Real stone paint spraying device

Abstract

The invention relates to the technical field of paint spraying, and discloses a real stone paint spraying device and a control method. The air pressure buffer tank is connected with the air pump unit; the real stone paint buffer tank is provided with a discharging nozzle, the discharging nozzle is communicated with the air pressure buffer tank, and a first flow control valve is arranged between the discharging nozzle and the air pressure buffer tank; the stirring tank is communicated with the real stone paint buffer tank, and a transmission pump and a second flow control valve are arranged between the stirring tank and the real stone paint buffer tank; the paint spraying nozzle is arranged at the discharging nozzle and communicates with the discharging nozzle; a third flow control valve is arranged between the paint spraying nozzle and the discharging nozzle; the pressure sensing unit is arranged at the bottom of the real stone paint buffer tank; and the control unit is electrically connected with the air pump unit, the first flow control valve, the transmission pump, the second flow control valve, the third flow control valve and the pressure sensing unit. The problems that in the prior art, the spraying air pressure and the paint amount are not stable, and the ideal spraying effect cannot be achieved are solved.

Description

Technical Field

[0001] This invention relates to the field of paint spraying technology, specifically to a stone paint spraying device. Background Technology

[0002] Stone paint spraying is a construction process in which stone paint is evenly applied to the wall surface using specialized spraying equipment. It can present a realistic stone texture and is widely used in building exterior wall decoration.

[0003] Existing stone paint spraying equipment suffers from unstable spraying air pressure or paint output, resulting in uneven thickness of the sprayed stone paint and failing to achieve the desired spraying effect.

[0004] Therefore, there is an urgent need for a device and control method for uniformly spraying stone paint on building exterior walls. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a stone paint spraying device that solves the problem of unstable air pressure and paint volume in existing stone paint spraying techniques, which prevents the achievement of ideal spraying results.

[0006] This invention provides a control method for a stone paint spraying device, which further ensures the stability of the spraying process by implementing closed-loop control of the total output of the spray nozzle.

[0007] According to one embodiment of the present invention, a stone paint spraying device is provided, comprising: an air pump unit; A pressure buffer tank is connected to the air pump unit; The real stone paint buffer tank has a discharge nozzle, which is connected to the air pressure buffer tank, and a first flow control valve is provided between the discharge nozzle and the air pressure buffer tank. A mixing tank is connected to the real stone paint buffer tank, and a transfer pump and a second flow control valve are provided between the mixing tank and the real stone paint buffer tank. A paint spray nozzle is located at the discharge nozzle and communicates with the discharge nozzle; a third flow control valve is provided between the paint spray nozzle and the discharge nozzle; A pressure sensing unit is located at the bottom of the stone paint buffer tank and is used to detect the pressure at the bottom of the stone paint buffer tank. The control unit is electrically connected to the air pump unit, the first flow control valve, the transfer pump, the second flow control valve, the third flow control valve, and the pressure sensing unit, respectively.

[0008] As one embodiment, the air pump unit includes: a first air pump and a second air pump; wherein, The first air pump and the second air pump are respectively connected to the air pressure buffer tank, and the first air pump and the second air pump are respectively electrically connected to the control unit; The control unit is used to coordinate the start-up, shutdown, and output power of the first and second air pumps based on the real-time air pressure in the air pressure buffer tank.

[0009] As one embodiment, the pressure sensing unit includes: a pressure strain gauge; wherein, The number of pressure strain gauges is at least three; The pressure strain gauges are evenly arranged in a ring around the bottom of the stone paint buffer tank, with the axis of the tank as the center.

[0010] As one embodiment, the mixing tank includes: a drive motor; The transmission rod has one end connected to the output end of the drive motor, and the other end is coaxially mounted with a first bevel tooth. A rotating shaft is coaxially rotatable with the mixing tank, and a second conical tooth is coaxially mounted on the bottom end of the rotating shaft, wherein the first conical tooth and the second conical tooth mesh with each other; A stirring element is connected to the rotating shaft and extends radially along the mixing tank.

