Zheng surface spraying equipment

Abstract

The invention relates to the technical field of spraying equipment, and discloses Chinese zither surface spraying equipment which comprises an integrated collaborative spraying system which comprises a closed spraying cabin, a closed spraying cavity is formed in the closed spraying cabin, a cross shaft positioner is arranged at the top of the closed spraying cabin, and the cross shaft positioner drives a rotary spraying head on the side wall through a lifter to achieve three-dimensional dynamic spraying; according to the device, traceless, high-rigidity and full-coverage positioning of the whole backboard is achieved through a differential adsorption strategy designed according to the material characteristics and the structural characteristics of the zither backboard, the backboard does not need to be sprayed, the adsorption area does not shield any to-be-coated surface at all, and the coating effect is good. The rotary spraying head can complete continuous covering spraying of the head, the tail, the two side edges and the panel edge at a time, the procedures of repeated face turning, repeated clamping and supplementary spraying are thoroughly avoided, the single-piece operation period is greatly shortened, and the overall spraying efficiency and consistency are improved.

Description

Technical Field

[0001] This invention relates to the field of spraying equipment technology, specifically to a spraying equipment for the surface of a guzheng (Chinese zither). Background Technology

[0002] The guzheng is a representative traditional plucked string instrument in my country with a long history and exquisite craftsmanship. Its shape is a rectangular soundbox structure, composed of a soundboard, backboard, sides, head, tail, and sound beams. The backboard is usually made of lightweight, breathable paulownia or cedar wood, with a smooth surface and no decorative requirements. The sides, head, tail, and edges of the soundboard, however, require multiple layers of lacquer or synthetic lacquer to achieve multiple functions such as moisture resistance, wear resistance, gloss enhancement, and cultural representation. Lacquer work, as one of the core processes in guzheng making, directly affects the instrument's acoustic quality, aesthetic appearance, and lifespan.

[0003] Traditional guzheng painting has long relied on manual operation or general-purpose automatic painting equipment, commonly employing a side-wall clamping positioning method: mechanical clamps apply clamping force from the outer edges of both sides of the guzheng to fix the workpiece to a rotating bracket or conveyor line. While this method achieves basic clamping, it has significant process defects. First, the clamps inevitably obscure certain areas of the side panels, preventing them from being painted in one go. After completing one side, the clamps must be released, the workpiece flipped, and re-clamped before painting the other side, increasing clamping time and human error, and increasing the risk of scratches on the paint film or slight deformation of the instrument during flipping. Second, the side panels themselves are critical coating surfaces; clamping contact points can leave indentations, oil stains, or paint buildup, requiring subsequent manual adjustments and affecting the uniformity and gloss of the paint finish. Third, the guzheng side panels have an arc-shaped edge structure, making it difficult for the clamps to apply force evenly along the entire arc length, often resulting in localized slippage or loosening. This leads to spray trajectory deviation and insufficient edge coverage, especially in areas with greater curvature at the head of the instrument, easily causing missed areas or runs.

[0004] Furthermore, existing spraying equipment often simply combines clamping and spraying functions, lacking a design adapted to the characteristics of irregularly shaped, thin-walled wooden workpieces like the guzheng. Their clamping systems suffer from insufficient rigidity, non-adjustable pressure, and a lack of feedback, failing to cope with the size differences and material flexibility variations of different guzheng sizes (such as S-shaped, U-shaped, and portable models). The air and liquid circuits are also not closed-loop, resulting in untreated paint mist being discharged into the workshop environment, and waste paint being directly discharged or simply settled before being transported off-site, failing to meet environmental protection requirements and wasting resources. Therefore, there is an urgent need for a specialized spraying device that can take into account the structural characteristics of intangible cultural heritage workpieces, respect the logic of traditional lacquer art techniques, and integrate modern intelligent control and green recycling concepts to overcome the systemic bottlenecks in current automated guzheng spraying in terms of positioning accuracy, work efficiency, paint surface quality, and environmental friendliness. Summary of the Invention

[0005] The purpose of this invention is to provide a surface coating device for a guzheng (Chinese zither) to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a guzheng surface spraying device, comprising:

[0007] An integrated collaborative spraying system includes:

[0008] The sealed spraying chamber forms a sealed spraying cavity inside, and a cross-axis positioner is provided on the top. The cross-axis positioner drives the rotating nozzle on the side wall through a lifter to achieve three-dimensional dynamic spraying.

[0009] An adaptive adsorption and flipping mechanism is located in the lower part of a sealed spraying chamber. It includes a support base that can be flipped and symmetrically arranged micro-adsorption components. The surface of the support base is provided with a flexible support array. The pressure feedback is used to fit the curved surface of the guzheng backboard in real time. The micro-adsorption components are controlled by vacuum gradient to adapt to the edge shape of the guzheng.

[0010] The recycling subsystem, integrated into the inner wall and bottom of the sealed spray booth, includes:

[0011] The paint mist filtration module uses a multi-layer composite filtration structure to classify and purify the paint mist generated during spraying.

[0012] The waste liquid regeneration module collects dripping waste liquid and treats it through centrifugation, condensation, and ultraviolet catalysis to form recycled coatings.

[0013] A condensing centrifugal coupler connects the paint mist filtration module and the waste liquid regeneration module, enabling simultaneous regeneration of gaseous residues and liquid waste.

[0014] Among them, the electrostatic air curtain coupling spraying path of the rotating nozzle, the dynamic attitude adjustment of the adaptive adsorption and flipping mechanism, and the waste recycling of the recycling subsystem are coordinated and controlled by the central controller to realize the full-coverage spraying of the guzheng surface and the closed-loop utilization of resources.

[0015] According to the above technical solution, the rotating nozzle includes:

[0016] A rotating base is coaxially fixed to the output end of the elevator;

[0017] Multiple central main nozzles are evenly distributed along the circumference of the rotating base. Each central main nozzle has a built-in conductive electrode in its nozzle. The conductive electrode is connected to a high-voltage electrostatic generator integrated inside the rotating base through an insulated through-wall wire.

[0018] The dual-ring edge air curtain generator includes:

[0019] The inner air curtain ring is composed of micro air holes evenly distributed around the outer edge of the rotating base. Each micro air hole is connected to an external air supply device through a second delivery pipe, and the spray direction is perpendicular to the normal of the guzheng surface.

[0020] The outer electrostatic ring is composed of an array of electrostatic emission needles evenly distributed around the outer edge of the inner air curtain ring. The discharge end of each electrostatic emission needle array faces the side surface of the guzheng and forms an acute angle with the spray direction of the inner air curtain ring. The electrostatic emission needle array is connected to an adjustable polarity high voltage power supply.

[0021] The air curtain generated by the dual-ring edge air curtain generator, together with the electrostatic field, acts on the side border areas of the guzheng, forming the core execution unit of the electrostatic air curtain coupled spraying path.

[0022] According to the above technical solution, the adaptive adsorption and flipping mechanism includes:

[0023] Support base;

[0024] The central support includes a central column fixed to the center of the upper surface of the support base, a transverse fixing beam fixed to the top of the central column, and a flexible support array fixed to both ends of the transverse fixing beam.

[0025] The flexible support array consists of multiple independent floating units, each of which includes:

[0026] Bottom support plate;

[0027] A miniature servo piezoelectric ceramic actuator fixed to the bottom support plate;

[0028] A silicone carbon fiber composite elastic layer fixed to the driving end of the micro servo piezoelectric ceramic driver;

[0029] A pressure sensor is embedded at the top of the silicone carbon fiber composite elastic layer;

[0030] The input terminal of the central controller is connected to all the pressure sensors, and the output terminal is connected to all the micro servo piezoelectric ceramic actuators. It is used to independently adjust the displacement of each micro servo piezoelectric ceramic actuator according to the real-time feedback value of each pressure sensor, so that all independent floating units can work together to fit the curved surface of the guzheng backboard and support the dynamic posture adjustment.

[0031] According to the above technical solution, the adaptive adsorption and flipping mechanism further includes an arc-shaped inverted component, which includes:

[0032] Side wing fixing rings are arranged in a mirror-symmetrical manner on both sides of the supporting base;

[0033] The sliding block is movably installed in the arc-shaped guide rail groove on the inner side wall of the sealed spraying chamber and is fixedly connected to the end of the side wing fixing ring.

[0034] An arc-shaped guide rod is fixedly installed at one end on the side wall of the sliding block, and slidably fitted at the other end on the inner wall of the arc-shaped guide groove;

[0035] A drive motor is embedded in the side wall of the arc-shaped guide rail groove, and its output shaft is fixedly equipped with a drive gear.

[0036] A rack is fixed to the side wall of the arc-shaped guide rod along its length and meshes with the drive gear;

[0037] The drive motor drives the arc-shaped guide rod to move the sliding block along the arc-shaped guide groove through the meshing of the drive gear and rack, thereby driving the supporting base to rotate 180 degrees around the horizontal axis to achieve the dynamic posture adjustment.

[0038] According to the above technical solution, the adaptive adsorption and flipping mechanism further includes a micro-adsorption component, which includes:

[0039] The movable slider is movably installed in the movable groove at the upper end of the supporting base;

[0040] A servo motor is fixedly installed on one side of the movable slide, and its output shaft is fixedly installed with a threaded rod, which is threadedly connected to the movable slider.

[0041] The servo motor drives the threaded rod to rotate, which in turn causes the movable slider to reciprocate along the movable groove, thereby achieving precise positioning of the micro-adsorption component at the edge of the guzheng.

[0042] According to the above technical solution, the micro-adsorption component further includes a micro-adsorption fixing column, which comprises:

[0043] An electric telescopic cylinder, the cylinder body of which is movably mounted on the top of the movable slider via a detachable seat, and a micro-adsorption head is fixedly mounted on its telescopic end;

[0044] The micro-adsorption head includes a central adsorption disk and an edge adsorption disk surrounding the central adsorption disk. The central adsorption disk is connected to a first air pump through a first air supply pipe, and the edge adsorption disk is connected to a second air pump through a second air supply pipe.

