CN114192330A

CN114192330A - Three-dimensional spraying system for large-sized workpiece

Info

Publication number: CN114192330A
Application number: CN202111564344.1A
Authority: CN
Inventors: 钱晓军; 范冬萍; 周俊生
Original assignee: Suzhou Nanshi University Science Park Investment Management Co ltd; Nanjing Normal University
Current assignee: Suzhou Nanshi University Science Park Investment Management Co ltd; Nanjing Normal University
Priority date: 2021-12-20
Filing date: 2021-12-20
Publication date: 2022-03-18

Abstract

The invention discloses a three-dimensional spraying system for large-sized workpieces, which comprises a track conveying device and a three-dimensional paint spraying device, wherein the track conveying device comprises a track conveying device and a track spraying device; the rail conveying device comprises two supporting rails, a translation driving mechanism and a workpiece supporting mechanism; the three-dimensional paint spraying device comprises a paint spraying chamber shell, a suspension type paint spraying mechanism, an in-out closing mechanism and a paint mist purifying mechanism; the access closing mechanism comprises a closing drive unit and two window closing units. The three-dimensional spraying system for the large-sized workpiece can spray paint on the whole body of the workpiece by utilizing the suspension type paint spraying mechanism, so that the requirement of uniform paint spraying of the large-sized workpiece is met, and the paint spraying efficiency is improved; the paint mist purification mechanism can be used for sucking scattered paint mist, so that the possibility of the paint mist leaking from the rail access window is reduced; utilize two support rails and translation actuating mechanism's cooperation, can be convenient for transversely transport the work piece to realize the last unloading of work piece and transport, improve the efficiency of spraying paint.

Description

Three-dimensional spraying system for large-sized workpiece

Technical Field

The invention relates to a spraying system, in particular to a three-dimensional spraying system for large-sized workpieces.

Background

At present, when large-sized workpieces are coated, for example, a trailer box of a trailer truck, automatic spraying is difficult to perform due to the fact that the workpieces are large in size and need to be sprayed on the inner side and the outer side, and the existing method adopts manual spraying, so that the uniformity of spraying is poor, and the coating efficiency is not high. Therefore, it is necessary to design a three-dimensional spraying system for large-sized workpieces, which can meet the requirement of automatic coating of the inner side and the outer side of the large-sized workpieces, ensure coating uniformity and improve coating efficiency.

Disclosure of Invention

The purpose of the invention is as follows: the three-dimensional spraying system for the large-sized workpiece can meet the requirement of automatic coating of the inner side and the outer side of the large-sized workpiece, ensure coating uniformity and improve coating efficiency.

The technical scheme is as follows: the invention relates to a three-dimensional spraying system for large-sized workpieces, which comprises a track conveying device and a three-dimensional spraying device; the rail conveying device comprises two supporting rails, a translation driving mechanism and a workpiece supporting mechanism; the three-dimensional paint spraying device comprises a paint spraying chamber shell, a suspension type paint spraying mechanism, an in-out closing mechanism and a paint mist purifying mechanism; the in-out sealing mechanism comprises a sealing driving unit and two window sealing units;

the left side surface and the right side surface of the spray booth shell are respectively provided with a track access window, and the support track transversely penetrates through the two track access windows; the closed driving unit is arranged at the top of the spray booth shell, the two window closing units are respectively arranged at the left end and the right end of the spray booth shell, and the closed driving unit synchronously drives the two window closing units to open or close the rail inlet and outlet windows; the workpiece supporting mechanism is movably arranged on the supporting track and used for stably supporting the workpiece; the translation driving mechanism is used for driving the workpiece supporting mechanism to transversely move along the supporting track;

the suspended paint spraying mechanism is installed on the inner top of the paint spraying chamber shell in a suspended mode and is used for performing three-dimensional paint spraying on the workpiece conveyed into the paint spraying chamber shell by the workpiece supporting mechanism; the paint mist purification mechanism is used for sucking and purifying paint mist diffused in the paint spraying chamber shell.

Furthermore, the closed driving unit comprises a closed driving motor, a closed driving worm wheel, a steel rope winding roller and four driving steel ropes; the steel rope winding roller is rotatably and longitudinally arranged on the top of the spray booth shell, and the closed driving worm wheel is coaxially fixed on the end part of the steel rope winding roller; the output shaft of the closed driving motor is butted with the closed driving worm; the closed driving worm is meshed with the closed driving worm wheel; one ends of the four driving steel ropes are wound on the steel rope winding rollers, and the other ends of the four driving steel ropes are fixed on the two window closing units in pairs respectively and are used for synchronously pulling and driving the two window closing units.

Further, the window closing unit comprises a U-shaped frame and a closing inserting plate; two pulley supports are arranged at the left side and the right side of the top of the spray booth shell, and a steering pulley is rotatably arranged on each pulley support; the U-shaped frame is fixedly arranged on the upper part of the rail access window; the closed inserting plate vertically penetrates through the upper side frame of the U-shaped frame, and the front side edge and the rear side edge of the closed inserting plate are embedded into the front side frame and the rear side frame of the U-shaped frame in a sliding mode; two rectangular notches which are convenient for two supporting rails to pass through are arranged at the lower side edge of the closed inserting plate; the driving steel rope is turned downwards from the steering pulley and then fixed on the upper side edge of the closed inserting plate.

Further, the workpiece supporting mechanism comprises a rectangular supporting seat, a switching driving motor, two switching supporting shafts and two C-shaped sliding seats; the two C-shaped sliding seats are respectively installed on the two supporting rails in a buckling manner, each rail supporting roller is installed in the C-shaped sliding seat in a rotating manner, and the rail supporting rollers are supported and run on the upper side surfaces of the supporting rails; the rectangular supporting seat is horizontally arranged between the two C-shaped sliding seats, and a rectangular supporting notch is formed in each of the left side edge and the right side edge of the rectangular supporting seat; the two switching support shafts are respectively longitudinally and rotatably arranged in the rectangular support notches, four guide sleeves are vertically arranged at two ends of each switching support shaft, and the four guide sleeves are distributed in a cross shape; a sleeve supporting spring is arranged in each of the four guide sleeves; a workpiece supporting pipe column with the length corresponding to the height of the workpiece supporting point is sleeved on each of the four guide sleeves, and a supporting disc is arranged at the extending end part of each workpiece supporting pipe column; the sleeve supporting spring is elastically supported on the supporting disc and used for pushing the workpiece supporting pipe column to be far away from the switching supporting shaft; a rotating shaft limiting notch is formed in the sleeving end of the workpiece supporting pipe column, a rotating shaft limiting convex strip is arranged on the groove edge of the rectangular supporting notch, and the rotating shaft limiting notch is buckled on the rotating shaft limiting convex strip when the workpiece supporting pipe column is pressed and supported on the switching supporting shaft; the switching driving motor synchronously drives the two switching supporting shafts to rotate through the chain wheel driving mechanism.

