Pesticide spraying machine walking hydraulic system and pesticide spraying machine

Abstract

The invention relates to the technical field of hydraulic control, in particular to a pesticide spraying machine walking hydraulic system and a pesticide spraying machine. An oil inlet of a walking pump assembly is communicated with an oil tank through a pipeline, and an oil outlet of the walking pump assembly is provided with four oil ways; the first oil way is communicated with an oil inlet of the first electromagnetic valve set, and an oil outlet of the first electromagnetic valve set is sequentially communicated with oil inlets of the two rear wheel double-speed motors and a circulating oil inlet of the walking pump assembly. The second oil way is sequentially communicated with oil inlets of the two front wheel double-speed motors, a second electromagnetic valve set and a circulating oil inlet of the walking pump assembly. The third oil way is communicated with an oil inlet of a third electromagnetic valve set, one oil outlet of the third electromagnetic valve set is communicated with displacement controllers of the four double-speed motors through pipelines, and the other oil outlet of the third electromagnetic valve set is communicated with brake cylinders of the four double-speed motors. According to the invention, four wheel motors are controlled, so that the walking control function of the whole machine is realized; remote operation is achieved through an electro-hydraulic control mode, and operation is convenient and fast.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic control, and particularly to a traveling hydraulic system for a spraying machine and a spraying machine. Background Art

[0002] With the national promotion of large-scale farms, large-area planting of the same type of crops has become a trend, which puts forward new requirements for the operation of large agricultural machinery. Quick, efficient, precise, convenient, reliable, low maintenance, etc. have become the characteristics of mainstream agricultural machinery, especially prominent during the crop spraying stage.

[0003] The components in the existing traveling hydraulic system of sprayers have relatively high precision requirements, resulting in relatively high costs. This makes some users give up high-performance hydraulic systems due to price factors when choosing sprayers, thus affecting the overall performance and market promotion of sprayers. Many sprayers use a two-wheel drive open hydraulic system, and when facing muddy areas and terrains with relatively large slopes, their stable passing performance and operation effect will be greatly affected. This limits the use of sprayers in some complex terrains and cannot meet the needs of diversified agricultural operations. The hydraulic systems of some sprayers are not comfortable and convenient to operate, especially in terms of speed regulation and commutation. For example, some systems require complex operation steps to achieve speed adjustment and direction change, which not only increases the labor intensity of operators but also may cause equipment damage or operation accidents due to improper operation. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a traveling hydraulic system for a spraying machine and a spraying machine to overcome the deficiencies in the prior art.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: A walking hydraulic system for a spraying machine, comprising an oil tank and a walking pump assembly. The inlet of the walking pump assembly is communicated with the oil tank through a pipeline. The outlet of the walking pump assembly is respectively communicated with a first oil circuit, a second oil circuit, a third oil circuit and a fourth oil circuit. The oil return port of the walking pump assembly is communicated with the oil tank through an oil return pipeline. The first oil circuit is communicated with the inlet of a first solenoid valve group. The outlets of the first solenoid valve group are respectively communicated with the inlets of two rear-wheel two-speed motors. The outlets of the two rear-wheel two-speed motors are communicated with the circulating inlet of the walking pump assembly through pipelines. The second oil circuit is respectively communicated with the inlets of two front-wheel two-speed motors. The outlets of the two front-wheel two-speed motors are both communicated with the inlet of a second solenoid valve group. The outlet of the second solenoid valve group is communicated with the circulating inlet of the walking pump assembly through a pipeline. The third oil circuit is communicated with the inlet of a third solenoid valve group. One outlet of the third solenoid valve group is communicated with the displacement controllers of the two front-wheel two-speed motors and the two rear-wheel two-speed motors through pipelines. The other outlet of the third solenoid valve group is communicated with the brake cylinders of the two front-wheel two-speed motors and the two rear-wheel two-speed motors through pipelines. The oil return ports of the two front-wheel two-speed motors and the two rear-wheel two-speed motors are all communicated with the oil tank. The fourth oil circuit is communicated with the control port of a cooling valve. The inlet of the cooling valve is communicated with the circulating inlet of the walking pump assembly through a pipeline. The outlet of the cooling valve is communicated with the oil return pipeline through a pipeline.

