CN212889853U

CN212889853U - Single-engine power transmission system

Info

Publication number: CN212889853U
Application number: CN202021858192.7U
Authority: CN
Inventors: 王仁鹏; 郭佳鹏; 马莹; 李鹏; 李春
Original assignee: Shaanxi Automobile Group Co Ltd
Current assignee: Shaanxi Automobile Group Co Ltd
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2021-04-06
Anticipated expiration: 2030-08-31

Abstract

The utility model discloses a single-shot power transmission system, relate to motor vehicle power transmission system technical field, many power transmission structure parallel transmission system of pure machinery of this power transmission system pioneering nature, make each transmission structure all be pure mechanical transmission, and can the autonomous working, select different combination transmission structure for use according to the actual working condition demand of washing and sweeping vehicle, satisfy whole car user demand, single-shot power transmission system simple structure has been realized simultaneously, whole car energy consumption is minimum, the emission is little, transmission process does not need energy interconversion, transmission efficiency is highest, the cost is lowest, the fault rate is low, the maintenance cost is minimum. All have outstanding economical type, feature of environmental protection, reliability and adaptability under multiple operating modes such as transition, operation, unloading, solved the washing and sweeping vehicle operating condition energy consumption height, discharge and pollute greatly, transmission system is with high costs, transmission efficiency is low, transmission system fault rate is higher, and the maintenance is with high costs the problem.

Description

Single-engine power transmission system

Technical Field

The patent of the utility model relates to a motor vehicle power transmission system technical field especially relates to a single-shot power transmission system.

Background

The conventional washing and sweeping vehicles in the market at present mostly adopt a double-engine power transmission technology of walking by a main engine of a chassis and operating by installing an auxiliary engine, so that on one hand, the whole vehicle has high energy consumption, poor fuel economy, large emission and high operating noise; and on the other hand, the production, maintenance and maintenance cost of the whole vehicle is high.

The new-energy pure electric washing and sweeping vehicle is powered by a battery, a chassis and an upper engine are omitted, and the new-energy pure electric washing and sweeping vehicle has the advantages of zero emission, insufficient endurance mileage, high production cost, high failure rate and the like.

Some manufacturers have also introduced cleaning vehicles using single-engine power transmission technology:

one is to connect a generator in series between a main engine and a gearbox, and to convert the generator into electric energy and then drive a special device to operate through a motor, and the cost of the motor and a controller is increased, the production cost is high, multiple energy conversion is needed, and the energy conversion efficiency is low.

One is through breaking the axle in the middle of the chassis transaxle final drive shaft, install the compound transfer case of specialized machinery hydraulic pressure additional, pass the power to the special device of upper portion and drive the rear axle at the same time, wherein the hydraulic pressure traveling system is with high costs, transmission efficiency is low, the fault rate is higher, and the maintenance cost increases.

One is that the transfer case device is reused to provide power for special devices such as a fan and a water pump after the power is provided by the full-power takeoff, or the transfer case device is converted into a hydraulic system to drive the special devices to operate after the full-power takeoff is provided, and the transfer case device and the hydraulic system are used for driving, so that the defects of high manufacturing cost, high failure rate and increased maintenance cost are overcome. Overall energy utilization is higher than that of a two-engine system, but the efficiency is lower from the perspective of power output transfer of a full-power takeoff alone.

One is to provide power by a full-power takeoff, a single transmission shaft is connected with a bearing seat, a gear oil pump and a fan share one belt wheel drive or the gear oil pump is arranged on a driven wheel of the fan and driven by a belt, and a power source is connected and disconnected by a pneumatic friction clutch. The bearing in one bearing block is always in a rotating state, and when the temperature is too high, the oil seal is easy to damage, so that the service life of the bearing is short; the second pneumatic friction clutch has a large-load joint power source, so that the instantaneous torque is large and the mechanical impact on a full-power takeoff is large; the three-gear oil pump cannot work independently, when unloading, the garbage can lifts and falls back, the back door is opened and closed, and the like, and the fan is in a normal running state, so that the noise is high, and the energy consumption is high; when the four-stage washing machine is used for washing vehicles, the high-pressure water pump cannot work independently, the gear oil pump and the fan run together, the noise is high, and the energy consumption is increased.

