High-precision flow control method and device for proportional valve

Abstract

The invention discloses a high-precision flow control method and device for a proportional valve, and relates to the technical field of valves. The high-precision flow control method of the proportional valve comprises the following steps that firstly, according to the flow and pressure requirements of a system, the appropriate model and specification of the proportional valve are selected; a device used in the high-precision flow control method of the proportional valve comprises a valve body shell, a liquid passing hole is formed in the position, close to the center of one side, of the interior of the valve body shell, a liquid inlet pipe is fixedly connected to the position, located at the liquid passing hole, of the top end of the valve body shell, and a first liquid outlet pipe is fixedly connected to the position, located at the liquid passing hole, of the bottom end of the valve body shell; according to the device, the effect of adjusting the fluid flow is achieved by rotating a second rotating handle and a third rotating handle under the mutual cooperation of a flow control mechanism, a threaded sleeve and a flow control block, and then the problems that different use requirements cannot be met and waste is caused due to the fact that the flow cannot be adjusted are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and specifically to a high-precision flow control method and device for a proportional valve. Background Art

[0002] In a hydraulic transmission system, as a core component for realizing flow, pressure, and direction control, the proportional valve is widely used in fields such as construction machinery, metallurgical equipment, aerospace, etc. As the working medium of the proportional valve, the flow control accuracy of hydraulic oil directly affects the stability, response speed, and working efficiency of the system. With the continuous improvement of industrial automation level, higher requirements are put forward for the flow control accuracy and adaptability of the proportional valve; Currently, some proportional valves on the market still adopt a fixed flow-through design, and the internal flow channel size and spool structure are fixed during the manufacturing stage, making it difficult to flexibly adjust according to the actual working conditions. For example, when an excavator is performing excavation operations, it requires a large flow rate to drive the boom and arm to move quickly to improve the operation efficiency. However, during fine breaker operations or micro-operation stages, a small flow rate is required to ensure the movement smoothness and control accuracy. Proportional valves with fixed flow rates are not convenient for meeting diverse usage requirements. In addition, most proportional valves only play the role of controlling the flow rate and cannot filter the flow body mixed with impurities, resulting in the need for additional filtration processes when working in an environment with a slightly contaminated flow body, wasting manpower and material resources and reducing work efficiency. To solve the above problems, the inventor proposes a high-precision flow control method and device for a proportional valve to solve the above problems. Summary of the Invention

[0003] To solve the problems that it is not convenient to adjust the flow rate, making it difficult to meet different usage requirements and causing waste, and that it is impossible to filter the flow body mixed with impurities, resulting in the need for additional filtration processes when working in an environment with a slightly contaminated flow body; the purpose of the present invention is to provide a high-precision flow control method and device for a proportional valve.

[0004] To solve the above technical problems, the present invention adopts the following technical solution: A high-precision flow control method for a proportional valve, comprising the following steps: S1: First, according to the flow rate and pressure requirements of the system, select a suitable proportional valve model and specification. The proportional valve should have the characteristics of high precision and high response speed to meet the control requirements to be achieved; S2: Adjust the proportional valve to the initial state, usually by rotating the valve stem to the fully closed position to ensure that the valve port is completely closed and confirm that no flow passes through the proportional valve in the initial state; S3: Slowly rotate the valve stem to gradually open the valve port. During the rotation process, pay attention to observing the reading of the flow meter to ensure that the increase in flow rate is slow and uniform; S4: When the flow rate is close to the target value, reduce the amplitude of the rotating valve stem for finer adjustment. It is possible to gradually adjust the flow rate to the target value by making multiple small rotations and observing the change in the flow rate. Once the flow rate reaches the target value, a locking structure (such as a locking nut) is required to lock the valve stem in the current position to prevent the valve stem position from changing due to vibration or other factors.

[0005] A device used in a high-precision flow control method for a proportional valve, including a valve body housing. An overflow hole is provided inside the valve body housing near the center of one side. A liquid inlet pipe is fixedly connected to the top of the valve body housing at the overflow hole. A first liquid outlet pipe is fixedly connected to the bottom of the valve body housing at the overflow hole. A filtering mechanism is fixedly connected to the bottom of the first liquid outlet pipe. A second liquid outlet pipe is fixedly connected to the center of the bottom of the filtering mechanism. A threaded sleeve is slidably inserted inside the valve body housing near the overflow hole. A flow control block is fixedly connected to the side of the threaded sleeve inside the overflow hole. An inner cavity is provided inside the valve body housing near the center of the other side. A flow control mechanism is rotatably connected to the center of the side of the inner cavity away from the overflow hole.

