Topological structure and operation mode of an electric hydraulic coupling harvester

Abstract

The topology of an electro-hydraulic coupled harvester includes a header electric drive system, which uses a chain drive to drive the reel, cutter blade, and header auger to harvest crops. The threshing unit electric drive system, which uses a chain drive to drive the feed and threshing drums to separate straw and grain, is driven by the header electric motor. The hydraulic travel system, which uses a methane engine through a torque coupling device to convert a portion of its power into high-pressure oil through a hydraulic pump, is fed into an electronically controlled hydraulic valve group to control the hub hydraulic motor system, driving the harvester. The cleaning unit electric drive system, which uses a cleaning unit electric motor to drive the cleaning fan and vibrating screen to sort grain and crop straw, is driven by this topology. This electro-hydraulic coupled harvester uses a chain drive instead of a belt drive to achieve independent speed control of each working component, shorten the power transmission chain, and achieve energy-saving operation.

Description

Technical Field

[0001] The present invention relates to the field of agricultural machinery, and in particular to an electric-hydraulic coupled harvester topology structure. Each operating system of the electric-hydraulic coupled harvester adopting the above-mentioned topology structure is driven independently by an electric motor, and a chain drive is used instead of a belt drive to shorten the power transmission chain and achieve the purpose of energy-saving operation. Background Art

[0002] my country has a vast area of ​​arable land and a large area of ​​grain cultivation, primarily rice, wheat, and corn. Crop harvesting and storage is the final, crucial step in the grain production process, characterized by strong seasonality, heavy workload, and susceptibility to severe wind and rain disasters. To ensure smooth grain harvesting and storage and minimize losses, harvesters play a vital role in the grain harvesting process. Currently, my country is experiencing rapid agricultural modernization and mechanization, with a wide range of mechanized agricultural machinery being deployed on a large scale, and the intelligence level of various types of modern agricultural machinery is constantly improving. Traditional harvesters primarily rely on internal combustion engines as power output devices, transmitting power to operating components through various complex mechanical transmissions. Mechanical transmission accounts for a significant portion of the operation, resulting in complex transmission systems and long power transmission chains. This results in low transmission efficiency, high failure rates, and complex maintenance.

[0003] Modern agriculture is increasingly demanding efficient and energy-saving agricultural machinery. Low-noise, pollution-free, and energy-efficient green agricultural machinery has become a research focus in related disciplines. For harvesters, researchers are attempting to replace traditional fuel-powered systems with pure electric drive systems, but due to power and range requirements, a satisfactory solution has yet to be found. Summary of the Invention

[0004] The purpose of the present invention is to propose an electric-hydraulic coupled harvester topology and operating mode, which can realize that the harvester's cutting table electric drive system, threshing device electric drive system, cleaning device electric drive system and other operating systems are driven by independent electric motors, and the hydraulic drive walking system is driven by the hub hydraulic motor system, so as to realize independent control of the speed of each operating system of the harvester, shorten the power transmission chain, improve the transmission efficiency, ensure the power and endurance requirements of the harvester, and at the same time achieve the purpose of energy-saving operation of the harvester.

[0005] In order to achieve the above purpose, the scheme adopted by the present invention is: an electric hydraulic coupling harvester topology structure and operation mode, the topology structure includes a cutter 1, a reel 2, a cutter auger 3, a cutter conveying device 4, a cutter hydraulic lifting device 5, a torque coupling device 6, a methane engine 7, a hydraulic pump, an electronically controlled hydraulic valve group 8, a hub hydraulic motor system 9, a vibrating screen 10, a cleaning fan 11, a cleaning device motor 12, a threshing device motor 13, a threshing drum gap adjustment 15, a feeding roller 18, a power battery 18, a generator 19, a cutter device motor 20 and a cutter drive device 21; the above-mentioned topology structure constitutes the harvester's cutter electric drive system, threshing device electric drive system, threshing device electric drive system and other operating systems and a hydraulic drive walking system.

[0006] The generator 19 described in the present invention is electrically connected to the power battery 18, the harvesting table device motor 20, the threshing device motor 13, and the cleaning device motor 12 respectively; the generator 19 generates electricity to power the harvesting table device motor 20, the threshing device motor 13 and the cleaning device motor 12, and drives the various operating systems of the harvester to work; when the harvester is working at a low load and the charge state value of the power battery 18 is low, the generator 19 outputs excess electricity and stores it in the power battery 18. When the harvester is working at a high load, the power battery 18 and the generator 19 simultaneously power the motors in the operating system to ensure the smooth operation of the harvester when working at a high load.

[0007] The motor 20 of the cutting table device of the present invention is chain-driven to the cutter 1, the reel 2 and the cutting table auger 3; the motor 13 of the threshing device is chain-driven to the feed roller; the hydraulic pump 17 and the electronically controlled hydraulic valve group 8, and the electronically controlled hydraulic valve group 8 and the wheel hub hydraulic motor system are connected by hydraulic pipelines.