Further, the translation driving mechanism comprises a translation driving rack and a translation driving motor; the translation driving rack is transversely arranged on the inner side surface of the supporting track, the translation driving motor is arranged on the workpiece supporting mechanism, and a translation driving gear meshed with the translation driving rack is arranged on an output shaft of the translation driving motor.

Further, the suspension type paint spraying mechanism comprises a horizontal adjusting unit, a lifting adjusting unit and a spray head unit; the horizontal adjusting unit is installed on the inner top of the spray booth shell in a suspension mode, the lifting adjusting unit is installed on the horizontal adjusting unit, the spray head unit is installed on the lifting adjusting unit, the horizontal adjusting unit adjusts the horizontal position of the lifting adjusting unit, and the lifting adjusting unit adjusts the height position of the spray head unit; the direction of the spray paint is adjusted by the spray head unit.

Further, the horizontal adjusting unit comprises a tubular longitudinal beam, a longitudinal adjusting motor, a longitudinal adjusting sliding sleeve, a transverse adjusting beam, a transverse adjusting motor and a U-shaped sliding seat; the tubular longitudinal beam is longitudinally suspended on the inner top of the outer shell of the spray booth and is internally and rotatably provided with a longitudinal adjusting screw; an output shaft of the longitudinal adjusting motor d is butted with the longitudinal adjusting screw rod; the longitudinal adjusting sliding sleeve is sleeved on the tubular longitudinal beam in a sliding manner; the tubular longitudinal beam is longitudinally provided with a limiting strip-shaped hole, a longitudinal adjusting slide block which is screwed and installed on the longitudinal adjusting screw rod in a threaded manner is arranged in the tubular longitudinal beam, and the longitudinal adjusting slide block is fixed on the longitudinal adjusting slide sleeve; the middle of the upper side of the transverse adjusting beam is transversely and fixedly arranged on the lower side surface of the longitudinal adjusting sliding sleeve, and the front side surface and the rear side surface of the transverse adjusting beam are respectively provided with a roller supporting groove along the length direction; the U-shaped sliding seat is installed on the lower side edge of the transverse adjusting beam in a buckling mode, four transverse supporting rollers are installed on the inner side faces of the two vertical side plates of the U-shaped sliding seat in a rotating mode, and the four transverse supporting rollers are supported and run on the upper side groove edge and the lower side groove edge of the roller supporting groove on the corresponding side in pairs; a transverse adjusting rack is transversely arranged on the transverse adjusting beam, and a transverse adjusting gear meshed with the transverse adjusting rack is arranged at the end part of an output shaft of the transverse adjusting motor; the lifting adjusting unit is arranged on the lower side surface of the U-shaped sliding seat.

Further, the lifting adjusting unit comprises a rotary driving motor and an electric telescopic rod; the upper end of the electric telescopic rod is vertically and fixedly arranged on the lower side surface of the U-shaped sliding seat, and a rotary driven gear is arranged at the upper end of the electric telescopic rod; the rotary driving motor is fixedly arranged on the side edge of the U-shaped sliding seat, and a rotary driving gear meshed with the rotary driven gear is arranged on the output shaft; the spray head unit is fixedly arranged at the telescopic end of the electric telescopic rod.

Furthermore, the spray head unit comprises a pitching adjusting motor, a spray pipe, a U-shaped mounting plate and a pitching adjusting worm wheel; the U-shaped mounting plate is fixedly arranged on the lifting adjusting unit, and a pitching adjusting worm is rotatably arranged between two side plates of the U-shaped mounting plate; the output shaft of the pitching adjusting motor is butted with the end part of the pitching adjusting worm; the pitching adjusting worm wheel is rotatably arranged at the lower part of the U-shaped mounting plate and is meshed with the pitching adjusting worm; one end of the spray pipe is radially fixed on the circumference of the pitching adjusting worm wheel, and the other end of the spray pipe is closed; the spraying pipe is provided with paint nozzles at intervals, and the spraying pipe is communicated with a paint hose communicated with an outlet of the paint pump.

Further, the paint mist purification mechanism comprises a suction fan and a spraying purification unit; the spraying purification unit comprises a spraying box, a spraying pump, a circulating pump, a closed-loop steel mesh belt, a strip-shaped collecting tank, a U-shaped bending baffle, an extrusion spring, a mesh belt driving motor, a cotton belt driving motor and a closed-loop adsorption cotton belt; a spraying partition plate is vertically and fixedly arranged in the spraying box and used for dividing the interior of the spraying box into a spraying bin and a water storage bin, and an airflow channel is reserved between the upper side edge of the spraying partition plate and the inner top surface of the spraying box; a suction hood communicated with the inside is arranged at the top of the spray chamber shell; the air inlet of the suction fan is communicated with the suction cover, the air outlet of the suction fan is communicated with the spraying bin through a suction pipeline, and the lower end part of the suction pipeline extends into the lower part of the spraying bin; each annular spraying pipe is arranged in the spraying bin from bottom to top at intervals, and each spraying head is arranged on each annular spraying pipe; the spray pump and the circulating pump are both arranged in the water storage bin, and the water outlet of the spray pump is communicated with each annular spray pipe; the outer top of a bending plate of the U-shaped bending baffle is closely attached to the inner top of the spraying box, two vertical side plates of the U-shaped bending baffle extend downwards into the water storage bin, and the front side edge and the rear side edge of each vertical side plate of the U-shaped bending baffle are respectively fixed on the inner walls of the front side and the rear side of the water storage bin; the closed-loop steel mesh belt is vertically tensioned in the spraying box through two mesh belt driving rollers, the upper part of the closed-loop steel mesh belt is close to the inner side surface of the bending plate of the U-shaped bending baffle, and the lower part of the closed-loop steel mesh belt extends into the water storage bin; two vertical side plates of the U-shaped bent baffle are respectively provided with a ventilation window for airflow to transversely pass through a steel mesh surface of the closed-loop steel mesh belt; a columnar communicating cavity is longitudinally arranged in the top of the bending plate of the U-shaped bending baffle, and a strip-shaped gap communicated with the columnar communicating cavity is longitudinally arranged on the inner side surface of the bending plate of the U-shaped bending baffle; the water inlet of the circulating pump is communicated with the bottom of the spraying bin, and the water outlet of the circulating pump is communicated with the columnar communicating cavity; a strip-shaped sealing cover is arranged at the top of the spraying box; the closed-loop adsorption cotton belt is vertically installed through the two cotton belt driving rollers, the upper part of the closed-loop adsorption cotton belt extends into the strip-shaped sealing cover, and the lower part of the closed-loop adsorption cotton belt extends downwards into the water storage bin; the strip-shaped collecting groove is longitudinally arranged on the top of the spraying box in a sliding manner; one side of the strip-shaped collecting tank is inclined upwards to form a scraping wall edge, and the scraping wall edge is close to the closed-loop adsorption cotton belt; the extrusion spring is elastically supported between the strip-shaped sealing cover and the strip-shaped collecting tank and is used for pushing the edge of the scraping wall to elastically press the closed-loop adsorption cotton belt; a discharge hose extending out of the strip-shaped sealing cover is communicated and arranged on the end surface of the strip-shaped collecting groove; the mesh belt driving motor is used for rotationally driving the mesh belt driving roller on the upper side; the cotton belt driving motor is used for rotationally driving the cotton belt driving roller on the upper side; a water replenishing pipe opening is communicated and arranged at the top of the spraying box and above the water storage bin; and a tail gas outlet is communicated with the top of the spraying box and positioned at the downstream of the airflow of the ventilation window.