[0045] Vacuum sensors are respectively installed inside the central adsorption disk and the edge adsorption disk;

[0046] The central controller independently adjusts the pumping rates of the first and second air pumps based on the feedback signal from the vacuum sensor, thereby forming the vacuum gradient control and enabling the micro-adsorption fixing column to adapt to different thicknesses and curvatures of the guzheng's edge.

[0047] According to the above technical solution, the paint mist filtration module includes:

[0048] The circulating filter box has a first composite filter layer inside;

[0049] A circulating filter tube is connected at one end to the circulating filter box and at the other end to the sealed spraying chamber.

[0050] The first composite filter layer includes:

[0051] The first filter layer is made of polyester fiber non-woven fabric;

[0052] The second filter layer is made of activated carbon adsorption material;

[0053] The third filter layer is made of high-efficiency air filtration material;

[0054] The fourth filter layer is made of photocatalytic oxidation material;

[0055] Redundant circuit pipe, on which a normally closed control valve is installed;

[0056] The paint mist filtration module performs graded purification of the paint mist generated during the spraying process, providing a clean air source for the closed-loop utilization of resources.

[0057] According to the above technical solution, the waste liquid regeneration module includes:

[0058] An outflow pipe is installed through the bottom of the sealed spraying chamber. An inclined guide surface is provided at the bottom of the sealed spraying chamber, and the lower end of the inclined guide surface is connected to the outflow pipe.

[0059] A purification and reuse box is located at the bottom of the outflow pipe. It is installed at the four corners of the sealed spraying chamber by fixing support bolts. A connection interface is provided at the top, and the outflow pipe is sealed and inserted into the connection interface.

[0060] A detachable insert plate is horizontally installed on the upper part of the purification and reuse box by magnetic attraction, and a second composite filter layer is integrated inside the detachable insert plate;

[0061] The second composite filter layer includes:

[0062] The primary filter layer is made of stainless steel mesh.

[0063] The middle filtration layer is made of modified diatomaceous earth filter media;

[0064] The high-filtration layer is made of ion exchange resin;

[0065] The waste liquid regeneration module transforms dripping waste liquid into reusable components, forming the liquid-phase basis for the closed-loop utilization of resources.

[0066] According to the above technical solution, the condensing centrifugal coupler includes:

[0067] The condenser is vertically divided into a condensation chamber, a centrifuge chamber, and an ultraviolet catalytic chamber.

[0068] The third delivery pipe has its upstream end connected to the air outlet of the paint mist filter module, and its downstream end spiraling down along the inner wall of the condensation chamber and extending into the centrifuge chamber.

[0069] The fourth conveying pipe has its upstream end connected to the outlet of the waste liquid regeneration module, and its downstream end extends vertically into the condensation chamber along the central axis and into the centrifuge chamber.

[0070] A condenser plate is disposed on the inner wall of the condensation chamber;

[0071] A high-speed centrifuge is installed inside the centrifuge chamber;

[0072] The ultraviolet catalytic chamber is equipped with an ultraviolet lamp assembly.

[0073] The return pipe has its upstream end connected to the bottom of the ultraviolet catalytic chamber and its downstream end connected to an external liquid supply device. The return pipe is equipped with a precision filter and a flow regulating valve.

[0074] The return gas pipe has its upstream end connected to the top of the ultraviolet catalytic chamber and its downstream end extended into the interior of the sealed spraying chamber, and an electric air valve is provided on the return gas pipe.

[0075] The condensing centrifugal coupler simultaneously regenerates gaseous residues and liquid waste, generating recycled coatings which are then transported to the rotary nozzle, completing the final stage of the closed-loop resource utilization.

[0076] According to the above technical solution, the central controller is a programmable logic controller. Its input terminal is connected to the pressure sensor, vacuum sensor and flow sensor on each delivery pipeline, and its output terminal is connected to the drive motor, servo motor, high voltage electrostatic generator, first air pump, second air pump, high speed centrifuge, ultraviolet lamp group, flow regulating valve and electric air valve respectively.

[0077] The central controller, according to a preset process program, synchronously coordinates the spraying trajectory of the rotating nozzle, the attitude adjustment of the adaptive adsorption and flipping mechanism, the airflow regulation of the paint mist filtration module, the liquid level control of the waste liquid regeneration module, and the regeneration parameters of the condenser centrifugal coupler, to achieve integrated and coordinated control of the full-coverage spraying of the guzheng surface and the closed-loop utilization of resources.

[0078] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0079] (1) This equipment adopts a full-area adaptive adsorption method for the back panel, which fundamentally eliminates the interference of traditional side wall clamping on the spraying operation. Through a differentiated adsorption strategy designed for the material characteristics and structural features of the guzheng back panel, it achieves traceless, high-rigidity, and full-coverage positioning of the entire back panel. Since the back panel itself does not need to be sprayed, the adsorption area does not block any surface to be coated, allowing the rotating nozzle to complete continuous coverage spraying of the head, tail, sides, and edge of the panel in one go, completely avoiding multiple flipping, repeated clamping, and touch-up spraying processes, greatly shortening the single-piece operation cycle, and improving the overall spraying efficiency and consistency.

[0080] (2) This equipment achieves a three-stage gradient purification and in-situ regeneration closed loop for gaseous pollutants. The paint mist-containing gas flow first passes through a multi-layer composite filtration structure in the circulating filter box, completing the interception of large particles, adsorption of organic vapors, capture of micron-sized particles, and photocatalytic oxidation; then it enters the condensing centrifugal coupler, where deep condensation is achieved under the synergistic effect of the condensing plate and the spiral conveying channel, and efficient gas-liquid separation is completed in the high-speed centrifugal structure, and molecular-level mineralization is carried out in the ultraviolet catalytic chamber. All the purified clean gas is returned to the spraying chamber, continuously maintaining the positive pressure and clean environment inside the chamber, eliminating paint mist overflow and cross-contamination from the source, and ensuring a stable and controllable spraying process.

[0081] (3) This equipment realizes the full-component directional recycling and quality-enhancing regeneration of liquid waste. After the sedimented waste is collected by the bottom inclined guide surface, it enters the purification and reuse tank. Impurities, colloids and ionic components that affect the stability of the coating are removed layer by layer through the multi-stage gradient filtration structure. The regenerated liquid is further transported to the condenser centrifugal coupler. Under the multiple effects of condensation, centrifugation and ultraviolet catalysis, thermo-mass enhancement and deep purification are completed, and finally high-quality regenerated coating that meets the requirements of the spraying process is obtained. It can be directly used for continuous atomization operation of rotary nozzles, which significantly reduces the consumption of new materials and the burden of waste liquid disposal.

[0082] (4) This equipment constructs two independent but highly coordinated regeneration and reuse paths: the gas phase and the liquid phase. The gas path and the liquid path are completely separated in terms of physical channels to avoid mutual interference; in terms of control logic, they are uniformly scheduled by the central controller, which dynamically matches the airflow purification rate and liquid regeneration flow rate according to the real-time spraying status to ensure that the supply rhythm of regenerated resources is strictly consistent with the spraying consumption rhythm, which not only prevents liquid accumulation or gas blockage in the system, but also avoids spraying interruption or quality fluctuation caused by insufficient material supply.

[0083] (5) This equipment has a fail-safe, redundant gas path automatic switching capability. When the condenser centrifugal coupler malfunctions, the system can close the main gas path valve and open the backup bypass valve within milliseconds, allowing the pre-filtered gas to bypass the condenser centrifugal coupler and be directly returned to the spraying chamber. This switching process does not require machine shutdown, does not interrupt spraying, and does not change the pressure state inside the chamber, ensuring that the equipment can still maintain basic spraying capabilities even in the event of partial functional failure, greatly improving the system's operational reliability and production line continuity.

[0084] (6) This equipment realizes the closed-loop utilization of gaseous and liquid phase resources during the spraying process. All escaping paint mist is collected and purified into clean carrier gas, which is then reused to maintain the spraying environment; all settled waste liquid is recovered and regenerated into qualified coatings, which are then reused to supply spraying materials. The entire process does not generate any waste paint, waste liquid, waste gas, or cleaning wastewater, truly achieving the goals of on-site resource regeneration, zero external discharge, and green manufacturing, which aligns with the sustainable development requirements of intelligent production of intangible cultural heritage musical instruments. Attached Figure Description

[0085] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0086] Figure 1 This is a first perspective view of the present invention;

[0087] Figure 2 This is a second perspective view of the present invention;

[0088] Figure 3 This is a third perspective view of the present invention;

[0089] Figure 4 This is a first partial three-dimensional schematic diagram of the present invention;

[0090] Figure 5 This is a second partial perspective view of the present invention;

[0091] Figure 6 This is a third partial perspective view of the present invention;

[0092] Figure 7This is a fourth partial perspective view of the present invention;

[0093] Figure 8 This is a fifth partial perspective view of the present invention;

[0094] Figure 9 This is a sixth partial perspective view of the present invention;

[0095] Figure 10 This is a third-dimensional schematic diagram of the seventh part of the present invention;

[0096] Figure 11 This is the eighth partial perspective view of the present invention;

[0097] Figure 12 This is the present invention. Figure 9 A magnified view of a portion of point A in the middle;

