Chlorosulfonic acid cooling device

Abstract

The utility model relates to the technical field of chlorosulfonic acid production, in particular to a chlorosulfonic acid cooling device, which not only prevents cooling water from participating in cooling of a chlorosulfonic acid solution and avoids the possibility of leakage of the chlorosulfonic acid solution and water reaction explosion, but also improves the cooling speed by adopting two cooling modes of air cooling and oil cooling on the chlorosulfonic acid solution. Comprising a cooling mechanism; the device further comprises a material conveying mechanism, an air cooling mechanism, a heat exchange mechanism and a heat dissipation mechanism, the material conveying mechanism is installed on the cooling mechanism and conveys chlorosulfonic acid into the cooling mechanism, the air cooling mechanism is installed on the material conveying mechanism and conducts air cooling on chlorosulfonic acid, and the heat exchange mechanism is installed on the air cooling mechanism and conducts circulating cooling on air. The heat dissipation mechanism is installed on the material conveying mechanism and cools air.

Description

Technical Field

[0001] The utility model relates to the technical field of chlorosulfonic acid production, in particular to a chlorosulfonic acid cooling device. Background Art

[0002] Chlorosulfonic acid is a colorless or light yellow liquid with a pungent odor. It is mainly used for the sulfonation of organic compounds to produce medicines, dyes, pesticides, detergents, etc.

[0003] Existing chlorosulfonic acid cooling devices, such as the one disclosed in utility model patent application number 200920281976.5, mainly include a heat exchanger, a feed pipe and a discharge pipe respectively provided at both ends of the heat exchanger, a cooling pipe installed in the heat exchanger, one end of the cooling pipe communicating with a water inlet pipe and an air outlet pipe, and the other end of the cooling pipe communicating with a packing tower, a packing layer provided in the packing tower, a water outlet pipe provided at the bottom of the packing tower, a blow pipe installed on the water outlet pipe, the blow pipe connected to a fan, and the water outlet pipe communicating with a water inlet pipe via a water supply pipe, which is provided with a water pump. During use, cooling water enters the liquid separator through the water inlet pipe, is evenly separated, and flows into each cooling pipe. Simultaneously, the fan blows air into the cooling pipe, and the water and air mix to form a falling film absorption heat exchange to cool the chlorosulfonic acid.

[0004] However, chlorosulfonic acid is a strong oxidant that decomposes violently or even explodes when in contact with water. Most existing cooling devices use water for cooling, which is very dangerous if a leak occurs. In addition, cooling the chlorosulfonic acid solution only once takes a long time and has low work efficiency. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a chlorosulfonic acid cooling device which not only avoids the participation of cooling water in the cooling of the chlorosulfonic acid solution, thus avoiding the possibility of explosion caused by leakage of the chlorosulfonic acid solution and reaction with water, but also implements both air cooling and oil cooling for the chlorosulfonic acid solution, thereby improving the cooling speed.

[0006] The utility model discloses a chlorosulfonic acid cooling device, which comprises a cooling mechanism, a feeding mechanism, an air cooling mechanism, a heat exchanging mechanism and a heat dissipating mechanism. The feeding mechanism is installed on the cooling mechanism and feeds chlorosulfonic acid into the cooling mechanism, the air cooling mechanism is installed on the feeding mechanism and air-cools the chlorosulfonic acid, the heat exchanging mechanism is installed on the air cooling mechanism and circulates and cools the air, and the heat dissipating mechanism is installed on the feeding mechanism and cools the air. The feeding mechanism sprays a chlorosulfonic acid solution into the cooling mechanism, the air cooling mechanism is started to air-cool the chlorosulfonic acid solution, the cooled chlorosulfonic acid solution is cooled again by cooling oil in the cooling mechanism, the air used for air cooling enters the heat exchanging mechanism to dissipate heat, and the heat dissipating mechanism is started to cool the air in the heat exchanging mechanism, and the cooled air continues to enter the air cooling mechanism to cool the chlorosulfonic acid solution.

