CN114876889A - Method and system for stably controlling lifting of machine and tractor - Google Patents
Method and system for stably controlling lifting of machine and tractor Download PDFInfo
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- CN114876889A CN114876889A CN202210703089.2A CN202210703089A CN114876889A CN 114876889 A CN114876889 A CN 114876889A CN 202210703089 A CN202210703089 A CN 202210703089A CN 114876889 A CN114876889 A CN 114876889A
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- 238000000034 method Methods 0.000 title claims abstract description 50
- 239000000725 suspension Substances 0.000 claims abstract description 34
- 230000007423 decrease Effects 0.000 claims abstract description 4
- 239000003921 oil Substances 0.000 claims description 95
- 239000010720 hydraulic oil Substances 0.000 claims description 56
- 230000001174 ascending effect Effects 0.000 claims description 23
- 230000007246 mechanism Effects 0.000 claims description 19
- 238000009499 grossing Methods 0.000 claims 2
- 230000000630 rising effect Effects 0.000 abstract description 3
- 230000008859 change Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000004044 response Effects 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/26—Supply reservoir or sump assemblies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/026—Pressure compensating valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/027—Check valves
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lifting Devices For Agricultural Implements (AREA)
Abstract
The invention discloses a method and a system for stably controlling the lifting of a machine and a tractor, and belongs to the technical field of tractors. The inlet of main pump connects the oil tank, and the export is connected with electromagnetic switch valve, compensating valve, rise control solenoid valve and first electromagnetic directional valve in proper order, and the export of first electromagnetic directional valve is connected respectively and is hung the pole chamber and the rodless chamber of hydro-cylinder, first check valve is connected between the rodless chamber of first electromagnetic directional valve and suspension hydro-cylinder, the entry linkage of decline control solenoid valve is between the rodless chamber and the first check valve of suspension hydro-cylinder, the outlet connection oil tank, first electromagnetic directional valve and compensating valve still are provided with the export of being connected with the oil tank. The invention realizes the stable control of the rising and the falling of the machine tool, adds the electromagnetic directional valve, realizes the strong pressure mode of the hard land parcel and the floating control of the machine tool, is provided with the compensation valve, realizes the stability of the output flow and the pressure, and realizes the combined automatic control of the hydraulic output and the lifting of the machine tool and the ground head management function.
Description
Technical Field
The invention relates to a method and a system for stably controlling the lifting of a machine and a tractor, and belongs to the technical field of tractors.
Background
In the actual work of the tractor, the implement needs to be controlled, and the implement is generally realized by a tractor lifting system. For the lifting system, a mechanical lifting system and an electro-hydraulic lifting system are provided, and the functions of ascending, descending, floating, stopping and the like of the machine tool are mainly realized. In field operation, strong pressure or floating control is required, and when the machine reaches the ground, ascending/descending control of the machine is required. Various modes are frequently used, and the lifting of the machine tool is very important to be stably controlled due to the fact that the machine tool is heavy.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a method and a system for stably controlling the lifting of a machine and a tractor, so as to solve the technical problem that the lifting stability of the tractor is poor in the prior art.
In order to solve the technical problem, the invention is realized by adopting the following scheme:
the invention provides a machine lifting stable control system, which comprises an oil tank, a main pump, an electromagnetic switch valve, a compensation valve, a lifting control electromagnetic valve, a first electromagnetic directional valve, a first one-way valve, a descending control electromagnetic valve and a suspension oil cylinder in a suspension mechanism, wherein the main pump is arranged on the oil tank;
the inlet of main pump connects the oil tank, and the export is connected with electromagnetic switch valve, compensating valve, rise control solenoid valve and first electromagnetic directional valve in proper order, and the pole chamber and the rodless chamber that have of hanging the hydro-cylinder are connected respectively to the export of first electromagnetic directional valve, first check valve is connected between the rodless chamber of first electromagnetic directional valve and hanging the hydro-cylinder, the entry linkage of decline control solenoid valve is between the rodless chamber and the first check valve of hanging the hydro-cylinder, and the outlet connection oil tank, first electromagnetic directional valve and compensating valve still are provided with the export of being connected with the oil tank.