In summary, the above prior arts are not satisfactory, and it is therefore necessary to provide a technique to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model just lies in, provides a single-shot power transmission system, this kind of single-shot power transmission system pioneering nature's many power transmission structure parallel transmission system of pure machinery, and the whole car control system of cooperation is advanced makes the washing and sweeping vehicle mode of operation can switch in a flexible way, has increased substantially whole car efficiency under the multiple operating mode, all has outstanding economical, environmental protection, reliability and adaptability under multiple operating modes such as transition, operation, unloading.

In order to solve the problems in the background art, the utility model discloses a realize through following technical scheme:

a single-power transmission system comprises an engine, a flywheel shell, a gearbox, a first power takeoff, a second power takeoff, a hydraulic oil pump, a gearbox output flange, a third transmission shaft, a low-pressure water pump, a main transmission shaft, a drive axle, a high-pressure water pump, a first belt pulley, a short belt, a first clutch, a second clutch, a supporting seat, a tensioning wheel, a long belt, a second belt pulley, a high-pressure centrifugal fan, a mixed muffler, a main clutch, a second transmission shaft, a middle support, a first transmission shaft, an engine PTO output flange and a rotating mandrel, wherein the engine is fixed on a chassis frame, the parts are mutually connected and combined to form a parallel transmission system, and the system comprises a first power transmission structure for providing power for the running of the whole vehicle, a second power transmission structure for providing power for the working of the high-pressure centrifugal fan and the high-pressure water pump, a third power transmission structure for driving the working of the, The fifth power transmission structure drives the hydraulic oil pump to work and the sixth power transmission structure drives the low-pressure water pump to work.

Furthermore, the first power transmission structure comprises an engine, a flywheel shell, a gearbox output flange, a main transmission shaft and a drive axle, wherein the flywheel shell is arranged at the output end of the engine; the gearbox is connected with the engine through a flywheel shell; the output flange of the gear box is arranged at the output end of the gear box, one end of the main transmission shaft is connected with the output flange of the gear box, and the other end of the main transmission shaft is connected with the drive axle.

Furthermore, the second power transmission structure comprises an engine, an engine PTO output flange, a first transmission shaft, a middle support, a second transmission shaft, a main clutch, a supporting seat, a rotating mandrel, a second clutch and a first clutch, wherein the engine PTO output flange is arranged on the output end of the engine; the rotating sleeve of the intermediate support is arranged on the first transmission shaft and is close to the connecting flange of the second transmission shaft, the position is no more than 50mm, and the fixedly connecting end of the rotating sleeve of the intermediate support is arranged on a cross beam corresponding to the chassis frame; one end of the first transmission shaft is connected to the PTO output flange of the engine, and the other end of the first transmission shaft is connected with one end of the second transmission shaft; the main clutch is arranged at the shaft input end of the rotating mandrel, and the rotating end of the main clutch is connected with the other end of the second transmission shaft; the supporting seat is fixed on a cross beam corresponding to the chassis frame, and the rotating mandrel is arranged on the supporting seat; the second clutch and the first clutch are sequentially arranged at the shaft output end of the rotating mandrel, and the second clutch is arranged close to the supporting seat.

Furthermore, the third power transmission structure comprises a first clutch, a short belt, a first belt pulley and a high-pressure water pump, wherein the first clutch is arranged at the shaft output end of the rotating mandrel and is provided with a belt clamping groove; the first belt pulley is arranged on an input shaft of the high-pressure water pump, and the high-pressure water pump is connected with a belt clamping groove of the first clutch through a short belt.

Further, the fourth power transmission structure comprises a second clutch, a long belt, a tension pulley, a second belt pulley, a high-pressure centrifugal fan and a hybrid muffler, wherein the second clutch is arranged at the shaft output end of the rotary mandrel, is close to the supporting seat and is provided with a belt clamping groove at the end part; the second belt pulley is arranged on an input shaft of the high-pressure centrifugal fan and is connected with a belt clamping groove of the second clutch through a long belt; the tensioning wheel is arranged on the long belt; the mixed muffler is arranged at the exhaust port of the high-pressure centrifugal fan.

Furthermore, the fifth power transmission structure comprises a gearbox, a second power takeoff and a hydraulic oil pump, wherein the second power takeoff is arranged on the gearbox; and an input shaft of the hydraulic oil pump is connected to an output shaft of the power takeoff II.

