CN108684644A - Small-sized self-walking high-clearance sprayer - Google Patents

Abstract

The present invention relates to a kind of small-sized self-walking high-clearance sprayers, are mainly used for the plant protection operation of the long-stalked crops such as cotton, corn, tobacco;Including rack, running gear, adjustable chassis, spray boom spraying system, flow control system and transmission system.Running gear includes front tread regulating device, traveling wheel Wheel space adjusting device, chassis height adjusting devices;Spray boom spraying system includes height regulating rod, spraying system and spray rod folding mechanism;In the present invention, the wheelspan of adjustable chassis and road clearance are adjustable, and wheelspan adjustable range is 1~1.6m, and road clearance adjustable range is 0.6~1m, can meet Different Crop Planting Row Distance and different growing stage plant height, passability of the raising machine in field;Be oppositely arranged nozzle up and down on the vertical sunpender of each plantation row left and right sides, spray from left and right both direction, can in long-stalked crops plant, lower part pest and disease damage effectively prevented.

Description

Small self-propelled high clearance sprayer

technical field

The invention relates to a small self-propelled high-ground-gap sprayer, in particular to a door-type spray system and an adjustable chassis for high-stalk crops, belonging to crop field management machinery.

Background technique

In the process of crop production, pests and diseases are an important cause of crop yield loss. At present, the main control measures for crop pests and diseases in my country are pesticide spraying. Therefore, the development of plant protection mechanization and the research of new plant protection technologies have become a top priority.

At present, my country's crop spraying machinery is mainly traditional manual backpack type, which is not only low in efficiency but also poor in effect. Large and medium-sized spraying machines in developed countries have matured, and there are various styles such as traction, suspension and self-propelled. A large number of advanced technologies are adopted, which are not only safe, reliable, and easy to operate, but also realize low spray volume, fine spray, less pollution, high efficacy, and high prevention efficiency, which meets the requirements of environmental protection. High, and it is difficult to adapt to my country's crop planting mode. In the middle and late stages of crop growth, the branches and leaves are luxuriant and layered, such as cotton, tobacco, corn and other crops, it is difficult for ordinary spraying machines to achieve good control effects. In addition, based on my country's national conditions, crops are planted relatively scattered, the land is small, and the row spacing of crops is not uniform, and it is difficult for existing machinery to work in the field. Therefore, it is of great significance to develop a sprayer that is effective, economical and suitable for my country's national conditions.

Contents of the invention

In order to solve the above problems, the present invention provides a small self-propelled high-gap sprayer, which can adjust the wheelbase and chassis height according to the row spacing of crops and different growth periods, so as to improve the passability of the unit in the field. In the present invention, the design of the door-type spray system can cover the liquid spray droplets to the whole crops, especially the middle and lower layers of high-stalk crops (such as cotton, tobacco, corn, etc.), so as to realize all-round three-dimensional spraying and achieve better Control effect. The whole machine is small in size, flexible and convenient, and is suitable for plant protection operations on small plots in my country.

A small self-propelled high-ground-clearance sprayer includes a frame, an adjustable chassis, a boom spray system, a flow control system and a transmission system.

The adjustable chassis includes a front wheel track adjusting device, a traveling wheel track adjusting device, and a chassis height adjusting device.

Two front wheels are symmetrically installed in the front of the frame through the front wheel mounting frame; the front wheel mounting frame is provided with a height adjustment mechanism. The front wheel mounting frame is composed of an upper column and a lower front wheel mounting frame; the front wheel height adjustment mechanism includes a lead screw and a handle; the column is composed of two steel pipes of different lengths that can be connected inside and outside; The top of the short thin steel pipe inside is provided with threads; the top of the screw is connected to the handle, and the bottom of the screw is connected to the thread; turning the handle, the screw rotates, driving the thinner steel pipe to move up and down; the bottom of the thin steel pipe is connected to the front wheel mounting frame, and the front wheel The mounting frame is used to install the front wheel; by turning the handle, adjusting the forward and reverse of the screw, the height of the column can be adjusted, thereby adjusting the ground clearance at the front of the chassis; the height adjustment mechanism cooperates with the height adjustment device of the chassis to complete the whole machine Adjustment of chassis height.

