Non-destructive scribing machine device capable of passivating

Abstract

The utility model relates to the technical field of battery piece cutting equipment, in particular to a passivation type lossless scribing machine device, which comprises a frame body, a passivation tank, a spray head, a cutting mechanism and a control display screen, the frame body is provided with a conveying belt mechanism, the passivation tank, the cutting mechanism and the control display screen, the bottom end of the passivation tank is connected with the spray head through a liquid guide pipe, and the spray head is connected with the control display screen. An electromagnetic valve is arranged on the liquid guide pipe, the electromagnetic valve is connected with one end of a control display screen through a wire, the other end of the control display screen is connected with a power source through a cable, and the output end of the spray head and the output end of the cutting mechanism face the conveying belt mechanism; the cut battery piece is subjected to passivation treatment, the cut edge of the battery piece can be passivated, recombination of current carriers is effectively reduced, and the PL brightness value becomes bright.

Description

Technical Field

[0001] The utility model relates to the technical field of battery slice cutting equipment, in particular to a passivable non-destructive dicing machine device. Background Art

[0002] The core principle of non-destructive laser scratching technology is to use laser thermal stress to control material fracture. First, a notch about 2mm long and less than 1 / 2 of the thickness of the cell is processed on both edges of the middle of the solar cell; the solar cell is locally heated quickly by laser, and locally cooled by cooling device, to produce an uneven temperature field, which will produce a temperature gradient on the surface of the solar cell, thereby inducing thermal stress; the laser spot is in a compressive stress state, while the front and back of the laser spot are in a tensile stress state. Since the solar cell is a brittle material, its compressive stiffness is much greater than the tensile strength, so when the tensile stress reaches the fracture strength of the solar cell, it will cause the solar cell to break; the fracture will start to expand steadily from the small notch initially processed on the edge of the solar cell along the moving trajectory of laser irradiation and subsequent cooling, and finally complete the cutting of the solar cell.

[0003] In the technical field, for high-efficiency TOPcon solar cells, the currently widely used damage-free laser scribing technology will reduce the efficiency of the cell by about 0.2% to 0.3%. The electrical performance of TOPcon cells of different levels will decline to varying degrees after cutting. The higher the efficiency, the greater the attenuation of cell performance after cutting. The cutting loss is mainly reflected in Voc, FF, Rs, Rsh, J02, pFF, etc. The carrier recombination phenomenon at the cutting edge is significantly increased, and the PL brightness becomes dim. Utility Model Content

[0004] The utility model aims to provide a passivable non-destructive dicing machine device to solve the problem raised in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a passivable non-destructive dicing machine device, comprising: a frame, a passivation tank, a nozzle, a cutting mechanism and a control display screen, wherein the frame is equipped with a conveyor belt mechanism, a passivation tank, a cutting mechanism and a control display screen, the bottom end of the passivation tank is connected to the nozzle through a liquid guide tube, a solenoid valve is provided on the liquid guide tube, the solenoid valve is connected to one end of the control display screen through a wire, and the other end of the control display screen is connected to a power supply through a cable, and the output ends of the nozzle and the cutting mechanism are both arranged toward the conveyor belt mechanism.

[0006] Preferably, the conveyor belt mechanism includes: a belt and a roller, each of the two ends of the frame is rotatably connected to a roller, the two rollers are connected by a belt transmission, the end of one roller is connected to the output end of the motor, and the motor is installed on the frame.

[0007] Preferably, the cutting mechanism includes: a slotting laser control box, a thermal cracking laser control box and a laser head, the frame is equipped with a slotting laser control box and a thermal cracking laser control box, the bottom end of the slotting laser control box is connected to the laser head, the bottom end of the thermal cracking laser control box is connected to the second laser head, the laser head and the second laser head are both arranged toward the top surface of the belt, and the laser head is arranged close to the input end of the belt.

[0008] Preferably, the cutting mechanism also includes: a high-temperature oxidation chamber and a gas supply control mechanism, the high-temperature oxidation chamber and the gas supply control mechanism are installed at the output end of the frame, an opening is provided on each side of the high-temperature oxidation chamber, a belt is provided in the opening, and the output end of the gas supply control mechanism is plugged into the high-temperature oxidation chamber.

