Steel structure spraying and drying device

By designing a steel structure spraying and drying device that includes uniformly distributed spray assembly paint outlet, drying assembly heating source and air extraction port, the problems of many blind spots, low processing efficiency and large pollution in traditional spray assembly are solved, and more efficient spraying and drying treatment is achieved, and pollution to the working environment is reduced.

CN223010941UActive Publication Date: 2025-06-24JIANGSU OUMEI STEEL STRUCTURE CURTAIN WALL
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202421844064.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-31
Publication Date
2025-06-24
Estimated Expiration
2034-07-31

AI Technical Summary

Technical Problem

Traditional spraying devices have problems such as many blind spots, low treatment efficiency and high pollution to the working environment when spraying steel structures.

Method used

A steel structure spray drying device is designed, including a mounting shed, a load assembly, a spray assembly, a drying assembly and a pumping assembly. The paint outlet of the spraying assembly is evenly distributed on the inner wall of the processing channel, the heating source of the drying assembly is evenly distributed on the inner wall of the drying area, the air outlet of the exhaust assembly is located in the processing channel, and the door curtain and track system are used to reduce blind spots and contamination.

Benefits of technology

This device can effectively reduce the blind spots of spraying treatment, improve the treatment effect, and reduce the pollution of spraying paint droplets and exhaust gases to the working environment.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN223010941U_ABST
    Figure CN223010941U_ABST
Patent Text Reader

Abstract

The utility model relates to a steel structure spraying and drying device which comprises a mounting shed, a loading assembly, a spraying assembly, a drying assembly and an air exhaust assembly, a processing channel is arranged in the mounting shed, door curtains are arranged at openings in the left end and the right end of the processing channel and at the junction of a spraying area and a drying area respectively, and the spraying assembly, the drying assembly and the air exhaust assembly are arranged on the mounting shed. A pair of rails in the left-right direction are symmetrically arranged at the bottom of the machining channel in the front-back direction, moving devices are arranged on the rails, a carrying assembly is connected between the moving devices and comprises a carrying plate used for containing the steel structure, the carrying plate can rotate on the horizontal plane around a center shaft in the vertical direction, and a rotating rod in the vertical direction is connected to the center of the bottom of the carrying plate. A gear is arranged at the lower end of the rotating rod, a vertical plate parallel to the rails is arranged between the two rails, and a rack meshed with the gear is arranged on the vertical plate in the length direction. The device disclosed by the utility model has the advantages of few processing dead angles, good processing effect and small pollution to the working environment.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model relates to the technical field of spraying equipment, and particularly relates to a steel structure spraying and drying device. Background Art

[0002] A steel structure is a structure composed of steel materials and is one of the main building structure types. The structure is mainly composed of steel beams, steel columns, steel trusses and other components made of sections and steel plates.

[0003] In order to meet the rust prevention needs of steel structures, a spraying device is generally used to spray appropriate paint on the surface of the steel structure. Traditional spraying devices only have the painting function, and the steel structure also needs to be transferred to a corresponding drying device to dry the paint layer, which reduces efficiency. In addition, the number of paint outlets of the spraying device is limited, and the spraying direction of the paint is fixed. When spraying, the steel structure is generally in a static state, resulting in many dead corners when spraying complex steel structures, affecting the treatment effect. In addition, harmful paint droplets and waste gas will be generated during spraying, which need to be restricted and treated. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a steel structure spraying and drying device, which has the advantages of fewer processing dead corners, good treatment effect and less pollution to the working environment.

[0005] The technical solution of the utility model is as follows:

[0006] A steel structure spraying and drying device includes an installation shed, a loading component, a spraying component, a drying component and an air extraction component. A processing channel is arranged in the installation shed along the left-right direction. The interior of the processing channel is divided into a spraying area on the left side and a drying area on the right side. Curtains are respectively arranged at the openings at the left and right ends of the processing channel and at the junction of the spraying area and the drying area. The installation shed is provided with a spraying component, a drying component and an air extraction component. The paint outlets of the spraying component are evenly distributed on the inner wall of the processing channel in the spraying area. The heating sources of the drying component are evenly distributed on the inner wall of the processing channel in the drying area. The air extraction ports of the air extraction component are arranged at the top right end of the spraying area and at the top left end of the drying area. A pair of left-right rails are symmetrically arranged at the front and rear of the bottom of the processing channel. A moving device that can move along the rails is arranged on the rails. A loading component is connected between the moving devices. The loading component includes a loading plate for placing the steel structure. The loading plate can rotate on the horizontal plane around the vertical central axis. A rotating rod along the vertical direction is connected to the center of the bottom of the loading plate. A gear is arranged at the lower end of the rotating rod. A vertical plate parallel to the rails is arranged between the two rails. A rack meshing with the gear is arranged along the length direction of the vertical plate.