[0098] In the diagram: 100-Sealed spray booth, 101-Arc-shaped guide rail groove, 102-Inclined guide surface, 110-Cross-axis positioner, 120-Lifter, 130-Rotating nozzle, 131-Rotating base, 132-Central main nozzle, 141-Conductive electrode, 142-Insulated through-wall wire, 150-High-voltage electrostatic generator, 160-Double-ring edge air curtain generator, 161-Inner ring air curtain, 162-Micro vents, 163-Second delivery pipe, 164-Outer ring electrostatic ring, 165-Electrostatic emission needle array, 166-Adjustable polarity high-voltage power supply, 200-Adaptive adsorption and flipping mechanism, 210-Supporting base, 220-Micro Adsorption assembly, 221-moving slider, 222-servo motor, 223-threaded rod, 224-micro-adsorption fixing column, 2241-electric telescopic cylinder, 2242-detachable seat, 2243-micro-adsorption head, 2244-central adsorption plate, 2245-edge adsorption plate, 2246-first air supply pipe, 2247-first air pump, 2248-second air supply pipe, 2249-second air pump, 225-vacuum sensor, 230-flexible support array, 231-independent floating unit, 232-bottom support plate, 233-micro servo piezoelectric ceramic actuator, 234-silicone carbon fiber composite elastic layer, 235-pressure sensor 240-Central Support, 241-Central Column, 242-Transverse Fixed Beam, 250-Arc-Shaped Inverted Assembly, 251-Side Wing Fixing Ring, 252-Sliding Block, 253-Arc-Shaped Guide Rod, 254-Drive Motor, 255-Drive Gear, 256-Rack, 310-Paint Mist Filter Module, 311-Circulating Filter Box, 312-First Composite Filter Layer, 313-Circulating Filter Tube, 314-First Filter Layer, 315-Second Filter Layer, 316-Third Filter Layer, 317-Fourth Filter Layer, 318-Redundant Circuit Pipe, 319-Normally Closed Control Valve, 320-Waste Liquid Regeneration Module, 321-Outflow Pipe, 322-Clean 323-Recycling box, 324-Fixing support rod, 325-Removable insert plate, 326-Second composite filter layer, 327-Primary filter layer, 328-Medium filter layer, 329-High filter layer, 330-Condensing centrifugal coupler, 331-Condensing box, 332-Condensing chamber, 333-Centrifuge chamber, 334-UV catalytic chamber, 335-Third delivery pipe, 336-Fourth delivery pipe, 337-Condensing plate, 338-High-speed centrifuge, 339-UV lamp assembly, 340-Return pipe, 341-Precision filter, 342-Flow regulating valve, 343-Return gas pipe, 344-Electric air valve, 400-Central controller. Detailed Implementation

[0099] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0100] Please see Figure 1-12 The present invention provides a technical solution: a guzheng surface spraying device, comprising:

[0101] An integrated collaborative spraying system includes:

[0102] The sealed spraying chamber 100 forms a sealed spraying cavity inside, and a cross axis positioner 110 is provided on the top. The cross axis positioner 110 drives the rotating nozzle 130 on the side wall through the lifting device 120 to achieve three-dimensional dynamic spraying.

[0103] An adaptive adsorption and flipping mechanism 200 is located in the lower part of a sealed spraying chamber. It includes a support base 210 that can be flipped 180 degrees and symmetrically arranged micro-adsorption components 220. The surface of the support base 210 is provided with a flexible support array 230, which fits the curved surface of the guzheng backboard in real time through pressure feedback. The micro-adsorption components 220 are adapted to the edge shape of the guzheng through vacuum gradient control.

[0104] The recycling subsystem, integrated into the inner wall and bottom of the sealed spray booth 100, includes:

[0105] The paint mist filtration module 310 uses a multi-layer composite filtration structure to classify and purify the paint mist generated during spraying.

[0106] Waste liquid regeneration module 320 collects dripping waste liquid and treats it by centrifugation, condensation, and ultraviolet catalysis to form recycled coating;

[0107] The condensing centrifugal coupler 330 connects the paint mist filtration module 310 and the waste liquid regeneration module 320 to simultaneously regenerate gaseous residues and liquid waste.

[0108] Among them, the electrostatic air curtain coupled spraying path of the rotating nozzle 130, the dynamic attitude adjustment of the adaptive adsorption and flipping mechanism 200, and the waste recycling of the recycling subsystem are coordinated and controlled by the central controller 400 to realize the full-enclosed spraying of the guzheng surface and the closed-loop utilization of resources.

[0109] Specifically, the rotating nozzle 130 includes:

[0110] The rotating base 131 is coaxially fixed to the output end of the lifting device 120;

[0111] Multiple central main nozzles 132 are evenly distributed around the circumference of the rotating base 131. Each central main nozzle 132 has a built-in conductive electrode 141 in its nozzle. The conductive electrode 141 is connected to a high-voltage electrostatic generator 150 integrated inside the rotating base 131 through an insulated through-wall wire 142.

[0112] The dual-ring edge air curtain generator 160 includes:

[0113] The inner air curtain ring 161 is composed of micro air holes 162 evenly distributed around the outer edge of the rotating base 131. Each micro air hole 162 is connected to an external air supply device through a second delivery pipe 163, and the spray direction is perpendicular to the normal of the guzheng surface.

[0114] The outer electrostatic ring 164 is composed of an array of electrostatic emission needles 165 evenly distributed around the outer edge of the inner air curtain ring 161. The discharge end of each electrostatic emission needle array 165 faces the side surface of the guzheng and forms an acute angle with the spray direction of the inner air curtain ring 161. The electrostatic emission needle array 165 is connected to an adjustable polarity high voltage power supply 166.

[0115] Among them, the air curtain generated by the double-ring edge air curtain generator 160 and the electrostatic field act together on the edge areas of both sides of the guzheng, forming the core execution unit of the electrostatic air curtain coupled spraying path;

[0116] The rotating base 131 serves as the core support structure for the nozzle. It is connected to the output end of the lifting device 120 via a coaxial fixing method, enabling the nozzle to move vertically and rotate horizontally. It integrates a high-voltage electrostatic generator 150 to provide energy for subsequent electrostatic spraying. The rotation function of the rotating base 131 allows the nozzle to cover the spraying requirements of different angles on the surface of the guzheng, while ensuring the stability of power transmission with the lifting device 120.

[0117] Multiple central main nozzles 132 are evenly distributed around the circumference of the rotating base 131, forming the main spraying unit. The conductive electrodes 141 built into the nozzles are connected to the high-voltage electrostatic generator 150 through insulated through-wall wires 142, which makes the sprayed paint particles charged and forms an electrostatic adsorption effect. This design achieves two core functions: improving the adhesion efficiency of paint on the surface of the guzheng through electrostatic effect; and using the electric field to guide the directional movement of paint particles and reduce paint mist diffusion. The central main nozzles 132 are responsible for the fine spraying of the main body area of ​​the guzheng, ensuring the uniformity of the paint film thickness.

[0118] The dual-ring edge air curtain generator 160 comprises a nested double-layer structure specifically optimized for spraying the curved side area of ​​the guzheng: the inner ring air curtain 161 consists of micro-holes 162 evenly distributed around the outer periphery of the rotating base 131, and is connected to an external air supply device through a second delivery pipe 163. Its spray direction is perpendicular to the normal of the guzheng surface, forming a gas barrier around the paint spray flow, mainly performing the following functions: constraining the spraying range of the central main nozzle 132 to prevent paint from splashing into non-target areas; and adjusting the deposition pattern of paint particles on the side curved surface by controlling the air curtain flow rate.

[0119] The outer electrostatic ring 164 is composed of an array of electrostatic emission needles 165 arranged around the outer edge of the inner air curtain ring 161. It is connected to an adjustable polarity high-voltage power supply 166. Its discharge end points towards the side surface of the guzheng and forms an acute angle with the spray direction of the inner air curtain ring 161, realizing bidirectional synergistic control: the electrostatic field generated by the electrostatic emission needle array 165 and the electric field of the central main nozzle 132 form a superposition effect, enhancing the paint adsorption force in the side area; the air curtain-electric field coupling effect in the acute angle direction guides the paint to extend and cover the edge transition area along the side curved surface of the guzheng, eliminating the boundary accumulation phenomenon of traditional spraying;

[0120] The dual-ring edge air curtain generator 160 forms a three-dimensional dynamic spraying path correction system through the coupling effect of aerodynamics and electrostatic field: Air curtain guidance: The airflow of the inner ring air curtain 161 forms a physical isolation layer to constrain the spraying range; Electric field correction: The outer ring electrostatic ring 164 actively controls the movement trajectory of paint particles on complex curved surfaces by adjusting the intensity and polarity of the electrostatic field; Edge reinforcement: The acute angle synergy of the air curtain and the electric field makes the paint form a gradient transition coating on the side edge area of ​​the guzheng, avoiding paint film defects at sharp edges;

[0121] The rotating nozzle 130 achieves continuous full-coverage spraying of the guzheng surface from the central area to the side curved surface by organically combining the motion freedom of the rotating base 131, the main body spraying of the central main nozzle 132, and the boundary control of the double-ring edge air curtain generator 160. Among them, the coupling effect of physical isolation of the air curtain and dynamic guidance of the electric field significantly improves the spraying accuracy and edge treatment quality of the complex instrument surface.

[0122] Specifically, the adaptive adsorption and flipping mechanism 200 includes:

[0123] Support base 210;

[0124] The central support 240 includes a central column 241 fixed to the center of the upper surface of the support base 210, a transverse fixing beam 242 fixed to the top of the central column 241, and a flexible support array 230 fixed to both ends of the transverse fixing beam 242.

[0125] The flexible support array 230 is composed of multiple independent floating units 231, each independent floating unit 231 comprising:

[0126] Bottom support plate 232;

[0127] A miniature servo piezoelectric ceramic actuator 233 is fixed on the bottom support plate 232;

[0128] Silicone carbon fiber composite elastic layer 234 fixedly disposed at the driving end of the micro servo piezoelectric ceramic actuator 233;

[0129] A pressure sensor 235 is embedded at the top of the silicone carbon fiber composite elastic layer 234;

[0130] The input terminal of the central controller 400 is connected to all the pressure sensors 235, and the output terminal is connected to all the micro servo piezoelectric ceramic actuators 233 respectively. It is used to independently adjust the displacement of each micro servo piezoelectric ceramic actuator 233 according to the real-time feedback value of each pressure sensor 235, so that all independent floating units 231 can work together to fit the curved surface of the guzheng backboard and support the dynamic posture adjustment.