[0007] Preferably, the cooling mechanism includes an oil cooling box, an air cooling box, an oil pipeline, valve one, a heat exchange pipe and valve two, the bottom end of the oil cooling box is connected to the ground, a cavity is provided inside the oil cooling box, the bottom end of the air cooling box is connected to the top of the oil cooling box, an inner cavity is provided inside the air cooling box, the bottom end of the oil pipeline is communicated with the inner top of the oil cooling box, valve one is installed on the oil pipeline, the heat exchange pipe is installed in the cavity of the oil cooling box and communicated with the bottom end of the inner cavity of the air cooling box, and valve two is installed on the heat exchange pipe; open valve one, and the cooling oil is transported to the cavity of the oil cooling box through the oil pipeline, and the chlorosulfonic acid solution cooled by air in the inner cavity of the air cooling box enters the heat exchange pipe, and the cooling oil in the cavity of the oil cooling box cools the chlorosulfonic acid solution in the heat exchange pipe for secondary cooling, and then open valve two to discharge the chlorosulfonic acid solution in the heat exchange pipe.

[0008] Preferably, the inner wall of the air-cooled box is coated with an anti-corrosion coating; since chlorosulfonic acid solution is highly corrosive, by coating the inner wall of the air-cooled box with the anti-corrosion coating, the chlorosulfonic acid solution is prevented from corroding the air-cooled box, thereby extending the service life of the device.

[0009] Preferably, the feeding mechanism includes a reducer, an electric motor, a pump body, a connecting pipe, a feeding pipe and a spray head, the bottom end of the reducer is connected to the top of the air-cooled box, the bottom end of the motor is connected to the top of the reducer, the bottom end of the pump body is connected to the top of the reducer, the connecting pipe is installed on the pump body, the feeding pipe is installed on the pump body, and the spray head is installed in the inner cavity of the air-cooled box and communicated with the inside of the feeding pipe; the motor is started, and the motor drives the pump body to pump liquid through the reducer, and the chlorosulfonic acid solution is pumped out through the connecting pipe, and then transported to the spray head through the feeding pipe. The spray head sprays the chlorosulfonic acid solution in the inner cavity of the air-cooled box, thereby increasing the heat dissipation area of ​​the chlorosulfonic acid solution and accelerating the heat dissipation and cooling of the chlorosulfonic acid solution.

[0010] Preferably, the air cooling mechanism includes a pump body 2, an air inlet pipe, a valve 3, an air supply pipe and a check valve 1. The bottom end of the pump body 2 is connected to the top of the air cooling box, the air inlet pipe is installed on the pump body 2, the valve 3 is installed on the air inlet pipe, the air supply pipe is installed on the pump body 2 and is connected to the inside of the cavity of the air cooling box, and the check valve 1 is installed on the air supply pipe; the reducer drives the pump body 2 to exhaust air, opens the valve 3, and the air inlet pipe delivers the filtered air into the pump body 2, and the pump body 2 delivers the air to the inner cavity of the air cooling box through the air supply pipe to cool and dissipate the sprayed chlorosulfonic acid solution. The valve 3 is set to prevent the air in the heat exchange mechanism from being discharged again through the air inlet pipe, and the check valve 1 is set to prevent the air in the inner cavity of the air cooling box from flowing back again.

[0011] Preferably, the heat exchange mechanism includes two groups of water baffles, a heat dissipation pipe, two groups of brackets and a second check valve, the two groups of water baffles are installed in the inner cavity of the air-cooled box, the heat dissipation pipe is installed on the air-cooled box and communicated with the inner cavity of the air-cooled box, the two groups of brackets are installed on the air-cooled box and connected to the heat dissipation pipe, and the second check valve is installed on the heat dissipation pipe; the air in the inner cavity of the air-cooled box enters the heat dissipation pipe, and the two groups of water baffles are provided to prevent the chlorosulfonic acid solution in the cavity of the air-cooled box from overflowing with the air, and the two groups of brackets are provided to enhance the stability of the heat dissipation pipe, and the air in the heat dissipation pipe enters the intake pipe again for circulation after being cooled by the heat dissipation mechanism, and the second check valve is provided to prevent the air in the intake pipe from being reversely transported to the bracket.