[0007] Preferably, the load-carrying assembly further includes a fixing plate. The front and rear ends of the fixing plate are respectively connected to the moving device. A circular groove is provided at the top of the fixing plate. An annular protrusion and a through hole located at the center are provided concentrically in the circular groove. The outer and inner surfaces of the annular protrusion are each provided with rollable balls evenly along the circumference. The load-carrying plate is located above the fixing plate. A cylindrical protrusion is provided in the middle of the bottom of the load-carrying plate. An annular groove and a rotating rod located at the center are provided at the bottom of the protrusion. Rotatable supporting wheels are evenly provided along the circumference of the outer wall of the protrusion. The protrusion is placed into the circular groove. The supporting wheels are in rolling contact with the bottom of the circular groove. The annular protrusion is placed into the annular groove. The balls on the annular protrusion are in rolling contact with the inner wall of the annular groove. The rotating rod passes through the through hole. A bearing is provided on the through hole. The through hole is rotationally connected to the rotating rod through the bearing.

[0008] Preferably, a plurality of slideways A in the front-back direction are evenly provided at the top of the load-carrying plate in the left-right direction. A plurality of supporting plates in the left-right direction are provided above the slideways A. A slider A slidably connected to the slideway A is provided at the bottom of the supporting plate. A fixing screw A that can be rotated to abut against the inner wall of the slideway A is threadedly connected to the slider A. A slideway B is provided along the length direction at the top of the supporting plate. Two sliders B are slidably connected to the slideway B. A fixing screw B that can be rotated to abut against the inner wall of the slideway B is threadedly connected to the slider B.

[0009] Preferably, the spraying assembly includes a main liquid delivery pipe, liquid delivery branch pipes and liquid distribution pipes. The main liquid delivery pipe is provided on the installation shed. The inlet end of the main liquid delivery pipe is communicated with the paint source. Liquid delivery branch pipes are evenly provided on the main liquid delivery pipe. The liquid delivery branch pipes penetrate into the processing channel. A plurality of liquid distribution pipes are evenly provided along the left-right direction on the inner wall of the processing channel in the spraying area. The shape of the liquid distribution pipe is equivalent to the outer contour shape of the cross-section of the processing channel. The liquid distribution pipes correspond to the liquid delivery branch pipes one by one. The middle of the liquid distribution pipe is communicated with the liquid delivery branch pipe. Nozzles are evenly provided on the inner surface of the liquid distribution pipe. The nozzles serve as the paint outlets of the spraying assembly.

[0010] Preferably, the drying assembly is composed of a plurality of heating pipes. The heating pipes are evenly distributed on the inner wall of the processing channel in the drying area.

[0011] Preferably, the air extraction assembly includes an air extraction main pipe, two air extraction branch pipes and an air extraction pump. The air extraction main pipe and the air extraction branch pipes are provided on the installation shed. The inlet ends of the two air extraction branch pipes are respectively communicated with the top right end of the spraying area and the top left end of the drying area. The outlet ends of the air extraction branch pipes are communicated with the same air extraction main pipe. The air extraction main pipe is communicated with the waste gas treatment device. An air extraction pump for sending air to the waste gas treatment device is provided on the air extraction main pipe.