[0006] The beneficial effects of the present invention are as follows: The present invention realizes the control of four wheel motors through the combination of the walking pump assembly, the first solenoid valve group, the second solenoid valve group and the third solenoid valve group, so as to realize the walking control function of the whole machine; through the electro-hydraulic control method, remote operation is realized, and the operation is convenient and fast.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Further, the traveling pump assembly includes a traveling pump housing, a variable pump, a gear pump, a first overflow valve, a first safety valve, a second safety valve, a forward proportional valve, and a reverse proportional valve disposed within the traveling pump housing. The inlet of the gear pump communicates with the fuel tank. The outlet of the gear pump is connected to the inlet of the first overflow valve through a pipeline. The outlet of the first overflow valve communicates with the return pipeline through a pipeline. The outlet of the gear pump communicates with the third oil circuit and the inlet of the forward proportional valve through an oil outlet pipeline. The outlet of the forward proportional valve communicates with one side variable plunger of the variable pump through a pipeline. The other side variable plunger of the variable pump communicates with the interior of the traveling pump housing through the reverse proportional valve. The oil outlet pipeline also communicates with the inlets of the first safety valve and the second safety valve. The outlet of the first safety valve communicates with the first oil circuit and the second oil circuit through a pipeline. The outlet of the second safety valve communicates with the inlet of the variable pump through a pipeline. The inlet of the variable pump is the circulating inlet of the traveling pump assembly. The outlets of the two rear-wheel two-speed motors, the outlet of the second solenoid valve group, and the inlet of the cooling valve are all connected to the inlet of the variable pump through pipelines. The outlet of the variable pump communicates with the first oil circuit, the second oil circuit, and the fourth oil circuit through a pipeline.

[0009] The beneficial effect of adopting the above further solution is that through the cooperation of the variable pump and the gear pump, the recycling of hydraulic oil is realized, the energy consumption is reduced, and the efficiency is improved.

[0010] Further, the cooling valve includes a reversing valve and a second overflow valve. The fourth oil circuit communicates with the control port of the reversing valve. The inlet of the reversing valve communicates with the inlet of the variable pump through a pipeline. The outlet of the reversing valve communicates with the inlet of the second overflow valve through a pipeline. The outlet of the second overflow valve communicates with the return pipeline through a pipeline.

[0011] The beneficial effect of adopting the above further solution is that through the cooperation of the reversing valve and the second overflow valve, part of the high-temperature and low-pressure oil on the inlet side of the variable pump is returned to the fuel tank for cooling, avoiding the over-high oil temperature conveyed by the variable pump.

[0012] Further, a filter is provided on the oil outlet pipeline.

[0013] The beneficial effect of adopting the above further solution is that the setting of the filter can filter the oil fluid, avoiding the influence of impurities in the oil fluid on the use of each component.

[0014] Further, the first solenoid valve group includes a first solenoid valve A and a first solenoid valve B. The oil inlets of the first solenoid valve A and the first solenoid valve B are both connected to the first oil circuit, and the oil outlets of the first solenoid valve A and the first solenoid valve B are respectively connected to the oil inlets of the two rear-wheel two-speed motors.

[0015] The beneficial effect of adopting the above further solution is that the first solenoid valve A and the first solenoid valve B respectively control the oil supply of the two rear-wheel two-speed motors. Different rotational speeds of the two rear-wheel two-speed motors can be achieved by adjusting the amount of oil supply to the two rear-wheel two-speed motors, and thus the rotational speed is achieved through the rear wheels.

[0016] Further, the second solenoid valve group includes a second solenoid valve A and a second solenoid valve B. The oil outlets of the two front-wheel two-speed motors are respectively connected to the oil inlets of the second solenoid valve A and the second solenoid valve B through pipelines, and the oil outlets of the second solenoid valve A and the second solenoid valve B are both connected to the oil inlet of the variable pump.

[0017] The beneficial effect of adopting the above further solution is that the second solenoid valve A and the second solenoid valve B respectively control the oil supply of the two front-wheel two-speed motors. Different rotational speeds of the two front-wheel two-speed motors can be achieved by adjusting the amount of oil supply to the two front-wheel two-speed motors, and thus the rotational speed is achieved through the front wheels.

[0018] Further, the third solenoid valve group includes a third solenoid valve A, a third solenoid valve B, and a third solenoid valve C. The third oil circuit is connected to the oil inlets of the third solenoid valve A, the third solenoid valve B, and the third solenoid valve C. The oil outlet of the third solenoid valve A is respectively connected to the displacement controllers of the two front-wheel two-speed motors through pipelines, and the oil outlet of the third solenoid valve C is respectively connected to the displacement controllers of the two rear-wheel two-speed motors through pipelines; the oil outlet of the third solenoid valve B is respectively connected to the braking ports of the two front-wheel two-speed motors and the two rear-wheel two-speed motors through pipelines.

