Plate continuous cleaning device with adjustable spraying and drying unit and method

Abstract

The invention relates to a plate continuous cleaning device and method with an adjustable spraying and drying unit, and belongs to the technical field of precise cleaning and drying, and the plate continuous cleaning device and method comprises the steps that S1, a main body frame, a supporting conveying piece, a Bernoulli self-suspension cleaning assembly and a sound wave desorption drying assembly are deployed; s2, a conveying channel is widened, horizontal displacement and rotation of a spray head are limited through a vertical guide mechanism, and only the vertical freedom degree is reserved; s3, introducing liquid to establish a Bernoulli negative pressure suspension gap, driving the piezoelectric array to generate an ultrasonic cavitation field, and locking a resonance point based on impedance feedback; and S4, high-strength air ultrasound is utilized to enable a water film interface to oscillate and dewet, and then water drops are stripped through high-speed laminar flow of a Coanda air knife. According to the scheme, passive follow-up of the spray head to fluctuation of the surface appearance of the plate is achieved, and the problem of uneven cleaning or collision risk caused by warping of the plate is effectively solved.

Description

Technical Field

[0001] This invention relates to the field of precision cleaning and drying, specifically to a continuous cleaning device and method for sheet metal with adjustable spray and drying units. Background Technology

[0002] In the production of sheet metal, traditional sheet cleaning methods mainly rely on nozzles with fixed spacing and hot air drying processes. These methods often face problems such as unclear mechanical actuation logic and isolated parameter adjustments, resulting in poor adaptability to sheets of different specifications, thicknesses, and slight warping. This situation means that during the cleaning process, the distance between the nozzle and the sheet cannot be dynamically compensated according to the real-time condition of the sheet, which can easily create cleaning dead zones or cause mechanical collisions, affecting the uniformity of cleaning.

[0003] In addition, traditional drying technology is not effective at removing moisture from micropores or deep pores on the surface of boards. It mainly relies on physical blowing and cannot effectively overcome the capillary force within the micropores. Due to the lack of coordinated control between physical fields, the acoustic energy and airflow energy in the drying process often cannot be precisely aligned in the spatiotemporal dimension, resulting in low drying efficiency and failing to meet the stringent requirements of high-precision boards for surface cleanliness and dryness.

[0004] The aforementioned shortcomings are mainly due to the excessive rigidity of the mechanical structure and the lack of a multi-physics coupling mechanism. The fixed nozzle installation method is difficult to cope with the real-time displacement changes of the board material, and lacks a frequency tracking and power protection mechanism based on real-time physical parameter feedback. This causes the electroacoustic conversion efficiency of the system to drop significantly when the load fluctuates, and there is even a risk of overheating and damaging the hardware. Summary of the Invention

[0005] The purpose of this invention is to provide a continuous cleaning device and method for sheet materials with adjustable spraying and drying units, in order to solve the problems mentioned in the background art. Specifically, the technical solution of this invention is as follows: A continuous cleaning method for sheet materials with adjustable spray and drying units includes: S1. A main frame, a main support and conveying assembly, a Bernoulli self-suspended cleaning assembly, and an acoustic desorption drying assembly are set up. The Bernoulli self-suspended cleaning assembly and the acoustic desorption drying assembly are sequentially arranged on the main frame along the conveying direction of the plate. The Bernoulli self-suspended cleaning assembly includes an acoustic-flow coupling nozzle, and the acoustic desorption drying assembly includes a focused air ultrasonic generator and a Coanda effect air knife. S2. Adjust the width of the conveying channel of the main support and conveying component by means of the width adjustment module, and set a vertical guide mechanism above the acoustic-flow coupling nozzle. The vertical guide mechanism restricts the displacement and rotation of the acoustic-flow coupling nozzle in the horizontal plane, and only retains the vertical direction of movement freedom. S3. Start the conveying process and introduce the cleaning fluid into the acoustic-flow coupling nozzle. Establish a Bernoulli negative pressure suspension gap between the acoustic-flow coupling nozzle and the plate. At the same time, drive the piezoelectric transducer array inside the acoustic-flow coupling nozzle to generate an ultrasonic cavitation field. The main controller fine-tunes the driving frequency in real time according to the impedance feedback to lock the resonance point. S4. The board enters the drying zone, where the high-intensity air ultrasonic waves generated by the focused air ultrasonic generator cause the water film on the surface and in the pores of the board to oscillate and dewetting. Then, the high-speed laminar airflow generated by the Coanda effect air knife peels off the unstable water droplets.

