Electrostatic spraying device capable of synchronously driving multiple groups of rotary cups and supplying materials at constant pressure

Abstract

The invention discloses an electrostatic spraying device capable of synchronously driving multiple groups of rotary cups and supplying materials at constant pressure, and belongs to the technical field of electrostatic spraying, the device comprises mounting bases which are symmetrically distributed, three groups of vertical guide grooves are formed in the side wall of each mounting base, and top, middle and bottom rotary cup atomizing units are assembled in the grooves through sliding blocks; the driving mechanism drives the three groups of rotating cups to reciprocate up and down in sequence through the synchronous belt transmission device, the movement range is strictly limited in the upper, middle and lower 1 / 3 areas of a workpiece, and the spraying area of the middle rotating cup extends to the adjacent area to realize overlapping coverage; the cavity-divided pressure balance module independently adjusts the pressure of each rotary cup branch through an elastic diaphragm, so that the feeding stability is ensured; the rotary cup atomization unit is provided with an electric push rod and a deflection sleeve, supports dynamic adjustment of an inclination angle (in a range of + / -15 degrees), and is adaptive to spraying of a curved surface workpiece; and the non-attached coating is subjected to vortex separation and magnetic filtration recycling of the negative pressure generator.

Description

Technical Field

[0001] The present invention relates to the technical field of electrostatic spraying, and particularly to an electrostatic spraying device for synchronous driving of multiple rotary cups and constant-pressure feeding, which is applicable to the automated spraying process on the surface of workpieces. Background Art

[0002] Currently, the existing electrostatic spraying devices still have the following technical bottlenecks in the synchronous driving of multiple rotary cups and constant-pressure feeding: 1. Low synchronous driving accuracy: Traditional driving of multiple rotary cups mostly uses a single motor combined with chain or gear transmission. Due to mechanical clearances and load differences, it is easy to cause phase shift of the rotary cup movement, and the thickness fluctuation in the spraying overlap area is obvious. In addition, the chain drive is prone to tension relaxation due to wear after long-term use, and frequent manual adjustment is required, seriously affecting production continuity.

[0003] 2. Uneven distribution of feeding pressure: The multi-rotary-cup feeding system usually adopts a single-pump multi-branch design, and the pressure between branches is greatly affected by factors such as pipeline length and the number of elbows. For example, when the inlet pressure difference of three rotary cups is too large, the deviation of the coating flow rate exceeds the reasonable range, and streaky unevenness is likely to appear on the spraying surface. Although the prior art attempts to manually adjust the pressure through throttle valves, it cannot dynamically respond to the change in the height of the rotary cup (for example, a higher pressure is required at a high position to overcome gravity), resulting in fluctuations in the coating thickness with the position of the rotary cup.

[0004] 3. Single spraying coverage strategy: Traditional rotary cup layouts are mostly at fixed heights or simple alternating movements, making it difficult to achieve segmented and superimposed spraying of complex workpieces. For example, for continuously conveyed flat workpieces, the existing devices only cover the surface through up-and-down reciprocating movements, and it is easy to have missed spraying in the edge areas due to the limitation of the coating scattering angle; for curved workpieces (such as car bumpers), the fixed inclination angle of the rotary cup results in too thin a coating on the concave surface. In the multi-rotary-cup misaligned layout scheme in the prior art, since no regional superposition mechanism is designed, the middle rotary cup only covers an independent area, and there is still a problem of sudden thickness change at the boundary.

[0005] 4. Serious coating waste: The recovery technology for unadhered coatings is less efficient. In traditional negative-pressure recovery devices, due to uneven air flow distribution, the sedimentation of coating particles is insufficient, and the recovery rate is less than 70%. Some solutions adopt multi-stage filtration technology, but the filter screens are prone to clogging and the maintenance cost is high.