Furthermore, the sixth power transmission structure comprises a gearbox, a first power takeoff, a third transmission shaft and a low-pressure water pump, wherein the first power takeoff is arranged on the gearbox; one end of the transmission shaft III is fixed on an output flange of the power takeoff I, and the other end of the transmission shaft III is fixed on an input flange of the low-pressure water pump; the low-pressure water pump is fixed on a support of the chassis frame.

Further, the fifth power transmission structure and the sixth power transmission structure are arranged on the gearbox in an interchangeable position.

Furthermore, the first clutch is a pneumatic friction plate type clutch, the engaging rotating speed is 650 rpm-750 rpm, the rotating speed of the engine is stable, the load power of the transmission system is minimum, and the service life of the first clutch is guaranteed.

Further, the first clutch is a pneumatic friction plate type clutch, the engaging rotation speed is 650 rpm-750 rpm, the second clutch is a centrifugal clutch, the engaging rotation speed is 850 rpm-1300 rpm, the main clutch is a pneumatic friction plate type clutch, the engaging rotation speed is 650 rpm-750 rpm, the first clutch is engaged, and the second clutch can be engaged after the transmission system rotates stably.

Furthermore, the first transmission shaft is a telescopic transmission shaft, the assembly positions of the second transmission shaft and the first transmission shaft are interchanged, and the middle support is arranged in the middle of the two shafts.

Compared with the prior art, the utility model discloses following profitable technological effect has:

1. the utility model provides a single-shot power transmission system, this many power transmission structure of pure machinery of power transmission system pioneering nature connect transmission system in parallel, make every transmission structure all be pure mechanical transmission, and can work alone, select different combination transmission structures for use according to the actual operating mode demand of washing and sweeping vehicle, satisfy whole car user demand, realized single-shot power transmission system simple structure simultaneously, whole car energy consumption is minimum, the emission is little, the transmission process does not need energy interconversion, transmission efficiency is the highest, the cost is the lowest, the fault rate is low, the maintenance cost is minimum. All have outstanding economic type, feature of environmental protection, reliability and adaptability under multiple operating modes such as transition, operation, unloading. The problems of high energy consumption in the working state of the washing and sweeping vehicle, large emission pollution, high cost of a transmission system, low transmission efficiency, high failure rate of the transmission system, high maintenance cost and the like are solved.

Drawings

FIG. 1 is a schematic illustration of a single-engine powertrain of the present invention;

FIG. 2 is a schematic diagram of a belt coupling arrangement for the powertrain of the present invention;

fig. 3 is a schematic view of the structure of the rotary spindle and the supporting seat of the single-engine power transmission system of the present invention.

Description of the reference numerals

1. An engine; 2. a flywheel housing; 3. a gearbox; 4. a power takeoff device I; 5. a second power takeoff; 6. a hydraulic oil pump; 7. A gearbox output flange; 8. a third transmission shaft; 9. a low-pressure water pump; 10. a main drive shaft; 11. a drive axle; 12. a high pressure water pump; 13. a first belt pulley; 14. a short belt; 15. a first clutch; 16. a second clutch; 17. a supporting seat; 18. a tension wheel; 19. a long belt; 20. a second belt pulley; 21. a high pressure centrifugal fan; 22. a hybrid muffler; 23. a main clutch; 24. a second transmission shaft; 25. a middle support; 26. a first transmission shaft; 27. an engine PTO output flange; 28. the mandrel is rotated.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to 3, a single-engine power transmission system includes an engine 1, a flywheel housing 2, a transmission case 3, a first power takeoff 4, a second power takeoff 5, a hydraulic oil pump 6, a transmission case output flange 7, a third transmission shaft 8, a low-pressure water pump 9, a main transmission shaft 10, a drive axle 11, a high-pressure water pump 12, a first belt pulley 13, a short belt 14, a first clutch 15, a second clutch 16, a support seat 17, a tension pulley 18, a long belt 19, a second belt pulley 20, a high-pressure centrifugal fan 21, a hybrid muffler 22, a main clutch 23, a second transmission shaft 24, an intermediate support 25, a first transmission shaft 26, an engine PTO output flange 27, and a rotary spindle 28. The components are connected and combined with each other to form a parallel transmission system which comprises six power transmission structures. The first transmission shaft 26 is a telescopic transmission shaft.