Preferably, the ascending control electromagnetic valve and the descending control electromagnetic valve are electric proportional flow valves controlled by large current.
Preferably, the suspension mechanism is a three-point suspension.
Preferably, the device further comprises a first mechanical reversing valve, a second mechanical reversing valve and a second electromagnetic reversing valve; the first mechanical reversing valve and the second mechanical reversing valve are sequentially connected between the main pump and the electromagnetic switch valve, the first mechanical reversing valve and the second mechanical reversing valve are also respectively connected between the main pump and the first working port and between the main pump and the second working port, and reversing inlets are mutually connected; the inlet of the second electromagnetic reversing valve is connected between the second mechanical reversing valve and the electromagnetic switch valve, and the outlet of the second electromagnetic reversing valve is connected with the third working port; and the first mechanical reversing valve, the second mechanical reversing valve and the second electromagnetic reversing valve are all provided with outlets connected with the oil tank.
Preferably, the reversing inlets of the first mechanical reversing valve and the second mechanical reversing valve which are connected with each other are provided with one-way valves.
Preferably, an overflow valve is connected in series between the oil outlet path of the main pump and the oil return path of the oil tank.
The invention also provides a tractor which is provided with the machine tool lifting stable control system.
The invention also provides a control method for stably controlling the lifting of the machine, which comprises one or more of the following control methods:
the method comprises the following steps:
the electromagnetic switch valve is not electrified, the ascending control electromagnetic valve is electrified, the first electromagnetic directional valve is electrified and reversed, a hydraulic oil source flows from the oil tank through the electromagnetic switch valve, the compensating valve, the ascending control electromagnetic valve, the reversed first electromagnetic directional valve and the first one-way valve by the operation of the main pump, enters a rodless cavity of the suspension oil cylinder, and the machine rises;
the second method comprises the following steps:
the descending control electromagnetic valve is electrified, hydraulic oil in a rodless cavity of the suspension oil cylinder flows back to the oil tank from the descending control electromagnetic valve, and the machine tool descends by means of self weight;
the third method comprises the following steps:
the electromagnetic switch valve is not powered, the ascending control electromagnetic valve and the descending control electromagnetic valve are powered, the first electromagnetic directional valve is powered for reversing, a hydraulic oil source flows from the oil tank through the electromagnetic switch valve, the compensating valve, the ascending control electromagnetic valve and the reversed first electromagnetic directional valve by the operation of the main pump and enters the rod cavity of the suspension oil cylinder, hydraulic oil in the rodless cavity of the suspension oil cylinder flows back to the oil tank from the descending control electromagnetic valve, and the machine is forced to descend;
the method four comprises the following steps:
the descending control electromagnetic valve is electrified, hydraulic oil in the rodless cavity and the rod cavity of the suspension oil cylinder respectively flows through the descending control electromagnetic valve and the first electromagnetic directional valve and flows back to the oil tank, and the machine floats.
Preferably, one or more of the following control methods are also included:
the method comprises the following steps:
the electromagnetic switch valve and the ascending control electromagnetic valve are not electrified, a hydraulic oil source runs from the main pump, flows through the electromagnetic switch valve from the oil tank, enters the compensating valve, flows back to the oil tank, and is unloaded at low pressure;
the second method comprises the following steps:
the first mechanical reversing valve is operated for reversing, a hydraulic oil source flows from an oil tank through the first mechanical reversing valve for reversing by the operation of a main pump, and enters a first working port to supply hydraulic oil for a first working mechanism on the tractor and/or recover the hydraulic oil;
the third method comprises the following steps:
the second mechanical reversing valve is operated for reversing, a hydraulic oil source flows from the oil tank through the second mechanical reversing valve for reversing by the operation of the main pump, and enters the second working port to supply hydraulic oil for a second working mechanism on the tractor and/or recover the hydraulic oil;
the method four comprises the following steps:
the electromagnetic switch valve is electrified, the second electromagnetic directional valve is electrified for reversing, the hydraulic oil source flows through the first mechanical directional valve and the second mechanical directional valve from the oil tank by the operation of the main pump, enters the second electromagnetic directional valve for reversing, and finally enters the third working port for supplying hydraulic oil to a third working mechanism on the tractor and/or recovering the hydraulic oil.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention realizes the stable control of the rising and the falling of the machine tool, adds the electromagnetic directional valve of the function position in the H shape, realizes the strong pressure mode of the hard land and the floating control of the machine tool, and is provided with the compensation valve to realize the stability of the output flow and the pressure.
