Electric control lifting and hydraulic output hydraulic system of tractor

Abstract

The invention discloses a tractor electric control lifting and hydraulic output hydraulic system which is provided with a hydraulic output valve group used for hydraulic control, and a lifting valve group is arranged on the left side of the hydraulic output valve group. Comprising a first overflow valve installed on the left side of the outer surface of the hydraulic output valve set, a first three-position four-way electromagnetic valve is installed on the left side of the outer surface of the first overflow valve, and the first overflow valve is used for pressure control; the second overflow valve is installed on the lower surface of the lifting valve set, and the right side of the outer surface of the second overflow valve is connected with a first two-position two-way electromagnetic valve. According to the electric control lifting and hydraulic output hydraulic system of the tractor, suspension lifting and hydraulic output of the tractor and full electric control operation of a machine tool hydraulic power source are achieved, compared with mechanical operation, labor intensity is relieved, further, in addition, the electric control lifting system is a switch valve system, and compared with a proportional valve system, the fault rate is low; and the requirement for the cleanliness of oil is relatively low, and troubleshooting and maintenance are convenient.

Description

Technical Field

[0001] The invention relates to the technical field of electric-controlled lifting and hydraulic output of tractors, and in particular to an electric-controlled lifting and hydraulic output hydraulic system for tractors. Background Art

[0002] The tractor's electronic lifting and hydraulic output hydraulic control is mainly used to control the lifting and lowering actions of the tractor's supporting mechanical devices, and to accurately control the height of the agricultural implement machinery to adapt to different agricultural operation requirements, maintain the appropriate tillage depth during the tillage process, and the lifting height of the agricultural implement during transportation.

[0003] During use, it is inconvenient to effectively and stably control the agricultural implements used for farming, which may easily cause shaking or falling; In order to overcome the above-mentioned defects, the prior art (application number is CN202222461845.3, and the application date is 2022-09-17 Chinese patent) is a tractor hydraulic lifting and hydraulic output system, which is provided with an angle sensor and a force sensor, that is, after the electric control lifting valve assembly is energized, the angle sensor and the force sensor can cooperate to realize that the proportional rising valve and the proportional falling valve inside the electric control lifting valve assembly adapt to the hydraulic oil flow, and the internal valve core opening is stably adjusted to realize the increase of the cultivated land depth, and when the cultivated land force value is exceeded, the proportional falling valve can be driven to operate to reduce the cultivated land depth, and the multi-way valve assembly arranged in the middle of the upper end pipeline of the gear pump can control and adjust the hydraulic oil flow, reversing adjustment and quick cut-off throttling activities, thereby achieving the advantages of semi-closed loop control of the height of the lifting cylinder, and accurately controlling the lifting height to achieve a suitable cultivated land effect; There is also a prior art (Chinese patent with application number CN202123105018.2 and application date 2021-12-12) of an electric tractor hydraulic system, which provides an electric tractor hydraulic system through improvement, and compared with the same type of equipment, has the following improvements; this electric tractor hydraulic system structure is specially developed for electric tractors, realizing the electrification of tractors, and electric tractors have significant advantages such as energy saving and environmental protection. This electric tractor hydraulic system structure adopts a hydraulic diverter valve, realizing that one power of the electric tractor hydraulic system drives multiple hydraulic subsystems to work, and this electric tractor hydraulic system structure adopts an oil pressure sensor, realizing the load sensitivity of the wave pressure system and the automatic adjustment of the motor speed, which achieves the purpose of saving electricity and controlling the temperature rise of the motor in the electric tractor; And the prior art (Chinese patent with application number CN202222461853.8 and application date 2022-09-17) a tractor hydraulic control system, which controls the oil pressure by setting a logic valve on the pipeline in the hydraulic system, so that the oil pressure is 24Pa±1Pa, and the oil can control the rear differential lock clutch and the front differential lock clutch through the electromagnetic reversing valve, and the oil can enter the rear PTO clutch through the PTO electromagnetic reversing valve, so as to control the rear PTO clutch, and lubricate and cool the gears and shafts of the hydraulic clutch respectively through the gear lubrication pipeline and the PTO lubrication pipeline, thereby improving the overall integration of the hydraulic system, and the setting of the gearbox cooler can cool the oil flowing through it to facilitate the subsequent cooling and lubrication of the gears and shafts, thereby reducing the influence of oil temperature, and the overall spatial layout of the hydraulic system is reasonable, which is convenient for maintenance and maintenance; Although the existing technology can form effective hydraulic control, it is difficult to control the stability of the lifting and lowering of the agricultural implement during operation, which easily causes large position deviations when the agricultural implement is lifted and lowered, and is difficult to eliminate when a fault occurs; In view of the above problems, it is urgent to carry out innovative design based on the original tractor electronically controlled lifting and hydraulic output hydraulic system. Summary of the invention