[0006] Preferably, the filtering mechanism includes a filtering box, and the top of the filtering box is fixedly connected to the first liquid outlet pipe. A filter plate is slidably inserted into the center of the filtering box. A U-shaped box is fixedly connected to the side of the filtering box. A square plate is fixedly connected to the center of the side of the filter plate close to the U-shaped box.

[0007] Preferably, a pulling block is fixedly connected to the center of the side of the filter plate away from the U-shaped box. L-shaped plates are symmetrically and fixedly connected to the center of the side of the square plate away from the pulling block and close to the center. A mounting plate is fixedly connected to the center between the side walls of the U-shaped box.

[0008] Preferably, a first rotating handle is rotatably connected to the center of the side of the U-shaped box away from the pulling block. A first connecting shaft is rotatably connected to the center of the side of the mounting plate, and one end of the first connecting shaft penetrates through the U-shaped box and is fixedly connected to the first rotating handle. A square block is rotatably connected to the center of the other side of the mounting plate, and the other end of the first connecting shaft penetrates through the mounting plate and is fixedly connected to the square block.

[0009] Preferably, slide rails are symmetrically and fixedly connected to the side of the mounting plate close to the square block. A sliding plate is slidably connected to the side of the slide rail. Bent rods are symmetrically and rotatably connected to the center between the two sliding plates and the square block, and the two bent rods are arranged in a staggered manner. A limiting plate is fixedly connected to the center of the side of the sliding plate away from the square block, and the two limiting plates are symmetrically distributed.

[0010] Preferably, the flow control mechanism includes a circular box. A first lead screw is fixedly connected to the center of the side of the circular box, and the first lead screw is in threaded rotation connection with the threaded sleeve. A square box is fixedly connected to the center of the side wall of the circular box.

[0011] Preferably, a circular ring plate is fixedly connected between the inner walls of the inner cavity and near one side of the circular box. A plurality of jacks are provided at the center of the inner wall of the circular ring plate. A plug shaft is slidably inserted in the outer ring of the circular box and at the same horizontal level as the jacks. The center of the side wall of the square box is slidably connected with a lifting plate, and the bottom end of the plug shaft penetrates through the square box and is fixedly connected with the lifting plate.

[0012] Preferably, a short shaft is rotatably connected to the bottom end near the center of the interior of the square box. A second lead screw is fixedly connected to the top end of the short shaft, and the lifting plate is in threaded rotational connection with the second lead screw.

[0013] Preferably, a first bevel gear is fixedly connected to the outer ring of the short shaft and near the bottom. A second connecting shaft is rotatably connected to the center of the side wall of the square box near the bottom. A second bevel gear is fixedly connected to one side end of the second connecting shaft near the second lead screw, and the second bevel gear meshes with the first bevel gear. A second rotating handle is rotatably connected to the side end of the circular box near the center, and the other side end of the second connecting shaft penetrates through the circular box and is fixedly connected with the second rotating handle. A third rotating handle is fixedly connected to the side end of the circular box and near the outer ring.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the present invention, by rotating the second rotating handle and the third rotating handle, and with the mutual cooperation between the flow control mechanism, the threaded sleeve and the flow control block, the effect of adjusting the fluid flow rate is achieved, thereby solving the problem that the flow rate cannot be adjusted, resulting in the inability to meet different usage requirements and causing waste. 2. In the present invention, by rotating the first rotating handle, and with the mutual cooperation between the filtering mechanism, the square block, the bent rod, the limiting plate, the L-shaped plate and the pulling block, not only the filtering work of impurities is completed, but also the effect of conveniently cleaning the filtering structure is achieved, thereby solving the problem that the flow body mixed with impurities cannot be filtered, and additional filtering processes are required when working in an environment with a slightly impure flow body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a schematic cross-sectional view of the valve body housing of the present invention.

[0018] Figure 3 This is a schematic cross-sectional view of the filter box of the present invention.

[0019] Figure 4 This is a schematic cross-sectional view of the U-shaped box of the present invention.