[0006] Preferably, step S2 further includes: The liquid supply line is connected to the acoustic-fluid coupling nozzle via a flexible corrugated pipe, wherein the axial stiffness of the flexible corrugated pipe satisfies the mechanical equilibrium condition: within the maximum extension stroke, the sum of the elastic restoring force of the flexible corrugated pipe and the frictional resistance of the vertical guide mechanism is less than the minimum negative pressure adsorption force generated by the cleaning fluid under the Bernoulli effect.

[0007] Preferably, in step S3, the frequency adjustment logic of the main controller includes: The dynamic impedance signal of the piezoelectric transducer array is monitored in real time by an impedance analyzer. An extreme value search is performed based on the zero-crossing point of the impedance phase angle. When the acoustic load fluctuation caused by the change of the suspension gap is detected, the output frequency is automatically adjusted to the new resonant frequency point of the overall system.

[0008] Preferably, step S3 further includes flow resistance thermal balance protection logic: When the impedance analyzer detects that the rising slope of the real part of the impedance exceeds the preset threshold for sudden change in flow resistance, it determines that the gap is compressed and there is a risk of overheating. The main controller immediately performs exponential reverse decay of the drive voltage. After the rate of change of impedance returns to normal, the control voltage rises back along a linear ramp.

[0009] Preferably, in step S4, the timing control of the Kornda effect air knife includes: The main controller acquires the real-time linear speed of the conveyor rollers, calculates the time difference based on the physical distance between the focused air ultrasonic generator and the Coanda effect air knife, and controls the Coanda effect air knife to release airflow during the surface tension failure window of the water film.

[0010] A continuous cleaning device for sheet metal with adjustable spraying and drying units includes: Main framework; The main support and conveying assembly is mounted on the main frame and is used to convey the sheet metal. A Bernoulli self-suspended cleaning assembly is disposed in the wet treatment area of ​​the main frame, including an acoustic-fluid coupling nozzle capable of generating a Bernoulli negative pressure field and an ultrasonic cavitation field. The acoustic desorption drying component is disposed in the dry treatment area of ​​the main frame, and is located downstream of the Bernoulli self-suspension cleaning component; The control and feedback unit is used to monitor cleaning parameters and coordinate the operation of various components.

[0011] Preferably, the Bernoulli self-suspended cleaning assembly further includes: A vertical guide mechanism, with its stator fixed to the main frame and its mover connected to the acoustic-fluid coupling nozzle, is used to constrain the nozzle's motion trajectory. A flexible corrugated pipe is sleeved outside the vertical guide mechanism or arranged in parallel to it, serving as a sealed channel for fluid and cable. Its upper end is connected to a rigid pipe, and its lower end is connected to the acoustic-fluid coupling nozzle.

[0012] Preferably, the main support and transmission component includes: Conveyor rollers are rotatably mounted on both sides of the main frame; The width adjustment module, installed above the main frame, includes a bidirectional trapezoidal lead screw and a backlash-eliminating nut, used to drive the limiting baffle to move synchronously in opposite directions along the linear guide rail to adjust the width of the transmission channel.

[0013] Preferably, the acoustic desorption drying assembly includes: A focused air ultrasonic generator, comprising a parabolic reflector and a Hartmann whistle located at the focal point, with the emission port tilted toward the surface of the plate; The Coanda effect air knife is located immediately downstream of the focused air ultrasonic generator, and its air outlet is an asymmetrical curved surface.

[0014] Preferably, the control and feedback unit includes an impedance analyzer connected in series in the drive circuit and a main controller connected to the gas supply unit.

[0015] Compared with the prior art, the present invention has the following improvements and advantages: 1. This solution utilizes the Bernoulli negative pressure effect in conjunction with a vertical guide mechanism to achieve passive follow-up of the nozzle to fluctuations in the surface morphology of the board. The axial stiffness constraint of the flexible bellows ensures that the nozzle can respond sensitively to changes in fluid pressure, maintaining a micron-level gap without external power, effectively solving the problem of uneven cleaning or collision risks caused by board warping; 2. This scheme uses an impedance analyzer to monitor the zero-crossing point of the phase angle of the piezoelectric transducer array in real time. The main controller performs extreme value search and fine-tunes the driving frequency based on impedance feedback. This dynamic tracking mechanism ensures that the system remains locked at the resonant frequency point regardless of changes in the liquid film thickness, guaranteeing the stability of the ultrasonic cavitation field intensity. 3. This solution introduces protection logic based on the rising slope of the real part of the impedance. When the slope exceeds the current resistance mutation threshold, the system determines it as an overheating precursor and executes an exponential reverse decay of the voltage. Compared to traditional thermal relay protection, this predictive mechanism based on electrical signal feedback achieves a response speed in milliseconds, protecting the transducer hardware while avoiding the impact of thermal damage on the board material quality. 4. This solution establishes the sequence of acoustic dewetting and airflow stripping through physical position constraints and timing control. It utilizes a focused air ultrasonic generator to disrupt surface tension, combined with the laminar shear force of the Coanda effect air knife, to remove moisture within the window of water film failure. This real-time supplementary transmission logic based on conveyor speed and physical spacing significantly improves the drying efficiency of high-ratio boards. 5. This solution achieves precise matching between the width of the transmission channel and the specifications of the board material; this not only prevents the board material from tilting during high-speed transmission, but also ensures that the center line of the board material coincides with the acoustic coupling area, providing a stable process benchmark for subsequent precision cleaning and drying. Attached Figure Description

