Closed-loop flow control system

Abstract

The utility model discloses a closed-loop flow control system, which belongs to the field of control systems, and comprises a tank body and an arranged closed-loop flow control mechanism, and an electric proportional valve automatically reduces the pressure of a high-pressure gas source conveyed by a high-pressure gas conveying pipe through a pressure reducing valve and quickly and constantly controls the pressure to a pressure set value. The pressure loaded in the tank body can be controlled so that the output flow of materials in the tank body can be rapidly adjusted and controlled, a pressure control loop structure can be formed, after the interior of the tank body is pressurized, the materials in the tank body are discharged into the material conveying pipe through the discharging port under the pressure effect, the second control valve is opened so that the materials in the material conveying pipe can be discharged for use, and in the process, the materials in the tank body can be discharged through the discharging port. The flow meter detects the flow of materials discharged from the tank body, meanwhile, the controller detects an output signal of the flow meter and compares the output signal with a set value, then the pressure control loop is driven to enable the output flow of the materials in the tank body to be stabilized at the set flow value, and therefore high-precision material flow control over spraying equipment can be achieved.

Description

Technical Field

[0001] The utility model relates to the field of control systems, in particular to a closed-loop flow control system. Background Art

[0002] A closed-loop control system is a type of control system. Specifically, it involves feeding part or all of the control system's output back to the system's input through certain methods and devices. The feedback information is then compared with the original input, and the comparison result is applied to the system to control it and prevent it from deviating from its intended target. Closed-loop control systems utilize negative feedback. These are automatic control systems whose closed loop consists of a positive signal path and a feedback path. They are also called feedback control systems.

[0003] In the prior art, spraying equipment is often required in the process of spraying processing. During the use of the spraying equipment, a closed-loop flow control system is used to control the flow of the sprayed paint. The closed-loop flow control system controls the paint spraying flow of the spraying equipment. However, the structure of the closed-loop flow control system used by the current spraying equipment is relatively complex, resulting in a high cost for controlling the paint flow of the spraying equipment. At the same time, after the spraying equipment has been used for a long time, material residue will adhere to the inside of its tank, which will further affect the pressure transmission and flow control. Utility Model Content

[0004] The main purpose of the present invention is to provide a closed-loop flow control system that can effectively solve the problems in the background technology.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A closed-loop flow control system comprises a tank body, wherein the tank body is provided with a closed-loop flow control mechanism, and the closed-loop flow control mechanism comprises a controller, an electric proportional valve, a pressure reducing valve, a flow meter and a second control valve, the controller is fixedly connected to the top surface of the support plate on the right side of the tank body, and the electric proportional valve and the pressure reducing valve are both fixedly connected to the top surface of the tank body, a first connecting pipe is also connected between the electric proportional valve and the pressure reducing valve, and a second connecting pipe is connected between the electric proportional valve and the tank body, the flow meter is connected to the discharge port on the left side of the tank body, and a feed pipe is connected between the flow meter and the second control valve, a scraper mechanism is also provided inside the tank body, and the scraper mechanism comprises a drive motor, a rotating plate and a scraper plate, the drive motor is fixedly connected to the bottom surface of the tank body, and the rotating plate is fixedly connected to the output end of the drive motor, and the scraper plate is fixedly connected on both sides of the rotating plate.

[0007] Preferably, a support plate is fixedly mounted on the bottom end of the right side wall of the tank body, and a controller is fixedly mounted on the top surface of the support plate.

[0008] Preferably, a feed port is fixedly installed on the front end of the top surface of the tank body, and the feed port is fixedly installed on the input end of the first control valve. A feeding pipe is also fixedly installed on the output end of the first control valve, and a liquid level meter is fixedly installed at the rear of the top surface of the tank body.

[0009] Preferably, an air inlet is fixedly installed on the top of the left side wall of the tank body, and an electric proportional valve and a pressure reducing valve are fixedly installed on the top surface of the tank body respectively, a second connecting pipe is fixedly installed between the output end of the electric proportional valve and the air inlet, and a first connecting pipe is fixedly installed between the input end of the electric proportional valve and the output end of the pressure reducing valve, and a high-pressure gas delivery pipe is also fixedly installed on the input end of the pressure reducing valve.

[0010] Preferably, a discharge port is fixedly installed at the bottom of the left side wall of the tank body, and the discharge port is fixedly installed together with the input end of the flow meter, and a feed pipe is also fixedly installed between the output end of the flow meter and the input end of the second control valve.

