658results about "Liquid spraying plants" patented technology

The invention discloses an electrostatic powder coating control method, which relates to the technical field of powder coating control, and comprises the following steps: a PLC (Programmable Logic Controller) control system is combined with a position encoder and a sensor to realize synchronous follow-up spraying of a spray gun on a workpiece, and the spraying voltage, current and powder supply parameters are dynamically adjusted according to the powder resistivity and the deposition state; in the workpiece curing process, PID control is adopted to guarantee that the temperature and the conveying speed are stable, and after spraying, the spraying time and path are corrected in a closed-loop mode in combination with film thickness detection data; the control system further constructs a multi-objective optimization model, and dynamically adjusts the spraying strategy according to the film thickness consistency and the beat efficiency. The problems that in the traditional spraying process, a spray gun is rigid in path, parameters are fixed, and quality feedback is lagged are solved, and high-consistency, high-efficiency and high-adaptability intelligent coating control is achieved.

The invention provides an intelligent coating method and system for a paint-free suite door. The method comprises the following steps: continuously scanning the surface of a door body through a multi-band optical detection device to obtain reflection intensity data of visible light and near-infrared bands, and synchronously collecting environment temperature and coating temperature data of a coating area; activating the composite electromagnetic shielding structure to absorb external interference, and transmitting the purified multi-source data through a star topology network; carrying out denoising processing on the reflection intensity based on a dynamic modeling algorithm, and carrying out dynamic calibration on the coating thickness model in combination with the real-time temperature parameters to generate a three-dimensional thickness distribution thermodynamic diagram; and the high-degree-of-freedom mechanical arm is driven to execute space trajectory compensation motion, and finally stress balance control in the coating curing process is achieved. According to the technical scheme provided by the invention, accurate control over the coating thickness uniformity and active inhibition of thermal stress in the coating process of the paint-free suite door are achieved, and the coating quality and the process stability are remarkably improved.

The invention discloses an electrostatic spraying device and method, electronic equipment and a storage medium. According to the electrostatic spraying device, a parameter combination optimization model is constructed, and the optimal parameter combination of electrode voltage and spraying distance is obtained through calculation based on the parameter combination optimization model in the mode of presetting the coating flow speed, the spraying pressure and the target charge-to-mass ratio; under the condition that the charge-to-mass ratio is restrained, the optimal electrostatic spraying parameter combination can be obtained through automatic calculation and adjusted and matched, the optimal electrode voltage can be adjusted and matched in a self-adaptive mode according to the spraying distance, the high-controllable self-adaptive adjusting capacity is achieved, and the uniformity of the electrostatic spraying deposition effect is greatly improved.

The invention discloses an intelligent industrial control system and method for electrostatic spraying of an aluminum veneer, and relates to the technical field of spraying control, and the control method comprises the following steps: generating a corresponding spraying record for each spraying process of the aluminum veneer; performing multi-dimensional quality evaluation to obtain a quality evaluation value of any spraying record; performing category division on the dimension data of each dimension to respectively obtain feature sets under different category dimensions; analyzing the difference condition of quality evaluation of each feature in the same category in different spraying records to obtain the correlation degree between the features in the same category; analyzing deviation conditions of different types of features in different spraying records to obtain influence degrees among different types of features; when the aluminum veneer is sprayed, data acquisition is synchronously carried out, a real-time evaluation value at the current moment is obtained, and abnormity identification is carried out; and for an existing abnormal condition, making a corresponding adjustment strategy to adjust each abnormal feature.

The invention relates to the technical field of aluminum decorative strip coating, and discloses an aluminum decorative strip color coating optimization system based on automatic control, which comprises a material pretreatment layer, a coating control layer and a quality detection layer. The material pretreatment layer is used for treating the surface of the aluminum decorative strip through surface cleaning, base material activation, roughness detection and adhesive force test; the coating control layer realizes coating control by utilizing a color blending unit, a spraying robot cluster, a dynamic temperature control module and a distributed controller in combination with a real-time color matching algorithm and a self-adaptive path planning mechanism; and the quality detection layer adopts an image analysis technology and a deep learning algorithm to construct a coating quality feature model, and color difference detection, defect positioning and process parameter compensation decision are realized. According to the system, automation, precision and intellectualization of the aluminum decoration strip coating process are achieved, the coating quality and the production efficiency are improved, and the system is suitable for the field of aluminum decoration strip color coating.