The front wheel track adjustment device includes a fixed shaft and a front wheel support shaft; two ends of the fixed shaft are respectively connected to two front wheel support shafts; the fixed shaft is two hexagonal shafts nested and installed, and the two hexagonal shafts can The depth of embedding is adjusted by sliding to adjust the distance between the two front wheel support shafts, thereby adjusting the wheel base of the two front wheels; the front wheel support shafts are installed on the front wheel mounting frame.

The walking wheel track adjusting device is symmetrically arranged on the left and right sides of the frame behind the front wheels; the walking wheel track adjusting device includes a walking wheel mounting frame, a walking wheel mounting seat, a transmission shaft and a double cross universal joint; The traveling wheel mounting frame is installed on the frame; the bottom of the traveling wheel mounting frame is movable with a traveling wheel mounting seat; at the same time, the two ends of the transmission shaft are respectively nested and connected with the traveling wheel mounting seats on both sides; the traveling wheel mounting seat is used for It is used to install the traveling wheels; the inner side of each traveling wheel is connected with double cross universal joints; the two double cross universal joints are installed on the transmission shaft; the transmission shafts are two hexagonal shafts nested and installed, which can slide relative to adjust the embedding depth , to adjust the distance between two double cross universal joints; by adjusting the distance between two double cross universal joints, adjust the wheelbase between the road wheels; Adjustable within 1.6m.

The chassis height adjustment device includes a height adjustment seat and a lead screw; the height adjustment seat is installed on the road wheel mounting frame; the height adjustment seat and the road wheel mounting seat are vertically symmetrically installed on the road wheel mounting frame; The wheel mounting seat moves simultaneously on the traveling wheel mounting frame; the left and right positions of the height adjusting seat and the traveling wheel mounting seat on the traveling wheel mounting frame are adjustable. Each road wheel is connected with a chain transmission mechanism; the chain transmission mechanism includes a sprocket mounting plate, sprocket I, sprocket II and chain; the chain transmission mechanism is fixed on the road wheel mounting seat through the sprocket mounting plate; The sprocket I is installed on the walking wheel shaft; the sprocket II is installed on the transmission shaft; the sprocket I and the sprocket II are connected by a chain; there is a sprocket mounting plate on both sides of the walking wheel, and the top of the sprocket mounting plate Connect the walking wheel mounting seat, the lower end of the sprocket mounting plate is connected to the walking wheel shaft, and the fixed curved plate is connected between the two sprocket mounting plates; the height adjustment seat is provided with the second screw; the bottom end of the second screw is hinged with the fixed curved plate; The lever 2 rotates forward or reversely, which can adjust the inclination angle of the driving wheel chain transmission mechanism; adjust the screw 2 forward and reverse, the length of the screw 2 can be extended or shortened, which is used to control the rotation of the chain transmission mechanism around the driving wheel mounting seat, To change the ground clearance at the rear of the chassis, the clearance adjustment range is 0.6-1m;

The spraying boom spraying system includes a height adjusting rod, a spraying system and a spraying boom folding mechanism.

The height adjusting rod is symmetrically arranged on the left and right sides of the tail of the frame; the height adjusting rod is provided with an adjusting hole.

The spray boom folding mechanism adopts trusses in the form of connecting rods, and the trusses can be mutually driven to expand or fold; the middle truss of the spray boom folding mechanism is parallel to the ground and can be movably installed on the height adjustment rod; the middle truss is connected to different adjustment holes , can adjust the height of the boom folding mechanism from the ground.