[0009] Preferably, the gas supply control mechanism includes: an oxygen tank, an air duct and a controller, the oxygen tank and the controller are installed at the output end of the frame, one end of the air duct is connected to the oxygen tank, a second solenoid valve is installed on the air duct, the second solenoid valve is connected to one end of the controller through a second wire, the other end of the controller is connected to the power supply through a third wire, the other end of the air duct is connected to a sleeve, the sleeve is inserted into the mounting hole on the top surface of the high-temperature oxidation chamber, and the output end of the sleeve is arranged toward the belt.

[0010] Preferably, the sleeve includes: a tube body and a heating wire, the mounting hole is plugged into the tube body, a heating wire is arranged in the tube body, the heating wire is connected to the power supply through a second cable, the top end of the tube body is connected to the other end of the air guide tube, and the tube body is inserted into the bottom end of the high-temperature oxidation chamber and arranged toward the belt.

[0011] Preferably, an exhaust hole is opened at the bottom end of the tube body, and the inner diameter of the exhaust hole is smaller than the inner diameter of the tube body.

[0012] Preferably, a plurality of legs are mounted on the bottom end of the frame.

[0013] Preferably, a ball valve is rotatably sealed on the inner wall of the nozzle, a throttling hole is penetrated through the ball valve, the axis of the throttling hole coincides with the axis of the nozzle, one end of a rotating shaft is mounted on the side of the ball valve, the rotating shaft is rotatably connected to the steering hole on the side wall of the nozzle, a mounting shell is mounted on the side of the nozzle, a gear is mounted on the rotating shaft, the gear is arranged in the mounting shell, the gear is meshed with the rack, the rack is slidably sealed with the groove on the top surface of the mounting shell, a mounting plate is mounted on the end of the rack that passes through the top surface of the mounting shell, the mounting plate is connected to the top of the reset spring, the bottom end of the reset spring is connected to the top of the mounting shell, the bottom end of the rack is slidably sealed with the piston shell, the top of the piston shell is connected to the top of the mounting shell, a pressure reducing hole is opened on the side wall of the piston shell, the pressure reducing hole is arranged below the bottom end of the rack, and the bottom end of the piston shell is connected to the top of the exhaust pipe.

[0014] Preferably, the bottom surface of the belt is frictionally fitted with a guide wheel, the second rotating shaft of the guide wheel is rotatably installed in the air extraction shell, an air inlet is opened on one side of the air extraction shell, the air extraction shell is fixed on the frame, a plurality of paddles are installed on the second rotating shaft, and the other side of the air extraction shell is connected to the bottom end of the exhaust pipe.

[0015] The beneficial effects of the utility model are as follows:

[0016] The poly (4-styrene sulfonic acid) solution is sprayed onto the surface of the cell through a nozzle to passivate the cut cell. The cut edge of the cell can be passivated to effectively reduce the recombination of carriers and brighten the PL brightness value. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the main structure diagram of the utility model;

[0018] Figure 2 It is a partial enlarged view of the A part of the utility model;

[0019] Figure 3 It is a cross-sectional view of the nozzle of the utility model;

[0020] Figure 4 This is a schematic diagram of the installation position of the blade of the utility model;

[0021] Figure 5 This is a schematic diagram of the position of the pressure reducing hole of the utility model.

[0022] In the figure: frame 1, passivation tank 2, nozzle 3, cutting mechanism 4, control display screen 5, belt 6, roller 7, slotting laser control box 8, thermal cracking laser control box 9, laser head 10, high temperature oxidation chamber 11, gas supply control mechanism 12, oxygen tank 13, air guide tube 14, controller 15, sleeve 16, tube body 17, heating wire 18, exhaust hole 19, ball valve 20, gear 21, rack 22, return spring 23, guide wheel 24, paddle 25, exhaust pipe 26, pressure relief hole 27. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Example 1: Reference Figure 1 and Figure 3 A passivable non-destructive dicing machine device comprises: a frame 1, a passivation tank 2, a nozzle 3, a cutting mechanism 4 and a control display screen 5. The frame 1 is equipped with a conveyor belt mechanism, a passivation tank 2, a cutting mechanism 4 and a control display screen 5. The bottom end of the passivation tank 2 is connected to the nozzle 3 through a liquid guide tube. The liquid guide tube is provided with an electromagnetic valve. The electromagnetic valve is connected to one end of the control display screen 5 through a wire. The other end of the control display screen 5 is connected to a power supply through a cable. The output ends of the nozzle 3 and the cutting mechanism 4 are both arranged toward the conveyor belt mechanism.

