Hybrid hydraulic system, cotton picker and control method thereof

Abstract

The application discloses a hybrid hydraulic system, a cotton picker and a control method thereof, and comprises a pump group motor, a baling mechanism, a feeding mechanism, a beating mechanism, an engine, a second variable pump, a second constant pump, an auxiliary working mechanism, a steering gear, a controller assembly and a power battery. The feeding mechanism comprises a first variable pump, a first reversing valve, a first flow control valve, a shuttle valve and a feeder motor. The engine drives the auxiliary working mechanism and the steering gear through the second variable pump and the second constant pump respectively. The second variable pump is connected with the auxiliary working mechanism through a second one-way valve. The first variable pump is subjected to load pressure feedback through the shuttle valve, and the pressure and flow demand of the sensing system are sensed, so that appropriate working pressure can be maintained under different loads, the working efficiency and stability of the hydraulic system are improved, and energy saving is realized. The oil path flow direction is switched through the first reversing valve, the feeder system and the auxiliary pump system are switched, maintenance can be completed under the condition that the engine is off, and noise during maintenance can be reduced.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery technology, and in particular, to a hybrid hydraulic system. Furthermore, this invention also relates to a cotton harvester including the aforementioned hybrid hydraulic system. This invention further relates to a control method for the cotton harvester. Background Technology

[0002] Traditional cotton harvesters use an engine connected in series with a transfer case to distribute the engine's power to the travel pump, auxiliary pump, steering pump, baling pump, cotton harvesting pump, etc. A hydraulic pump then converts the mechanical energy into hydraulic energy. As the hydraulic oil flows through the hydraulic motor, it converts the hydraulic energy into mechanical energy, supplying power to the axle, cotton harvesting head, auxiliary system components, and steering gear. Figure 1 As shown. On the one hand, the cotton harvester requires engine power to perform any function, making it impossible to stop. The engine's workload is significant, especially when the auxiliary pump drives the cylinders, cotton-beating roller motor, cotton-exhausting motor, and feeding motor. The load differences between each action are large, requiring consideration of the actions of these actuators. The required pressure must be based on the highest pressure, and then variable based on the system flow requirements. A constant pressure variable pump is usually the optimal choice. For cylinders, although the required driving force of each mechanism differs greatly, the operation basically stops after the required action is completed, resulting in relatively less energy loss. However, for the cotton-beating roller and feeder, which require continuous operation during the baling process, the actual load is small, but the system operates under constant pressure, resulting in a large pressure difference across the control components. Most of the energy consumption is generated as heat, leading to significant energy loss and increased requirements for system heat dissipation. On the other hand, as the sole power source, the engine cannot perform any actions when it malfunctions. Furthermore, engine noise is unavoidable when the cotton harvester needs to move, perform maintenance on actuators, or relocate, creating a disturbance to residents. Summary of the Invention

[0003] This invention provides a hybrid hydraulic system to solve the technical problems of high energy consumption and high noise in existing hydraulically driven cotton harvesters.

[0004] According to one aspect of the present invention, a hybrid hydraulic system is provided, comprising a pump motor, a packing mechanism driven by the pump motor, a feeding mechanism driven by the pump motor, a cotton-removing mechanism driven by the pump motor, an engine, a second variable pump, a second fixed displacement pump, an auxiliary working mechanism, a steering gear, a controller assembly, and a power battery for powering the pump motor. The feeding mechanism includes a first variable pump, a first directional valve, a first flow control valve, a shuttle valve, and a feeder motor. The suction port of the first variable pump is connected to an oil tank, the outlet port of the first variable pump is connected to the first inlet port of the first directional valve, the first outlet port of the first directional valve is connected to the inlet port of the feeder motor via the first flow control valve, and the outlet port of the feeder motor is connected to an oil tank. The two oil inlets are connected to the auxiliary working mechanism. The second oil outlet of the first reversing valve is connected to the oil tank. The first oil inlet of the shuttle valve is connected to the second oil inlet of the first reversing valve. The second oil inlet of the shuttle valve is connected to the oil inlet of the feeder motor. The working port of the shuttle valve is connected to the load-sensitive oil port of the first variable pump. The engine drives the auxiliary working mechanism through the second variable pump. The engine drives the steering gear through the second fixed displacement pump. The second variable pump is connected to the auxiliary working mechanism through the second check valve. The auxiliary working mechanism is connected to the second oil inlet of the first reversing valve through the first check valve. The flow of the second check valve is opposite to that of the first check valve. The controller assembly is connected to the first reversing valve and the first flow control valve respectively.

