Spraying metering and proportioning device and control system thereof

Abstract

The application discloses a spraying metering and proportioning device and a control system thereof, wherein the spraying metering and proportioning device comprises a metering device, a mixer and a controller; the metering device is provided with at least two groups; each group of the metering device comprises a driving motor, a liquid supply pipeline, a liquid outlet pipeline and two groups of metering mechanisms; the driving motor is respectively connected with the two groups of metering mechanisms in a transmission mode to drive the two groups of metering mechanisms to act simultaneously; the driving motor and the metering mechanisms are electrically connected with the controller; the two ends of the liquid supply pipeline are respectively communicated with the input ends of the two groups of metering mechanisms; a liquid inlet is formed in the liquid supply pipeline; the two ends of the liquid outlet pipeline are respectively communicated with the output ends of the two groups of metering mechanisms; and a liquid outlet is formed in the mixing chamber of the mixer. The application has the advantages of high metering precision, low spraying cost, various functions, good cleaning effect and high intelligent degree.

Description

Technical Field

[0001] This invention relates to the field of spraying technology, and in particular to a spraying metering and mixing device and its control system. Background Technology

[0002] In the spray painting process, two or more components need to be pre-mixed and blended in a certain proportion to prepare the paint. Currently, metering pumps are mainly used to deliver the raw materials to the spray gun. Although this allows for the metering of the output fluid, the metering accuracy is low, the error range is large, and it easily leads to material waste and high spraying costs. Furthermore, since cleaning is required after each spray painting to prevent the paint from curing and clogging the pipeline, the current mixing and stirring devices are relatively complex in structure, making cleaning relatively troublesome and ineffective, requiring repeated cleaning, which is time-consuming and labor-intensive. Secondly, existing equipment also suffers from problems such as limited functionality, low level of automation, and cumbersome operation. Therefore, it is urgent to solve these problems. Summary of the Invention

[0003] The purpose of this invention is to provide a spraying metering and mixing device and its control system in order to solve the above-mentioned problems.

[0004] The present invention achieves the above-mentioned objectives through the following technical solution: a spraying metering and mixing device, comprising a metering device, a mixer, and a controller. The metering device is provided in at least two sets, each set of metering devices including a drive motor, a liquid supply pipe, a liquid outlet pipe, and two sets of metering mechanisms. The drive motor is respectively connected to the two sets of metering mechanisms to drive the two sets of metering mechanisms to operate simultaneously. The drive motor and the metering mechanisms are electrically connected to the controller. The two ends of the liquid supply pipe are respectively connected to the input ends of the two sets of metering mechanisms, and the liquid supply pipe has an inlet. The two ends of the liquid outlet pipe are respectively connected to the output ends of the two sets of metering mechanisms, and the liquid outlet pipe has an outlet. The mixer includes a mixing chamber, the mixing chamber is provided with at least two feeding channels, the feeding channels are connected to the liquid outlets one by one, and the mixing chamber has a mixing outlet.

[0005] Furthermore, each metering mechanism includes a mounting frame, a lead screw, and a piston rod. A piston cylinder is mounted on the mounting frame, and the drive motor is mounted on the mounting frame. One end of the lead screw is rotatably connected to the mounting frame, and the other end is fixedly connected to the output shaft of the drive motor. A lead screw nut is screwed onto the lead screw, connecting one end of the piston rod. The other end of the piston rod extends into the piston cylinder and is connected to a piston. The piston slides and seals against the inner cavity of the piston cylinder. The piston cylinder has an inlet and an outlet, with a first control valve and a second control valve correspondingly connected to the inlet and outlet. The first control valve is connected to the liquid supply pipe, and the second control valve is connected to the liquid outlet pipe. With the cooperation of the lead screw and lead screw nut, the rotational motion of the drive motor is converted into a linear motion along the axis. Since the thread pitch is known and the number of rotations of the drive motor can be controlled, the distance traveled by the piston can be accurately determined. The cylinder diameter of the piston cylinder is also known, thus allowing for accurate measurement of the output flow rate with relatively high precision.