[0008] The electric drive system for the harvesting platform of the present invention includes a harvesting platform motor 20, a cutter driving device 21, a cutter 1, a reel 2, a harvesting platform auger 3, a harvesting platform conveying device 4 and a harvesting platform hydraulic lifting device 5; a three-stage flywheel group is installed on the output shaft of the harvesting platform motor, and the three-stage flywheel group is connected to the harvester 1, the reel 2 and the harvesting platform auger 3 through a chain, driving the harvester 1, the reel 2 and the harvesting platform auger 3 to work and harvest crops; the output shaft of the harvesting platform motor directly drives the harvesting platform conveying device 4 to work and transport the harvested crops to the feeding roller 16; the harvesting platform hydraulic lifting device 5 controls the spatial position state of the entire harvesting platform electric drive system.

[0009] The electric drive system of the threshing device of the present invention includes a threshing device motor 13, a threshing drum 14, a threshing drum gap adjustment mechanism 15 and a feeding drum 16; a flywheel is installed on the output shaft of the threshing device motor 13, which is connected to the feeding drum 16 through a chain, and the crops transported by the cutting table conveying device 4 are fed into the threshing drum 14; the output shaft of the threshing device motor 13 drives the threshing drum 14 through gear engagement.

[0010] The electric drive system of the cleaning device of the present invention includes a cleaning device motor 12, a cleaning fan 11 and a vibrating screen 10; the cleaning fan 11 is directly installed on the output shaft of the cleaning device motor 12, and the cleaning device motor 12 drives the vibrating screen 10 to work through a cam-connecting rod combination mechanism.

[0011] The methane engine 7 described in the present invention serves as both an energy replenishment device and a power source for driving the walking system. The power output by the methane engine 7 drives the generator 19 to generate electricity through the torque coupling device 6, and then drives the harvesting device motor 20, the threshing device motor 13, and the cleaning device motor 12 to work and store the excess electricity in the power battery 18. The other part of the power is converted into hydraulic energy through the hydraulic pump 17, and the harvester travel is controlled through the electronically controlled hydraulic valve group 8.

[0012] The present invention also provides an electric-controlled hydraulic valve group for an electric-hydraulic coupled harvester, wherein the electric-controlled hydraulic valve group 8 comprises a quantitative hydraulic pump 8-1, a two-position four-way hydraulic valve 8-2, four first two-position two-way hydraulic valves 8-4, a second two-position two-way hydraulic valve 8-5, a third two-position two-way hydraulic valve 8-11 and a fourth two-position two-way hydraulic valve 8-12 of the same structure, a three-position four-way hydraulic valve 8-6, two first relief valves 8-9 and a second relief valve 8-15 of the same structure, an electro-hydraulic proportional valve 8- 10. The first one-way valve 8-3, the second one-way valve 8-13, the accumulator 8-14, the oil tank 8-17, the hydraulic sensor 8-19 and the controller 8-20; wherein the first two-position two-way hydraulic valve 8-4 and the second two-position two-way hydraulic valve 8-5 constitute a hydraulic coupling valve group 8-18; the third two-position two-way hydraulic valve 8-11, the fourth two-position two-way hydraulic valve 8-12, the second one-way valve 8-13 and the electro-hydraulic proportional valve 8-10 constitute a reversing valve group 8-16 with a proportional adjustment function.

[0013] The electronically controlled hydraulic valve group 8 described in the present invention can realize that when the harvester is idling, if the accumulator pressure is lower than the limit value, the quantitative hydraulic pump works to store energy in the accumulator; if the accumulator pressure is maintained at the limit value, the quantitative hydraulic pump stops working; when the harvester is working, if the quantitative hydraulic pump works stably and can output constant-pressure high-pressure oil, the quantitative hydraulic pump drives the variable hydraulic motor installed on the wheel hub to work; if the quantitative hydraulic pump is affected by the speed change of the methane engine 7 and cannot output constant-pressure hydraulic oil, and the hydraulic sensor installed in the high-pressure oil circuit detects that the oil pressure in the high-pressure oil circuit is unstable, the controller controls the accumulator and the quantitative hydraulic pump to output high-pressure oil at the same time, and adjusts the oil pressure output of the accumulator according to the oil pressure state in the high-pressure oil circuit, driving the variable hydraulic motor to work stably; when the harvester needs to reverse, the high-pressure oil circuit is reversed by the three-position four-way hydraulic valve, thereby driving the wheel hub hydraulic motor system to reverse, thereby realizing the reversal of the harvester.

[0014] The beneficial effects of the electric hydraulic coupling harvester of the present invention are:

[0015] (1) The methane engine serves as both an energy supplement device and a power source for the driving system. It ensures the power of the harvester while meeting the endurance requirements of the harvester, thus achieving energy-saving operation and long endurance operation of the harvester.

