CN114439787B - Tractor plow depth control hydraulic system and method - Google Patents
Tractor plow depth control hydraulic system and method Download PDFInfo
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- CN114439787B CN114439787B CN202210104733.4A CN202210104733A CN114439787B CN 114439787 B CN114439787 B CN 114439787B CN 202210104733 A CN202210104733 A CN 202210104733A CN 114439787 B CN114439787 B CN 114439787B
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000001105 regulatory effect Effects 0.000 claims abstract description 65
- 238000006073 displacement reaction Methods 0.000 claims abstract description 13
- 239000003921 oil Substances 0.000 claims description 193
- 239000010720 hydraulic oil Substances 0.000 claims description 45
- 230000001276 controlling effect Effects 0.000 claims description 23
- 230000000903 blocking effect Effects 0.000 claims description 4
- 239000000872 buffer Substances 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 4
- 230000001174 ascending effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 230000002860 competitive effect Effects 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
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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
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
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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
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more 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
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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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 tractor plow depth control hydraulic system and a method, which reduce two inherent proportional speed regulating valves in the current industry application into one through the combination of electromagnetic reversing valves, realize stepless speed regulation of plow depth control lifting by one proportional speed regulating valve, replace one proportional speed regulating valve through the combination of two-position two-way electromagnetic reversing valves, increase the pressure compensation function of proportional reduction, save the cost, and make the product more competitive; the lifting and lowering of the plow depth control has the pressure compensation function, and the lifting and lowering both adopt oil inlet speed regulation to replace the existing oil return speed regulation during lowering, so that the displacement control is more accurate and sensitive, and the pressure loss is reduced. The plow depth control of the tractor is more accurate and sensitive, and the cost is saved.
Description
Technical Field
The invention belongs to the technical field of plow depth control methods, and particularly relates to a hydraulic system and a hydraulic method for controlling the plow depth of a tractor.
Background
In the prior art, an electric control lifter with a proportional speed regulating valve is commonly adopted for an agricultural tractor, but two proportional speed regulating valves are commonly adopted for an electric control lifting system which is commonly matched at present, and the cost is high. And when the plough deep oil cylinder descends, the proportional speed regulation has no pressure compensation function, and the disadvantage is that when the oil cylinder descends, the displacement control is not accurate enough, and the sensitivity of the displacement control of the proportional valve is poor. If a pressure compensating valve is added, the cost is increased. In addition, when the oil cylinder descends, oil return speed regulation is adopted, and pressure loss is large.
Disclosure of Invention
The invention aims to provide a hydraulic system and a method for controlling the plough depth of a tractor, so as to solve the problems in the prior art.
In order to achieve the above purpose, the present invention specifically adopts the following technical scheme:
a tractor plow depth control hydraulic system, which comprises a speed regulation module, a pressure compensation module and a reversing module,
the tractor oil pump is connected with the input end of the speed regulation module, the output end of the speed regulation module is connected with the input end of the reversing module, the output end of the speed regulation module is also connected with a rod cavity of the tractor plow depth control oil cylinder through a special valve group, a first port of the reversing module is connected with a rodless cavity of the tractor plow depth control oil cylinder, a second port of the reversing module is connected with the tractor oil tank, a pressure compensation module is provided with an oil way and is communicated with the first pressure sensing port with a pressure sensing function, the pressure compensation module is provided with an oil way and is communicated with the second pressure sensing port with a pressure sensing function, the second pressure sensing port with an oil way communication function is connected with the output end of the speed regulation module, and an oil discharging port with an oil way communication function is connected with the tractor oil tank;
the speed regulation module is used for regulating the flow of hydraulic oil output by the tractor oil pump and passing through the speed regulation module, so as to push the tractor plow depth to control the lifting speed of the oil cylinder; the pressure compensation module is used for keeping the pressure difference between the input end and the output end of the speed regulation module constant so as to enable the flow rate of hydraulic oil output by the speed regulation module to be constant; the reversing module is used for controlling the flow direction of hydraulic oil, and further controlling the hydraulic oil in the rod cavity and the rodless cavity of the tractor plow depth control oil cylinder to enter and exit, so that the tractor plow depth control oil cylinder is pushed to ascend and descend, and the tractor plow depth is controlled.