The first power transmission structure provides power for the running of the whole vehicle and comprises an engine 1, a flywheel shell 2, a gearbox 3, a gearbox output flange 7, a main transmission shaft 10 and a drive axle 11. The engine 1 is fixed on the chassis frame, the flywheel housing 2 is arranged on the output end of the engine 1; the gearbox 3 is connected with the engine 1 through the flywheel housing 2; the gearbox output flange 7 is arranged at the output end of the gearbox 3, one end of the main transmission shaft 10 is connected with the gearbox output flange 7, and the other end of the main transmission shaft is connected with the drive axle 11. When the automobile front axle driving device operates, the engine 1 transmits power to the flywheel housing 2, the gearbox 3, the gearbox output flange 7, the main transmission shaft 10 and the drive axle 11, and the power is transmitted to the automobile front axle part.

The second power transmission structure provides power for the work of the high-pressure centrifugal fan 21 and the high-pressure water pump 12, and comprises an engine 1, an engine PTO output flange 27, a first transmission shaft 10, a middle support 25, a second transmission shaft 16, a main clutch 23, a supporting seat 17, a rotary mandrel 28, a second clutch 16 and a first clutch 15. The engine 1 is fixed on the chassis frame, and the engine PTO output flange 27 is arranged on the output end of the engine 1; the rotating sleeve of the middle support 25 is arranged on the first transmission shaft 10, the position close to the connecting flange of the second transmission shaft 16 is no more than 50mm, and the fixed connection end of the rotating sleeve is arranged on a cross beam corresponding to the chassis frame; one end of the first transmission shaft 10 is connected to the PTO output flange 27 of the engine, and the other end of the first transmission shaft is connected with one end of the second transmission shaft 16; the main clutch 23 is arranged on the shaft input end of the rotary mandrel 28, and the rotary end of the main clutch 23 is connected with the other end of the second transmission shaft 16; the supporting seat 17 is fixed on a cross beam corresponding to the chassis frame, and the rotating mandrel 28 is arranged on the supporting seat 17; the second clutch 16 and the first clutch 15 are sequentially arranged on the shaft output end of the rotating mandrel 28, and the second clutch 16 is close to the supporting seat 17.

The third power transmission structure is used for driving the high-pressure water pump 12 to work and comprises a clutch I15, a short belt 14, a belt pulley I13 and the high-pressure water pump 12. The first clutch 15 is arranged at the shaft output end of the rotating mandrel 28 and is provided with a belt clamping groove; the first belt pulley 13 is arranged on an input shaft of the high-pressure water pump 12 and is connected with a belt clamping groove of the first clutch 15 through a short belt 14.

The fourth power transmission structure is used for driving the high-pressure centrifugal fan 21 to work and comprises a second clutch 16, a long belt 19, a tension pulley 18 and a second belt pulley 20; a high-pressure centrifugal fan 21 and a hybrid muffler 22. The second clutch 16 is arranged at the shaft output end of the rotating mandrel 28, is close to the supporting seat 17 and is provided with a belt clamping groove; the second belt pulley 20 is arranged on an input shaft of the high-pressure centrifugal fan 21 and is connected with a belt clamping groove of the second clutch 16 through a long belt 19; the tensioning wheel 18 is arranged on the long belt 19 and used for pre-tightening the long belt 19; a hybrid muffler 22 is provided at an exhaust port of the high pressure centrifugal fan 21 for reducing noise.

The fifth power transmission structure is used for driving the hydraulic oil pump 6 to work and comprises a gearbox 3, a power takeoff II 5 and the hydraulic oil pump 6. The power takeoff device II 5 is arranged on the gearbox 3; the input shaft of the hydraulic oil pump 6 is connected to the output shaft of the power takeoff II 5.

The sixth power transmission structure is used for driving the low-pressure water pump 9 to work and comprises a gearbox 3, a power takeoff I4, a transmission shaft III 8 and the low-pressure water pump 9. The power takeoff device I4 is arranged on the gearbox 3; one end of a transmission shaft III 8 is fixed on an output flange of the power takeoff I4, and the other end of the transmission shaft III is fixed on an input flange of the low-pressure water pump 9; the low-pressure water pump 9 is fixed on a support of the chassis frame.

