draws air into the closed cavity through the connecting pipe, the piston 21 slides toward one end of the box body 4, the elastic component is stretched, the connecting rod 7 drives the valve stem 5 to move toward the end close to the valve, the valve closes, and the closed indicator light 32 emits green light.

[0041] The connecting assembly 23 includes a connecting tube 231 and a connecting member 232. A protrusion is provided on the top of the connecting tube 231, so that the connecting tube 231 is T-shaped. The end of the connecting tube 231 away from the protrusion is threadedly matched with the connecting member 232. The execution shell 22 is provided with a connecting groove matching the protrusion and the connecting tube 231. The connecting groove is T-shaped. The connecting tube 231 is inserted into the connecting groove, and the protrusion is abutted against the groove wall of the connecting groove. The connecting member 232 is slidably connected to the box body 4. When the connecting tube 231 and the connecting member 232 are threadedly tightened, the connecting member 232 is abutted against the bottom wall of the execution shell 22.

[0042] A limiting groove 222 is formed on the top of the execution shell 22 , and the outer wall of the top cover 24 abuts against the bottom wall of the limiting groove 222 . A positioning groove 223 is formed on the side wall of the limiting groove 222 , and a positioning member 224 is inserted into the positioning groove 223 , and the positioning member 224 abuts against the top cover 24 .

[0043] Reference Figure 4The positioning member 224 is annular, and a notch is formed on one side of the positioning member 224. The positioning member 224 is wide in the middle and narrow at both ends, so that the notch of the positioning member 224 is easy to be moved. Both ends of the notch of the positioning member 224 are connected with protrusions, and the protrusions face the center of the ring of the positioning member 224. When the positioning member 224 is inserted into the positioning groove 223, the protrusion is located outside the positioning groove 223, and a through hole 2241 is formed on the side of the protrusion away from the top cover 24, so that the annular size of the positioning member 224 can be further fixed through the through hole 2241. In this example, the positioning member 224 is made of steel.

[0044] Reference Figure 2 and Figure 3 A fixing part 233 is installed in the execution housing 22, and a fixing nut 234 is provided on one side of the fixing part 233. The fixing part 233 is fixedly connected to the inner bottom wall of the execution housing 22 through the fixing nut 234. A fastener 235 is fixed to the bottom wall of the fixing part 233. A fastening groove is opened on the top wall of the connecting tube 231, and the fastener 235 is inserted into the fastening groove, and the groove wall of the fastening groove abuts against the fastener 235.

[0045] The piston 21 is connected to a mounting seat 211. A mounting nut 212 is provided on one side of the mounting seat 211 close to the top cover 24. The mounting nuts 212 are circumferentially distributed at the edge of the mounting seat 211. In this example, four mounting nuts 212 are provided. The mounting seat 211 is fixed to the piston 21 by the mounting nuts 212. One end of the spring assembly unit is connected to the mounting seat 211.

[0046] The top cover 24 is provided with an insertion opening 8, a locking cylinder 81 is inserted into the insertion opening 8, the locking cylinder 81 is threadedly connected with a locking nut 82, the locking nut 82 is against the top cover 24, a fixing plate 9 is installed inside the top cover 24, one end of the fixing plate 9 is connected to the elastic component, the side of the fixing plate 9 close to the elastic component is against the locking cylinder 81, and the side of the fixing plate 9 away from the elastic component is against the top cover 24.

[0047] The fixing plate 9 and the elastic component are formed into a whole, and under the action of the locking cylinder 81, the fixing plate 9 is stably fixed on the top cover 24, so that the elastic component can be directly replaced.

[0048] The elastic component includes an inner spring 25 and an outer spring 26. The inner spring 25 and the outer spring 26 are located on the same axis, and the outer spring 26 is located on the outside of the inner spring 25. One end of the inner spring 25 is fixedly connected to the fixed plate 9, and the end of the inner spring 25 away from the fixed plate 9 is fixedly connected to the mounting seat 211. One end of the outer spring 26 is connected to the fixed plate 9, and the end of the outer spring 26 away from the fixed plate 9 is connected to the mounting seat 211, providing stable elastic support for the piston 21.

[0049] The implementation principle of a switch indicating device for pneumatic valve control in an embodiment of the present application is as follows: when the compressed air power source delivers air to the closed cavity through the connecting pipe, the piston 21 slides toward one end of the top cover 24, the elastic component is compressed, and the connecting rod 7 drives the valve stem 5 to move toward the end away from the valve, the valve opens, and the open indicator light 31 emits green light; when the compressed air power source draws air into the closed cavity through the connecting pipe, the piston 21 slides toward one end of the box body 4, the elastic component is extended, and the connecting rod 7 drives the valve stem 5 to move toward the end close to the valve, the valve closes, and the closed indicator light 32 emits green light, so that the opening and closing of the valve are visually indicated, and there is no need to perform operations such as data reading, and the possibility of reading errors caused by pointer offset when using pointer instruments is reduced, thereby timely confirming the valve status and improving work efficiency.