As a preferable technical scheme of the invention, the speed regulating module is a proportional speed regulating valve, the tractor oil pump is connected with an oil inlet port of the proportional speed regulating valve, an oil outlet port of the proportional speed regulating valve is connected with an input end of the reversing module, and the oil outlet port of the proportional speed regulating valve is also connected with a rod cavity of the tractor plough depth control oil cylinder through a special valve group.
As a preferable technical scheme of the invention, the pressure compensation module comprises a pressure compensation valve and a throttling plate, wherein the pressure compensation valve is provided with an oil way and is connected with the input end of the speed regulation module, a first pressure sensing port with a pressure sensing function is connected with the input end of the speed regulation module, the pressure compensation valve is provided with an oil way and is connected with the output end of the speed regulation module through the throttling plate, and an oil discharge port with an oil way communication function of the pressure compensation valve is connected with the tractor oil tank.
As a preferable technical scheme of the invention, the reversing module comprises a first electromagnetic reversing valve and a second electromagnetic reversing valve, wherein an oil inlet port of the first electromagnetic reversing valve is used as an input end of the reversing module and is connected with an output end of the speed regulating module, an oil outlet port of the first electromagnetic reversing valve is used as a first port of the reversing module and is respectively connected with an oil inlet port of the second electromagnetic reversing valve and a rodless cavity of the tractor plough depth control oil cylinder, and an oil outlet port of the second electromagnetic reversing valve is used as a second port of the reversing module and is connected with the tractor oil tank.
The method for controlling the hydraulic system by the tractor plow depth comprises the following steps of executing the following steps aiming at the hydraulic system by the tractor plow depth control, and realizing the control of the tractor plow depth, wherein the speed regulating module is a proportional speed regulating valve, the pressure compensating module comprises a throttling plate and a pressure compensating valve, and the reversing module comprises a first electromagnetic reversing valve and a second electromagnetic reversing valve;
step A: the tractor plough depth control hydraulic system is based on comprehensive feedback of the plough force and the depth of the tractor, and when the tractor plough descends, the tractor plough depth control hydraulic system controls the proportional speed regulating valve, the second electromagnetic directional valve and the special valve group to be electrified, controls the first electromagnetic directional valve to be powered off, and controls the tractor plough depth control oil cylinder to descend; the oil inlet port to the oil outlet port of the proportional speed regulating valve are communicated; based on comprehensive feedback of the plough force and depth of the tractor, controlling the opening of the proportional speed regulating valve, namely controlling the flow of hydraulic oil in the proportional speed regulating valve, and further controlling the descending speed of the plough depth control oil cylinder of the tractor; the oil inlet port to the oil outlet port of the second electromagnetic directional valve are conducted; the oil inlet port to the oil outlet port of the special valve bank are conducted; closing and isolating an oil inlet port to an oil outlet port of the first electromagnetic directional valve;
based on comprehensive feedback of the ploughing force and depth, hydraulic oil of a tractor oil pump enters a tractor plough depth control hydraulic system, the hydraulic oil enters a rod cavity of a tractor plough depth control oil cylinder through a proportional speed control valve and a special valve group, the tractor plough depth control oil cylinder is pushed to descend to a corresponding position of a set depth of a tractor plough, hydraulic oil of a rodless cavity of the tractor plough depth control oil cylinder enters the tractor plough depth control hydraulic system, the hydraulic oil enters a tractor oil tank through a second electromagnetic reversing valve, and the tractor plough descends to the set depth;
the tractor plough depth control hydraulic system controls the proportional speed regulating valve and the first electromagnetic directional valve to be electrified, controls the second electromagnetic directional valve and the special valve group to be powered off and controls the tractor plough depth control oil cylinder to ascend based on the comprehensive feedback of the plough force and the depth of the tractor; the oil inlet port to the oil outlet port of the proportional speed regulating valve are conducted, the opening degree of the proportional speed regulating valve is controlled based on comprehensive feedback of the plough force and the depth of the tractor, namely the flow rate of hydraulic oil in the proportional speed regulating valve is controlled, and the rising speed of the plough depth control oil cylinder of the tractor is further controlled; the oil inlet port to the oil outlet port of the first electromagnetic directional valve are conducted; sealing and blocking the oil inlet port to the oil outlet port of the second electromagnetic directional valve; blocking and closing an oil inlet port of the special valve group;
based on comprehensive feedback of the ploughing force and depth, hydraulic oil of a tractor oil pump enters a tractor control hydraulic system, and enters a rodless cavity of a tractor plough depth control oil cylinder through a proportional speed control valve and a first electromagnetic reversing valve to push the tractor plough depth control oil cylinder to rise to a corresponding position of a preset depth of a tractor plough, so that hydraulic oil of a rod cavity of the tractor plough depth control oil cylinder enters a tractor oil tank through a special valve group, and further the tractor plough rises to the preset depth.