The six power transmission structures can be arranged on the gearbox 3 in an interchangeable way, the first clutch 15 is a pneumatic friction plate type clutch, the joint rotating speed is 650 rpm-750 rpm, at the moment, the rotating speed of the engine 1 is stable, the load power of a transmission system is minimum, and the service life of the first clutch 15 is ensured. The second clutch 16 is a centrifugal clutch, the engaging speed is 850 rpm-1300 rpm, the clutch is slowly engaged, the loaded power is increased from low to high, and the 1300rpm meets the working requirement, so that the service life of the second clutch 16 is ensured, and the PTO output shaft of the engine 1 is prevented from being subjected to instantaneous large mechanical impact. The main clutch 23 is a pneumatic friction plate type clutch, the engaging speed is 650 rpm-750 rpm, the main clutch 23 is engaged, the second clutch 16 can be engaged after the transmission system rotates stably, and the longest service life of the main clutch 23 is ensured.

Example 2, this example is different from example 1 in that: the arrangement positions of the fifth power transmission structure and the sixth power transmission structure on the gearbox 3 can be interchanged, and the arrangement is more flexible.

Example 3, this example is different from example 1 in that: the first transmission shaft 26 is a telescopic transmission shaft, and the assembly positions of the second transmission shaft 24 and the first transmission shaft 26 can be interchanged, so that the arrangement is more flexible.

The working states of the washing and sweeping vehicle, such as operation, transition, unloading and vehicle washing, are analyzed as follows:

when the washing and sweeping vehicle is in a washing and sweeping operation working state, the fifth power transmission structure is started to drive the hydraulic oil pump 6 to work at idle speed, and all the working devices enter a waiting working state (such as a sweeping disc, a suction nozzle and the like); secondly, when the rotating speed of the engine 1 is 650-750 rpm, the engine is jointed with the main clutch 23, the second power transmission structure provides power preparation for the work of the high-pressure centrifugal fan 21 and the high-pressure water pump 12, at the moment, the power system has no load, and the service life of the main clutch 23 is longest; the first clutch 15 is connected, the third power transmission structure drives the high-pressure water pump 12 to work, the power of the high-pressure water pump 12 is low at the rotating speed, and the service life of the first clutch 15 is guaranteed; the rotating speed of the engine 1 is further increased to 850-1300 rpm, the second clutch 16 is slowly engaged, and the fourth power transmission structure drives the high-pressure centrifugal fan 21 to work; and finally, starting walking operation, wherein the first power transmission structure drives the whole vehicle to run, but the rotating speed of the engine 1 cannot be greater than 1800rpm under the operation working condition. The starting process and the rotating speed control ensure that the power transmission system rotates stably without mechanical impact, each part has long service life, the cleaning efficiency is high, the energy consumption of the whole vehicle is low, and the emission pollution is small.

When the washing and sweeping vehicle is in a low-pressure washing working state, firstly, the sixth power transmission structure is started to drive the low-pressure water pump 9 to work, secondly, the walking operation is started, and the first power transmission structure drives the whole vehicle to run, but the rotating speed of the engine 1 under the working condition can not be larger than 1800 rpm. The low-pressure water pump 9 is ensured to work stably and has long service life.

When the washing and sweeping vehicle is in a transition working state, only the first power transmission structure needs to be started to drive the whole vehicle to run.

When the washing and sweeping vehicle is in a discharging working state, the fifth power transmission structure is only needed to be started to drive the hydraulic oil pump 6 to work, so that the low energy consumption, the low emission and the low working noise of the whole vehicle are ensured.

When the washing and sweeping vehicle is in a vehicle washing working state, the main clutch 23 is firstly engaged, the second power transmission structure provides power for the work of the high-pressure water pump 12, the first clutch 15 is engaged, and the third power transmission structure drives the high-pressure water pump 12 to work under the idling condition, so that the low energy consumption, the small emission and the small working noise of the whole vehicle are ensured.

The embodiments given above are preferred examples for implementing the present invention, and the present invention is not limited to the above-described embodiments. Any non-essential addition and replacement made by the technical features of the technical solution of the present invention by those skilled in the art all belong to the protection scope of the present invention.

Claims

1. A single-shot power transmission system, characterized by: the engine is fixed on a chassis frame, all the parts are mutually connected and combined to form a parallel transmission system, and the parallel transmission system comprises a first power transmission structure for providing power for the running of the whole vehicle, a second power transmission structure for providing power for the working of the high-pressure centrifugal fan and the high-pressure water pump, a third power transmission structure for driving the working of the high-pressure water pump, a fourth power transmission structure for driving the working of the high-pressure centrifugal fan, The fifth power transmission structure drives the hydraulic oil pump to work and the sixth power transmission structure drives the low-pressure water pump to work.