[0005] Further, the cotton-beating mechanism includes a first metering pump, a second reversing valve, a second flow control valve, a pressure compensation valve, and a cotton-beating roller motor. The oil inlet of the first metering pump is connected to an oil tank, the oil outlet of the first metering pump is connected to the first oil inlet of the second reversing valve, the first oil outlet of the second reversing valve is connected to the oil inlet of the cotton-beating roller motor through the second flow control valve, the oil outlet of the cotton-beating roller motor is connected to an oil tank, the second oil inlet of the second reversing valve is connected to the steering gear, the second oil outlet of the second reversing valve is connected to an oil tank, the oil inlet of the pressure compensation valve is connected to the oil inlet of the second flow control valve, the oil outlet of the pressure compensation valve is connected to an oil tank, the regulating chamber of the pressure compensation valve is connected to the oil outlet of the second flow control valve, the second metering pump is connected to the steering gear through a fourth check valve, the steering gear is connected to the second oil inlet of the second reversing valve through a third check valve, the flow directions of the fourth check valve and the third check valve are opposite, and the controller assembly is connected to the second reversing valve and the second flow control valve respectively.

[0006] Furthermore, the packaging mechanism includes a packaging pump and a packaging motor driven by the packaging pump.

[0007] Furthermore, it also includes a generator, through which the engine is connected to the power battery.

[0008] Furthermore, a first relief valve is connected between the first oil inlet of the first reversing valve and the second oil outlet of the first reversing valve, and a second relief valve is connected between the first oil inlet of the second reversing valve and the second oil outlet of the second reversing valve.

[0009] According to another aspect of the present invention, a cotton harvester is also provided, which includes the above-described hybrid hydraulic system.

[0010] In addition, the invention also provides a control method for a cotton harvester, applicable to the aforementioned cotton harvester, which includes a composite mode, a transfer mode, and a pure electric mode.

[0011] Furthermore, in the composite mode, the engine drives the second variable pump and the second fixed pump. The pressure oil at the outlet of the second variable pump goes through the second check valve to the auxiliary working mechanism, driving the action of each cylinder and corresponding motor of the auxiliary working mechanism. The pressure oil at the outlet of the second fixed pump goes through the fourth check valve to the steering gear.

[0012] During the packing preparation stage, the pump set motor drives the packing pump, the first variable pump, and the first fixed displacement pump, which are in a low-speed standby condition. The pressure oil at the outlet of the first variable pump is cut off by the first directional valve to the first flow control valve. At the same time, the first and second inlets of the shuttle valve are connected to the oil tank and have no pressure, so the load-sensitive pressure port of the first variable pump also has no pressure. At this time, the first variable pump is in a low-pressure standby state, and the output flow maintains the leakage requirements of the first variable pump. The pressure oil at the outlet of the first fixed displacement pump is cut off by the second directional valve to the second flow control valve. The pressure before and after the second flow control valve acts on the pressure compensation valve. Since there is no pressure at the outlet of the second flow control valve, the system output pressure is low and it is in a low-pressure standby state.

[0013] During the packing process, the pump motor is increased to its rated operating speed, and the packing pump drives the packing motor, feeder motor, and cotton-beating roller motor to operate simultaneously. At this time, the pressure oil at the outlet of the first variable pump goes to the feeder motor through the first reversing valve and the first flow control valve. Simultaneously, the pressure at the load end of the feeder motor is automatically selected by the pressure at the first and second inlets of the shuttle valve to reach the load-sensitive port of the first variable pump. When the load increases, the first variable pump will automatically increase the output pressure to meet the load requirements. When the load decreases, the first variable pump will automatically reduce the output pressure to save energy. The pressure oil at the outlet of the first fixed-displacement pump goes to the cotton-beating roller motor through the second reversing valve and the second flow control valve. The pressure at the outlet of the second flow control valve and the combined force of the pressure compensation valve spring, together with the pressure before the second flow control valve, form a balance. For the execution system with a lower load, the first fixed-displacement pump also operates at a lower pressure at this time, and the excess flow is unloaded through the pressure compensation valve to reduce heat generation.