[0012] Preferably, the heat dissipation mechanism includes a transmission shaft, a pulley 1, two sets of rotating shafts, three sets of pulley 2, a first belt, a second belt, a tensioner and two sets of cooling fans. The transmission shaft is rotatably mounted on the reducer, the pulley 1 is mounted on the transmission shaft, the two sets of rotating shafts are mounted on the oil cooling box, two sets of pulley 2 are mounted on the upper rotating shaft, a set of pulley 2 is mounted on the lower rotating shaft, the first belt is tensioned and mounted between the pulley 1 and the pulley 2 on the upper rotating shaft, the second belt is tensioned and mounted between the two sets of pulleys 2 on the two sets of rotating shafts, and the tensioner is mounted on the oil cooling box. The two sets of cooling fans are respectively installed on the two sets of rotating shafts; the reducer drives the transmission shaft to rotate, the transmission shaft drives pulley one to rotate, pulley one drives pulley two connected to it to rotate through the first belt, pulley two drives the rotating shaft connected to it to rotate, the rotating shaft drives another set of pulley two connected to it to rotate, pulley two drives another set of pulley two and the rotating shaft to rotate through the second belt, the two sets of rotating shafts drive the two sets of cooling fans to rotate, the two sets of cooling fans dissipate heat and cool the heat pipes, accelerate the air flow on the surface of the heat pipes, and the first belt and the second belt are kept in a tensioned state by setting a tensioner.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the feeding mechanism sprays the chlorosulfonic acid solution into the cooling mechanism, the air cooling mechanism is started to air-cool the chlorosulfonic acid solution, the cooled chlorosulfonic acid solution is cooled again by cooling oil in the cooling mechanism, the air used for air cooling enters the heat exchange mechanism to dissipate heat, and at the same time the heat dissipation mechanism is started to cool the air in the heat exchange mechanism, and the cooled air continues to enter the air cooling mechanism to cool the chlorosulfonic acid solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is an axonometric structural diagram of the present utility model;

[0015] Figure 2 This is a schematic diagram of the front cross-sectional structure of the cooling mechanism and the feeding mechanism of the utility model;

[0016] Figure 3It is a partially enlarged isometric structural diagram of the feeding mechanism, heat exchange mechanism and heat dissipation mechanism of the utility model;

[0017] Figure 4 This is a partially enlarged axonometric structural diagram of the air cooling mechanism of the utility model;

[0018] Figure 5 It is a partially enlarged axonometric structural diagram of the heat dissipation mechanism of the utility model.

[0019] Markings in the accompanying drawings: 01, cooling mechanism; 11, oil cooling box; 12, air cooling box; 13, oil pipeline; 14, valve one; 15, heat exchange pipe; 16, valve two; 02, feeding mechanism; 21, reducer; 22, electric motor; 23, pump body one; 24, connecting pipe; 25, feeding pipe; 26, sprinkler head; 03, air cooling mechanism; 31, pump body two; 32, air intake pipe; 33, valve three; 34, air supply pipe; 35, check valve one; 04, heat exchange mechanism; 41, water baffle; 42, heat dissipation pipe; 43, bracket; 44, check valve two; 05, heat dissipation mechanism; 51, transmission shaft; 52, pulley one; 53, rotating shaft; 54, pulley two; 55, first belt; 56, second belt; 57, tensioner; 58, cooling fan. DETAILED DESCRIPTION