[0006] Furthermore, the liquid inlet is connected to a color-changing valve assembly, which has at least two input ports. Each input port of the color-changing valve assembly is connected to a material tank. By controlling the opening and closing of the input ports of the color-changing valve assembly, more different raw materials can be input, making it possible to mix various paints, which is convenient for mixing and has a wider range of applications and is easy to operate.

[0007] Furthermore, a pulsation damper is connected between the liquid outlet and the feed channel. The pulsation damper includes a pressure sensor for monitoring fluid pressure, which is electrically connected to the controller. This ensures stable fluid pressure, avoids errors caused by pulsation, and improves measurement accuracy.

[0008] Furthermore, the pulsation damper also includes a valve seat and a valve cover, with a diaphragm pressed between the valve seat and the valve cover. The valve seat and the diaphragm together enclose a valve cavity. The valve seat has an inlet, an interface, a detection port, and a sampling port communicating with the valve cavity. A pressure sensor is connected to the detection port, and the detection end of the pressure sensor extends into the valve cavity. A sampling valve is connected to the sampling port, which is used to open and close the sampling port. An elastic element is abutted between the valve cover and the diaphragm. The valve cover has an adjustment mechanism, which is used to adjust the deformation of the elastic element. The deformation of the elastic element can be adjusted by the adjustment mechanism to better adapt to actual pulsations, better ensure the stability of fluid flow and pressure, and effectively improve the accuracy of measurement. Furthermore, the sampling port can be opened and closed by the sampling valve to allow fluid to flow out of the valve cavity. The accuracy of the actual output flow can be detected by the measuring device, which can play a role in calibrating the flow rate, improving the accuracy of the meter output, realizing multiple functions, with a simple and compact structure, convenient installation, and reduced cost.

[0009] Furthermore, a reflux valve assembly is provided between the pulsation damper and the mixer, and the reflux valve assembly is connected to the recovery container; this facilitates fluid recovery, allows the cleaning solvent to flow through, enables multi-stage cleaning, and provides convenient and effective cleaning.

[0010] Furthermore, the mixer also includes at least two switching valve groups, the output ports of which are connected to the feed channels one by one, the switching valve groups are connected to an air source, and the color-changing valve group and the return valve group are respectively connected to the switching valve groups to form a fluid circuit; making cleaning and operation convenient.

[0011] A control system for a spray metering and mixing device is also provided, comprising a drive module, operation buttons, and a display module electrically connected to the controller; the controller outputs control information to the drive module, the drive module receives and drives the drive motor to work according to the control information, the drive module is electrically connected to the drive motor, the drive module collects the status information of the drive motor and feeds it back to the controller, the controller compares the status information with the control information to correct the working status of the drive motor in real time; the controller calculates the real-time output flow rate according to the status information and presents it through the display module.

[0012] Furthermore, the display module also displays the working status of the mixer, the color-changing valve group, the reflux valve group, the pressure sensor, and the switching valve group; the working status of each component is displayed more intuitively, which is beneficial for maintenance and repair.

[0013] Furthermore, the controller is electrically connected to a monitoring module, which includes a liquid level sensor, a temperature sensor, and a flow meter. The liquid level sensor is used to monitor the liquid level in the material tank, and the temperature sensor is used to monitor the temperature in the material tank and / or the fluid circuit. The controller monitors various fluid data in real time to ensure that the fluid is always in the optimal spraying state, thereby ensuring better spraying quality.