[0006] 5. Poor maintenance convenience: The disassembly and assembly of the rotary cup atomizer usually require the disassembly of multiple groups of bolts and pipeline interfaces, with a relatively long average replacement time. Moreover, improper operation is likely to cause seal failure or pipeline misalignment, further increasing the downtime.

[0007] In view of the above problems, there is an urgent need for an electrostatic spraying device that can achieve high-precision synchronous driving of multiple rotary cups, adaptive pressure distribution, and intelligent coverage of the spraying area, while significantly improving the paint utilization rate and optimizing the maintainability of the equipment to meet the urgent needs for high efficiency, uniformity, and energy conservation in industrial spraying scenarios. Summary of the Invention

[0008] 1. Technical problems to be solved: In view of the problems existing in the prior art, the present invention aims to solve the problems of poor synchronization of multiple rotary cups, large fluctuations in feeding pressure, and uneven spraying coverage in the prior art, and provides an electrostatic spraying device that can achieve segmented spraying, pressure self-balancing, and uniform coverage.

[0009] 2. Technical solutions: To solve the above problems, the present invention adopts the following technical solutions.

[0010] An electrostatic spraying device for synchronous driving of multiple rotary cups and constant-pressure feeding, including two symmetrically distributed mounting bases, the side wall of the mounting base is provided with a maintenance door, and three vertically distributed rectangular guide grooves are opened on the adjacent side walls of the two mounting bases; A rotary cup atomization unit is slidably assembled in the rectangular guide groove, and a driving mechanism for driving the three rotary cup atomization units to synchronously reciprocate up and down is arranged inside the mounting base; The driving mechanism includes a reciprocating lifting assembly arranged inside the mounting base, a synchronous belt transmission device is connected to the rear side of the reciprocating lifting assembly, a slider is slidably connected in the rectangular guide groove, one end of the slider is fixedly connected to the rotary cup atomization unit, the other end is connected to the moving part of the reciprocating lifting assembly, and a set of disc springs is arranged between the slider and the upper and lower walls of the rectangular guide groove; A split-chamber pressure balance module is arranged on the top of the mounting base, and the split-chamber pressure balance module is communicated with the rotary cup atomization unit through a pipeline; The rotary cup atomization units are distributed along the upper, middle, and lower parts of the mounting base, and the spraying area of the middle rotary cup atomization unit partially overlaps with the spraying areas of the upper and lower rotary cup atomization units; Negative pressure generators are arranged at the bottom of the adjacent sides of the two mounting bases, a negative pressure chamber with a spiral deflector is arranged inside the negative pressure generator, the discharge port is connected to a magnetic filter, and the magnetic filter is communicated with the feeding system.

[0011] Further improvement lies in that: the reciprocating lifting assembly includes three connecting bases arranged inside the mounting base, the connecting bases are located at the rear side of the rectangular guide groove, and the upper and lower ends are fixedly connected to the mounting base through connecting plates; A first transmission gear is arranged at the center of the connecting base, second transmission gears meshing with the first transmission gear are arranged on both sides, and sector gears arranged in the same direction are fixedly connected to the front ends of the second transmission gears; A slide rail is provided inside the connecting plate. The slide rail is slidably connected to a rack. The rack meshes with a sector gear and is fixedly connected to a slider at the front end.

[0012] A further improvement lies in that: the synchronous belt transmission device includes a motor substrate fixedly connected to the inside of the mounting base. A reduction motor is provided on the motor substrate. Double-layer synchronous pulleys are provided at the rear ends of the connection bases corresponding to the middle and bottom sliders. The double-layer synchronous pulleys are connected to the reduction motor through a first synchronous belt, and adjacent double-layer synchronous pulleys are linked through a second synchronous belt. A single-layer synchronous pulley is provided at the rear end of the connection base corresponding to the top slider. The single-layer synchronous pulley is connected to the middle double-layer synchronous pulley through a third synchronous belt.

