Farm implement lifting control valve and intelligent control method

Abstract

The invention provides a farm implement lifting control valve and an intelligent control method, and relates to the technical field of control valves. Comprising a pressure input module, a reversing valve module and a master control lifting module. The pressure input module is used for releasing pressure to an oil tank; the reversing valve module comprises two first reversing valve assemblies and a second reversing valve assembly, the two first reversing valve assemblies are used for controlling an adjusting driving part and a depth driving part respectively, and the second reversing valve assembly is used for controlling an overturning driving part; according to the agricultural implement lifting control valve and the intelligent control method, intelligent control is achieved, the main control lifting module has high and low speed conversion, the speed can be adjusted through a descending speed rotary knob, and during descending, high-speed descending is converted into low-speed descending, so that high-speed descending and low-speed descending are achieved; and the buffering function is achieved, violent shaking of the machine tool caused by sudden stop during rapid descending is avoided, the machine tool is protected, the machine tool is more durable, and meanwhile the comfort characteristic is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of control valves, and in particular to an agricultural implement lifting control valve and an intelligent control method. Background Art

[0002] With the rapid development of agriculture, tractor-driven agricultural farming has gradually replaced human and animal farming. The existing agricultural farming machinery is a traditional simple and single-functional agricultural farming tool. The efficiency of such agricultural farming tools in plowing, turning, threshing, leveling, sowing, fertilizing, and harvesting is relatively low. Each step of the operation depends on the operator controlling the operating lever in the cab, which consumes manpower and cannot be remotely controlled. As a result, more and more complex agricultural farming tools have been born, and the application of modern hydraulic electric control valves to control agricultural machinery has become more and more extensive. However, many hydraulic electric control valves have major defects in their structures, and the control speed and flow are particularly unsatisfactory. The conversion between lifting, stopping, maintaining pressure, descending, and pressing down will be very stiff, affecting the comfort and efficient farming. If the lifting, stopping, maintaining pressure, descending, and pressing down are not operated smoothly, it may also cause damage to the agricultural machinery. Summary of the invention

[0003] Based on the technical problems existing in the background technology, the present invention proposes an agricultural implement lifting control valve and an intelligent control method.

[0004] The present invention provides a lifting control valve for agricultural implements and an intelligent control method, comprising a pressure input module, a reversing valve module and a main control lifting module;

[0005] The pressure input module is used to release the pressure to the oil tank;

[0006] The reversing valve module includes two No. 1 reversing valve assemblies and a No. 2 reversing valve assembly, wherein the two No. 1 reversing valve assemblies are respectively used to control the adjustment drive member and the depth drive member, and the No. 2 reversing valve assembly is used to control the flipping drive member;

[0007] The main control lifting module is used to control the lifting cylinder to lift the soil turning component.

[0008] Preferably, the pressure input module comprises an oil inlet valve block, a normally open solenoid valve and a one-way relief valve; the normally open solenoid valve and the one-way relief valve are both installed on the oil inlet valve block, and the normally open solenoid valve is kept in a normally open state when the oil is in farming or standby mode, so as to release the pressure to the oil tank;

[0009] When the cylinder moves to its limit, the one-way relief valve opens to release the pressure to the tank.

[0010] Preferably, the maximum flow rate of the normally open solenoid valve is 113 L / min;

[0011] The maximum flow rate of the one-way relief valve is 95L / min.

[0012] Preferably, the reversing valve module further comprises a reversing valve block; the reversing valve block is fixedly mounted on one side of the oil inlet valve block, and the two reversing valve assemblies No. 1 and No. 2 are both fixedly mounted on the reversing valve block.

[0013] Preferably, the main control lifting module includes a main control reversing valve block, an electromagnetic switch valve, a normally closed electromagnetic valve, a throttle valve No. 1 and a throttle valve No. 2; the lifting valve assembly is fixedly installed on the main control reversing valve block, the main control reversing valve block is fixedly installed on the side of the reversing valve block away from the oil inlet valve block, and the electromagnetic switch valve, the normally closed electromagnetic valve, the throttle valve No. 1 and the throttle valve No. 2 are all fixedly installed on the main control reversing valve block.