[0014] The beneficial effects of this invention are as follows: First, by setting at least two sets of metering devices, the controller controls the operating speed of the corresponding drive motor according to the mixing ratio requirements, thereby allowing the fluid flow rate delivered to the mixer by each metering device to be different, so that multiple fluids present a certain proportion, meeting the mixing ratio requirements, and are mixed in the mixer in real time, mixing on demand without waste, effectively reducing costs; Second, under the control of the controller, the drive motor can rotate precisely, and its working state is fed back and corrected in real time, while parameters such as the screw thread and piston cylinder diameter are known, thus the metering results can be accurately obtained, effectively reducing errors and improving efficiency. The device offers several advantages: high accuracy in measurement; thirdly, the display module provides real-time updates on the operating status, allowing for quick feedback to staff. Staff can easily start / stop the device via operation buttons, enhancing intelligent operation convenience; fourthly, each metering unit is equipped with two metering mechanisms, ensuring uninterrupted fluid input and output, reducing errors caused by pulsation and improving measurement accuracy. Overall, this invention effectively achieves automatic mixing and real-time measurement of the output fluid with high accuracy. It also offers advantages such as reduced spraying costs, ease of operation, diverse functions, excellent cleaning effect, and high level of intelligence. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the fluid circuit connection of the present invention;

[0017] Figure 3 This is a schematic diagram of the meter in this invention;

[0018] Figure 4 This is a cross-sectional schematic diagram of the measuring instrument in this invention;

[0019] Figure 5 This is a cross-sectional view of the measuring instrument in this invention from another direction;

[0020] Figure 6 This is a schematic diagram of the pulsation damper in this invention;

[0021] Figure 7 This is an exploded view of the pulsation damper in this invention.

[0022] The annotations in the attached figures are explained as follows:

[0023] 1-Meter; 11-Drive motor; 12-Liquid supply pipe; 121-Liquid inlet; 13-Liquid outlet pipe; 131-Liquid outlet; 14-Metering mechanism; 141-Mounting bracket; 142-Lead screw; 143-Piston rod; 144-Piston cylinder; 1441-Inlet; 1442-Outlet; 145-Lead screw nut; 146-Piston; 147-First control valve; 148-Second control valve; 149-Ceramic sleeve; 15-Connecting block; 16-Slider; 17-Slide rail; 2-Mixer; 21-Mixing chamber; 211-Mixed liquid outlet; 22-Feed passage 1. Channel; 23-Switch valve assembly; 3-Controller; 31-Operation button; 32-Display module; 33-Indicator light; 4-Frame; 5-Color change valve assembly; 6-Material bucket; 7-Pulse damper; 71-Pressure sensor; 72-Valve seat; 721-Inlet; 722-Interface; 723-Detection port; 724-Sampling port; 73-Valve cover; 74-Diaphragm; 75-Valve cavity; 76-Sampling valve; 77-Elastic element; 78-Adjusting mechanism; 781-Baffle; 782-Screw; 783-Adjusting knob; 79-Mounting sleeve; 8-Return valve assembly; 9-Recovery container. Detailed Implementation

[0024] To facilitate understanding of the present invention, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "upper," "lower," "left," "right," "inner," "outer," and similar expressions used in this specification are for illustrative purposes only.

[0025] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0026] like Figures 1 to 7As shown, this embodiment provides a spraying metering and mixing device, including a metering device 1, a mixer 2, and a controller 3. The metering device 1 has at least two sets, each set of metering devices 1 including a drive motor 11, a liquid supply pipe 12, a liquid outlet pipe 13, and two sets of metering mechanisms 14. The drive motor 11 is respectively connected to the two sets of metering mechanisms 14 to drive the two sets of metering mechanisms 14 to operate simultaneously. The drive motor 11 and the metering mechanisms 14 are electrically connected to the controller 3. The two ends of the liquid supply pipe 12 are respectively connected to the input ends of the two sets of metering mechanisms 14, and the liquid supply pipe 12 has an inlet 121. The two ends of the liquid outlet pipe 13 are respectively connected to the output ends of the two sets of metering mechanisms 14, and the liquid outlet pipe 13 has an outlet 131. The mixer 2 includes a mixing chamber 21, and the mixing chamber 21 has at least two feeding channels 22, which are connected to the outlets 131 one by one. The mixing chamber 21 has a mixing outlet 211. Preferably, the meter 1 and the controller 3 are both mounted on the frame 4, and the mixer 2 is mounted at the end of the spraying robot arm; the drive motor 11 can be a stepper motor, a servo motor or other controllable motor, preferably a stepper motor.