[0016] (2) The harvester's operating systems, including the electric drive system for the harvesting platform, the electric drive system for the threshing device, and the electric drive system for the cleaning device, are driven by independent electric motors, which can achieve independent control of the speed of each operating system, making the harvester suitable for harvesting multiple types of crops.

[0017] (3) The output power of each motor in the electric drive system of the cutting platform, the electric drive system of the threshing device and the electric drive system of the cleaning device is directly transmitted to each working component through the chain drive, shortening the power transmission chain and improving the transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a topological diagram of an electric-hydraulic coupled harvester of the present invention;

[0019] Figure 2 This is a schematic diagram of an electronically controlled hydraulic valve group of the present invention;

[0020] Figure 3 The present invention is a hydraulic oil power transmission route diagram during the operation of the harvester.

[0021] Reference numerals: 1, cutter; 2, reel; 3, cutting platform auger; 4, cutting platform conveying device; 5, cutting platform hydraulic lifting device; 6, torque coupling device; 7, methane engine; 8, electronically controlled hydraulic valve group; 9, wheel hub hydraulic motor system; 10, vibrating screen; 11, cleaning fan; 12, cleaning device motor; 13, threshing device motor; 14, threshing drum; 15, threshing drum gap adjustment mechanism; 16, feeding drum; 17, hydraulic pump; 18, power battery; 19, generator; 20. Electric motor for the cutting table device; 21. Cutter drive device; 8-1. Fixed-displacement hydraulic pump; 8-2. Two-position four-way hydraulic valve; 8-3. First one-way valve; 8-4. First two-position two-way hydraulic valve; 8-5. Second two-position two-way hydraulic valve; 8-6. Three-position four-way hydraulic valve; 8-7. First bidirectional variable hydraulic motor; 8-8. Second bidirectional variable hydraulic motor; 8-9. First overflow valve; 8-10. Electro-hydraulic proportional valve; 8-11. Third two-position two-way hydraulic valve; 8-12. Fourth two-position two-way hydraulic valve; 8-13. Second one-way valve; 8-14. Accumulator; 8-15. Second overflow valve; 8-16. Reversing valve group; 8-17. Oil tank; 8-18. Hydraulic coupling valve group. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Reference Figure 1 The present invention discloses an electric-hydraulic coupled harvester topology, comprising a cutter blade 1; a reel 2; a harvester auger 3; a harvester conveyor 4; a harvester hydraulic lift 5; a torque coupling 6; a methane engine 7; an electronically controlled hydraulic valve assembly 8; a hub hydraulic motor system 9; a vibrating screen 10; a cleaning fan 11; a cleaning device motor 12; a threshing device motor 13; a threshing drum 14; a threshing drum gap adjustment mechanism 15; a feed drum 16; a generator 19; a hydraulic pump 17; a harvester motor 20; and a cutter blade drive 21. The topology comprises the harvester's electric drive system for the harvester, including the electric drive system for the threshing device, the electric drive system for the cleaning device, and the hydraulically driven travel system.

[0024] The generator 19 is electrically connected to the power battery 18, the header motor 20, the threshing motor 13, and the cleaning motor 12. The generator 19 generates electricity to power the header motors 20, threshing motors 13, and cleaning motors 12, driving the various operating systems of the harvester. When the harvester is operating at low loads and the power battery 18 has a low state of charge, the generator 19 outputs excess power, which is stored in the power battery 18. When the harvester is operating at high loads, the power battery 18 and the generator 19 simultaneously power the motors in the operating systems, ensuring smooth operation of the harvester under high loads. Chain transmission is used between the header motor 20 and the cutter 1, reel 2, and header auger 3. A chain transmission is used between the threshing motor 13 and the feed roller. Hydraulic lines connect the hydraulic pump 17 to the electronically controlled hydraulic valve group 8, and between the electronically controlled hydraulic valve group 8 and the wheel hub hydraulic motor system 9.

[0025] In the electric drive system for the harvester, the cutter blade 1, reel 2, and harvester auger 3 are mounted at the front end of the harvester and are connected to the harvester motor 20 via a chain drive system. The harvester motor 20 outputs power through the chain drive system to drive the connected cutter blade 1, reel 2, and harvester auger 3. Simultaneously, the output shaft of the harvester motor 20 is directly connected to the drive shaft of the harvester conveyor 4, driving the harvester conveyor 4 to transport the harvested crops to the threshing device. In the electric drive system for the threshing device, the feed roller 16 is connected to the threshing device motor 13 via a chain drive system. The output shaft of the threshing device motor 13 meshes with the drive shaft of the threshing drum 14 via a cross gear. The power output of the threshing device motor 13 drives the feed roller 16 through the chain drive system to feed the crops output from the harvester conveyor 4 into the threshing drum 14. The power output of the threshing device motor 13 then drives the threshing drum 14 to separate the straw and grain from the crops. After threshing, the crops are further transported to the electric drive system for the cleaning device. The cleaning fan 11 in the electric drive system of the cleaning device is directly installed on the output shaft of the cleaning device motor 12. At the same time, the cleaning device motor 12 also drives the vibrating screen 10 to work through the cam-connecting rod combination mechanism. The crops separated from the grains and straw in the threshing device are further screened in the cleaning device. The vibrating screen 10 collects the grains in the storage bin through vibration, and the straw is blown out of the harvester by the cleaning fan 11.