[0014] Preferably, when the pressure oil passes through the valve core of the lifting valve assembly and flows to port A, it is divided into two paths. One path reaches the electromagnetic switch valve and can obtain a maximum flow rate of 85L / min after the electrical signal of the coil Y10 is turned on.

[0015] Preferably, the flow rate controlled by the No. 2 throttle valve is within a range of 8-50 L / min.

[0016] Preferably, the normally closed solenoid valve is equipped with a high-pressure stop valve.

[0017] An intelligent control method for a lifting control valve of an agricultural implement, the control steps are as follows:

[0018] S1. System initialization and pressure setting: Start the hydraulic system, adjust the system pressure to the preset value through the normally open solenoid valve and one-way relief valve of the pressure input module, and ensure that the pressure is released to the oil tank in the standby state;

[0019] S2. The main lifting module controls the lifting cylinder:

[0020] The oil inlet direction of the lifting cylinder is controlled by the on-off of the electromagnetic switch valve to drive the working part of the agricultural implement to descend or ascend;

[0021] Choose between fast or buffered mode depending on job requirements:

[0022] Fast mode: The coil Y10 electrical signal is triggered to open the electromagnetic switch valve, and the oil is quickly lifted and lowered through the A port of the main control reversing valve block at a maximum flow rate of 110L / min;

[0023] Buffer mode: close the electromagnetic switch valve, and the oil will adjust the flow rate to 8-50L / min through the No. 2 throttle valve to achieve lifting buffer;

[0024] S3. Directional valve module coordinates control of the drive:

[0025] Function 1 (reversal drive): Control the reversal drive through the No. 2 reversing valve assembly, switch the valve core to the Y-type function (ABT pass), drive the coulter to reverse and enter the floating tillage mode;

[0026] Function 2 (spacing adjustment): Control and adjust the drive component through the No. 1 reversing valve assembly, switch the valve core to the E-type function (ABPT is blocked), and adjust the plow blade spacing in combination with the one-way hydraulic lock and throttle valve;

[0027] Function 3 (depth control): Control the depth drive through another No. 1 reversing valve assembly, switch the valve core to the Y-type function (ABT pass), and dynamically adjust the coulter's soil penetration depth in combination with the two-way hydraulic lock and pressure sensor;

[0028] S4. Closed-loop feedback and unmanned operation:

[0029] The position sensor of the lift cylinder provides real-time feedback on the working height, automatically triggering the connection action of functions 1-3;

[0030] Integrated reverse gear recognition signal automatically triggers the lift cylinder to reset and prevent damage to the machine.

[0031] One-touch execution of multiple action sequences is achieved through the remote control module or autonomous driving system.

[0032] The agricultural implement lifting control valve and intelligent control method proposed by the present invention have the following beneficial effects: intelligent control, the main control lifting module has fast and slow speed conversion, the speed can be adjusted by the descent speed knob, and it switches from fast descent to slow descent when descending. It has a buffering function and will not cause severe shaking of the implement due to sudden stop during fast descent. It has a protective effect on the machine and can be more durable, and it also has comfort characteristics.

[0033] The present invention can realize automatic control. By identifying the position, the main control lifting module can realize precise control of the rising and falling positions, and repeatedly set the position at a set position without relying on manual control, thereby greatly improving the working efficiency and saving time and labor.

[0034] The present invention can realize remote control and unmanned control. After the present invention is electrified, remote control can be realized. The operator can control it by operating the remote control, and can operate on a specific plot of land, providing the prerequisite for smart agricultural automatic driving farming.

[0035] The bidirectional pressure-maintaining function of the main control lifting module of the present invention is a power-off pressure-maintaining function, which can maintain the pressure of agricultural machinery at any position, keep the position of the machinery unchanged, and keep the depth of the agricultural machinery buried in the soil highly consistent.

[0036] The main control lifting module of the present invention has a floating design. Only by closing the strong pressure knob can the rod chamber of the lifter cylinder 7 be connected to the return oil of the hydraulic oil circuit, so as to realize the floating and soil cultivation mode after free falling by its own weight.

[0037] The main reversing valve of the main control lifting module and the reversing valve of the reversing valve module of the present invention can control the valve core diameter up to φ18 and is equipped with a larger threaded magnetic sleeve of M27*1.5, so that the valve core can enable the lifting cylinder 7 to obtain a larger flow, making the rising and falling speed faster and more efficient.