[0011] As one embodiment, it also includes: A gear adjustment component is installed on the outer wall of the real stone paint buffer tank and is electrically connected to the control unit; The gear adjustment component is used to receive user input to adjust the output of the paint spray nozzle.

[0012] As one embodiment, a control method using a real stone paint spraying device is characterized by comprising: S1: The control unit controls the air pressure in the air pressure buffer tank to remain stable within the preset air pressure range; S2: Then, the first mass of real stone paint in the real stone paint buffer tank is calculated by using the first pressure value detected by the pressure sensing unit collected by the control unit; S3: The control unit determines whether the quality of the first stone paint is within the preset stone paint quality threshold range; S4: If the quality of the first real stone paint is within a preset range, control the first flow control valve to be in the first opening state and control the second flow control valve to be closed; If the quality of the first stone paint is lower than the preset range, the second flow control valve is controlled to be in the second opening state, and the first flow control valve is controlled to be closed. S5: The control unit determines the opening values ​​of the first flow control valve, the second flow control valve, and the third flow control valve according to the target paint output, and simultaneously determines the output power of the air pump unit and the transfer pump.

[0013] As an example, in step S5: The target paint output volume can be adjusted within 10%-90% of the volume of the stone paint buffer tank. The opening value adjustment range of the first flow control valve, the second flow control valve and the third flow control valve is 10%-90%, and the opening value of each flow control valve increases by 1% for every 1% increase in the target paint output.

[0014] As an example, in step S5: When the target paint output is between 10% and 35%, the output power of the air pump unit and the transfer pump is controlled to be 25% of their total power. When the target paint output is between 36% and 70%, the output power of the air pump unit and the transfer pump is controlled to be 50% of their total power. When the target paint output is between 71% and 90%, the output power of the air pump unit and the transfer pump is controlled to be 100% of their total power.

[0015] As an example, in step S4, the first opening state is 50% opening and the second opening state is 80% opening.

[0016] As an example, the control unit uses a PID algorithm to adjust the output of the air pump unit based on the difference between the real-time air pressure in the air pressure buffer tank and the target air pressure, so as to achieve closed-loop stable control of the air pressure.

[0017] Based on the above description and practice, it can be seen that the stone paint spraying device of the present invention improves the traditional spraying device into a combination device with a stone paint buffer tank and multiple flow control valves, which can effectively achieve uniform and stable output of spraying air pressure and paint volume. Specifically, the stone paint buffer tank ensures a more uniform and stable paint volume, preventing direct influence from the output pump and mixing tank. The mixing tank prevents the stone paint from solidifying, keeping it always in a pumpable state. The independent operation of air jetting and painting allows for individual control of the pressure and flow rate of each path, thus stabilizing air pressure and paint volume. The third flow control valve enables overall control of the total output port, i.e., the paint nozzle, further ensuring stable overall output.

[0018] By setting up a pressure sensing unit, the pressure of the stone paint in the buffer tank can be monitored in real time. The control unit calculates the amount of stone paint and compares it with the preset range to ensure that the amount of stone paint in the buffer tank is always within the preset range, thus ensuring that the pressure on the spray nozzle is stable. Attached Figure Description

[0019] Figure 1 This is a first-view structural schematic diagram of a stone paint spraying device according to an embodiment of the present invention.

[0020] Figure 2 This is a second-view structural schematic diagram of the stone paint spraying device involved in one embodiment of the present invention; Figure 3 This is a schematic diagram of the installation of the flow control valve of the stone paint spraying device according to one embodiment of the present invention; Figure 4 This is a schematic diagram of the stirring mechanism involved in one embodiment of the present invention; Figure 5 This is a flowchart of a stone paint spraying device according to one embodiment of the present invention.