[0014] Furthermore, the transfer mode is used for equipment transfer operations, in which only the engine starts running, and the packing pump motor does not run.

[0015] Furthermore, the pure electric mode is used for specific environmental noise requirements or maintenance and relocation. The engine is in a shut-off state, and neither the second variable pump nor the second fixed displacement pump is working. The pump group motor relies entirely on the power battery for power. The controller assembly outputs a signal to control the first reversing valve and the second reversing valve to switch the oil flow direction. The pressure oil at the outlet of the first variable pump goes to the auxiliary working mechanism through the first reversing valve and the first check valve. The pressure oil at the outlet of the first fixed displacement pump goes to the steering gear through the second reversing valve and the third check valve.

[0016] The present invention has the following beneficial effects:

[0017] In the hybrid hydraulic system of this invention, during the packing preparation stage, the pump group motor drives the packing pump, the first variable pump, and the first fixed displacement pump in a low-speed standby state to reduce energy consumption. The corresponding motors are not activated. The pressure oil at the outlet of the first variable pump is cut off via the first directional valve to the first flow control valve. Simultaneously, the first inlet P5 and the second inlet P6 of the shuttle valve are connected to the oil tank, with no pressure. This also results in no pressure at the load-sensitive pressure port X of the first variable pump. At this time, the first variable pump is in a low-pressure standby state, and the output flow maintains the leakage requirements of the first variable pump. During the packing stage, the packing pump group motor is increased to its rated operating speed, and the feeder motor and the cotton-beating roller motor operate simultaneously. At this time, the pressure oil at the outlet of the first variable pump is cut off via the first directional valve and the first flow control valve to the feeder motor. Simultaneously, the pressure at the load end of the feeder motor is automatically selected via the first oil inlet P5 and the second oil inlet P6 of the shuttle valve to reach the load-sensitive oil port X of the first variable pump. When the load increases, the first variable pump automatically increases the output pressure to meet the load requirements; when the load decreases, the first variable pump automatically reduces the output pressure to save energy. The first variable pump provides load pressure feedback through the shuttle valve, senses the system's pressure and flow requirements, and provides the necessary pressure and flow. It can maintain a suitable working pressure under different loads, improve the working efficiency and stability of the hydraulic system, and thus reduce energy loss. By switching the oil flow direction through the first reversing valve, the feeder system and the auxiliary pump system can be switched, allowing maintenance to be completed when the engine is off, and reducing noise during maintenance.

[0018] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0020] Figure 1 This is a schematic diagram of the hydraulic system of a cotton harvester using existing technology;

[0021] Figure 2 This is a schematic diagram of a hybrid hydraulic system according to a preferred embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of a hybrid hydraulic system according to a preferred embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the controller assembly according to a preferred embodiment of the present invention;

[0024] Figure 5This is a schematic diagram of the connection of the shuttle valve according to a preferred embodiment of the present invention.

[0025] Legend:

[0026] 1. Pump motor; 2. Packing pump; 3. First variable pump; 4. First fixed displacement pump; 5. Engine; 6. Second variable pump; 7. Second fixed displacement pump; 8. First relief valve; 9. First directional valve; 10. First flow control valve; 11. Shuttle valve; 12. Second relief valve; 13. Second directional valve; 14. Pressure compensation valve; 15. Second flow control valve; 16. First check valve; 17. Second check valve; 18. Third check valve; 19. Fourth check valve; 20. Controller assembly; 21. Packing motor; 22. Feeder motor; 23. Cotton-beating roller motor; 24. Auxiliary working mechanism; 25. Steering gear; 26. Power battery; 27. Generator. Detailed Implementation

