Frame polishing dust purification treatment device

Abstract

The invention discloses a vehicle frame polishing dust purification treatment device, and relates to the technical field of dust removal equipment. Comprising a purification box; the dust filtering assembly and the spraying pipe assembly are sequentially arranged in the purifying box in parallel; the dust suction pipe is arranged outside the purification box and communicates with the dust filtering assembly. The dust filtering assembly comprises a partition plate vertically arranged in the purification box, an air inlet disc is rotationally embedded in the partition plate, a suction fan communicated with the dust suction pipe is embedded in the side wall, close to the dust suction pipe, of the purification box, and circulating filtering cloth is arranged between the suction fan and the air inlet disc; the spraying pipe assembly comprises a plurality of spraying bases vertically arranged on the top face, away from the air inlet disc end, of the purifying box at intervals, the tops of the spraying bases are flush, the heights of the spraying bases are sequentially decreased, and a plurality of spraying heads are arranged on the spraying bases. The device has the advantages that dust is doubly purified through filtering and spraying, and the purification effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of dust removal equipment, and particularly relates to a device for purifying and treating dust generated during the grinding of a vehicle frame. Background Art

[0002] After the vehicle frame is welded, it needs to be ground to remove burrs, sharp corners and other defects generated during welding. Inevitably, a large amount of dust will be generated during the grinding process. If the grinding dust is not treated in time, it will seriously pollute the working environment and directly damage the respiratory system of the human body. People who are in this working environment for a long time are prone to respiratory diseases, which seriously endanger the physical health of relevant workers. Summary of the Invention

[0003] Aiming at the above-mentioned existing technical deficiencies, the purpose of the present invention is to provide a device for purifying and treating dust generated during the grinding of a vehicle frame, which has the advantages of double purification of dust through filtration and spraying, and improves the purification effect.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions: The present invention provides a device for purifying and treating dust generated during the grinding of a vehicle frame, including: A purification box; A dust filtration component; A spray pipe component. The dust filtration component and the spray pipe component are arranged in parallel in the purification box in sequence; A suction pipe is arranged outside the purification box and is connected to the dust filtration component; Among them, the dust filtration component includes a partition vertically arranged in the purification box. An air inlet disk is rotatably embedded in the partition. A suction fan connected to the suction pipe is embedded in the side wall of the purification box close to the suction pipe. A circulating filter cloth is arranged between the suction fan and the air inlet disk; The spray pipe component includes a plurality of spray seats vertically and spaced apart on the top surface of the end of the purification box away from the air inlet disk. The tops of the spray seats are flush, and the heights of the spray seats decrease in sequence. A plurality of nozzles are arranged on the spray seats. A water tank with a water pump is arranged outside the purification box and is connected to the spray seats. A water collection and exhaust box is embedded in the bottom surface of the purification box and is connected to the water tank with the water pump.

[0005] Preferably, a driving motor is arranged outside the purification box. A driving gear is arranged on the output shaft of the driving motor. The air inlet disk is rotatably arranged in the partition through a support rod. A gear ring meshing with the driving gear is arranged outside the air inlet disk. The driving motor drives the air inlet disk to rotate, so that the air inlet through holes at different positions on the air inlet disk can achieve air inlet, reduce or avoid blockage, and also make the air inlet uniform, which is convenient for subsequent purification treatment.

[0006] Preferably, one end of the air inlet disc close to the spray seat penetrates to the outside of the partition board, and the toothed ring is sleeved on the end of the air inlet disc penetrating to the outside of the partition board, which is convenient for the driving motor to drive the air inlet disc to rotate.

[0007] Preferably, the dust suction pipe includes: An outer pipe, which is arranged on the outer wall of the purification box, and one end of the outer pipe in the length direction is open and penetrates the outer wall of the purification box, and the suction fan is located in the opening where the outer pipe penetrates the outer wall of the purification box; A telescopic pipe, which is communicated with the other end opening of the outer pipe in the length direction; A dust suction hood, which is communicated with the end of the telescopic pipe far from the outer pipe. It is convenient to pull the dust suction hood to the corresponding position as needed, and at the same time, the telescopic pipe can be telescopically adjusted accordingly, which is convenient for dust suction.