[0021] The attached figures are labeled as follows: 1. Air pump unit; 101. First air pump; 102. Second air pump; 2. Air pressure buffer tank; 3. Stone paint buffer tank; 4. Mixing tank; 401. Transmission rod; 402. Rotating shaft; 403. Mixing component; 404. First conical tooth; 405. Second conical tooth; 5. First flow control valve; 6. Third flow control valve; 7. Second flow control valve; 8. Control unit; 9. Gear adjustment component. Detailed Implementation

[0022] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0023] Furthermore, the accompanying drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. It should be noted that in this disclosure, the terms "comprising," "configured with," and "set in" are used to indicate an open-ended inclusion, meaning that additional elements / components / etc. may exist besides those listed; the terms "first," "second," etc., are used only as labels and are not intended to limit the number or order of objects; the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0024] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] like Figures 1 to 4 As shown in the figure, this embodiment provides a specific structure for a stone paint spraying device that can achieve stable control of air pressure and paint volume.

[0026] like Figure 1 and Figure 2 As shown, the present invention mainly includes: an air pump unit 1, an air pressure buffer tank 2, a real stone paint buffer tank 3, a stirring tank 4, a first flow control valve 5, a third flow control valve 6, a second flow control valve 7, a control unit 8, and a pressure sensing unit.

[0027] Furthermore, the air pump unit 1 is responsible for generating compressed air. The air pressure buffer tank 2 is connected to the output end of the air pump unit 1 through a pipeline. It is used to store compressed air and buffer air pressure pulsations, so that the output air pressure is more stable. The stone paint buffer tank 3 is a sealed tank used to store the stone paint slurry to be sprayed. The stone paint buffer tank 3 has an inlet at the top that is connected to the mixing tank 4, and an outlet at the bottom. The outlet is divided into two paths through a T-junction or similar structure: one path is connected to the air pressure buffer tank 2 through a pipeline, and a first flow control valve 5 is installed on the pipeline; the other path leads to the paint nozzle, and a third flow control valve 6 is installed on this path. The paint nozzle is used to apply the paint directly to the exterior wall of the building.

[0028] The mixing tank 4 is connected to the inlet of the stone paint buffer tank 3 via a pipeline. It is equipped with an internal stirring mechanism for continuous or intermittent stirring of the stone paint, preventing pigment sedimentation and material solidification, and ensuring the uniformity and pumpability of the slurry. A transfer pump and a second flow control valve 7 are sequentially installed on the pipeline connecting the mixing tank 4 and the stone paint buffer tank 3. The transfer pump provides the power to pump the stone paint from the mixing tank 4 to the stone paint buffer tank 3, while the second flow control valve 7 is used to precisely control the flow rate of the replenished material.

[0029] The pressure sensing unit is fixedly installed on the inner or outer surface of the bottom of the stone paint buffer tank 3. The function of the pressure sensing unit is to sense the pressure generated at the bottom of the tank due to the gravity of the stone paint inside. This pressure value is directly related to the mass or liquid level of the stone paint inside the tank. The pressure sensing unit converts the sensed pressure signal into an electrical signal output.

[0030] The control unit 8 is typically implemented using a programmable logic controller (PLC), an industrial computer, or a high-performance microcontroller. The control unit 8 is electrically connected to the air pump unit 1, the first flow control valve 5, the transfer pump, the second flow control valve 7, the third flow control valve 6, and the pressure sensing unit via cable or wireless communication. The control unit 8 receives pressure signals from the pressure sensing unit and runs an internally preset control algorithm program to calculate the real-time paint volume in the stone paint buffer tank 3. Then, based on preset process parameters and user instructions, it sends control commands to each of the aforementioned actuators to adjust their operating states, thereby achieving closed-loop precise control of the spraying air pressure and paint volume, ensuring stable output.