[0027] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0028] Please refer to the following: Figures 2 to 5 The hybrid hydraulic system of this embodiment includes a pump motor 1, a packing mechanism driven by the pump motor 1, a feeding mechanism driven by the pump motor 1, a cotton-removing mechanism driven by the pump motor 1, an engine 5, a second variable pump 6, a second fixed displacement pump 7, an auxiliary working mechanism 24, a steering gear 25, a controller assembly 20, and a power battery 26 for powering the pump motor 1. The feeding mechanism includes a first variable pump 3, a first reversing valve 9, a first flow control valve 10, a shuttle valve 11, and a feeder motor 22. The suction port of the first variable pump 3 is connected to the oil tank, and the outlet port of the first variable pump 3 is connected to the first inlet port P1 of the first reversing valve 9. The first outlet port T1 of the first reversing valve 9 is connected to the inlet port A1 of the feeder motor 22 through the first flow control valve 10. The outlet port B1 of the feeder motor 22 is connected to the oil tank. The second... The oil inlet P2 is connected to the auxiliary working mechanism 24. The second oil outlet T2 of the first directional valve 9 is connected to the oil tank. The first oil inlet P5 of the shuttle valve 11 is connected to the second oil inlet P2 of the first directional valve 9. The second oil inlet P6 of the shuttle valve 11 is connected to the oil inlet A1 of the feeder motor 22. The working port A3 of the shuttle valve 11 is connected to the load-sensitive oil port X of the first variable pump 3. The engine 5 drives the auxiliary working mechanism 24 through the second variable pump 6. The engine 5 drives the steering gear 25 through the second fixed displacement pump 7. The second variable pump 6 is connected to the auxiliary working mechanism 24 through the second check valve 17. The auxiliary working mechanism 24 is connected to the second oil inlet P2 of the first directional valve 9 through the first check valve 16. The flow of the second check valve 17 is opposite to that of the first check valve 16. The controller assembly 20 is connected to the first directional valve 9 and the first flow control valve 10 respectively.

[0029] In this embodiment of the hybrid hydraulic system, during the packing preparation stage, the pump set motor 1 drives the packing pump 2, the first variable pump 3, and the first fixed displacement pump 4 in a low-speed standby state to reduce energy consumption. The corresponding motors are not activated. The pressure oil at the outlet of the first variable pump 3 is cut off via the first directional valve 9 to the first flow control valve 10. Simultaneously, the first inlet P5 and the second inlet P6 of the shuttle valve 11 are connected to the oil tank, resulting in no pressure. This also causes the load-sensitive pressure port X of the first variable pump 3 to be pressureless. At this time, the first variable pump 3 is in a low-pressure standby state, and the output flow maintains the leakage requirements of the first variable pump 3. During the packing stage, the packing pump set motor 1 is increased to its rated operating speed, and the feeder motor 22 and the cotton-beating roller motor 23 operate simultaneously. At this time, the pressure oil at the outlet of the first variable pump 3 is cut off via the first directional valve 9 and the first flow control valve 10. The pressure from the feeder motor 22 is automatically selected by the first inlet P5 and the second inlet P6 of the shuttle valve 11 to the load-sensitive port X of the first variable pump 3. When the load increases, the first variable pump 3 will automatically increase the output pressure to meet the load requirements; when the load decreases, the first variable pump 3 will automatically reduce the output pressure to save energy. The first variable pump 3 provides load pressure feedback through the shuttle valve 11, senses the pressure and flow requirements of the system, and provides the required pressure and flow. It can maintain a suitable working pressure under different loads, improve the working efficiency and stability of the hydraulic system, and achieve energy saving. The oil flow direction is switched through the first reversing valve 9 to realize the switching between the feeder system and the auxiliary pump system. Maintenance can be completed when the engine 5 is turned off, and noise during maintenance can be reduced.