Compared with the prior art, the invention has the beneficial effects that: the suspended paint spraying mechanism can be used for spraying paint on the whole body of the workpiece, so that the requirement of uniform paint spraying of large workpieces is met, and the paint spraying efficiency is improved; the rail access window can be locally sealed before the paint spraying treatment by using the access sealing mechanism, so that the leakage of paint mist is reduced, and the air pollution of the paint mist to a workshop is reduced; the paint mist purification mechanism can be used for sucking scattered paint mist, so that the possibility of the paint mist leaking from the rail access window is reduced; the workpiece can be conveniently and transversely transported by matching the two support rails and the translation driving mechanism, so that the loading and unloading transfer of the workpiece is realized, and the paint spraying efficiency is improved; the workpiece can be stably supported by the workpiece supporting mechanism, so that the requirement of spraying paint on the whole body of the workpiece is met.

Drawings

FIG. 1 is a schematic diagram of the overall front view of the system of the present invention;

FIG. 2 is a partial left view schematic diagram of the system of the present invention;

FIG. 3 is a schematic view of the installation structure of the suspension type paint spraying mechanism of the present invention;

FIG. 4 is a schematic top view of a portion of the workpiece support mechanism of the present invention;

FIG. 5 is a schematic sectional view of the paint mist purifying mechanism according to the present invention.

Detailed Description

The technical solution of the present invention is described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the embodiments.

Example 1:

as shown in fig. 1 to 5, the stereoscopic coating system for large workpieces disclosed in the present invention comprises: a track conveying device and a three-dimensional paint spraying device; the rail conveying device comprises two supporting rails 1, a translation driving mechanism and a workpiece supporting mechanism; the three-dimensional paint spraying device comprises a paint spraying chamber shell 18, a suspension type paint spraying mechanism, an in-out closing mechanism and a paint mist purifying mechanism; the in-out sealing mechanism comprises a sealing driving unit and two window sealing units;

a track access window is arranged on each of the left side surface and the right side surface of the spray booth shell 18, and the support track 1 transversely penetrates through the two track access windows; the closed driving unit is arranged at the top of the spray booth shell 18, the two window closing units are respectively arranged at the left end and the right end of the spray booth shell 18, and the closed driving unit synchronously drives the two window closing units to open or close the rail access window; the lower side surface of the support track 1 is provided with track support legs 2 at intervals; the workpiece supporting mechanism is movably arranged on the supporting track 1 and is used for stably supporting the workpiece 100; the translation driving mechanism is used for driving the workpiece supporting mechanism to transversely move along the supporting track 1;

the suspended paint spraying mechanism is installed on the inner top of the paint spraying chamber shell 18 in a suspended mode and is used for performing three-dimensional paint spraying on the workpiece 100 conveyed into the paint spraying chamber shell 18 by the workpiece supporting mechanism; the paint mist purification mechanism is used for sucking and purifying the paint mist diffused in the paint spray chamber housing 18.

The suspended paint spraying mechanism can be used for spraying paint on the whole body of the workpiece 100, so that the requirement of uniform paint spraying of large workpieces is met, and the paint spraying efficiency is improved; the rail access window can be locally sealed before the paint spraying treatment by using the access sealing mechanism, so that the leakage of paint mist is reduced, and the air pollution of the paint mist to a workshop is reduced; the paint mist purification mechanism can be used for sucking scattered paint mist, so that the possibility of the paint mist leaking from the rail access window is reduced; the two support rails 1 are matched with the translation driving mechanism, so that the workpiece 100 can be conveniently and transversely transported, the feeding and discharging transportation of the workpiece 100 is realized, and the paint spraying efficiency is improved; the workpiece 100 can be stably supported by the workpiece supporting mechanism, so that the requirement of spraying paint around the workpiece is met.

Further, the closed driving unit comprises a closed driving motor 67, a closed driving worm 68, a closed driving worm wheel 70, a steel rope winding roller 69 and four driving steel ropes 71; the steel rope winding roller 69 is rotatably and longitudinally arranged on the top of the spray booth shell 18, and the closed driving worm gear 70 is coaxially fixed on the end part of the steel rope winding roller 69; the closed driving motor 67 is fixedly arranged on the top of the spray booth shell 18, and an output shaft of the closed driving motor 67 is butted with the closed driving worm 68; the closed driving worm 68 is meshed with a closed driving worm wheel 70; one ends of four driving steel ropes 71 are wound on the steel rope winding rollers 69, and the other ends of the four driving steel ropes are fixed on the two window closing units in pairs respectively and are used for synchronously pulling and driving the two window closing units.

By the winding and matching of the steel rope winding roller 69 and the four driving steel ropes 71, the two window closing units can be synchronously pulled and driven, and the closing consistency is ensured; the rotation and positioning of the cable winding roller 69 can be controlled by the cooperation of the close drive motor 67, the close drive worm 68 and the close drive worm gear 70.