[0019] The beneficial effects of adopting the above further scheme are as follows: The third solenoid valve A is connected to the displacement controllers of the two front-wheel two-speed motors, and can control the pressure oil to push the displacement mechanism to act, so that the two front-wheel two-speed motors are in the small displacement state. At this time, when the same hydraulic oil is input to the two front-wheel two-speed motors, higher speeds can be obtained; The third solenoid valve C is connected to the displacement controllers of the two rear-wheel two-speed motors, and can control the pressure oil to push the displacement mechanism to act, so that the two rear-wheel two-speed motors are in the small displacement state. At this time, when the same hydraulic oil is input to the two front-wheel two-speed motors, higher speeds can be obtained; The above structure can realize controlling the front-wheel two-speed motor and / or the rear-wheel two-speed motor to operate at a higher speed, so that the whole vehicle can obtain a higher vehicle speed; The third solenoid valve B is connected to the braking ports of the two front-wheel two-speed motors and the two rear-wheel two-speed motors, so as to realize the control of the front and rear wheel braking.

[0020] Furthermore, a manual pump is further included. The oil inlet of the manual pump is communicated with the fuel tank through a pipeline, and the oil outlet of the manual pump is communicated with the braking ports of the two front-wheel two-speed motors and the two rear-wheel two-speed motors respectively through pipelines.

[0021] The beneficial effects of adopting the above further scheme are as follows: The setting of the manual pump can generate pressure oil manually in an emergency when the third solenoid valve group cannot be started, so that the hydraulic oil enters the braking ports of the front-wheel two-speed motor and the rear-wheel two-speed motor, causing the piston of the brake cylinder to retract, reducing the paper to fully release the brake, enabling the wheels to rotate normally, and thus realizing dragging or temporarily transferring the sprayer in an emergency state.

[0022] Furthermore, a stop valve is provided on the pipeline of the oil outlet of the third solenoid valve B.

[0023] The beneficial effects of adopting the above further scheme are as follows: The setting of the stop valve can prevent the hydraulic oil generated when manually pressing the manual pump from flowing back to the third solenoid valve group, resulting in the loss of hydraulic oil.

[0024] The present invention also provides a spraying machine for solving the above technical problems, including the above-mentioned walking hydraulic system of the spraying machine.

[0025] The beneficial effects of adopting the above scheme are as follows: The present invention combines the walking pump assembly with the first solenoid valve group, the second solenoid valve group and the third solenoid valve group to realize the control of the four-wheel motors, so as to realize the walking control function of the whole machine; Through the electro-hydraulic control method, remote operation is realized, and the operation is convenient and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is the schematic diagram of the walking hydraulic system of the spraying machine of the present invention;

[0027] Figure 2This is a schematic diagram of the oil replenishment state of the traveling hydraulic system of the pesticide spraying machine of the present invention. The arrows in the attached drawings indicate the flow direction of the oil fluid in this state;

[0028] Figure 3 This is a schematic diagram of the brake release state of the traveling hydraulic system of the pesticide spraying machine of the present invention. The arrows in the attached drawings indicate the flow direction of the oil fluid in this state;

[0029] Figure 4 This is a schematic diagram of the forward state of the traveling hydraulic system of the pesticide spraying machine of the present invention. The arrows in the attached drawings indicate the flow direction of the oil fluid in this state;

[0030] Figure 5 This is a schematic diagram of the speed change state of the traveling hydraulic system of the pesticide spraying machine of the present invention. The arrows in the attached drawings indicate the flow direction of the oil fluid in this state;

[0031] Figure 6 This is a schematic diagram of the manual brake release state of the traveling hydraulic system of the pesticide spraying machine of the present invention. The arrows in the attached drawings indicate the flow direction of the oil fluid in this state;

[0032] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0033] 1. Suction filter; 2. Traveling pump assembly; 2.1 Variable pump; 2.2 Gear pump; 2.3 First overflow valve; 2.4 Filter; 2.5 First safety valve; 2.6 Second safety valve; 2.7 Forward proportional valve; 2.8 Reverse proportional valve; 3. Cooling valve; 3.1 Directional control valve; 3.2 Second overflow valve; 4. First solenoid valve group; 4.1 First solenoid valve A; 4.2 First solenoid valve B; 5. Second solenoid valve group; 5.1 Second solenoid valve A; 5.2 Second solenoid valve B; 6. Third solenoid valve group; 6.1 Third solenoid valve A; 6.2 Third solenoid valve B; 6.3 Third solenoid valve C; 7. Two-speed motor A; 7.1 Brake cylinder A; 8. Two-speed motor B; 8.1 Brake cylinder B; 9. Two-speed motor C; 9.1 Brake cylinder C; 10. Two-speed motor D; 10.1 Brake cylinder D; 11. Check valve; 12. Oil cooler; 13. Manual pump; 14. Outlet pipeline; 15. Return pipeline; 16. Fuel tank. Detailed implementation manners

[0034] The principles and features of the present invention will be described below with reference to the attached drawings. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0035] Example 1

[0036] As Figure 1As shown in the figure, this embodiment discloses a traveling hydraulic system for a spraying machine, which includes an oil tank 16 and a traveling pump assembly 2. The inlet of the traveling pump assembly 2 is connected to the oil tank 16 through a pipeline. An oil suction filter 1 is provided on the pipeline connected to the inlet of the traveling pump assembly 2. The outlet of the traveling pump assembly 2 is respectively connected to a first oil circuit, a second oil circuit, a third oil circuit, and a fourth oil circuit. The return port of the traveling pump assembly 2 is connected to the oil tank 16 through a return pipeline 15, and an oil cooler 12 is provided on the return pipeline 15 for cooling the return oil.