[0011] Preferably, the driving motor is fixedly mounted on the bottom surface of the tank body, and a rotating plate is fixedly mounted on the top surface of the output end of the driving motor, and scraping plates tightly attached to the inner wall of the tank body are fixedly mounted on both side walls of the rotating plate.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] In the utility model, a closed-loop flow control mechanism is set up, and the electric proportional valve automatically reduces the pressure of the high-pressure gas source delivered by the high-pressure gas delivery pipe through the pressure reducing valve, and quickly and constantly controls the pressure setting value, which can control the pressure loaded in the tank body, so as to quickly adjust and control the output flow rate of the material in the tank body, and can form a pressure control loop structure. After the internal of the tank body is pressurized, the internal material is discharged into the delivery pipe through the discharge port under the action of pressure, and the second control valve is opened to discharge the material in the delivery pipe for use. In this process, the flow meter will detect the flow rate of the material discharged from the tank body. At the same time, the controller detects the output signal of the flow meter and compares it with the set value, and then drives the pressure control loop to stabilize the output flow rate of the material in the tank body at the set flow value. In this way, it can be used as a flow control loop. The circuit structure detects the output flow of the material in the tank and outputs a control set value to the pressure control circuit, so that the output of the flow control circuit is used as the input of the pressure control circuit. The pressure control circuit is executed as the final flow control circuit, which can achieve high-precision material flow control for the spraying equipment. The overall device structure is simple, and the cost of controlling the paint flow of the spraying equipment is reduced. It is further combined with the use of the scraper mechanism. By turning on the drive motor to drive the output end to rotate the rotating plate, the rotating plate drives the scraper plate to rotate close to the inner wall of the tank. During the process, the material residue attached to the inner wall of the tank can be scraped off and dropped into the tank body, which not only avoids material waste, but also prevents the material residue from affecting the pressure transmission of the closed-loop flow control mechanism and the control of the flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the overall structure of the tank body of the present utility model;

[0016] Figure 3 This is a schematic diagram of the overall structure of the closed-loop flow control mechanism of the present utility model;

[0017] Figure 4 It is a schematic diagram of the overall structure of the scraping mechanism of the present utility model.

[0018] In the figure: 1. Tank body; 2. Closed-loop flow control mechanism; 3. Scraper mechanism; 4. Feed port; 5. Discharge port; 6. Air inlet; 7. Support plate; 8. Controller; 9. First control valve; 10. Feeding pipe; 11. Liquid level gauge; 12. Electric proportional valve; 13. Pressure reducing valve; 14. High-pressure gas delivery pipe; 15. First connecting pipe; 16. Second connecting pipe; 17. Flow meter; 18. Delivery pipe; 19. Second control valve; 20. Drive motor; 21. Rotating plate; 22. Scraper plate. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0020] like Figure 1 - Figure 4 As shown, a closed-loop flow control system includes a tank body 1, a closed-loop flow control mechanism 2 is provided on the tank body 1, and the closed-loop flow control mechanism 2 includes a controller 8, an electric proportional valve 12, a pressure reducing valve 13, a flow meter 17 and a second control valve 19, the controller 8 is fixedly connected to the top surface of the support plate 7 on the right side of the tank body 1, and the electric proportional valve 12 and the pressure reducing valve 13 are both fixedly connected to the top surface of the tank body 1, a first connecting pipe 15 is further connected between the electric proportional valve 12 and the pressure reducing valve 13, and the electric proportional valve A second connecting pipe 16 is connected between 12 and the tank body 1, the flow meter 17 is connected to the discharge port 5 on the left side of the tank body 1, and a feed pipe 18 is connected between the flow meter 17 and the second control valve 19. A scraper mechanism 3 is also provided inside the tank body 1, and the scraper mechanism 3 includes a drive motor 20, a rotating plate 21 and a scraper plate 22. The drive motor 20 is fixedly connected to the bottom surface of the tank body 1, and the rotating plate 21 is fixedly connected to the output end of the drive motor 20, and the scraper plate 22 is fixedly connected to both sides of the rotating plate 21.

[0021] like Figure 2 - Figure 3 As shown, a support plate 7 is fixedly mounted on the bottom end of the right side wall of the tank body 1, and a controller 8 is fixedly mounted on the top surface of the support plate 7. The controller 8 mounted on the top surface of the support plate 7 is used to control the closed-loop flow control mechanism 2 and the scraping mechanism 3;

[0022] like Figure 2 - Figure 3 As shown, a feed port 4 is fixedly mounted on the front end of the top of the tank body 1, and the feed port 4 is fixedly mounted on the input end of the first control valve 9. A feeding pipe 10 is also fixedly mounted on the output end of the first control valve 9. A liquid level gauge 11 is fixedly mounted on the rear of the top surface of the tank body 1. The controller 8 opens the first control valve 9 to allow the feeding pipe 10 to convey materials into the tank body 1 through the feed port 4, until the liquid level gauge 11 detects that the material in the tank body 1 reaches a preset value, and then closes the first control valve 9 to stop the feeding pipe 10 from conveying materials into the tank body 1. Similarly, after the liquid level gauge 11 detects that the material in the tank body 1 is lower than the preset value, the controller 8 reopens the first control valve 9 to convey materials into the tank body 1 through the feeding pipe 10.