[0020] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention. Example

[0021] The utility model discloses a chlorosulfonic acid cooling device, comprising a cooling mechanism 01; a feeding mechanism 02, an air cooling mechanism 03, a heat exchanging mechanism 04 and a heat dissipating mechanism 05, wherein the feeding mechanism 02 is mounted on the cooling mechanism 01 and transports the chlorosulfonic acid into the cooling mechanism 01, the air cooling mechanism 03 is mounted on the feeding mechanism 02 and air-cools the chlorosulfonic acid, the heat exchanging mechanism 04 is mounted on the air cooling mechanism 03 and circulates and cools the air, and the heat dissipating mechanism 05 is mounted on the feeding mechanism 02 and cools the air; the cooling mechanism 01 comprises an oil cooling box 11, an air cooling box 12, an oil delivery pipe 13, a valve 14, a heat exchange pipe 15 and valve 2 16, the bottom end of the oil cooling box 11 is connected to the ground, the interior of the oil cooling box 11 is provided with a cavity, the bottom end of the air cooling box 12 is connected to the top of the oil cooling box 11, the interior of the air cooling box 12 is provided with an inner cavity, the bottom end of the oil delivery pipe 13 is connected to the top interior of the oil cooling box 11, valve 14 is installed on the oil delivery pipe 13, the heat exchange pipe 15 is installed in the cavity of the oil cooling box 11 and is connected to the bottom end of the inner cavity of the air cooling box 12, and valve 2 16 is installed on the heat exchange pipe 15; the inner wall of the air cooling box 12 is also coated with anti-corrosion paint; the feeding mechanism 02 includes a reducer 21, a motor 22, a pump body 2 3. Connecting pipe 24, feeding pipe 25 and spray head 26. The bottom end of reducer 21 is connected to the top of air cooling box 12, the bottom end of motor 22 is connected to the top of reducer 21, the bottom end of pump body 1 23 is connected to the top of reducer 21, connecting pipe 24 is installed on pump body 1 23, feeding pipe 25 is installed on pump body 1 23, spray head 26 is installed in the inner cavity of air cooling box 12 and communicates with the inside of feeding pipe 25; air cooling mechanism 03 includes pump body 2 31, air inlet pipe 32, valve 3 33, air feed pipe 34 and check valve 1 35. The bottom end of pump body 2 31 is connected to the top of air cooling box 12, air inlet pipe 32, valve 3 33, air feed pipe 34 and check valve 1 35. The pipe 32 is installed on the second pump body 31, the third valve 33 is installed on the air inlet pipe 32, the air supply pipe 34 is installed on the second pump body 31 and is connected to the interior of the cavity of the air cooling box 12, and the first check valve 35 is installed on the air supply pipe 34; the heat exchange mechanism 04 includes two groups of water baffles 41, a heat dissipation pipe 42, two groups of brackets 43 and a second check valve 44, the two groups of water baffles 41 are installed in the inner cavity of the air cooling box 12, the heat dissipation pipe 42 is installed on the air cooling box 12 and is connected to the inner cavity of the air cooling box 12, the two groups of brackets 43 are installed on the air cooling box 12 and connected to the heat dissipation pipe 42, and the second check valve 44 is installed on the heat dissipation pipe 42;When it is working, first, the motor 22 is started, and the motor 22 drives the pump body 1 23 to pump liquid through the reducer 21, and the chlorosulfonic acid solution is extracted through the connecting pipe 24, and then transported to the spray head 26 through the feeding pipe 25. The spray head 26 sprays the chlorosulfonic acid solution into the inner cavity of the air-cooled box 12, thereby increasing the heat dissipation area of ​​the chlorosulfonic acid solution and accelerating the heat dissipation and cooling of the chlorosulfonic acid solution. The reducer 21 drives the pump body 2 31 to pump air, and the valve 33 is opened. The air inlet pipe 32 transports the filtered air into the pump body 2 31, and the pump body 2 31 transports the air into the inner cavity of the air-cooled box 12 through the air supply pipe 34, so as to cool and dissipate the sprayed chlorosulfonic acid solution. The air in the heat exchange mechanism 04 is prevented from being discharged again through the air inlet pipe 32 by setting the valve 33, and the check valve 1 is set. 35 prevents the air in the inner cavity of the air-cooled box 12 from flowing back. The air-cooled chlorosulfonic acid solution in the inner cavity of the air-cooled box 12 enters the heat exchange tube 15. The cooling oil in the cavity of the oil-cooled box 11 secondarily cools the chlorosulfonic acid solution in the heat exchange tube 15. Then, valve 2 16 is opened to discharge the chlorosulfonic acid solution in the heat exchange tube 15. The air in the inner cavity of the air-cooled box 12 enters the heat dissipation tube 42. Two sets of water baffles 41 are provided to prevent the chlorosulfonic acid solution in the cavity of the air-cooled box 12 from overflowing with the air. Two sets of brackets 43 are provided to enhance the stability of the heat dissipation tube 42. After being cooled by the heat dissipation mechanism 05, the air in the heat dissipation tube 42 re-enters the intake pipe 32 for circulation. A check valve 2 44 is provided to prevent the air in the intake pipe 32 from being reversely transported into the bracket 43. Example