[0016] The present invention will be further explained below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the overall external structure of the device; Figure 2 This is a schematic diagram of the Bernoulli self-suspension cleaning assembly; Figure 3 This is a schematic diagram of the acoustic desorption drying component and the control and feedback unit. Figure 4 This is a schematic diagram of the process flow of the method of the present invention.

[0017] In the diagram: 10. Main frame; 100. Main support and conveying assembly; 110. Conveying roller conveyor; 120. Width adjustment module; 200. Bernoulli self-suspended cleaning assembly; 210. Flexible corrugated pipe; 220. Acoustic-fluid coupling nozzle; 222. Piezoelectric transducer array; 230. Vertical guide mechanism; 300. Acoustic desorption drying assembly; 310. Focusing air ultrasonic generator; 320. Coanda effect air knife; 330. Air supply unit; 400. Control and feedback unit; 410. Impedance analyzer; 430. Main controller. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. Example

[0019] Please see Figure 1-4This invention provides a continuous cleaning method for sheet metal with adjustable spraying and drying units, comprising: S1. Set up a main frame 10, a main support and conveying assembly 100, a Bernoulli self-suspended cleaning assembly 200 and an acoustic desorption drying assembly 300. The Bernoulli self-suspended cleaning assembly 200 and the acoustic desorption drying assembly 300 are arranged sequentially on the main frame 10 along the conveying direction of the plate. The Bernoulli self-suspended cleaning assembly 200 includes an acoustic-flow coupling nozzle 220, and the acoustic desorption drying assembly 300 includes a focused air ultrasonic generator 310 and a Coanda effect air knife 320. The focused air ultrasonic generator 310 is equipped with a Hartmann whistle. S2. The width of the transmission channel of the main support and the transmission component 100 is adjusted by the width adjustment module 120, and a vertical guide mechanism 230 is set above the acoustic-flow coupling nozzle 220. The vertical guide mechanism 230 restricts the displacement and rotation of the acoustic-flow coupling nozzle 220 in the horizontal plane, and only retains the vertical direction of movement freedom. S3. Start the transmission and introduce the cleaning fluid into the acoustic-flow coupling nozzle 220 to establish a Bernoulli negative pressure suspension gap between the acoustic-flow coupling nozzle 220 and the board. At the same time, drive the piezoelectric transducer array 222 inside the acoustic-flow coupling nozzle 220 to generate an ultrasonic cavitation field. The main controller 430 finely adjusts the driving frequency in real time according to the impedance feedback to lock the resonance point. S4. The board enters the drying zone. The high-intensity air ultrasonic waves generated by the focused air ultrasonic generator 310 cause the water film on the surface and in the pores of the board to oscillate and dewetting. Then, the high-speed laminar airflow generated by the Coanda effect air knife 320 peels off the unstable water droplets.

[0020] In this embodiment, existing sheet metal cleaning technologies often face problems such as unclear mechanical structure actuation logic and isolated parameter adjustments, resulting in poor adaptability to different sheet metal specifications. This method establishes the process sequence of wet and dry treatment through the setting of physical layout. In step S2, to address the issue of varying sheet metal widths, a width adjustment module 120 is used to adapt the conveyor channel, preventing the sheet metal from tilting during high-speed conveying. To address the phenomenon that the cleaning nozzle is prone to lateral swaying with fluid fluctuations, a vertical guide mechanism 230 is introduced, specifically a precision spline shaft manufactured by THK or an air-bearing guide sleeve manufactured by SMC, to provide rigid constraints, eliminate horizontal degrees of freedom, and ensure that the nozzle can only float vertically in response to changes in fluid pressure.

[0021] To ensure effective coupling of acoustic energy and fluid energy without interference, the acoustic-fluid coupling nozzle 220 employs a coaxial waveguide structure. Specifically, the cleaning fluid flow channel is designed as an annular cavity surrounding a piezoelectric transducer array 222 located at the center. When the fluid is ejected at high speed from the annular narrow slit, the ultrasonic waves generated by the piezoelectric transducers propagate axially along the liquid column formed by the fluid, serving as the acoustic waveguide. The dimensions of this structure must meet the acoustic cutoff frequency condition, i.e., the width of the annular flow channel. It should be less than half the wavelength of ultrasound in fluid. This is to suppress lateral parasitic modes and ensure that acoustic energy is concentrated within the Bernoulli adsorption region.