[0031] In a preferred embodiment of the present invention, to further improve the reliability and adjustment range of the air pressure system, the air pump unit 1 adopts a dual-pump configuration. Specifically, the air pump unit 1 includes a first air pump 101 and a second air pump 102. The first air pump 101 and the second air pump 102 are connected in parallel, and the air outlets of both the first air pump 101 and the second air pump 102 are connected to the air pressure buffer tank 2 through pipelines. The first air pump 101 can be configured as the main pump, with a larger rated power and exhaust volume, responsible for providing basic air pressure and handling regular spraying flow rates; the second air pump 102 is configured as an auxiliary pump, which can be activated to supplement air volume during periods of high demand. The motor drivers for both the first air pump 101 and the second air pump 102 are electrically connected to the control unit 8.

[0032] Furthermore, the control unit 8 monitors the pressure inside the air pressure buffer tank 2 in real time via an air pressure sensor installed on the tank. When the air pressure is detected to be lower than the set target lower limit, the control unit 8 first starts or increases the speed of the first air pump 101. If the first air pump 101 has reached its maximum power but still cannot maintain the air pressure within the target range, the control unit 8 issues a command to start the second air pump 102, with both pumps working simultaneously to meet the high air consumption demand. Conversely, when the spraying operation decreases and the air pressure rises and exceeds the set upper limit, the control unit 8 first reduces the power of the second air pump 102 until it is shut down, and then the first air pump 101 alone maintains the system pressure. This ensures sufficient air pressure supply in extreme cases and saves energy in most operating conditions, improving system energy efficiency and stability.

[0033] To ensure the accuracy and reliability of pressure measurements and avoid single-point measurement errors caused by tank tilting or uneven paint distribution, the pressure sensing unit consists of at least three pressure strain gauges. The pressure strain gauges are preferably made of high-precision, corrosion-resistant diffused silicon or ceramic capacitive pressure sensing chips.

[0034] During installation, the three pressure strain gauges are arranged in a uniform circular array on the bottom plane of the stone paint buffer tank 3, with the vertical central axis of the tank as a virtual rotation axis. For example, when using three pressure strain gauges, they are spaced 120 degrees apart; if using four, they are spaced 90 degrees apart, and so on. Each pressure strain gauge is securely glued or installed on the bottom of the tank through a seal to ensure effective sensing of the pressure generated by the liquid column directly above it. The signal output lines of all pressure strain gauges are connected to the control unit 8.

[0035] When acquiring data, control unit 8 simultaneously reads the values ​​of all pressure strain gauges. During data processing, an averaging method can be used to perform an arithmetic average of the readings from multiple sensors to obtain a more comprehensive signal representing the overall liquid level and pressure. Alternatively, median filtering or more complex algorithms can be used to remove outliers that may be caused by bubbles, localized sedimentation, or occasional sensor malfunctions. The multi-sensor ring array design enhances the system's anti-interference capability and overall measurement accuracy in sensing the amount of paint inside the tank.

[0036] As attached Figure 4 As shown, the internal structure of the mixing tank 4 specifically includes a drive motor, a transmission rod 401, a rotating shaft 402, a stirring component 403, a first conical tooth 404, and a second conical tooth 405.

[0037] The drive motor serves as the power source, with its output shaft pointing vertically downwards. The upper end of the transmission rod 401 is directly connected to the output shaft of the drive motor via a coupling, rotating synchronously with the motor. The lower end of the transmission rod 401 extends into the mixing tank 4, and the first conical tooth 404 is coaxially fixedly installed at this end.

[0038] The rotating shaft 402 is the main shaft for stirring. It is coaxially rotated with the top cover and bottom wall of the stirring tank 4 through bearings at both ends. The bottom end of the rotating shaft 402 (i.e. the end located inside the tank) is also coaxially fixedly mounted with a second conical tooth 405. The first conical tooth 404 and the second conical tooth 405 mesh perpendicularly with each other. When the drive motor drives the transmission rod 401 and the first conical tooth 404 to rotate, the power is transmitted and changed 90 degrees through the meshing of this pair of bevel gears, thereby driving the rotating shaft 402 to rotate around its own axis.