[0026] The passivation solution is a poly-4-styrene sulfonic acid solution.

[0027] The principles and beneficial effects of the above scheme are:

[0028] After placing the battery cell on the conveyor mechanism, start the conveyor mechanism to drive the battery cell to move, start the cutting mechanism 4 to cut the battery cell, and when the battery cell moves to the bottom of the nozzle 3, open the solenoid valve by controlling the display screen 5. The model of the solenoid valve is: BQY24D2-15, so that the passivation liquid in the passivation tank 2 is sprayed on the top surface of the battery cell through the liquid guide tube and the nozzle 3. The battery cell after spraying is transported out through the output end of the conveyor mechanism and finally collected uniformly;

[0029] By using poly (4-styrene sulfonic acid) solution as the passivation solution, the production cost is greatly saved;

[0030] The poly (4-styrene sulfonic acid) solution is sprayed onto the surface of the cell through a nozzle to passivate the cut cell. The cut edge of the cell can be passivated to effectively reduce the recombination of carriers and brighten the PL brightness value.

[0031] Example 2: Reference Figure 1 The conveyor belt mechanism includes: a belt 6 and a roller 7. A roller 7 is rotatably connected to each end of the frame 1. The two rollers 7 are connected through the belt 6 transmission. The end of one roller 7 is connected to the output end of the motor, and the motor is installed on the frame 1.

[0032] The principles and beneficial effects of the above scheme are:

[0033] When the battery cells are transported, the motor is started to rotate, and the output end of the motor drives a roller 7 to rotate. The two rollers 7 are connected by a belt 6, which improves the accuracy of transporting the battery cells.

[0034] Example 3: Reference Figure 1 The cutting mechanism 4 includes: a slotting laser control box 8, a thermal cracking laser control box 9 and a laser head 10. The frame 1 is equipped with the slotting laser control box 8 and the thermal cracking laser control box 9. The bottom end of the slotting laser control box 8 is connected to the laser head 10, and the bottom end of the thermal cracking laser control box 9 is connected to the second laser head. The laser head 10 and the second laser head are both arranged toward the top surface of the belt 6, and the laser head 10 is arranged close to the input end of the belt 6.

[0035] The laser head 10 and the second laser head are both PVR-502H laser heads.

[0036] The principles and beneficial effects of the above scheme are:

[0037] After being guided by the belt 6, the battery cell moves to the bottom of the laser head 10, and the slotting laser control box 8 starts the laser head 10 to slot the battery cell. After the slotted battery cell is transported by the belt 6 and moves to the bottom of the second laser head, the thermal cracking laser control box 9 starts the second laser head to cut the slotted battery cell.

[0038] By arranging the laser head 10 and the second laser head to respectively groove and cut the battery cell, the temperature of the battery cell during cutting is reduced, thereby preventing the battery cell from being deformed due to excessive surface temperature during processing.

[0039] Example 4: Reference Figure 1 The cutting mechanism 4 also includes: a high-temperature oxidation chamber 11 and a gas supply control mechanism 12. The output end of the frame 1 is equipped with a high-temperature oxidation chamber 11 and a gas supply control mechanism 12. An opening is provided on each side of the high-temperature oxidation chamber 11, and a belt 6 is provided in the opening. The output end of the gas supply control mechanism 12 is plugged into the high-temperature oxidation chamber 11.