As a preferable technical scheme of the invention, the pressure compensation module comprises a throttling plate and a pressure compensation valve, the throttling plate buffers the impact of an oil outlet port of the proportional speed regulation valve to a second pressure sensing port of the pressure compensation valve in the process of controlling the tractor plow depth by a tractor plow depth control hydraulic system, and the pressure compensation valve ensures constant pressure difference between the oil inlet port and the oil outlet port of the proportional speed regulation valve in the process of ascending and descending of an oil cylinder, so that the flow rate of hydraulic oil output by the proportional speed regulation valve is constant.
The beneficial effects of the invention are as follows: the invention provides a hydraulic system and a method for controlling the plough depth of a tractor, which enable the control of the plough displacement of the tractor to be more accurate and sensitive and save the cost. The combination of the electromagnetic reversing valves reduces two inherent proportional speed regulating valves in the current industry application into one proportional speed regulating valve, stepless speed regulation for controlling the lifting and lowering of the plow depth is realized by using one proportional speed regulating valve, and the two-position two-way electromagnetic reversing valve is used for replacing one proportional speed regulating valve, so that the pressure compensation function of proportional lowering is increased, the cost is saved, and the product is more competitive; the lifting and lowering of the plow depth control has the pressure compensation function, and the lifting and lowering both adopt oil inlet speed regulation, so that the displacement control is more accurate and sensitive, and the pressure loss is reduced.
Drawings
FIG. 1 is a schematic diagram of the present invention;
reference numerals: 1. a proportional speed regulating valve; 2. a first electromagnetic directional valve; 3. a second electromagnetic directional valve; 4. a throttle plate; 5. a pressure compensating valve.
Detailed Description
The invention is further described below with reference to the drawings and specific embodiments.
It should be understood that the detailed description is presented herein by way of example only and is not intended to limit the invention.
The utility model provides a tractor plough deep control hydraulic system, as shown in fig. 1, including speed governing module, pressure compensation module, the switching-over module, tractor oil pump is connected with speed governing module's input, speed governing module's output is connected with switching-over module's input, speed governing module's output still is connected with tractor plough deep control hydro-cylinder's pole chamber through special valves, switching-over module's first port is connected with tractor plough deep control hydro-cylinder's rodless chamber, switching-over module's second port is connected with tractor oil tank, pressure compensation module has the oil circuit intercommunication and has the first pressure sensing port of pressure sensing function to connect speed governing module's input, pressure compensation module has the oil circuit intercommunication and has the second pressure sensing port of pressure sensing function to connect speed governing module's output, pressure compensation module has the oil circuit intercommunication port of unloading of function to be connected with tractor oil tank.