[0023] like Figure 2 - Figure 3As shown, an air inlet 6 is fixedly installed on the top of the left side wall of the tank body 1, and an electric proportional valve 12 and a pressure reducing valve 13 are fixedly installed on the top surface of the tank body 1, a second connecting pipe 16 is fixedly installed between the output end of the electric proportional valve 12 and the air inlet 6, and a first connecting pipe 15 is fixedly installed between the input end of the electric proportional valve 12 and the output end of the pressure reducing valve 13, and a high-pressure gas delivery pipe 14 is also fixedly installed on the input end of the pressure reducing valve 13. When the high-pressure gas delivery pipe 14 delivers high-pressure gas source gas into the tank body 1, the controller 8 will control the electric proportional valve 12 to automatically reduce the pressure of the high-pressure gas source delivered by the high-pressure gas delivery pipe 14 through the pressure reducing valve 13, and quickly and constantly control it at the pressure setting value. After decompression, the gas enters the electric proportional valve 12 through the first connecting pipe 15, and then enters the tank body 1 from the air inlet 6 through the second connecting pipe 16, which can control the pressure loaded in the tank body 1, so as to quickly adjust and control the material output flow in the tank body 1, and can constitute a pressure control loop structure;

[0024] like Figure 2 - Figure 3 As shown, a discharge port 5 is fixedly installed at the bottom of the left side wall of the tank body 1, and the discharge port 5 is fixedly installed with the input end of the flow meter 17. A feed pipe 18 is also fixedly installed between the output end of the flow meter 17 and the input end of the second control valve 19. After the inside of the tank body 1 is squeezed by the gas, the material in the tank body 1 will be discharged to the feed pipe 18 through the discharge port 5. The controller 8 controls the opening of the second control valve 19 to transport the material to the designated equipment. During this process, the flow meter 17 will detect the flow rate of the material discharged from the tank body 1. At the same time, the controller 8 detects the output signal of the flow meter 17 and compares it with the set value, and then drives the pressure control circuit to stabilize the output flow rate of the material in the tank body 1 at the set flow value. In this way, it can be used as a flow control circuit structure to detect the output flow rate of the material in the tank body 1 and output the control set value to the pressure control circuit.

[0025] like Figure 4 As shown, the drive motor 20 is fixedly mounted on the bottom surface of the tank body 1, and a rotating plate 21 is fixedly mounted on the top surface of the output end of the drive motor 20, and scraper plates 22 that are close to the inner wall of the tank body 1 are also fixedly mounted on both side walls of the rotating plate 21. When adding material into the tank body 1, the controller 8 will control and start the drive motor 20, and the drive motor 20 will drive the output end to drive the rotating plate 21 to rotate, and the rotating plate 21 will drive the scraper plates 22 on both sides to rotate close to the inner wall of the tank body 1, and during the rotation, the material residue attached to the inner wall of the tank body 1 will be scraped off and fall into the tank body 1, which not only avoids material waste, but also prevents the material residue from affecting the pressure transmission of the closed-loop flow control mechanism 2 and the control of the flow.

[0026] The specific operating principle of the closed-loop flow control mechanism 2 is as follows: when the controller 8 controls the first control valve 9 to open, the feeding pipe 10 conveys the material into the tank body 1 through the feed port 4, and the liquid level meter 11 detects the material in the tank body 1. After reaching the preset value, the controller 8 controls the first control valve 9 to close. When the high-pressure gas delivery pipe 14 delivers high-pressure gas source gas to the tank body 1, the controller 8 will control the electric proportional valve 12 to automatically reduce the pressure of the high-pressure gas source delivered by the high-pressure gas delivery pipe 14 through the pressure reducing valve 13. After the pressure is reduced, the gas enters the electric proportional valve 12 through the first connecting pipe 15, and then enters the tank body 1 from the air inlet 6 through the second connecting pipe 16. After the high-pressure gas is filled in the tank body 1, the material in the tank body 1 will be squeezed, and the material will be discharged into the delivery pipe 18 through the feed port 4. The controller 8 will control the opening of the second control valve 19 to discharge the material in the delivery pipe 18 for use. During the process, the flow meter 17 will detect the flow discharged from the tank body 1, and the controller 8 will detect the output signal of the flow meter 17 and compare it with the set value. If the output signal is greater than the set value, it means that the material output flow rate is large, and the controller 8 will control the driving pressure control circuit to reduce the input of high-pressure gas into the tank body 1, so that the material output flow rate in the tank body 1 is stabilized at the set flow value. On the contrary, if the output signal is less than the set value, it means that the material output flow rate is small, and the controller 8 will control the driving pressure control circuit to increase the input of high-pressure gas into the tank body 1, so that the material output flow rate in the tank body 1 is stabilized at the set flow value. Thus, the output of the flow control circuit is used as the input of the pressure control circuit, and the pressure control circuit is used as the execution of the final flow control circuit, which can realize high-precision material flow control for the spraying equipment. The overall device structure is simple, and the cost of controlling the paint flow of the spraying equipment is reduced.