[0027] Generally, two sets of metering devices 1 are set up. One set is used to measure the main component of the paint, and the other set is used to measure the curing agent. If the paint has more raw material components, more sets of metering devices 1 can be set up accordingly. The corresponding mixing chamber 21 is also set up with the same number of feeding channels 22.

[0028] Each metering mechanism 14 includes a mounting frame 141, a lead screw 142, and a piston rod 143. A piston cylinder 144 is mounted on the mounting frame 141. A drive motor 11 is mounted on the mounting frame 141. One end of the lead screw 142 is rotatably connected to the mounting frame 141, and the other end of the lead screw 142 is fixedly connected to the output shaft of the drive motor 11. A lead screw nut 145 is screwed onto the lead screw 142. The lead screw nut 145 is connected to one end of the piston rod 143. The other end of the piston rod 143 extends into the piston cylinder 144 and is connected to a piston 146. The piston 146 slides and seals against the inner cavity of the piston cylinder 144. The piston cylinder 144 has an inlet 1441 and an outlet 1442. A first control valve 147 and a second control valve 148 are connected to the inlet 1441 and the outlet 1442, respectively. The first control valve 147 is connected to the liquid supply pipe 12, and the second control valve 148 is connected to the liquid outlet pipe 13.

[0029] Specifically, the two piston rods 143 are connected and fixed together by a connecting block 15. The mounting bracket 141 is equipped with two limit switches electrically connected to the drive motor 11. The two limit switches are respectively located at both ends of the lead screw 142. Limiting plates opposite to the limit switches are fixed on the connecting block 15. This ensures automatic reversal of the drive motor 11, improving the switching speed, avoiding pulsation, and reducing measurement errors. Both ends of the lead screw 142 are rotatably connected to the mounting bracket 141 via bearings. Slider blocks 16 are symmetrically connected to both sides of the connecting block 15. A slide rail 17 adapted to the slider 16 is fixed on the mounting bracket 141. The slide rail 17 is parallel to the piston rods 143 to ensure smooth and reliable operation.

[0030] Preferably, a ceramic sleeve 149 is used to seal the inner wall of the piston cylinder 144 and the outer wall of the piston 146, which improves corrosion resistance, extends service life, allows for a wider range of applicable media, and reduces management and maintenance costs.

[0031] refer to Figure 5 As shown, in actual operation, the driving motor 11 of the measuring mechanism 14 works continuously, driving the lead screw 142 to rotate, causing the lead screw nut 145 to move up or down. Under the connection of the connecting block 15, the upper and lower piston rods 143 move synchronously, and the slider 16 slides relative to the slide rail 17.

[0032] When all piston rods 143 move upward, the upper piston 146 compresses the upper rodless chamber. At this time, the upper first control valve 147 closes and the upper second control valve 148 opens, allowing the fluid in the upper piston cylinder 144 to flow out through the corresponding outlet pipe 13 and outlet port 131. Simultaneously, the lower first control valve 147 opens and the lower second control valve 148 closes, allowing the fluid to flow into the rodless chamber of the lower piston cylinder 144 through the inlet port 121 and supply pipe 12. When the limit plate blocks the upper limit switch, the drive motor 11 rotates in the opposite direction, causing all piston rods 143 to move downward, thus causing the lower piston... The lower rodless chamber is compressed by valve 146. At this time, the lower first control valve 147 is closed and the lower second control valve 148 is opened. The fluid in the lower piston cylinder 144 flows out through the outlet pipe 13 and the outlet port 131. Simultaneously, the upper first control valve 147 is opened and the upper second control valve 148 is closed, allowing the fluid to flow through the inlet port 121 and the supply pipe 12 into the rodless chamber of the upper piston cylinder 144. When the limit plate blocks the lower limit switch, the drive motor 11 will rotate in the opposite direction. This reciprocating action allows for a continuous, pressurized, and quantitative output of fluid, effectively avoiding pulsation and ensuring stable pressure. It is worth mentioning that because the rotation angle of the drive motor 11 can be controlled, and closed-loop control of position, speed, and torque can be achieved, and parameters such as the threads of the lead screw 142 and the cylinder diameter of the piston cylinder 144 are known, the amount of fluid to be metered can be accurately controlled and fed back, achieving high-precision metering.