Further, the window closing unit comprises a U-shaped frame 65 and a closing insertion plate 66; two pulley supports 72 are arranged at the left side and the right side of the top of the spray booth shell 18, and a diverting pulley 73 is rotatably arranged on each pulley support 72; the U-shaped frame 65 is fixedly arranged at the upper part of the track access window; the closed inserting plate 66 vertically penetrates through the upper side frame of the U-shaped frame 65, and the front side edge and the rear side edge of the closed inserting plate 66 are slidably embedded into the front side frame and the rear side frame of the U-shaped frame 65; two rectangular notches 74 which are convenient for two supporting rails 1 to pass through are arranged at the lower side edge of the closed inserting plate 66; the drive cable 71 is turned from the deflection pulley 73 downwards and fixed to the upper side of the closing plug 66.

The driving steel rope 71 can be steered by a steering pulley 73 arranged on a pulley support 72, so that the driving steel rope 71 keeps vertical tension when being connected to the closed inserting plate 66, and the lifting resistance of the closed inserting plate 66 at the U-shaped frame 65 is reduced; the use of rectangular notches 74 facilitates the passage of two support rails 1, further enhancing the sealing effect of the rails in and out of the window.

Further, the workpiece supporting mechanism comprises a rectangular supporting seat 16, a switching driving motor 12, two switching supporting shafts 8 and two C-shaped sliding seats 3; the two C-shaped sliding seats 3 are respectively installed on the two supporting rails 1 in a buckling manner, each rail supporting roller 17 is installed in the C-shaped sliding seat 3 in a rotating manner, and the rail supporting rollers 17 are supported and run on the upper side surfaces of the supporting rails 1; the rectangular supporting seat 16 is horizontally arranged between the two C-shaped sliding seats 3, and the left side edge and the right side edge of the rectangular supporting seat 16 are respectively provided with a rectangular supporting notch 7; two switching support shafts 8 are respectively longitudinally and rotatably arranged in the rectangular support notch 7, and four guide sleeves are vertically arranged at two ends of each switching support shaft 8 and are distributed in a cross shape; a sleeve supporting spring is arranged in each of the four guide sleeves; a workpiece supporting tubular column 4 with the length corresponding to the height of the supporting point of the workpiece 100 is sleeved on each of the four guide sleeves, a supporting disc 5 is arranged at the extending end part of each workpiece supporting tubular column 4, and a supporting anti-skid pad 6 is arranged on each supporting disc 5; the sleeve supporting spring is elastically supported on the supporting disc 5 and used for pushing the workpiece supporting pipe column 4 to be far away from the switching supporting shaft 8; a telescopic limiting sliding groove is formed in the outer wall of the guide sleeve, and a telescopic limiting sliding block which is embedded into the telescopic limiting sliding groove in a sliding manner is arranged on the inner wall of the workpiece supporting tubular column 4; a rotating shaft limiting notch 11 is formed in the sleeving end of the workpiece supporting pipe column 4, a rotating shaft limiting convex strip 10 is arranged on the groove edge of the rectangular supporting notch 7, and the rotating shaft limiting notch 11 is buckled on the rotating shaft limiting convex strip 10 when the workpiece supporting pipe column 4 is supported on the switching supporting shaft 8 in a pressed mode; the switching drive motor 12 is fixedly arranged on the lower side surface of the rectangular supporting seat 16 and synchronously drives the two switching supporting shafts 8 to rotate through the chain wheel drive mechanism 9.

By utilizing the matching of the rail support rollers 17 and the support rails 1, the two C-shaped sliding seats 3 can stably move, and the translation resistance is reduced; by utilizing the matching of the switching driving motor 12 and the chain wheel driving mechanism 9, the two switching supporting shafts 8 can be synchronously driven to rotate, so that the four workpiece supporting tubular columns 4 with corresponding lengths can be rotated to the upper part, the supporting requirements of the workpieces 100 with four different bottom supporting points are at least met, and the switching driving mechanism has better adaptability; by utilizing the matching of the rotating shaft limiting convex strips 10 and the rotating shaft limiting notches 11, when the workpiece 100 is placed on the supporting and protecting pad 6, the workpiece supporting tubular columns 4 are pressed and supported on the switching supporting shafts 8, and at the moment, the rotating shaft limiting notches 11 are buckled on the rotating shaft limiting convex strips 10, so that the rotation of the two switching supporting shafts 8 is effectively limited, and the supporting stability of the workpiece supporting tubular columns 4 in the supporting and rotating processes of the workpiece 100 is ensured; by means of the arrangement of the sleeve supporting spring, the workpiece supporting pipe column 4 can be bounced when the workpiece 100 is not placed, so that the rotation switching of the two switching supporting shafts 8 is facilitated; the stability of the support of the workpiece support pipe column 4 can be enhanced by the insertion fit of the guide sleeve and the workpiece support pipe column 4; by means of the matching of the telescopic limiting sliding groove and the telescopic limiting sliding block, the separation of the workpiece supporting tubular column 4 can be prevented, and the rotation of the workpiece supporting tubular column 4 can be limited.

Further, the translation driving mechanism comprises a translation driving rack 15 and a translation driving motor 13; a translation driving rack 15 is transversely arranged on the inner side surface of the support rail 1, a translation driving motor 13 is arranged on the workpiece support mechanism, and a translation driving gear 14 meshed with the translation driving rack 15 is arranged on an output shaft of the translation driving motor 13.

The workpiece support mechanism can be driven in translation along the support rail 1 by cooperation of the translation drive motor 13, the translation drive rack 15 and the translation drive gear 14.

Further, the suspension type paint spraying mechanism comprises a horizontal adjusting unit, a lifting adjusting unit and a spray head unit; the horizontal adjusting unit is installed on the inner top of the spray chamber shell 18 in a suspension mode, the lifting adjusting unit is installed on the horizontal adjusting unit, the spray head unit is installed on the lifting adjusting unit, the horizontal adjusting unit adjusts the horizontal position of the lifting adjusting unit, and the lifting adjusting unit adjusts the height position of the spray head unit; the direction of the spray paint is adjusted by the spray head unit.

The horizontal adjusting unit and the lifting adjusting unit can be used for carrying out three-dimensional position adjustment on the spray head unit, so that the three-dimensional paint spraying requirement of the workpiece 100 is met; the spray nozzle unit can be used for adjusting the spray direction, so that the multi-angle spray requirement of different positions of the workpiece 100 is met.