The spray system includes a liquid medicine tank, a diaphragm pump, a nozzle, a door-type spray system and a liquid medicine pipeline; the low-pressure liquid inlet of the diaphragm pump is connected to the liquid medicine tank through the liquid medicine pipeline, and the high-pressure liquid outlet of the diaphragm pump is connected to the high-pressure The pipeline; the output shaft of the gasoline engine and the input shaft of the diaphragm pump are connected through a pulley and a belt, and the diaphragm pump is driven to work through a belt drive;

The door-type spray system includes a horizontal spray bar, a boom nozzle, a spray head and a high-pressure pipeline; the horizontal spray bar is arranged corresponding to each section of truss and is respectively installed on each section of truss; the top spray head is arranged on the horizontal spray bar; A boom nozzle is installed vertically downward between every two top nozzles on the horizontal spray boom; each boom nozzle is provided with boom nozzles up and down; the distance between the boom nozzles on each boom nozzle and the suspension The distance between the rod nozzles is adjusted according to the row spacing of the crops; the horizontal spray rod and the boom nozzle are arranged in the shape of a gate.

The flow control system includes a flow control valve and a liquid medicine distributor; the flow control valve and the liquid medicine distributor are installed in sequence on the high-pressure pipeline; the diaphragm pump transports the liquid medicine to the flow control valve through the high-pressure pipeline, and the According to the agronomic requirements, the flow and pressure of the liquid medicine are adjusted through the flow control valve; the liquid medicine distributor distributes the liquid medicine flowing out of the flow control valve into multiple channels, which are respectively connected to the top nozzle and the boom nozzle for plant protection operations;

The transmission system includes a gearbox, a pulley and a belt; the gearbox is connected to the engine through a belt drive; the output shaft of the engine is connected to the input shaft of the gearbox through a pulley and a belt; The output shaft of the box, the output shaft of the gearbox is connected with the transmission shaft, and then the driving wheel is driven to rotate through the chain transmission mechanism to control the forward and backward of the whole machine; at the same time, the engine drives the diaphragm pump through the belt drive to pressurize the liquid medicine.

Before entering the field work, adjust the wheelbase and chassis height according to the row spacing of crop planting and different growth periods. The present invention designs a chassis wheelbase adjustment device and a chassis height adjustment device. The adjustment method is manual adjustment; it can meet the needs of different crops. Row spacing and crop height in different periods improve the machine's passability in the field.

When working, the output shaft of the gasoline engine drives the gearbox to work through the belt and the pulley, and the power is output from the output shaft of the gearbox through the speed change of the gearbox to increase the torque, and drives the drive shaft of the walking wheel to rotate. Chain, sprocket wheel 1 transmit power to road wheel, control the advance and retreat of road wheel. At the same time, the output shaft of the gasoline engine drives the diaphragm pump to work through the belt and pulley. The liquid medicine in the liquid medicine tank enters the diaphragm pump through the low-pressure pipeline, and the medicine liquid enters the flow control valve through the high-pressure pipeline after being pressurized by the diaphragm pump. After the pressure is adjusted, the liquid medicine reaches the top nozzle and the boom nozzle from the high-pressure pipe; the liquid medicine is sprayed through the top nozzle and the boom nozzle at the same time, and the liquid medicine can cover the whole crop to realize the all-round spraying of the crop.

Advantages of the invention

(1) The door-type spraying system designed by the present invention can effectively prevent and control plant diseases and insect pests on tall stalk crops. The downside of effective spraying in the lower middle.

(2) The designed self-propelled high-ground-clearance chassis can be adjusted in wheelbase and chassis height. The wheelbase can be adjusted according to the row spacing of the crops to improve the passability of the machine in the field; the height of the chassis can be adjusted according to the different heights of the crops in different growth periods to prevent damage to the crop plants by the machine.

(3) The present invention is small in size, light in weight, and has a maximum wheelbase of 1.6m. It is a manual hand-held operation. Compared with a self-propelled sprayer equipped with a cab, the volume is small, there is no complicated transmission and hydraulic system, and the engine power Small and light in weight, it is suitable for the use of small plots in my country. At the same time, it saves energy, reduces the compaction of the land, and is convenient and flexible.