[0026] The hydraulically driven walking system is mainly driven by the methane engine 7 outputting power through the torque coupling device 6 to drive the hydraulic pump 17 to generate high-pressure oil, which flows into the electronically controlled hydraulic valve group 8 through the hydraulic pipeline. The electronically controlled hydraulic valve group 8 controls the wheel hub hydraulic motor system 9 to drive the harvester to move.

[0027] When the electric-hydraulic coupled harvester is working, the methane engine 7 serves as both an energy replenishment device and a power source for driving the walking system. The methane engine 7 converts part of the power from the generator 19 into electrical energy through the torque coupling device 6 and stores it in the power battery 18, which is used to power the various operating systems of the harvester. The other part of the power is converted into hydraulic energy through the hydraulic pump 17 and controls the movement of the harvester through the electronically controlled hydraulic valve group 8.

[0028] Reference Figure 2 The hydraulic drive travel system of the electro-hydraulic coupled harvester adopting the above-mentioned topological structure is driven and controlled by the electro-hydraulic valve group 8 on the two bidirectional variable hydraulic motors installed on the driving wheels. The electro-hydraulic valve group 8 includes a two-position four-way hydraulic valve 8-2, four identical first two-position two-way hydraulic valves 8-4, second two-position two-way hydraulic valves 8-5, third two-position two-way hydraulic valves 8-11 and fourth two-position two-way hydraulic valves 8-12, a three-position four-way hydraulic valve 8-6, two identical first overflow valves 8-9 and second overflow valves 8-15, an electro-hydraulic proportional valve 8-10, a second one-way valve 8-13, an accumulator 8-14, an oil tank 8-17 and a quantitative hydraulic pump 8-1 (i.e. Figure 1The hydraulic pump 17 in the figure); wherein the oil outlet of the quantitative hydraulic pump 8-1 is connected to the P port of the two-position four-way hydraulic valve 8-2 through a hydraulic pipeline; the C port of the two-position four-way hydraulic valve 8-2 is connected to the E port of the first two-position two-way hydraulic valve 8-4 through a hydraulic pipeline and a first one-way valve 8-3 is provided on the hydraulic pipeline, the D port of the two-position four-way hydraulic valve 8-2 is simultaneously connected to the H port of the second two-position two-way hydraulic valve 8-5 and the R port of the reversing valve group 8-16, and the O port of the two-position four-way hydraulic valve 8-2 is blocked by a sealing device; the reversing valve group 8-16 includes an electro-hydraulic proportional valve 8-10, a two-position two-way hydraulic valve, a third two-position two-way hydraulic valve 8-11 and a fourth two-position two-way hydraulic valve 8-12, the second one-way valve 8-13, the electro-hydraulic proportional valve 8-10 and the third two-position two-way hydraulic valve 8-11 connected in series are connected in parallel with the fourth two-position two-way hydraulic valve 8-12 and the second one-way valve 8-13 connected in series, the inlet of the one-way valve is connected to the outlet of the fourth two-position two-way hydraulic valve 8-12, the outlet of the one-way valve is the S port of the reversing valve group, and the inlet of the fourth two-position two-way hydraulic valve 8-12 is the R port of the reversing valve group; the F port of the first two-position two-way hydraulic valve 8-4, the I port of the second two-position two-way hydraulic valve 8-5 and the K port of the first relief valve 8-9 in the hydraulic coupling valve group 8-18 are all connected to the A port of the three-position four-way hydraulic valve 8-6 through a hydraulic pipeline. connection; the hydraulic sensor 8-19 is installed on the hydraulic pipeline connected to the A port of the three-position four-way hydraulic valve, and transmits the pressure value in the hydraulic pipeline to the controller 8-20; the S port of the reversing valve group 8-16 is connected to the accumulator 8-14 and the T port of the second relief valve 8-15 through hydraulic pipelines; the J port of the first relief valve 8-9, the B port of the three-position four-way hydraulic valve 8-6, and the Q port of the second relief valve 8-15 are all connected to the oil tank 8-17 through hydraulic pipelines; the hub hydraulic motor system includes a first two-way variable hydraulic motor 8-7 and a second two-way variable hydraulic motor 8-8 installed oppositely on the drive hub of the harvester, and the M ports of the three-position four-way hydraulic valve are respectively It is connected to the oil port of the first bidirectional variable hydraulic motor 8-7 and the oil port of the second bidirectional variable hydraulic motor 8-8 through hydraulic pipelines, and the N port of the three-position four-way hydraulic valve is respectively connected to the other oil port of the first bidirectional variable hydraulic motor 8-7 and the other oil port of the second bidirectional variable hydraulic motor 8-8 through hydraulic pipelines, thereby forming a dual-circuit control, specifically: Circuit ①, the hydraulic oil flows from the M port of the three-position four-way hydraulic valve into the two bidirectional variable hydraulic motors, and then flows back to the oil tank from the N port and B port of the three-position four-way hydraulic valve; Circuit ②, the hydraulic oil flows from the N port of the three-position four-way hydraulic valve into the two bidirectional variable hydraulic motors, and then flows back to the oil tank from the M port and B port of the three-position four-way hydraulic valve.The controller is electrically connected to the two-position four-way hydraulic valve 8-2, the first two-position two-way hydraulic valve 8-4, the second two-position two-way hydraulic valve 8-5, the third two-position two-way hydraulic valve 8-11 and the fourth two-position two-way hydraulic valve 8-12, the electro-hydraulic proportional valve 8-10, and the three-position four-way hydraulic valve 8-6 to control the state of each hydraulic valve and realize the control of the flow direction of high-pressure oil of the electronically controlled hydraulic valve group 8.