2. The ascending control electromagnetic valve and the descending control electromagnetic valve of the invention adopt the electric proportional flow valve controlled by large current, and can proportionally realize the opening change of the electromagnetic valve, thereby realizing the proportional change of flow, namely realizing good micro-motion control, also ensuring higher control precision, greatly improving the response time of the system, weakening the influence of friction force and reducing the hysteresis loop of the electromagnetic valve.
3. When hydraulic output is not operated, the hydraulic control system can unload through the low pressure of the compensating valve, and the energy of the system is saved.
4. The tractor is provided with a plurality of groups of mechanical and electrohydraulic hydraulic output links for supplying hydraulic oil to a working mechanism on the tractor to assist in completing the whole operation of the tractor.
Drawings
FIG. 1 is a hydraulic schematic diagram of a control system for stabilizing the lifting of a machine according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a load pressure compensating valve according to an embodiment of the present invention;
in the figure: 1. an oil inlet joint; 2. a mechanical hydraulic output link; 3. an electric control hydraulic output link; 4. an end cap; 5. a spring; 6. a valve body; 7. a valve core; 8. a lifting control unit; 9. a compensation valve; 10. a rise control solenoid valve; 11. a first electromagnetic directional valve; 12. a drop control solenoid valve.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
Example 1:
the embodiment provides a machine lifting and stabilizing control system, a hydraulic schematic diagram of which is shown in fig. 1 and comprises an oil inlet joint 1, a mechanical hydraulic output joint 2, an electric control hydraulic output joint 3, a lifting control joint 8 and a suspension oil cylinder in a suspension mechanism, wherein the suspension oil cylinder specifically comprises an oil tank, a main pump, an electromagnetic switch valve, a compensating valve 9, a lifting control electromagnetic valve 10, a first electromagnetic directional valve 11, a first one-way valve, a descending control electromagnetic valve 12 and the suspension oil cylinder in the suspension mechanism; the inlet of main pump connects the oil tank, and the export is connected with electromagnetic switch valve, compensating valve 9, rising control solenoid valve 10 and first electromagnetic directional valve 11 in proper order, and the export of first electromagnetic directional valve 11 is connected from B4 mouth and A4 mouth respectively and is hung the pole chamber and the rodless chamber of hydro-cylinder, first check valve is connected between the rodless chamber of first electromagnetic directional valve 11 and suspension hydro-cylinder, and the 12 entry linkage of decline control solenoid valve is between the rodless chamber and the first check valve of suspension hydro-cylinder, and the exit linkage oil tank, first electromagnetic directional valve 11 and compensating valve 9 still are provided with the export of being connected with the oil tank.
The ascending control electromagnetic valve 10 and the descending control electromagnetic valve 12 are electric proportional flow valves controlled by large current, and the opening degree of the electromagnetic valves can be changed proportionally, so that the proportional change of flow is realized, that is, good micro-motion control can be realized, higher control precision can be ensured, the response time of the system is greatly prolonged, the influence of friction is weakened, and the hysteresis loop of the electromagnetic valves is reduced.