The invention provides a valve electrostatic spraying method and system.The method comprises the steps that firstly, a valve channel is sealed through a tool; 2, the valve to be sprayed is subjected to surface treatment; 3, a coating is prepared, and spraying parameters are determined; 4, electrostatic spraying of the valve is conducted according to the spraying parameters; and 5, after spraying is completed, curing treatment is conducted on the coating. According to the electrostatic spraying method and system for the valve, the requirement limitation of a sealing piece of a soft sealing valve on the temperature is considered, a valve channel is sealed through a tool, then the electrostatic spraying technology is introduced to replace traditional paint spraying, the adhesive strength of a coating on the surface of the valve is improved, and the salt mist resistance of the surface of the valve is provided for an outlet valve; and the protection time of the surface of the valve is greatly prolonged.

The invention relates to the technical field related to intelligent production control, in particular to a powder spraying method and system for the surface of a slender pipe and a medium, and the method comprises the steps that the preprocessed slender pipe is placed on a workbench containing multiple assemblies, electrostatic spraying is conducted through a spray gun, powder feeding adjustment is conducted, the angle of a flow guide groove is dynamically adjusted according to parameter combination, and spraying uniformity is controlled in combination with rotating speed induction. The technical problems that dynamic parameter matching mechanisms for different pipe diameters and wall thicknesses are lacked, airflow changes in the inner space of a slender pipe are difficult to cope with, and uneven distribution of powder in the pipe is likely to be caused are solved, the coating thickness deviation is controlled by associating a spray gun mechanism with a pipe rotating assembly, and the spiral angle of a flow guide groove is dynamically adjusted along with friction torque; and the piezoelectric centrifugal switch is used for detecting the rotating speed fluctuation in real time, the spray gun displacement compensation and the powder feeding amount adjustment are automatically triggered to enable the powder to be distributed in the pipe, and the machining efficiency is improved on the basis that the powder spraying quality of the surface of the long and thin pipe is guaranteed.

The invention discloses a hanging tool, hanging tool cleaning equipment and a working method of the hanging tool cleaning equipment, and relates to the technical field of metal surface coating processes and coating waste paint removal. According to the hanger, the conductive metal tube is coated with the fluorine-containing composite material (such as PFA and FEP), so that a low-friction, high-temperature-resistant and corrosion-resistant composite structure is formed, and the powder adsorption rate is remarkably reduced. Due to the design of the cross section and the selection of materials, the binding force of powder and the hanging tool is reduced due to a special cavity between the paint layer and the hanging tool, so that the difficulty of paint layer separation is reduced. A hollow gas guide channel and a T-shaped gas guide groove are formed in the self-cleaning device, and the self-cleaning function is achieved through gas purging. The matched powder separation equipment utilizes a gas generator and a powder-gas separation device, negative pressure convection is formed in a sealed cavity, residual powder on the surface of the hanger is efficiently removed, and energy consumption and pollution of a traditional paint removal process are avoided. The powder adsorption amount is reduced, the hanger turnover and maintenance cost is reduced, the production efficiency is improved, and environmental protection and economical efficiency are both considered.

The invention relates to a device (11) for coating a hollow fiber-based body (17) with a barrier layer, comprising an electrically conductive mould (13) having a first port for receiving the body (17) and comprising a spray gun (15) having a second port, the spray gun (15) being insertable into the body (17) and a polymer powder being insertable into the body (17) by means of the spray gun. A power source may be connected to the first port and the second port so that a voltage may be effected between the mold (13) and the lance (15). An electrically conductive and compressible compensation element (19) is arranged on the inner side of the mold.

The invention relates to a counter-ion adsorption high-voltage electrostatic spraying device and application thereof to preparation of a food sugar coating, and belongs to the technical field of equipment machinery and food processing. The device comprises a material conveying system, a high-voltage electrostatic spraying system, a sugar liquid supply system, a gas supply system, a sugar liquid recovery system, a microwave vacuum drying system and a control cabinet, the sugar liquid supply system and the gas supply system are both connected with the high-voltage electrostatic spraying system, the material conveying system is arranged below the high-voltage electrostatic spraying system, the material conveying system is connected with the microwave vacuum drying system, and the sugar liquid recovery system is further arranged below the material conveying system; the above systems are all controlled by a control cabinet. Through pulse switching of a high-voltage electrostatic field and a sugar liquid material, counter-ion charge accumulation of sprayed sugar liquid is realized, namely, positive charge sugar liquid (chitosan and the like) and negative charge sugar liquid (Arabic gum, carrageenan and the like) are alternately sprayed under the high-voltage electrostatic field, so that electrostatic adsorption and directional deposition of the sugar liquid on the surface of food are realized.