The invention can adjust the spraying height of the liquid medicine according to actual needs, and is suitable for different growth periods of crops.

The spray boom of the present invention adopts trusses in the form of connecting rods, and the trusses can be driven to unfold or fold together, which is convenient for transportation, simplifies the structure, and reduces operating costs.

Description of drawings

Figure 1 is a schematic diagram of a small self-propelled high-ground-gap sprayer;

Fig. 2 is a schematic diagram of the door type spray system;

Fig. 3 is a small self-propelled high ground clearance sprayer chassis schematic diagram I;

Fig. 4 is a schematic diagram II of the chassis of a small self-propelled high-ground-clearance sprayer;

Fig. 5 is a schematic diagram of the transmission system of a small self-propelled high-ground-clearance sprayer;

In the figure: 1. Diaphragm pump, 2. Flow control valve, 3. Gasoline engine, 4. Armrest assembly, 5. Armrest adjustment device, 6. Boom nozzle, 7. Left horizontal spray boom, 8. Spray boom Left truss, 9. Spray boom middle truss, 10. Middle horizontal spray boom, 11. Height adjustment rod, 12. Spray boom folding mechanism, 13. Spray boom right truss, 14. High-pressure drug pipe, 15. Right horizontal spray boom , 16. Top nozzle, 17. Boom nozzle, 18. Front wheel height adjustment mechanism, 19. Front wheel track adjustment mechanism, 20. Chemical tank, 21. Drive wheel height adjustment mechanism, 22. Drive wheel track adjustment Mechanism, 23. Gearbox, 24. Height adjustment mechanism, 25. Front wheel support shaft, 26. Road wheel installation frame, 27. Lead screw two, 28. Height adjustment seat, 29. Road wheel installation seat, 30. Chain drive Mechanism, 31. Traveling wheel, 32. Double cross universal joint, 33. Transmission shaft, 34. Front wheel, 35. Front wheel mounting frame, 36. Wheelbase adjustment mechanism, 37. Fixed bent plate, 38. Gearbox pulley , 39. Transmission input shaft, 40. Transmission belt, 41. Engine output shaft, 42. Engine pulley, 43. Diaphragm pump belt, 44. Diaphragm pump pulley, 45. Diaphragm pump input shaft, 46. Sprocket I, 47. Chain, 48. Sprocket II, 49. Transmission output shaft.

specific implementation

As shown in Figure 1, this embodiment takes the plant protection operation of ten rows of crops as an example, and can spray ten rows of crops at the same time.

Before entering the field work, adjust the wheelbase of the sprayer according to the row spacing of crop planting. The wheelbase adjustment range is 1-1.6m. The fixing bolts are loosened so that the height adjustment seat 28 and the traveling wheel mounting seat can be slid left and right on the traveling wheel mounting frame 26 for adjustment, and then the fixed pin on the traveling wheel transmission shaft 33 is opened, and the traveling wheel transmission shaft 33 and the double cross The mounting shaft of the universal joint 32 is nested and connected, and the depth of embedding can be adjusted. One end of the mounting shaft is provided with a plurality of through holes to cooperate with the through holes of the transmission shaft 33, and the two are fixedly connected with a fixed pin. According to the planting row spacing of crops, the walking wheels 31 on both sides are adjusted inwardly or outwardly by the wheelbase adjusting device, and after the adjustment is completed, the bolts and fixing pins are fastened to complete the adjustment of the wheelbase of the walking wheels 31. The fixing bolt at the front wheel track adjusting mechanism 36 places is loosened, and the front wheel support shaft 25 is a hexagonal shaft, which is nestedly connected with the fixed axis at the wheel track adjusting mechanism 36 places, and the depth of embedding can be adjusted and fixed by bolts. According to the wheelbase requirements, the two front wheels 34 are adjusted inwardly or outwardly, and the bolts are tightened after the adjustment is completed, and the wheelbase adjustment between the front wheels 34 is completed.