[0037] The first oil circuit is connected to the inlet of a first solenoid valve group 4. The outlets of the first solenoid valve group 4 are respectively connected to the inlets of two rear-wheel two-speed motors. The outlets of the two rear-wheel two-speed motors are connected to the circulating inlet of the traveling pump assembly 2 through pipelines. In this embodiment, the two rear-wheel two-speed motors are a two-speed motor C9 and a two-speed motor D10 respectively, and wheels are respectively connected to the output ends of the two-speed motor C9 and the two-speed motor D10.

[0038] The second oil circuit is respectively connected to the inlets of two front-wheel two-speed motors. The outlets of the two front-wheel two-speed motors are both connected to the inlet of a second solenoid valve group 5. The outlet of the second solenoid valve group 5 is connected to the circulating inlet of the traveling pump assembly 2 through a pipeline. In this embodiment, the two front-wheel two-speed motors are a two-speed motor A7 and a two-speed motor B8 respectively, and wheels are respectively connected to the output ends of the two-speed motor A7 and the two-speed motor B8.

[0039] The third oil circuit is connected to the inlet of a third solenoid valve group 6. One outlet of the third solenoid valve group 6 is connected to the displacement controllers of the two-speed motor A7, the two-speed motor B8, the two-speed motor C9, and the two-speed motor D10 through pipelines. The other outlet of the third solenoid valve group 6 is connected to the brake cylinder A7.1 of the two-speed motor A7, the brake cylinder B8.1 of the two-speed motor B8, the brake cylinder C9.1 of the two-speed motor C9, and the brake cylinder D10.1 of the two-speed motor D10 through pipelines. The return ports of the two-speed motor A7, the two-speed motor B8, the two-speed motor C9, and the two-speed motor D10 are all connected to the oil tank 16.

[0040] The fourth oil circuit is connected to the control port of a cooling valve 3. The inlet of the cooling valve 3 is connected to the circulating inlet of the traveling pump assembly 2 through a pipeline. The outlet of the cooling valve 3 is connected to the return pipeline 15 through a pipeline.

[0041] In an embodiment of the present invention, the traveling pump assembly 2 includes a traveling pump housing and a variable pump 2.1, a gear pump 2.2, a first overflow valve 2.3, a first safety valve 2.5, a second safety valve 2.6, a forward proportional valve 2.7, and a reverse proportional valve 2.8 provided in the traveling pump housing. The inlet of the gear pump 2.2 communicates with the fuel tank 16. The outlet of the gear pump 2.2 is connected to the inlet of the first overflow valve 2.3 through a pipeline. The outlet of the first overflow valve 2.3 is communicated with the return pipeline 15 through a pipeline. The outlet of the gear pump 2.2 is communicated with the third oil circuit and the inlet of the forward proportional valve 2.7 through an oil outlet pipeline 14. A filter 2.4 is provided on the oil outlet pipeline 14. The setting of the filter 2.4 can filter the oil fluid to prevent impurities in the oil fluid from affecting the use of each component.

[0042] The outlet of the forward proportional valve 2.7 is communicated with one side variable plunger of the variable pump 2.1 through a pipeline. The other side variable plunger of the variable pump 2.1 is communicated with the inside of the traveling pump housing through the reverse proportional valve 2.8. The oil outlet pipeline 14 also communicates with the inlets of the first safety valve 2.5 and the second safety valve 2.6. The outlet of the first safety valve 2.5 is communicated with the first oil circuit and the second oil circuit through a pipeline. The outlet of the second safety valve 2.6 is communicated with the inlet of the variable pump 2.1 through a pipeline. The inlet of the variable pump 2.1 is the circulating inlet of the traveling pump assembly 2. The outlets of the two-speed motor C9 and the two-speed motor D10, the outlet of the second solenoid valve group 5, and the inlet of the cooling valve 3 are all communicated with the inlet of the variable pump 2.1 through pipelines. The outlet of the variable pump 2.1 is communicated with the first oil circuit, the second oil circuit, and the fourth oil circuit through a pipeline. Through the cooperation of the variable pump 2.1 and the gear pump 2.2, the recycling of hydraulic oil is realized, the energy consumption is reduced, and the efficiency is improved.