[0012] The beneficial technical effects of the present utility model are:

[0013] 1. The installation shed is provided with a spraying component and a drying component. The steel structure can be successively subjected to spraying treatment and drying treatment in the processing channel. The paint outlets of the spraying component are evenly distributed on the processing channel, reducing dead corners and having a good treatment effect. Most of the paint droplets and waste gas generated during processing are restricted within the processing channel by the curtain. The paint droplets will sink to the bottom under the influence of their own weight, and the waste gas is extracted from the processing channel by the air extraction component, reducing the pollution of the paint droplets and waste gas to the surrounding working environment. The paint outlets of the spraying component and the heating source of the drying component are evenly distributed on the inner wall of the processing channel, reducing the dead corners of the spraying treatment and drying treatment and improving the treatment effect. The air extraction port of the air extraction component is arranged at one end of the spraying area and the drying area away from the opening of the processing channel, driving the paint droplets and waste gas to move towards the inner side of the processing channel and reducing the probability of pollution overflow. A curtain is provided at the junction of the spraying area and the drying area, reducing the interference between the spraying treatment and the drying treatment with each other.

[0014] 2. Through the combined use of the rotating rod, gear and rack, when the load-carrying component moves along the track with the moving device, the load-carrying plate and the steel structure on the load-carrying plate rotate on the horizontal plane, further reducing the dead corners of the spraying treatment and drying treatment and improving the treatment effect. When the load-carrying component moves with the moving device, the gear moving with the load-carrying component rotates under the action of the rack meshing with it. The rotating gear drives the load-carrying plate to rotate through the rotating rod, thereby driving the steel structure on the load-carrying plate to rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The technical solution of the present utility model will be further described below with reference to the accompanying drawings.

[0016] Attached Figure 1 is the front perspective sectional view of the present utility model.

[0017] Attached Figure 2 is Figure 1 the enlarged view of part A of

[0018] Attached Figure 3 is the left perspective sectional view of the present utility model.

[0019] Attached Figure 4 is the top view of the present utility model.

[0020] Attached Figure 5 is the top view of the load-carrying plate.

[0021] Attached Figure 6 is the top view of the fixing plate.

[0022] In the figure: 1 - installation shed, 2 - load-carrying component, 3 - spraying component, 4 - drying component, 5 - air extraction component, 6 - processing channel, 7 - curtain, 8 - track, 9 - moving device, 10 - load-carrying plate, 11 - rotating rod, 12 - gear, 13 - vertical plate, 14 - rack, 15 - fixing plate, 16 - circular groove, 17 - annular protrusion, 18 - through hole, 19 - ball, 20 - protruding part, 21 - supporting wheel, 22 - bearing, 23 - slideway A, 24 - slider A, 25 - fixing screw A, 26 - support plate, 27 - slideway B, 28 - slider B, 29 - fixing screw B, 30 - main infusion pipe, 31 - infusion branch pipe, 32 - liquid distribution pipe, 33 - nozzle, 34 - heating pipe, 35 - main air extraction pipe, 36 - air extraction branch pipe, 37 - air extraction pump. Detailed implementation manners

[0023] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] Embodiment:

[0025] As Figures 1 to 6 shown, this embodiment provides a steel structure spraying and drying device, including an installation shed 1, a load-carrying component 2, a spraying component 3, a drying component 4 and an air extraction component 5. A processing channel 6 is provided in the installation shed 1 and arranged in the left-right direction. The interior of the processing channel 6 is divided into a spraying area on the left side and a drying area on the right side. Curtains 7 are respectively provided at the openings at the left and right ends of the processing channel 6 and at the junction of the spraying area and the drying area. The installation shed 1 is provided with a spraying component 3, a drying component 4 and an air extraction component 5. The paint outlets of the spraying component 3 are evenly distributed on the inner wall of the processing channel 6 in the spraying area, the heating sources of the drying component 4 are evenly distributed on the inner wall of the processing channel 6 in the drying area, and the air extraction ports of the air extraction component 5 are arranged at the top right end of the spraying area and the top left end of the drying area. A pair of tracks 8 in the left-right direction are symmetrically provided at the front and rear of the bottom of the processing channel 6. A moving device 9 that can move along the track 8 is provided on the track 8. A load-carrying component 2 is connected between the moving devices 9. The load-carrying component 2 includes a load-carrying plate 10 for placing the steel structure. The load-carrying plate 10 can rotate on the horizontal plane around the vertical central axis. A rotating rod 11 in the vertical direction is connected to the center of the bottom of the load-carrying plate 10. A gear 12 is provided at the lower end of the rotating rod 11. A vertical plate 13 parallel to the track 8 is provided between the two tracks 8. A rack 14 meshing with the gear 12 is provided along the length direction of the vertical plate 13.