[0004] The object of the present invention is to provide a tractor electronically controlled lifting and hydraulic output hydraulic system to solve the problem in the above background technology that the stability of controlling the lifting and lowering of agricultural implements during operation easily causes large position deviations when the agricultural implements are lifted and lowered, and it is difficult to eliminate the problems when a fault occurs.

[0005] To achieve the above object, the present invention provides the following technical solutions: a tractor electronically controlled lifting and hydraulic output hydraulic system, provided with a hydraulic output valve group for hydraulic control, and a lifting valve group is provided on the left side of the hydraulic output valve group; It includes: a relief valve 1, which is installed on the left side of the outer surface of the hydraulic output valve group, and a three-position four-way solenoid valve 1 is installed on the left side of the outer surface of the relief valve 1, and the relief valve 1 is used for pressure control; Overflow valve 2 is installed on the lower surface of the lifting valve group, and a two-position two-way solenoid valve 1 is connected to the right side of the outer surface of overflow valve 2. Overflow valve 2 is used to control the lifting, lowering, middle position or floating use of the tractor.

[0006] Preferably, the overflow valve 1 forms a current limiting connection with the three-position four-way solenoid valve 1, and the left side of the outer surface of the three-position four-way solenoid valve 1 is connected to the three-position four-way solenoid valve 2 through a pipeline, and the left side of the outer surface of the three-position four-way solenoid valve 2 is connected to the three-position four-way solenoid valve 3 through a pipeline.

[0007] Through the above structure, the pressure of the entire hydraulic system is effectively limited by the overflow valve 1 during use to ensure the normal operation of the system, and the size of the pressure of the overflow valve 1 determines the ability of each hydraulic actuator to drive the load.

[0008] Preferably, the left side of the outer surface of the three-position four-way solenoid valve three is connected to the three-position four-way solenoid valve four through a pipeline, and the left side of the outer surface of the three-position four-way solenoid valve four is connected to the two-position two-way solenoid valve one through a pipeline.

[0009] Through the above structure, when in use, the three-position four-way solenoid valve one, the three-position four-way solenoid valve two, the three-position four-way solenoid valve three and the three-position four-way solenoid valve four are used as the hydraulic output electric control valve group to provide hydraulic power for the agricultural machinery carried by the tractor.

[0010] Preferably, the three-position four-way solenoid valve one, the three-position four-way solenoid valve two, the three-position four-way solenoid valve three and the three-position four-way solenoid valve four are assembled in sequence from right to left, and the three-position four-way solenoid valve one, the three-position four-way solenoid valve two, the three-position four-way solenoid valve three and the three-position four-way solenoid valve four form a parallel structure with the overflow valve one and the two-position two-way solenoid valve one, respectively.

[0011] Through the above structure, when the assembled two-position two-way solenoid valve is used, the switching determines whether the hydraulic output valve group and the tractor lifting valve group are working or not, and when the two-position two-way solenoid valve is in the left position, the tractor lifting valve group works, and when the two-position two-way solenoid valve is in the right position, the tractor hydraulic output valve group works.