[0131] The support base 210 serves as the main bearing platform of the mechanism. Through its rigid structural design, the support base 210 provides stable support for the entire flipping mechanism. Its surface layout includes the installation interface of the central support 240 and auxiliary functional units such as the moving slide 211. It is the core reference surface for the positioning and posture adjustment of the guzheng workpiece.

[0132] The central support 240 is a three-dimensional support frame consisting of a central column 241, a transverse fixing beam 242, and a flexible support array 230. The central column 241 is vertically fixed to the center of the support base 210, serving as the axial reference for the entire support system and ensuring the symmetry of the force transmission path. The transverse fixing beam 242 is horizontally rigidly connected to the top of the central column 241, forming a cantilever structure extending on both sides, providing an installation base for the flexible support array 230. The flexible support array 230 is symmetrically distributed at both ends of the transverse fixing beam 242, serving as a functional unit that directly contacts the back of the guzheng, achieving active contact with the curved surface.

[0133] The flexible support array 230 is a distributed intelligent support system composed of multiple independent floating units 231. Each independent floating unit 231 includes the following key components: a bottom support plate 232, which serves as the unit's basic installation platform and is fixed to a preset position on the transverse fixed beam 242 to ensure the positioning accuracy of each unit; a micro servo piezoelectric ceramic actuator 233, a high-precision displacement actuator mounted on the bottom support plate 232, which outputs nanometer-level displacement by receiving instructions from the central controller 400 to achieve dynamic adjustment of the support height; a silicone carbon fiber composite elastic layer 234, a flexible contact layer integrated at the top of the actuator, whose elastic modulus gradient change characteristics can adaptively disperse local pressure to avoid damage to the guzheng backboard due to hard contact; and a pressure sensor 235, a feedback element embedded at the top of the elastic layer, which monitors the contact pressure value with the guzheng backboard in real time and uploads it to the central controller 400.

[0134] The central controller 400 achieves surface fitting and attitude adjustment through the following closed-loop control logic:

[0135] Pressure sensing stage: The pressure sensors 235 of each independent floating unit 231 collect pressure distribution data in real time in the contact area of ​​the guzheng backboard;

[0136] Data analysis phase: The central controller 400 calculates the actual curved surface shape of the guzheng backboard based on the pressure distribution pattern and generates the expected displacement of each support unit.

[0137] During the adjustment phase: the micro servo piezoelectric ceramic actuator 233 precisely adjusts its own extension and contraction according to the instructions, causing the silicone carbon fiber composite elastic layer 234 to change in height, so that the top of all independent floating units 231 forms a curved profile that is completely in contact with the back of the guzheng.

[0138] Dynamic balancing stage: Continuously monitor pressure changes during the spraying process and eliminate support force fluctuations caused by workpiece vibration or mechanism movement through iterative adjustments;

[0139] This organization achieves two core functions through a multi-layered collaborative structure:

[0140] Curved surface adaptive support: The distributed active adjustment capability of the flexible support array 230 enables the rigid support base 210 to accurately fit the back plate of the guzheng with arbitrary curvature, solving the problem of low matching degree between traditional fixtures and irregular workpieces.

[0141] Dynamic posture maintenance: During the spraying operation, real-time pressure feedback and actuator compensation are used to offset the displacement deviation caused by the rotation or vibration of the guzheng, ensuring that the workpiece always maintains stable contact during the spatial posture change process.

[0142] The adaptive adsorption and flipping mechanism 200 breaks through the rigidity limitations of traditional spraying fixtures by integrating high-precision sensing, distributed drive and intelligent control technologies. Its biomimetic design of flexible support array 230 can not only achieve precise curvature fitting of the guzheng backboard, but also dynamically adapt to the complex working conditions in the spraying process, providing a reliable process foundation for high-quality surface treatment.

[0143] Specifically, the adaptive adsorption and flipping mechanism 200 further includes an arc-shaped inverted component 250, which includes:

[0144] Side wing fixing rings 251 are mirror-symmetrically arranged on both sides of the supporting base 210;

[0145] The sliding block 252 is movably installed in the arc-shaped guide rail groove 101 on the inner side wall of the sealed spraying chamber 100, and is fixedly connected to the end of the side wing fixing ring 251.

[0146] The arc-shaped guide rod 253 has one end fixedly installed on the side wall of the sliding block 252, and the other end slidably fitted on the inner wall of the arc-shaped guide groove 101.

[0147] A drive motor 254 is embedded in the side wall of the arc-shaped guide rail groove 101, and its output shaft is fixedly mounted with a drive gear 255.

[0148] The rack 256 is fixed to the side wall of the arc-shaped guide rod 253 along its length direction and meshes with the drive gear 255;

[0149] The drive motor 254 drives the arc-shaped guide rod 253 to move the sliding block 252 along the arc-shaped guide groove 101 through the meshing transmission of the drive gear 255 and the rack 256, thereby driving the support base 210 to rotate 180 degrees around the horizontal axis to realize the dynamic posture adjustment.

[0150] The arc-shaped inverted component 250 is a key mechanical structure in the adaptive adsorption and flipping mechanism 200 that realizes the overall flipping function of the guzheng workpiece. Its function is to complete the stable, precise and controllable 180-degree flipping action of the support base 210 and the guzheng it supports, so as to meet the process requirements of double-sided spraying of the guzheng.

[0151] The side wing fixing rings 251 are mirror-symmetrically arranged on both sides of the support base 210. They serve as rigid connection transition components between the support base 210 and the arc-shaped inverted assembly 250, reliably transmitting the rotational motion of the support base 210 to the subsequent transmission mechanism and ensuring balanced force and synchronized posture on both sides during the flipping process.

[0152] The sliding block 252 is movably installed in the arc-shaped guide rail groove 101 provided on the inner side wall of the sealed spraying chamber 100. Its movement trajectory is strictly limited by the geometry of the arc-shaped guide rail groove 101. The sliding block 252 is fixedly connected to the end of the side wing fixing ring 251, thereby keeping the rotation axis of the supporting base 210 consistent with the curvature center of the arc-shaped guide rail groove 101, ensuring that the flipping process is a pure rotation rather than translation or sway.

[0153] One end of the arc-shaped guide rod 253 is fixedly installed on the side wall of the sliding block 252, and the other end slides along the inner wall of the arc-shaped guide groove 101. It plays the role of guiding and constraining the movement path of the sliding block 252, while enhancing the structural rigidity and torsional resistance of the entire flipping mechanism during the movement process, and preventing jamming or deformation caused by uneven force.

[0154] The drive motor 254 is embedded in the side wall of the arc-shaped guide rail groove 101, serving as the power source for the flipping action. The drive gear 255 is fixedly mounted on its output shaft, forming the core transmission element of the power output end.

[0155] The rack 256 is fixed to the side wall of the arc-shaped guide rod 253 along its length and maintains continuous meshing with the drive gear 255. When the drive motor 254 starts, the rotational motion of the motor is converted into linear reciprocating motion of the arc-shaped guide rod 253 along its own axis through the meshing transmission of the drive gear 255 and the rack 256. This linear motion further drives the sliding block 252 to move along the arc-shaped guide groove 101 in an arc-shaped trajectory, and then pushes the support base 210 to complete a 180-degree rotation around the horizontal axis through the side wing fixing ring 251.

[0156] The entire arc-shaped inverted assembly 250, through the coordinated operation of the side wing fixing ring 251, sliding block 252, arc-shaped guide rod 253, drive motor 254, drive gear 255 and rack 256, can achieve a smooth switching of the guzheng from front to back without interrupting the spraying process, providing the necessary workpiece posture support for full-coverage spraying, and is the structural guarantee for the implementation of dynamic posture adjustment function;

[0157] Specifically, the adaptive adsorption flipping mechanism 200 further includes a micro-adsorption component 220, which includes:

[0158] The movable slider 221 is movably installed in the movable groove 211 at the upper end of the supporting base 210;

[0159] A servo motor 222 is fixedly installed on one side of the movable slide 211, and its output shaft is fixedly installed with a threaded rod 223, which is threadedly connected to the movable slider 221.

[0160] The servo motor 222 drives the threaded rod 223 to rotate, which in turn drives the movable slider 221 to reciprocate along the movable groove 211, thereby achieving precise positioning of the micro-adsorption component 220 at the edge of the guzheng.

[0161] The micro-adsorption component 220 is a functional module in the adaptive adsorption and flipping mechanism 200 that realizes stable positioning and flexible constraint of the edge area of ​​the guzheng. Its core function is to provide controllable, adjustable and non-contact auxiliary fixing support for the weak edge parts during the spraying and flipping process, in accordance with the overall curved shape of the guzheng.

[0162] The movable slider 221 is movably installed in the movable groove 211 provided on the upper end of the support base 210. As the moving carrier of the micro-adsorption component 220, its reciprocating sliding along the movable groove 211 provides the basic displacement capability for the spatial position adjustment of the subsequent adsorption execution unit, and ensures that the adsorption point is always within the effective coverage range of the edge contour of the guzheng.

[0163] The servo motor 222 is fixedly installed on one side of the movable slide 211 and serves as the driving source for the displacement movement of the movable slider 221. It runs smoothly, responds quickly, and has high positioning accuracy, which can meet the process requirements of dynamic adaptation of the adsorption point under different specifications and sizes of the guzheng.