[0026] The installation shed 1 is provided with a spraying component 3 and a drying component 4. The steel structure can be successively subjected to spraying treatment and drying treatment in the processing channel 6. The paint outlets of the spraying component 3 are evenly distributed on the processing channel, reducing dead corners and having a good treatment effect. Most of the paint droplets and waste gas generated during processing are restricted within the processing channel 6 by the curtain 7. The paint droplets will sink to the bottom under the influence of their own weight, and the waste gas is extracted from the processing channel 6 by the air extraction component 5, reducing the pollution of the droplets and waste gas to the surrounding working environment. The paint outlets of the spraying component 3 and the heating source of the drying component 4 are evenly distributed on the inner wall of the processing channel 6, reducing the dead corners of the spraying treatment and drying treatment and improving the treatment effect. The air extraction port of the air extraction component 5 is arranged at one end of the spraying area and the drying area away from the opening of the processing channel 6, driving the droplets and waste gas to move towards the inner side of the processing channel 6 and reducing the probability of pollution overflow. A curtain 7 is arranged at the junction of the spraying area and the drying area, reducing the interference between the spraying treatment and the drying treatment. Through the combined use of the rotating rod 11, the gear 12 and the rack 14, when the loading component 2 moves along the track 8 with the moving device 9, the loading plate 10 and the steel structure on the loading plate 10 rotate on the horizontal plane, further reducing the dead corners of the spraying treatment and drying treatment and improving the treatment effect. When the loading component 2 moves with the moving device 9, the gear 12 that moves with the movement of the loading component 2 rotates under the action of the rack 14 meshing with it. The rotating gear 12 drives the loading plate 10 to rotate through the rotating rod 11, thereby driving the steel structure on the loading plate 10 to rotate.

[0027] Furthermore, the loading component 2 further includes a fixing plate 15. The front and rear ends of the fixing plate 15 are respectively connected to the moving device 9. A circular groove 16 is provided at the top of the fixing plate 15. An annular protrusion 17 and a through hole 18 located at the center are provided inside the circular groove 16. The outer and inner surfaces of the annular protrusion 17 are each provided with rollable balls 19 along the circumference. The loading plate 10 is located above the fixing plate 15. A cylindrical protrusion 20 is provided in the middle of the bottom of the loading plate 10. An annular groove and a rotating rod 11 located at the center are provided at the bottom of the protrusion 20. Rotatable support wheels 21 are evenly provided on the outer wall of the protrusion 20 along the circumference. The protrusion 20 is placed inside the circular groove 16, and the support wheels 21 are in rolling contact with the bottom of the circular groove 16. The annular protrusion 17 is placed inside the annular groove, and the balls 19 on the annular protrusion 17 are in rolling contact with the inner wall of the annular groove. The rotating rod 11 passes through the through hole 18, and a bearing 22 is provided on the through hole 18. The through hole 18 is rotationally connected to the rotating rod 11 through the bearing 22.

[0028] The fixing plate 15 provides a support platform for the loading plate 10. Through the combined use of the annular protrusion 17 and the annular groove, and the through hole 18 and the rotating rod 11, the rotational connection between the loading plate 10 and the fixing plate 15 is realized. Through the balls 19, the support wheels 21 and the bearing 22, the friction between the loading plate 10 and the fixing plate 15 is reduced, making the rotation of the loading plate 10 smoother.

[0029] Further, a number of sliding channels A23 in the front-rear direction are evenly provided at the top of the loading plate 10 in the left-right direction. Above the sliding channels A23, a number of supporting plates 26 in the left-right direction are provided. At the bottom of the supporting plate 26, there are sliding blocks A24 slidably connected to the sliding channels A23. On the sliding block A24, there is a fixing screw A25 that can be rotated to abut against the inner wall of the sliding channel A23. Along the length direction at the top of the supporting plate 26, there is a sliding channel B27. Two sliding blocks B28 are slidably connected to the sliding channel B27. On the sliding block B28, there is a fixing screw B29 that can be rotated to abut against the inner wall of the sliding channel B27.