[0012] Preferably, a three-position four-way solenoid valve five is connected to the upper side of the outer surface of the overflow valve two, and a two-position two-way solenoid valve two is installed on the left side of the upper surface of the three-position four-way solenoid valve five, and a two-position two-way solenoid valve three is installed on the right side of the upper surface of the three-position four-way solenoid valve five.

[0013] Through the above structure, the maximum lifting force of the tractor suspension mechanism is determined by the overflow valve 2 used during use.

[0014] Preferably, the three-position four-way solenoid valve five forms a parallel structure with the two-position two-way solenoid valve two and the two-position two-way solenoid valve three respectively.

[0015] Through the above structure, when in use, by switching the three-position four-way solenoid valve five, the tractor-mounted agricultural machinery can have the functions of rising, falling, neutral and floating, and cooperate with the two-position two-way solenoid valve two and the two-position two-way solenoid valve three to connect the upper chamber of the lifting cylinder to provide a pressure-maintaining function for the upper chamber of the lifting cylinder. Some large agricultural machinery requires that the upper chamber of the cylinder be pressurized during transportation, otherwise the cylinder of the machinery cannot be fully opened, affecting transportation.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The tractor's electronically controlled lifting and hydraulic output hydraulic system realizes the fully electronically controlled operation of the tractor's suspension lifting and hydraulic output as well as the hydraulic power source of the implement, which reduces the labor intensity compared to mechanical operation; Furthermore, the electric control lifting system is a switch valve system, which has a lower failure rate than the proportional valve system, has relatively lower requirements on the cleanliness of the oil, and is easy to troubleshoot and maintain; 2. The tractor's electronically controlled lifting and hydraulic output hydraulic system is provided with relief valve 1 and relief valve 2, which respectively control the pressure of the entire hydraulic system and the tractor's suspension mechanism; Furthermore, different solenoid valve bodies are arranged through the hydraulic output valve group and the lifting valve group, so as to effectively provide hydraulic power to the agricultural implements carried by the tractor; Further cooperate with the adjustment of the three-position two-way solenoid valve to control the tractor suspension mechanism to have movement positions such as rising, falling, neutral and floating. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the hydraulic output valve group and the lifting valve group of the present invention; Figure 2 The table is a working state table of the hydraulic system of the present invention and a sequence table of the electromagnet being energized; Figure 3 It is a schematic diagram of a mid-position unloading structure of the overflow valve of the present invention; Figure 4 It is a schematic diagram of a hydraulic output pressure-up structure of a three-position four-way solenoid valve of the present invention; Figure 5 This is a schematic diagram of the lifting structure of the lifting valve assembly tool of the present invention; Figure 6 It is a schematic diagram of the descending structure of the lifting valve assembly tool of the present invention; Figure 7 It is a schematic diagram of the floating structure of the lifting valve assembly tool of the present invention.

[0018] In the figure: 1. Hydraulic output valve group; 2. Lifting valve group; 3. Overflow valve one; 4. Three-position four-way solenoid valve one; 5. Three-position four-way solenoid valve two; 6. Three-position four-way solenoid valve three; 7. Three-position four-way solenoid valve four; 8. Two-position two-way solenoid valve one; 9. Overflow valve two; 10. Three-position four-way solenoid valve five; 11. Two-position two-way solenoid valve two; 12. Two-position two-way solenoid valve three. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figure 1-Figure 7 , the present invention provides a technical solution: a tractor electronically controlled lifting and hydraulic output hydraulic system, provided with a hydraulic output valve group 1 for hydraulic control, and a lifting valve group 2 is provided on the left side of the hydraulic output valve group 1; Embodiment 1: Figure 1 and Figure 2 The technical solution shown in the figure, the present invention provides the following technical solution: a tractor electronically controlled lifting and hydraulic output hydraulic system, disclosed: It includes: a relief valve 3, which is installed on the left side of the outer surface of the hydraulic output valve group 1, and a three-position four-way solenoid valve 4 is installed on the left side of the outer surface of the relief valve 3, and the relief valve 3 is used for pressure control; The overflow valve 2 9 is installed on the lower surface of the lifting valve group 2, and a two-position two-way solenoid valve 1 8 is connected to the right side of the outer surface of the overflow valve 2 9. The overflow valve 2 9 is used to control the lifting, lowering, middle position or floating use of the tractor.