The utility model belongs to the technical field of spraying chambers, and discloses a spraying chamber for electrostatic spraying, which comprises a main machine body, a mounting frame is mounted in the main machine body, an electric control push rod is mounted in the mounting frame, and a push plate is mounted at one end of the electric control push rod; by controlling the electric control push rod, the electric control push rod drives the push plate to move, the push plate drives the connecting rod to move, the connecting rod drives the sliding block to move, the sliding block drives the cleaning brush to move, the cleaning brush is attached to the observation window, meanwhile, the push plate drives the mounting sleeve to move, and the mounting sleeve drives the mounting frame to move. And then a second driving motor is started, the output end of the second driving motor drives a rotating disc to rotate, the rotating disc drives a fixing block to rotate, the fixing block drives a fixing sleeve to move, then a cleaning brush is driven to move, and the cleaning brush can brush away dust on the observation window.

The purpose of the present invention is to provide a hopper for washing a coating machine, the hopper being capable of reliably separating air from other components in waste paint and discharging only the air without leakage of waste liquid to the outside. A hopper 21 for washing a coating machine according to the present invention includes a cylindrical body 46 that has an opening 46c at an upper end thereof and an upper lid 24 that covers the opening 46c. The upper lid 24 has an insertion hole 22 through which a rotary atomizing head 30 that is rotatably provided in a coating machine 4 can be inserted into the cylindrical body 46. The hopper 21 further includes a tank-like member 23 outside the cylindrical body 46. The tank-like member 23 has: a cylindrical outer wall portion 41 in which an exhaust hole 43 is formed at an upper section thereof; and a bottom portion 42 an inner surface of which is curved inward. A baffle plate 44 for restricting crawling up of waste paint ejected from the rotary atomizing head 30 is made to protrude from a lower inner surface of the outer wall portion 41 all around the inner surface. Selected drawing: FIG. 2

The invention relates to the technical field of industrial coating, and discloses a remote management control method for electrostatic powder spraying equipment, which comprises the following steps: connecting the electrostatic powder spraying equipment to a remote control center, and carrying out initialization setting; a sensor is used for collecting operation data of the equipment in real time and transmitting the data to a remote control center; optimizing spraying parameters according to preset spraying process requirements and data acquired in real time; performing real-time analysis on the equipment operation data, detecting abnormal data, and giving an alarm when an abnormality is found; by adjusting the speed and the pressure of the powder conveying system, the conveying amount of the powder is matched with the spraying task requirement; the equipment is operated and monitored in real time through the remote terminal, and simultaneous operation and authority management of multiple users are supported. By means of the method, efficient management and accurate control over the electrostatic powder spraying equipment can be achieved, the spraying efficiency and quality are improved, and the labor cost and resource waste are reduced.

The invention discloses a low-residue electrostatic powder automatic spraying system for a medical equipment structural part, and relates to the technical field of electrostatic spraying equipment. The system comprises a machining platform and a spraying chamber, a U-shaped communicating opening and a glass window are arranged in the middle section of the spraying chamber, and a hoisting conveying assembly, a spraying pretreatment assembly, an electrostatic spraying assembly, a spraying aftertreatment assembly and a hot air drying assembly are integrated in the spraying chamber; the hoisting conveying assembly achieves automatic transfer and posture adjustment of the structural parts through a driving rotating roller and a steering driving motor. The electrostatic spraying assembly adopts three symmetrical swinging spraying arms, and is matched with rotation of a rotating spraying box and movement of a lifting spraying seat to realize all-directional dead-corner-free spraying; a spraying and rolling brush composite cleaning process is adopted in pretreatment, and infrared curing and hot air drying are combined in aftertreatment. The system is high in integration degree, the spraying quality and the operation efficiency can be remarkably improved, the field occupancy rate is reduced, and the system is suitable for large-scale spraying operation of medical equipment structural parts.