The height of the crops is different in different growth periods. According to the height of the crops, the height of the chassis is adjusted to improve the passability of the unit in the field. The chassis height adjustment device includes a height adjustment seat 28 and a lead screw 27; the height adjustment seat 28 is installed on the road wheel mounting frame 26; the height adjustment seat 28 and the road wheel mounting seat 29 are symmetrically installed on the road wheel mounting frame 26 On; the height adjustment seat 28 and the walking wheel mounting seat 29 move simultaneously on the walking wheel mounting frame 26; Wheel 31 is connected with a chain drive mechanism 30; said chain drive mechanism 30 comprises sprocket wheel mounting plate, sprocket wheel I46, sprocket wheel II48 and chain 47; chain drive mechanism 30 is fixed on the road wheel mounting seat 29 by the sprocket wheel mounting plate The sprocket I46 is installed on the walking wheel shaft; the sprocket II48 is installed on the transmission shaft 33; the sprocket I46 and the sprocket II48 are connected by a chain 47; the two sides of the walking wheel 31 have a sprocket mounting plate , the upper end of the sprocket mounting plate is connected to the walking wheel mounting seat 29, the lower end of the sprocket mounting plate is connected to the traveling wheel shaft, and the fixed curved plate 37 is connected between the two sprocket mounting plates; the fixed curved plate 37 is fixed on the sprocket mounting plate; height adjustment Seat 28 is provided with leading screw two 27; Leading screw two 27 bottoms are hinged with fixed bent plate 37; Leading screw two 27 forward or reverse rotation, can adjust the inclination angle of walking wheel chain transmission mechanism 30; Adjust leading screw two 27 Forward and reverse rotation, the length of the lead screw 227 is extended or shortened, and is used to control the rotation of the chain transmission mechanism 30 around the mounting seat of the traveling wheel 31 to change the ground clearance at the rear of the chassis, and the clearance adjustment range is 0.6-1m;

By adjusting the handle on the front wheel 34 height adjustment mechanism 24, the ground clearance at the front part of the chassis can be adjusted, so that the front and rear ground clearances of the chassis are the same, and the adjustment of the chassis height of the complete machine is completed.

The boom spraying system adopts trusses in the form of connecting rods, which can be unfolded or folded with each other. The boom folding mechanism 12 adopts manual mechanical folding. It also unfolded accordingly. During work, gasoline engine 3 output shaft 41 drives gearbox 23 work by belt 40, engine pulley 42, gearbox pulley 38, and power is output by gearbox output shaft 49 through gearbox 23 variable speed increases to drive transmission shaft 33 to rotate, Power transmission shaft two ends drive sprocket wheel II48 respectively, through chain 47, sprocket wheel I46 power is transmitted to walking wheel 31, advances and retreats of control walking wheel. Simultaneously, gasoline engine 3 output shaft 41 drives diaphragm pump 1 to work through belt 43, engine pulley 42, diaphragm pump 44, and diaphragm pump absorbs liquid medicine from liquid medicine tank 20, and liquid medicine enters by high-pressure pipeline after being pressurized by diaphragm pump 1. Flow control valve 2, after the flow control valve adjusts the pressure, the liquid medicine reaches the top nozzle 16 and the boom nozzle 17 from the high-pressure medicine pipe 14 and the liquid medicine distributor. The top nozzle 16 and the boom nozzle 17 work at the same time, and the liquid medicine can cover the whole crops, to achieve all-round spraying of crops. The suspender is made of flexible hose to reduce damage to plant leaves.

According to different crop growth periods, the boom spray system can be adjusted up and down, and the height adjustment rod 11 is fixed by bolt connection. According to actual needs, the connection position between the adjustment hole of the height adjustment rod 11 and the middle truss can be changed to realize the up and down adjustment of the spray system.

This embodiment takes ten rows of crop protection operations as an example. The number of simultaneous plant protection operations in the present invention is not limited to ten rows, and can be increased or decreased according to actual needs. It can be applied to plant protection operations for high-stalk crops such as cotton, tobacco, and corn.