[0008] Preferably, the circulating filter cloth includes: A winding roller; A unwinding roller, the winding roller and the unwinding roller are arranged at intervals from top to bottom between the suction fan and the air inlet disc; A filter cloth, the two ends of the filter cloth in the length direction are respectively wound around the outer parts of the winding roller and the unwinding roller, and the filter cloth is in contact with the opening at one end of the outer pipe in the length direction. It is convenient for the circulating filter cloth to collect dust after being used for a period of time. The winding roller drives the filter cloth to wind, and at the same time, the unwinding roller drives the filter cloth to unwind, which is convenient to use a new section of the filter cloth on the unwinding roller, avoiding blockage and improving the filtering effect at the same time.

[0009] Preferably, a plurality of air inlet through holes are evenly distributed along the circumferential direction on the air inlet disc. The driving motor drives the air inlet disc to rotate, so that dust can enter through the air inlet through holes at different positions on the air inlet disc, which is beneficial to the uniformity of dust entering the position of the spray pipe assembly, and thus beneficial to improving the spray effect.

[0010] Preferably, the height of the spray seat close to the air inlet disc is less than the height of the spray seat far from the air inlet disc, which is convenient for dust to flow through the end of the spray seat close to the nozzle, which is beneficial to spraying the dust and removing the particles in the dust.

[0011] Preferably, the top surface of the water collection and exhaust box is open. There are three spray seats. Two baffles are arranged side by side and at intervals on the top surface opening of the water collection and exhaust box, and the bottom surfaces of the baffles are flush. The top surface of the baffle close to the air inlet disc is flush with the bottom surface of the spray seat at the middle position, and the top surface of the baffle far from the air inlet disc is flush with the bottom surface far from the air inlet disc, which is convenient for dust to flow between the bottom surface of the spray seat and the top surface of the baffle, which is beneficial to spraying the dust through the nozzle and removing the particles in the dust.

[0012] Preferably, a V-shaped filter plate is arranged in the top opening of the water collecting and exhaust box. A filter plate is horizontally arranged in the V-shaped opening of the V-shaped filter plate. A plurality of exhaust holes are arranged on two opposite side walls of the water collecting and exhaust box, facilitating the filtration of the water after spraying dust, and the water can be recycled.

[0013] Preferably, a box groove is arranged on the bottom surface of the purification box. The top surface of the box groove is open. The water collecting and exhaust box is movably arranged in the box groove. Two opposite outer walls of the water collecting and exhaust box and two opposite inner walls of the box groove are arranged at intervals. Hanging rods are arranged on both sides opposite to the top opening of the water collecting and exhaust box. The hanging rods are in contact with the top opening of the box groove. A plurality of exhaust through grooves are arranged at intervals along the length direction on the bottom surface of the hanging rods. Two baffles are arranged in parallel at intervals between the two hanging rods, facilitating the removal of the water collecting and exhaust box from the box groove for cleaning; meanwhile, it is also convenient for the purified gas to be discharged through the exhaust holes and the exhaust through grooves in sequence.

[0014] The beneficial effects of the present invention are as follows: 1. After the dust is filtered by the circulating filter cloth and then sprayed and purified, the purification effect of the dust is improved; under the combined action of the unwinding roller and the winding roller, the used filter cloth can be wound, and at the same time, the unused filter cloth on the unwinding roller can be located at a position corresponding to the outer pipeline, so as to prevent the filter cloth from being blocked after long-term use, and at the same time, it is not necessary to replace the filter cloth manually, improving the operation convenience and efficiency.

[0015] 2. The tops of the plurality of spray seats vertically arranged at intervals on the purification box are flush, and the heights of the spray seats decrease in sequence. At the same time, under the cooperation of the two baffle belts arranged on the top opening of the water collecting and exhaust box, the dust can flow between the bottom surface of each spray seat and the top surface of the baffle in sequence, which is beneficial to the concentration of the dust flow, facilitating the spraying of the dust by the spray head to remove the particles in the dust and improving the purification effect. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic diagram of the internal structure of a frame grinding dust purification and treatment device provided by an embodiment of the present invention.