[0022] like Figures 1 to 5As shown, a chlorosulfonic acid cooling device of the present invention is based on Example 1; the heat dissipation mechanism 05 includes a transmission shaft 51, a pulley 1 52, two sets of rotating shafts 53, three sets of pulley 2 54, a first belt 55, a second belt 56, a tensioner 57 and two sets of cooling fans 58, the transmission shaft 51 is rotatably mounted on the reducer 21, the pulley 1 52 is mounted on the transmission shaft 51, the two sets of rotating shafts 53 are mounted on the oil cooling box 11, two sets of pulley 2 54 are mounted on the upper rotating shaft 53, and a set of pulley 2 54 is mounted on the lower rotating shaft 53. The first belt 55 is tensioned between the pulley 1 52 and the pulley 2 54 on the upper rotating shaft 53, and the second belt 56 is tensioned between the two sets of pulley 2 54 on the two sets of rotating shafts 53. The tensioner 57 is mounted on the oil cooling box 11, and the two sets of cooling fans 58 are respectively mounted on the two sets of rotating shafts 53;When it is working, first, the motor 22 is started, and the motor 22 drives the pump body 1 23 to pump liquid through the reducer 21, and the chlorosulfonic acid solution is extracted through the connecting pipe 24, and then transported to the spray head 26 through the feeding pipe 25. The spray head 26 sprays the chlorosulfonic acid solution into the inner cavity of the air cooling box 12, thereby increasing the heat dissipation area of ​​the chlorosulfonic acid solution and accelerating the heat dissipation and cooling of the chlorosulfonic acid solution. The reducer 21 drives the pump body 2 31 to pump air, opens the valve 33, and the air inlet pipe 32 transports the filtered air into the pump body 2 31. The pump body 2 31 passes the air through the air supply pipe 3 4 is transported to the inner cavity of the air cooling box 12 to cool and dissipate the sprayed chlorosulfonic acid solution. The air in the heat exchange mechanism 04 is prevented from being discharged again through the air inlet pipe 32 by setting the valve three 33. The air in the inner cavity of the air cooling box 12 is prevented from flowing back again by setting the check valve one 35. The chlorosulfonic acid solution cooled by the air in the inner cavity of the air cooling box 12 enters the heat exchange tube 15. The cooling oil in the cavity of the oil cooling box 11 cools the chlorosulfonic acid solution in the heat exchange tube 15 for a second time. Then the valve two 16 is opened to discharge the chlorosulfonic acid solution in the heat exchange tube 15. The air in the inner cavity of the box 12 enters the heat dissipation pipe 42. By setting two sets of water baffles 41, the chlorosulfonic acid solution in the cavity of the air-cooled box 12 is prevented from overflowing with the air. By setting two sets of brackets 43, the stability of the heat dissipation pipe 42 is enhanced. The reducer 21 drives the transmission shaft 51 to rotate. The transmission shaft 51 drives the pulley 1 52 to rotate. The pulley 1 52 drives the pulley 2 54 connected thereto to rotate through the first belt 55. The pulley 2 54 drives the rotating shaft 53 connected thereto to rotate. The rotating shaft 53 drives another set of pulleys 2 54 connected thereto to rotate. Pulley 54 rotates another set of pulleys 54 and shaft 53 via a second belt 56. The two shafts 53 rotate two sets of cooling fans 58, which cool the heat pipes 42 and accelerate air flow across the surfaces of the heat pipes 42. A tensioner 57 maintains tension on the first and second belts 55, 56. After being cooled by the heat dissipation mechanism 05, the air in the heat pipes 42 recirculates into the intake pipe 32. A check valve 44 prevents the air in the intake pipe 32 from being reversely transported into the bracket 43.

[0023] The reducer 21, the motor 22, the pump body 1 23 and the pump body 2 31 of the utility model are purchased on the market. The technicians in this industry only need to install and operate them according to the accompanying instruction manual without the need for creative work by the technicians in this field.

[0024] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A chlorosulfonic acid cooling device, comprising a cooling mechanism (01); characterized in that: The invention also includes a feeding mechanism (02), an air cooling mechanism (03), a heat exchange mechanism (04) and a heat dissipation mechanism (05). The feeding mechanism (02) is installed on the cooling mechanism (01) and transports chlorosulfonic acid into the cooling mechanism (01). The air cooling mechanism (03) is installed on the feeding mechanism (02) and air-cools the chlorosulfonic acid. The heat exchange mechanism (04) is installed on the air cooling mechanism (03) and circulates and cools the air. The heat dissipation mechanism (05) is installed on the feeding mechanism (02) and cools the air.