By means of the combination of the electromagnetic reversing valves, two inherent proportional speed regulating valves in the current industry are reduced to one valve, the pressure compensation function of proportional reduction is added, and oil return speed regulation is changed into oil inlet speed regulation. The special valve group has the functions of on-off and unloading of the branch.
The speed regulation module is a proportional speed regulation valve 1, the tractor oil pump is connected with an oil inlet port of the proportional speed regulation valve 1, an oil outlet port of the proportional speed regulation valve 1 is connected with an input end of the reversing module, and the oil outlet port of the proportional speed regulation valve 1 is also connected with a rod cavity of the tractor plough depth control oil cylinder through a special valve group. The pressure compensation module comprises a pressure compensation valve 5 and a throttling plate 4, wherein the pressure compensation valve 5 is provided with an oil way communicated with a first pressure sensing port with a pressure sensing function and is connected with the input end of the speed regulation module, the pressure compensation valve 5 is provided with an oil way communicated with a second pressure sensing port with a pressure sensing function and is connected with the output end of the speed regulation module through the throttling plate 4, an oil discharging port of the pressure compensation valve 5 with the oil way communicated function is connected with a tractor oil tank, the system is in a non-working state and is equivalent to low pressure unloading, the throttling plate 4 buffers the impact of the pressure sensing port, the pressure compensation valve 5 ensures that the front-back pressure difference of the proportional speed regulation valve 1 is constant and is not influenced by load, and therefore the output flow of the proportional speed regulation valve 1 is constant. The reversing module comprises a first electromagnetic reversing valve 2 and a second electromagnetic reversing valve 3, wherein an oil inlet port of the first electromagnetic reversing valve 2 is used as an input end of the reversing module to be connected with an output end of the speed regulating module, an oil outlet port of the first electromagnetic reversing valve 2 is used as a first port of the reversing module to be respectively connected with an oil inlet port of the second electromagnetic reversing valve 3 and a rodless cavity of the tractor plough depth control cylinder, and an oil outlet port of the second electromagnetic reversing valve 3 is used as a second port of the reversing module to be connected with the tractor oil tank.
The speed regulation module is used for regulating the flow of hydraulic oil output by the tractor oil pump and passing through the speed regulation module, so as to further push the tractor plow depth to control the lifting and lowering speeds of the oil cylinder, and realize stepless speed regulation of lifting and lowering actions; the pressure compensation module is used for keeping the pressure difference between the input end and the output end of the speed regulation module constant so as to enable the flow rate of hydraulic oil output by the speed regulation module to be constant; the reversing module is used for controlling the flow direction of hydraulic oil in the tractor plough depth control hydraulic system, and further controlling the hydraulic oil in the rod cavity and the rodless cavity of the tractor plough depth control oil cylinder to enter and exit, so that the tractor plough depth control oil cylinder is pushed to ascend and descend, and the tractor plough depth is controlled.
The method for controlling the hydraulic system by the tractor plow depth comprises the following steps of executing the following steps aiming at the hydraulic system by the tractor plow depth control, and realizing the control of the tractor plow depth, wherein the speed regulating module is a proportional speed regulating valve 1, the pressure compensating module comprises a throttling plate 4 and a pressure compensating valve 5, and the reversing module comprises a first electromagnetic reversing valve 2 and a second electromagnetic reversing valve 3;
step A: the control module of the tractor plough depth control hydraulic system is based on the comprehensive feedback of the plough force and the depth of the tractor, when the tractor plough descends, namely the system program decides that the tractor is required to descend, the control module of the tractor plough depth control hydraulic system controls the proportional speed regulating valve 1, the second electromagnetic directional valve 3 and the special valve group to be electrified, controls the first electromagnetic directional valve 2 to be powered off, and controls the tractor plough depth control oil cylinder to descend; the oil inlet port to the oil outlet port of the proportional speed regulating valve 1 are communicated; based on comprehensive feedback of the plough force and the depth of the tractor, controlling the opening of the proportional speed regulating valve 1, namely controlling the flow of hydraulic oil in the proportional speed regulating valve 1, and further controlling the descending speed of the plough depth control oil cylinder of the tractor; the oil inlet port to the oil outlet port of the second electromagnetic directional valve 3 are conducted; the oil inlet port to the oil outlet port of the special valve bank are conducted; the oil inlet port to the oil outlet port of the first electromagnetic directional valve 2 are closed and blocked, at the moment, the first electromagnetic directional valve 2 is not electrified and is used for blocking, the valve has a one-way valve function, the leakage amount is small, the leakage of hydraulic oil can be effectively blocked, and the oil at the port A is ensured to return to the oil tank.