[0043] The cooling valve 3 includes a directional control valve 3.1 and the second overflow valve 3.2. The fourth oil circuit is communicated with the control port of the directional control valve 3.1. The inlet of the directional control valve 3.1 is communicated with the inlet of the variable pump 2.1 through a pipeline. The outlet of the directional control valve 3.1 is communicated with the inlet of the second overflow valve 3.2 through a pipeline. The outlet of the second overflow valve 3.2 is communicated with the return pipeline 15 through a pipeline. The cooperation of the directional control valve 3.1 and the second overflow valve 3.2 realizes the return cooling of part of the high-temperature and low-pressure oil fluid on the inlet side of the variable pump 2.1 to the fuel tank 16, preventing the oil temperature transported by the variable pump 2.1 from being too high.

[0044] The first solenoid valve group 4 includes a first solenoid valve A 4.1 and a first solenoid valve B 4.2. The oil inlets of the first solenoid valve A 4.1 and the first solenoid valve B 4.2 are both connected to the first oil circuit. The oil outlets of the first solenoid valve A 4.1 and the first solenoid valve B 4.2 are respectively connected to the oil inlets of a two-speed motor C 9 and a two-speed motor D 10. The first solenoid valve A 4.1 and the first solenoid valve B 4.2 respectively control the oil supply to the two-speed motor C 9 and the two-speed motor D 10. Different rotational speeds of the two-speed motor C 9 and the two-speed motor D 10 can be achieved by adjusting the amount of oil supply to the two-speed motor C 9 and the two-speed motor D 10, and thus the rotational speed through the rear wheels can be achieved.

[0045] The second solenoid valve group 5 includes a second solenoid valve A 5.1 and a second solenoid valve B 5.2. The oil outlets of the two-speed motor A 7 and the two-speed motor B 8 are respectively connected to the oil inlets of the second solenoid valve A 5.1 and the second solenoid valve B 5.2 through pipelines. The oil outlets of the second solenoid valve A 5.1 and the second solenoid valve B 5.2 are both connected to the oil inlet of the variable pump 2.1. The second solenoid valve A 5.1 and the second solenoid valve B 5.2 respectively control the oil supply to the two-speed motor A 7 and the two-speed motor B 8. Different rotational speeds of the two-speed motor A 7 and the two-speed motor B 8 can be achieved by adjusting the amount of oil supply to the two-speed motor A 7 and the two-speed motor B 8, and thus the rotational speed through the front wheels can be achieved.

[0046] The third solenoid valve group 6 includes a third solenoid valve A6.1, a third solenoid valve B6.2, and a third solenoid valve C6.3. The third oil passage is in communication with the oil inlets of the third solenoid valve A6.1, the third solenoid valve B6.2, and the third solenoid valve C6.3. The oil outlet of the third solenoid valve A6.1 is respectively connected to the displacement controllers of the two-speed motor A7 and the two-speed motor B8 through pipelines. The oil outlet of the third solenoid valve C6.3 is respectively connected to the displacement controllers of the two-speed motor C9 and the two-speed motor D10 through pipelines. The oil outlet of the third solenoid valve B6.2 is respectively connected to the braking ports of the two-speed motor A7, the two-speed motor B8, the two-speed motor C9, and the two-speed motor D10 through pipelines. The third solenoid valve A6.1 is connected to the displacement controllers of the two-speed motor A7 and the two-speed motor B8, and can control the pressure oil to push the displacement mechanism to act, so that the two-speed motor A7 and the two-speed motor B8 are in the small displacement state. At this time, when the same hydraulic oil is input to the two-speed motor A7 and the two-speed motor B8, a higher rotational speed is obtained. The third solenoid valve C6.3 is connected to the displacement controllers of the two-speed motor C9 and the two-speed motor D10, and can control the pressure oil to push the displacement mechanism to act, so that the two-speed motor C9 and the two-speed motor D10 are in the small displacement state. At this time, when the same hydraulic oil is input to the two-speed motor A7 and the two-speed motor B8, a higher rotational speed is obtained. The above structure can realize controlling the two-speed motor A7 and the two-speed motor B8 and / or the two-speed motor C9 and the two-speed motor D10 to operate at a higher rotational speed, so that the vehicle can obtain a higher vehicle speed. The third solenoid valve B6.2 is connected to the braking ports of the two-speed motor A7, the two-speed motor B8, the two-speed motor C9, and the two-speed motor D10, so as to realize the control of the front and rear wheel brakes.

[0047] It further includes a manual pump 13. The oil inlet of the manual pump 13 is connected to the fuel tank 16 through a pipeline. The oil outlet of the manual pump 13 is respectively connected to the braking ports of the two-speed motor A7, the two-speed motor B8, the two-speed motor C9, and the two-speed motor D10. The setting of the manual pump 13 can, in an emergency situation when the third solenoid valve group 6 cannot be started, manually generate pressure oil, so that the hydraulic oil enters the braking ports of the two-speed motor A7, the two-speed motor B8, the two-speed motor C9, and the two-speed motor D10, causing the pistons of the brake cylinders A7.1, B8.1, C9.1, and D10.1 to retract, reducing the paper to fully release the brake, enabling the wheels to rotate normally, and thus realizing dragging or temporarily transferring the sprayer in an emergency state.