The mechanical hydraulic output unit 2 and the electric control hydraulic output unit 3 comprise a first mechanical reversing valve, a second mechanical reversing valve and a second electromagnetic reversing valve; the first mechanical reversing valve and the second mechanical reversing valve are sequentially connected between the main pump and the electromagnetic switch valve, the first mechanical reversing valve and the second mechanical reversing valve are also respectively connected between the main pump and the first working port and between the main pump and the second working port, and reversing inlets are mutually connected; the inlet of the second electromagnetic reversing valve is connected between the second mechanical reversing valve and the electromagnetic switch valve, and the outlet of the second electromagnetic reversing valve is connected with the third working port; and the first mechanical reversing valve, the second mechanical reversing valve and the second electromagnetic reversing valve are all provided with outlets connected with the oil tank. The reversing inlets of the first mechanical reversing valve and the second mechanical reversing valve which are connected with each other are provided with one-way valves, so that the hydraulic oil is prevented from flowing back. The multiple groups of mechanical and electrohydraulic hydraulic output couplings supply hydraulic oil to the multiple groups of working mechanisms on the tractor to assist in completing the whole machine operation and the ground management of the tractor.
In addition, the suspension mechanism is a three-point suspension; an overflow valve is connected in series between an oil outlet path of the main pump and an oil return path of the oil tank and used for protecting the whole hydraulic loop.
As shown in fig. 2, the compensation valve 9 provided in this embodiment mainly includes an end cap 4, a spring 5, a valve body 6, and a valve core 7. When the lifting control unit 8 is under lifting and pressure-intensifying control, a fixed pressure difference is formed between the pressure P at the outlet of the main pump and the pressure LS fed back by the load, which can play a role in stabilizing the LS, and at this time, the flow passing through the right function position Y2b and the left function position Y3b of the first electromagnetic directional valve 11 is only related to the opening size of the right function position Y1b of the lifting control electromagnetic valve 10 and is unrelated to the fluctuation change of the load, so that the stability of the control pressure is ensured, and the stability of the output flow and the pressure is realized. Wherein, the work function position of the compensation valve 9 is controlled by whether the Y1b of the first electromagnetic directional valve 11 is electrified or not: when Y10b is de-energized, the compensator valve 9 operates in the right function position, and when Y10b is energized, the compensator valve 9 operates in the left function position, and when the load demand flow is less than the main pump outlet flow, the compensator valve 9 operates in the middle function position. In addition, low-pressure unloading can be completed through the compensating valve 9, and system energy is saved.
The embodiment realizes the stable control of the ascending and descending of the machine tool, increases the electromagnetic directional valve, realizes the strong pressure mode of the hard land parcel and the floating control of the machine tool, is provided with the compensation valve, realizes the stability of output flow and pressure, and realizes the combined automatic control of hydraulic output and machine tool lifting and the ground head management function.
Example 2
The embodiment provides a control method for stably controlling the lifting of a machine, which is based on a hydraulic schematic diagram shown in fig. 1, and provides respective control methods of the machine lifting stable control system in four states (machine lifting, machine lowering depending on self-weight, machine forced lowering and machine floating), wherein the respective control methods in the four states can be continuously controlled or combined at will, and specifically comprises the following steps:
the mechanical hydraulic output joint 2 and the electric control hydraulic working joint 3 do not work, when the lifting control joint 8 works,
the method comprises the following steps:
when the Y7b of the electromagnetic switch valve is not electrified, and the Y1b of the ascending control electromagnetic valve 10 is electrified, the compensating valve 9 works at a left functional position, the Y3b of the first electromagnetic directional valve 11 is electrified and is switched to the left functional position to carry out oil circuit reversing, a hydraulic oil source flows from an oil tank through the normal functional position of the electromagnetic switch valve, the left functional position of the compensating valve 9, the right functional position of the ascending control electromagnetic valve 10, the left functional position of the first electromagnetic directional valve 11 and the first one-way valve to enter a rodless cavity of the suspension oil cylinder from the operation of a main pump, and the machine tool realizes ascending;