[0029] Reference Figure 3 In different operating states of the harvester, the electronically controlled hydraulic valve group 8 adjusts the working state of the quantitative hydraulic pump 8-1 and the flow direction of the high-pressure oil according to the operating state of the harvester. When the harvester is idling, if the accumulator pressure is maintained at the maximum limit, the quantitative hydraulic pump 8-1 stops running; if the accumulator 8-14 pressure is lower than the maximum limit, refer to Figure 3 (a), the quantitative hydraulic pump 8-1 is working, at this time, the two-position four-way hydraulic valve 8-2 is in the right position, the first two-position two-way hydraulic valve 8-4 and the second two-position two-way hydraulic valve 8-5 are in the left position, the three-position four-way hydraulic valve 8-6 is in the middle position, the third two-position two-way hydraulic valve 8-11 is in the left position, and the fourth two-position two-way hydraulic valve 8-12 is in the right position. The hydraulic oil output from the quantitative hydraulic pump 8-1 is input into the accumulator through the P port and D port of the two-position four-way hydraulic valve 8-2 and the R port and S port of the reversing valve group 8-16, and the energy is stored in the accumulator; when the harvester is running, refer to Figure 3 (b) The quantitative hydraulic pump 8-1 is running. At this time, the two-position four-way hydraulic valve 8-2 is in the left position, the first two-position two-way hydraulic valve 8-4 is in the right position, the second two-position two-way hydraulic valve 8-5 is in the left position, the third two-position two-way hydraulic valve 8-11 and the fourth two-position two-way hydraulic valve 8-12 are in the left position, and the three-position four-way hydraulic valve 8-6 is in the left position. The hydraulic oil output from the quantitative hydraulic pump 8-1 passes through the P port and C port of the two-position four-way hydraulic valve 8-2, the E port and F port of the first two-position two-way hydraulic valve 8-4, and the three-position four-way hydraulic valve The A and M ports of 8-6 are input into the high-pressure circuit of the hub hydraulic motor system, and finally flow back to the oil tank 8-17 through the N and B ports of the three-position four-way hydraulic valve 8-6; during the operation of the harvester, if the speed of the methane engine 7 is unstable, resulting in unstable oil pressure of the high-pressure oil output by the quantitative hydraulic pump 8-1, the hydraulic sensor 8-19 obtains the hydraulic value in the high-pressure oil circuit and transmits it to the controller. After calculation, the controller adjusts the output ratio of the electro-hydraulic proportional valve, and the electronically controlled hydraulic valve group 8 starts the quantitative hydraulic pump-accumulator drive mode. Figure 3(c) The two-position four-way hydraulic valve 8-2 is in the left position, the first two-position two-way hydraulic valve 8-4, the second two-position two-way hydraulic valve 8-5, and the third two-position two-way hydraulic valve 8-11 are all in the right position, the fourth two-position two-way hydraulic valve 8-12 is in the left position, and the three-position four-way hydraulic valve 8-6 is in the right position. The hydraulic oil output from the quantitative hydraulic pump passes through the P port and C port of the two-position four-way hydraulic valve to the E port and F port of the first two-position two-way hydraulic valve 8-4. The high-pressure oil output from the accumulator 8-14 passes through the S port of the reversing valve group 8-16 and is discharged to the electro-hydraulic proportional valve 8-1 of the reversing valve group 8-16. 0, the high-pressure oil output in a specified proportion is input from the R port of the reversing valve group 8-16 to the H port of the second two-position two-way hydraulic valve 8-5. The hydraulic oil output from the quantitative hydraulic pump 8-1 and the accumulator 8-14 is coupled in the hydraulic coupling valve group 8-18 to output high-pressure hydraulic oil and low-pressure hydraulic oil. The high-pressure hydraulic oil is input into the high-pressure circuit of the hub hydraulic motor system through the A port and M port of the three-position four-way hydraulic valve 8-6, and the low-pressure hydraulic oil flows back to the oil tank 8-17 through the N port and B port of the three-position four-way hydraulic valve 8-6. When the harvester needs to reverse, the hub hydraulic motor system reverses. Figure 3 (d) The quantitative hydraulic pump 8-1 is working, the two-position four-way hydraulic valve 8-2 is in the left position, the first two-position two-way hydraulic valve 8-4 is in the right position, the second two-position two-way hydraulic valve 8-5 is in the left position, the third two-position two-way hydraulic valve 8-11 and the fourth two-position two-way hydraulic valve 8-12 are in the left position, and the three-position four-way hydraulic valve 8-6 is in the right position. The hydraulic oil output from the quantitative hydraulic pump 8-1 is input into the high-pressure circuit of the wheel hub hydraulic motor system through the P port and C port of the two-position four-way hydraulic valve 8-2, the E port and F port of the first two-position two-way hydraulic valve 8-4, and the A port and N port of the three-position four-way hydraulic valve 8-6. The low-pressure oil output from the wheel hub hydraulic motor system flows back to the oil tank 8-17 through the M port and B port of the three-position four-way hydraulic valve 8-6.