[0164] The threaded rod 223 is fixedly installed on the output shaft of the servo motor 222, and its axis is consistent with the length direction of the moving slide 211. The threaded rod 223 and the moving slider 221 form a threaded connection relationship. When the servo motor 222 starts and drives the threaded rod 223 to rotate, the rotational motion is converted into the linear motion of the moving slider 221 along the moving slide 211 through the thread transmission principle, thereby realizing the precise reciprocating motion of the moving slider 221 on the support base 210.

[0165] Specifically, the micro-adsorption component 220 further includes a micro-adsorption fixing column 224, the micro-adsorption fixing column 224 comprising:

[0166] An electric telescopic cylinder 2241 has its cylinder body movably mounted on the top of the movable slider 221 via a detachable seat 2242, and a micro-adsorption head 2243 is fixedly mounted on its telescopic end.

[0167] The micro-adsorption head 2243 includes a central adsorption disk 2244 and an edge adsorption disk 2245 surrounding the central adsorption disk 2244. The central adsorption disk 2244 is connected to a first air pump 2247 through a first air supply pipe 2246, and the edge adsorption disk 2245 is connected to a second air pump 2249 through a second air supply pipe 2248.

[0168] Vacuum sensors 225 are respectively disposed inside the central adsorption disk 2244 and the edge adsorption disk 2245;

[0169] The central controller 400 independently adjusts the pumping rates of the first air pump 2247 and the second air pump 2249 based on the feedback signal from the vacuum sensor 225, thereby forming the vacuum gradient control and enabling the micro-adsorption fixing column 224 to adapt to different thicknesses and curvatures of the guzheng edge.

[0170] The micro-adsorption fixing column 224 is the core execution component in the micro-adsorption assembly 220 that directly performs the adsorption function. Its structural design takes into account adjustability, adaptability and responsiveness, and is specially designed to deal with the natural differences in thickness, curvature and surface condition of the edge area of ​​the guzheng.

[0171] The cylinder body of the electric telescopic cylinder 2241 is movably mounted on the top of the movable slider 221 via a detachable seat 2242. This connection method facilitates overall disassembly and maintenance. The telescopic end of the electric telescopic cylinder 2241 is fixedly mounted with a micro-adsorption head 2243. Through the telescopic movement, the micro-adsorption head 2243 is actively fed and retracted in the vertical direction, so that it can dynamically adjust the contact distance according to the actual height and gap of the guzheng edge, avoiding workpiece damage or adsorption failure caused by rigid contact.

[0172] The micro-adsorption head 2243 is composed of a central adsorption disk 2244 and an edge adsorption disk 2245 arranged around the central adsorption disk 2244, forming a dual-zone synergistic adsorption structure. The central adsorption disk 2244 is located at the center of the micro-adsorption head 2243 and undertakes the main adsorption force output task. It is suitable for relatively flat or thick areas in the middle of the edge of the guzheng. The edge adsorption disks 2245 are arranged around the central adsorption disk 2244 in a ring shape. They are used to cover the edge transition area and the parts with drastic curvature changes, and enhance the enveloping ability of irregular contours. The first air supply pipe 2246 connects the central adsorption disk 2244 to the first air pump 2247, and the second air supply pipe 2248 connects the edge adsorption disk 2245 to the second air pump 2249. The two sets of air supply paths are independent of each other, providing a physical basis for implementing differentiated vacuum control.

[0173] Vacuum sensors 225 are respectively installed inside the central adsorption disk 2244 and the edge adsorption disk 2245 to monitor the actual negative pressure value in their respective cavities in real time and transmit the signal to the central controller 400. Based on the feedback signals from the two vacuum sensors 225, the central controller 400 outputs independent control commands to the first air pump 2247 and the second air pump 2249 to adjust their pumping speed, thereby creating a controllable vacuum pressure difference between the central adsorption disk 2244 and the edge adsorption disk 2245, i.e., vacuum gradient control.

[0174] This vacuum gradient control mechanism enables the micro-adsorption fixing column 224 to apply an appropriate adsorption intensity to different thickness areas of the guzheng edge within the same working cycle. For example, a higher vacuum is used to ensure stability in the thicker head section, while the vacuum of the edge adsorption plate 2245 is reduced in the thinner side transition area to prevent local deformation. At the same time, it can also respond to curvature changes and adjust the adsorption force distribution on both sides to ensure that the micro-adsorption head 2243 always maintains a good fit with the edge surface, effectively improving the positioning accuracy and operational safety of the guzheng throughout the spraying and flipping process.

[0175] Specifically, the paint mist filtration module 310 includes:

[0176] The circulating filter box 311 has a first composite filter layer 312 inside;

[0177] The circulating filter tube 313 is connected at one end to the circulating filter box 311 and at the other end extends into the sealed spraying chamber.

[0178] The first composite filter layer 312 includes:

[0179] The first filter layer 314 is made of polyester fiber non-woven fabric;

[0180] The second filter layer 315 is made of activated carbon adsorption material;

[0181] The third filter layer 316 is made of high-efficiency air filtration material;

[0182] The fourth filter layer 317 is made of photocatalytic oxidation material;

[0183] A redundant circuit pipe 318 is equipped with a normally closed control valve 319.

[0184] The paint mist filtration module 310 performs graded purification of the paint mist generated during the spraying process, providing a clean air source for the closed-loop utilization of resources.

[0185] The paint mist filtration module 310 is the core functional unit responsible for the treatment of gaseous pollutants in the recycling subsystem. Its role is to carry out multi-stage, orderly and efficient purification treatment of the paint mist-containing airflow generated by the spraying operation in the closed spraying chamber, thereby ensuring the air quality in the chamber, reducing the risk of environmental pollution, and providing a clean air source that meets the process requirements for subsequent closed-loop utilization of resources.

[0186] The circulating filter box 311 serves as the main supporting structure of the paint mist filter module 310. The first composite filter layer 312 is integrated inside, providing a stable installation space and airflow guiding channel for each filter level. Its structure has good sealing performance, ensuring that all airflow is purified through the first composite filter layer 312, and avoiding bypass leakage.

[0187] One end of the circulating filter pipe 313 is connected to the circulating filter box 311, and the other end extends into the sealed spraying chamber, forming a key connection section of the airflow circulation path. This pipe is used to continuously introduce polluted air carrying paint mist into the sealed spraying chamber into the circulating filter box 311, and after purification, send clean air back to the spraying chamber to achieve dynamic clean maintenance of the spraying environment.

[0188] The first composite filter layer 312 is located inside the circulating filter box 311 and consists of four layers of complementary filter materials stacked sequentially to form a progressively enhanced purification system. The first filter layer 314 is made of polyester fiber non-woven fabric and mainly undertakes the mechanical interception of large particles of paint mist droplets and dust, playing a primary coarse filtration role and effectively protecting subsequent filter layers from high-load clogging. The second filter layer 315 is made of activated carbon adsorption material, which captures organic solvents and small molecule odor substances volatilized during the spraying process through physical adsorption and partial chemical adsorption. The first layer significantly reduces VOC concentration; the second layer 316 is made of high-efficiency air filtration material with a fine fiber structure and high dust holding capacity, which can trap micron-sized paint mist particles and colloidal suspensions that remain after the first two layers of treatment, improving the air cleanliness level; the third layer 317 is made of photocatalytic oxidation material, which generates active oxygen species under the excitation of a specific wavelength light source, deeply decomposing the trace organic vapors and residual paint mist components that are difficult to be adsorbed or filtered, and converting them into harmless small molecules such as carbon dioxide and water, achieving end-point purification and odor elimination.

[0189] The redundant loop pipe 318 and normally closed control valve 319 in the paint mist filtration module 310 are not used for regular airflow circulation. Their function is as an emergency backup path, activated only under specific operating conditions. Under normal operating conditions, the paint mist-containing gas in the sealed spray chamber enters the condenser-centrifugal coupler 330 via the return pipe 343. After primary separation and condensation recovery of the paint mist droplets, it is then transported to the circulating filter box 311 for further purification. At this time, the redundant loop pipe 318 is in a completely isolated state, and the normally closed control valve 319 on it remains closed and does not participate in the airflow path. The function of the redundant loop pipe 318 is to provide a backup for the condenser-centrifugal coupler. The backup circuit is activated when the coupler 330 is in a non-operating state or malfunctions. When the central controller 400 detects that the condensing centrifugal coupler 330 has stopped, has an abnormal speed, exceeds the condensing temperature limit, or has a centrifugal separation efficiency lower than the threshold, or receives a relevant fault alarm signal, it automatically issues a command to open the normally closed control valve 319. At this time, the paint mist gas bypasses the failed condensing centrifugal coupler 330 and is directly introduced into the circulating filter box 311 through the redundant loop pipe 318. The first composite filter layer 312 undertakes all the purification tasks, ensuring that the paint mist treatment function is not interrupted and maintaining the continuity and safety of the airflow circulation in the sealed spraying chamber.

[0190] In summary, the paint mist filtration module 310, through the coordinated operation of the circulating filter box 311, the circulating filter pipe 313, the first composite filter layer 312, the first filter layer 314, the second filter layer 315, the third filter layer 316, the fourth filter layer 317, the redundant loop pipe 318, and the normally closed control valve 319, constructs a complete, reliable, and maintainable graded purification system, effectively supporting the strict requirements of resource closed-loop utilization for air source cleanliness;

[0191] Specifically, the waste liquid regeneration module 320 includes:

[0192] An outlet pipe 321 is provided through the bottom of the sealed spraying chamber 100. An inclined guide surface 102 is provided at the bottom of the sealed spraying chamber 100. The lower end of the inclined guide surface 102 is connected to the outlet pipe 321.

[0193] The purification and reuse box 322 is located at the bottom of the outflow pipe 321. The four corners are bolted to the bottom of the sealed spraying chamber 100 by fixing support rods 323. The top is provided with a connection interface 324, and the outflow pipe 321 is sealed and inserted into the connection interface 324.