[0022] In step S3, the cleaning fluid is sprayed out at high speed using the principle of fluid dynamics to form a negative pressure field, which makes the nozzle passively suspended. It can maintain the micron-level gap without the need for external motor drive. This gap serves as an ideal waveguide for sound wave transmission. With the main controller 430, such as the frequency lock of the Siemens S7-1500 series PLC, the efficient transmission of sound energy is guaranteed. Step S4 solves the problem of deep hole drying. First, the surface tension of water is broken by sound waves, and then airflow is used for stripping. The drying efficiency is improved through the synergy of physical fields.

[0023] Step S2 also includes: The liquid supply line is connected to the acoustic-fluid coupling nozzle 220 via a flexible bellows 210. The axial stiffness of the flexible bellows 210 satisfies the mechanical equilibrium condition: within the maximum extension stroke, the sum of the elastic restoring force of the flexible bellows 210 and the frictional resistance of the vertical guide mechanism 230 is less than the minimum negative pressure adsorption force generated by the cleaning fluid under the Bernoulli effect.

[0024] In this embodiment, the flexible corrugated pipe 210 serves as a fluid delivery channel, and its physical properties directly affect the stability of the suspension. If the corrugated pipe is too stiff, its elastic restoring force will counteract the suction force generated by the fluid, causing the nozzle to be unable to descend to the working height. If it is too soft, it may undergo excessive deformation under the impact of high-pressure fluid. Therefore, setting clear mechanical balance conditions is crucial. When the cleaning fluid flows through the bottom of the nozzle, it generates a downward negative pressure suction force according to Bernoulli's principle. This force must overcome the gravity of the nozzle assembly, the frictional resistance generated by the vertical guide mechanism 230 (such as the low-friction linear bearing), and the elastic restoring force generated when the flexible corrugated pipe 210 is stretched or compressed. By selecting specific materials, such as 316L stainless steel or Teflon and corrugated pipes with sufficient wall thickness, and controlling the sum of the above resistances below the minimum negative pressure suction force threshold, the specific mechanical balance calculation logic is as follows: Determine the maximum suspension gap allowed by the cleaning process. The minimum negative pressure adsorption force generated by the fluid in this gap was calculated according to Bernoulli's equation. .

[0025] At this point, the mechanical equilibrium condition is satisfied. Where gravity is taken as positive when the nozzle sprays downwards and as negative when spraying upwards, in the formula, The axial stiffness coefficient of the flexible bellows 210 is... This represents the maximum deformation of the nozzle as it descends from its initial position to its working position. The dynamic friction force of the vertical guide mechanism 230 The force is the weight of the nozzle assembly; if the nozzle is installed upside down, the force is the subtraction of gravity. Technicians should select the bellows according to this inequality to ensure its rigidity. Its small size allows the nozzle to be drawn to the working height the instant the fluid is activated. This ensures that even with fluctuations in fluid pressure or slight warping of the substrate, the nozzle can overcome mechanical resistance using the fluid's negative pressure effect, maintaining a stable suspension gap and thus avoiding cleaning dead zones or nozzle collisions caused by mechanical interference.

[0026] In step S3, the frequency adjustment logic of the main controller 430 includes: The dynamic impedance signal of the piezoelectric transducer array 222 is monitored in real time by the impedance analyzer 410. The extreme value search is performed based on the zero crossing point of the impedance phase angle. When the acoustic load fluctuation caused by the change of the suspension gap is detected, the output frequency is automatically adjusted to the new resonant frequency point of the whole system.

[0027] In this embodiment, minute undulations on the surface of the plate cause changes in the thickness of the liquid film within the suspension gap, thereby altering the acoustic radiation impedance of the piezoelectric transducer array 222. If the driving frequency remains constant, the electroacoustic conversion efficiency of the system will decrease significantly. An impedance analyzer 410, such as a Keysight E4990A, is connected in series in the circuit to collect the phase difference between voltage and current in real time. When the phase difference deviates from zero, it indicates that the system has left the resonant state. The main controller 430, such as a Beckhoff CX2000 series industrial computer, internally runs an extreme value search algorithm, targeting the zero-crossing phase angle, and sends frequency adjustment commands to the frequency converter driver. This process does not require complex acoustic field modeling but rather relies on feedback of electrical parameters to quickly track the new resonant point of the system. The specific calculation logic is as follows: Step 1: Real-time acquisition of the current signal across the transducer using an impedance analyzer (410). and voltage signal And extract the phase angle Step 2: Calculate the rate of change of phase angle with frequency. Step 3: If The main controller (430) performs an extreme value search based on the current phase sign. Decrease frequency when Increase the frequency as needed until Entering the preset zero-point dead zone, such as This locks the system's resonant point; This dynamic adjustment ensures that the piezoelectric transducer always operates at its highest efficiency regardless of changes in the liquid film thickness, guaranteeing the strength stability of the ultrasonic cavitation field within the tiny gaps, thereby maintaining a consistent cleaning effect.