Based on comprehensive feedback of the ploughing force and depth, hydraulic oil of a tractor oil pump enters a tractor plough depth control hydraulic system from a port P, the hydraulic oil enters a rod cavity of a tractor plough depth control oil cylinder from a port B through a special valve group through a proportional speed regulating valve 1, the tractor plough depth control oil cylinder is pushed to descend to a position corresponding to the set depth of the tractor plough, namely, the position of the tractor plough depth control oil cylinder corresponding to the preset depth of the tractor plough, hydraulic oil of a rodless cavity of the tractor plough depth control oil cylinder enters the tractor plough depth control hydraulic system from a port A, and the hydraulic oil enters a tractor oil tank through a second electromagnetic reversing valve 3, so that the tractor plough descends to the set depth.
The control module of the tractor plough depth control hydraulic system controls the proportional speed regulating valve 1 and the first electromagnetic directional valve 2 to be electrified, controls the second electromagnetic directional valve 3 and the special valve group to be powered off, and controls the tractor plough depth control oil cylinder to ascend when the tractor plough ascends based on the comprehensive feedback of the plough force and the depth of the tractor; the oil inlet port to the oil outlet port of the proportional speed regulating valve 1 are conducted, the opening degree of the proportional speed regulating valve 1 is controlled based on comprehensive feedback of the plowing force and the depth of the tractor, namely the flow rate of hydraulic oil in the proportional speed regulating valve 1 is controlled, and the rising speed of a tractor plowing depth control oil cylinder is further controlled; the oil inlet port to the oil outlet port of the first electromagnetic directional valve 2 are conducted; the oil inlet port to the oil outlet port of the second electromagnetic directional valve 3 are blocked, the second electromagnetic directional valve 3 is not electrified, the second electromagnetic directional valve has a one-way valve function, the leakage amount is small, and hydraulic oil can be effectively blocked from leaking to the oil tank; the oil inlet port of the special valve group is blocked and closed.
Based on comprehensive feedback of the ploughing force and depth, hydraulic oil of a tractor oil pump enters a tractor control hydraulic system from a P port, enters a rodless cavity of a tractor plough depth control oil cylinder from an A port through a proportional speed control valve 1 and a first electromagnetic reversing valve 2, pushes the tractor plough depth control oil cylinder to rise to a corresponding position of a tractor plough preset depth, namely, the position of the tractor plough depth control oil cylinder corresponding to the tractor plough preset depth, and enables hydraulic oil of a rod cavity of the tractor plough depth control oil cylinder to enter a tractor oil tank through an oil outlet port of a special valve, so that the tractor plough rises to the preset depth. The pressure compensation valve 5 ensures that the front-rear pressure difference of the proportional speed regulating valve 1 is constant and is not influenced by load, so that the output flow of the proportional speed regulating valve 1 is constant.
The pressure compensation module comprises a throttling plate 4 and a pressure compensation valve 5, the throttling plate 4 buffers the impact of an oil outlet port of the proportional speed regulating valve 1 to a second pressure sensing port of the pressure compensation valve 5 in the process of controlling the tractor plow depth by a tractor plow depth control hydraulic system, and the pressure compensation valve 5 ensures constant pressure difference between the oil inlet port and the oil outlet port of the proportional speed regulating valve 1 in the ascending and descending processes of the oil cylinder, so that the flow rate of hydraulic oil output by the proportional speed regulating valve 1 is constant. When the pressure of the first pressure sensing port of the pressure compensating valve 5 exceeds the sum of the total pressure of the second pressure sensing port and the pre-pressure of the spring, the valve core moves, so that the hydraulic oil completely flows from the first pressure sensing port to the oil discharging port; when the second pressure sensing port is pressureless, hydraulic oil will flow completely from the first pressure sensing port to the oil discharge port once the pressure of the second pressure sensing port exceeds the pre-pressure of the spring.