[0018] Figure 2 For Figure 1 the enlarged schematic diagram of the structure at A in

[0019] Figure 3 Schematic diagram of the box groove position of a frame grinding dust purification and treatment device provided by an embodiment of the present invention.

[0020] Figure 4 For Figure 3 Enlarged schematic diagram of the structure at position B in

[0021] Figure 5 Schematic diagram of the water collection and exhaust box structure of a frame grinding dust purification and treatment device provided by an embodiment of the present invention.

[0022] Figure 6 Schematic diagram of the air inlet disk structure of a frame grinding dust purification and treatment device provided by an embodiment of the present invention.

[0023] Figure 7 Schematic diagram of the nozzle position of a frame grinding dust purification and treatment device provided by an embodiment of the present invention.

[0024] Figure 8 Schematic diagram of the nozzle structure of a frame grinding dust purification and treatment device provided by an embodiment of the present invention.

[0025] Explanation of reference numerals: 1, purification box; 2, dust filtration component; 21, partition board; 22, air inlet disk; 221, air inlet through hole; 23, suction fan; 24, circulating filter cloth; 241, winding roller; 242, unwinding roller; 243, filter cloth; 25, driving motor; 26, driving gear; 27, support rod; 3, spray pipe component; 31, spray base; 311, baffle; 32, nozzle; 33, water tank with water pump; 34, water collection and exhaust box; 341, V-shaped filter plate; 342, filter plate; 343, exhaust hole; 4, dust suction pipe; 41, outer pipe; 42, telescopic pipe; 43, dust suction hood; 5, box groove; 6, hanging rod; 61, exhaust through groove. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Embodiment 1 Such as Figures 1 to 3 、 Figures 6 to 8As shown in the figure, the present invention provides a frame grinding dust purification and treatment device, including a purification box 1; a dust filtration component 2 and a spray pipe component 3 are arranged in parallel in the purification box 1 in sequence; a dust suction pipe 4 is arranged outside the purification box 1, and the dust suction pipe 4 is communicated with the dust filtration component 2; the dust filtration component 2 includes a partition 21 vertically arranged in the purification box 1, an air inlet disk 22 is rotatably embedded in the partition 21, a suction fan 23 communicated with the dust suction pipe 4 is embedded in the side wall of the purification box 1 close to the dust suction pipe 4, and a circulating filter cloth 24 is arranged between the suction fan 23 and the air inlet disk 22; the spray pipe component 3 includes a plurality of spray seats 31 vertically and spacedly arranged on the top surface of the end of the purification box 1 far from the air inlet disk 22, the tops of the spray seats 31 are flush, the heights of the spray seats 31 decrease in sequence, a plurality of spray nozzles 32 are arranged on the spray seats 31, a water tank 33 with a water pump is arranged outside the purification box 1 and is communicated with the spray seats 31, and a water collection and exhaust box 34 is embedded in the bottom surface of the purification box 1, and the water collection and exhaust box 34 is communicated with the water tank 33 with a water pump.

[0028] The dust at the grinding site enters the purification box 1 through the dust suction pipe 4 under the action of the suction fan 23, and is first filtered by the circulating filter cloth 24; then it enters the position of the spray pipe component 3 through the air inlet disk 22 (that is, the dust can pass through the lower part of each spray seat 31 in sequence, which is beneficial to improving the spray treatment effect). The spray water in the water tank 33 with a water pump enters the spray seats 31 and is sprayed out through the spray nozzles 32, which can be mixed with the particles in the dust, so that the particles can fall into the water collection and exhaust box 34 for collection, achieving the purification effect, and the purified dust can be discharged through the water collection and exhaust box 34.