[0013] A further improvement lies in that: the spinning cup atomization unit includes a bracket fixedly connected to the slider. A driving motor is provided inside the bracket, and the output end of the driving motor is connected to a turntable. Three elastic telescopic mechanisms and an electric push rod are evenly distributed on the end face of the turntable. The telescopic ends of the elastic telescopic mechanisms and the electric push rod are all hinged to a deflection sleeve. A spinning cup atomizer is provided at the front end of the deflection sleeve. The rear end of the spinning cup atomizer is hinged to the deflection sleeve through a T-shaped positioning plate and is connected to the bracket through a spherical hinge connecting rod at the bottom.

[0014] A further improvement lies in that: the elastic telescopic mechanism includes a sleeve fixedly connected to the turntable. A movable rod and a return spring are provided inside the sleeve, and a first spherical hinge is provided at the end of the movable rod. The spherical hinge connecting rod includes a telescopic rod and second spherical hinges at both ends, which are respectively hinged to the spinning cup atomizer and the bracket.

[0015] A further improvement lies in that: the cavity-divided pressure balance module includes a base provided on the top of the mounting base. A constant pressure tank with three chambers is provided on the base. An outlet with an elastic diaphragm is provided at the front end of each chamber. A proportional valve and a micro flow meter are provided at the outlet, and the three groups of spinning cup atomization units are respectively connected through pipelines. A branch air path is provided at the top of the constant pressure tank, and the top of the branch air path is communicated with the main pump.

[0016] A further improvement lies in that: the spinning cup atomizer includes a housing. First through grooves are symmetrically opened on the left and right sides of the housing, and a nozzle is provided inside. An atomizer is coaxially inserted inside the nozzle. Three independent pipelines are embedded on the left and right sides and the upper side wall of the nozzle. One end of the pipeline penetrates through the housing and is communicated with the cavity-divided pressure balance module, and the other end extends to the atomization chamber inlet of the atomizer. A limiting clip is rotatably connected to the rear side of the nozzle. The limiting clip is located at the upper left side of the atomizer. An adjusting bolt is provided on the rear side of the nozzle corresponding to the lower right side of the atomizer. When the limiting clip rotates to the horizontal position, after the adjusting bolt is tightened, it presses the front end of the limiting clip to make it abut against the outer wall of the atomizer, restricting the axial movement of the atomizer.

[0017] A cover plate is detachably connected to the top of the housing. A second through groove aligned with the outlet of the atomizer is provided in the center of the cover plate.

[0018] A further improvement lies in that: the stiffness coefficient of the disc spring group changes non-linearly with the compression amount, and the ratio of its maximum compression stroke to the height of the rectangular guide groove is 1:3.5.

[0019] A further improvement lies in that: the tooth pitch of the first synchronous belt, the second synchronous belt and the third synchronous belt is equal, and the surface of the synchronous belt is coated with a wear-resistant polyurethane coating.

[0020] 3. Beneficial effects: Adopting the technical solution provided by the present invention, compared with the prior art, it has the following beneficial effects: (1) The spraying uniformity is significantly improved: Through the segmented spraying of three sets of spinning cups and the superimposed coverage design of the middle spinning cup, the problem of boundary missing spraying in traditional single spraying is effectively eliminated, and the uniform distribution of the coating thickness is realized.

[0021] (2) The stability of the feeding pressure is enhanced: The cavity-divided pressure balance module combines an elastic diaphragm and a proportional valve to ensure the self-adaptive balance of the feeding pressure in multiple branches, reducing the pressure fluctuation caused by the change of the position of the spinning cup.

[0022] (3) The reliability of the synchronous drive is optimized: The synchronous belt drive device cooperates with the non-linear stiffness characteristics of the disc spring group to significantly suppress the transmission vibration.

[0023] (4) The utilization rate of the coating is increased: The eddy current separation and magnetic filtration technology of the negative pressure generator effectively recover the unadhered coating, greatly reducing the waste of the coating.