[0030] In this embodiment, the cotton-beating mechanism includes a first metering pump 4, a second reversing valve 13, a second flow control valve 15, a pressure compensation valve 14, and a cotton-beating roller motor 23. The oil inlet of the first metering pump 4 is connected to an oil tank, and the oil outlet of the first metering pump 4 is connected to the first oil inlet P3 of the second reversing valve 13. The first oil outlet T3 of the second reversing valve 13 is connected to the oil inlet A2 of the cotton-beating roller motor 23 through the second flow control valve 15. The oil outlet B2 of the cotton-beating roller motor 23 is connected to an oil tank. The second oil inlet P4 of the second reversing valve 13 is connected to a steering gear 25, and the second oil outlet T4 of the second reversing valve 13 is connected to the oil outlet B2 of the cotton-beating roller motor 23. The pressure compensation valve 14 is connected to the oil tank. The oil inlet P7 of the pressure compensation valve 14 is connected to the oil inlet P8 of the second flow control valve 15. The oil outlet T7 of the pressure compensation valve 14 is connected to the oil tank. The regulating chamber C7 of the pressure compensation valve 14 is connected to the oil outlet T8 of the second flow control valve 15. The second quantitative pump 7 is connected to the steering gear 25 through the fourth check valve 19. The steering gear 25 is connected to the second oil inlet P4 of the second reversing valve 13 through the third check valve 18. The flow of the fourth check valve 19 and the third check valve 18 is opposite. The controller assembly 20 is connected to the second reversing valve 13 and the second flow control valve 15 respectively. During the packing preparation stage, the pressurized oil from the outlet of the first metering pump 4 is cut off via the second directional valve 13 to the second flow control valve 15. The pressure before and after the second flow control valve 15 acts on the pressure compensation valve 14. At this time, since there is no pressure at the outlet of the second flow control valve 15, the regulating mechanism in the regulating chamber C7 will reduce the force on the valve core, causing the valve core to move in the opening direction, increasing the valve opening size. The system pressure is only related to its spring, and the system output pressure is low, in a low-pressure standby state. During the packing stage, the pressurized oil from the outlet of the first metering pump 4 is cut off via the second directional valve 13 and the second flow control valve 15 to the cotton-beating roller motor 23. The pressure at the outlet of the second flow control valve 15, the combined force of the spring of the pressure compensation valve 14, and the pressure of the second flow control valve 15 are all related to the pressure of the second flow control valve 15. Under the combined action of the preceding pressure, the regulating mechanism moves and eventually reaches equilibrium. At this point, the first metering pump 4 operates at a lower pressure, and the excess flow is unloaded through the pressure compensation valve 14, reducing heat generation. The first metering pump 4 is connected to the second flow control valve 15 and the pressure compensation valve 14. The load pressure and the pressure before the valve work together to regulate the pressure compensation valve 14, which can improve the phenomenon of large pressure loss after throttling and achieve energy saving. The second reversing valve 13 is used to switch the oil flow direction to realize the switching control between the cotton-beating roller system and the steering system. It can ensure the normal operation of the steering gear 25 when the engine 5 is turned off. In conjunction with the first reversing valve 9 to switch the oil circuit, it can realize the low-noise walking and transfer of the cotton harvester, thereby meeting specific environmental noise requirements and avoiding disturbance to residents. Optionally, the regulating mechanism is a spring or a hydraulic piston, which adjusts the position of the valve core according to the change of system pressure.

[0031] In this embodiment, the packaging mechanism includes a packaging pump 2 and a packaging motor 21 driven by the packaging pump 2.

[0032] In this embodiment, a generator 27 is also included. The engine 5 is connected to the power battery 26 through the generator 27, which can recover the kinetic energy of the engine 5 and charge the power battery 26, thereby further reducing energy consumption.

[0033] In this embodiment, a first overflow valve 8 is connected between the first oil inlet of the first reversing valve 9 and the second oil outlet of the first reversing valve 9 to ensure the safe pressure of the feeder working system; a second overflow valve 12 is connected between the first oil inlet of the second reversing valve 13 and the second oil outlet of the second reversing valve 13 to ensure the safe pressure of the cotton-beating roller working system.

[0034] A cotton harvester includes the aforementioned hybrid hydraulic system; it employs a load-sensitive variable pump and flow regulating valve, a fixed displacement pump combined with a pressure compensation valve and flow regulating valve to achieve system energy saving; it features a pure electric mode, which avoids frequent start-stop or continuous operation of the engine 5 under specific working conditions, resulting in low energy consumption, good energy-saving effect, and significantly reduced operating noise, offering advantages such as quiet operation and high comfort. In environments where charging is convenient, it reduces operating costs and avoids environmental impact; in the hybrid mode, the pump group motor 1 drives the baling pump group to be in low-speed standby mode, only operating at high speed when baling is required. Especially in the transfer mode, the baling pump group stops running, and the engine 5 operates at the optimal speed output state according to control requirements, resulting in good energy-saving effect.