[0029] Embodiment Two On the basis of Embodiment One, as Figures 1 to 4 、 Figure 6 shown, a driving motor 25 is arranged outside the purification box 1, a driving gear 26 is arranged on the output shaft of the driving motor 25, the air inlet disk 22 is rotatably arranged in the partition 21 through a support rod 27, and a gear ring meshed with the driving gear 26 is arranged outside the air inlet disk 22; one end of the air inlet disk 22 close to the spray seat 31 penetrates to the outside of the partition 21, and the gear ring is sleeved on the end of the air inlet disk 22 penetrating to the outside of the partition 21, which is convenient for the driving motor 25 to drive the air inlet disk 22 to rotate; the driving motor 25 rotates to drive the driving gear 26 and the air inlet disk 22 to rotate synchronously, so that the air inlet through holes 221 at different positions on the air inlet disk 22 can intake air at different positions, reducing or avoiding the blockage phenomenon of each air inlet through hole 221, and also making the air intake uniform, which is convenient for subsequent purification treatment.

[0030] Embodiment Three On the basis of Embodiment One, as Figures 1 to 4 、 Figure 6As shown in the figure, the dust suction pipe 4 includes an outer pipe 41. The outer pipe 41 is arranged on the outer wall of the purification box 1, and one end of the outer pipe 41 in the length direction opens through the outer wall of the purification box 1. The suction fan 23 is located in the opening where the outer pipe 41 penetrates the outer wall of the purification box 1; the telescopic pipe 42 is communicated with the other end opening of the outer pipe 41 in the length direction; the dust suction hood 43 is communicated with the end of the telescopic pipe 42 far from the outer pipe 41; the circulating filter cloth 24 includes a winding roller 241; the winding roller 241 and the unwinding roller 242 are arranged at intervals from top to bottom between the suction fan 23 and the air inlet disc 22; both ends of the filter cloth 243 in the length direction are respectively wound around the outside of the winding roller 241 and the unwinding roller 242, and the filter cloth 243 is in contact with the opening at one end of the outer pipe 41 in the length direction.

[0031] Before the dust purification treatment, according to the position where the dust needs to be inhaled, the dust suction hood 43 can be pulled to the corresponding position. At the same time, the telescopic pipe 42 can be telescopically adjusted accordingly to improve the dust suction effect; the dust can be inhaled by the dust suction hood 43, and then successively pass through the telescopic pipe 42 and the outer pipe 41 and enter the purification box 1. First, it passes through the filter cloth 243 for filtration, that is, when entering the purification box 1 through the outer pipe 41, it will pass through the filter cloth 243 for filtration, and a part of the particulate dust can be filtered out. When the filter cloth 243 is used for a period of time, dust will accumulate. The winding roller 241 drives the filter cloth 243 to wind up, and at the same time, the unwinding roller 242 drives the filter cloth 243 to unwind (that is, the used filter cloth 243 is wound up, and at the same time, the unused filter cloth 243 on the unwinding roller 242 can be located at the position corresponding to the outer pipe 41), so as to prevent the filter cloth 243 from being blocked after long-term use and affecting the filtration effect. At the same time, it is not necessary for workers to replace the filter cloth 243, which improves the operation convenience and efficiency.

[0032] A plurality of air inlet through holes 221 are evenly distributed along the circumference of the air inlet disc 22; the driving motor 25 can drive the air inlet disc 22 to rotate, so that the dust can enter through the air inlet through holes 221 at different positions on the air inlet disc 22, which is beneficial to the uniformity of the dust entering the position of the spray pipe assembly 3, and thus is beneficial to improving the spray effect; a filter screen can be arranged in the air inlet through hole 221, and the mesh number of the filter screen is larger than that of the filter cloth 243, which is convenient for filtering particles with different diameters in sequence, improves the filtration effect, and at the same time can avoid or reduce the blockage of the filter cloth 243 and the air inlet through holes 221.

[0033] Embodiment Four On the basis of Embodiment One, as Figures 1 to 3 、 Figure 7As shown in the figure, the height of the spray seat 31 close to the air inlet disc 22 is less than the height of the spray seat 31 far from the air inlet disc 22; the top surface of the water collecting and exhaust box 34 is open. There are three spray seats 31. Two baffles 311 are arranged in parallel and at intervals on the open top surface of the water collecting and exhaust box 34, and the bottom surfaces of the baffles 311 are flush. The top surface of the baffle 311 close to the air inlet disc 22 is flush with the bottom surface of the spray seat 31 at the middle position, and the top surface of the baffle 311 far from the air inlet disc 22 is flush with the bottom surface far from the air inlet disc 22.