[0024] (5) The applicability of the equipment is expanded: The deflection sleeve and ball hinge connecting rod design of the spinning cup atomization unit support the dynamic adjustment of the inclination angle, adapt to the spraying requirements of plane and complex curved surface workpieces, and improve the process compatibility.

[0025] It should be noted that the structures not introduced in the present invention are the same as the prior art or can be realized by the prior art because they do not involve the design key points and improvement directions of the present invention, and will not be elaborated here. Brief description of the drawings

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the drive mechanism of the present invention; Figure 3 Schematic structural diagram of the reciprocating lifting assembly of the present invention; Figure 4 Schematic diagram of the transmission principle of the synchronous belt transmission device of the present invention; Figure 5 Schematic structural diagram of the cup atomization unit of the present invention; Figure 6 Schematic structural diagram of the cup atomizer after angle deflection adjustment of the present invention; Figure 7 Exploded structural diagram of the cup atomizer of the present invention; Figure 8 Schematic structural diagram of the cavity-divided pressure balance module of the present invention.

[0027] Description of the reference numerals in the figure: 1. Installation base; 2. Inspection door; 3. Rectangular guide groove; 41. Reciprocating lifting assembly; 411. Connection base; 412. Connection plate; 413. Slide rail; 414. First transmission gear; 415. Second transmission gear; 416. Sector gear; 417. Rack; 42. Synchronous belt transmission device; 421. Motor base plate; 422. Reducing motor; 423. Double-layer synchronous pulley; 424. First synchronous belt; 425. Second synchronous belt; 426. Single-layer synchronous pulley; 427. Third synchronous belt; 43. Slide block; 44. Disc spring group; 5. Cup atomization unit; 51. Bracket; 52. Driving motor; 53. Turntable; 54. Elastic telescopic mechanism; 541. Sleeve; 542. Movable rod; 543. Return spring; 544. First ball hinge; 55. Electric push rod; 56. Deflection sleeve; 57. Cup atomizer; 571. Housing; 572. First through groove; 573. Nozzle; 574. Atomizer; 575. Pipeline; 576. Limit clip; 577. Adjusting bolt; 578. Cover plate; 579. Second through groove; 58. T-shaped positioning plate; 59. Ball hinge connecting rod; 591. Telescopic rod; 592. Second ball hinge; 6. Cavity-divided pressure balance module; 61. Base; 62. Constant pressure tank; 63. Discharge port; 64. Proportion valve; 65. Micro flowmeter; 66. Branch air circuit; 7. Negative pressure generator. Detailed implementation manners

[0028] For the convenience of understanding the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0029] I. Component Installation and Connection (please refer to Figures 1-8 ) 1. Installation Base and Guide Groove Arrangement Fix two sets of symmetrically distributed installation bases 1 on both sides of the spraying line to ensure that the distance between the adjacent side walls thereof matches the width of the workpiece to be sprayed.

[0030] Open three sets of vertically distributed rectangular guide grooves 3 on the adjacent side walls of the installation base 1, and polish the inner surface of the grooves to reduce the frictional resistance.

[0031] 2. Assembly of the Rotary Cup Atomization Unit Assemble the rotary cup atomization unit 5 into the rectangular guide groove 3 by sliding the slider 43, and ensure that the disc spring group 44 between the slider 43 and the upper and lower walls of the guide groove is pre-compressed (the compression amount is 30% of the maximum stroke).

[0032] The top, middle, and bottom rotary cup atomization units 5 are axially staggered along the installation base 1. Among them: The spraying area of the top rotary cup covers the upper 1 / 3 of the workpiece; The spraying area of the middle rotary cup covers the middle 1 / 3 of the workpiece and extends to the lower 1 / 3 of the top area and the upper 1 / 3 of the bottom area; The spraying area of the bottom rotary cup covers the lower 1 / 3 of the workpiece.