The invention provides a pipeline electric arc spraying robot. The pipeline electric arc spraying robot comprises a machine shell, a walking supporting mechanism, a spraying assembly, a reducing mechanism and a driving mechanism. The spraying assembly is arranged at the rear end of the machine shell and used for forming a metal coating on the inner wall of the pipeline through electric arc spraying. The walking supporting mechanism comprises three sets of walking supporting assemblies which are evenly distributed on the periphery of the machine shell at 120-degree intervals. The diameter changing mechanism comprises three sets of self-adaptive diameter changing assemblies which correspond to the three sets of walking supporting assemblies one to one and are evenly arranged, each set of self-adaptive diameter changing assembly is connected with the corresponding set of walking supporting assembly, and the driving mechanism is installed in the machine shell and connected with the diameter changing mechanism. The reducing mechanism can be controlled by the driving mechanism to drive the three sets of walking supporting assemblies to move in the radial direction relative to the machine shell so as to adapt to the change of the pipe diameter of the pipeline, and each set of self-adaptive reducing assembly comprises a first reducing assembly and a second reducing assembly. Through coordination and cooperation of an active mode and a passive mode of the reducing mechanism, good pipeline self-adaptive capacity is achieved.

The utility model belongs to the technical field of electrostatic powder spraying, and particularly relates to an electrostatic powder spraying device. Comprising a cleaning box and a spraying box and further comprises a conveying rail, and the conveying rail sequentially penetrates through the cleaning box and the spraying box; the first sliding block is movably arranged on the conveying rail; the first supporting frame is fixedly arranged on the first sliding block; the air pressure telescopic columns are symmetrically arranged on the first supporting frame, and the output ends of the two air pressure telescopic columns are symmetrically arranged; the cleaning assembly is arranged in the cleaning box; and the spraying assembly is arranged in the spraying box. The pneumatic telescopic column hangs an object through the output end, the conveying rail drives the object to enter the cleaning box, the cleaning assembly cleans the surface of the object, the conveying rail drives the object to enter the spraying box after cleaning is completed, and the spraying assembly conducts electrostatic powder spraying on the object. Dust and stains on the surface of an object are cleaned, and electrostatic powder attachment is better achieved.

A process and spraying equipment for arc spraying carbon steel pipes. The process includes the following steps: S1: installing a raw metal wire(13) on a wire feeder(12), adjusting the wire feeding voltage according to the required thickness of spraying, and adjusting the spraying current according to the material of the raw metal wire(13); S2: spraying inner and outer walls of the pipe through an inner wall spray gun(14) and an outer wall spray gun(16); S3: after the pipe being sprayed, cooling it naturally to room temperature; S4: putting the cooled pipe into a heating furnace, adjusting the heating temperature according to the required surface alloy thickness, and cooling it in the furnace or natural cooling outside the furnace after the insulation is completed; meanwhile, the surface alloy layer is formed on the inner and / or outer wall of the carbon steel pipe; S5: after the pipe being cooled to room temperature, using a medium frequency heat treatment equipment to heat-treat the pipe through the heat treatment process.

The invention discloses an all-dimensional spraying device for automobile special-shaped parts, and relates to the field of spraying equipment.The all-dimensional spraying device comprises a spraying workbench, a multi-angle adjusting mechanism, a plate mold and a spraying mechanism, the multi-angle adjusting mechanism, the plate mold and the spraying mechanism are installed on the spraying workbench, and the multi-angle adjusting mechanism comprises a transverse deflection plate, a longitudinal deflection plate and a negative pressure tool assembly; the transverse deflection plate is rotationally installed on the spraying workbench, the longitudinal deflection plate is rotationally installed on the transverse deflection plate, the deflection axis of the transverse deflection plate is perpendicular to the deflection axis of the longitudinal deflection plate, the negative pressure tool assembly comprises a plurality of negative pressure columns, and the negative pressure columns are sleeved with the plate molds. The overall dimension of the plate mold is matched with the overall dimension of a to-be-sprayed plate, the to-be-sprayed plate is attached to the plate mold, a plurality of heating cavities are independently formed in the negative pressure column tool and the plate mold, the spraying position of the plate always tends to be in a horizontal state, and the spraying position of the to-be-sprayed plate is in a synchronous curing mode. And the problem of self-flowing of the coating due to self gravity is avoided.

The invention relates to the technical field of fertilizer manufacturing, and discloses a high-efficiency fertilizer coating machine which comprises a base and further comprises a fixed cylinder connected to the left side of the top of the base, a fixed plate connected to the right side of the top of the base, two ends of a roller are rotationally connected with the fixed cylinder and the fixed plate respectively, and a coating mechanism is arranged on the roller. The impurity removing mechanism is arranged on the left side of the roller and used for removing impurities of the fertilizer entering the roller, and the screening mechanism is arranged on the right side of the roller. Through the synergistic effect of the electrostatic assembly and the atomizing spray pipe, coating agent fog drops are negatively charged, fertilizer particles are positively charged after being rubbed by a friction block, and dust particles are adsorbed by utilizing Coulomb force, so that dust dissipation is reduced, and the health of operators is guaranteed; coulomb force is utilized to break through the limitation of mechanical turning, so that coated liquid drops are directionally adsorbed to the surfaces of particles, and the coating effect of the fertilizer is improved.