2. The single-shot power transmission system as defined in claim 1, wherein: the first power transmission structure comprises an engine, a flywheel shell, a gearbox output flange, a main transmission shaft and a drive axle, wherein the flywheel shell is arranged at the output end of the engine; the gearbox is connected with the engine through a flywheel shell; the output flange of the gear box is arranged at the output end of the gear box, one end of the main transmission shaft is connected with the output flange of the gear box, and the other end of the main transmission shaft is connected with the drive axle.

3. The single-shot power transmission system as defined in claim 1, wherein: the second power transmission structure comprises an engine, an engine PTO output flange, a first transmission shaft, a middle support, a second transmission shaft, a main clutch, a supporting seat, a rotating mandrel, a second clutch and a first clutch, wherein the engine PTO output flange is arranged on the output end of the engine; the rotating sleeve of the intermediate support is arranged on the first transmission shaft and is close to the connecting flange of the second transmission shaft, the position is no more than 50mm, and the fixedly connecting end of the rotating sleeve of the intermediate support is arranged on a cross beam corresponding to the chassis frame; one end of the first transmission shaft is connected to the PTO output flange of the engine, and the other end of the first transmission shaft is connected with one end of the second transmission shaft; the main clutch is arranged at the shaft input end of the rotating mandrel, and the rotating end of the main clutch is connected with the other end of the second transmission shaft; the supporting seat is fixed on a cross beam corresponding to the chassis frame, and the rotating mandrel is arranged on the supporting seat; the second clutch and the first clutch are sequentially arranged at the shaft output end of the rotating mandrel, and the second clutch is arranged close to the supporting seat.

4. The single-shot power transmission system as defined in claim 1, wherein: the third power transmission structure comprises a first clutch, a short belt, a first belt pulley and a high-pressure water pump, wherein the first clutch is arranged at the shaft output end of the rotating mandrel and is provided with a belt clamping groove; the first belt pulley is arranged on an input shaft of the high-pressure water pump, and the high-pressure water pump is connected with a belt clamping groove of the first clutch through a short belt.

5. The single-shot power transmission system as defined in claim 1, wherein: the fourth power transmission structure comprises a second clutch, a long belt, a tension pulley, a second belt pulley, a high-pressure centrifugal fan and a hybrid muffler, wherein the second clutch is arranged at the shaft output end of the rotating mandrel, is close to the supporting seat and is provided with a belt clamping groove at the end part; the second belt pulley is arranged at the input end of the high-pressure centrifugal fan and is connected with a belt clamping groove of the second clutch through a long belt; the tensioning wheel is arranged on the long belt; the mixed muffler is arranged at the exhaust port of the high-pressure centrifugal fan.

6. The single-shot power transmission system as defined in claim 1, wherein: the fifth power transmission structure comprises a gearbox, a power takeoff device II and a hydraulic oil pump, wherein the power takeoff device II is arranged on the gearbox; and an input shaft of the hydraulic oil pump is connected to an output shaft of the power takeoff II.

7. The single-shot power transmission system as defined in claim 1, wherein: the sixth power transmission structure comprises a gearbox, a power takeoff I, a transmission shaft III and a low-pressure water pump, wherein the power takeoff I is arranged on the gearbox; one end of the transmission shaft III is fixed on an output flange of the power takeoff I, and the other end of the transmission shaft III is fixed on an input flange of the low-pressure water pump; the low-pressure water pump is fixed on a support of the chassis frame.

8. The single-shot power transmission system as defined in claim 1, wherein: and the fifth power transmission structure and the sixth power transmission structure are arranged on the gearbox in a position-interchanging manner.

9. The single-shot power transmission system as defined in claim 1, wherein: the first clutch is a pneumatic friction plate type clutch, the engaging rotation speed is 650-750 rpm, the second clutch is a centrifugal clutch, the engaging rotation speed is 850-1300 rpm, the main clutch is a pneumatic friction plate type clutch, the engaging rotation speed is 650-750 rpm, the first clutch is engaged, and the second clutch can be engaged after the transmission system rotates stably.

10. The single-shot power transmission system as defined in claim 1, wherein: the first transmission shaft is a telescopic transmission shaft, the assembly positions of the second transmission shaft and the first transmission shaft are interchanged, and the middle support is arranged in the middle of the two shafts.