Further, the horizontal adjusting unit comprises a tubular longitudinal beam 22, a longitudinal adjusting motor 23, a longitudinal adjusting sliding sleeve 26, a transverse adjusting beam 105, a transverse adjusting motor 28 and a U-shaped sliding seat 108; the tubular longitudinal beam 22 is longitudinally suspended on the inner top of the spray booth shell 18, and a longitudinal adjusting screw 25 is rotatably arranged in the tubular longitudinal beam 22; the longitudinal adjusting motor 23 is arranged on the end part of the tubular longitudinal beam 22, and the output shaft is butted with the longitudinal adjusting screw 25; the longitudinal adjusting sliding sleeve 26 is sleeved on the tubular longitudinal beam 22 in a sliding manner; a limiting strip-shaped hole 24 is longitudinally arranged on the tubular longitudinal beam 22, a longitudinal adjusting slide block which is screwed on and installed on a longitudinal adjusting screw rod 25 is arranged in the tubular longitudinal beam 22, and the longitudinal adjusting slide block is fixed on a longitudinal adjusting slide sleeve 26 through a connecting column; the middle of the upper side of the transverse adjusting beam 105 is transversely and fixedly arranged on the lower side of the longitudinal adjusting sliding sleeve 26, and the front side and the rear side of the transverse adjusting beam 105 are provided with a roller supporting groove 107 along the length direction; the U-shaped sliding seat 108 is installed on the lower side edge of the transverse adjusting beam 105 in a buckling mode, four transverse supporting rollers 106 are installed on the inner side faces of two vertical side plates of the U-shaped sliding seat 108 in a rotating mode, and the four transverse supporting rollers 106 are supported and walk on the upper side groove edge and the lower side groove edge of the roller supporting groove 107 on the corresponding side in pairs respectively; a transverse adjusting rack 27 is transversely arranged on the transverse adjusting beam 105, a transverse adjusting motor 28 is fixedly arranged on the U-shaped sliding seat 108, and a transverse adjusting gear 29 meshed with the transverse adjusting rack 27 is arranged at the end part of an output shaft of the transverse adjusting motor 28; the lifting adjusting unit is mounted on the lower side of the U-shaped sliding seat 108.

The longitudinal adjustment of the lifting adjusting unit can be realized by the matching of the tubular longitudinal beam 22, the longitudinal adjusting motor 23 and the longitudinal adjusting sliding sleeve 26; the transverse adjustment of the lifting adjusting unit can be realized by the cooperation of the transverse adjusting beam 105, the transverse adjusting motor 28 and the U-shaped sliding seat 108; by utilizing the matching of the transverse supporting roller 106 and the roller supporting groove 107, the suspension type installation requirement of the U-shaped sliding seat 108 can be met, and meanwhile, the resistance of transverse adjustment can also be reduced.

Further, the lifting adjusting unit comprises a rotary driving motor 30 and an electric telescopic rod 32; the upper end of the electric telescopic rod 32 is vertically and fixedly arranged on the lower side surface of the U-shaped sliding seat 108, and a rotary driven gear 33 is arranged at the upper end of the electric telescopic rod 32; the rotary driving motor 30 is fixedly arranged on the side edge of the U-shaped sliding seat 108, and a rotary driving gear 31 meshed with the rotary driven gear 33 is arranged on the output shaft; the spray head unit is fixedly mounted on the telescopic end of the electric telescopic rod 32.

The rotation driving of the electric telescopic rod 32 can be realized by the cooperation of the rotation driving motor 30, the rotation driving gear 31 and the rotation driven gear 33, thereby meeting the horizontal rotation adjustment requirement of the spray head unit.

Further, the spray head unit comprises a pitch adjusting motor 35, a spray pipe 39, a U-shaped mounting plate 34 and a pitch adjusting worm gear 38; the U-shaped mounting plate 34 is fixedly arranged on the lifting adjusting unit, and a pitching adjusting worm 36 is rotatably arranged between two side plates of the U-shaped mounting plate 34; the output shaft of the pitch adjustment motor 35 is butted against the end of the pitch adjustment worm 36; the pitch adjusting worm gear 38 is rotatably mounted on the lower part of the U-shaped mounting plate 34 through a worm gear support 37, and the pitch adjusting worm gear 38 is meshed with the pitch adjusting worm 36; one end of the spray pipe 39 is radially fixed on the circumference of the pitch adjusting worm gear 38, and the other end of the spray pipe 39 is closed; the spray pipe 39 is provided with a plurality of paint nozzles 40 at intervals, and the spray pipe 39 is communicated with a paint hose for communicating with the paint pump outlet.

The swing driving of the spray pipe 39 can be realized by utilizing the matching of the pitch adjusting motor 35, the pitch adjusting worm gear 38 and the pitch adjusting worm 36, so that the pitch angle adjustment of each paint nozzle 40 is met, the spray pipe can horizontally stretch into a gap between the rectangular support base 16 and the workpiece 100 to spray paint on the bottom of the workpiece 100, and the requirement of comprehensive paint spraying of the workpiece 100 is met.