[0038] The present invention has other electronically controlled spare output modules that can realize one-to-one control of other functions of agricultural machinery. It adopts a chip-type structure design, can be flexibly stacked, and can be increased or decreased. If two spare outputs are needed, only two spare output valves need to be installed (this application uses four spare outputs as an example).

[0039] The present invention has a pressure input module, and a reliable electric control valve can release pressure to the oil tank when farming or on standby, so that the oil pump will not work due to overflow, saving fuel consumption. The present invention is equipped with a pressure regulating valve for flexible pressure adjustment, and it also acts as a safety valve to overflow when the pressure reaches the set value, making the system work more safely. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A diagram of an agricultural implement to which the agricultural implement lifting control valve proposed by the present invention is applied.

[0041] Figure 2 The present invention is a top view of an agricultural implement lifting control valve.

[0042] Figure 3 The present invention is a left side view of a lifting control valve for an agricultural implement.

[0043] Figure 4 The present invention is a right side view of a lifting control valve for an agricultural implement.

[0044] Figure 5 A rear view of a lifting control valve for an agricultural implement proposed by the present invention;

[0045] Figure 6 A lifting control valve for agricultural implements proposed by the present invention Figure 5 Sectional view at AA;

[0046] Figure 7 A lifting control valve for agricultural implements proposed by the present invention Figure 5 Sectional view at the middle BB;

[0047] Figure 8 A lifting control valve for agricultural implements proposed by the present invention Figure 5 Sectional view at CC;

[0048] Fig. 9 A front view of a lifting control valve for an agricultural implement provided by the present invention;

[0049] Fig.10 A working principle diagram of a lifting control valve for agricultural implements proposed by the present invention;

[0050] Fig.11 The present invention provides a circuit logic control diagram of a lifting control valve for an agricultural implement.

[0051] In the figure: 1. tractor head; 2. tractor cab; 3. tractor hydraulic operating lever; 4. control button; 5. tail control button; 6. agricultural implement lifting control valve; 7. lifting cylinder; 8. flip drive; 9. adjustment drive; 10. plow; 11. depth drive; 12. tug; 13. oil inlet valve block; 14. normally open solenoid valve; 15. one-way relief valve; 16. reversing valve block; 17. No. 1 reversing valve assembly; 18. No. 2 reversing valve assembly; 19. lifting valve assembly; 20. main control reversing valve block; 21. solenoid switch valve; 22. normally closed solenoid valve; 23. No. 1 throttle valve; 24. No. 2 throttle valve. DETAILED DESCRIPTION

[0052] Reference Figure 1-Figure 11 The present invention proposes a lifting control valve for agricultural implements and an intelligent control method, including a pressure input module, a reversing valve module and a main control lifting module. The pressure input module is used to release the pressure to the oil tank. The reversing valve module includes two No. 1 reversing valve assemblies 17 and a No. 2 reversing valve assembly 18. The two No. 1 reversing valve assemblies 17 are used to control the adjustment drive 9 and the depth drive 11 respectively. The No. 2 reversing valve assembly 18 is used to control the turning drive 8. The main control lifting module is used to control the lifting cylinder 7 to lift the turning assembly.