[0194] A detachable insert plate 325 is horizontally installed on the upper part of the purification and reuse box 322 by magnetic attraction. A second composite filter layer 326 is integrated inside the detachable insert plate 325.

[0195] The second composite filter layer 326 includes:

[0196] The primary filter layer 327 is made of stainless steel mesh.

[0197] The middle filter layer 328 is made of modified diatomaceous earth filter media;

[0198] The high-filtration layer 329 is made of ion exchange resin;

[0199] The waste liquid regeneration module 320 converts dripping waste liquid into reusable components, forming the liquid phase basis for the closed-loop utilization of resources.

[0200] Waste liquid regeneration module 320 is the core functional unit of the resource closed-loop utilization system to realize the recovery and regeneration of liquid phase materials. Its design focuses on the efficient collection, gradient purification and component reconstruction of liquid waste such as natural dripping, condensation deposition and cleaning residue during the spraying process, providing a stable, clean and compositionally controllable regeneration liquid source for the recycling of paint diluent, cleaning solvent or process water.

[0201] The outflow pipe 321 is installed through the bottom of the sealed spraying chamber 100 and is sealed to the chamber structure. Its inlet end is connected to the lower end of the inclined guide surface 102 at the bottom of the chamber, ensuring that the waste liquid driven by gravity can quickly converge along the inclined guide surface 102 and flow into the outflow pipe 321 in one direction, avoiding the risk of liquid accumulation, retention and local corrosion. The slope of the inclined guide surface 102 is optimized by hydrodynamics (preferably 3°–8°) to take into account both the guiding efficiency and structural strength. The surface is treated with a paint-repellent coating to reduce the tendency of paint residue to adhere.

[0202] The purification and reuse box 322 is located directly below the outflow pipe 321. It serves as an integrated container for temporary storage, filtration, and buffering of waste liquid. Its four corners are rigidly installed at the bottom of the sealed spraying chamber 100 by bolts through fixed support rods 323, which ensures structural stability and facilitates overall disassembly and maintenance. The interface 324 opened at the top forms an airtight plug-in structure with the lower end of the outflow pipe 321 (such as O-ring seal + snap-lock limit), ensuring that there is no leakage or volatilization during the waste liquid transportation process.

[0203] The detachable insert plate 325 adopts a horizontal insertion structure and achieves quick positioning and stable locking through a high-holding-force neodymium iron boron magnetic array. Installation and replacement can be completed without tools. It integrates a second composite filter layer 326, which forms the main filtration barrier for waste liquid purification. This insert plate design significantly improves the convenience of maintenance. When the filter material is saturated or the formula needs to be changed, the entire piece can be replaced simply by turning off the power, opening the cover, and pulling out the insert plate, which greatly reduces downtime.

[0204] The second composite filter layer 326 consists of three functionally distinct and sequentially coordinated filter units: the primary filter layer 327 uses a stainless steel mesh (preferably with a pore size of 150–200 μm) to intercept large paint sludge particles, fibrous impurities, and un-atomized dried particles, preventing subsequent filter layer blockage and extending the overall service life; the secondary filter layer 328 uses modified diatomaceous earth filter media, treated with surface amino / epoxy groups, possessing both physical adsorption and chemical complexation capabilities, effectively removing suspended colloids, some pigment particles, and free emulsifiers, while simultaneously improving the turbidity and zeta potential stability of the waste liquid; the tertiary filter layer 329 uses a special ion exchange resin (such as a mixture of strong acidic cation exchange resin and weakly basic anion exchange resin) to directionally remove residual metal ions (Fe2+) from the waste liquid. 2+ / Cu 2+ The regenerated solution is free from catalytic impurities, organic acid radicals, degradation products of amine corrosion inhibitors, and trace electrolytes, which significantly improves the consistency of conductivity and chemical compatibility, ensuring its reliability for reuse in dilution, color adjustment, or cleaning processes.

[0205] Specifically, the condenser centrifugal coupler 330 includes:

[0206] The condenser 331 is divided vertically into a condensation chamber 332, a centrifugal chamber 333, and an ultraviolet catalytic chamber 334.

[0207] The third delivery pipe 335 has its upstream end connected to the air outlet of the paint mist filter module 310, and its downstream end spiraling down along the inner wall of the condensation chamber 332 and extending into the centrifugal chamber 333.

[0208] The fourth conveying pipe 336 has its upstream end connected to the outlet of the waste liquid regeneration module 320, and its downstream end extends vertically into the condensation chamber 332 along the central axis and into the centrifuge chamber 333.

[0209] A condenser plate 337 is disposed on the inner wall of the condenser cavity 332;

[0210] A high-speed centrifuge 338 is disposed within the centrifuge chamber 333;

[0211] The ultraviolet catalytic chamber 334 is equipped with an ultraviolet lamp assembly 339.

[0212] The return pipe 340 has its upstream end connected to the bottom of the ultraviolet catalytic chamber 334 and its downstream end connected to an external liquid supply device. A precision filter 341 and a flow regulating valve 342 are provided on the return pipe 340.

[0213] The return gas pipe 343 has its upstream end connected to the top of the ultraviolet catalytic chamber 334 and its downstream end extended into the interior of the sealed spraying chamber 100. An electric air valve 344 is provided on the return gas pipe 343.

[0214] The condensing centrifugal coupler 330 simultaneously regenerates gaseous residues and liquid waste to generate recycled coatings, which are then transported to the rotary nozzle 130, completing the final stage of the closed-loop resource utilization.

[0215] The condensing centrifugal coupler 330 is a core hub device in the resource closed-loop utilization system to realize "gas-liquid synergistic regeneration and multiphase coupling purification". Its innovation lies in the orderly coupling of three physical and chemical processes of paint mist condensation and recovery, waste liquid centrifugal separation and photocatalytic deep purification in an integrated cavity, and finally producing recycled paint components that can be directly reused in the spraying process.

[0216] The condenser 331 adopts a vertical compartmentalized design, which is divided into a condenser 332, a centrifugal chamber 333 and an ultraviolet catalytic chamber 334 from top to bottom. The three are connected by precision guide holes to ensure that the material is transferred in sequence and avoids gas-liquid back mixing and process short circuit.

[0217] The upstream end of the third delivery pipe 335 (gas phase channel) is connected to the outlet of the paint mist filtration module 310, which is the clean airflow after preliminary purification by the first composite filter layer 312. Its downstream end is arranged in a spiral downward path along the inner wall of the condensation chamber 332, which greatly prolongs the airflow residence time and enhances the heat exchange area with the condensation plate 337. The spiral end extends to the upper part of the centrifuge chamber 333, so that the fine paint mist droplets condensed and precipitated enter the centrifuge area with the inertia of the airflow, providing a pre-enrichment basis for subsequent centrifugal collection.

[0218] The upstream end of the fourth delivery pipe 336 (liquid phase channel) is connected to the outlet of the waste liquid regeneration module 320, which is the regenerated liquid that has been initially purified by the second composite filter layer 326. Its downstream end extends vertically into the condensation chamber 332 along the central axis and forms a coaxial counter-current liquid inlet structure in the centrifuge chamber 333. This design allows the low-temperature regenerated liquid and the micro-droplet-containing airflow from the third delivery pipe 335 to undergo controllable temperature difference mixing and interface disturbance in the centrifuge chamber 333. On the one hand, it promotes the further cold condensation and aggregation of residual paint mist droplets in the gas phase, and on the other hand, it improves the aggregation efficiency of suspended particles in the liquid phase, achieving gas-liquid dual-phase synergistic effect.

[0219] The condenser plate 337 is located on the inner wall of the condenser chamber 332 and has a built-in high-efficiency phase change cooling medium circulation loop (such as R134a low-temperature working fluid). The surface temperature is stably maintained at 5–10℃, which can cause the residual volatile organic carriers and incompletely filtered submicron-sized paint mist droplets in the airflow to undergo phase change condensation and be converted into collectable liquid components, significantly improving the paint recovery rate (measured recovery rate ≥92.6%).

[0220] The high-speed centrifuge 338 is placed in the center of the centrifuge chamber 333, and its speed can be steplessly adjusted between 3000 and 8000 rpm. Its core is a multi-stage conical drum + dynamic guide vane structure. Under the action of a strong centrifugal force field, it performs high-precision classification and separation of the condensate and regenerated liquid mixture: the heavy phase (high solid content paint slurry, metal impurities, colloidal precipitates) settles to the outer periphery and is guided to the bottom slag discharge port; the light phase (clarified regenerated liquid, low viscosity dilution components, stable dispersed phase) is enriched towards the center and introduced into the ultraviolet catalytic chamber 334;

[0221] The ultraviolet catalytic chamber 334 is located at the bottom layer and has a built-in array of ultraviolet lamps 339 (main wavelength 254nm + 185nm dual-band). Together with the TiO2 / WO3 heterojunction photocatalyst coating loaded on the inner wall of the chamber, it continuously generates active hydroxyl radicals and superoxide anions under ultraviolet excitation. This deeply mineralizes the trace amounts of free monomers, oligomers, surfactant degradation intermediates and microorganisms remaining in the light phase after centrifugation. Simultaneously, it achieves decolorization, deodorization, sterilization and molecular chain reconstruction, so that the regenerated liquid meets the quality standards for spray coating.

[0222] The upstream end of the return pipe 340 is connected to the bottom of the ultraviolet catalytic chamber 334. The high-quality regenerated liquid that has completed the entire regeneration process is transported. A precision filter 341 and a flow regulating valve 342 are installed in sequence on the pipeline. The former completely intercepts the nano-sized catalyst particles that may be generated during the photocatalysis process, while the latter dynamically matches the liquid supply rate according to the real-time spraying parameters (flow rate, atomization pressure, workpiece curvature) of the rotating nozzle 130 to ensure spraying consistency.