[0028] The S3 step also includes flow resistance thermal balance protection logic: When the impedance analyzer 410 detects that the rising slope of the real part of the impedance exceeds the preset threshold for sudden change in current resistance, it determines that the gap is compressed and there is a risk of overheating. The main controller 430 immediately performs exponential reverse decay on the drive voltage. After the rate of change of impedance returns to normal, the control voltage rises back on a linear ramp.

[0029] The attenuation coefficient of exponential reverse decay can be preset according to different board materials to match different heat sensitivity. In this embodiment, when the plate undergoes severe warping, causing the suspension gap to be extremely compressed, the fluid flow rate decreases sharply, and the ability to remove heat decreases proportionally to the cube of the gap height. If high-power ultrasonic emission continues at this time, the accumulated heat will quickly damage the transducer or burn the plate surface. The system uses an impedance analyzer 410 to monitor the rate of change of the real part of the impedance. The sharp rise in the real part of the impedance usually corresponds to the sudden change in acoustic radiation load and the increase in fluid damping.

[0030] This flow resistance abrupt change threshold The setting logic is based on the rate of change of the real part of the impedance over time. During the equipment commissioning phase, the suspension gap is gradually compressed manually until a critical overheating state is reached, for example, when the flow rate drops to 50% of the normal value. The real part of the impedance at this point is recorded. Maximum value of the first derivative In actual control, the safety threshold is set as follows: in, For safety, the recommended value range is [value range missing]. This ensures that voltage decay is triggered within milliseconds before overheating occurs.

[0031] Flow resistance change threshold It represents the logical critical point characterizing the balance between the heat dissipation capacity of the fluid within the cleaning gap and the acoustic load damping. Its physical significance lies in capturing the abrupt change in fluid damping caused by gap compression, at which point the real part of the resistive reactance... The rising slope reflects the trend of the transducer's work shifting from driving fluid to self-heating, and is a priori indicator for preventing thermal damage. Once the rising slope exceeds the safety threshold, the main controller 430 determines it as an early sign of overheating and immediately triggers the protection mechanism, rapidly reducing the drive voltage according to the exponential function curve to cut off the heat source input as quickly as possible. As the gap recovers or the blockage is released, the rate of change of impedance tends to stabilize, and the controller then controls the voltage to slowly rise again according to a linear ramp. This asymmetric voltage regulation logic can provide millisecond-level response protection hardware in times of crisis, and can also avoid sudden power surges during the recovery process, thus extending the service life of the equipment.

[0032] In step S4, the timing control of the Kornda effect air knife 320 includes: The main controller 430 acquires the real-time linear speed of the conveyor roller 110, calculates the time difference based on the physical distance between the focused air ultrasonic generator 310 and the Coanda effect air knife 320, and controls the Coanda effect air knife 320 to release airflow during the surface tension failure window of the water film.

[0033] In this embodiment, airflow alone is insufficient to remove moisture from deep pores. While ultrasonic desorption can loosen the moisture, it will re-adhere under surface tension if not removed promptly. When the focused air ultrasonic generator 310 is operating, the high-intensity sound waves cause the water film to oscillate at the interface, reducing its adhesion to the pore wall. This low-adhesion state lasts only a very short time. The main controller 430 obtains the precise plate movement speed by reading the pulse signal from the encoder of the drive motor of the conveyor roller 110, such as a Yaskawa servo motor. Given the fixed distance between the generator and the Coanda effect air knife 320 on the frame, the controller calculates the time delay required for the plate to move from the point of impact of the sound wave to the point of impact of the air knife. Based on this delay, the controller triggers the solenoid valve of the air supply unit 330 (e.g., SMCVQ series) to ensure that the high-speed airflow arrives precisely when the water film is in a loose, dewetting state, removing moisture using mechanical peeling force. To ensure effective airflow peeling, the physical installation distance L between the Coanda effect air knife 320 and the focused air ultrasonic generator 310 must satisfy the relaxation time constraint of the water film in the dewetting state. The calculation logic is as follows: Where v is the real-time linear speed of the conveyor roller 110. The characteristic time for the water film to recover its adhesion under surface tension after the ultrasonic waves have ceased to act, is typically a constant in the millisecond range. The main controller 430 calculates the maximum allowable spacing or adjusts the trigger delay of the air knife based on the currently set transmission speed v. ,make sure This allows the peeling to be completed while the water film is still in a loose and unstable state.