[0033] The liquid inlet 121 is connected to a color-changing valve assembly 5, which has at least two input ports. Each input port of the color-changing valve assembly 5 is connected to a material tank 6. By opening different input ports, the input raw materials can be changed, thereby changing the mixed output paint.

[0034] A pulsation damper 7 is connected between the liquid outlet 131 and the feed channel 22. The pulsation damper 7 includes a pressure sensor 71 for monitoring fluid pressure. The pressure sensor 71 is electrically connected to the controller 3. The pressure sensor 71 monitors the fluid pressure output by the meter 1 in real time and provides feedback to the controller 3 in real time. The controller 3 adjusts the operation of the drive motor 11 in real time based on the detected data to ensure stable pressure. The pulsation damper 7 also includes a valve seat 72 and a valve cover 73. A diaphragm 74 is pressed between the valve seat 72 and the valve cover 73. The valve seat 72 and the diaphragm 74 together enclose a valve cavity 75. The valve seat 72 has an inlet 721, an interface 722, a detection port 723, and a sampling port 724 that communicate with the valve cavity. A pressure sensor 71 is connected to the detection port 723. The detection end of the pressure sensor 71 extends into the valve cavity 75. A sampling valve 76 is connected to the sampling port 724. The sampling valve 76 is used to open and close the sampling port 724. An elastic element 77 is abutted between the valve cover 73 and the diaphragm 74. An adjustment mechanism 78 is provided on the valve cover 73. The adjustment mechanism 78 is used to adjust the deformation of the elastic element 77.

[0035] Specifically, the elastic element 77 is a cylindrical spring; the valve cover 73 is provided with a mounting sleeve 79 for connecting the adjusting mechanism 78. The adjusting mechanism 78 includes a baffle 781 and a screw 782. The baffle 781 is in a stop-fitting relationship with the mounting sleeve 79, and the baffle 781 abuts against one end of the elastic element 77. The outer wall of the baffle 781 slides against the inner wall of the mounting sleeve 79 and is in a non-rotating fit; one end of the screw 782 is screwed to the baffle 781, and the other end of the screw 782 extends out of the mounting sleeve 79 and is fixedly connected to an adjusting knob 783. A spring seat is fixedly connected to the diaphragm 74, and a mounting post protrudes from the spring seat. The other end of the elastic element 77 is sleeved on the mounting post, making the connection secure, improving the adjustment accuracy, and reducing errors.

[0036] refer to Figure 7 As shown, in actual operation, the adjustment knob 783 can be rotated to make the screw 782 rotate, and the baffle 781 moves up or down relative to the screw 782, while sliding relative to the inner wall of the mounting sleeve 79, thereby stretching or compressing the elastic element 77, changing its deformation, balancing the actual pulsating force, and ensuring the stability of fluid flow and pressure.

[0037] When it is necessary to calibrate whether the flow rate output of meter 1 is accurate, simply open the sampling valve 76, place the measuring cup at the sampling port 724 to catch the flowing liquid, let the fluid flow out for a period of time, and then calculate the flow rate based on the value of the measuring cup to determine if the flow rate is accurate; if it is inaccurate, adjust meter 1 until the flow rate output is correct. Thus, the flow rate output of the metering pump can be calibrated through the sampling valve 76 to improve accuracy.

[0038] A reflux valve assembly 8 is provided between the pulsation damper 7 and the mixer 2, and the reflux valve assembly 8 is connected to the recovery container 9.