[0030] By the combined use of the sliding channel A23 and the sliding block A24, the supporting plate 26 is given the ability to change its position on the fixing plate 15 in the front-rear direction, providing a support point with a suitable position for steel structures of different sizes, with flexible adjustment. By the combined use of the sliding channel B27 and the sliding block B28, the effect that the steel structure part on the corresponding supporting plate 26 can be clamped by two mutually closing sliding blocks B28 can be achieved, avoiding the steel structure from slipping off the supporting plate 26 during the processing. After the sliding block A24 and the sliding block B28 move to the predetermined positions, the corresponding fixing screw A25 and fixing screw B29 can be tightened to fix the positions, with convenient operation.

[0031] Further, the spraying assembly 3 includes an infusion main pipe 30, infusion branch pipes 31, and a liquid distribution pipe 32. The infusion main pipe 30 is provided on the installation shed 1. The inlet end of the infusion main pipe 30 is communicated with the paint source. The infusion main pipe 30 is evenly provided with infusion branch pipes 31. The infusion branch pipes 31 penetrate into the processing channel 6. On the inner wall of the processing channel 6 in the spraying area, a number of liquid distribution pipes 32 are evenly provided in the left-right direction. The shape of the liquid distribution pipe 32 is equivalent to the outer contour shape of the cross-section of the processing channel 6. The liquid distribution pipes 32 correspond to the infusion branch pipes 31 one by one. The middle part of the liquid distribution pipe 32 is communicated with the infusion branch pipe 31. On the inner surface facing inwards of the liquid distribution pipe 32, a number of nozzles 33 are evenly provided. The nozzles 33 serve as the paint outlets of the spraying assembly 3.

[0032] The paint supplied by the paint source reaches each nozzle 33 along the infusion main pipe 30, infusion branch pipes 31, and liquid distribution pipes 32, and finally forms a paint mist sprayed towards the middle at the nozzles 33 to spray and process the passing steel structure.

[0033] Further, the drying assembly 4 is composed of a number of heating pipes 34, and the heating pipes 34 are evenly distributed on the inner wall of the processing channel 6 in the drying area.

[0034] When the drying process is carried out, the heating pipes 34 are started to dry the paint layer on the surface of the steel structure.

[0035] Further, the air extraction assembly 5 includes an air extraction main pipe 35, two air extraction branch pipes 36 and an air extraction pump 37. The air extraction main pipe 35 and the air extraction branch pipes 36 are provided on the installation shed 1. The inlet ends of the two air extraction branch pipes 36 are respectively communicated with the top right end of the spraying area and the top left end of the drying area. The outlet end of the air extraction branch pipe 36 is communicated with the same air extraction main pipe 35. The air extraction main pipe 35 is communicated with the waste gas treatment device, and an air extraction pump 37 for sending air to the waste gas treatment device is provided on the air extraction main pipe 35.

[0036] When exhausting waste gas, start the air extraction pump 37. The waste gas in the spraying area and the drying area is sent to the corresponding waste gas treatment device through the air extraction branch pipes 36 and the air extraction main pipe 35, and is discharged to the outside after environmental protection treatment.

[0037] The working principle and usage process of the present utility model are as follows:

[0038] Adjust the position of the pallet 26 according to the size of the steel structure, tighten the fixing screw A 25. After placing the steel structure on the pallet 26, adjust the position of the slider B 28 to clamp the steel structure, and then tighten the fixing screw B 29. Start the moving device 9 to drive the steel structure through the processing channel 6 from left to right. The steel structure is spray-treated in the spraying area and dried in the drying area. During this period, the air extraction pump 37 pumps the waste gas in the processing channel 6 to the waste gas treatment device. The processed steel structure abuts against the right end of the processing channel 6. The staff unlocks the slider B 28 and pulls it open, and finally removes the loosened steel structure.

[0039] The above is only a specific application example of the present utility model, and does not constitute any limitation to the protection scope of the present utility model. Any technical solutions formed by equivalent transformation or equivalent substitution fall within the scope of the rights protection of the present utility model.