[0039] The agitator 403 is fixedly connected to the rotating shaft 402. The agitator 403 can be designed in various forms such as paddle type, frame type, or anchor type. Its key feature is that it extends radially along the rotating shaft 402, that is, it extends towards the side wall of the mixing tank 4. When the rotating shaft 402 rotates, the agitator 403 rotates accordingly, generating a strong shearing and circulating effect on the stone paint slurry in the tank, effectively breaking up any clumps that may form, so that the pigments, fillers, and emulsions are mixed evenly, preventing sedimentation, and ensuring that the slurry is always in a uniform and usable flow state.

[0040] To facilitate flexible adjustment of the spraying effect by construction personnel according to actual site conditions, this invention adds a human-machine interface component to the device, as shown in the attached diagram. Figure 3 As shown, a gear adjustment component 9 is installed in an easily accessible location on the outer wall of the stone paint buffer tank 3. The gear adjustment component 9 can be a rotary encoder knob with scale indicators, a digital keypad, or a touch slider. The gear adjustment component 9 is electrically connected to the control unit 8 via a signal cable to receive manual input commands from the user. When the user rotates the knob or slides the slider, the gear adjustment component 9 generates a corresponding electrical signal and sends it to the control unit 8. The internal program of the control unit 8 interprets this signal into a specific "target paint output" setting value. Based on this target value, the control unit 8 automatically calculates the required valve opening degree and pump power, and controls the actuators to reach that state.

[0041] The present invention also provides a control method specifically for the above-mentioned spraying device, which is automatically executed by the control unit 8 and specifically includes the following steps: S1: The control unit 8 controls the air pressure in the air pressure buffer tank 2 to be kept stable within the preset air pressure range; S2: Then, by collecting the first pressure value detected by the pressure sensing unit collected by the control unit 8, the first mass of real stone paint in the real stone paint buffer tank 3 is calculated; S3: The control unit 8 determines whether the quality of the first stone paint is within the preset stone paint quality threshold range; S4: If the quality of the first real stone paint is within the preset range, control the first flow control valve 5 to be in the first opening state and control the second flow control valve 7 to be closed. If the quality of the first real stone paint is lower than the preset range, the second flow control valve 7 is controlled to be in the second opening state, and the first flow control valve 5 is controlled to be closed. S5: The control unit 8 determines the opening values ​​of the first flow control valve 5, the second flow control valve 7, and the third flow control valve 6 according to the target paint output, and simultaneously determines the output power of the air pump unit 1 and the transfer pump.

[0042] For example, in step S1, the control unit 8 adjusts the rotation speed of the first air pump 101 using a PID algorithm to stabilize the pressure inside the air pressure buffer tank 2 at 0.55 MPa. In step S2, the control unit 8 collects signals from three pressure strain gauges (pressure sensing units), takes the average value, and substitutes it into the formula m=(P·S) / g to calculate the mass of paint in the stone paint buffer tank 3.

[0043] Specifically, after the device is powered on and started, the control unit 8 first executes the initialization program. The control unit 8 sends a start command to the air pump unit and, based on the feedback from the air pressure sensor installed on the air pressure buffer tank 2, adjusts the speed of the air pump through the PID (proportional-integral-derivative) control algorithm so that the pressure in the air pressure buffer tank 2 quickly reaches and stabilizes within the preset target air pressure range. At the same time, the control unit 8 puts the transfer pump, the first flow control valve 5, the second flow control valve 7, the third flow control valve 6, etc., into a safe initial state and completes the self-test of the pressure sensing unit. When all system states are normal and the air pressure is stable, the initialization is completed and the device enters the standby state.

[0044] During the spraying operation or while in standby mode, the control unit 8 continuously or periodically collects pressure signals from the pressure sensing unit (i.e., multiple pressure strain gauges). The control unit 8 filters and processes the collected pressure values ​​to obtain the "first pressure value" P, representing the current uniform pressure at the bottom of the tank. According to the principle of fluid statics, the pressure P of the liquid on the bottom of the container is related to the liquid column height h, the liquid density ρ, and the gravitational acceleration g (P=ρgh). Since the cross-sectional area S of the stone paint buffer tank 3 is fixed, the mass of the stone paint in the tank is m=ρ·(S·h)=(P·S) / g. The control unit 8 has a pre-stored value of the effective area S of the tank bottom. Using the formula mass m=(pressure P×tank bottom area S) / gravitational acceleration g, the "first stone paint mass" m in the stone paint buffer tank 3 can be calculated in real time. This calculation process is continuous or periodic, allowing the control unit 8 to always monitor the remaining amount of paint in the tank.