[0021] When in use, the overflow valve 13 and the electromagnetic valve body assembled by the hydraulic output valve group 1, and the overflow valve 29 controlled by the lifting valve group 2, effectively control the hydraulic adjustment of the tractor implements, and control the use of agricultural implements, and in conjunction with the use of the overflow valve 13, it can be used to limit the pressure of the entire hydraulic system to ensure the normal operation of the system. The pressure of the overflow valve 13 determines the ability of each hydraulic actuator to drive the load, and in conjunction with the use of the overflow valve 29, it can determine the maximum lifting force of the tractor suspension mechanism; Embodiment 2: Figure 1-Figure 4 The technical solution shown, on the basis of the first embodiment, further discloses the neutral unloading and provision of hydraulic pressure when the hydraulic output valve group 1 is in use, and its specific contents are as follows: The overflow valve 1 3 and the three-position four-way solenoid valve 1 4 form a current limiting connection, and the left side of the outer surface of the three-position four-way solenoid valve 1 4 is connected to the three-position four-way solenoid valve 2 5 through a pipeline, and the left side of the outer surface of the three-position four-way solenoid valve 2 5 is connected to the three-position four-way solenoid valve 3 6 through a pipeline.

[0022] The left side of the outer surface of the three-position four-way solenoid valve three 6 is connected to the three-position four-way solenoid valve four 7 through a pipeline, and the left side of the outer surface of the three-position four-way solenoid valve four 7 is connected to the two-position two-way solenoid valve one 8 through a pipeline.

[0023] The three-position four-way solenoid valve 1 4, the three-position four-way solenoid valve 2 5, the three-position four-way solenoid valve 3 6 and the three-position four-way solenoid valve 4 7 are assembled in sequence from right to left, and the three-position four-way solenoid valve 1 4, the three-position four-way solenoid valve 2 5, the three-position four-way solenoid valve 3 6 and the three-position four-way solenoid valve 4 7 respectively form a parallel structure with the overflow valve 1 3 and the two-position two-way solenoid valve 1 8.

[0024] When the tractor's electronically controlled lifting and hydraulic output hydraulic system is required to unload in the middle position, all the electromagnets on the hydraulic output valve group 1 and the lifting valve group 2 will be de-energized, and the hydraulic oil will enter the valve group from the P port, and flow to the left side of the two-position two-way solenoid valve 1 8, and flow to the middle position of the three-position four-way solenoid valve 5 10, and flow to the oil tank, so that the hydraulic system is unloaded. At this time, the engine works without load, and the entire hydraulic actuator does not work; When the hydraulic output needs to be pressed to the upper side of the three-position four-way solenoid valve 4, the right electromagnet of the two-position two-way solenoid valve 8 is energized, and the upper electromagnet of the three-position four-way solenoid valve 25 is energized, so that the right side of the two-position two-way solenoid valve 8 has a one-way valve function. When the right electromagnet is energized, the middle oil unloading channel of the two-position two-way solenoid valve 8 is cut off, and the upper electromagnet of the three-position four-way solenoid valve 25 is energized, which can make the pipeline connected to the lower side of the three-position four-way solenoid valve 25 have pressure oil for use, and the pipeline connected to the upper side of the three-position four-way solenoid valve 25 has return oil for use, which can be used for machinery and implements. In this state, the tractor can carry large agricultural machinery and implements, and provide hydraulic power for the agricultural machinery and implements, and cooperate with the set three-position four-way solenoid valve 4, The three-position four-way solenoid valve 2 5, the three-position four-way solenoid valve 3 6 and the three-position four-way solenoid valve 4 7, a total of four groups of solenoid reversing valves, can drive four groups of actuators of agricultural machinery to work, and meet the use requirements of agricultural machinery to the maximum extent. The three-position four-way solenoid valve 1 4, the three-position four-way solenoid valve 2 5, the three-position four-way solenoid valve 3 6 and the three-position four-way solenoid valve 4 7 can be used as the hydraulic output electric control valve group when in use, and provide hydraulic power for the agricultural machinery carried by the tractor, and work through the two-position two-way solenoid valve 1 8, and can cooperate with its switching to determine whether the hydraulic output valve group 1 and the tractor lifting valve group 2 work or not. The two-position two-way solenoid valve 1 8 is in the left position, and the tractor lifting valve group 2 works. The two-position two-way solenoid valve 1 8 is in the right position to control the operation of the tractor hydraulic output valve group 1; Embodiment 3: Figure 1 , Figure 2 , Figure 5 , Figure 6 and Figure 7 The technical solution shown, on the basis of the second embodiment, also discloses the adjustment of the tractor suspension mechanism, the specific contents of which are as follows: A three-position four-way solenoid valve five 10 is connected to the upper side of the outer surface of the overflow valve two 9, and a two-position two-way solenoid valve two 11 is installed on the left side of the upper surface of the three-position four-way solenoid valve five 10, and a two-position two-way solenoid valve three 12 is installed on the right side of the upper surface of the three-position four-way solenoid valve five 10.