[0027] And further cooperate with the use of the scraper mechanism 3. When adding material into the tank body 1, the controller 8 will control and start the drive motor 20. The drive motor 20 will drive the output end to drive the rotating plate 21 to rotate. The rotating plate 21 will drive the scraper plates 22 on both sides to rotate close to the inner wall of the tank body 1, and in the process of rotation, the material residue attached to the inner wall of the tank body 1 will be scraped off and fall into the tank body 1, which not only avoids the waste of material, but also prevents the material residue from affecting the pressure transmission of the closed-loop flow control mechanism 2 and the control of the flow.

[0028] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, various improvements may be made to the present invention and its components may be replaced with equivalents, or some of its technical features may be replaced with equivalents without departing from the scope of the present invention. Anything within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A closed-loop flow control system, comprising a tank (1), characterized in that: The tank body (1) is provided with a closed-loop flow control mechanism (2), and the closed-loop flow control mechanism (2) includes a controller (8), an electric proportional valve (12), a pressure reducing valve (13), a flow meter (17) and a second control valve (19), wherein the controller (8) is fixedly connected to the top surface of the right support plate (7) of the tank body (1), and the electric proportional valve (12) and the pressure reducing valve (13) are both fixedly connected to the top surface of the tank body (1), a first connecting pipe (15) is further connected between the electric proportional valve (12) and the pressure reducing valve (13), and a second connecting pipe (15) is connected between the electric proportional valve (12) and the tank body (1). A second connecting pipe (16) is provided, wherein the flow meter (17) is connected to the discharge port (5) on the left side of the tank body (1), and a material delivery pipe (18) is connected between the flow meter (17) and the second control valve (19). A scraping mechanism (3) is further provided inside the tank body (1), and the scraping mechanism (3) comprises a driving motor (20), a rotating plate (21) and a scraping plate (22). The driving motor (20) is fixedly connected to the bottom surface of the tank body (1), and the rotating plate (21) is fixedly connected to the output end of the driving motor (20), and the scraping plate (22) is fixedly connected to both sides of the rotating plate (21).

2. A closed-loop flow control system according to claim 1, characterized in that: A support plate (7) is fixedly mounted on the bottom end of the right side wall of the tank body (1), and a controller (8) is fixedly mounted on the top surface of the support plate (7).

3. A closed-loop flow control system according to claim 2, characterized in that: A feed port (4) is fixedly mounted on the front end of the top surface of the tank body (1), and the feed port (4) is fixedly mounted on the input end of the first control valve (9). A feeding pipe (10) is also fixedly mounted on the output end of the first control valve (9). A liquid level meter (11) is fixedly mounted on the rear end of the top surface of the tank body (1).

4. A closed-loop flow control system according to claim 3, characterized in that: An air inlet (6) is fixedly mounted on the top of the left side wall of the tank body (1), and an electric proportional valve (12) and a pressure reducing valve (13) are fixedly mounted on the top surface of the tank body (1), a second connecting pipe (16) is fixedly mounted between the output end of the electric proportional valve (12) and the air inlet (6), and a first connecting pipe (15) is fixedly mounted between the input end of the electric proportional valve (12) and the output end of the pressure reducing valve (13), and a high-pressure gas delivery pipe (14) is also fixedly mounted on the input end of the pressure reducing valve (13).

5. A closed-loop flow control system according to claim 4, characterized in that: A discharge port (5) is fixedly installed at the bottom of the left side wall of the tank body (1), and the discharge port (5) is fixedly installed together with the input end of the flow meter (17). A feed pipe (18) is also fixedly installed between the output end of the flow meter (17) and the input end of the second control valve (19).

6. A closed-loop flow control system according to claim 5, characterized in that: The driving motor (20) is fixedly mounted on the bottom surface of the tank body (1), and a rotating plate (21) is fixedly mounted on the top surface of the output end of the driving motor (20). Scraping plates (22) that are in close contact with the inner wall of the tank body (1) are also fixedly mounted on both side walls of the rotating plate (21).

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