[0035] A control method for a cotton harvester, applicable to the aforementioned cotton harvester, includes a composite mode, a transfer mode, and a pure electric mode.

[0036] In this embodiment, the composite mode is driven by the engine 5 to drive the second variable pump 6 and the second fixed pump 7. The outlet pressure oil of the second variable pump 6 goes through the second check valve 17 to the auxiliary working mechanism 24, driving the operation of each cylinder and corresponding motor of the auxiliary working mechanism 24. The outlet pressure oil of the second fixed pump 7 goes through the fourth check valve 19 to the steering gear 25.

[0037] During the packing preparation stage, the pump set motor 1 drives the packing pump 2, the first variable pump 3, and the first fixed displacement pump 4 in a low-speed standby state to reduce energy consumption. The corresponding motors of the packing pump set do not operate. The pressure oil at the outlet of the first variable pump 3 is cut off by the first directional valve 9 to the first flow control valve 10. At the same time, the first inlet P5 and the second inlet P6 of the shuttle valve 11 are connected to the oil tank and have no pressure. This results in no pressure at the load-sensitive pressure port X of the first variable pump 3. At this time, the first variable pump 3 is in a low-pressure standby state, and the output flow maintains the leakage requirements of the first variable pump 3. The pressure oil at the outlet of the first fixed displacement pump 4 is cut off by the second directional valve 13 to the second flow control valve 15. The pressure before and after the second flow control valve 15 acts on the pressure compensation valve 14. Since there is no pressure at the outlet of the second flow control valve 15, the system output pressure is low and it is in a low-pressure standby state.

[0038] During the packing stage, the pump motor 1 is increased to its rated operating speed, and the packing pump 2 drives the packing motor 21, the feeder motor 22, and the cotton-beating roller motor 23 to operate simultaneously. At this time, the pressure oil from the outlet of the first variable pump 3 is delivered to the feeder motor 22 via the first directional valve 9 and the first flow control valve 10. Simultaneously, the pressure at the load end of the feeder motor 22 is automatically selected by the pressure of the first inlet P5 and the second inlet P6 of the shuttle valve 11 to the load-sensitive oil port of the first variable pump 3. When the load increases, the first variable pump 3 will automatically increase the output pressure to meet the load requirements. When the load decreases, the first variable pump 3 will automatically reduce the output pressure to save energy. This load-sensitive adjustment method can maintain a suitable working pressure under different loads, improving the working efficiency and stability of the hydraulic system. The pressurized oil from the outlet of the first metering pump 4 passes through the second reversing valve 13 and the second flow control valve 15 to the cotton roller motor 23. The pressure at the outlet T8 of the second flow control valve 15, the combined force of the spring of the pressure compensation valve 14, and the pressure before the second flow control valve 15 work together to form a balance. For the execution system with a lower load, the first metering pump 4 also operates at a lower pressure at this time, and the excess flow is unloaded through the pressure compensation valve 14 to reduce heat generation.

[0039] In a traditional fuel system, all pumps operate simultaneously when the engine is running. In this embodiment, the relocation mode is used for equipment relocation operations. In this mode, only engine 5 starts running, while the packing pump motor 1 does not operate, thus reducing energy loss.

[0040] In this embodiment, the pure electric mode is used for specific environmental noise requirements or maintenance and relocation. The engine 5 is in the off state, and the second variable pump 6 and the second fixed displacement pump 7 are not working. The pump group motor 1 relies entirely on the power battery 26 for power. The controller assembly 20 outputs a signal to control the first reversing valve 9 and the second reversing valve 13 to switch the oil flow direction. The pressure oil at the outlet of the first variable pump 3 goes through the first reversing valve 9 and the first check valve 16 to the auxiliary working mechanism 24. The pressure oil at the outlet of the first fixed displacement pump 4 goes through the second reversing valve 13 and the third check valve 18 to the steering gear 25.