[0034] This temporal coordination based on speed and distance achieves spatiotemporal alignment of the sound field and the flow field, significantly improving dryness. Example

[0035] Please see Figure 1-3 A continuous cleaning device for sheet metal with adjustable spraying and drying units, comprising: Main framework 10; The main support and conveying assembly 100 is mounted on the main frame 10 and is used to convey the sheet metal. Bernoulli self-suspended cleaning assembly 200 is disposed in the wet treatment area of ​​the main frame 10, including an acoustic-fluid coupling nozzle 220 capable of generating a Bernoulli negative pressure field and an ultrasonic cavitation field. The acoustic desorption drying component 300 is located in the dry treatment area of ​​the main frame 10, downstream of the Bernoulli self-suspension cleaning component 200. The control and feedback unit 400 is used to monitor cleaning parameters and coordinate the operation of various components.

[0036] In this embodiment, a device integrates mechanical transfer, fluid cleaning, and acoustic drying functions. The main frame 10 is welded from corrosion-resistant stainless steel square tubing, providing a stable physical reference. The main support and transfer assembly 100 is responsible for the continuous feeding of the sheet material. The Bernoulli self-suspended cleaning assembly 200 in the wet treatment zone utilizes the physical properties of fluids to solve the problem of non-contact cleaning, while the acoustic desorption drying assembly 300 utilizes acoustic energy to solve the problem of microporous drying. The two are connected in series along the process path and do not interfere with each other. The control and feedback unit 400, as the information processing core, connects various actuators and sensors to achieve closed-loop parameter adjustment. Specifically, the control and feedback unit 400 receives the load electrical signal from the impedance analyzer 410 through the main controller 430 and compensates for frequency fluctuations in the transducer array 222 in real time, thereby establishing a mapping relationship between electrical signal monitoring and fluid suspension height at the physical level. This device, through its modular layout, solves the problem of fragmented parameters in different process stages in traditional equipment, providing a highly integrated cleaning and drying solution.

[0037] Bernoulli self-suspension cleaning assembly 200 also includes: The vertical guide mechanism 230 has its stator end fixed to the main frame 10 and its mover end connected to the acoustic-flow coupling nozzle 220, which is used to constrain the movement trajectory of the nozzle. The flexible corrugated pipe 210 is sleeved outside the vertical guide mechanism 230 or arranged in parallel, serving as a sealed channel for fluid and cable. Its upper end is connected to a rigid pipe, and its lower end is connected to an acoustic-fluid coupling nozzle 220.

[0038] In this embodiment, to achieve adaptive following of the nozzle to the warping of the board material without lateral deviation, the vertical guide mechanism 230 employs precision guide elements, such as splined shafts or air-bearing guide sleeves. Its stator is securely mounted on the frame beam, and its mover is rigidly connected to the acoustic-fluid coupling nozzle 220. This structure physically locks the displacement of the X and Y axes and the rotation about the Z axis, allowing only the Z-axis degree of freedom. The flexible bellows 210, made of corrosion-resistant materials such as PTFE, is responsible for transmitting the cleaning fluid and encasing the internal electrical cables, preventing liquid leakage and short circuits. The bellows can be installed either around the outside of the guide mechanism to save space or in parallel. This assembly, through the combination of rigid guidance and flexible connection, ensures that the nozzle can sensitively rise and fall vertically with changes in board material height under Bernoulli negative pressure, establishing a stable cleaning geometry.

[0039] The main support and transmission assembly 100 includes: Conveyor rollers 110 are rotatably mounted on both sides of the main frame 10; The width adjustment module 120 is installed above the main frame 10 and includes a bidirectional trapezoidal lead screw and a backlash-eliminating nut. It is used to drive the limit baffle to move synchronously in opposite directions along the linear guide rail to adjust the width of the transmission channel.

[0040] In this embodiment, the conveyor roller 110 is made of a corrosion-resistant polymer material, such as PEEK, to avoid scratching the surface of the sheet material. The roller is mounted on the frame via a bearing seat. To accommodate sheets of different widths, the width adjustment module 120 is positioned above the conveyor surface. Its core drive mechanism uses a bidirectional trapezoidal lead screw with a backlash-free nut. This mechanical structure can convert a single rotational motion into a constant-speed opposing linear motion of two sliders. When the operator rotates the handwheel or drives the lead screw via a motor, the limit baffles on both sides move closer or further apart along the linear guide rail. The linear guide rail not only provides guidance but also bears lateral force, preventing the baffles from rotating with the lead screw. This design ensures that the center line of the conveyor channel always coincides with the center line of the equipment, guaranteeing the alignment of the sheet material transmission.