[0050] The above are all preferred embodiments of the present application. The embodiments are only explanations of the present application and do not limit the protection scope of the present application in turn. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A switch indicating device for pneumatic valve control, characterized in that: include: A valve housing (1), the valve housing (1) being provided with an inlet end (11) and an outlet end (12), the inlet end (11) being connected to the outlet end (12), and a valve being formed at the connection point, and the valve housing (1) being slidably connected to a valve stem (5); A pneumatic actuator (2) is connected to the valve housing (1), and a piston (21) is slidably arranged inside the valve housing. The pneumatic actuator (2) is used to drive the valve stem (5) to move so as to open or close the valve; A display mechanism (3) for visually displaying whether the valve is open or closed; A box body (4) is connected to the valve housing (1); the box body (4) is connected to a switch assembly (6); the switch assembly (6) is electrically connected to the display mechanism (3); the switch assembly (6) is used to monitor the open or closed state of the valve and transmit an open or closed signal to the display mechanism (3).

2. A switch indicating device for pneumatic valve control according to claim 1, characterized in that: The switch assembly (6) comprises a first switch (61) and a second switch (62); the first switch (61) is connected to the housing (4); the second switch (62) is connected to the housing (4); the valve stem (5) is connected to a connecting rod (7); an outer wall of the connecting rod (7) is connected to an indicating rod (71); when the indicating rod (71) acts on the first switch (61), the first switch (61) is electrically connected to the display mechanism (3) and transmits the valve opening signal to the display mechanism (3); when the indicating rod (71) acts on the second switch (62), the second switch (62) is electrically connected to the display mechanism (3) and transmits the valve closing signal to the display mechanism (3).

3. A switch indicating device for pneumatic valve control according to claim 2, characterized in that: The connecting rod (7) comprises a sliding portion (72) and a mounting portion (73); the sliding portion (72) and the mounting portion (73) are connected to each other; the sliding portion (72) slides with the box body (4); the mounting portion (73) is in a truncated cone shape; and the piston (21) is inserted into the mounting portion (73).

4. A switch indicating device for pneumatic valve control according to claim 1, characterized in that: The pneumatic actuator (2) comprises an actuator housing (22), a connecting assembly (23), a top cover (24) and an elastic assembly. The actuator housing (22) is fixed to the valve housing (1) via the connecting assembly (23). The top cover (24) is fixed to the top of the actuator housing (22) to form a closed cavity. The inner bottom wall of the closed cavity is penetrated by a venting groove (221). The piston (21) is located in the closed cavity. The outer wall of the piston (21) abuts against the inner wall of the actuator housing (22). The piston (21) is connected to the valve stem (5). One side of the piston (21) is connected to the elastic assembly. The side of the elastic assembly away from the piston (21) is connected to the top cover (24).

5. A switch indicating device for pneumatic valve control according to claim 4, characterized in that: The connection assembly (23) comprises a connection tube (231) and a connection piece (232); a protrusion is provided on the top of the connection tube (231); an end of the connection tube (231) away from the protrusion is threadedly matched with the connection piece (232); a connection groove is provided on the execution housing (22); the connection tube (231) is inserted into the connection groove; the protrusion abuts against the execution housing (22); the connection piece (232) is slidably connected to the box body (4); when the connection tube (231) and the connection piece (232) are threadedly tightened, the connection piece (232) abuts against the bottom wall of the execution housing (22).

6. A switch indicating device for pneumatic valve control according to claim 4, characterized in that: A limiting groove (222) is provided on the top of the execution shell (22), the outer wall of the top cover (24) abuts against the bottom wall of the limiting groove (222), a positioning groove (223) is provided on the side wall of the limiting groove (222), a positioning member (224) is inserted into the positioning groove (223), and the positioning member (224) abuts against the top cover (24).

7. A switch indicating device for pneumatic valve control according to claim 6, characterized in that: The positioning piece (224) is ring-shaped, and a notch is formed through one side of the positioning piece (224).

8. A switch indicating device for pneumatic valve control according to claim 5, characterized in that: A fixing member (233) is installed in the actuator housing (22), a fixing nut (234) is provided on one side of the fixing member (233), the fixing member (233) is fixedly connected to the inner bottom wall of the actuator housing (22) via the fixing nut (234), a fastener (235) is fixed to the bottom wall of the fixing member (233), a fastening groove is provided on the top wall of the connecting tube (231), the fastening member (235) is inserted into the fastening groove, and the groove wall of the fastening groove abuts against the fastener (235).

9. A switch indicating device for pneumatic valve control according to claim 4, characterized in that: The piston (21) is connected to a mounting seat (211), a mounting nut (212) is provided on a side of the mounting seat (211) close to the top cover (24), the mounting seat (211) is fixed to the piston (21) via the mounting nut (212), and one end of the spring assembly is connected to the mounting seat (211).

10. A switch indicating device for pneumatic valve control according to claim 4, characterized in that: The top cover (24) is provided with an insertion opening (8), a locking cylinder (81) is inserted into the insertion opening (8), a locking nut (82) is threadedly connected to the locking cylinder (81), and the locking nut (82) abuts against the top cover (24). A fixing plate (9) is installed inside the top cover (24), one end of the fixing plate (9) is connected to the elastic component, a side of the fixing plate (9) close to the elastic component abuts against the locking cylinder (81), and a side of the fixing plate (9) away from the elastic component abuts against the top cover (24).

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