Claims

1. A steel structure spray drying device, characterized in that: The utility model comprises an installation shed, a loading assembly, a spraying assembly, a drying assembly and an exhaust assembly, wherein a processing channel arranged along the left and right directions is arranged in the installation shed, wherein the processing channel is divided into a spraying area located on the left and a drying area located on the right, and door curtains are respectively arranged at the openings at the left and right ends of the processing channel and at the junction of the spraying area and the drying area, and the installation shed is provided with a spraying assembly, a drying assembly and an exhaust assembly, the paint outlet of the spraying assembly is evenly distributed on the inner wall of the processing channel in the spraying area, the heating source of the drying assembly is evenly distributed on the inner wall of the processing channel in the drying area, and the exhaust of the exhaust assembly The opening is arranged at the top right end of the spraying area and the top left end of the drying area. A pair of tracks along the left and right directions are symmetrically arranged at the bottom of the processing channel. A moving device that can move along the track is provided on the track. A carrier assembly is connected between the moving devices. The carrier assembly includes a carrier plate for placing a steel structure. The carrier plate can rotate on a horizontal plane around a central axis in the vertical direction. A rotating rod along the vertical direction is connected to the center of the bottom of the carrier plate. A gear is provided at the lower end of the rotating rod. A vertical plate parallel to the track is provided between the two tracks. The vertical plate is provided with a rack meshing with the gear along the length direction.

2. A steel structure spray drying device according to claim 1, characterized in that: The loading assembly also includes a fixed plate, the front and rear ends of the fixed plate are respectively connected to the moving device, the top of the fixed plate is provided with a circular groove, the circular groove is provided with concentric annular protrusions and a through hole in the center, the outward and inward surfaces of the annular protrusion are respectively provided with rollable balls evenly along the circumference, the loading plate is located above the fixed plate, a cylindrical protrusion is provided in the middle of the bottom of the loading plate, the bottom of the protrusion is provided with concentric annular grooves and a rotating rod in the center, the outer wall of the protrusion is evenly provided with rotatable supporting wheels along the circumference, the protrusion is placed in the circular groove, the supporting wheel is rollingly abutted against the bottom of the circular groove, the annular protrusion is placed in the annular groove, the balls on the annular protrusion are rollingly abutted against the inner wall of the annular groove, the rotating rod passes through the through hole, the through hole is provided with a bearing, and the through hole is rotatably connected to the rotating rod via the bearing.

3. A steel structure spray drying device according to claim 1, characterized in that: A plurality of slideways A along the front-back direction are evenly arranged on the top of the loading plate along the left-right direction, a plurality of support plates along the left-right direction are arranged above the slideways A, a slider A slidably connected to the slideway A is arranged at the bottom of the support plate, a fixing screw A which can be screwed to the inner wall of the slideway A is threadedly connected to the slider A, a slideway B is arranged on the top of the support plate along the length direction, two sliders B are slidably connected to the slideway B, and a fixing screw B which can be screwed to the inner wall of the slideway B is threadedly connected to the slider B.

4. A steel structure spray drying device according to claim 1, characterized in that: The spraying assembly includes an infusion main pipe, an infusion branch pipe and a distribution pipe. The installation shed is provided with an infusion main pipe, the inlet end of the infusion main pipe is connected to the paint source, the infusion branch pipes are evenly arranged on the infusion main pipe, the infusion branch pipes penetrate into the processing channel, and the processing channel is evenly provided with a plurality of distribution pipes along the left and right directions on the inner wall of the spraying area. The shape of the distribution pipe is equivalent to the outer contour shape of the cross-section of the processing channel. The distribution pipe corresponds to the infusion branch pipe one by one, the middle part of the distribution pipe is connected to the infusion branch pipe, and nozzles are evenly arranged on the inner surface of the distribution pipe, and the nozzles serve as the paint outlet of the spraying assembly.

5. The steel structure spray drying device according to claim 1, characterized in that: The drying assembly is composed of a plurality of heating tubes, and the heating tubes are evenly distributed on the inner wall of the processing channel in the drying area.

6. A steel structure spray drying device according to claim 1, characterized in that: The exhaust assembly includes an exhaust main pipe, two exhaust branches and an exhaust pump. The installation shed is provided with an exhaust main pipe and an exhaust branch pipe. The inlet ends of the two exhaust branch pipes are respectively connected to the right end top of the spraying area and the left end top of the drying area. The outlet ends of the exhaust branch pipes are connected to the same exhaust main pipe. The exhaust main pipe is connected to the exhaust gas treatment device. The exhaust main pipe is provided with an exhaust pump for supplying air to the exhaust gas treatment device.