[0033] The stiffness coefficient of the disc spring group 44 changes non-linearly exponentially with the compression amount, and its maximum compression stroke is 15 mm, and the ratio to the height (52.5 mm) of the rectangular guide groove 3 is 1:3.5.

[0034] 3. Installation of the Driving Mechanism Install the driving mechanism inside the installation base 1: Fix the connecting base 411 to the rear side of the rectangular guide groove 3 through the connecting plate 412; Install the first transmission gear 414 at the center of the connecting base 411, engage the second transmission gears 415 on both sides, and fix the sector gear 416 at the front end of the second transmission gear; Slide the rack 417 on the slide rail 413 and engage it with the sector gear 416, and fix the front end of the rack to the slider 43.

[0035] 4. Configuration of the Synchronous Belt Transmission Device Install the reduction motor 422 on the motor substrate 421, and connect the reduction motor to the double-layer synchronous pulleys 423 in the middle and at the bottom through the first synchronous belt 424; The adjacent double-layer synchronous pulleys 423 are linked through the second synchronous belt 425; The single-layer synchronous pulley 426 connected to the rear end of the top connection base 411 is connected to the middle double-layer synchronous pulley 423 through the third synchronous belt 427, forming a synchronous drive link for the three groups of rotary cups; The surface of the synchronous belt is covered with a wear-resistant polyurethane coating with a thickness of 0.5 mm and a Shore hardness of 80A.

[0036] 5. Connection of the cavity-dividing pressure balance module Install the constant-pressure tank 62 with three chambers on the top base 61 of the installation base 1. The discharge port 63 of each chamber is connected to the corresponding rotary cup atomization unit 5 through a pipeline; Install a proportional valve 64 and a micro flowmeter 65 at the discharge port 63, and connect the constant-pressure tank 62 to the main feed pump through a branch air circuit 66.

[0037] 6. Installation of the negative pressure generator Install the negative pressure generator 7 at the bottom of the adjacent side of the installation base 1. A spiral deflector is arranged in its internal negative pressure cavity. The discharge port is connected to a magnetic filter and is connected to the feeding system through a recovery pipeline.

[0038] II. Operation steps and process 1. Start of the drive mechanism Start the reduction motor 422, and drive the three groups of rotary cup atomization units 5 to move up and down reciprocally through the synchronous belt transmission device 42.

[0039] The top rotary cup is driven by the single-layer synchronous pulley 426 through the third synchronous belt 427; The middle and bottom rotary cups are linked through the double-layer synchronous pulleys 423 and the second synchronous belt 425.

[0040] 2. Constant-pressure feeding adjustment The main pump transports the coating to the total chamber of the constant-pressure tank 62, and the elastic diaphragm automatically adjusts the chamber pressure according to the flow rate of each rotary cup; The micro flowmeter 65 monitors the flow rate of each branch in real time, and feeds back to the controller to dynamically adjust the opening of the proportional valve 64 to ensure the balance of the outlet pressure of the three groups of rotary cups; Among them, the elastic diaphragm is made of silica gel material, and compensates for the pressure fluctuation of the branch through deformation; the proportional valve 64 adjusts the opening in real time according to the feedback signal of the micro flowmeter 65.

[0041] 3. Segmented and superimposed spraying process The first stage (top spraying): When the workpiece enters the spraying line, the top rotary cup atomization unit 5 descends from the high position to the middle-high position to spray the upper 1 / 3 area of the workpiece; the spraying range is limited to prevent the paint from scattering to non-target areas and reduce edge overspray.

[0042] The second stage (middle overlapping spraying): The workpiece is continuously conveyed to the middle area, and the middle rotary cup atomization unit 5 descends from the middle position to the middle-low position to cover the middle 1 / 3 area; Overlapping design: The spraying range of the middle rotary cup simultaneously covers the lower 1 / 3 of the top area and the upper 1 / 3 of the bottom area to fill the boundary gap between adjacent rotary cups; Eliminate the "seam" phenomenon of traditional segmented spraying to ensure smooth coating transition and uniform thickness.