The invention designs a hydraulic system and a method for controlling the plough depth of a tractor, which enable the control of the plough displacement of the tractor to be more accurate and sensitive and save the cost. The combination of the electromagnetic reversing valves reduces two inherent proportional speed regulating valves in the current industry application into one proportional speed regulating valve, stepless speed regulation for controlling the lifting and lowering of the plow depth is realized by using one proportional speed regulating valve, and the two-position two-way electromagnetic reversing valve is used for replacing one proportional speed regulating valve, so that the pressure compensation function of proportional lowering is increased, the cost is saved, and the product is more competitive; the lifting and lowering of the plow depth control has the pressure compensation function, and the lifting and lowering both adopt oil inlet speed regulation, so that the displacement control is more accurate and sensitive, and the pressure loss is reduced.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Claims (5)
1. A method for controlling a hydraulic system for a tractor plow depth, comprising the steps of: the tractor plow depth control hydraulic system comprises a speed regulation module, a pressure compensation module and a reversing module; the tractor oil pump is connected with the input end of the speed regulation module, the output end of the speed regulation module is connected with the input end of the reversing module, the output end of the speed regulation module is also connected with a rod cavity of the tractor plow depth control oil cylinder through a special valve group, a first port of the reversing module is connected with a rodless cavity of the tractor plow depth control oil cylinder, a second port of the reversing module is connected with the tractor oil tank, a pressure compensation module is provided with an oil way and is communicated with the first pressure sensing port with a pressure sensing function, the first pressure sensing port with the oil way is communicated with the input end of the speed regulation module, the second pressure sensing port with the pressure sensing function is connected with the output end of the speed regulation module, and the pressure compensation module is provided with the oil way communication function and is connected with the tractor oil tank; the speed regulation module is used for regulating the flow of hydraulic oil output by the tractor oil pump and passing through the speed regulation module, so as to further push the tractor plough depth control oil cylinder to rise and fall, and realize stepless speed regulation of the rising and falling actions of the tractor plough; the pressure compensation module is used for keeping the pressure difference between the input end and the output end of the speed regulation module constant so as to enable the flow rate of hydraulic oil output by the speed regulation module to be constant; the reversing module is used for controlling the flow direction of hydraulic oil, so as to control the hydraulic oil in the rod cavity and the rodless cavity of the tractor plow depth control oil cylinder to go in and out, and realize pushing the tractor plow depth control oil cylinder to rise and fall;
the method comprises the following steps of executing the following steps aiming at a tractor plow depth control hydraulic system to realize the control of the up-and-down movement of the tractor plow, wherein the speed regulating module is a proportional speed regulating valve (1), the pressure compensating module comprises a throttling piece (4) and a pressure compensating valve (5), and the reversing module comprises a first electromagnetic reversing valve (2) and a second electromagnetic reversing valve (3);
step A: when the tractor plow moves upwards, the tractor plow depth control hydraulic system receives comprehensive feedback of the tractor plow force and the tractor plow depth, controls the proportional speed regulating valve (1), the second electromagnetic directional valve (3) and the special valve group to be electrified, and controls the first electromagnetic directional valve (2) to be powered off; the oil inlet port to the oil outlet port of the proportional speed regulating valve (1) are conducted, the flow of hydraulic oil in the proportional speed regulating valve (1) is controlled based on comprehensive feedback of the plough force and the depth of the tractor, and the descending speed of the plough depth control oil cylinder of the tractor is further controlled; the oil inlet port to the oil outlet port of the second electromagnetic directional valve (3) are conducted; the oil inlet port to the oil outlet port of the special valve bank are conducted; closing and isolating an oil inlet port to an oil outlet port of the first electromagnetic directional valve (2);