A nozzle assembly for a painting system including an outer wall, an inner wall and a pair of electrodes. The inner wall defines a paint passage through which paint is dispensed. The inner wall is spaced from the outer wall to define a fluid passage between an outer surface of the inner wall and an inner surface of the outer wall. The pair of electrodes extend circumferentially around an outer surface of the inner wall. The pair of electrodes are configured to be electrically connected to a power source. The fluid passage is configured to receive a fluid. Upon supplying power to the pair of electrodes, water droplets are separated from the fluid in the fluid passage and pass through the inner wall to coat an inner surface of the inner wall to facilitate movement of the paint through the paint passage.

The invention relates to the technical field of sheet metal part machining, and discloses a sheet metal part spraying device which comprises a spraying chamber. The conveying mechanism is used for installing the sheet metal part and driving the sheet metal part to pass through the spraying chamber; the position adjusting mechanism is located outside the spraying chamber and comprises a base, a support and a sliding seat; the support is adjusted and moved on the base in the direction perpendicular to the conveying direction of the conveying mechanism, and the sliding base is adjusted and moved on the support in the vertical direction. The spraying mechanism comprises a connecting frame and a spraying head; the connecting frame is connected to the sliding seat, the spray head is installed on the connecting frame, and meanwhile the spray head penetrates through the side wall of the spraying chamber to enter the spraying chamber; a moving groove allowing the connecting frame to penetrate through and move up and down is formed in the side wall of the spraying chamber in the vertical direction. The spraying device can improve the spraying quality of the sheet metal part.

The invention is suitable for the technical field of roller oiling, and provides a roller online electrostatic oiling device and an oiling method thereof.The roller online electrostatic oiling device comprises an adjusting surrounding assembly and an intermittent shielding assembly; the adjusting and surrounding assembly comprises an adjusting frame, a lifting motor, a lifting shaft, a lifting block, a lifting plate, a surrounding piece, a supporting rod, a movable block and an atomizing spray gun. The intermittent shielding assembly comprises a vertical plate, an annular sliding rail, an electric ring block, a triangular plate, a driving motor, a driving gear, a movable plate, gear teeth and a shielding plate. When a movable plate rotates to a triangular area of a triangular plate, one movable pin continues to slide along the interior of a triangular groove and extrudes a corresponding long strip to extrude the long strip back into a corresponding cutting groove, so that a corresponding short block is extruded out of the corresponding cutting groove, the other movable pin is pushed into an annular groove, the movable plate is turned over, and the short block is extruded out of the annular groove. And the process is repeated, so that the purpose of coating the two surfaces of the baffle plate with the lubricating oil mist is achieved, and part of the lubricating oil mist is coated on the surface of the baffle plate.

The invention relates to a periodic voltage controlled composite yarn space dyeing device and a space dyeing method, the composite space-dyed yarn is realized based on an array spinning dyeing technology, and intermittent generation of a color nano array is controlled through periodically changing high-voltage static electricity to form fiber strips, rough yarns and yarns with segmented colors. According to the yarn space dyeing device, dye bath and large-scale dyeing equipment do not need to be used, and energy consumption and water consumption are lower; according to the space dyeing method, the process batch is convenient to replace, various samples can be prepared by designing a drawing process, and the products are suitable for proofing and customizing personalized fabrics.

The invention discloses an all-solid-state battery cell and a dry-method electrostatic spraying nozzle and method for preparing the all-solid-state battery cell, the nozzle structure is suitable for a powder spraying technology, the nozzle structure comprises an inner layer structure, a middle layer structure and an outer layer structure, the inner layer and the outer layer can be electrode active material channels, and the middle layer can be a coating layer channel of multiple materials such as a carbon conductive agent, a solid electrolyte and a binder; wherein the middle-layer powder can realize quantitative and uniform coating of the inner-layer electrode active material and the outer-layer electrode active material by virtue of electrostatic adhesion and control of a flow rate ratio, a good electron and ion transport channel is constructed, and the electrochemical performance of the solid-state battery is improved. A solvent is not needed in the preparation process of the all-solid-state battery cell, the design of the nozzle structure can be compatible with integrated preparation of a current collector, an electrode and an electrolyte membrane at the same time, the preparation process is greatly simplified, and the production cost is reduced.