[0045] Furthermore, the control unit 8 has a preset reasonable threshold range for the quality of the real stone paint. The control unit 8 compares the calculated first quality m of the real stone paint with this threshold range to make a judgment.

[0046] Transfer pump case 1: If m is in [m] min m max Within this range, it indicates that the amount of paint in the tank is moderate, and there is no need to replenish a large amount of paint from the mixing tank 4. The paint required for spraying can be directly supplied from the current stock in the buffer tank. At this time, the control unit 8 controls the second flow control valve 7 to be closed, stopping the replenishment from the mixing tank 4. At the same time, in order to maintain the pressure balance in the tank and provide power for spraying, the first flow control valve 5 is controlled to open to a moderate "first opening state", such as 50% opening, allowing a stable flow of compressed air to enter the top of the stone paint buffer tank 3 from the air pressure buffer tank 2, applying pressure to the paint.

[0047] Case 2: If m is less than m min or greater than m max This indicates that the paint level in the tank is too low or too high. Taking low paint level as an example, the control unit 8 controls the first flow control valve 5 to be closed, temporarily cutting off the pressurized air path. At the same time, it controls the second flow control valve 7 to open to a higher "second opening state", such as 80% opening, and starts the transfer pump to quickly pump the prepared stone paint in the mixing tank 4 into the stone paint buffer tank 3 at a larger flow rate until the paint level recovers to the threshold range, and then the system switches back to the state of case one.

[0048] According to the established control logic or mapping table, control unit 8 determines the opening values ​​K1, K2, and K3 of three key valves—the first flow control valve 5, the second flow control valve 7, and the third flow control valve 6—based on the target paint output Q. Simultaneously, based on the output volume and the requirements for maintaining system pressure and flow, it determines the required output power W of air pump unit 1. _pump And the output power W of the transfer pump (during feeding). _transfer The control unit 8 then sends corresponding control signals to each valve driver, air pump motor driver, and transfer pump driver, so that the entire system dynamically adjusts to the optimal operating point that matches the target output, thereby ensuring that the sprayed paint mist maintains stable pressure and flow regardless of the amount of paint sprayed.

[0049] The target paint output Q is set and adjusted between 10% and 90% of the effective volume of the stone paint buffer tank 3. The target paint output Q actually corresponds to the proportion of flow rate per unit time to the tank's stable supply capacity. In conjunction with this, the opening values ​​K1, K2, and K3 of the first flow control valve 5, the second flow control valve 7, and the third flow control valve 6 are also set to an adjustment range of 10% to 90%, where 0% represents fully closed and 100% represents fully open, but the maximum effective adjustment range is 10%-90%.

[0050] The control unit 8 establishes a simple linear correspondence: for every 1% increase (or decrease) in the target paint output Q, the opening values ​​K1, K2, and K3 of the first flow control valve 5, the second flow control valve 7, and the third flow control valve 6, which need to be regulated, also increase (or decrease) by 1% respectively. For example, when the user sets the target paint output to 50%, the control unit 8 adjusts the opening of the relevant valves (which may be the first and third valves, or the second and third valves, depending on the replenishment status) to approximately 50%. This "proportional following" control method makes the system response intuitive and predictable, simplifies the control algorithm, and ensures that the change in fluid path resistance characteristics is relatively linear over a wide operating range, which is beneficial for maintaining system stability.