[0039] The mixer 2 also includes at least two switching valve assemblies 23. The output ports of the switching valve assemblies 23 are connected to the feed channels 22 one-to-one. The switching valve assemblies 23 are connected to the air source. The color changing valve assembly 5 and the return valve assembly 8 are respectively connected to the switching valve assemblies 23 to form a fluid circuit. The mixing outlet 211 can be directly connected to the spray gun, or it can be connected to the spray gun through the static mixing core to improve the mixing effect.

[0040] The control system of the spraying metering and proportioning device includes a drive module, operation buttons 31, and a display module 32, all electrically connected to the controller 3. The controller 3 sends control information to the drive module, which receives and drives the drive motor 11 according to the control information. The drive module is electrically connected to the drive motor 11, collects the status information of the drive motor 11, and feeds it back to the controller 3. The controller 3 compares the status information with the control information to correct the working status of the drive motor 11 in real time, achieving closed-loop control, effectively reducing deviations, and improving metering accuracy. The controller 3 calculates the real-time output flow rate based on the status information and presents it through the display module 32. Preferably, the controller 3 uses a PLC as the main controller, which is highly efficient, has strong anti-interference stability, and rich control interfaces.

[0041] The display module 32 also displays the operating status of the mixer 2, color-changing valve group 5, reflux valve group 8, pressure sensor 71, and switching valve group 23. Preferably, the display module 32 uses a touch screen. The human-machine interface of the display module 32 has buttons corresponding to each valve group and can control the operation of each metering device 1 to adjust the drive motor 11 to a suitable speed to achieve the preset ratio. It can also record the adjusted ratio settings and define them as a formula. When the formula needs to be changed, only one-button operation is required to quickly change the formula, which is more efficient and intelligent (during the formula change process, the controller 3 will control the equipment to be cleaned at least once to avoid mixing with other paints and ensure the coating quality). For the metering device 1, the display module 32 displays the current flow rate, cumulative flow rate, number of times the piston cylinder 144 runs, speed of the drive motor 11, running time, etc., which is beneficial to the maintenance and upkeep of the equipment.

[0042] The controller 3 is electrically connected to a monitoring module, which includes a level sensor, a temperature sensor, and a flow meter. The level sensor monitors the liquid level in the material tank 6, and the temperature sensor monitors the temperature inside the material tank 6 and / or in the fluid circuit. Data monitored by the monitoring module is displayed on the display module 32, providing operators with a clear view of various status data. The controller 3 is also electrically connected to indicator lights 33, which provide a more intuitive indication of the equipment's current operating status. Additional indicator components such as buzzers can also be added. Furthermore, the controller 3 simultaneously checks the data monitored in real-time by the monitoring module to ensure they are within acceptable limits. If any abnormality occurs, the indicator lights 33 will indicate this, prompting operators to immediately stop the machine and perform maintenance.

[0043] It is worth mentioning that one of the material tanks 6 contains cleaning solvent. When the equipment needs to be cleaned, the corresponding input port of the color-changing valve group 5 is opened, and the cleaning solvent passes through the metering device 1, then through the return valve group 8. The corresponding output port of the return valve group 8 is opened, and the cleaning solvent flows directly into the recovery container 9 to clean the metering device 1 (i.e., front-end cleaning). The corresponding input port of the switching valve group 23 is opened, and the cleaning solvent passes through the mixer 2 and flows out from the mixed liquid outlet 211. Then, the corresponding input port of the corresponding switching valve group 23 is opened, allowing gas to pass through the mixer 2 for high-pressure rinsing to clean the mixer 2 (i.e., back-end cleaning). Correspondingly, the display module 32 is also equipped with a corresponding cleaning button, which can be operated multiple times to repeatedly clean the front and / or back ends to thoroughly clean the equipment and achieve better cleaning results.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of the invention. Those skilled in the art should understand that the invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection of the invention is defined by the appended claims and their equivalents.

