Electric control lifting hydraulic system for tractor

Abstract

The utility model relates to an electric control lifting hydraulic system for a tractor, which comprises an oil tank, a gear pump, an electric control lifting valve, a lifting oil cylinder and a multi-way valve, the electric control lifting valve and the multi-way valve are arranged on a lifter of the tractor, and the electric control lifting valve comprises three switch type electromagnetic valves, three control valve cores and a one-way valve. The functions of lifting, neutral position, descending, floating and the like of a lifting system of the tractor can be conveniently achieved, and force and position feedback adjustment can be achieved in cooperation with an electric control element. Three groups of hydraulic output requirements of the tractor can be met; meanwhile, the multi-way valve is simple in arrangement and comfortable, light and convenient to operate, the functions of a traditional mechanical multi-way valve are achieved with low cost in combination with the market of domestic agricultural machinery, and the requirements of users can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of electronically controlled lifting hydraulic systems, and particularly relates to an electronically controlled lifting hydraulic system for a tractor. Background Art

[0002] I. Currently, the lifting systems of tractors generally use hydraulic drive to lift and lower agricultural implements. The traditional hydraulic lifting system basically uses a mechanical mechanism for feedback and control. This structure meets the operation requirements to a certain extent, but the structure with force and position adjustment is generally concentrated with the lift, which is relatively complex and difficult to maintain later.

[0003] II. As the land plots become larger and larger and the tractor drivers are getting younger, it is necessary for the tractor hydraulic lifting system to be precise, easy to operate comfortably and more intelligent. Therefore, the electronically controlled lifting hydraulic system came into being. By relying on advanced sensor and hydraulic control technologies, it makes it easy for the driver to operate and improves the operation effect at the same time. Summary of the Utility Model

[0004] To solve the above problems, this patent provides an electronically controlled lifting hydraulic system for a tractor. This hydraulic system can realize the lifting, lowering and floating functions of agricultural implements, and has a force and position feedback function. At the same time, it can provide three groups of hydraulic outputs for connecting other auxiliary tools.

[0005] The technical solution adopted by this patent to solve the above technical problems is: The utility model discloses an electronically controlled lifting hydraulic system for a tractor, which includes an oil tank, an oil suction filter, a hydraulic output multi-way valve, an electronically controlled lifting distributor, a lifting cylinder and a slow-down valve. The utility model replaces the traditional mechanical built-in lifter, and with the cooperation of an electrical control module, the layout of the circuit components is simple, and it can realize electronically controlled lifting, lowering, floating and force-position tillage depth adjustment.

[0006] To achieve the above object, an electronically controlled lifting hydraulic system for a tractor is provided, which includes a hydraulic oil tank. An oil suction filter is connected to the side of the hydraulic oil tank, and a gear pump is connected above the oil suction filter;

[0007] A safety valve is arranged above the gear pump, a multi-way valve is arranged above the safety valve, and a hydraulic output valve is connected to the left side of the multi-way valve.

[0008] According to the described electronically controlled lifting hydraulic system for a tractor, an electronically controlled distributor is arranged on the right side of the hydraulic output valve, and a return oil valve is connected above the electronically controlled distributor.

[0009] According to the described electronically controlled lifting hydraulic system for a tractor, a lifting protection valve is connected to the right side of the return oil valve, and a lowering valve is arranged on the side of the lifting protection valve.

[0010] According to the electro-hydraulic lift system for a tractor described above, a lift valve is arranged below the lowering valve. The lift valve is connected to a check valve, and the check valve is connected to a pressure valve.

[0011] According to the electro-hydraulic lift system for a tractor described above, a switching valve is arranged on the side of the lift valve. The switching valve is connected to a switching control valve.

[0012] According to the electro-hydraulic lift system for a tractor described above, a lowering protection valve is arranged on one side of the switching valve away from the lift valve.

[0013] According to the electro-hydraulic lift system for a tractor described above, a lift cylinder is arranged below the multi-way valve. A slow-down valve is connected above the lift cylinder.

[0014] The utility model has the following beneficial effects:

[0015] This technology relates to the technical field of tractor manufacturing, specifically an electro-hydraulic lift system for a tractor. The electronic control unit realizes the position control and resistance adjustment of agricultural implements by controlling the solenoid valve and the force-position feedback element in the electro-hydraulic lift valve, and realizes the control of the tillage depth and traction force of the tractor; the multi-way valve of this system also has three groups of hydraulic outputs for users to use, realizing multi-functional use of one machine and meeting more usage possibilities of customers.