Further, the paint mist purification mechanism comprises a suction fan 20 and a spraying purification unit; the spraying purification unit comprises a spraying box 41, a spraying pump 52, a circulating pump 53, a closed-loop steel mesh belt 59, a strip-shaped collecting tank 63, a U-shaped bent baffle 55, an extrusion spring 62, a mesh belt driving motor, a cotton belt driving motor and a closed-loop adsorption cotton belt 61; a spraying partition plate 48 is vertically and fixedly arranged in the spraying tank 41 and used for dividing the inside of the spraying tank 41 into a spraying chamber and a water storage chamber, and an airflow channel is reserved between the upper side edge of the spraying partition plate 48 and the inner top surface of the spraying tank 41; a suction hood 19 communicated with the inside is arranged at the top of the spray chamber shell 18; an air inlet of the suction fan 20 is communicated with the suction cover 19, an air outlet of the suction fan 20 is communicated with the spraying bin through a suction pipeline 21, the lower end part of the suction pipeline 21 extends into the lower part of the spraying bin, and a vertical ventilating pipeline 49 is vertically communicated with the extending end; a diffusion impeller 50 is rotatably arranged at the upper end pipe orifice of the vertical ventilating duct 49; each annular spraying pipe 46 is arranged in the spraying bin from bottom to top at intervals, and each spraying head 47 is arranged on each annular spraying pipe 46; the spray pump 52 and the circulating pump 53 are both arranged in the water storage bin, and the water outlet of the spray pump 52 is communicated with each annular spray pipe 46 through a spray pipeline 51; the outer top of the bent plate of the U-shaped bent baffle 55 is closely attached to the inner top of the spray box 41, two vertical side plates of the U-shaped bent baffle 55 extend downwards into the water storage bin, and the front side and the rear side of the two vertical side plates of the U-shaped bent baffle 55 are respectively fixed on the inner walls of the front side and the rear side of the water storage bin; the closed-loop steel mesh belt 59 is vertically tensioned and installed in the spray box 41 through two mesh belt driving rollers 58, the upper part of the closed-loop steel mesh belt 59 is close to the inner side surface of the bending plate of the U-shaped bending baffle 55, and the lower part of the closed-loop steel mesh belt 59 extends into the water storage bin; a ventilation window 57 is arranged on each of the two vertical side plates of the U-shaped bent baffle 55 and used for enabling airflow to transversely pass through the steel mesh surface of the closed-loop steel mesh belt 59; a columnar communicating cavity 56 is longitudinally arranged in the top of the bending plate of the U-shaped bending baffle 55, and a strip-shaped gap communicated with the columnar communicating cavity 56 is longitudinally arranged on the inner side surface of the bending plate of the U-shaped bending baffle 55; the water inlet of the circulating pump 53 is communicated with the bottom of the spraying bin, and the water outlet of the circulating pump 53 is communicated with the columnar communicating cavity 56 through a circulating water pipe 54; a strip-shaped sealing cover 44 is arranged at the top of the spraying box 41 and above the water storage bin; the closed-loop adsorption cotton belt 61 is vertically installed through the two cotton belt driving rollers 60, the upper part of the closed-loop adsorption cotton belt 61 penetrates through the top of the spraying box 41 and extends into the strip-shaped sealing cover 44, and the lower part of the closed-loop adsorption cotton belt 61 extends downwards into the water storage bin; the strip-shaped collecting tank 63 is longitudinally arranged on the top of the spraying box 41 in a sliding manner and is positioned in the strip-shaped sealing cover 44; one side of the strip-shaped collecting tank 63 is inclined upwards to form a scraping wall edge 64, and the scraping wall edge 64 is close to the closed-loop adsorption cotton belt 61; the extrusion spring 62 is elastically supported between the strip-shaped sealing cover 44 and the strip-shaped collecting groove 63 and is used for pushing the scraping wall edge 64 to elastically press on the closed-loop adsorption cotton belt 61; a discharge hose 43 extending out of the strip-shaped sealing cover 44 is communicated and arranged on the end surface of the strip-shaped collecting groove 63; the mesh belt driving motor is arranged on the outer side surface of the spraying box 41 and is used for rotationally driving the mesh belt driving roller 58 on the upper side; a cotton belt driving motor is installed on the outer side surface of the strip-shaped sealing cover 44 and is used for rotationally driving the cotton belt driving roller 60 on the upper side; a water replenishing pipe port 45 is communicated and arranged at the top of the spraying tank 41 and above the water storage bin; an exhaust gas outlet 42 is arranged at the top of the spray box 41 and communicated with the air flow downstream of the ventilation window 57.

The pumped paint mist-containing air flow is sprayed and purified by utilizing the spray heads 47 on the annular spray pipes 46 arranged from bottom to top in the spray bin, so that the paint mist content in the air flow can be effectively reduced; the diffusion impeller 50 can disperse airflow, so that the airflow can be conveniently and fully contacted with sprayed water mist, and the purification effect is improved; by utilizing the cooperation of the mesh belt driving motor, the U-shaped bent baffle 55, the closed-loop steel mesh belt 59 and the two mesh belt driving rollers 58, the closed-loop steel mesh belt 59 can be driven by the operation of the closed-loop steel mesh belt 59 to be full of spraying liquid in the water storage bin, so that the airflow filtration close to a water curtain can be performed on the airflow after spraying purification, the airflow containing water vapor and residual paint mist can be in full contact with the water curtain circulating on the closed-loop steel mesh belt 59, and the filtering effect of the paint mist is further enhanced; by utilizing the matching of the columnar communicating cavity 56, the strip-shaped gap, the circulating water pipe 54 and the circulating pump 53, water can be supplied to the upper part of the closed-loop steel mesh belt 59, so that the water curtain effect of the closed-loop steel mesh belt 59 is further enhanced; the closed-loop steel mesh belt 59 is used for forming a water curtain, so that each fine air flow hole can be formed when air flows, and compared with a pure steel mesh-free water curtain, a larger gap cannot be formed when the air flows through the water curtain, and the water curtain has a better paint mist interception effect; the paint filtered from the water storage bin can be circularly adsorbed by matching the cotton belt driving motor, the closed-loop adsorption cotton belt 61 and the two cotton belt driving rollers 60, so that the spraying liquid is kept to have certain cleanliness; by utilizing the matching of the strip-shaped collecting groove 63, the scraping wall edge 64, the extrusion spring 62 and the discharge hose 43, the adsorbed paint can be scraped off when the closed-loop adsorption cotton belt 61 runs, and the paint is discharged through the discharge hose 43, so that the spray liquid is circularly sprayed and applied under the condition of maintaining certain cleanliness, and the tail gas purification cost is reduced; the water replenishing pipe opening 45 can be used for conveniently replenishing the spraying liquid into the water storage bin.

When the three-dimensional spraying system for large-sized workpieces is installed, an electric control cabinet is arranged, a PLC (programmable logic controller), a touch screen, a memory and motor driving circuits are usually arranged, an operator sets the type of the workpiece 100 on the electric control cabinet, the electric control cabinet carries out coordinated driving control on each motor in the system according to the type of the workpiece 100, the electric control cabinet is formed by adopting the existing electric equipment, and related control programs can be completed by adopting simple programs and are not the innovation point of the invention; after the automatic painting is finished, the paint is repaired at the supporting point of the workpiece 100, so that the full-scale painting is really realized.

As noted above, while the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limited thereto. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a three-dimensional paint finishing for large-scale work piece which characterized in that: comprises a track conveying device and a three-dimensional paint spraying device; the rail conveying device comprises two supporting rails (1), a translation driving mechanism and a workpiece supporting mechanism; the three-dimensional paint spraying device comprises a paint spraying chamber shell (18), a suspension type paint spraying mechanism, an in-out closing mechanism and a paint mist purifying mechanism; the in-out sealing mechanism comprises a sealing driving unit and two window sealing units;

the left side surface and the right side surface of the paint spraying chamber shell (18) are respectively provided with a track access window, and the support track (1) transversely penetrates through the two track access windows; the closed driving unit is arranged at the top of the spray booth shell (18), the two window closing units are respectively arranged at the left end and the right end of the spray booth shell (18), and the closed driving unit synchronously drives the two window closing units to open or close the rail access window; the workpiece supporting mechanism is movably arranged on the supporting track (1) and is used for stably supporting the workpiece (100); the translation driving mechanism is used for driving the workpiece supporting mechanism to transversely move along the supporting track (1);

the suspended paint spraying mechanism is installed on the inner top of the paint spraying chamber shell (18) in a suspended mode and is used for performing three-dimensional paint spraying on the workpiece (100) conveyed into the paint spraying chamber shell (18) by the workpiece supporting mechanism; the paint mist purification mechanism is used for sucking and purifying paint mist diffused in the paint spraying chamber shell (18).