[0223] The upstream end of the return gas pipe 343 is connected to the top of the ultraviolet catalytic chamber 334, and the clean carrier gas (mainly air and a trace amount of inert protective gas) after being deeply purified by the ultraviolet catalytic chamber 334 is transported. Its downstream end extends back into the sealed spraying chamber 100, forming a closed-loop main gas source passage. An electric air valve 344 is installed on the pipeline, and the opening degree is adjusted in real time by the central controller 400 according to the chamber pressure, VOCs concentration and spraying rhythm to realize intelligent optimization of airflow distribution, and ensure stable positive pressure and reasonable airflow organization in the spraying environment.

[0224] In summary, the condensing centrifugal coupler 330 is not simply a series of units connected in series. Instead, it uses a four-stage coupling mechanism that enhances heat transfer through spiral condensation, promotes phase change through axial counter-current, achieves solid-liquid separation through high-speed centrifugation, and completes molecular-level regeneration through ultraviolet catalysis. This mechanism transforms waste paint mist and waste liquid, which originally required multiple devices and processes, into regenerated paint with controllable composition, stable performance, and the ability to directly drive the rotating spray head 130 for high-quality spraying.

[0225] Specifically, the central controller 400 is a programmable logic controller. Its input terminals are connected to the pressure sensor 235, the vacuum sensor 225, and the flow sensors on each delivery pipeline. Its output terminals are connected to the drive motor 254, the servo motor 222, the high-voltage electrostatic generator 150, the first air pump 2247, the second air pump 2249, the high-speed centrifuge 338, the ultraviolet lamp group 339, the flow regulating valve 342, and the electric air valve 344, respectively.

[0226] The central controller 400, according to a preset process program, synchronously coordinates the spraying trajectory of the rotating nozzle 130, the attitude adjustment of the adaptive adsorption and flipping mechanism 200, the air volume adjustment of the paint mist filtration module 310, the liquid level control of the waste liquid regeneration module 320, and the regeneration parameters of the condenser centrifugal coupler 330, to achieve integrated and coordinated control of the full-coverage spraying of the guzheng surface and the closed-loop utilization of resources.

[0227] Example:

[0228] Workpiece entry into the chamber and adaptive adsorption positioning

[0229] The guzheng workpiece is placed into the designated station in the sealed spraying chamber 100; the central controller 400 starts the adaptive adsorption flipping mechanism 200: the servo motor 222 drives the threaded rod 223, which drives the moving slider 221 to move along the moving slide 211 to the preset position; the electric telescopic cylinder 2241 extends, so that the micro adsorption head 2243 fits against the edge of the guzheng; the first air pump 2247 and the second air pump 2249 start synchronously, and the vacuum sensor 225 provides real-time feedback on the negative pressure value of the central adsorption plate 2244 and the edge adsorption plate 2245; the central controller 400 dynamically adjusts the speed of the two pumps according to the difference in vacuum between the two channels, and independently controls the pressure through the first air supply pipe 2246 and the second air supply pipe 2248 to achieve adaptive, equal stiffness, and traceless adsorption of the entire edge of the instrument by the micro adsorption fixing column 224; after the adsorption force stabilizes (≥−85kPa), the system locks the position and enters the spraying preparation state.

[0230] Gas phase main circulation start-up

[0231] The central controller 400 confirms adsorption completion and instructs the rotary nozzle 130 to start spraying. The paint mist-containing airflow within the sealed spray booth 100 is drawn out by the circulating filter pipe 313. The airflow first enters the circulating filter pipe 313 (a rigid, sealed pipe, one end connected to the branch port of the return air pipe 343, and the other end horizontally inserted into the air inlet on the side wall of the circulating filter box 311). The airflow penetrates the first composite filter layer 312 within the circulating filter box 311, and sequentially passes through the first filter layer 314 (polyester fiber nonwoven fabric, intercepting droplets ≥50μm), the second filter layer 315 (activated carbon granular layer, adsorbing VOCs), the third filter layer 316 (high-efficiency air filter material, capturing 0.3–1μm particles), and the fourth filter layer 317 (a photocatalytic mesh loaded with TiO2, decomposing low-to-medium molecular weight organic matter). The purified airflow... The airflow is drawn from the bottom outlet of the circulating filter box 311 and connected to the upstream end of the third conveying pipe 335. The airflow enters the condensing centrifugal coupler 330 along the third conveying pipe 335, first entering the condensing chamber 332, spiraling down along the pipe wall, and exchanging heat with the condensing plate 337 (surface temperature 7±0.5℃), causing the residual submicron paint mist droplets to further condense and precipitate. The airflow carries the condensed droplets into the centrifugal chamber 333, where the gas-liquid separation is completely achieved under the action of the high-speed centrifuge 338 (5200rpm, 1620×g). The liquid phase settles and is recovered, while the gas phase enters the ultraviolet catalytic chamber 334 and is irradiated by the ultraviolet lamp group 339 (254nm+185nm) to complete the deep mineralization of residual organic molecules. The purified and qualified gas is discharged from the top of the ultraviolet catalytic chamber 334 and returned to the sealed spraying chamber 100 through the return air pipe 343, maintaining positive pressure and airflow organization.

[0232] Step 3: Liquid Phase Regeneration Path

[0233] During spraying, the settled paint mist flows towards the lower end of the sealed spraying chamber 100 under the influence of gravity along the inclined guide surface 102 at the bottom, and flows into the outflow pipe 321. After being sealed through the interface 324, it is introduced into the purification and reuse box 322. The waste liquid flows vertically through the second composite filter layer 326 in the detachable insert plate 325. The primary filter layer 327 (stainless steel screen, 180μm pore size) traps large paint particles. The middle filter layer 328 (modified diatomaceous earth filter media) adsorbs colloidal and emulsified impurities. The high filter layer 329 (ion exchange resin) removes Fe. 2+ Cu 2+ The regenerated liquid, containing organic acid radicals, is collected at the bottom of the purification and reuse tank 322. The regenerated liquid is then pumped into the condensing centrifugal coupler 330 via the fourth delivery pipe 336 (the upstream end of which is connected to the bottom outlet of the purification and reuse tank 322, and the downstream end extends vertically into the central axis of the condensing centrifugal coupler 330). Inside the condensing chamber 332, the regenerated liquid undergoes heat and mass exchange with the airflow introduced by the third delivery pipe 335, participating in condensation enhancement and receiving final quality improvement from the ultraviolet catalytic chamber 334. Finally, the regenerated liquid is led out through the return pipe 340 (the upstream end of which is connected to the bottom drain of the ultraviolet catalytic chamber 334), passes through the precision filter 341 (0.5μm) and the flow regulating valve 342 (servo control), and is precisely supplied to the rotating nozzle 130.

[0234] Fault emergency switching

[0235] When the central controller 400 detects any of the following fault signals:

[0236] The temperature sensor reading of the condenser plate 337 remains >12℃ or <3℃ (timeout 5s).

[0237] The vibration acceleration of the high-speed centrifuge 338 is >8g;

[0238] The current of the 339 UV lamp assembly is zero and remains for >2 seconds;

[0239] The communication of the condenser centrifugal coupler 330 is interrupted.

[0240] Then immediately execute the emergency protocol:

[0241] Close the electric air valve 344 (cut off the passage from the return air pipe 343 to the condenser centrifugal coupler 330).

[0242] Open the normally closed control valve 319 (this valve is located on the redundant loop pipe 318, one end of which is connected to the air outlet of the circulating filter box 311, and the other end is connected to the return air pipe 343 and is located upstream of the electric air valve 344).

[0243] Forced change of airflow path:

[0244] Sealed spraying chamber 100 → circulating filter pipe 313 → circulating filter box 311 → redundant circuit pipe 318 (via the opened normally closed control valve 319) → sealed spraying chamber 100.

[0245] At this time, no airflow passes through the third delivery pipe 335 (because the electric air valve 344 is closed, a dead zone is formed upstream of it).

[0246] The condenser centrifugal coupler 330 is completely shut down, and the liquid supply of the fourth delivery pipe 336 is simultaneously suspended (the central controller 400 instructs to close its inlet solenoid valve).

[0247] The gas phase is purified and reused solely through the 311 four-stage filtration system in the circulating filter box, ensuring uninterrupted spraying operations.

[0248] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0249] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A surface coating device for a guzheng (Chinese zither), characterized in that, include: An integrated collaborative spraying system includes: The sealed spraying chamber (100) forms a sealed spraying cavity inside, and a cross-axis positioner (110) is provided on the top. The cross-axis positioner (110) drives the rotating nozzle (130) on the side wall through the lifter (120) to achieve three-dimensional dynamic spraying. An adaptive adsorption flipping mechanism (200) is located in the lower part of a sealed spraying chamber. It includes a support base (210) that can be flipped 180 degrees and symmetrically arranged micro adsorption components (220). The surface of the support base (210) is provided with a flexible support array (230). The curved surface of the guzheng backboard is fitted in real time through pressure feedback. The micro adsorption components (220) are adapted to the edge shape of the guzheng through vacuum gradient control. A recycling subsystem, integrated into the inner wall and bottom of a sealed spray booth (100), includes: The paint mist filtration module (310) uses a multi-layer composite filtration structure to classify and purify the paint mist generated during spraying. Waste liquid regeneration module (320) collects dripping waste liquid and treats it by centrifugation, condensation and ultraviolet catalysis to form recycled coating; A condensing centrifugal coupler (330) connects the paint mist filtration module (310) and the waste liquid regeneration module (320) to simultaneously regenerate gaseous residues and liquid waste. Among them, the electrostatic air curtain coupling spraying path of the rotating nozzle (130), the dynamic attitude adjustment of the adaptive adsorption flipping mechanism (200) and the waste recycling of the recycling subsystem are coordinated and controlled by the central controller (400) to realize the full-coverage spraying of the guzheng surface and the closed-loop utilization of resources.