[0016] The additional aspects and advantages of the utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following further illustrates the utility model with reference to the drawings and embodiments;

[0018] Figure 1 It is the schematic diagram of an electro-hydraulic lift system for a tractor of the utility model;

[0019] Figure 2 It is the connection diagram of an electro-hydraulic lift system for a tractor of the utility model.

[0020] LEGEND DESCRIPTION:

[0021] 1. Hydraulic oil tank; 2. Suction filter; 3. Gear pump; 4. Safety valve; 5. Multi-way valve; 6. Hydraulic output valve; 7. Electronic control distributor; 8. Return oil valve; 9. Lift valve; 10. Check valve; 11. Lowering valve; 12. Lift protection valve; 13. Pressure valve; 14. Lowering protection valve; 15. Switching valve; 16. Switching control valve; 17. Lift cylinder; 18. Slow-down valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The function of the accompanying drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present utility model. However, it should not be construed as a limitation on the protection scope of the present utility model.

[0023] Referring to Figure 1-2 , an electro-hydraulic lift system for a tractor according to an embodiment of the present utility model includes a hydraulic oil tank 1. An oil suction filter 2 is connected to the side of the hydraulic oil tank 1, and a gear pump 3 is connected above the oil suction filter 2;

[0024] A safety valve 4 is arranged above the gear pump 3, a multi-way valve 5 is arranged above the safety valve 4, a hydraulic output valve 6 is connected to the left side of the multi-way valve 5, an electronic control distributor 7 is arranged on the right side of the hydraulic output valve 6, a return oil valve 8 is connected above the electronic control distributor 7, a lift protection valve 12 is connected to the right side of the return oil valve 8, a lowering valve 11 is arranged on the side of the lift protection valve 12, a lift valve 9 is arranged below the lowering valve 11, the lift valve 9 is connected to a check valve 10, the check valve 10 is connected to a pressure valve 13, a switching valve 15 is arranged on the side of the lift valve 9, the switching valve 15 is connected to a switching control valve 16, a lowering protection valve 14 is arranged on the side of the switching valve 15 away from the lift valve 9, a lift cylinder 17 is arranged below the multi-way valve 5, and a slow-down valve 18 is connected above the lift cylinder 17;

[0025] In the above structure, the hydraulic oil tank 1 is set to provide the oil source for the system, and the suction filter 2 effectively filters the hydraulic oil entering the system. The gear pump 3 provides power for the whole system. The safety valve 4 is built in the multi-way valve 5 to limit the maximum pressure of the whole system. The hydraulic output valve 6 is built in the multi-way valve 5. The multi-way valve 5 contains three groups of valve plates for users to externally connect auxiliary agricultural machinery. The oil return valve 8 is arranged inside the electric control distributor 7. When it is desired to lift the agricultural machinery, the knob is controlled electrically, so that the electromagnet of the lift valve 9 is energized and commutated, and the high-pressure oil flows into the cylinder chamber through the electric control distributor 7 to generate the lifting power. The check valve 10 acts as a check valve to lock the cylinder and prevent the cylinder piston rod from falling when there is no power or under heavy load. When the solenoid valve of the lowering valve 11 is energized, the rod chamber and the rodless chamber of the lift cylinder 17 are connected to the oil tank at the same time. At this time, the cylinder can descend by the self-weight of the agricultural machinery. When using agricultural machinery with ground wheels, floating contour following operation can also be carried out. When lifting operation is performed or when the piston rod end is under heavy load and impact, when the pressure exceeds the spring setting pressure of the lift protection valve 12, the oil will overflow to protect the lift system. The pressure valve 13 cuts off the oil return during lifting operation and cooperates with the oil return valve 8 for auxiliary oil return when lifting is not working. The lowering protection valve 14 will overflow to protect when the driving pressure exceeds the setting pressure of the safety valve 4 during lowering. The strong lowering function switching valve 15 is controlled by the switching control valve 16 and the solenoid valve of the lowering valve 11. When the switching control valve 16 and the solenoid valve of the lowering valve 11 are energized at the same time, the strong lowering switching valve 15 is commutated, and the high-pressure oil enters the rod chamber through the electric control distributor 7 to drive the agricultural machinery to lower forcibly, and the oil in the rodless chamber returns oil through the lowering valve 11. When the agricultural machinery descends by its own weight or when a negative pressure is generated in the rodless chamber during forced lowering, it can play a role in slow descent or buffering. When none of the above solenoid valves is energized, the cylinder stops at any position and remains stationary. With the above cooperation with the position sensor and the tension sensor, force-position feedback regulation can be generated to realize the control of tillage depth regulation and traction force regulation operations.