[0034] The dust can flow to the position corresponding to the spray pipe assembly 3 after being filtered by the dust filtering assembly 2, that is, the dust can flow successively between the bottom surface of each spray seat 31 and the top surface of the baffle 311, which can make the dust flow concentrated. That is, when the dust flows out through the air inlet through hole 221 on the air inlet disc 22, it first passes under the spray seat 31 close to the air inlet disc 22 for spraying; then it flows to the lower part of the spray seat 31 at the middle position (the baffle 311 close to the air inlet disc 22 can play a certain blocking role on the dust, which is beneficial to make the dust flow concentratedly from under the baffle 311 close to the air inlet disc 22), and then it flows to the lower part of the spray seat 31 far from the air inlet disc 22 (the baffle 311 far from the air inlet disc 22 can play a certain blocking role on the dust, which is convenient to make the dust flow concentratedly from under the baffle 311 far from the air inlet disc 22); it is beneficial to spray the dust through the nozzle 32 to remove the particles in the dust.

[0035] Embodiment Five On the basis of Embodiment One, as Figure 1 、 Figures 3 to 4 、 Figure 5 shown in the figure, a V-shaped filter plate 341 is arranged in the open top surface of the water collecting and exhaust box 34. A filter plate 342 is horizontally arranged in the V-shaped opening of the V-shaped filter plate 341. A plurality of exhaust holes 343 are arranged on both opposite side walls of the water collecting and exhaust box 34; a box groove 5 is arranged in the bottom surface of the purification box 1, and the top surface of the box groove 5 is open. The water collecting and exhaust box 34 is movably arranged in the box groove 5. The two opposite outer walls of the water collecting and exhaust box 34 and the two opposite inner walls of the box groove 5 are arranged at intervals. Hanging rods 6 are arranged on both opposite sides of the open top surface of the water collecting and exhaust box 34. The hanging rods 6 are in contact with the open top surface of the box groove 5. A plurality of exhaust through grooves 61 are arranged at intervals along the length direction on the bottom surface of the hanging rod 6. The two baffles 311 are arranged in parallel and at intervals between the two hanging rods 6.

[0036] The dust after being sprayed by the spray pipe assembly 3 can fall onto the filter plate 342 within the V-shaped opening of the V-shaped filter plate 341 along with the spray water. After being filtered successively through the filter plate 342 and the V-shaped filter plate 341, it flows into the water collection and exhaust box 34 for storage. The gas in the water collection and exhaust box 34 after filtering the dust can be discharged to the outside of the box groove 5 successively through the exhaust holes 343 on the side wall of the water collection and exhaust box 34 and the exhaust through groove 61 (when the water collection and exhaust box 34 is installed in the box groove 5, the hanging rod 6 contacts the top opening of the box groove 5, so as to seal the top opening of the box groove 5, and thus the gas in the water collection and exhaust box 34 is discharged to the outside of the box groove 5 successively through the exhaust holes 343 on the side wall of the water collection and exhaust box 34 and the exhaust through groove 61).

[0037] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and modifications therein.

Claims

1. A frame grinding dust purification and treatment device, characterized in that Comprising: Purification box (1); Dust filtration component (2); Spray pipe component (3), the dust filtration component (2) and the spray pipe component (3) are arranged side by side in sequence in the purification box (1); Suction pipe (4), the suction pipe (4) is arranged outside the purification box (1), and the suction pipe (4) is communicated with the dust filtration component (2); Among them, the dust filtration component (2) includes a partition plate (21) vertically arranged in the purification box (1), an air inlet disk (22) is rotatably embedded in the partition plate (21), and an air suction fan (23) communicated with the suction pipe (4) is embedded in the side wall of the purification box (1) close to the suction pipe (4), and a circulating filter cloth (24) is arranged between the air suction fan (23) and the air inlet disk (22); The spray pipe component (3) includes a plurality of spray seats (31) vertically and spacedly arranged on the top surface of the end of the purification box (1) far from the air inlet disk (22), the tops of the spray seats (31) are flush, the heights of the spray seats (31) decrease in sequence, a plurality of spray nozzles (32) are arranged on the spray seats (31), a water tank (33) with a water pump is arranged outside the purification box (1) and communicated with the spray seats (31), and a water collecting and exhaust box (34) is embedded in the bottom surface of the purification box (1), and the water collecting and exhaust box (34) is communicated with the water tank (33) with a water pump.