Claims (9)

1. A small self-propelled high ground clearance spray machine, including a frame and a transmission system; it is characterized in that: it also includes an adjustable chassis, a boom spray system and a flow control system; The adjustable chassis includes a front wheel track adjusting device, a traveling wheel track adjusting device and a chassis height adjusting device; Two front wheels are installed symmetrically through the front wheel mounting frame in the front of the frame; the front wheel mounting frame is provided with a height adjustment mechanism; the front wheel mounting frame is composed of an upper column and a lower front wheel mounting frame; The height adjustment mechanism of the front wheel includes a lead screw and a handle; the column is composed of two steel pipes of different lengths with movable inner and outer joints; the top of the short thin steel pipe inside is provided with threads; the top of the lead screw is connected with the handle, and the bottom of the lead screw is It is connected with the thread; the bottom of the short thin steel pipe is connected to the front wheel mounting frame, and the front wheel mounting frame is used to install the front wheel; turn the handle, adjust the screw to rotate forward or reverse, drive the short thin steel pipe to move up and down, adjust the height of the column, and thus adjust The ground clearance of the front part of the chassis; the height adjustment mechanism cooperates with the chassis height adjustment device to complete the adjustment of the chassis height of the whole machine; The front wheel track adjustment device includes a fixed shaft and a front wheel support shaft; two ends of the fixed shaft are respectively connected to two front wheel support shafts; the fixed shaft is two hexagonal shafts nested and installed, and the two hexagonal shafts can Slide to adjust the depth of embedding to adjust the distance between the two front wheel support shafts, thereby adjusting the track of the two front wheels; the front wheel support shafts are installed on the front wheel mounting frame; The walking wheel track adjusting device is symmetrically arranged on the left and right sides of the frame behind the front wheels; the walking wheel track adjusting device includes a walking wheel mounting frame, a walking wheel mounting seat, a transmission shaft and a double cross universal joint; The traveling wheel mounting frame is installed on the frame; the bottom of the traveling wheel mounting frame is movable with a traveling wheel mounting seat; at the same time, the two ends of the transmission shaft are respectively nested and connected with the traveling wheel mounting seats on both sides; the traveling wheel mounting seat is used for It is used to install the traveling wheels; the inner side of each traveling wheel is connected with double cross universal joints; the two double cross universal joints are installed on the transmission shaft; the transmission shafts are two hexagonal shafts nested and installed, which can slide relative to adjust the embedding depth , to adjust the distance between the two double cross universal joints; adjust the wheelbase between the road wheels by adjusting the distance between the two double cross universal joints; The chassis height adjustment device includes a height adjustment seat and a lead screw; the height adjustment seat is installed on the road wheel mounting frame; the height adjustment seat and the road wheel mounting seat are vertically symmetrically installed on the road wheel mounting frame; The wheel mount moves simultaneously on the travel wheel mount; the left and right positions of the height adjustment seat and the travel wheel mount on the travel wheel mount are adjustable; each travel wheel is connected with a chain transmission mechanism; the chain transmission mechanism includes a chain Wheel mounting plate, sprocket I, sprocket II and chain; the chain transmission mechanism is fixed on the walking wheel mounting seat through the sprocket mounting plate; the sprocket I is installed on the walking wheel shaft; the sprocket II is installed on the drive shaft above; sprocket I and sprocket II are connected by chains; there is a sprocket mounting plate on both sides of the walking wheel, the upper end of the sprocket mounting plate is connected to the walking wheel mounting seat, the lower end of the sprocket mounting plate is connected to the walking wheel shaft, and the two chains The fixed bending plate is connected between the wheel mounting plates; the height adjustment seat is provided with the second screw; the bottom end of the second screw is hinged with the fixed bending plate; the second screw is forward or reverse, and the inclination angle of the driving wheel chain transmission mechanism can be adjusted ;Adjust the forward