[0053] like Figure 1As shown in the figure, the current agricultural implements include a tractor head 1, a tractor cab 2, a tractor hydraulic operating lever 3, a control button 4, a tail control button 5, an agricultural implement lifting control valve 6, a lifting cylinder 7, a flip drive 8 (function 1), an adjustment drive 9 (function 2), a plow 10, a depth drive 11 (function 3) and a tug 12. The lifting cylinder 7 is used to lift or lower the entire working part of the plow 10 to perform various operations (the working part includes the adjustment drive 9, the plow 10, the depth drive 11 and the tug 12 and other components), the flip drive 8 is used to lift or lower the plow The entire working part of the plow 10 is flipped to control the contact between the plow 10 and the ground, and the spacing between each plow 10 is adjusted by adjusting the driving member 9 (adjusting the spacing can adapt to different soil textures: in clay or hard soil, appropriately increasing the plow spacing can reduce mutual interference between plows, reduce resistance, and improve working efficiency; meet different crop planting requirements: according to the row spacing and planting density of different crops, adjusting the plow spacing can achieve precise cultivation and avoid damage to the crop root system; precise spacing adjustment can ensure that the plow runs smoothly during operation and reduce failures caused by improper spacing, etc.), by deep The driving member 11 drives the tilting angle between the tugboat 12 bracket and the mounting frame of the coulter 10, and the height between the mounting frame of the coulter 10 and the ground changes, thereby controlling the tillage depth of the coulter 10 (by adjusting the tillage depth, the operation can be completed at one time according to different soil conditions and crop requirements, avoiding the problem of repeated tillage due to insufficient depth in the traditional method, thereby saving time and labor, and being able to better adapt to different terrains and soil conditions; deeper tillage can deeply bury pests and weed seeds in the soil, reduce the breeding of pests and diseases and the growth of weeds, and deep plowing can improve the ecological environment of the soil and reduce pathogens The survival rate of bacteria and pests can be reduced; through deep plowing, the straw can be buried deep in the soil, which accelerates the decomposition of the straw and increases the content of soil organic matter, thereby improving soil fertility. Deep plowing can mix the upper and lower layers of soil, making the soil nutrient distribution more uniform, which is conducive to the growth of crops; plows equipped with adjustable plowing depth can quickly adjust the plowing depth according to different operation requirements, reducing the time wasted due to equipment replacement. Reasonable plowing depth adjustment can reduce the excessive load of the plow during operation and extend the service life of the equipment. ), the tug 12 is supported on the bottom surface, thereby ensuring the stability of the entire plow blade 10 during operation.

[0054] When the operation is carried out, the height, speed, descent pressure, depth and function 1, function 2 and function 3 of the lifter are controlled by the electric control valve at the same time. The lifting height, the descent height, function 1, function 2 and function 3 can be set by detecting the position of the lifter cylinder 7. Therefore, it is very easy for the operator to control. After setting various functions, the control button 4 is used to control multiple cylinders. Function 1, function 2 and function 3 can be operated with one key. The connection between fast and slow speeds is also very smooth, and there will be no violent shaking of the farm implement caused by the sudden stop of rising and falling. With the electric control design, many new functions can be added.

[0055] For example, after recognizing that the reverse gear is engaged, the lifter can be automatically raised to prevent the pear knife 10 from being crushed by the reverse gear;

[0056] For example, a tail control button 5 can be installed at the rear of the vehicle to facilitate the user's control;

[0057] For example: it also provides the possibility for unmanned farming.

[0058] It should be noted that the adjustment drive member 9 , the depth drive member 11 and the flip drive member 8 are all hydraulic cylinders.

[0059] The agricultural implement lifting control valve 6 includes a pressure input module, a reversing valve module and a main control lifting valve module. The pressure input module includes an oil inlet valve block 13, a normally open solenoid valve 14 and a one-way relief valve 15; the normally open solenoid valve 14 and the one-way relief valve 15 are both installed on the oil inlet valve block 13. The P of the pressure input module is connected to the hydraulic power output end, and an M22*1.5 threaded connection is used to ensure sufficient flow supply; T is connected to the hydraulic return oil filter inlet tank, and an M22*1.5 threaded connection is used to ensure sufficient flow supply; M is connected to the hydraulic power output end, and the pressure value is measured during debugging; The maximum flow rate of the normally open solenoid valve 14 can reach 113L / min. When tilling or on standby, this valve remains in a normally open state, and the pressure is released to the oil tank. The oil pump will not work due to overflow, which saves fuel consumption. It is equipped with a pressure regulating valve for flexible pressure adjustment, and it overflows as a safety valve when the pressure reaches the set value, making the system safer to work; when tilling or on standby, the electronically controlled valve can release the pressure to the oil tank, and the oil pump will not work due to overflow, which saves fuel consumption. It is equipped with a pressure regulating valve for flexible pressure adjustment, and it overflows as a safety valve when the pressure reaches the set value, making the system safer to work.

[0060] The maximum flow rate of the one-way relief valve 15 is 95L / min. When the oil cylinder moves to the limit and the pressure reaches the set pressure of 200bar, this valve opens to release the pressure to the oil tank. The valve is a direct-acting relief valve with fast response and low heat generation. It also has a one-way function, which can effectively prevent the system from being pressurized due to incorrect oil pipe connection, thereby protecting the system. When the oil cylinder moves to the limit, the one-way relief valve 15 opens to release the pressure to the oil tank.