the second method comprises the following steps:
when Y4b of the descending control electromagnetic valve 12 is electrified and the other electromagnetic valves are not electrified, hydraulic oil in the rodless cavity of the suspension oil cylinder directly flows back to the oil tank from the upper energy level of the descending control electromagnetic valve 12, and the machine tool descends by relying on self weight;
the third method comprises the following steps:
the Y7b of the electromagnetic switch valve is not electrified, the Y1b of the ascending control electromagnetic valve 10 is electrified, the compensating valve 9 works at a left functional position, the Y4b of the descending control electromagnetic valve 12 is electrified, the Y2b of the first electromagnetic reversing valve 11 is electrified and is switched to a right functional position to carry out oil circuit reversing, a hydraulic oil source flows from an oil tank through the normal functional position of the electromagnetic switch valve, the left functional position of the compensating valve 9, the right functional position of the ascending control electromagnetic valve 10 and the right functional position of the first electromagnetic reversing valve 11 to enter a rod cavity of the suspension oil cylinder by the operation of a main pump, hydraulic oil in a rodless cavity of the suspension oil cylinder flows back to the oil tank from the upper functional position of the descending control electromagnetic valve 12, and the machine realizes forced descending;
the method four comprises the following steps:
the Y4b of the descending control electromagnetic valve 12 is electrified, the other electromagnetic valves are not electrified, the hydraulic oil in the rodless cavity and the rod cavity of the suspension oil cylinder respectively flows through the upper energy level of the descending control electromagnetic valve 12 and the H-shaped middle energy level of the first electromagnetic directional valve 11 and flows back to the oil tank, and the floating of the machine tool is realized.
The four control methods realize the stable control of the ascending and descending of the machine tool, the electromagnetic directional valve of the function position in the H shape is added, the strong pressure mode of the hard land block and the floating control of the machine tool are realized, and the compensation valve is arranged to realize the stability of the output flow and the pressure.
In addition, the method for controlling the smoothness of the lifting of the implement according to this embodiment is controlled based on the hydraulic schematic diagram shown in fig. 1, and further provides respective control methods of the system for controlling the smoothness of the lifting of the implement in four states (low-pressure unloading, first working port hydraulic output, second working port hydraulic output, and electric control hydraulic output), where the control methods in the four states may be continuous control or may be combined arbitrarily; and the control method under the above four states (machines and tools rise, machines and tools drop depending on dead weight, machines and tools drop forcibly and machines and tools float) respectively, the same can be continuously controlled, also can be combined arbitrarily, specifically:
the method comprises the following steps:
when the Y7b of the electromagnetic switch valve and the Y1b of the ascending control electromagnetic valve 10 are not electrified, the compensating valve 9 works at the right energy position, a hydraulic oil source flows from the oil tank through the normal energy position of the electromagnetic switch valve by the operation of a main pump, enters the right energy position of the compensating valve 9, and flows back to the oil tank to finish low-pressure unloading. The control method can complete low-pressure unloading through the compensating valve 9, and saves system energy.
The lifting control unit 8 and the electric control hydraulic working unit 3 do not work, when the mechanical hydraulic output unit 2 works,
the second method comprises the following steps:
the mechanical handle of the first mechanical reversing valve is operated to change the direction of an oil path, a hydraulic oil source runs from an oil tank through a main pump to flow through an upper functional position or a lower functional position in the first mechanical reversing valve to complete the reversing, and the hydraulic oil enters a first working port A1 or B1 to supply hydraulic oil for a first working mechanism on a tractor and/or recover the hydraulic oil, and the method specifically comprises the following steps: if the mechanical handle is operated to enable the first mechanical reversing valve to be reversed to an upper energy position, oil at the outlet of the main pump flows into a working port A1 to be output, and a working port B1 is connected with a port T of the oil tank to directly return oil; if the mechanical handle is operated to enable the first mechanical reversing valve to reverse to the lower functional position, pump outlet oil is connected with a working port B1 to output hydraulic oil, and a working port A1 is connected with a fuel tank port T to directly return oil.