based on the upward displacement of the tractor plow, hydraulic oil of a tractor oil pump enters a tractor plow depth control hydraulic system, the hydraulic oil enters a rod cavity of a tractor plow depth control oil cylinder through a proportional speed control valve (1) and a special valve group, the tractor plow depth control oil cylinder is pushed to descend to a position corresponding to the upward displacement of the tractor plow, hydraulic oil of a rodless cavity of the tractor plow depth control oil cylinder enters the tractor plow depth control hydraulic system, and the hydraulic oil enters a tractor oil tank through a second electromagnetic reversing valve (3), so that the tractor plow is moved upward for a set displacement;
step B, when the tractor plow moves downwards, the tractor plow depth control hydraulic system receives comprehensive feedback of the plow force and the depth of the tractor, controls the proportional speed regulating valve (1) and the first electromagnetic directional valve (2) to be electrified, and controls the second electromagnetic directional valve (3) and the special valve bank to be powered off; the oil inlet port of the proportional speed regulating valve (1) is conducted to the oil outlet port, and the flow of hydraulic oil in the proportional speed regulating valve (1) is controlled based on comprehensive feedback of the plough force and the depth of the tractor, so that the rising speed of the plough depth control oil cylinder of the tractor is controlled; controlling the flow of hydraulic oil in the proportional speed regulating valve (1); the oil inlet port to the oil outlet port of the first electromagnetic directional valve (2) are conducted; the oil inlet port to the oil outlet port of the second electromagnetic directional valve (3) are blocked in a sealing way; blocking and closing an oil inlet port to an oil outlet port of the special valve group;
based on the displacement of the tractor plow downward movement, hydraulic oil of a tractor oil pump enters a tractor control hydraulic system, and the hydraulic oil enters a rodless cavity of a tractor plow depth control oil cylinder through a proportional speed regulating valve (1) and a first electromagnetic reversing valve (2), so that the tractor plow depth control oil cylinder is pushed to rise to a corresponding position of the tractor plow upward movement displacement, and the hydraulic oil of a rod cavity of the tractor plow depth control oil cylinder enters a tractor oil tank through a special valve group, so that the tractor plow downward movement is set by displacement.
2. A method of tractor plow depth control hydraulic system according to claim 1, wherein: the throttling plate (4) buffers impact of an oil outlet port of the proportional speed regulating valve (1) on a second pressure sensing port of the pressure compensation valve (5), and the pressure compensation valve (5) ensures constant pressure difference between an oil inlet port and two ends of the oil outlet port of the proportional speed regulating valve (1) in the ascending and descending processes of the oil cylinder, so that the flow of hydraulic oil output by the proportional speed regulating valve (1) is constant.
3. A method of tractor plow depth control hydraulic system according to claim 1, wherein: the speed regulation module is a proportional speed regulation valve (1), an oil pump of the tractor is connected with an oil inlet port of the proportional speed regulation valve (1), and an oil outlet port of the proportional speed regulation valve (1) is respectively connected with an input end of the reversing module and a rod cavity of a plough depth control oil cylinder of the tractor.
4. A method of tractor plow depth control hydraulic system according to claim 1, wherein: the pressure compensation module comprises a pressure compensation valve (5) and a throttling plate (4), wherein the pressure compensation valve (5) is provided with an oil way communicated with a first pressure sensing port with a pressure sensing function and is connected with the input end of the speed regulation module, the pressure compensation valve (5) is provided with an oil way communicated with a second pressure sensing port with a pressure sensing function and is connected with the output end of the speed regulation module through the throttling plate (4), and the pressure compensation port of the pressure compensation valve (5) is connected with the tractor oil tank.