[0030] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention is described in detail with reference to the preferred embodiment, those skilled in the art will understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, and all such modifications and equivalents shall be encompassed by the claims of the present invention. The shapes, structures, and control strategies not described in detail in the present invention are well known in the art.

Claims

1. An electric hydraulic coupling harvester operation mode, characterized by The electronically controlled hydraulic valve group adjusts the working state of the quantitative hydraulic pump and the flow direction of the high-pressure oil according to the operating state of the harvester; When the harvester is idling, if the accumulator pressure is lower than the maximum limit, the quantitative hydraulic pump will work to store energy in the accumulator. If the accumulator pressure is maintained at the maximum limit, the quantitative hydraulic pump will stop working. When the harvester is working, if the quantitative hydraulic pump works stably and can output constant-pressure hydraulic oil, the bidirectional variable hydraulic motor installed on the wheel hub is driven by the quantitative hydraulic pump; during the operation of the harvester, if the quantitative hydraulic pump is affected by the change in the speed of the methane engine and cannot output constant-pressure hydraulic oil, and the hydraulic sensor installed in the hydraulic oil circuit detects that the oil pressure in the hydraulic oil circuit is unstable, the controller controls the accumulator and the quantitative hydraulic pump to output hydraulic oil at the same time, and adjusts the oil pressure output of the accumulator according to the oil pressure state in the hydraulic oil circuit to drive the bidirectional variable hydraulic motor to work stably; When the harvester is reversing, the hydraulic oil circuit is reversed through the three-position four-way hydraulic valve, thereby driving the bidirectional variable hydraulic motor to reverse and realize the reversal of the harvester; The above-mentioned operation mode is realized by adopting an electric hydraulic coupling type harvester topology structure, wherein the electric hydraulic coupling type harvester topology structure comprises a cutting platform electric drive system, a threshing device electric drive system, a hydraulic drive walking system and a cleaning device electric drive system; the cutting platform electric drive system comprises a cutting knife (1), a reel (2), a cutting platform augers (3), a cutting platform conveying device (4), a cutting platform hydraulic lifting device (5), a cutting platform device motor (20), and a cutting knife drive device (21), wherein the cutting platform device motor drives the cutting knife, the reel and the cutting platform augers respectively through a chain transmission system; the threshing device electric drive system comprises a threshing device motor (13), a threshing drum (14), a threshing drum gap adjustment mechanism (15), a feeding mechanism (16), a feeding mechanism (17), a feeding mechanism (18), a feeding mechanism (19), a feeding mechanism (21), a feeding mechanism (22), a feeding mechanism (23), a feeding mechanism (24), a feeding mechanism (25), a feeding mechanism (26), a feeding mechanism (27), a feeding mechanism (28), a feeding mechanism (29), a feeding mechanism (29), a feeding mechanism (21 ...9), a feeding mechanism (29), a feeding mechanism (29), a feeding mechanism (29), a feeding mechanism (29), a feeding mechanism (29), a feeding The feeding drum (16) is driven by the threshing device motor through the chain transmission system; the electric drive system of the cleaning device includes a vibrating screen (10), a cleaning fan (11), and a cleaning device motor (12); the hydraulic drive walking system includes an electronically controlled hydraulic valve group (8), a wheel hub hydraulic motor system (9), and a hydraulic pump (17); the output end of the methane engine is connected to the torque coupling device (6), and the output end of the torque coupling device is respectively connected to the generator (19) and the hydraulic pump (17); the generator is respectively electrically connected to the cleaning device motor, the threshing device motor, the power battery, and the cutting table device motor; the hydraulic pump and the electronically controlled hydraulic valve group, and the electronically controlled hydraulic valve group and the wheel hub hydraulic motor system are all connected through hydraulic pipelines; The electronically controlled hydraulic valve group includes a fixed displacement hydraulic pump (8-1), a two-position four-way hydraulic valve (8-2), a first one-way valve (8-3) and