The third method comprises the following steps:
the mechanical handle of the second mechanical reversing valve is operated to change the direction of an oil path, a hydraulic oil source runs from the oil tank by a main pump to flow through an upper machine position or a lower machine position in the second mechanical reversing valve to complete the reversing, and the hydraulic oil enters a second working port A2 or B2 to supply hydraulic oil for a second working mechanism on the tractor and/or recover the hydraulic oil, and the method specifically comprises the following steps: if the mechanical handle is operated to enable the second mechanical reversing valve to be reversed to an upper energy position, oil at the outlet of the main pump flows into a working port A2 to be output, and a working port B2 is connected with a port T of the oil tank to directly return oil; if the mechanical handle is operated to enable the second mechanical reversing valve to be reversed to a lower energy position, pump outlet oil is connected with a working port B2 to output hydraulic oil, and a working port A2 is connected with a fuel tank port T to directly return oil.
The lifting control unit 8 and the mechanical hydraulic output unit 2 do not work, when the electric control hydraulic working unit 3 works,
the method four comprises the following steps:
the Y7B of the electromagnetic switch valve is electrified, the electromagnetic switch valve works at the right functional position, hydraulic oil cannot enter the lifting control unit 8, the second electromagnetic directional valve Y5B or Y6B is electrified to carry out oil circuit reversing, a hydraulic oil source runs by a main pump, flows through the normal functional position of the first mechanical directional valve and the normal functional position of the second mechanical directional valve from an oil tank, enters the upper functional position or the lower functional position of the second electromagnetic directional valve to complete reversing, and finally enters the third working port A3 or B3 to supply hydraulic oil for a third working mechanism on the tractor and/or recover the hydraulic oil, and the hydraulic oil recovery device specifically comprises: if the second electromagnetic directional valve is reversed to the upper energy level, oil at the outlet of the main pump flows into a working port A3 for output, and a working port B3 is connected with a port T of an oil tank for direct oil return; if the second electromagnetic directional valve is switched to the lower functional position, the outlet oil of the pump is connected with the port B3 of the working port to output hydraulic oil, and the port A3 of the working port is connected with the port T of the oil tank to directly return oil.
The four control methods save system energy by low-pressure unloading of the compensating valve, and are provided with a plurality of groups of mechanical and electrohydraulic hydraulic output couplings for supplying hydraulic oil to a working mechanism on the tractor to assist in completing the whole operation of the tractor.
The embodiment realizes the combined automatic control of the hydraulic output of the whole tractor and the lifting of the machine tool, the machine tool has strong pressure and floating control, the lifting stability is good, the jogging control and the accurate control of the machine tool are well realized, and the response time of the system is greatly prolonged.
Example 3
Based on the system for controlling the smooth lifting of the machine and the method for controlling the smooth lifting of the machine in the embodiment 1 and 2, the embodiment provides a tractor, the tractor is provided with the system for controlling the smooth lifting of the machine in the embodiment 1, the smooth lifting of the machine is controlled based on the method for controlling the smooth lifting of the machine in the embodiment 2, and the automatic control of the hydraulic output of the whole tractor is realized.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A machine lifting stable control system is characterized by comprising an oil tank, a main pump, an electromagnetic switch valve, a compensation valve, a lifting control electromagnetic valve, a first electromagnetic directional valve, a first one-way valve, a descending control electromagnetic valve and a suspension oil cylinder in a suspension mechanism;
the inlet of main pump connects the oil tank, and the export is connected with electromagnetic switch valve, compensating valve, rise control solenoid valve and first electromagnetic directional valve in proper order, and the pole chamber and the rodless chamber that have of hanging the hydro-cylinder are connected respectively to the export of first electromagnetic directional valve, first check valve is connected between the rodless chamber of first electromagnetic directional valve and hanging the hydro-cylinder, the entry linkage of decline control solenoid valve is between the rodless chamber and the first check valve of hanging the hydro-cylinder, and the outlet connection oil tank, first electromagnetic directional valve and compensating valve still are provided with the export of being connected with the oil tank.
2. The implement lift smoothing control system of claim 1, wherein the up and down control solenoids are high current controlled electro proportional flow valves.