5. A method of tractor plow depth control hydraulic system according to claim 1, wherein: the reversing module comprises a first electromagnetic reversing valve (2) and a second electromagnetic reversing valve (3), wherein an oil inlet port of the first electromagnetic reversing valve (2) is connected with an output end of the speed regulating module, an oil outlet port of the first electromagnetic reversing valve (2) is used as a first port of the reversing module and is respectively connected with an oil inlet port of the second electromagnetic reversing valve (3) and a rodless cavity of the tractor plough depth control cylinder, and an oil outlet port of the second electromagnetic reversing valve (3) is used as a second port of the reversing module and is connected with the tractor oil tank.
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| CN202210104733.4A CN114439787B (en) | 2022-01-28 | 2022-01-28 | Tractor plow depth control hydraulic system and method |
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| CN202210104733.4A CN114439787B (en) | 2022-01-28 | 2022-01-28 | Tractor plow depth control hydraulic system and method |
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| CN114439787B true CN114439787B (en) | 2024-03-26 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02119705A (en) * | 1988-10-28 | 1990-05-07 | Iseki & Co Ltd | Hydraulic pressure controller in tractor |
| JPH06189605A (en) * | 1993-10-15 | 1994-07-12 | Iseki & Co Ltd | Working machine lift control unit in tractor |
| CN102900716A (en) * | 2012-11-09 | 2013-01-30 | 常德中联重科液压有限公司 | Feedback speed regulation device and engineering machinery |
| CN103672126A (en) * | 2013-12-26 | 2014-03-26 | 重庆川仪自动化股份有限公司 | Electro-hydraulic actuator |
| CN203702702U (en) * | 2013-11-25 | 2014-07-09 | 中联重科股份有限公司 | Hydraulic control system and concrete pumping equipment |
| CN109704223A (en) * | 2019-03-01 | 2019-05-03 | 中铁工程装备集团有限公司 | A kind of novel shield machine section of jurisdiction transport trolley hydraulic synchronous control system |
| CN111577678A (en) * | 2020-05-26 | 2020-08-25 | 中国铁建重工集团股份有限公司 | Hydraulic system of heading machine and heading machine |
| CN213574912U (en) * | 2020-10-20 | 2021-06-29 | 洛阳智能农业装备研究院有限公司 | Agricultural machinery electro-hydraulic lifting valve group |
| CN113700706A (en) * | 2021-07-09 | 2021-11-26 | 武汉船用机械有限责任公司 | Hydraulic control system for lifting device |
-
2022
- 2022-01-28 CN CN202210104733.4A patent/CN114439787B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02119705A (en) * | 1988-10-28 | 1990-05-07 | Iseki & Co Ltd | Hydraulic pressure controller in tractor |
| JPH06189605A (en) * | 1993-10-15 | 1994-07-12 | Iseki & Co Ltd | Working machine lift control unit in tractor |
| CN102900716A (en) * | 2012-11-09 | 2013-01-30 | 常德中联重科液压有限公司 | Feedback speed regulation device and engineering machinery |
| CN203702702U (en) * | 2013-11-25 | 2014-07-09 | 中联重科股份有限公司 | Hydraulic control system and concrete pumping equipment |
| CN103672126A (en) * | 2013-12-26 | 2014-03-26 | 重庆川仪自动化股份有限公司 | Electro-hydraulic actuator |
| CN109704223A (en) * | 2019-03-01 | 2019-05-03 | 中铁工程装备集团有限公司 | A kind of novel shield machine section of jurisdiction transport trolley hydraulic synchronous control system |
| CN111577678A (en) * | 2020-05-26 | 2020-08-25 | 中国铁建重工集团股份有限公司 | Hydraulic system of heading machine and heading machine |
| CN213574912U (en) * | 2020-10-20 | 2021-06-29 | 洛阳智能农业装备研究院有限公司 | Agricultural machinery electro-hydraulic lifting valve group |
| CN113700706A (en) * | 2021-07-09 | 2021-11-26 | 武汉船用机械有限责任公司 | Hydraulic control system for lifting device |
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| CN114439787A (en) | 2022-05-06 |
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