[0020] Figure 5 For the present invention Figure 2 Schematic enlarged view of part A in

[0021] Figure 6 For the present invention Figure 5 Schematic enlarged view of part B in

[0022] Figure 7 For the present invention Figure 3 Schematic enlarged view of part C in

[0023] Figure 8 For the present invention Figure 4 Schematic enlarged view of part D in

[0024] In the figure: 1. Valve body housing; 101. Liquid inlet pipe; 102. First liquid outlet pipe; 103. Liquid passing hole; 104. Threaded sleeve; 105. Flow control block; 106. Inner cavity; 107. Second liquid outlet pipe; 2. Filter mechanism; 201. Filter box; 202. Filter plate; 203. Square plate; 204. Pulling block; 205. L-shaped plate; 206. U-shaped box; 207. Mounting plate; 208. First turning handle; 209. First connecting shaft; 210. Square block; 211. Slide rail; 212. Slide plate; 213. Bent rod; 214. Limiting plate; 3. Flow control mechanism; 301. Circular box; 302. First lead screw; 303. Square box; 304. Ring plate; 305. Insertion hole; 306. Insertion shaft; 307. Lifting plate; 308. Short shaft; 309. Second lead screw; 310. First bevel gear; 311. Second connecting shaft; 312. Second bevel gear; 313. Second turning handle; 314. Third turning handle. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Embodiment: As Figures 1-8 shown, the present invention provides a technical solution: a high-precision flow control method for a proportional valve, including the following steps: S1: First, select a suitable proportional valve model and specification according to the flow rate and pressure requirements of the system. The proportional valve should have the characteristics of high precision and high response speed to meet the control requirements to be achieved. S2: Adjust the proportional valve to its initial state. Usually, rotate the valve stem to the fully closed position to ensure that the valve port is completely closed, and confirm that there is no flow passing through the proportional valve in the initial state. S3: Slowly rotate the valve stem to gradually open the valve port. During the rotation process, pay attention to observing the reading of the flow meter to ensure that the increase in flow rate is slow and uniform. S4: When the flow rate approaches the target value, reduce the amplitude of rotating the valve stem for finer adjustment. By making multiple small rotations and observing the change in flow rate, gradually adjust the flow rate to the target value. Once the flow rate reaches the target value, use a locking structure (such as a locking nut) to lock the valve stem in the current position to prevent the valve stem position from changing due to vibration or other factors.

[0027] A device used in a high-precision flow control method for a proportional valve, including a valve body housing 1. An overflow hole 103 is provided inside the valve body housing 1 near the center of one side. A liquid inlet pipe 101 is fixedly connected to the top of the valve body housing 1 at the position of the overflow hole 103. Flange plates are provided at the ends of the liquid inlet pipe 101 and the second liquid outlet pipe 107 away from the valve body housing 1. A first liquid outlet pipe 102 is fixedly connected to the bottom of the valve body housing 1 at the position of the overflow hole 103. A filtering mechanism 2 is fixedly connected to the bottom of the first liquid outlet pipe 102. A second liquid outlet pipe 107 is fixedly connected to the center of the bottom of the filtering mechanism 2. A threaded sleeve 104 is slidably inserted inside the valve body housing 1 near the overflow hole 103. A guiding block is provided on the outer ring of the threaded sleeve 104, and the guiding block is slidably connected to the inside of the valve body housing 1. A flow control block 105 is fixedly connected to the side end of the threaded sleeve 104 inside the overflow hole 103. An inner cavity 106 is provided inside the valve body housing 1 near the center of the other side. A flow control mechanism 3 is rotatably connected to the center of the side end of the inner cavity 106 away from the overflow hole 103. The flow control mechanism 3 is rotatably inserted into the center of the side end of the valve body housing 1 to facilitate the rotation of the flow control mechanism 3 for operation.

[0028] The filtering mechanism 2 includes a filtering box 201, and the top of the filtering box 201 is fixedly connected to the first liquid outlet pipe 102. A filter plate 202 is slidably inserted into the center of the filtering box 201. A U-shaped box 206 is fixedly connected to the side end of the filtering box 201. A square plate 203 is fixedly connected to the center of the side end of the filter plate 202 close to the U-shaped box 206.

[0029] By adopting the above technical solution, a filter plate 202 is provided inside the filtering box 201 to filter impurities doped in the fluid. A square plate 203 is provided at the side end of the filter plate 202 to limit the filter plate 202. The square plate 203 is slidably inserted into the inside of the side end of the filtering box 201.

[0030] A pull block 204 is fixedly connected to the center of one side end of the filter plate 202 away from the U-shaped box 206. Symmetrically fixed to the side end of the square plate 203 away from the pull block 204 and near the center are L-shaped plates 205. A mounting plate 207 is fixedly connected between the side walls of the U-shaped box 206 and at the center thereof.