[0041] The acoustic desorption drying assembly 300 includes: The focusing air ultrasonic generator 310 includes a parabolic reflector and a Hartmann whistle located at the focal point, with the emission port tilted toward the surface of the plate. The Coanda effect air knife 320 is located immediately downstream of the focusing air ultrasonic generator 310, and its air outlet is an asymmetrical curved surface.

[0042] In this embodiment, the focused air ultrasonic generator 310 utilizes the Hartmann whistle principle, that is, high-frequency sound waves are generated by high-speed airflow impacting the resonant cavity. It requires no electric drive and has a durable structure. The parabolic reflector focuses the divergent sound wave energy onto a line on the surface of the plate, significantly increasing the sound intensity per unit area, sufficient to overcome the capillary force of the liquid within the micropores. Logically, the acoustic radiation pressure at the focal point... It must be greater than the capillary pressure of the liquid inside the micropore. That is, satisfying ,in The surface tension coefficient of the liquid. Contact angle, Given the micropore radius of the plate material, the design of the Hartmann whistle must ensure that the sound pressure level generated at the focal point exceeds this critical value. Typically, it needs to reach above 150 dB, utilizing the nonlinear effect of high-intensity sound waves at the gas-liquid interface to induce cavitation or interface waves, thereby disrupting capillary equilibrium.

[0043] The Kornda effect air knife 320 is installed immediately downstream. Its outlet design utilizes the fluid adhesion effect to guide the airflow to deflect along an asymmetric curved surface, forming a high-speed, wall-attached laminar air curtain. This air curtain has extremely strong shearing force, which, in conjunction with the interfacial instability caused by the preceding acoustic wave, can efficiently strip away moisture. The close physical proximity of the two is the hardware basis for realizing the oscillation-stripping synergistic effect.

[0044] The control and feedback unit 400 includes an impedance analyzer 410 connected in series in the drive circuit and a main controller 430 connected to the air supply unit 330.

[0045] In this embodiment, to achieve intelligent control of the cleaning and drying process, the control and feedback unit 400 constructs a data interaction network. An impedance analyzer 410 is connected in series to the power supply circuit of the piezoelectric transducer, acting as a sensory nerve, analyzing the voltage and current relationship in the circuit in real time, and outputting impedance spectrum data. The air supply unit 330 includes an air compressor, an oil-water separator, and a pressure stabilizing tank, providing a power source for the main equipment. The main controller 430 serves as the logic center; physically, it can be an industrial PLC or industrial computer. Its input terminal receives impedance data and transmits speed signals, and its output terminal connects to a frequency converter and a pneumatic solenoid valve. Through this electrical connection, the controller can adjust energy output, such as ultrasonic frequency and airflow interruption, based on real-time physical feedback, such as impedance changes and speed changes, thereby achieving precise intervention in the cleaning and drying process at the hardware level.

[0046] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A continuous cleaning method for sheet metal with adjustable spraying and drying units, characterized in that, include: S1. Set up a main frame (10), a main support and conveying assembly (100), a Bernoulli self-suspended cleaning assembly (200), and an acoustic desorption drying assembly (300), wherein the Bernoulli self-suspended cleaning assembly (200) and the acoustic desorption drying assembly (300) are sequentially arranged on the main frame (10) along the plate conveying direction. The Bernoulli self-suspended cleaning assembly (200) includes an acoustic-flow coupling nozzle (220), and the acoustic desorption drying assembly (300) includes a focused air ultrasonic generator (310) and a Coanda effect air knife (320). S2. Adjust the width of the transmission channel of the main support and transmission assembly (100) by means of the width adjustment module (120), and set a vertical guide mechanism (230) above the acoustic-flow coupling nozzle (220). The vertical guide mechanism (230) restricts the displacement and rotation of the acoustic-flow coupling nozzle (220) in the horizontal plane, and only retains the vertical direction of movement freedom. S3. Start the transmission and introduce the cleaning fluid into the acoustic-flow coupling nozzle (220). Establish a Bernoulli negative pressure suspension gap between the acoustic-flow coupling nozzle (220) and the plate. At the same time, drive the piezoelectric transducer array (222) inside the acoustic-flow coupling nozzle (220) to generate an ultrasonic cavitation field. The main controller (430) finely adjusts the driving frequency in real time according to the impedance feedback to lock the resonance point. S4. The board enters the drying zone. The high-intensity air ultrasonic waves generated by the focused air ultrasonic generator (310) cause the water film on the surface and in the pores of the board to oscillate and dewetting. Then, the high-speed laminar airflow generated by the Coanda effect air knife (320) peels off the unstable water droplets.