2. The guzheng surface spraying equipment according to claim 1, characterized in that, The rotating nozzle (130) includes: A rotating base (131) is coaxially fixed to the output end of the elevator (120); Multiple central main nozzles (132) are evenly distributed around the circumference of the rotating base (131). Each central main nozzle (132) has a built-in conductive electrode (141) in its nozzle. The conductive electrode (141) is connected to a high-voltage electrostatic generator (150) integrated inside the rotating base (131) through an insulated through-wall wire (142). The dual-ring edge air curtain generator (160) includes: The inner air curtain ring (161) is composed of micro air holes (162) evenly distributed around the outer edge of the rotating base (131). Each micro air hole (162) is connected to an external air supply device through a second delivery pipe (163), and the spray direction is perpendicular to the normal of the guzheng surface. The outer electrostatic ring (164) is composed of an array of electrostatic emission needles (165) evenly distributed around the outer edge of the inner air curtain ring (161). The discharge end of each electrostatic emission needle array (165) faces the side surface of the guzheng and forms an acute angle with the spray direction of the inner air curtain ring (161). The electrostatic emission needle array (165) is connected to an adjustable polarity high voltage power supply (166). The air curtain generated by the dual-ring edge air curtain generator (160) and the electrostatic field work together on the side border areas of the guzheng, forming the core execution unit of the electrostatic air curtain coupled spraying path.

3. The guzheng surface spraying equipment according to claim 2, characterized in that, The adaptive adsorption and flipping mechanism (200) includes: Supporting base (210); The central support (240) includes a central column (241) fixed to the center of the upper surface of the support base (210), a transverse fixing beam (242) fixed to the top of the central column (241), and a flexible support array (230) fixed to both ends of the transverse fixing beam (242). The flexible support array (230) is composed of multiple independent floating units (231), each independent floating unit (231) including: Bottom support plate (232); A miniature servo piezoelectric ceramic actuator (233) is fixed on the bottom support plate (232). Silicone carbon fiber composite elastic layer (234) fixed to the drive end of the micro servo piezoelectric ceramic actuator (233). A pressure sensor (235) is embedded at the top of the silicone carbon fiber composite elastic layer (234). The input terminal of the central controller (400) is connected to all the pressure sensors (235), and the output terminal is connected to all the micro servo piezoelectric ceramic actuators (233). It is used to independently adjust the displacement of each micro servo piezoelectric ceramic actuator (233) according to the real-time feedback value of each pressure sensor (235), so that all independent floating units (231) can work together to fit the curved surface of the guzheng backboard and support the dynamic posture adjustment.

4. The guzheng surface spraying equipment according to claim 3, characterized in that, The adaptive adsorption flipping mechanism (200) further includes an arc-shaped inverted component (250), which comprises: Side wing fixing rings (251) are arranged in a mirror symmetrical manner on both sides of the supporting base (210); The sliding block (252) is movably installed in the arc-shaped guide groove (101) on the inner side wall of the sealed spraying chamber (100) and is fixedly connected to the end of the side wing fixing ring (251). An arc-shaped guide rod (253) is fixedly installed at one end on the side wall of the sliding block (252), and the other end is slidably fitted on the inner wall of the arc-shaped guide groove (101); A drive motor (254) is embedded in the side wall of the arc-shaped guide rail groove (101), and its output shaft is fixedly mounted with a drive gear (255). A rack (256) is fixed to the side wall of the arc-shaped guide rod (253) along its length direction and meshes with the drive gear (255); The drive motor (254) drives the arc-shaped guide rod (253) to move the sliding block (252) along the arc-shaped guide groove (101) through the meshing transmission of the drive gear (255) and the rack (256), thereby driving the support base (210) to rotate 180 degrees around the horizontal axis to realize the dynamic posture adjustment.

5. The guzheng surface spraying equipment according to claim 4, characterized in that, The adaptive adsorption flipping mechanism (200) further includes a micro-adsorption component (220), which includes: The movable slider (221) is movably installed in the movable groove (211) at the upper end of the supporting base (210); A servo motor (222) is fixedly installed on one side of the movable slide (211), and its output shaft is fixedly installed with a threaded rod (223), which is threadedly connected to the movable slider (221). The servo motor (222) drives the threaded rod (223) to rotate, which in turn drives the movable slider (221) to reciprocate along the movable groove (211), thereby achieving precise positioning of the micro-adsorption component (220) at the edge of the guzheng.

6. The guzheng surface spraying equipment according to claim 5, characterized in that, The micro-adsorption component (220) further includes a micro-adsorption fixing column (224), the micro-adsorption fixing column (224) comprising: An electric telescopic cylinder (2241) has its cylinder body movably mounted on the top of the movable slider (221) via a detachable seat (2242), and its telescopic end is fixedly mounted with a micro-adsorption head (2243). The micro-adsorption head (2243) includes a central adsorption disk (2244) and an edge adsorption disk (2245) arranged around the central adsorption disk (2244). The central adsorption disk (2244) is connected to a first air pump (2247) through a first air supply pipe (2246), and the edge adsorption disk (2245) is connected to a second air pump (2249) through a second air supply pipe (2248). Vacuum sensors (225) are respectively disposed inside the central adsorption disk (2244) and the edge adsorption disk (2245); The central controller (400) independently adjusts the pumping speed of the first air pump (2247) and the second air pump (2249) according to the feedback signal of the vacuum sensor (225) to form the vacuum gradient control, so that the micro-adsorption fixing column (224) can be adapted to the different thickness and curvature areas of the guzheng edge.

7. The guzheng surface spraying equipment according to claim 1, characterized in that, The paint mist filtration module (310) includes: The circulating filter box (311) is equipped with a first composite filter layer (312) inside. A circulating filter tube (313) is connected at one end to the circulating filter box (311) and at the other end extends into the sealed spraying chamber. The first composite filter layer (312) includes: The first filter layer (314) is made of polyester fiber nonwoven fabric; The second filter layer (315) is made of activated carbon adsorption material; The third filter layer (316) is made of high-efficiency air filtration material; The fourth filter layer (317) is made of photocatalytic oxidation material; A redundant loop pipe (318) is equipped with a normally closed control valve (319). The paint mist filtration module (310) performs graded purification of the paint mist generated during the spraying process, providing a clean air source for the closed-loop utilization of resources.

8. The guzheng surface spraying equipment according to claim 1, characterized in that, The waste liquid regeneration module (320) includes: An outflow pipe (321) is installed through the bottom of the sealed spraying chamber (100). An inclined guide surface (102) is provided at the bottom of the sealed spraying chamber (100), and the lower end of the inclined guide surface (102) is connected to the outflow pipe (321). The purification and reuse box (322) is located at the bottom of the outflow pipe (321). The four corners are bolted to the bottom of the sealed spraying chamber (100) by fixing support rods (323). The top is provided with a connection interface (324), and the outflow pipe (321) is sealed and inserted into the connection interface (324). The detachable insert plate (325) is horizontally installed on the upper part of the purification and reuse box (322) by magnetic attraction, and the second composite filter layer (326) is integrated inside the detachable insert plate (325). The second composite filter layer (326) includes: The primary filter layer (327) is made of stainless steel mesh. The middle filter layer (328) is made of modified diatomaceous earth filter media; The high filtration layer (329) is made of ion exchange resin; The waste liquid regeneration module (320) converts dripping waste liquid into reusable components, forming the liquid phase basis for the closed-loop utilization of resources.

9. The guzheng surface spraying equipment according to claim 1, characterized in that, The condenser centrifugal coupler (330) includes: The condenser (331) is divided into a condensation chamber (332), a centrifugal chamber (333) and an ultraviolet catalytic chamber (334) in sequence along the vertical direction. The third delivery pipe (335) has its upstream end connected to the air outlet of the paint mist filter module (310), and its downstream end spirals down along the inner wall of the condensation chamber (332) and extends into the centrifuge chamber (333). The fourth delivery pipe (336) has its upstream end connected to the outlet of the waste liquid regeneration module (320), and its downstream end extends vertically into the condensation chamber (332) along the central axis and into the centrifuge chamber (333). A condenser plate (337) is disposed on the inner wall of the condenser cavity (332); A high-speed centrifuge (338) is disposed inside the centrifuge chamber (333); The ultraviolet catalytic chamber (334) is equipped with an ultraviolet lamp assembly (339); The return pipe (340) is connected to the bottom of the ultraviolet catalytic chamber (334) at its upstream end and to an external liquid supply device at its downstream end. A precision filter (341) and a flow regulating valve (342) are provided on the return pipe (340). The return gas pipe (343) has its upstream end connected to the top of the ultraviolet catalytic chamber (334) and its downstream end extended to the interior of the sealed spraying chamber (100), and an electric air valve (344) is provided on the return gas pipe (343). The condensing centrifugal coupler (330) simultaneously regenerates gaseous residues and liquid waste, generating recycled coatings which are then transported to the rotary nozzle (130), completing the final stage of the closed-loop resource utilization.

10. The guzheng surface spraying equipment according to claim 1, characterized in that, The central controller (400) is a programmable logic controller. Its input terminal is connected to the pressure sensor (235), vacuum sensor (225) and flow sensors on each delivery pipeline. Its output terminal is connected to the drive motor (254), servo motor (222), high-voltage electrostatic generator (150), first air pump (2247), second air pump (2249), high-speed centrifuge (338), ultraviolet lamp group (339), flow regulating valve (342) and electric air valve (344). The central controller (400) synchronously coordinates the spraying trajectory of the rotating nozzle (130), the attitude adjustment of the adaptive adsorption flipping mechanism (200), the air volume adjustment of the paint mist filtration module (310), the liquid level control of the waste liquid regeneration module (320), and the regeneration parameters of the condenser centrifugal coupler (330) according to the preset process program, so as to realize the integrated collaborative control of the full-coverage spraying of the guzheng surface and the closed-loop utilization of resources.

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