Claims

1. A spraying metering and mixing device, characterized in that: The device includes a metering device, a mixer, and a controller. The metering device is provided in at least two sets. Each set of metering devices includes a drive motor, a liquid supply pipe, a liquid outlet pipe, and two sets of metering mechanisms. The drive motor is connected to the two sets of metering mechanisms to drive the two sets of metering mechanisms to operate simultaneously. The drive motor and the metering mechanisms are electrically connected to the controller. The two ends of the liquid supply pipe are respectively connected to the input ends of the two sets of metering mechanisms, and the liquid supply pipe has an inlet. The two ends of the liquid outlet pipe are respectively connected to the output ends of the two sets of metering mechanisms, and the liquid outlet pipe has an outlet. The mixer includes a mixing chamber with at least two feed channels, each feed channel being connected to a liquid outlet. The mixing chamber also has a liquid mixing outlet.

2. The spraying metering and proportioning device according to claim 1, characterized in that: Each of the metering mechanisms includes a mounting frame, a lead screw, and a piston rod. A piston cylinder is mounted on the mounting frame, and a drive motor is mounted on the mounting frame. One end of the lead screw is rotatably connected to the mounting frame, and the other end of the lead screw is fixedly connected to the output shaft of the drive motor. A lead screw nut is screwed onto the lead screw, and the lead screw nut is connected to one end of the piston rod. The other end of the piston rod extends into the piston cylinder and is connected to a piston. The piston slides and is sealed to the inner cavity of the piston cylinder. The piston cylinder has an inlet and an outlet. The inlet and the outlet are respectively connected to a first control valve and a second control valve. The first control valve is connected to the liquid supply pipeline, and the second control valve is connected to the liquid outlet pipeline.

3. The spraying metering and proportioning device according to claim 1, characterized in that: The liquid inlet is connected to a color-changing valve assembly, which has at least two input ports, and each input port of the color-changing valve assembly is connected to a material tank.

4. The spraying metering and proportioning device according to claim 3, characterized in that: A pulsation damper is connected between the liquid outlet and the feed channel. The pulsation damper includes a pressure sensor for monitoring fluid pressure, and the pressure sensor is electrically connected to the controller.

5. The spraying metering and proportioning device according to claim 4, characterized in that: The pulsation damper further includes a valve seat and a valve cover. A diaphragm is pressed between the valve seat and the valve cover. The valve seat and the diaphragm together enclose a valve cavity. The valve seat has an inlet, an interface, a detection port, and a sampling port that communicate with the valve cavity. A pressure sensor is connected to the detection port, and the detection end of the pressure sensor extends into the valve cavity. A sampling valve is connected to the sampling port and is used to open and close the sampling port. An elastic element is abutted between the valve cover and the diaphragm. An adjustment mechanism is provided on the valve cover and is used to adjust the deformation of the elastic element.

6. The spraying metering and proportioning device according to claim 4, characterized in that: A reflux valve assembly is provided between the pulsation damper and the mixer, and the reflux valve assembly is connected to the recovery container.

7. The spraying metering and proportioning device according to claim 6, characterized in that: The mixer also includes at least two switching valve groups, the output ports of which are connected to the feed channels one by one, the switching valve groups are connected to the air source, and the color changing valve group and the return valve group are respectively connected to the switching valve groups to form a fluid circuit.

8. The control system of the spraying metering and mixing device as described in any one of claims 1 to 7, characterized in that: It includes a drive module, operation buttons, and a display module, all electrically connected to the controller. The controller outputs control information to the drive module, the drive module receives and drives the drive motor to work according to the control information, the drive module is electrically connected to the drive motor, the drive module collects the status information of the drive motor and feeds it back to the controller, the controller compares the status information according to the control information to correct the working status of the drive motor in real time; The controller calculates the real-time output flow based on the status information and presents it through the display module.

9. The control system according to claim 8, characterized in that: The display module also displays the operating status of the mixer, the color-changing valve group, the reflux valve group, the pressure sensor, and the switching valve group.

10. The control system according to claim 8, characterized in that: The controller is electrically connected to a monitoring module, which includes a liquid level sensor, a temperature sensor, and a flow meter. The liquid level sensor is used to monitor the liquid level in the material tank, and the temperature sensor is used to monitor the temperature in the material tank and / or the fluid circuit.

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