[0043] The third stage (bottom spraying): When the workpiece moves to the bottom area, the bottom rotary cup atomization unit 5 rises from the low position to the middle-low position to spray the lower 1 / 3 area; accurately cover the bottom of the workpiece to avoid paint sag and accumulation caused by gravity.

[0044] At the same time, the synergistic effect of the middle overlapping spraying also has: Enhanced coating continuity: The extended spraying of the middle rotary cup on the top and bottom areas forms a 20%-30% overlapping coverage in adjacent areas, completely eliminating the risk of missed spraying; Improved uniformity: The paint particles in the overlapping area have significantly better thickness consistency due to two attachments (top rotary cup + middle rotary cup) than single spraying; Adapt to complex shapes: For the uneven surface of the workpiece, overlapping spraying can make up for the insufficient coverage caused by the limitation of the scattering angle.

[0045] 4. Dynamic adjustment of the rotary cup inclination angle (for curved workpieces and concave-convex corners) Driven by the electric push rod 55: An electric push rod 55 is installed on the turntable 53 of each rotary cup atomization unit 5, and its telescopic end is connected to the deflection sleeve 56 by a hinged manner.

[0046] The electric push rod 55 is connected to the turntable 53 through a rotary electrical connector to avoid cable entanglement, and the outlet end of the cable is on the side of the turntable 53 close to the drive motor 52.

[0047] Inclination adjustment range: The electric push rod 55 pushes the deflection sleeve 56 to move radially along the turntable 53, driving the rotary cup atomizer 57 to deflect around the hinge point of the T-shaped positioning plate 58 to achieve dynamic inclination adjustment (within the range of ±15°).

[0048] Maintain stability: The return spring 543 of the elastic telescopic mechanism 54 and the ball hinge connecting rod 59 work together to offset the spraying reaction force and ensure a constant distance between the rotary cup and the workpiece surface after the inclination adjustment.

[0049] Technical advantages and spraying effects Complex surface adaptation: For concave workpieces, increasing the tilt angle of the rotary cup can reduce the spraying dispersion angle, causing the paint to focus on the concave area; for convex workpieces, decreasing the tilt angle of the rotary cup can expand the coverage range to avoid missed spraying at the edges.

[0050] Improvement of coating uniformity: Dynamic tilt adjustment enables the paint particles to adhere vertically to the curved surface, reducing the thickness non-uniformity caused by angle deviation (the thickness fluctuation in the concave area is reduced to ±3μm).

[0051] 5. Paint recovery and recycling The unadhered paint forms a vortex through the spiral guide plate of the negative pressure generator 7, and after centrifugal separation, it enters the magnetic filter; the filtered paint returns to the feeding system, and the residual impurities are cleaned regularly.

[0052] The implementation of this electrostatic spraying device realizes efficient segmented and superimposed spraying through the following steps: First, two sets of mounting bases 1 are symmetrically fixed on both sides of the spraying line, and three groups of vertical guide grooves 3 are opened on their adjacent side walls. The top, middle, and bottom rotary cup atomization units 5 are assembled through the slider 43 and the disc spring group 44, and under the drive structure, the movement range of each rotary cup is strictly limited. The top covers the upper 1 / 3, the middle covers the middle 1 / 3 and extends to the adjacent area, and the bottom covers the lower 1 / 3; Subsequently, the synchronous belt transmission device 42 is installed, and the double-layer synchronous pulley 423 and the single-layer synchronous pulley 426 are driven by the reduction motor 422 to ensure that the three rotary cups act in the order of "top → middle → bottom"; At the same time, the cavity-divided pressure balance module 6 dynamically adjusts the pressure of each branch through the elastic diaphragm, making the flow rate of the middle rotary cup slightly higher to support superimposed spraying; Finally, when the workpiece is continuously conveyed, the top rotary cup sprays the upper section, the middle rotary cup covers the middle section and extends to fill the adjacent boundary, the bottom rotary cup completes the lower section spraying, and the unadhered paint is recycled after being recovered and filtered by the negative pressure generator 7.