3. The implement ride control system of claim 1, wherein the suspension mechanism is a three-point suspension.
4. The implement lift smoothing control system of claim 1, further comprising a first mechanical directional valve, a second mechanical directional valve, and a second electromagnetic directional valve; the first mechanical reversing valve and the second mechanical reversing valve are sequentially connected between the main pump and the electromagnetic switch valve, the first mechanical reversing valve and the second mechanical reversing valve are also respectively connected between the main pump and the first working port and between the main pump and the second working port, and reversing inlets are mutually connected; the inlet of the second electromagnetic reversing valve is connected between the second mechanical reversing valve and the electromagnetic switch valve, and the outlet of the second electromagnetic reversing valve is connected with the third working port; and the first mechanical reversing valve, the second mechanical reversing valve and the second electromagnetic reversing valve are all provided with outlets connected with the oil tank.
5. An implement lift leveling control system as defined in claim 4, wherein the interconnected directional inlet ports of the first and second mechanical directional valves are each provided with a one-way valve.
6. The implement lift leveling control system of claim 1, wherein an overflow valve is coupled in series between the main pump outlet and the tank return.
7. A tractor, characterised in that the tractor is provided with an implement ride control system as claimed in any one of claims 1 to 6.
8. The machine lifting smooth control method is characterized by comprising one or more of the following control methods:
the method comprises the following steps:
the electromagnetic switch valve is not electrified, the ascending control electromagnetic valve is electrified, the first electromagnetic directional valve is electrified and reversed, a hydraulic oil source flows from the oil tank through the electromagnetic switch valve, the compensating valve, the ascending control electromagnetic valve, the reversed first electromagnetic directional valve and the first one-way valve by the operation of the main pump, enters a rodless cavity of the suspension oil cylinder, and the machine rises;
the second method comprises the following steps:
the descending control electromagnetic valve is electrified, hydraulic oil in a rodless cavity of the suspension oil cylinder flows back to the oil tank from the descending control electromagnetic valve, and the machine tool descends by means of self weight;
the third method comprises the following steps:
the electromagnetic switch valve is not powered, the ascending control electromagnetic valve and the descending control electromagnetic valve are powered, the first electromagnetic directional valve is powered for reversing, a hydraulic oil source flows from the oil tank through the electromagnetic switch valve, the compensating valve, the ascending control electromagnetic valve and the reversed first electromagnetic directional valve by the operation of the main pump and enters the rod cavity of the suspension oil cylinder, hydraulic oil in the rodless cavity of the suspension oil cylinder flows back to the oil tank from the descending control electromagnetic valve, and the machine is forced to descend;
the method four comprises the following steps:
the descending control electromagnetic valve is electrified, hydraulic oil in the rodless cavity and the rod cavity of the suspension oil cylinder respectively flows through the descending control electromagnetic valve and the first electromagnetic directional valve and flows back to the oil tank, and the machine floats.
9. The implement ride up-down control method of claim 8, further comprising one or more of the following control methods:
the method comprises the following steps:
the electromagnetic switch valve and the ascending control electromagnetic valve are not electrified, a hydraulic oil source runs from the main pump, flows through the electromagnetic switch valve from the oil tank, enters the compensating valve, flows back to the oil tank, and is unloaded at low pressure;
the second method comprises the following steps:
the first mechanical reversing valve is operated for reversing, a hydraulic oil source flows from an oil tank through the first mechanical reversing valve for reversing by the operation of a main pump, and enters a first working port to supply hydraulic oil for a first working mechanism on the tractor and/or recover the hydraulic oil;
the third method comprises the following steps:
the second mechanical reversing valve is operated for reversing, a hydraulic oil source flows from the oil tank through the second mechanical reversing valve for reversing by the operation of the main pump, and enters the second working port to supply hydraulic oil for a second working mechanism on the tractor and/or recover the hydraulic oil;
the method four comprises the following steps:
the electromagnetic switch valve is electrified, the second electromagnetic directional valve is electrified for reversing, the hydraulic oil source flows through the first mechanical directional valve and the second mechanical directional valve from the oil tank by the operation of the main pump, enters the second electromagnetic directional valve for reversing, and finally enters the third working port for supplying hydraulic oil to a third working mechanism on the tractor and/or recovering the hydraulic oil.
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