An electrostatic coating system including of a novel technique of height adjustment through pressure sensing and feedback mechanism in twin-phase air-assisted and forced-liquid flow based electrostatic nozzle(s). A variable height electrostatic edible coating system provides uniform and efficient coating to ensure shelf-life extension, improved nutritional value and enhanced sensory attribute.

An electrostatic atomizer electrostatically atomizes a fluid into a charged spray, wherein the charged spray includes a plurality of charged droplets. The electrostatic atomizer includes a chamber forming an inlet and an exit aperture, wherein the chamber is configured for fluid to flow into the chamber from the inlet and to flow out of the chamber from the aperture. An emitter electrode is in liquid contact with the fluid in the chamber and injects an electrical charge into the fluid in the chamber. An impedance circuit is coupled to the chamber and configured to obtain a voltage difference between the emitter electrode and the exit aperture, wherein the voltage difference is at least a minimum voltage threshold.

The invention discloses a high-rise building outer wall coating spraying device which comprises an unmanned aerial vehicle and a coating supply assembly. The coating supply assembly comprises a stirrer pot and a high-pressure plunger pump; the high-pressure plunger pump is located in the stirrer pot, the unmanned aerial vehicle is connected with an electrostatic spraying gun, and an output port of the high-pressure plunger pump is connected with the electrostatic spraying gun through a coating output hose. The coating feeding assembly further comprises a stirring frame, the stirring frame is arranged in the stirrer pot, the upper end face of the stirrer pot is connected with a stirring driving motor, and the output end of the stirring driving motor penetrates through the stirrer pot to be connected with the stirring frame. According to the high-rise building outer wall coating spraying device and method, the existing defects are overcome, and the outer wall coating spraying efficiency is improved.

Described are an apparatus for generating and collecting nanospray reactive droplets and a method for analyzing a protein digestion. The apparatus includes a capillary, counter electrode, collection vessel, electrostatic lenses, and voltage control module. The capillary receives a mixture that includes a protein and an enzyme and has an outlet disposed in the aperture to dispense the mixture. The collection vessel has a concave surface to receive a nanospray plume emitted from the capillary outlet. The counter electrode and electrostatic lenses are disposed along a nanospray path defined between the capillary outlet and the collection vessel. Each electrostatic lens is formed of an electrically conductive plate having an aperture therein to pass a nanospray reactive plume. The voltage control module is in electrical communication with and is configured to independently control the voltage of the capillary, the counter electrode, the collection vessel and each of the electrostatic lenses.

The invention provides an infrared temperature control electrostatic spraying system and method. The system comprises a mechanical execution module, an infrared temperature control module, an electrostatic spraying module, a feeding module and a control module. The electrostatic spraying module comprises a high-voltage electrostatic generator, an electrostatic spray gun and an atomization adjusting unit; the infrared temperature control module comprises an infrared temperature measurement sensor and a temperature data processing unit. The infrared temperature measuring sensor and the electrostatic spray gun move synchronously, the surface temperature of a workpiece is collected in real time, and the control module dynamically adjusts the output voltage of the high-voltage electrostatic generator, parameters of the atomization adjusting unit and the moving speed of the mechanical arm after receiving temperature data. According to the scheme, the problem of parameter adaptation imbalance caused by temperature difference in traditional spraying is effectively solved, the coating uniformity is greatly improved, stable spraying quality is guaranteed, and the production qualification rate is increased.

The invention relates to an apparatus (100) for electrostatically applying a liquid, atomised coating agent (1) to a substrate (110), in particular a metal strip or sheet metal strip to be wound as a coil, which substrate can be moved in a feed direction F, said apparatus comprising: a delivery device (2) or pump for the coating agent (1) that is provided in a tank or otherwise; a control unit (3) for the application process; a carrier (5) for holding an outlet device (2) in the form of a nozzle bar (50), wherein the outlet device (2) is arranged at least above, preferably above and below, the substrate (110) at a distance therefrom and is provided with at least one chamber (51, 52) and a plurality of outlets, slots or nozzle openings (54) directed towards the substrate (110), wherein the nozzle bar (50) has at least two chambers (51, 52) which are hydraulically separated from one another and each have separate feed lines (41, 42) for selectively different or the same types of coating agent (1) in the chambers (51, 52), and dedicated and integrated switching valves (60) for opening / closing the chambers (51, 52) and connections to the nozzle openings (54) or a group of nozzle openings (54) are provided in the nozzle bar (50) for each of the chambers (51, 52).