[0051] In step S5, the control unit 8 adjusts the output power of the air pump unit 1 and the transfer pump in stages. The switching threshold of the power stage is directly linked to the range of the target paint output Q. When the target paint output Q is in the lower range of 10% to 35%, the required air consumption and paint delivery are both small. At this time, the control unit 8 controls the air pump unit 1 and the transfer pump to operate at about 25% of their rated total power. For example, if the total power of the air pump unit is 8 kW and the power of the transfer pump is 2 kW, then the target power of the air pump unit in this stage is about 2 kW, and the target power of the transfer pump is about 0.5 kW.

[0052] When the target paint output Q is increased to a medium range of 36% to 70%, system requirements increase. Control unit 8 accordingly increases the output power of air pump unit 1 and transfer pump to approximately 50% of their respective total rated power.

[0053] When the target paint output Q further increases to a high range of 71% to 90%, large-area rapid spraying is required. At this time, the control unit 8 controls the air pump unit 1 and the transfer pump to operate at 100% full power of the rated total power, that is, the air pump unit 8 kW and the transfer pump 2 kW, to provide maximum power output and ensure that the air pressure and paint volume do not decrease under high flow rate.

[0054] The power distribution settings for output enable on-demand energy allocation, achieving energy saving and consumption reduction while ensuring coating performance.

[0055] In step S4, to ensure the effectiveness and stability of the control response, the first opening state is preferably set to 50%. When the amount of paint in the tank is moderate and only the spraying pressure needs to be maintained, opening the first flow control valve 5 to 50% provides a moderate and stable airflow. This avoids insufficient pressure on the paint due to an excessively small opening, and also prevents the pressure in the air pressure buffer tank 2 from dropping too quickly or causing airflow disturbances due to an excessively large opening. The second opening state is preferably set to 80%. When it is necessary to quickly replenish the stone paint buffer tank 3 from the mixing tank 4, the second flow control valve 7 is opened to 80%. In conjunction with the operation of the transfer pump, a larger replenishment channel can be formed, achieving relatively rapid liquid level recovery and shortening the replenishment waiting time. At the same time, it is not fully open, leaving a certain margin for flow control and helping to reduce hydraulic shock when the pump starts.

[0056] Furthermore, the control unit 8 employs a PID closed-loop control algorithm to adjust the output of the air pump unit 1. Specifically, the control unit 8 continuously reads the "real-time air pressure" P in the air pressure buffer tank 2 via an air pressure sensor. actual And compare it with the "target air pressure" P set by the user or program. target By comparison, the pressure deviation e=P is calculated. target -P_ actual The PID control algorithm calculates the control output u based on the deviation e and the change and accumulation of the deviation over time using a preset formula. The output u determines what command the control unit 8 should send to the air pump unit 1 to adjust its motor speed. For example, when the actual air pressure is lower than the target value (e>0), the PID algorithm outputs an increased u value, and the control unit 8 accordingly increases the air pump speed, increasing the exhaust volume and raising the air pressure. Conversely, when the actual air pressure is too high (e<0), the algorithm outputs a decreased u value, and the control unit 8 reduces the air pump speed, causing the air pressure to drop. Through a closed-loop process of real-time monitoring, feedback, calculation, and adjustment, regardless of fluctuations in air consumption during the spraying operation, the pressure in the air pressure buffer tank 2 can be automatically, quickly, and accurately maintained within a small fluctuation range near the target value, thus providing a solid guarantee for the stable pressure delivery of the downstream stone paint. The parameters of the PID algorithm (proportional coefficient, integral time, derivative time) can be tuned and optimized in the control unit 8 to adapt to the characteristics and operating requirements of different devices.