and reverse rotation of the lead screw 2, and the length of the lead screw 2 is extended or shortened, which is used to control the rotation of the chain transmission mechanism around the road wheel mounting seat, so as to change the ground clearance at the rear of the chassis; The spray boom spray system includes a height adjustment rod, a spray system and a spray boom folding mechanism; The height adjusting rod is symmetrically arranged on the left and right sides of the tail of the frame; the height adjusting rod is provided with an adjusting hole; The spray boom folding mechanism adopts trusses in the form of connecting rods, and the trusses can be mutually driven to unfold or fold; the middle truss of the spray boom folding mechanism is parallel to the ground and can be movably installed on the height adjustment rods on both sides; The spray system includes a liquid medicine tank, a diaphragm pump, a nozzle, a door-type spray system and a liquid medicine pipeline; the low-pressure liquid inlet of the diaphragm pump is connected to the liquid medicine tank through the liquid medicine pipeline, and the high-pressure liquid outlet of the diaphragm pump is connected to the high-pressure The pipeline; the output shaft of the gasoline engine and the input shaft of the diaphragm pump are connected through a pulley and a belt, and the diaphragm pump is driven to work through a belt drive; The door-type spray system includes a horizontal spray bar, a boom nozzle, a spray head and a high-pressure pipeline; the horizontal spray bar is arranged corresponding to each section of truss and is respectively installed on each section of truss; the top spray head is arranged on the horizontal spray bar; A boom nozzle is installed vertically downward between every two top nozzles on the horizontal spray boom; each boom nozzle is provided with boom nozzles up and down; the nozzles are connected to the liquid medicine tank through the liquid medicine pipeline; The flow control system includes a flow control valve and a liquid medicine distributor; the flow control valve and the liquid medicine distributor are installed in sequence on the high-pressure pipeline; the diaphragm pump transports the liquid medicine to the flow control valve through the high-pressure pipeline, and the According to the agronomic requirements, the liquid medicine flow and pressure are adjusted through the flow control valve; the liquid medicine distributor distributes the liquid medicine flowing out of the flow control valve into multiple channels, which are respectively connected to the top nozzle and the boom nozzle. 2. A small self-propelled high-ground-clearance sprayer as claimed in claim 1, characterized in that: according to the planting row spacing of crops, the wheelbase of the traveling wheels can be adjusted within 1-1.6m. 3. A small self-propelled high-ground-clearance sprayer as claimed in claim 1, characterized in that: the ground clearance adjustment range of the rear part of the chassis is 0.6-1m. 4. A small self-propelled high-ground-clearance sprayer as claimed in claim 1, characterized in that: the middle truss is connected with different adjustment holes to adjust the height of the boom folding mechanism from the ground. 5. A small self-propelled high-ground-clearance sprayer as claimed in claim 1, characterized in that: said horizontal spray bars can be folded or unfolded. 6. A small self-propelled high-ground-clearance sprayer as claimed in claim 1, characterized in that the distance between the top nozzles and the up and down positions of the boom nozzles can be adjusted. 7. A small self-propelled high-ground-clearance sprayer as claimed in claim 1, characterized in that: the distance between the two boom nozzles is adjustable. 8. A small self-propelled high-gap sprayer as claimed in claim 1, characterized in that: the nozzles on the two boom nozzles on both sides of each planting row are arranged relatively symmetrically; The nozzle on the rod nozzle sprays each row of crops from left and right directions. 9. A small self-propelled high clearance sprayer as claimed in claim 1, characterized in that: the transmission system includes a gearbox, a pulley and a belt; the gearbox and the engine are connected through a belt drive; the output shaft of the engine is connected to the transmission The input shaft of the box is connected by a pulley and a belt; after the gearbox changes speed and torque, the power is transmitted to the output shaft of the gearbox through the internal gear transmission, and the output shaft of the gearbox is connected with the transmission shaft, and then the driving wheel is driven to rotate through the chain transmission mechanism to control the whole machine At the same time, the engine drives the diaphragm pump to work through the belt drive to pressurize the liquid medicine.