[0048] Preferably, a stop valve 11 is provided on the pipeline of the oil outlet of the third solenoid valve B6.2. The setting of the stop valve 11 can prevent the hydraulic oil generated when manually operating the manual pump 13 from flowing back to the third solenoid valve group 6, causing loss of hydraulic oil.

[0049] Working principle:

[0050] Oil replenishment state: As Figure 2 shown, the gear pump 2.2 transports hydraulic oil through the oil suction filter 1 to the filter 2.4, and the pressurized oil is then transported to the hydraulic system pipeline through the first safety valve 2.5 and the second safety valve 2.6. When the oil outlet pressure of the gear pump 2.2 rises to the set value of the first overflow valve 2.3, the first overflow valve 2.3 opens, and the excess oil is transported to the oil radiator 12 through the housing of the travel pump assembly 2. The cooled oil returns to the fuel tank 16. Thus, the travel system completes the replenishment of the hydraulic pipeline oil through the gear pump 2.2 and waits for the commands of other controls.

[0051] Brake release state: As Figure 3 shown, the braking after the shutdown of the whole machine is realized by the brakes in the two-speed motor A7, two-speed motor B8, two-speed motor C9 and two-speed motor D10. This brake is a normally closed spring brake with an oil pressure release control method. When the brake needs to be released, the third solenoid valve B6.2 in the third solenoid valve group 6 is energized. At this time, the pressure oil output by the gear pump 2.2 is transported to the brake cylinders A7.1, B8.1, C9.1 and D10.1 through the third solenoid valve B6.2. After the pressure oil overcomes the spring force, it forces the brake cylinders A7.1, B8.1, C9.1 and D10.1 to retract, and the pressing force of the brake decreases until it is completely released. Thus, through the solenoid valve control, the release of the braking state of the whole machine is realized.

[0052] Forward state: As Figure 4As shown, when the whole machine needs to move forward, the forward proportional valve 2.7 is energized; the gear pump 2.2 outputs the pressure oil to the forward proportional valve 2.7, and then to the variable plunger of the variable pump 2.1; the variable plunger on the other side of the variable pump 2.1 returns the oil to the housing of the travel pump assembly 2 through the reverse proportional valve 2.8. While the variable plunger moves, the displacement of the variable pump 2.1 gradually increases to the set value, and the variable pump 2.1 outputs high-pressure oil in three ways (i.e., the first oil circuit, the second oil circuit, and the fourth oil circuit): the first oil circuit goes to the first solenoid valve group 4, at which time the first solenoid valve group 4 is not energized, and the high-pressure oil is respectively delivered to the oil inlet of the dual-speed motor C9 and the oil inlet of the dual-speed motor D10; the second oil circuit goes to the oil inlet of the dual-speed motor A7 and the oil inlet of the dual-speed motor B8, and the return oil of the dual-speed motor A7 and the dual-speed motor B8 is delivered to the second solenoid valve group 5, which is also not energized; the return oil of the first oil circuit and the second oil circuit are collected together and then merged into the oil inlet of the variable pump 2.1, thereby achieving the internal circulation of the high-pressure to low-pressure conversion of the closed system. The fourth oil circuit goes to the cooling valve 3. After the high-pressure oil forces the reversing valve 3.1 to change direction, part of the high-temperature and low-pressure oil on the oil inlet side of the variable pump 2.1 passes through the reversing valve 3.1 and the second relief valve 3.2, and is combined with the oil from the gear pump 2.2 after passing through the first relief valve 2.3 and is transported to the oil radiator 12, and the cooled oil returns to the oil tank 16. When part of the high-temperature and low-pressure oil on the oil inlet side of the variable pump 2.1 returns to the oil tank 16, in order to prevent insufficient oil on the oil inlet side, the cooled oil output by the gear pump 2.2 is always replenished to the oil inlet of the variable pump 2.1 through the second safety valve 2.6, thus completing the low-pressure side oil replenishment function of the closed system.

[0053] Speed change status: Figure 5 As shown, this sprayer speed control has two routes: first, by controlling the input current of the forward proportional valve 2.7 and the reverse proportional valve 2.8 to achieve stepless speed change; second, by controlling the different displacements of the two-speed motor A7, the two-speed motor B8, the two-speed motor C9, and the two-speed motor D10 to achieve the high and low gear switching. The two technical routes can be combined to achieve stepless speed control within the highest speed range of high and low gears. Here, the displacement control of the two-speed motor A7, the two-speed motor B8, the two-speed motor C9, and the two-speed motor D10 is introduced in detail.