[0053] The above embodiments only represent a certain implementation manner of the present invention, and its description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention; Therefore, the protection scope of the patent of the present invention shall be subject to the appended claims.

Claims

1. An electrostatic spraying device with multi-group rotary cup synchronous drive and constant pressure material supply, including two groups of symmetrically distributed mounting bases (1), characterized in that: A maintenance door (2) is provided on the side wall of the mounting base (1), and three vertically distributed rectangular guide grooves (3) are opened on the adjacent side walls of the two mounting bases (1); A rotary cup atomization unit (5) is slidably assembled in the rectangular guide groove (3), and a drive mechanism for driving the three rotary cup atomization units (5) to reciprocate synchronously up and down is provided inside the mounting base (1); The drive mechanism includes a reciprocating lifting assembly (41) provided inside the mounting base (1), a synchronous belt transmission device (42) is connected to the rear side of the reciprocating lifting assembly (41), a slider (43) is slidably connected in the rectangular guide groove (3), one end of the slider (43) is fixedly connected to the rotary cup atomization unit (5), the other end is connected to the moving part of the reciprocating lifting assembly (41), and a butterfly spring group (44) is provided between the slider (43) and the upper and lower walls of the rectangular guide groove (3); A cavity-divided pressure balance module (6) is provided on the top of the mounting base (1), and the cavity-divided pressure balance module (6) is communicated with the rotary cup atomization unit (5) through a pipeline; The rotary cup atomization units (5) are distributed along the upper, middle and lower parts of the mounting base (1), and the spraying areas of the middle rotary cup atomization units (5) partially overlap with the spraying areas of the upper and lower rotary cup atomization units (5); Negative pressure generators (7) are provided at the bottoms of the adjacent sides of the two mounting bases (1). The negative pressure generators (7) are internally provided with a negative pressure cavity with a spiral guide plate, and the discharge port is connected to a magnetic filter, and the magnetic filter is communicated with the material supply system.

2. The electrostatic spraying device with multi-group rotary cup synchronous drive and constant pressure material supply according to claim 1, characterized in that: The reciprocating lifting assembly (41) includes three connecting bases (411) provided inside the mounting base (1), the connecting bases (411) are located at the rear side of the rectangular guide groove (3), and the upper and lower ends are fixedly connected to the mounting base (1) through connecting plates (412); A first transmission gear (414) is provided at the center of the connecting base (411), and second transmission gears (415) meshing with the first transmission gear (414) are provided on both sides. The front ends of the second transmission gears (415) are fixedly connected with sector gears (416) arranged in the same direction; Sliding rails (413) are provided inside the connecting plates (412), the sliding rails (413) are slidably connected with racks (417), the racks (417) mesh with one of the sector gears (416), and the front ends are fixedly connected to the sliders (43).

3. The electrostatic spraying device for synchronous driving of multiple rotary cups and constant-pressure material supply according to claim 2, wherein: The synchronous belt transmission device (42) includes a motor base plate (421) fixedly connected to the inside of the mounting base (1), and a reduction motor (422) is provided on the motor base plate (421); Double-layer synchronous wheels (423) are provided at the rear ends of the connecting bases (411) corresponding to the middle and bottom sliders (43), the double-layer synchronous wheels (423) are connected to the reduction motor (422) through a first synchronous belt (424), and adjacent double-layer synchronous wheels (423) are linked through a second synchronous belt (425); At the rear end of the connecting base (411) corresponding to the top slider (43), a single-layer synchronous pulley (426) is provided, and the single-layer synchronous pulley (426) is connected to the middle double-layer synchronous pulley (423) through a third synchronous belt (427).