[0041] The control method of the cotton harvester of the present invention uses a pump group motor 1 to drive a baling pump group and an engine 5 to drive an auxiliary pump group, realizing multiple working modes such as compound mode, transfer mode, and pure electric mode; a first reversing valve 9 is used to switch the oil flow direction to realize the switching between the feeder system and the auxiliary pump system; a second reversing valve 13 is used to switch the oil flow direction to realize the switching control between the cotton-beating roller system and the steering system; through the pressure feedback of the first variable pump 3, the first flow control valve 10 and the shuttle valve 11, low-pressure standby is realized, which can maintain a stable flow output under different pressure conditions; using a first quantitative pump 4, a second flow control valve 15 and its pressure compensation valve 14, the system automatically changes with the load, saving energy while ensuring the stability and reliability of the hydraulic system operation.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A hybrid hydraulic system, characterized in that, The system includes a pump motor (1), a packing mechanism driven by the pump motor (1), a feeding mechanism driven by the pump motor (1), a cotton-removing mechanism driven by the pump motor (1), an engine (5), a second variable pump (6), a second quantitative pump (7), an auxiliary working mechanism (24), a steering gear (25), a controller assembly (20), and a power battery (26) for powering the pump motor (1). The feeding mechanism includes a first variable pump (3), a first reversing valve (9), and a first flow rate... The system includes a control valve (10), a shuttle valve (11), and a feeder motor (22). The suction port of the first variable pump (3) is connected to the oil tank, and the outlet port of the first variable pump (3) is connected to the first inlet port of the first directional valve (9). The first outlet port of the first directional valve (9) is connected to the inlet port of the feeder motor (22) through the first flow control valve (10). The outlet port of the feeder motor (22) is connected to the oil tank, and the second inlet port of the first directional valve (9) is connected to the auxiliary working mechanism. (24) Connection, the second oil outlet of the first reversing valve (9) is connected to the oil tank, the first oil inlet of the shuttle valve (11) is connected to the second oil inlet of the first reversing valve (9), the second oil inlet of the shuttle valve (11) is connected to the oil inlet of the feeder motor (22), the working port of the shuttle valve (11) is connected to the load-sensitive oil port of the first variable pump (3), the engine (5) drives the auxiliary working mechanism (24) through the second variable pump (6), the engine (5) through The steering gear (25) is driven by the second fixed displacement pump (7). The second variable displacement pump (6) is connected to the auxiliary working mechanism (24) through the second check valve (17). The auxiliary working mechanism (24) is connected to the second inlet of the first reversing valve (9) through the first check valve (16). The flow of the second check valve (17) is opposite to that of the first check valve (16). The controller assembly (20) is connected to the first reversing valve (9) and the first flow control valve (10) respectively. The cotton-beating mechanism includes a first metering pump (4), a second reversing valve (13), a second flow control valve (15), a pressure compensation valve (14), and a cotton-beating roller motor (23). The oil inlet of the first metering pump (4) is connected to the oil tank, and the oil outlet of the first metering pump (4) is connected to the first oil inlet of the second reversing valve (13). The first oil outlet of the second reversing valve (13) is connected to the oil inlet of the cotton-beating roller motor (23) through the second flow control valve (15). The oil outlet of the cotton-beating roller motor (23) is connected to the oil tank. The second oil inlet of the second reversing valve (13) is connected to the steering gear (25), and the second oil outlet of the second reversing valve (13) is connected to the oil tank. The inlet of the pressure compensation valve (14) is connected to the inlet of the second flow control valve (15), the outlet of the pressure compensation valve (14) is connected to the oil tank, the regulating chamber of the pressure compensation valve (14) is connected to the outlet of the second flow control valve (15), the second quantitative pump (7) is connected to the steering gear (25) through the fourth check valve (19), the steering gear (25) is connected to the second inlet of the second reversing valve (13) through the third check valve (18), the flow of the fourth check valve (19) and the third check valve (18) are opposite, and the controller assembly (20) is connected to the second reversing valve (13) and the second flow control valve (15) respectively.

2. The hybrid hydraulic system according to claim 1, characterized in that, The packaging mechanism includes a packaging pump (2) and a packaging motor (21) driven by the packaging pump (2).