[0025] The three-position four-way solenoid valve five 10 forms a parallel structure with the two-position two-way solenoid valve two 11 and the two-position two-way solenoid valve three 12 respectively.

[0026] When the tractor suspension mechanism rises, the right electromagnet on the three-position four-way solenoid valve five 10 is energized, and the right-position pressure oil of the three-position four-way solenoid valve five 10 flows to the upper outlet through the two-position two-way solenoid valve two 11 and enters the lower chamber of the lifting cylinder, the cylinder piston rod extends, and the suspension mechanism rises. At the same time, the right electromagnet of the two-position two-way solenoid valve three 12 is energized, and flows through the right position of the two-position two-way solenoid valve three 12, and cooperates with the hydraulic oil in the upper chamber of the lifting cylinder, and flows back to the return oil tank through the upper port of the two-position two-way solenoid valve three 12. When the machine needs to be lifted during use, it works in this state. The hydraulic system can be equipped with an angle sensor, which is installed on the lifting arm of the tractor lifter. The angle signal of the angle sensor is transmitted to the controller, and the controller controls the power gain and loss of the three-position four-way solenoid valve five 10, thereby affecting the tillage depth of the machine. When the tractor suspension mechanism is lowered, the left electromagnet on the three-position four-way solenoid valve five 10 is energized, and the left-position pressure oil of the three-position four-way solenoid valve five 10 flows to the upper outlet through the two-position two-way solenoid valve three 12 and enters the lower chamber of the lifting cylinder, the cylinder piston rod retracts, and the suspension mechanism is lowered. At the same time, the left electromagnet of the two-position two-way solenoid valve three 12 is energized, and the hydraulic oil in the upper chamber of the lifting cylinder flows back to the return tank through the upper port of the two-position two-way solenoid valve two 11 through the left position of the two-position two-way solenoid valve three 12 and in coordination with the hydraulic oil in the upper chamber of the lifting cylinder. When the machine needs to be lowered during use, it works in this state; When the tractor suspension mechanism floats, the hydraulic oil enters the valve group from the P port, and flows to the two-position two-way solenoid valve one 8 through the parallel pipelines of the three-position four-way solenoid valve one 4, the three-position four-way solenoid valve two 5, the three-position four-way solenoid valve three 6, and the three-position four-way solenoid valve four 7. At this time, the electromagnets of the two-position two-way solenoid valve two 11 and the two-position two-way solenoid valve three 12 are energized to control the hydraulic oil in the upper side ports of the two-position two-way solenoid valve two 11 and the two-position two-way solenoid valve three 12, that is, the hydraulic oil in the upper and lower chambers of the cylinder, and at the same time flow to the return tank through the middle position of the three-position four-way solenoid valve five 10, from When the tractor is used with implements, the implements are equipped with ground wheels, and the tillage depth can be changed by adjusting the ground wheels. At this time, the upper and lower chambers of the lifting cylinder are connected to the oil tank at the same time, ensuring the up and down floating of the lifting cylinder piston rod, so that the implement can follow the contour of the ground wheels. In this way, the use of the two-position two-way solenoid valve 2 11, the two-position two-way solenoid valve 2 11 and the two-position two-way solenoid valve 3 12 can be used to effectively control the rise, fall, middle position or floating use of the tractor suspension mechanism, maintain pressure for the suspension mechanism, avoid excessive static settlement of the suspension mechanism, and effectively improve the use stability during transportation.