[0054] When the third solenoid valves A6.1 and C6.3 in the third solenoid valve group 6 are de-energized, the double-speed motors A7, B8, C9, and D10 all operate at a large displacement, and at this time, the vehicle speed of the whole vehicle operates within a lower vehicle speed range; when the third solenoid valves A6.1 and C6.3 in the third solenoid valve group 6 are energized, the pressurized oil output by the gear pump 2.2 is delivered to the third solenoid valve group 6 after passing through the filter 2.4. At this time, the pressurized oil reaches the displacement controllers of the double-speed motors A7, B8, C9, and D10 through the third solenoid valve A6.1 and the third solenoid valve C6.3 respectively. The pressurized oil pushes the displacement mechanism to act, making the double-speed motors in a small displacement state; at this time, when the double-speed motors receive the same hydraulic oil input, the motors obtain a higher speed, and the vehicle speed of the whole vehicle operates within a higher vehicle speed range.

[0055] Manual release of the braking state: As Figure 6 shown, when the sprayer needs to be towed or temporarily transferred in an emergency state, the vehicle itself cannot start, and the wheels are braked by the brakes built into the double-speed motors A7, B8, C9, and D10, and the wheels cannot rotate either. At this time, if you want the wheels to rotate, you can use the manual emergency function, and the control principle is as follows:

[0056] Close the stop valve 11 and manually press the manual pump 13. The generated pressurized oil will be delivered to the brake cylinder A7.1 in the double-speed motor A7, the brake cylinder B8.1 in the double-speed motor B8, the brake cylinder C9.1 in the double-speed motor C9, and the brake cylinder D10.1 in the double-speed motor D10. Under the action of the oil pressure, it is forced to retract, the braking force of the brake is reduced until it is completely released, and the wheels can rotate normally.

[0057] Embodiment 2

[0058] This embodiment discloses a spraying machine, including the walking hydraulic system of the spraying machine described above.

[0059] The present invention combines the walking pump assembly 2 with the first solenoid valve group 4, the second solenoid valve group 5, and the third solenoid valve group 6 to realize the control of the four-wheel motors, thereby realizing the walking control function of the whole machine; through the electro-hydraulic control method, remote operation is realized, the operation is convenient and fast, and the control of the vehicle speed, braking, and cooling of the whole vehicle is realized through the logical control between components; by adopting a special double-speed motor structure, the simplification of the whole machine layout and the optimization of performance are realized.

[0060] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "inner", "outer", "peripheral side", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0061] In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0062] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] In the description of this specification, the description referring to terms such as "an embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0064] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A walking hydraulic system for a spraying machine, characterized in that, It includes a fuel tank (16) and a travel pump assembly (2). The inlet of the travel pump assembly (2) is connected to the fuel tank (16) through a pipeline. The outlet of the travel pump assembly (2) is respectively connected to a first oil circuit, a second oil circuit, a third oil circuit and a fourth oil circuit. The oil return port of the travel pump assembly (2) is connected to the fuel tank (16) through an oil return pipeline (15); the first oil circuit is connected to the inlet of a first solenoid valve group (4), the outlets of the first solenoid valve group (4) are respectively connected to the inlets of two rear-wheel two-speed motors, and the outlets of the two rear-wheel two-speed motors are connected to the circulating inlet of the travel pump assembly (2) through pipelines; the second oil circuit is respectively connected to the inlets of two front-wheel two-speed motors, the outlets of the two front-wheel two-speed motors are both connected to the inlet of a second solenoid valve group (5), and the outlet of the second solenoid valve group (5) is connected to the circulating inlet of the travel pump assembly (2) through a pipeline; the third oil circuit is connected to the inlet of a third solenoid valve group (6), one outlet of the third solenoid valve group (6) is connected to the displacement controllers of the two front-wheel two-speed motors and the two rear-wheel two-speed motors through pipelines, the other outlet of the third solenoid valve group (6) is connected to the brake cylinders of the two front-wheel two-speed motors and the two rear-wheel two-speed motors through pipelines, and the oil return ports of the two front-wheel two-speed motors and the two rear-wheel two-speed motors are all connected to the fuel tank (16); the fourth oil circuit is connected to the control port of a cooling valve (3), the inlet of the cooling valve (3) is connected to the circulating inlet of the travel pump assembly (2) through a pipeline, and the outlet of the cooling valve (3) is connected to the oil return pipeline (15) through a pipeline.