[0040] The principles and beneficial effects of the above scheme are:

[0041] After cutting and passivation, the cell is transported by the belt 6 to the high-temperature oxidation chamber 11, where it is quickly dried by the high-temperature oxygen output by the gas supply control mechanism 12, and an oxide film is formed on the passivated surface to protect the passivation solution.

[0042] Example 5: Reference Figure 1 and Figure 2The gas supply control mechanism 12 includes: an oxygen tank 13, an air guide tube 14 and a controller 15. The oxygen tank 13 and the controller 15 are installed at the output end of the frame 1. One end of the air guide tube 14 is connected to the oxygen tank 13. A second solenoid valve is installed on the air guide tube 14. The second solenoid valve is connected to one end of the controller 15 through a second wire. The other end of the controller 15 is connected to the power supply through a third wire. The other end of the air guide tube 14 is connected to a sleeve 16, which is plugged into the mounting hole on the top surface of the high-temperature oxidation chamber 11, and the output end of the sleeve 16 is set toward the belt 6.

[0043] The principles and beneficial effects of the above scheme are:

[0044] The controller 15 is used to start the second solenoid valve. The models of the second solenoid valve and the solenoid valve are both: BQY24D2-15. The oxygen in the oxygen tank 13 is finally input into the high-temperature oxidation chamber 11 through the air guide tube 14 and the sleeve 16. The sleeve 16 is plugged into the mounting hole, and the top of the sleeve 16 is connected to the other end of the air guide tube 14, which improves the stability of the connection of the air guide tube 14.

[0045] Example 6: Reference Figure 2 The sleeve 16 includes: a tube body 17 and a heating wire 18. The mounting hole is plugged into the tube body 17. The tube body 17 is provided with a heating wire 18. The heating wire 18 is connected to the power supply through a second cable. The top end of the tube body 17 is connected to the other end of the air guide tube 14. The tube body 17 is inserted into the bottom end of the high-temperature oxidation chamber 11 and is arranged toward the belt 6.

[0046] The principles and beneficial effects of the above scheme are:

[0047] When oxygen is input into the high temperature oxidation chamber 11, the heating wire 18 heats the output oxygen, thereby improving the efficiency of oxygen heating.

[0048] Example 7: Reference Figure 2 The bottom end of the tube body 17 is provided with an exhaust hole 19 , and the inner diameter of the exhaust hole 19 is smaller than the inner diameter of the tube body 17 .

[0049] The principles and beneficial effects of the above scheme are:

[0050] During the discharge of high-temperature oxygen, since the inner diameter of the exhaust hole 19 is smaller than the inner diameter of the tube body 17, the flow rate of oxygen output can be increased.

[0051] Example 8: Reference Figure 1 The bottom end of the frame 1 is provided with a plurality of supporting legs.

[0052] The principles and beneficial effects of the above scheme are:

[0053] A plurality of legs are mounted at the bottom of the frame 1 to improve the stability of the frame 1 during operation.

[0054] Example 9: Reference Figure 3 , Figure 4 and Figure 5 The inner wall of the nozzle 3 is rotatably sealed with a ball valve 20, and a throttling hole is penetrated through the ball valve 20, and the axis of the throttling hole coincides with the axis of the nozzle 3. One end of a rotating shaft is installed on the side of the ball valve 20, and the rotating shaft is rotatably connected with the steering hole on the side wall of the nozzle 3. A mounting shell is installed on the side of the nozzle 3, and a gear 21 is installed on the rotating shaft. The gear 21 is arranged in the mounting shell, and the gear 21 is meshed and connected with a rack 22. The rack 22 is slidably sealed with the notch on the top surface of the mounting shell, and the end of the rack 22 that passes through the top surface of the mounting shell is equipped with a mounting plate, and the mounting plate is connected to the top of the reset spring 23, and the bottom end of the reset spring 23 is connected to the top of the mounting shell. The bottom end of the rack 22 is slidably sealed with the piston shell, and the top of the piston shell is connected to the top of the mounting shell. A pressure reducing hole 27 is opened on the side wall of the piston shell, and the pressure reducing hole 27 is arranged below the bottom end of the rack 22, and the bottom end of the piston shell is connected to the top of the exhaust pipe 26.