[0027] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tractor electronically controlled lifting and hydraulic output hydraulic system, comprising a hydraulic output valve group (1) for hydraulic control, and a lifting valve group (2) is arranged on the left side of the hydraulic output valve group (1); It is characterized in that include: A relief valve (3) is installed on the left side of the outer surface of the hydraulic output valve group (1), and a three-position four-way solenoid valve (4) is installed on the left side of the outer surface of the relief valve (3), and the relief valve (3) is used for pressure control; The overflow valve 2 (9) is installed on the lower surface of the lifting valve group (2), and the right side of the outer surface of the overflow valve 2 (9) is connected to the two-position two-way solenoid valve 1 (8). The overflow valve 2 (9) is used to control the lifting, lowering, neutral position or floating of the tractor.

2. A tractor electronically controlled lifting and hydraulic output hydraulic system according to claim 1, characterized in that: The overflow valve 1 (3) and the three-position four-way solenoid valve 1 (4) form a flow-limiting connection, and the left side of the outer surface of the three-position four-way solenoid valve 1 (4) is connected to the three-position four-way solenoid valve 2 (5) through a pipeline, and the left side of the outer surface of the three-position four-way solenoid valve 2 (5) is connected to the three-position four-way solenoid valve 3 (6) through a pipeline.

3. A tractor electronically controlled lifting and hydraulic output hydraulic system according to claim 2, characterized in that: The left side of the outer surface of the three-position four-way solenoid valve three (6) is connected to the three-position four-way solenoid valve four (7) through a pipeline, and the left side of the outer surface of the three-position four-way solenoid valve four (7) is connected to the two-position two-way solenoid valve one (8) through a pipeline.

4. The tractor electronically controlled lifting and hydraulic output hydraulic system according to claim 1, characterized in that: The three-position four-way solenoid valve one (4), the three-position four-way solenoid valve two (5), the three-position four-way solenoid valve three (6) and the three-position four-way solenoid valve four (7) are assembled in sequence from right to left, and the three-position four-way solenoid valve one (4), the three-position four-way solenoid valve two (5), the three-position four-way solenoid valve three (6) and the three-position four-way solenoid valve four (7) respectively form a parallel structure with the overflow valve one (3) and the two-position two-way solenoid valve one (8).

5. A tractor electronically controlled lifting and hydraulic output hydraulic system according to claim 4, characterized in that: The upper side of the outer surface of the overflow valve 2 (9) is connected to a three-position four-way solenoid valve 5 (10), and the left side of the upper surface of the three-position four-way solenoid valve 5 (10) is installed with a two-position two-way solenoid valve 2 (11), and the right side of the upper surface of the three-position four-way solenoid valve 5 (10) is installed with a two-position two-way solenoid valve 3 (12).

6. A tractor electronically controlled lifting and hydraulic output hydraulic system according to claim 5, characterized in that: The three-position four-way solenoid valve five (10) forms a parallel structure with the two-position two-way solenoid valve two (11) and the two-position two-way solenoid valve three (12).

Images