[0026] Working principle: When it is desired to lift the agricultural implement, the knob is controlled electrically, thereby causing the electromagnet of the lift valve 9 to be energized and commutated. High-pressure oil flows into the cylinder cavity through the electronic control distributor 7 to generate lifting power. The check valve 10 acts as a check valve to lock the cylinder and prevent the cylinder piston rod from falling when there is no power or under heavy load. When the electromagnet of the lowering valve 11 is energized, the rod chamber and the rodless chamber of the lift cylinder 17 are simultaneously connected to the fuel tank. At this time, the cylinder can descend by the self-weight of the agricultural implement. When using an agricultural implement with ground wheels, floating contour following operation can also be performed. When lifting operation is carried out or when the piston rod end is under heavy load or impact, the pressure exceeds the spring setting pressure of the lift protection valve 12, and the oil will overflow to protect the lift system. The pressure valve 13 cuts off the oil return during lifting operation and cooperates with the oil return valve 8 for auxiliary oil return when lifting is not working. The lowering protection valve 14 will overflow to protect when the driving pressure exceeds the setting pressure of the safety valve 4 during lowering. The forced lowering function switching valve 15 is controlled by the switching control valve 16 and the solenoid valve of the lowering valve 11. When the switching control valve 16 and the solenoid valve of the lowering valve 11 are simultaneously energized, the forced lowering switching valve 15 commutates, and high-pressure oil enters the rod chamber through the electronic control distributor 7 to drive the agricultural implement to lower forcibly, and the oil in the rodless chamber returns oil through the lowering valve 11. When the agricultural implement descends by its own weight or when a negative pressure is generated in the rodless chamber during forced lowering, a slow descent or buffering effect can be achieved. When none of the above solenoid valves are energized, the cylinder stops at any position and remains stationary. With the above cooperation with the position sensor and the tension sensor, force-position feedback regulation can be generated to realize the control of tillage depth regulation and traction force regulation operations.

[0027] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. An electronically controlled lifting hydraulic system for a tractor, characterized in that, It includes a hydraulic oil tank (1), with an oil suction filter (2) connected to the side of the hydraulic oil tank (1), and a gear pump (3) connected above the oil suction filter (2). Above the gear pump (3), a safety valve (4) is provided. Above the safety valve (4), a multi-way valve (5) is provided. On the left side of the multi-way valve (5), a hydraulic output valve (6) is connected.

2. The electro-hydraulic lift system for a tractor according to claim 1, wherein, On the right side of the hydraulic output valve (6), an electric control distributor (7) is provided. Above the electric control distributor (7), an oil return valve (8) is connected.

3. The electro-hydraulic lifting system for a tractor according to claim 2, characterized in that, On the right side of the oil return valve (8), a lifting protection valve (12) is connected. On the side of the lifting protection valve (12), a lowering valve (11) is provided.

4. An electro-hydraulic lift system for a tractor according to claim 3, characterized in that, Below the lowering valve (11), a lifting valve (9) is provided. The lifting valve (9) is connected to a check valve (10), and the check valve (10) is connected to a pressure valve (13).

5. The electro-hydraulic lifting system for a tractor according to claim 4, characterized in that, On the side of the lifting valve (9), a switching valve (15) is provided. The switching valve (15) is connected to a switching control valve (16).

6. The electro-hydraulic lift system for a tractor according to claim 5, characterized in that, On the side of the switching valve (15) away from the lifting valve (9), a lowering protection valve (14) is provided.

7. An electro-hydraulic lifting system for a tractor according to claim 1, characterized in that, Below the multi-way valve (5), a lifting cylinder (17) is provided. Above the lifting cylinder (17), a slow-down valve (18) is connected.

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