[0061] The reversing valve module also includes a reversing valve block 16; the reversing valve block 16 is fixedly installed on one side of the oil inlet valve block 13, and the two No. 1 reversing valve assemblies 17 and No. 2 reversing valve assemblies 18 are fixedly installed on the reversing valve block 16; the pressure oil introduces the oil inlet from the P port into the lower waist-shaped long hole through the reversing valve block 16, and the flow rate can reach 90L / min, and enters the reversing valve core through the waist-shaped hole. The reversing valve core is a sliding valve structure, and two commonly used intermediate position functions are designed (function Y, that is, ABT is open, P is not open; function E, that is, ABPT is not open). The reversing control valve drives the magnetic sleeve to drive the valve core to move through the coil energized. The valve core has a diameter of up to φ18 and is equipped with a larger threaded magnetic sleeve of M27*1.5, so that the valve can obtain a larger flow; a hydraulic lock position is designed after the reversing valve, and different reversing requirements can be met by installing different plug-ins. The functions are as follows:

[0062] Function 1. The valve core of the No. 1 reversing valve assembly 17 adopts a Y-type function, and the hydraulic lock adopts a bidirectional hydraulic lock, which can realize the bidirectional pressure maintenance of the cylinder and keep the cylinder action unchanged, so that the heavier machine tools can be transported for a long time or need to remain motionless;

[0063] Function 2: The valve core of the No. 2 reversing valve 18 uses the E-type function, and the hydraulic lock uses a one-way lock. The one-way throttle valve cooperates to achieve one-way pressure maintenance of the cylinder, keep the cylinder action unchanged for a short time, and control the cylinder movement speed by adjusting the throttle valve;

[0064] Function 3: The valve core of another No. 1 reversing valve assembly 17 uses a Y-type function, and the hydraulic lock selects a throttle valve with a one-way lock to control the movement of a single-acting cylinder, that is, when there is pressure at port A, the machine is pushed up, and when there is no pressure at port A, the machine descends by its own weight, and the descending speed can be adjusted by the throttle valve.

[0065] The main control lifting module includes a main control reversing valve block 20, an electromagnetic switch valve 21, a normally closed electromagnetic valve 22, a No. 1 throttle valve 23 and a No. 2 throttle valve 24; the lifting valve assembly 19 is fixedly installed on the main control reversing valve block 20, the main control reversing valve block 20 is fixedly installed on the side of the reversing valve block 16 away from the oil inlet valve block 13, and the electromagnetic switch valve 21, the normally closed electromagnetic valve 22, the No. 1 throttle valve 23 and the No. 2 throttle valve 24 are all fixedly installed on the main control reversing valve block 20; the pressure oil introduces the P port oil into the lower waist-shaped long hole through the reversing valve block 16, and the flow rate can reach 90L / min, and enters the valve core of the lifting valve assembly 19 through the waist-shaped hole. The valve core of the lifting valve assembly 19 is a sliding valve structure, and two commonly used intermediate position functions are designed (function Y, that is, ABT is open, P is not open; function E, that is, ABPT is not connected) The lifting valve assembly 19 drives the magnetic sleeve to drive the valve core to move through the coil. The diameter of the valve core can reach φ18 and is equipped with a larger threaded magnetic sleeve of M27*1.5, so that this valve can obtain a larger flow rate; when the pressure oil passes through the valve core of the lifting valve assembly 19 and leads to the A port, it is divided into two paths. One path reaches the electromagnetic switch valve 21 and can obtain a larger flow rate of 85L / min after the coil Y10 electrical signal is turned on. The other path of oil passes through the No. 2 throttle valve 24. When the electromagnetic switch valve 21 coil Y10 has no electrical signal and is in the closed state, the oil is completely controlled by the No. 2 throttle valve 24. The adjustment range is 8-50L / min. When the electromagnetic switch valve 21 can be opened by the coil Y10 electrical signal, the throttle valve is also fully opened. At this time, the maximum flow rate of 110L / min can be obtained;

[0066] A1 and B1 ports of the main control lifting valve are each equipped with a normally closed solenoid valve 22. When there is no electrical signal, it is in a closed state. Due to the powerful pressure-maintaining function of the valve, a heavy machine can be kept motionless for a long time. When an electrical signal is received, the valve is in an open state, and the movement position of the machine can be adjusted.