a second one-way valve (8-13), a first two-position two-way hydraulic valve (8-4), a second two-position two-way hydraulic valve (8-5), a third two-position two-way hydraulic valve (8-11) and a fourth two-position two-way hydraulic valve (8-12), a three-position four-way hydraulic valve (8-6), a first overflow valve (8-9) and a second overflow valve (8-15), an electro-hydraulic proportional valve (8-10), an accumulator (8 -14), an oil tank (8-17), a hydraulic sensor (8-19) and a controller (8-20); the quantitative hydraulic pump is the aforementioned hydraulic pump, the first two-position two-way hydraulic valve (8-4) and the second two-position two-way hydraulic valve (8-5) constitute a hydraulic coupling valve group (8-18), the third two-position two-way hydraulic valve (8-11) and the fourth two-position two-way hydraulic valve (8-12), the second one-way valve (8-13), and the electro-hydraulic proportional valve (8-10) constitute a reversing valve group (8-16) with a proportional adjustment function; The oil outlet of the quantitative hydraulic pump (8-1) is connected to the P port of the first two-position two-way hydraulic valve (8-4) through a hydraulic pipeline; the C port of the two-position four-way hydraulic valve (8-2) is connected to the E port of the first two-position two-way hydraulic valve (8-4) through a hydraulic pipeline, and a first one-way valve (8-3) is provided on the hydraulic pipeline; the D port of the two-position four-way hydraulic valve (8-2) is respectively connected to the H port of the second two-position two-way hydraulic valve (8-5) and the R port of the reversing valve group (8-16) through hydraulic pipelines; the O port of the two-position four-way hydraulic valve (8-2) is connected through a sealing device The F port of the first two-position two-way hydraulic valve (8-4), the I port of the second two-position two-way hydraulic valve (8-5), and the K port of the first relief valve (8-9) in the hydraulic coupling valve group (8-18) are connected to the A port of the three-position four-way hydraulic valve (8-6) through a hydraulic pipeline, and a hydraulic sensor (8-19) is installed on the hydraulic pipeline for obtaining the pressure value of the hydraulic oil in the hydraulic pipeline and transmitting it to the controller; the S port of the reversing valve group (8-16) is connected to the T port of the accumulator (8-14) and the second relief valve (8-15) through a hydraulic pipeline. The J port of the first relief valve (8-9), the B port of the three-position four-way hydraulic valve (8-6), and the Q port of the second relief valve (8-15) are all connected to the oil tank (8-17) through a hydraulic pipeline; the wheel hub hydraulic motor system includes a first two-way variable hydraulic motor (8-7) and a second two-way variable hydraulic motor (8-8) installed oppositely on the harvester drive wheel hub, and the M port of the three-position four-way hydraulic valve is respectively connected to the oil port of the first two-way variable hydraulic motor (8-7) and the oil port of the second two-way variable hydraulic motor (8-8) through a hydraulic pipeline. The N port of the three-position four-way hydraulic valve is respectively connected to the other oil port of the first two-way variable hydraulic motor (8-7) and the other oil port of the second two-way variable hydraulic motor (8-8) through hydraulic pipelines, thereby forming a dual-circuit control; the controller is respectively electrically connected to the two-position four-way hydraulic valve (8-2), the first two-position two-way hydraulic valve (8-4), the second two-position two-way hydraulic valve (8-5), the third two-position two-way hydraulic valve (8-11), the fourth two-position two-way hydraulic valve (8-12), the electro-hydraulic proportional valve (8-10), and the three-position four-way hydraulic valve (8-6).

2. The operating mode of an electric-hydraulic coupled harvester according to claim 1, characterized in that A three-stage flywheel group is installed on the output shaft of the motor (20) of the cutting table device. The three-stage flywheel group is respectively connected to the input shaft of the cutter drive device (21), the drive shaft of the reel (2), and the drive shaft of the cutting table auger (3) through corresponding chains; the output shaft of the motor of the cutting table device is also connected to the drive shaft of the cutting table conveying device (4).

3. The operating mode of an electric-hydraulic coupled harvester according to claim 1, characterized in that A flywheel is mounted on the output shaft of the threshing device motor (13), and the flywheel is connected to the driving shaft of the feeding drum (16) through a chain; the threshing device motor (13) drives the threshing drum (14) through gear meshing.