2. The stereoscopic coating system for large workpieces according to claim 1, wherein: the closed driving unit comprises a closed driving motor (67), a closed driving worm (68), a closed driving worm wheel (70), a steel rope winding roller (69) and four driving steel ropes (71); the steel rope winding roller (69) is rotatably and longitudinally arranged on the top of the spray booth shell (18), and the closed driving worm gear (70) is coaxially fixed on the end part of the steel rope winding roller (69); the output shaft of the closed driving motor (67) is butted with the closed driving worm (68); the closed driving worm (68) is meshed with a closed driving worm wheel (70); one ends of four driving steel ropes (71) are wound on the steel rope winding rollers (69), and the other ends of the four driving steel ropes are fixed on the two window closing units in pairs respectively and are used for synchronously pulling and driving the two window closing units.

3. The stereoscopic coating system for large workpieces according to claim 2, wherein: the window closing unit comprises a U-shaped frame (65) and a closing inserting plate (66); two pulley supports (72) are arranged at the left side and the right side of the top of the spray booth shell (18), and a steering pulley (73) is rotatably arranged on each pulley support (72); the U-shaped frame (65) is fixedly arranged at the upper part of the track access window; the closed inserting plate (66) vertically penetrates through the upper side frame of the U-shaped frame (65), and the front side edge and the rear side edge of the closed inserting plate (66) are slidably embedded into the front side frame and the rear side frame of the U-shaped frame (65); two rectangular notches (74) which are convenient for two supporting rails (1) to pass through are arranged at the lower side edge of the closed inserting plate (66); the driving steel cable (71) is turned downwards from the diverting pulley (73) and then fixed on the upper side edge of the closed inserting plate (66).

4. The stereoscopic coating system for large workpieces according to claim 1, wherein: the workpiece supporting mechanism comprises a rectangular supporting seat (16), a switching driving motor (12), two switching supporting shafts (8) and two C-shaped sliding seats (3); the two C-shaped sliding seats (3) are respectively installed on the two supporting rails (1) in a buckling mode, each rail supporting roller (17) is installed in the C-shaped sliding seats (3) in a rotating mode, and the rail supporting rollers (17) are supported and run on the upper side faces of the supporting rails (1); the rectangular supporting seat (16) is horizontally arranged between the two C-shaped sliding seats (3), and a rectangular supporting notch (7) is formed in each of the left side edge and the right side edge of the rectangular supporting seat (16); two switching support shafts (8) are respectively longitudinally and rotatably arranged in the rectangular support notch (7), four guide sleeves are vertically arranged at two ends of each switching support shaft (8), and the four guide sleeves are distributed in a cross shape; a sleeve supporting spring is arranged in each of the four guide sleeves; a workpiece supporting tubular column (4) with the length corresponding to the supporting point height of the workpiece (100) is sleeved on each of the four guide sleeves, and a supporting disc (5) is arranged at the extending end part of each workpiece supporting tubular column (4); the sleeve supporting spring is elastically supported on the supporting disc (5) and used for pushing the workpiece supporting pipe column (4) to be far away from the switching supporting shaft (8); a rotating shaft limiting notch (11) is arranged at the sleeving end of the workpiece supporting pipe column (4), a rotating shaft limiting convex strip (10) is arranged on the groove edge of the rectangular supporting notch (7), and the rotating shaft limiting notch (11) is buckled on the rotating shaft limiting convex strip (10) when the workpiece supporting pipe column (4) is pressed and supported on the switching supporting shaft (8); the switching drive motor (12) synchronously drives the two switching support shafts (8) to rotate through the chain wheel drive mechanism (9).

5. The stereoscopic coating system for large workpieces according to claim 1, wherein: the translation driving mechanism comprises a translation driving rack (15) and a translation driving motor (13); a translation driving rack (15) is transversely arranged on the inner side surface of the supporting track (1), a translation driving motor (13) is arranged on the workpiece supporting mechanism, and a translation driving gear (14) meshed with the translation driving rack (15) is arranged on an output shaft of the translation driving motor (13).

6. The stereoscopic coating system for large workpieces according to claim 1, wherein: the suspension type paint spraying mechanism comprises a horizontal adjusting unit, a lifting adjusting unit and a spray head unit; the horizontal adjusting unit is installed on the inner top of the spray chamber shell (18) in a suspension mode, the lifting adjusting unit is installed on the horizontal adjusting unit, the spray head unit is installed on the lifting adjusting unit, the horizontal adjusting unit adjusts the horizontal position of the lifting adjusting unit, and the lifting adjusting unit adjusts the height position of the spray head unit; the direction of the spray paint is adjusted by the spray head unit.

7. The stereoscopic coating system for large workpieces according to claim 6, wherein: the horizontal adjusting unit comprises a tubular longitudinal beam (22), a longitudinal adjusting motor (23), a longitudinal adjusting sliding sleeve (26), a transverse adjusting beam (105), a transverse adjusting motor (28) and a U-shaped sliding seat (108); the tubular longitudinal beam (22) is longitudinally suspended on the inner top of the outer shell (18) of the spray booth, and a longitudinal adjusting screw rod (25) is rotatably arranged in the tubular longitudinal beam (22); the output shaft of the longitudinal adjusting motor (23) d is butted with the longitudinal adjusting screw rod (25); the longitudinal adjusting sliding sleeve (26) is sleeved on the tubular longitudinal beam (22) in a sliding manner; a limiting strip-shaped hole (24) is longitudinally arranged on the tubular longitudinal beam (22), a longitudinal adjusting slide block which is screwed on the longitudinal adjusting screw rod (25) in a threaded manner is arranged in the tubular longitudinal beam (22), and the longitudinal adjusting slide block is fixed on the longitudinal adjusting slide sleeve (26); the middle of the upper side edge of the transverse adjusting beam (105) is transversely and fixedly arranged on the lower side surface of the longitudinal adjusting sliding sleeve (26), and the front side surface and the rear side surface of the transverse adjusting beam (105) are respectively provided with a roller supporting groove (107) along the length direction; the U-shaped sliding seat (108) is installed on the lower side edge of the transverse adjusting beam (105) in a buckling mode, four transverse supporting rollers (106) are installed on the inner side faces of two vertical side plates of the U-shaped sliding seat (108) in a rotating mode, and the four transverse supporting rollers (106) are supported and run on the upper side groove edge and the lower side groove edge of the roller supporting groove (107) on the corresponding side in a pairwise mode; a transverse adjusting rack (27) is transversely arranged on the transverse adjusting beam (105), and a transverse adjusting gear (29) meshed with the transverse adjusting rack (27) is arranged at the end part of an output shaft of the transverse adjusting motor (28); the lifting adjusting unit is arranged on the lower side surface of the U-shaped sliding seat (108).