2. The walking hydraulic system of a spraying machine according to claim 1, wherein The walking pump assembly (2) includes a walking pump housing and a variable pump (2.1), a gear pump (2.2), a first overflow valve (2.3), a first safety valve (2.5), a second safety valve (2.6), a forward proportional valve (2.7) and a reverse proportional valve (2.8) arranged in the walking pump housing. The inlet of the gear pump (2.2) is communicated with the fuel tank (16). The outlet of the gear pump (2.2) is connected to the inlet of the first overflow valve (2.3) through a pipeline. The outlet of the first overflow valve (2.3) is communicated with the return pipeline (15) through a pipeline. The outlet of the gear pump (2.2) is communicated with the third oil circuit and the inlet of the forward proportional valve (2.7) through an oil outlet pipeline (14). The outlet of the forward proportional valve (2.7) is communicated with one side variable plunger of the variable pump (2.1) through a pipeline. The other side variable plunger of the variable pump (2.1) is communicated with the inside of the walking pump housing through the reverse proportional valve (2.8). The oil outlet pipeline (14) is also communicated with the inlets of the first safety valve (2.5) and the second safety valve (2.6). The outlet of the first safety valve (2.5) is communicated with the first oil circuit and the second oil circuit through a pipeline. The outlet of the second safety valve (2.6) is communicated with the inlet of the variable pump (2.1) through a pipeline. The inlet of the variable pump (2.1) is the circulating inlet of the walking pump assembly (2). The outlets of the two rear-wheel two-speed motors, the outlet of the second solenoid valve group (5) and the inlet of the cooling valve (3) are all communicated with the inlet of the variable pump (2.1) through pipelines. The outlet of the variable pump (2.1) is communicated with the first oil circuit, the second oil circuit and the fourth oil circuit through a pipeline.

3. The walking hydraulic system of a spraying machine according to claim 2, characterized in that, The cooling valve (3) includes a directional control valve (3.1) and a second overflow valve (3.2). The fourth oil circuit is communicated with the control port of the directional control valve (3.1). The inlet of the directional control valve (3.1) is communicated with the inlet of the variable pump (2.1) through a pipeline. The outlet of the directional control valve (3.1) is communicated with the inlet of the second overflow valve (3.2) through a pipeline. The outlet of the second overflow valve (3.2) is communicated with the return pipeline (15) through a pipeline.

4. The walking hydraulic system of a spraying machine according to claim 2, wherein, A filter (2.4) is provided on the oil outlet pipeline (14).

5. The walking hydraulic system of a spraying machine according to claim 2, wherein, The first solenoid valve group (4) includes a first solenoid valve A (4.1) and a first solenoid valve B (4.2). The inlets of the first solenoid valve A (4.1) and the first solenoid valve B (4.2) are both communicated with the first oil circuit. The outlets of the first solenoid valve A (4.1) and the first solenoid valve B (4.2) are respectively communicated with the inlets of the two rear-wheel two-speed motors.

6. The walking hydraulic system of a spraying machine according to claim 2, characterized in that, The second solenoid valve group (5) includes a second solenoid valve A (5.1) and a second solenoid valve B (5.2). The oil outlets of the two front-wheel two-speed motors are respectively communicated with the oil inlets of the second solenoid valve A (5.1) and the second solenoid valve B (5.2) through pipelines, and the oil outlets of the second solenoid valve A (5.1) and the second solenoid valve B (5.2) are both communicated with the oil inlet of the variable pump (2.1).

7. A walking hydraulic system of a spraying machine according to any one of claims 1 to 6, characterized in that, The third solenoid valve group (6) includes a third solenoid valve A (6.1), a third solenoid valve B (6.2) and a third solenoid valve C (6.3). The third oil circuit is communicated with the oil inlets of the third solenoid valve A (6.1), the third solenoid valve B (6.2) and the third solenoid valve C (6.3). The oil outlet of the third solenoid valve A (6.1) is communicated with the displacement controllers of the two front-wheel two-speed motors respectively through pipelines, and the oil outlet of the third solenoid valve C (6.3) is communicated with the displacement controllers of the two rear-wheel two-speed motors respectively through pipelines; the oil outlet of the third solenoid valve B (6.2) is communicated with the braking ports of the two front-wheel two-speed motors and the two rear-wheel two-speed motors respectively through pipelines.

8. The walking hydraulic system of a spraying machine according to claim 7, characterized in that, It further includes a manual pump (13). The oil inlet of the manual pump (13) is communicated with the fuel tank (16) through a pipeline, and the oil outlet of the manual pump (13) is communicated with the braking ports of the two front-wheel two-speed motors and the two rear-wheel two-speed motors respectively through pipelines.

9. The walking hydraulic system of a spraying machine according to claim 8, wherein, A stop valve (11) is provided on the pipeline of the oil outlet of the third solenoid valve B (6.2).

10. A spraying machine, characterized in that, It includes the spraying machine traveling hydraulic system according to any one of claims 1 to 9.

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