[0067] The normally closed solenoid valve 22 is equipped with a strong pressure stop valve. When the valve is closed, it means that the strong pressure is turned on, and the machine can be controlled to force the machine to press against the land or cultivated crops without leakage. When the valve is opened, it means that the strong pressure is turned off. When the lifting control valve is pressed downward, the valve will release most of the flow 0-50L / min to the oil tank. There is no force when forcibly pressing against the land or cultivated crops. Instead, the machine will rise and fall according to the waves of the land, thereby realizing floating cultivation of the machine. In summary, there are three factors that affect the A flow, which are:

[0068] 1. The opening size of the No. 1 throttle valve 23 of the high-pressure valve;

[0069] 2. The opening size of the No. 2 throttle valve 24 of the descending valve;

[0070] 3. Check whether the electrical signal of coil Y10 of electromagnetic switch valve 21 is energized.

[0071] like Figure 1-11 As shown in , the control steps are as follows:

[0072] S1. System initialization and pressure setting: Start the hydraulic system, adjust the system pressure to the preset value through the normally open solenoid valve 14 and the one-way relief valve 15 of the pressure input module, and ensure that the pressure is released to the oil tank in the standby state;

[0073] S2. The main lifting module controls the lifting cylinder 7:

[0074] The oil inlet direction of the lifter oil cylinder 7 is controlled by the on-off of the electromagnetic switch valve 21 to drive the working part of the agricultural implement to descend or ascend;

[0075] Choose between fast or buffered mode depending on job requirements:

[0076] Fast mode: The electrical signal of coil Y10 is triggered to open the electromagnetic switch valve 21, and the oil is quickly lifted and lowered through port A of the main control reversing valve block 20 at a maximum flow rate of 110L / min;

[0077] Buffer mode: close the electromagnetic switch valve 21, and adjust the oil flow to 8-50L / min through the No. 2 throttle valve 24 to achieve lifting buffer;

[0078] S3. Directional valve module coordinates control of the drive:

[0079] Function 1 (reversal drive): The reversal drive element 8 is controlled by the second reversing valve assembly 18, the valve core is switched to the Y-type function (ABT pass), the plow blade 10 is driven to reverse and enter the floating tillage mode;

[0080] Function 2 (spacing adjustment): Control and adjust the drive member 9 through the No. 1 reversing valve assembly 17, switch the valve core to the E-type function ABPT is blocked, and adjust the spacing of the coulters 10 in combination with the one-way hydraulic lock and the throttle valve;

[0081] Function 3 (depth control): control the depth drive 11 through another No. 1 reversing valve assembly 17, switch the valve core to the Y-type function (ABT pass), and dynamically adjust the soil penetration depth of the coulter 10 in combination with the two-way hydraulic lock and the pressure sensor;

[0082] S4. Closed-loop feedback and unmanned operation:

[0083] The position sensor of the lift cylinder 7 provides real-time feedback of the working height, automatically triggering the connection action of functions 1-3;

[0084] Integrated reverse gear recognition signal automatically triggers the lifting cylinder 7 to reset to prevent damage to the machine;

[0085] One-touch execution of multiple action sequences is achieved through the remote control module or autonomous driving system.

[0086] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A lifting control valve for agricultural implements, characterized in that: It includes a pressure input module, a reversing valve module and a main control lifting module; The pressure input module is used to release the pressure to the oil tank; The reversing valve module comprises two first reversing valve assemblies (17) and a second reversing valve assembly (18), wherein the two first reversing valve assemblies (17) are respectively used to control the adjustment drive member (9) and the depth drive member (11), and the second reversing valve assembly (18) is used to control the flip drive member (8); The main control lifting module is used to control the lifting cylinder (7) to lift the soil turning component.

2. The agricultural implement lifting control valve according to claim 1, characterized in that: The pressure input module comprises an oil inlet valve block (13), a normally open solenoid valve (14) and a one-way relief valve (15); the normally open solenoid valve (14) and the one-way relief valve (15) are both installed on the oil inlet valve block (13); when the normally open solenoid valve (14) is in farming or standby mode, the normally open solenoid valve (14) remains in a normally open state, and is used to release pressure to the oil tank; When the oil cylinder moves to the limit, the one-way relief valve (15) opens to release the pressure to the oil tank.