8. The stereoscopic coating system for large workpieces according to claim 7, wherein: the lifting adjusting unit comprises a rotary driving motor (30) and an electric telescopic rod (32); the upper end of the electric telescopic rod (32) is vertically and fixedly arranged on the lower side surface of the U-shaped sliding seat (108), and a rotary driven gear (33) is arranged at the upper end of the electric telescopic rod (32); the rotary driving motor (30) is fixedly arranged on the side edge of the U-shaped sliding seat (108), and a rotary driving gear (31) meshed with the rotary driven gear (33) is arranged on an output shaft; the spray head unit is fixedly arranged on the telescopic end of the electric telescopic rod (32).

9. The stereoscopic coating system for large workpieces according to claim 6, wherein: the spray head unit comprises a pitching adjusting motor (35), a spray pipe (39), a U-shaped mounting plate (34) and a pitching adjusting worm gear (38); the U-shaped mounting plate (34) is fixedly arranged on the lifting adjusting unit, and a pitching adjusting worm (36) is rotatably arranged between two side plates of the U-shaped mounting plate (34); the output shaft of the pitch adjusting motor (35) is butted with the end part of the pitch adjusting worm (36); the pitch adjusting worm wheel (38) is rotatably arranged at the lower part of the U-shaped mounting plate (34), and the pitch adjusting worm wheel (38) is meshed with the pitch adjusting worm (36); one end of the spray pipe (39) is radially fixed on the circumference of the pitch adjusting worm wheel (38), and the other end of the spray pipe (39) is closed; the spraying pipe (39) is provided with various paint nozzles (40) at intervals, and the spraying pipe (39) is communicated with a paint hose communicated with the outlet of the paint pump.

10. The stereoscopic coating system for large workpieces according to claim 1, wherein: the paint mist purification mechanism comprises a suction fan (20) and a spraying purification unit; the spraying purification unit comprises a spraying box (41), a spraying pump (52), a circulating pump (53), a closed-loop steel mesh belt (59), a strip-shaped collecting tank (63), a U-shaped bent baffle (55), an extrusion spring (62), a mesh belt driving motor, a cotton belt driving motor and a closed-loop adsorption cotton belt (61); a spraying partition plate (48) is vertically and fixedly arranged in the spraying box (41) and is used for dividing the inside of the spraying box (41) into a spraying bin and a water storage bin, and an air flow channel is reserved between the upper side of the spraying partition plate (48) and the inner top surface of the spraying box (41); a suction hood (19) communicated with the inside is arranged at the top of the paint spraying chamber shell (18); an air inlet of the suction fan (20) is communicated with the suction cover (19), an air outlet of the suction fan (20) is communicated with the spraying bin through a suction pipeline (21), and the lower end part of the suction pipeline (21) extends into the lower part of the spraying bin; each annular spraying pipe (46) is arranged in the spraying bin from bottom to top at intervals, and each spraying head (47) is arranged on each annular spraying pipe (46); the spray pump (52) and the circulating pump (53) are both arranged in the water storage bin, and the water outlet of the spray pump (52) is communicated with each annular spray pipe (46); the outer top of a bent plate of the U-shaped bent baffle (55) is tightly attached to the inner top of the spray box (41), two vertical side plates of the U-shaped bent baffle (55) extend downwards into the water storage bin, and the front side and the rear side of the two vertical side plates of the U-shaped bent baffle (55) are respectively fixed on the inner walls of the front side and the rear side of the water storage bin; the closed-loop steel mesh belt (59) is vertically tensioned and installed in the spray box (41) through two mesh belt driving rollers (58), the upper part of the closed-loop steel mesh belt (59) is close to the inner side surface of the bending plate of the U-shaped bending baffle (55), and the lower part of the closed-loop steel mesh belt (59) extends into the water storage bin; two vertical side plates of the U-shaped bent baffle (55) are respectively provided with a ventilation window (57) for airflow to transversely pass through a steel mesh surface of a closed-loop steel mesh belt (59); a columnar communicating cavity (56) is longitudinally arranged in the top of the bending plate of the U-shaped bending baffle plate (55), and a strip-shaped gap communicated with the columnar communicating cavity (56) is longitudinally arranged on the inner side surface of the bending plate of the U-shaped bending baffle plate (55); a water inlet of the circulating pump (53) is communicated with the bottom of the spraying bin, and a water outlet of the circulating pump (53) is communicated with the columnar communicating cavity (56); a strip-shaped sealing cover (44) is arranged at the top of the spraying box (41); the closed-loop adsorption cotton belt (61) is vertically installed through two cotton belt driving rollers (60), the upper part of the closed-loop adsorption cotton belt (61) extends into the strip-shaped sealing cover (44), and the lower part of the closed-loop adsorption cotton belt (61) extends downwards into the water storage bin; the strip-shaped collecting tank (63) is longitudinally arranged on the top of the spraying box (41) in a sliding manner; one side of the strip-shaped collecting tank (63) extends upwards in an inclined way to form a scraping wall edge (64), and the scraping wall edge (64) is close to the closed-loop cotton adsorption belt (61); the extrusion spring (62) is elastically supported between the strip-shaped sealing cover (44) and the strip-shaped collecting tank (63) and is used for pushing the scraping wall edge (64) to elastically press on the closed-loop adsorption cotton belt (61); a discharge hose (43) extending out of the strip-shaped sealing cover (44) is communicated and arranged on the end surface of the strip-shaped collecting groove (63); the mesh belt driving motor is used for rotationally driving the mesh belt driving roller (58) on the upper side; the cotton belt driving motor is used for rotationally driving the cotton belt driving roller (60) on the upper side; a water replenishing pipe opening (45) is communicated and arranged at the top of the spraying box (41) and above the water storage bin; and a tail gas outlet (42) is communicated with the top of the spraying box (41) and positioned at the downstream of the airflow of the ventilation window (57).