[0031] By adopting the above technical solution, a pull block 204 is provided at the center of the other side end of the filter plate 202 to facilitate the taking of the filter plate 202 inside the filter box 201. Two L-shaped plates 205 are provided at the side end of the square plate 203 to limit the filter plate 202.

[0032] A rotating handle one 208 is rotatably connected to the center of the side end of the U-shaped box 206 away from the pull block 204. A connecting shaft one 209 is rotatably connected to the center of the side end of the mounting plate 207, and the side end of the connecting shaft one 209 penetrates through the U-shaped box 206 and is fixedly connected to the rotating handle one 208. A square block 210 is rotatably connected to the center of the other side end of the mounting plate 207, and the other end of the connecting shaft one 209 penetrates through the mounting plate 207 and is fixedly connected to the square block 210.

[0033] By adopting the above technical solution, a rotating handle one 208 is rotatably connected to the center of the side end of the U-shaped box 206 to drive the square block 210 at the side end of the mounting plate 207, thereby achieving the effect of moving the sliding plates 212 towards each other.

[0034] Symmetrically fixed to the side end of the mounting plate 207 away from the rotating handle one 208 and near the square block 210 are slide rails 211. Slide plates 212 are slidably connected to the side ends of the slide rails 211. Bent rods 213 are symmetrically rotatably connected between the two slide plates 212 and the square block 210 and near the center, and the two bent rods 213 are staggeredly distributed. A limiting plate 214 is fixedly connected to the center of the side end of the slide plate 212 away from the square block 210, and the two limiting plates 214 are symmetrically distributed.

[0035] By adopting the above technical solution, slide rails 211 are symmetrically provided at the side end of the mounting plate 207 near the square block 210 to slidably arrange two slide plates 212, thereby driving the two limiting plates 214 to move towards each other.

[0036] The flow control mechanism 3 includes a circular box 301. A lead screw one 302 is fixedly connected to the center of the side end of the circular box 301, and the lead screw one 302 is in threaded rotation connection with the threaded sleeve 104. A square box 303 is fixedly connected to the center of the side wall of the circular box 301.

[0037] By adopting the above technical solution, after the lead screw one 302 rotates, the threaded sleeve 104 in threaded rotation connection can drive the flow control block 105 to move horizontally under the action of the guide block, thereby achieving the effect of adjusting the fluid flow rate.

[0038] A circular ring plate 304 is fixedly connected between the inner walls of the inner cavity 106 and near one side of the circular box 301. A plurality of jacks 305 are opened at the center of the inner wall of the circular ring plate 304. A plug shaft 306 is slidably inserted on the outer circle of the circular box 301 and at the same horizontal level as the jacks 305. A lifting plate 307 is slidably connected to the center of the side wall of the square box 303, and the bottom end of the plug shaft 306 penetrates through the square box 303 and is fixedly connected to the lifting plate 307.

[0039] By adopting the above technical solution, the circular ring plate 304 is arranged at the inner cavity 106 and a plurality of jacks 305 are opened on its inner wall to cooperate with the plug shaft 306 to complete the function of limiting the circular box 301.

[0040] A short shaft 308 is rotatably connected to the bottom end near the center inside the square box 303. A second lead screw 309 is fixedly connected to the top end of the short shaft 308, and the lifting plate 307 is in threaded rotational connection with the second lead screw 309.

[0041] By adopting the above technical solution, the second lead screw 309 is arranged at the top end of the short shaft 308 to drive the plug shaft 306 to lift through the lifting plate 307 in threaded rotational connection and cooperate with the jacks 305 to complete the effect of limiting the circular box 301.

[0042] A first bevel gear 310 is fixedly connected to the outer circle of the short shaft 308 and near the bottom. A second connecting shaft 311 is rotatably connected to the center of the side wall of the square box 303 and near the bottom. A second bevel gear 312 is fixedly connected to one side end of the second connecting shaft 311 near the second lead screw 309, and the second bevel gear 312 is meshed with the first bevel gear 310. A second rotating handle 313 is rotatably connected to the side end of the circular box 301 near the center, and the other side end of the second connecting shaft 311 penetrates through the circular box 301 and is fixedly connected to the second rotating handle 313. A third rotating handle 314 is fixedly connected to the side end of the circular box 301 and near the outer circle.