2. A chlorosulfonic acid cooling device according to claim 1, characterized in that: The cooling mechanism (01) includes an oil cooling box (11), an air cooling box (12), an oil delivery pipe (13), a valve 1 (14), a heat exchange pipe (15) and a valve 2 (16). The bottom end of the oil cooling box (11) is connected to the ground, a cavity is provided inside the oil cooling box (11), the bottom end of the air cooling box (12) is connected to the top end of the oil cooling box (11), an inner cavity is provided inside the air cooling box (12), the bottom end of the oil delivery pipe (13) is communicated with the inner top end of the oil cooling box (11), the valve 1 (14) is installed on the oil delivery pipe (13), the heat exchange pipe (15) is installed in the cavity of the oil cooling box (11) and is communicated with the bottom end of the inner cavity of the air cooling box (12), and the valve 2 (16) is installed on the heat exchange pipe (15).

3. A chlorosulfonic acid cooling device according to claim 2, characterized in that, The inner wall of the air cooling box (12) is coated with an anti-corrosion paint.

4. A chlorosulfonic acid cooling device according to claim 2, characterized in that: The feeding mechanism (02) includes a reducer (21), an electric motor (22), a pump body (23), a connecting pipe (24), a feeding pipe (25) and a spray head (26). The bottom end of the reducer (21) is connected to the top end of the air-cooling box (12), the bottom end of the electric motor (22) is connected to the top end of the reducer (21), the bottom end of the pump body (23) is connected to the top end of the reducer (21), the connecting pipe (24) is installed on the pump body (23), the feeding pipe (25) is installed on the pump body (23), and the spray head (26) is installed in the inner cavity of the air-cooling box (12) and communicated with the inside of the feeding pipe (25).

5. A chlorosulfonic acid cooling device according to claim 2, characterized in that: The air cooling mechanism (03) includes a second pump body (31), an air inlet pipe (32), a third valve (33), an air supply pipe (34) and a first check valve (35). The bottom end of the second pump body (31) is connected to the top end of the air cooling box (12). The air inlet pipe (32) is installed on the second pump body (31). The third valve (33) is installed on the air inlet pipe (32). The air supply pipe (34) is installed on the second pump body (31) and is connected to the interior of the cavity of the air cooling box (12). The first check valve (35) is installed on the air supply pipe (34).

6. A chlorosulfonic acid cooling device according to claim 2, characterized in that: The heat exchange mechanism (04) includes two groups of water baffles (41), a heat dissipation pipe (42), two groups of brackets (43) and a second check valve (44). The two groups of water baffles (41) are installed in the inner cavity of the air cooling box (12). The heat dissipation pipe (42) is installed on the air cooling box (12) and communicates with the inner cavity of the air cooling box (12). The two groups of brackets (43) are installed on the air cooling box (12) and connected to the heat dissipation pipe (42). The second check valve (44) is installed on the heat dissipation pipe (42).

7. A chlorosulfonic acid cooling device according to claim 3, characterized in that: The heat dissipation mechanism (05) includes a transmission shaft (51), a pulley 1 (52), two sets of rotating shafts (53), three sets of pulley 2 (54), a first belt (55), a second belt (56), a tensioner (57) and two sets of cooling fans (58). The transmission shaft (51) is rotatably mounted on the reducer (21), the pulley 1 (52) is mounted on the transmission shaft (51), and the two sets of rotating shafts (53) are mounted on the oil cooling box (11). The rotating shaft (53) located above is mounted with Two sets of pulleys (54) are installed on the lower rotating shaft (53), a first belt (55) is tensioned between the pulley (52) and the pulley (54) on the upper rotating shaft (53), a second belt (56) is tensioned between the two sets of pulleys (54) on the two sets of rotating shafts (53), a tensioner (57) is installed on the oil cooling box (11), and two sets of cooling fans (58) are respectively installed on the two sets of rotating shafts (53).

Images