[0055] The principles and beneficial effects of the above scheme are:

[0056] Since the belt 6 can convey cells of different sizes when working, so that the cells are dried in the high-temperature oxidation chamber 11, and at the same time, it is necessary to ensure that the drying time is not too long to cause deformation of the cells, the belt 6 moves slowly when conveying cells with larger areas, and moves quickly when conveying cells with smaller areas, so as to ensure that the cut cells can be evenly covered with the passivation liquid;

[0057] The top of the exhaust pipe 26 is connected to the bottom of the piston shell, and the top of the exhaust pipe 26 is arranged toward the bottom of the rack 22. When the area of ​​the battery cell is large, the air flow output to the piston shell through the exhaust pipe 26 is small, the rack 22 rises to a low height in the piston shell, and the gear 21 meshing with the rack 22 drives the rotating shaft and the ball valve 20 to rotate a small distance. The atomization state of the passivation liquid discharged from the nozzle 3 is low, and it can be evenly dripped onto the cut battery cell. When the area of ​​the battery cell is small, the air flow output to the piston shell through the exhaust pipe 26 is large, the rack 22 rises to a large height in the piston ... The connected gear 21 drives the rotating shaft and the ball valve 20 to rotate a large distance, the atomization state of the passivation liquid discharged from the nozzle 3 is high, and it can be evenly sprayed on the cut battery cell, and the waste of the passivation liquid can be prevented; the reset spring 23 is provided to facilitate the timely reset of the rack 22 after the work is completed; by providing the pressure reducing hole 27, the mechanism damage caused by excessive pressure inside the piston shell is prevented; the battery cell with a large area requires more passivation liquid, and the battery cell with a small area requires less passivation liquid, so the atomization state of the passivation liquid sprayed by the nozzle 3 is adjusted to prevent the leakage of the passivation liquid and the waste of the passivation liquid.

[0058] Example 10: Reference Figure 3 , Figure 4 and Figure 5 The bottom surface of the belt 6 is frictionally matched with a guide wheel 24, and the second rotating shaft of the guide wheel 24 is rotatably installed in the vacuum shell. An air inlet is opened on one side of the vacuum shell. The vacuum shell is fixed on the frame 1. A plurality of paddles 25 are installed on the second rotating shaft. The other side of the vacuum shell is connected to the bottom end of the exhaust pipe 26.

[0059] The principles and beneficial effects of the above scheme are:

[0060] When the moving speed of the belt 6 is low, the guide wheel 24 drives the second rotating shaft and the paddle 25 to rotate slowly, and the air flow entering the mounting shell through the exhaust pipe 26 is small; when the moving speed of the belt 6 is high, the guide wheel 24 drives the second rotating shaft and the paddle 25 to rotate quickly, and the air flow entering the mounting shell through the exhaust pipe 26 is large, thereby reducing the setting of the power device and saving manufacturing costs.

[0061] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A passivable non-destructive dicing machine device, characterized in that: include: A frame (1) is provided on which a conveyor belt mechanism, a passivation tank (2), a cutting mechanism (4) and a control display screen (5) are mounted. The bottom end of the passivation tank (2) is connected to a nozzle (3) via a liquid guide tube. The liquid guide tube is provided with an electromagnetic valve. The electromagnetic valve is connected to one end of the control display screen (5) via a wire. The other end of the control display screen (5) is connected to a power source via a cable. The output ends of the nozzle (3) and the cutting mechanism (4) are both arranged toward the conveyor belt mechanism.

2. A passivable non-destructive dicing machine device according to claim 1, characterized in that: The conveyor belt mechanism comprises: a belt (6) and a roller (7); each of the two ends of the frame (1) is rotatably connected to a roller (7); the two rollers (7) are connected to each other through a belt (6); the end of one roller (7) is connected to the output end of a motor; and the motor is mounted on the frame (1).