[0043] By adopting the above technical solution, rotating the third rotating handle 314 can make the fixedly connected second connecting shaft 311 drive the second bevel gear 312 to rotate, and then the engaged first bevel gear 310 will drive the short shaft 308 and the second lead screw 309 to rotate.

[0044] Working principle: When this device is in use, fluid is input through the liquid inlet pipe 101 and reaches the inside of the filtration box 201 through the first liquid outlet pipe 102. Subsequently, the filtration of the fluid is completed under the action of the filter plate 202, and finally it is transported out through the second liquid outlet pipe 107. When it is necessary to adjust the fluid flow rate, first rotate the second rotating handle 313, so that the fixedly connected second connecting shaft 311 drives the second bevel gear 312 to rotate. Under the cooperative action of the meshing first bevel gear 310, the first bevel gear 310 drives the short shaft 308 and the second lead screw 309 to rotate. At this time, the lifting plate 307 connected by screw rotation will drive the insertion shaft 306 to descend, so that the insertion shaft 306 moves out of the insertion hole 305, achieving the effect of releasing the circular box 301. After the release is completed, relying on the third rotating handle 314, the circular box 301 can be driven to rotate, so that the fixedly connected first lead screw 302 rotates. Immediately afterwards, the threaded sleeve 104 connected by screw rotation will drive the flow control block 105 to move horizontally, thus achieving the effect of adjusting the fluid flow rate. After the adjustment is completed, the second rotating handle 313 needs to be rotated forward and backward. Wait until the insertion shaft 306 is inserted into another insertion hole 305. At this time, the circular box 301 will be re-limited to prevent the position of the flow control block 105 from changing due to vibration or other factors; After the filter plate 202 has been working for a long time, it needs to be taken out and cleaned. When taking it out, rotate the first rotating handle 208, so that the fixedly connected first connecting shaft 209 drives the square block 210 to rotate. Subsequently, under the cooperation of the two rotatably connected bent rods 213, the two sliding plates 212 move towards each other under the action of the slide rails 211, and then drive the two fixedly connected limiting plates 214 to move towards each other. Thus, the limiting effect on the two L-shaped plates 205 will be released. After the limiting work on the L-shaped plates 205 and the square plate 203 is released, the staff can take out the filter plate 202 from the filtration box 201 through the pulling block 204. After the cleaning is completed, rotate the first rotating handle 208 in the reverse direction. Wait until the two limiting plates 214 complete the limiting work on the two L-shaped plates 205. In this way, not only the filtration of impurities is completed, but also the effect of conveniently cleaning the filtration structure can be achieved.

[0045] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these changes and modifications.

Claims

1. A high-precision flow control method for a proportional valve, characterized in that, It includes the following steps: S1: First, select a suitable proportional valve model and specification according to the flow rate and pressure requirements of the system. The proportional valve should have the characteristics of high precision and high response speed to meet the control requirements to be achieved; S2: Adjust the proportional valve to the initial state. Usually, rotate the valve stem to the fully closed position to ensure that the valve port is completely closed and confirm that there is no flow passing through the proportional valve in the initial state; S3: Slowly rotate the valve stem to gradually open the valve port. During the rotation process, pay attention to observing the reading of the flow meter to ensure that the increase in flow rate is slow and uniform; S4: When the flow rate is close to the target value, reduce the amplitude of rotating the valve stem for finer adjustment. It is possible to gradually adjust the flow rate to the target value by making multiple small rotations and observing the change in flow rate. Once the flow rate reaches the target value, a locking structure (such as a locking nut) needs to be used to lock the valve stem in the current position to prevent the valve stem position from changing due to vibration or other factors.

2. An apparatus used in a high-precision flow control method for a proportional valve as described in claim 1, comprising a valve body housing (1), characterized in that, An overflow hole (103) is opened inside the valve body housing (1) and near the center of one side. A liquid inlet pipe (101) is fixedly connected to the top end of the valve body housing (1) and at the position of the overflow hole (103). A first liquid outlet pipe (102) is fixedly connected to the bottom end of the valve body housing (1) and at the position of the overflow hole (103). A filtering mechanism (2) is fixedly connected to the bottom end of the first liquid outlet pipe (102). A second liquid outlet pipe (107) is fixedly connected to the center of the bottom end of the filtering mechanism (2). A threaded sleeve (104) is slidably inserted inside the valve body housing (1) near the overflow hole (103). A flow control block (105) is fixedly connected to the side end of the threaded sleeve (104) and inside the overflow hole (103). An inner cavity (106) is opened inside the valve body housing (1) and near the center of the other side. A flow control mechanism (3) is rotatably connected to the center of the side end of the inner cavity (106) away from the overflow hole (103).