3. The hybrid hydraulic system according to claim 2, characterized in that, It also includes a generator (27), through which the engine (5) is connected to the power battery (26).

4. The hybrid hydraulic system according to claim 3, characterized in that, A first relief valve (8) is connected between the first oil inlet of the first reversing valve (9) and the second oil outlet of the first reversing valve (9), and a second relief valve (12) is connected between the first oil inlet of the second reversing valve (13) and the second oil outlet of the second reversing valve (13).

5. A cotton harvester, characterized in that, Includes the hybrid hydraulic system as described in claim 4.

6. A control method for a cotton harvester, characterized in that, The cotton harvester described in claim 5 includes a composite mode, a transfer mode, and a pure electric mode.

7. The control method for a cotton harvester according to claim 6, characterized in that, The composite mode is driven by the engine (5) to drive the second variable pump (6) and the second fixed pump (7). The outlet pressure oil of the second variable pump (6) goes through the second check valve (17) to the auxiliary working mechanism (24), driving the action of each cylinder and corresponding motor of the auxiliary working mechanism (24). The outlet pressure oil of the second fixed pump (7) goes through the fourth check valve (19) to the steering gear (25). During the packing preparation stage, the pump set motor (1) drives the packing pump (2), the first variable pump (3) and the first fixed pump (4) to be in a low-speed standby condition. The pressure oil at the outlet of the first variable pump (3) is cut off to the first flow control valve (10) through the first reversing valve (9). At the same time, the first and second inlets of the shuttle valve (11) are connected to the oil tank and there is no pressure. This makes the load-sensitive pressure oil port of the first variable pump (3) also have no pressure. At this time, the first variable pump (3) is in a low-pressure standby state and the output flow maintains the leakage requirement of the first variable pump (3). The pressure oil at the outlet of the first fixed pump (4) is cut off to the second flow control valve (15) through the second reversing valve (13). The pressure before and after the second flow control valve (15) acts on the pressure compensation valve (14). Since there is no pressure at the outlet of the second flow control valve (15), the system output pressure is low and it is in a low-pressure standby state. During the packing stage, the pump motor (1) is increased to its rated operating speed, and the packing pump (2) drives the packing motor (21), the feeder motor (22), and the cotton-beating roller motor (23) to operate simultaneously. At this time, the pressure oil from the outlet of the first variable pump (3) passes through the first reversing valve (9) and the first flow control valve (10) to the feeder motor (22). Simultaneously, the pressure at the load end of the feeder motor (22) is automatically selected by the first and second inlets of the shuttle valve (11) to reach the load-sensitive oil port of the first variable pump (3). When the load increases, the first variable pump (3) automatically increases its output pressure to achieve the desired pressure. To meet the load requirements, when the load decreases, the first variable pump (3) will automatically reduce the output pressure to save energy. The pressure oil at the outlet of the first fixed pump (4) passes through the second reversing valve (13) and the second flow control valve (15) to the cotton roller motor (23). The pressure at the outlet of the second flow control valve (15) and the combined force of the spring of the pressure compensation valve (14) and the pressure before the valve of the second flow control valve (15) form a balance. For the execution system with a lower load, the first fixed pump (4) also works at a lower pressure. The excess flow is unloaded through the pressure compensation valve (14) to reduce heat generation.

8. The control method for a cotton harvester according to claim 6, characterized in that, The transfer mode is used for equipment transfer operations. In this mode, only the engine (5) starts running, and the pump motor (1) does not run.

9. The control method for a cotton harvester according to claim 6, characterized in that, The pure electric mode is used for specific environmental noise requirements or maintenance and relocation. The engine (5) is in the off state, the second variable pump (6) and the second fixed pump (7) are not working, the pump group motor (1) relies entirely on the power battery (26) to provide power, the controller assembly (20) outputs a signal to control the first reversing valve (9) and the second reversing valve (13) to switch the oil flow direction, the pressure oil at the outlet of the first variable pump (3) goes through the first reversing valve (9) and the first check valve (16) to the auxiliary working mechanism (24), and the pressure oil at the outlet of the first fixed pump (4) goes through the second reversing valve (13) and the third check valve (18) to the steering gear (25).

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