[0057] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A stone paint spraying device, characterized in that, include: Air pump unit; A pressure buffer tank is connected to the air pump unit; The real stone paint buffer tank has a discharge nozzle, which is connected to the air pressure buffer tank, and a first flow control valve is provided between the discharge nozzle and the air pressure buffer tank. A mixing tank is connected to the real stone paint buffer tank, and a transfer pump and a second flow control valve are provided between the mixing tank and the real stone paint buffer tank. A paint spray nozzle is located at the discharge nozzle and communicates with the discharge nozzle; a third flow control valve is provided between the paint spray nozzle and the discharge nozzle; A pressure sensing unit is located at the bottom of the stone paint buffer tank and is used to detect the pressure at the bottom of the stone paint buffer tank. The control unit is electrically connected to the air pump unit, the first flow control valve, the transfer pump, the second flow control valve, the third flow control valve, and the pressure sensing unit, respectively.

2. The stone paint spraying device as described in claim 1, characterized in that, The air pump unit includes: a first air pump and a second air pump; wherein... The first air pump and the second air pump are respectively connected to the air pressure buffer tank, and the first air pump and the second air pump are respectively electrically connected to the control unit; The control unit is used to coordinate the start-up, shutdown, and output power of the first and second air pumps based on the real-time air pressure in the air pressure buffer tank.

3. The stone paint spraying device as described in claim 1, characterized in that, The pressure sensing unit includes: a pressure strain gauge; wherein... The number of pressure strain gauges is at least three; The pressure strain gauges are evenly arranged in a ring around the bottom of the stone paint buffer tank, with the axis of the tank as the center.

4. The stone paint spraying device as described in claim 1, characterized in that, The mixing tank includes: a drive motor; The transmission rod has one end connected to the output end of the drive motor, and the other end is coaxially mounted with a first bevel tooth. A rotating shaft is coaxially rotatable with the mixing tank, and a second conical tooth is coaxially mounted on the bottom end of the rotating shaft, wherein the first conical tooth and the second conical tooth mesh with each other; A stirring element is connected to the rotating shaft and extends radially along the mixing tank.

5. The stone paint spraying device as described in claim 1, characterized in that, Also includes: A gear adjustment component is installed on the outer wall of the real stone paint buffer tank and is electrically connected to the control unit; The gear adjustment component is used to receive user input to adjust the output of the paint spray nozzle.

6. A control method using a stone paint spraying device as described in any one of claims 1-5, characterized in that, include: S1: The control unit controls the air pressure in the air pressure buffer tank to remain stable within the preset air pressure range; S2: Then, the first mass of real stone paint in the real stone paint buffer tank is calculated by using the first pressure value detected by the pressure sensing unit collected by the control unit; S3: The control unit determines whether the quality of the first stone paint is within the preset stone paint quality threshold range; S4: If the quality of the first real stone paint is within a preset range, control the first flow control valve to be in the first opening state and control the second flow control valve to be closed; If the quality of the first stone paint is lower than the preset range, the second flow control valve is controlled to be in the second opening state, and the first flow control valve is controlled to be closed. S5: The control unit determines the opening values ​​of the first flow control valve, the second flow control valve, and the third flow control valve according to the target paint output, and simultaneously determines the output power of the air pump unit and the transfer pump.

7. The control method as described in claim 6, characterized in that, In step S5: The target paint output volume can be adjusted within 10%-90% of the volume of the stone paint buffer tank. The opening value adjustment range of the first flow control valve, the second flow control valve and the third flow control valve is 10%-90%, and the opening value of each flow control valve increases by 1% for every 1% increase in the target paint output.

8. The control method as described in claim 6, characterized in that, In step S5: When the target paint output is between 10% and 35%, the output power of the air pump unit and the transfer pump is controlled to be 25% of their total power. When the target paint output is between 36% and 70%, the output power of the air pump unit and the transfer pump is controlled to be 50% of their total power. When the target paint output is between 71% and 90%, the output power of the air pump unit and the transfer pump is controlled to be 100% of their total power.

9. The control method as described in claim 6, characterized in that, In step S4, the first opening state is 50% opening, and the second opening state is 80% opening.

10. The control method as described in claim 6, characterized in that, The control unit uses a PID algorithm to adjust the output of the air pump unit based on the difference between the real-time air pressure in the air pressure buffer tank and the target air pressure, so as to achieve closed-loop stable control of the air pressure.

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