3. The device used in the high-precision flow control method of a proportional valve according to claim 2, characterized in that, The filtering mechanism (2) includes a filtering box (201), and the top end of the filtering box (201) is fixedly connected to the first liquid outlet pipe (102). A filter plate (202) is slidably inserted into the center of the filtering box (201). A U-shaped box (206) is fixedly connected to the side end of the filtering box (201). A square plate (203) is fixedly connected to the center of the side end of the filter plate (202) close to the U-shaped box (206).

4. The device used in the high-precision flow control method of a proportional valve according to claim 3, characterized in that, A pulling block (204) is fixedly connected to the center of the side end of the filter plate (202) away from the U-shaped box (206). L-shaped plates (205) are symmetrically and fixedly connected to the center of the side end of the square plate (203) away from the pulling block (204). A mounting plate (207) is fixedly connected to the center between the side walls of the U-shaped box (206).

5. The device used in the high-precision flow control method of a proportional valve according to claim 4, characterized in that, A rotating handle one (208) is rotatably connected to the center of one side end of the U-shaped box (206) away from the pulling block (204). A connecting shaft one (209) is rotatably connected to the center of the side end of the mounting plate (207). The side end of the connecting shaft one (209) penetrates through the U-shaped box (206) and is fixedly connected to the rotating handle one (208). A square block (210) is rotatably connected to the center of the other side end of the mounting plate (207). The other end of the connecting shaft one (209) penetrates through the mounting plate (207) and is fixedly connected to the square block (210).

6. The device used in the high-precision flow control method of a proportional valve according to claim 5, characterized in that, On the side end of the mounting plate (207) away from the rotating handle one (208) and near the square block (210), slide rails (211) are symmetrically and fixedly connected. A sliding plate (212) is slidably connected to the side end of the slide rail (211). Bent rods (213) are symmetrically and rotatably connected between the two sliding plates (212) and the square block (210) near the center, and the two bent rods (213) are staggeredly distributed. A limiting plate (214) is fixedly connected to the center of the side end of the sliding plate (212) away from the square block (210), and the two limiting plates (214) are symmetrically distributed.

7. The device used in the high-precision flow control method of a proportional valve according to claim 2, characterized in that, The flow control mechanism (3) includes a circular box (301). A lead screw one (302) is fixedly connected to the center of the side end of the circular box (301), and the lead screw one (302) is in threaded rotation connection with the threaded sleeve (104). A square box (303) is fixedly connected to the center of the side wall of the circular box (301).

8. The device used in the high-precision flow control method of a proportional valve according to claim 7, characterized in that, A circular ring plate (304) is fixedly connected between the inner walls of the inner cavity (106) near one side of the circular box (301). A plurality of jacks (305) are opened at the center of the inner wall of the circular ring plate (304). A plug shaft (306) is slidably inserted in the outer circle of the circular box (301) at the same horizontal level as the jacks (305). A lifting plate (307) is slidably connected to the center of the side wall of the square box (303), and the bottom end of the plug shaft (306) penetrates through the square box (303) and is fixedly connected to the lifting plate (307).

9. The device used in the high-precision flow control method of a proportional valve according to claim 8, characterized in that, A short shaft (308) is rotatably connected to the center of the inner bottom end of the square box (303). A lead screw two (309) is fixedly connected to the top end of the short shaft (308), and the lifting plate (307) is in threaded rotation connection with the lead screw two (309).

10. The device used in the high-precision flow control method of a proportional valve according to claim 9, characterized in that, A bevel gear one (310) is fixedly connected to the outer circle of the short shaft (308) near the bottom. A connecting shaft two (311) is rotatably connected to the center of the side wall of the square box (303) near the bottom. A bevel gear two (312) is fixedly connected to the side end of the connecting shaft two (311) near the lead screw two (309), and the bevel gear two (312) meshes with the bevel gear one (310). A rotating handle two (313) is rotatably connected to the center of the side end of the circular box (301), and the other side end of the connecting shaft two (311) penetrates through the circular box (301) and is fixedly connected to the rotating handle two (313). A rotating handle three (314) is fixedly connected to the side end of the circular box (301) near the outer circle.

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