2. The continuous cleaning method for sheet metal with adjustable spraying and drying units according to claim 1, characterized in that, Step S2 also includes: The liquid supply line is connected to the acoustic-fluid coupling nozzle (220) via a flexible corrugated pipe (210). The axial stiffness of the flexible corrugated pipe (210) satisfies the mechanical equilibrium condition: within the maximum extension stroke, the sum of the elastic restoring force of the flexible corrugated pipe (210) and the frictional resistance of the vertical guide mechanism (230) is less than the minimum negative pressure adsorption force generated by the cleaning fluid under the Bernoulli effect.

3. The continuous cleaning method for sheet metal with adjustable spraying and drying units according to claim 1, characterized in that, In step S3, the frequency adjustment logic of the main controller (430) includes: The dynamic impedance signal of the piezoelectric transducer array (222) is monitored in real time by an impedance analyzer (410). The extreme value search is performed based on the zero crossing point of the impedance phase angle. When the acoustic load fluctuation caused by the change of the suspension gap is detected, the output frequency is automatically adjusted to the new resonant frequency point of the whole system.

4. The continuous cleaning method for sheet metal with adjustable spraying and drying units according to claim 3, characterized in that, Step S3 also includes flow resistance thermal balance protection logic: When the impedance analyzer (410) detects that the rising slope of the real part of the impedance exceeds the preset threshold for sudden change in flow resistance, it determines that the gap is compressed and there is a risk of overheating. The main controller (430) immediately performs exponential reverse decay on the driving voltage. After the rate of change of impedance returns to normal, the control voltage rises back on a linear ramp.

5. The continuous cleaning method for sheet metal with adjustable spraying and drying units according to claim 1, characterized in that, In step S4, the timing control of the operation of the Coanda effect air knife (320) includes: The main controller (430) acquires the real-time linear speed of the conveyor roller (110), calculates the time difference based on the physical distance between the focused air ultrasonic generator (310) and the Coanda effect air knife (320), and controls the Coanda effect air knife (320) to release airflow during the surface tension failure window of the water film.

6. A continuous cleaning device for sheet metal with adjustable spraying and drying units, applied to the continuous cleaning method for sheet metal with adjustable spraying and drying units as described in any one of claims 1 to 5, characterized in that, include: Main framework (10); The main support and conveying assembly (100) is disposed on the main frame (10) and is used to convey the plate material; The Bernoulli self-suspended cleaning assembly (200) is disposed in the wet treatment area of ​​the main frame (10) and includes an acoustic-fluid coupling nozzle (220) capable of generating a Bernoulli negative pressure field and an ultrasonic cavitation field. The acoustic desorption drying assembly (300) is disposed in the drying treatment area of ​​the main frame (10) and is located downstream of the Bernoulli self-suspension cleaning assembly (200); The control and feedback unit (400) is used to monitor cleaning parameters and coordinate the operation of each component.

7. The continuous cleaning device for sheet metal with adjustable spraying and drying units according to claim 6, characterized in that, The Bernoulli self-suspended cleaning assembly (200) also includes: The vertical guide mechanism (230) has its stator end fixed to the main frame (10) and its mover end connected to the acoustic-flow coupling nozzle (220) to constrain the nozzle's motion trajectory. A flexible corrugated pipe (210) is sleeved outside the vertical guide mechanism (230) or arranged in parallel to it, serving as a sealed channel for fluid and cable. Its upper end is connected to a rigid pipe, and its lower end is connected to the acoustic-fluid coupling nozzle (220).

8. The continuous cleaning device for sheet metal with adjustable spraying and drying units according to claim 6, characterized in that, The main support and transmission assembly (100) includes: Conveyor rollers (110) are rotatably mounted on both sides of the main frame (10); Width adjustment module (120) is installed above the main frame (10) and includes a two-way trapezoidal lead screw and a backlash-eliminating nut, used to drive the limit baffle to move synchronously in opposite directions along the linear guide rail to adjust the width of the transmission channel.

9. The continuous cleaning device for sheet metal with adjustable spraying and drying units according to claim 6, characterized in that, The acoustic desorption drying assembly (300) includes: A focused air ultrasonic generator (310) includes a parabolic reflector and a Hartmann whistle located at the focal point, with the emission port tilted toward the surface of the plate. The Coanda effect air knife (320) is located immediately downstream of the focused air ultrasonic generator (310), and its air outlet is an asymmetrical curved surface.

10. The continuous cleaning device for sheet metal with adjustable spraying and drying units according to claim 6, characterized in that, The control and feedback unit (400) includes an impedance analyzer (410) connected in series in the drive circuit and a main controller (430) connected to the gas supply unit (330).

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