3. The agricultural implement lifting control valve according to claim 2, characterized in that: The maximum flow rate of the normally open solenoid valve (14) is 113 L / min; The maximum flow rate of the one-way overflow valve (15) is 95 L / min.

4. The agricultural implement lifting control valve according to claim 1, characterized in that: The reversing valve module further comprises a reversing valve block (16); the reversing valve block (16) is fixedly mounted on one side of the oil inlet valve block (13); and the two reversing valve assemblies No. 1 (17) and No. 2 (18) are both fixedly mounted on the reversing valve block (16).

5. The agricultural implement lifting control valve according to claim 1, characterized in that: The main control lifting module comprises a main control reversing valve block (20), an electromagnetic switch valve (21), a normally closed electromagnetic valve (22), a first throttle valve (23) and a second throttle valve (24); the lifting valve assembly (19) is fixedly mounted on the main control reversing valve block (20); the main control reversing valve block (20) is fixedly mounted on a side of the reversing valve block (16) away from the oil inlet valve block (13); the electromagnetic switch valve (21), the normally closed electromagnetic valve (22), the first throttle valve (23) and the second throttle valve (24) are all fixedly mounted on the main control reversing valve block (20).

6. The agricultural implement lifting control valve according to claim 5, characterized in that: When the pressure oil passes through the valve core of the lifting valve assembly (19) and flows to port A, it is divided into two paths. One path reaches the electromagnetic switch valve (21) and can obtain a maximum flow rate of 85L / min after the coil Y10 electrical signal is turned on.

7. The agricultural implement lifting control valve according to claim 6, characterized in that: The second throttle valve (24) controls the flow rate within a range of 8-50 L / min.

8. The agricultural implement lifting control valve according to claim 5, characterized in that: The normally closed electromagnetic valve (22) is equipped with a strong pressure stop valve.

9. An intelligent control method for a lifting control valve of an agricultural implement, using the lifting control valve of an agricultural implement according to any one of claims 1 to 8, characterized in that: The control steps are as follows: S1. System initialization and pressure setting: Start the hydraulic system, adjust the system pressure to the preset value through the normally open solenoid valve (14) and the one-way relief valve (15) of the pressure input module, and ensure that the pressure is released to the oil tank in the standby state; S2. The main lifting module controls the lifting cylinder (7): The oil inlet direction of the lifting cylinder (7) is controlled by turning on and off the electromagnetic switch valve (21) to drive the working part of the agricultural implement to descend or ascend; Choose between fast or buffered mode depending on job requirements: Fast mode: The electrical signal of coil Y10 is triggered to open the electromagnetic switch valve (21), and the oil flows through port A of the main control reversing valve block (20) to perform rapid lifting and lowering at a maximum flow rate of 110L / min; Buffering mode: the electromagnetic switch valve (21) is closed, and the oil flow is adjusted to 8-50L / min through the second throttle valve (24) to achieve lifting buffering; S3. Directional valve module coordinates control of the drive: Function 1 (reversal drive): the reversal drive member (8) is controlled by the second reversing valve assembly (18), the valve core is switched to the Y-type function (ABT pass), the plow blade (10) is driven to reverse and enter the floating tillage mode; Function 2 (spacing adjustment): Control the adjustment drive (9) through the No. 1 reversing valve assembly (17), switch the valve core to the E-type function (ABPT is blocked), and adjust the spacing of the coulters (10) in combination with the one-way hydraulic lock and the throttle valve; Function 3 (depth control): Control the depth drive (11) through another No. 1 reversing valve assembly (17), switch the valve core to the Y-type function (ABT pass), and dynamically adjust the soil penetration depth of the coulter (10) in combination with the two-way hydraulic lock and the pressure sensor; S4. Closed-loop feedback and unmanned operation: The position sensor of the lifter oil cylinder (7) provides real-time feedback of the working height, automatically triggering the connection action of functions 1-3; The integrated reverse gear recognition signal automatically triggers the lifting cylinder (7) to reset, thus preventing damage to the machine. One-touch execution of multiple action sequences is achieved through the remote control module or autonomous driving system.

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