2. The dust purification treatment device for frame grinding as described in claim 1, characterized in that, A driving motor (25) is arranged outside the purification box (1), a driving gear (26) is arranged on the output shaft of the driving motor (25), the air inlet disk (22) is rotatably arranged in the partition plate (21) through a support rod (27), and a gear ring meshing with the driving gear (26) is arranged outside the air inlet disk (22).

3. The dust purification treatment device for frame grinding according to claim 2, characterized in that, One end of the air inlet disk (22) close to the spray seat (31) penetrates to the outside of the partition plate (21), and the gear ring is sleeved on the end of the air inlet disk (22) penetrating to the outside of the partition plate (21).

4. The dust purification treatment device for frame grinding according to claim 1, characterized in that, The suction pipe (4) includes: Outer pipe (41), the outer pipe (41) is arranged on the outer wall of the purification box (1), and one end of the outer pipe (41) in the length direction is open and penetrates through the outer wall of the purification box (1), and the air suction fan (23) is located in the opening where the outer pipe (41) penetrates through the outer wall of the purification box (1); Expansion pipe (42), the expansion pipe (42) is communicated with the other end opening of the outer pipe (41) in the length direction; Suction hood (43), the suction hood (43) is communicated with the end of the expansion pipe (42) far from the outer pipe (41).

5. The dust purification treatment device for frame grinding according to claim 4, characterized in that, The circulating filter cloth (24) includes: Take-up roller (241); Pay-off roller (242), the take-up roller (241) and the pay-off roller (242) are arranged at intervals from top to bottom between the air suction fan (23) and the air inlet disk (22); Filter cloth (243), both ends of the filter cloth (243) in the length direction are respectively wound outside the take-up roller (241) and the pay-off roller (242), and the filter cloth (243) is in contact with the opening at one end of the outer pipe (41) in the length direction.

6. The dust purification treatment device for frame grinding as described in claim 4, wherein, A plurality of air inlet through holes (221) are evenly distributed along the circumference on the air inlet disk (22).

7. The dust purification treatment device for frame grinding as described in claim 1, characterized in that, The height of the spray seat (31) close to the air inlet disk (22) is less than the height of the spray seat (31) far from the air inlet disk (22).

8. The dust purification treatment device for frame grinding according to claim 7, characterized in that, The top surface of the water collecting and exhaust box (34) is open. There are three spray seats (31). Two baffles (311) are arranged in parallel and at intervals on the top surface opening of the water collecting and exhaust box (34), and the bottom surfaces of the baffles (311) are flush. The top surface of the baffle (311) close to the air inlet disc (22) is flush with the bottom surface of the spray seat (31) at the middle position, and the top surface of the baffle (311) far from the air inlet disc (22) is flush with the bottom surface far from the air inlet disc (22).

9. The dust purification treatment device for frame grinding according to claim 8, characterized in that, A V-shaped filter plate (341) is arranged in the top surface opening of the water collecting and exhaust box (34). A filter plate (342) is horizontally arranged in the V-shaped opening of the V-shaped filter plate (341). A plurality of exhaust holes (343) are arranged on the two opposite side walls of the water collecting and exhaust box (34).

10. A frame grinding dust purification and treatment device according to claim 9, characterized in that, A box groove (5) is arranged inside the bottom surface of the purification box (1). The top surface of the box groove (5) is open. The water collecting and exhaust box (34) is movably arranged in the box groove (5). The two opposite outer walls of the water collecting and exhaust box (34) and the two opposite inner walls of the box groove (5) are arranged at intervals. Hanging rods (6) are arranged on both sides opposite to the top surface opening of the water collecting and exhaust box (34). The hanging rods (6) are in contact with the top surface opening of the box groove (5). A plurality of exhaust through grooves (61) are arranged at intervals along the length direction on the bottom surface of the hanging rods (6). The two baffles (311) are arranged in parallel and at intervals between the two hanging rods (6).

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