4. The electrostatic spraying device for synchronous driving of multiple rotary cups and constant-pressure material supply according to claim 1, characterized in that: The rotary cup atomization unit (5) includes a bracket (51) fixedly connected to the slider (43). A drive motor (52) is provided inside the bracket (51), and the output end of the drive motor (52) is connected to a turntable (53). On the end face of the turntable (53), three elastic telescopic mechanisms (54) and an electric push rod (55) are evenly distributed. The telescopic ends of the elastic telescopic mechanisms (54) and the electric push rod (55) are all hinged to a deflection sleeve (56), and a rotary cup atomizer (57) is provided at the front end of the deflection sleeve (56). The rear end of the rotary cup atomizer (57) is hinged to the deflection sleeve (56) through a T-shaped positioning plate (58), and the bottom is connected to the bracket (51) through a ball hinge connecting rod (59).

5. The electrostatic spraying device for synchronous driving of multiple rotary cups and constant-pressure material supply according to claim 4, wherein: The elastic telescopic mechanism (54) includes a sleeve (541) fixedly connected to the turntable (53). An activity rod (542) and a return spring (543) are provided inside the sleeve (541), and a first ball hinge (544) is provided at the end of the activity rod (542). The ball hinge connecting rod (59) includes a telescopic rod (591) and second ball hinges (592) at both ends, which are respectively hinged to the rotary cup atomizer (57) and the bracket (51).

6. The electrostatic spraying device with multi-group rotary cup synchronous drive and constant pressure material supply according to claim 1, characterized in that: The cavity-dividing pressure balance module (6) includes a base (61) provided on the top of the installation base (1), and a constant pressure tank (62) with three chambers is provided on the base (61). At the front end of each chamber, a discharge port (63) with an elastic diaphragm is provided. The discharge port (63) is provided with a proportional valve (64) and a micro flow meter (65), and is respectively connected to three groups of rotary cup atomization units (5) through pipelines. A branch air path (66) is provided at the top of the constant pressure tank (62), and the top of the branch air path (66) is communicated with the main pump.

7. The electrostatic spraying device with multi-group rotary cup synchronous drive and constant-pressure material supply according to claim 4, characterized in that: The rotary cup atomizer (57) includes a housing (571). First through grooves (572) are symmetrically opened on the left and right sides of the housing (571), and a nozzle (573) is provided inside it. An atomizer (574) is coaxially inserted inside the nozzle (573). Three independent pipelines (575) are embedded in the left and right sides and the upper side wall of the nozzle (573). One end of the pipeline (575) penetrates through the housing (571) and is communicated with the cavity-dividing pressure balance module (6), and the other end extends to the atomization chamber inlet of the atomizer (574). A limit clip (576) is rotatably connected to the rear side of the nozzle (573). The limit clip (576) is located on the upper left side of the atomizer (574). An adjusting bolt (577) is provided on the rear side of the nozzle (573) corresponding to the lower right side of the atomizer (574). When the limit clip (576) rotates to contact the adjusting bolt (577), by tightening the adjusting bolt (577) to press the limit clip (576), the front end of the limit clip (576) abuts against the outer wall of the atomizer (574) to form axial limitation. A cover plate (578) is detachably connected to the top of the housing (571), and a second through groove (579) aligned with the outlet of the atomizer (574) is formed in the center of the cover plate (578).

8. The electrostatic spraying device with multi-group rotary cup synchronous drive and constant pressure material supply according to claim 1, characterized in that: The stiffness coefficient of the disc spring group (44) changes non-linearly with the compression amount, and the ratio of its maximum compression stroke to the height of the rectangular guide groove (3) is 1:3.

5.

9. The electrostatic spraying device for synchronous driving of multiple rotary cups and constant-pressure material supply according to claim 3, wherein: The tooth pitch of the first synchronous belt (424), the second synchronous belt (425) and the third synchronous belt (427) is equal, and the surface of the synchronous belt is coated with a wear-resistant polyurethane coating.

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