4. The operating mode of an electric-hydraulic coupled harvester according to claim 1, characterized in that When the electric-hydraulic coupled harvester is working, the methane engine serves as both an energy replenishment device and a power source for the hydraulically driven walking system. The methane engine converts part of the power output during operation from the generator into electrical energy through the torque coupling device and stores it in the power battery for supplying the various operating systems of the harvester. The other part of the power is converted into hydraulic energy through the hydraulic pump, and the wheel hub hydraulic motor system is controlled by the electronically controlled hydraulic valve group to drive the harvester to move.

5. The operating mode of an electric-hydraulic coupled harvester according to claim 1, characterized in that When the harvester is idling, if the accumulator pressure is lower than the maximum limit, the quantitative hydraulic pump works. At this time, the two-position four-way hydraulic valve (8-2) is in the right position, the first two-position two-way hydraulic valve (8-4) and the second two-position two-way hydraulic valve (8-5) are in the left position, the three-position four-way hydraulic valve (8-6) is in the middle position, the third two-position two-way hydraulic valve (8-11) is in the left position, and the fourth two-position two-way hydraulic valve (8-12) is in the right position. The hydraulic oil output from the quantitative hydraulic pump (8-1) is input into the accumulator through the P port and D port of the two-position four-way hydraulic valve (8-2) and the R port and S port of the reversing valve group (8-16), and the energy is stored in the accumulator.

6. An operating mode of an electric hydraulic coupling harvester according to claim 1, characterized in that when the harvester is working, the working process of the quantitative hydraulic pump driving the bidirectional variable hydraulic motor alone is as follows: the quantitative hydraulic pump is running, at this time, the two-position four-way hydraulic valve (8-2) is in the left position, the first two-position two-way hydraulic valve (8-4) is in the right position, the second two-position two-way hydraulic valve (8-5) is in the left position, the third two-position two-way hydraulic valve (8-11) and the fourth two-position two-way hydraulic valve (8-12) are in the left position, and the three-position four-way hydraulic valve (8-6) is in the left position, the hydraulic oil output from the quantitative hydraulic pump (8-1) is input into the high-pressure circuit of the wheel hub hydraulic motor system through the P port and the C port of the two-position four-way hydraulic valve (8-2), the E port and the F port of the first two-position two-way hydraulic valve (8-4) and the A port and the M port of the three-position four-way hydraulic valve (8-6), and finally flows back to the oil tank (8-17) through the N port and the B port of the three-position four-way hydraulic valve (8-6); When the harvester is working, the accumulator and the quantitative hydraulic pump jointly drive the working process of the bidirectional variable hydraulic motor as follows: the quantitative hydraulic pump is running, the two-position four-way hydraulic valve (8-2) is in the left position, the first two-position two-way hydraulic valve (8-4), the second two-position two-way hydraulic valve (8-5), and the third two-position two-way hydraulic valve (8-11) are all in the right position, the fourth two-position two-way hydraulic valve (8-12) is in the left position, and the three-position four-way hydraulic valve (8-6) is in the right position. The hydraulic oil output from the quantitative hydraulic pump is input to the E port of the first two-position two-way hydraulic valve (8-4) through the P port and C port of the two-position four-way hydraulic valve (8-2), and then The high-pressure oil output from the accumulator (8-14) is output through the S port of the reversing valve group (8-16) and the high-pressure oil of the specified proportion is output from the R port of the reversing valve group (8-16) under the regulation of the electro-hydraulic proportional valve (8-10) and input to the H port of the second two-position two-way hydraulic valve (8-5). The hydraulic oil output from the quantitative hydraulic pump and the accumulator is coupled in the hydraulic coupling valve group (8-18) to output high-pressure hydraulic oil and low-pressure hydraulic oil. The high-pressure hydraulic oil is input into the high-pressure circuit of the hub hydraulic motor system through the A port and the M port of the three-position four-way hydraulic valve, and the low-pressure hydraulic oil flows back to the oil tank (8-17) through the N port and the B port of the three-position four-way hydraulic valve.

7. The operating mode of an electric-hydraulic coupled harvester according to claim 1, characterized in that When the harvester is reversing, the quantitative hydraulic pump (8-1) is working, the two-position four-way hydraulic valve (8-2) is in the left position, the first two-position two-way hydraulic valve (8-4) is in the right position, the second two-position two-way hydraulic valve (8-5) is in the left position, the third two-position two-way hydraulic valve (8-11) and the fourth two-position two-way hydraulic valve (8-12) are in the left position, and the three-position four-way hydraulic valve (8-6) is in the right position. The hydraulic oil output from the quantitative hydraulic pump (8-1) is input into the high-pressure circuit of the hub hydraulic motor system through the P port and C port of the two-position four-way hydraulic valve (8-2), the E port and F port of the first two-position two-way hydraulic valve (8-4) and the A port and N port of the three-position four-way hydraulic valve (8-6), driving the bidirectional variable hydraulic motor to reverse, and the low-pressure oil output from the hub hydraulic motor system flows back to the oil tank (8-17) through the M port and B port of the three-position four-way hydraulic valve (8-6).

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