3. The passivable non-destructive dicing machine device according to claim 2, characterized in that: The cutting mechanism (4) comprises: a slotting laser control box (8); the frame (1) is equipped with a slotting laser control box (8) and a thermal cracking laser control box (9); the bottom end of the slotting laser control box (8) is connected to a laser head (10); the bottom end of the thermal cracking laser control box (9) is connected to a second laser head; the laser head (10) and the second laser head are both arranged toward the top surface of the belt (6); the laser head (10) is arranged close to the input end of the belt (6).

4. The passivable non-destructive dicing machine device according to claim 3, characterized in that: The cutting mechanism (4) further comprises: a high-temperature oxidation chamber (11) and a gas supply control mechanism (12); the high-temperature oxidation chamber (11) and the gas supply control mechanism (12) are mounted at the output end of the frame (1); an opening is provided on each side of the high-temperature oxidation chamber (11); a belt (6) is provided in the opening; and the output end of the gas supply control mechanism (12) is plugged into the high-temperature oxidation chamber (11).

5. The passivable non-destructive dicing machine device according to claim 4, characterized in that: The gas supply control mechanism (12) comprises: an oxygen tank (13); the oxygen tank (13) and a controller (15) are mounted on the output end of the frame (1); one end of an air guide tube (14) is connected to the oxygen tank (13); a second electromagnetic valve is mounted on the air guide tube (14); the second electromagnetic valve is connected to one end of the controller (15) via a second wire; the other end of the controller (15) is connected to a power source via a third wire; the other end of the air guide tube (14) is connected to a sleeve (16); the sleeve (16) is plugged into a mounting hole on the top surface of the high-temperature oxidation chamber (11); and the output end of the sleeve (16) is arranged toward the belt (6).

6. The passivable non-destructive dicing machine device according to claim 5, characterized in that: The sleeve (16) comprises: a tube body (17), the mounting hole is plugged into and matched with the tube body (17), a heating wire (18) is arranged in the tube body (17), the heating wire (18) is connected to a power source via a second cable, the top end of the tube body (17) is connected to the other end of the air guide tube (14), and the tube body (17) is inserted into the bottom end of the high-temperature oxidation chamber (11) and arranged toward the belt (6).

7. The passivable non-destructive dicing machine device according to claim 6, characterized in that: The bottom end of the tube body (17) is provided with an exhaust hole (19), and the inner diameter of the exhaust hole (19) is smaller than the inner diameter of the tube body (17).

8. The passivable non-destructive dicing machine device according to claim 5, characterized in that: The bottom end of the frame (1) is provided with a plurality of supporting legs.

9. The passivable non-destructive dicing machine device according to claim 1, characterized in that: The inner wall of the spray head (3) is rotatably sealed with a ball valve (20), a throttling hole is penetrated through the ball valve (20), the axis of the throttling hole coincides with the axis of the spray head (3), one end of a rotating shaft is mounted on the side of the ball valve (20), the rotating shaft is rotatably connected to the steering hole on the side wall of the spray head (3), a mounting shell is mounted on the side of the spray head (3), a gear (21) is mounted on the rotating shaft, the gear (21) is arranged in the mounting shell, the gear (21) is meshed with a rack (22), and the rack (22) is connected to the mounting shell. The slot on the top surface is slidably sealed, the end of the rack (22) passing through the top surface of the mounting shell is equipped with a mounting plate, the mounting plate is connected to the top of the return spring (23), the bottom of the return spring (23) is connected to the top of the mounting shell, the bottom of the rack (22) is slidably sealed with the piston shell, the top of the piston shell is connected to the top of the mounting shell, the side wall of the piston shell is opened with a pressure relief hole (27), the pressure relief hole (27) is arranged below the bottom of the rack (22), and the bottom of the piston shell is connected to the top of the exhaust pipe (26).

10. The passivable non-destructive dicing machine device according to claim 8, characterized in that: The bottom surface of the belt (6) is frictionally matched with a guide wheel (24), and the second rotating shaft of the guide wheel (24) is rotatably installed in the exhaust shell. An air inlet is opened on one side of the exhaust shell. The exhaust shell is fixed on the frame (1). A plurality of paddles (25) are installed on the second rotating shaft. The other side of the exhaust shell is connected to the bottom end of the exhaust pipe (26).

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