A comprehensive control system and method for the plowing depth on both sides of an agricultural tractor

Abstract

The present invention provides a comprehensive control system and method for the plowing depth on both sides of an agricultural tractor. The system includes a connecting oil circuit unit and a pair of plowing depth cylinders. The rodless chambers of the two plowing depth cylinders are connected through a first oil circuit. A two-position three-way electromagnetic directional control valve is used to switch the drive oil circuits of the plowing depth cylinders and the side plow cylinders. Its third oil port is connected to a second oil circuit between a check valve and a rear proportional speed control valve. Its first oil port is connected to the rodless chamber of the side plow cylinder, and its second oil port is connected to the first oil circuit between the two plowing depth cylinders. A first two-position two-way electromagnetic directional control valve is used to return the oil in the rod chamber of the side plow cylinder to the T1 port when the side plow cylinder rises. One passage of the first two-position two-way electromagnetic directional control valve is connected between the rod chamber of the side plow cylinder and the T1 port. The present invention realizes the height control of the two side plows through the combination of hydraulic valves, making full use of the two existing proportional speed control valves in the current industry application, rather than through the relatively common and cumbersome method of increasing the combination of proportional speed control valves and electromagnetic directional control valves.

Description

Technical Field

[0001] The present invention belongs to the technical field of agricultural plow height control, and particularly relates to a comprehensive control system and method for the plowing depth on both sides of an agricultural tractor. Background Art

[0002] In the prior art, in an agricultural tractor, the left and right plows are simultaneously lifted and lowered by an oil cylinder. However, in actual tillage, there are sometimes certain deviations in the heights of the left and right plows, resulting in uneven plowing depths. The more uneven the ground is, the more obvious this situation becomes. Summary of the Invention

[0003] The purpose of the present invention is to provide a comprehensive control system and method for the plowing depth on both sides of an agricultural tractor. Through the combination of hydraulic valves, the two inherent proportional speed control valves in the current industry application are fully utilized, rather than through the relatively common and cumbersome method of adding a combination of a proportional speed control valve and an electromagnetic directional control valve, to achieve the height control of the plows on both sides. To achieve the above purpose, the present invention adopts the following technical solutions:

[0004] A comprehensive control system for the plowing depth on both sides of an agricultural tractor includes:

[0005] A connecting oil circuit unit, whose input end forms a P port and whose output end forms a T port; the connecting oil circuit unit includes a check valve and a rear proportional speed control valve, and the check valve conducts from the P port to the rear proportional speed control valve;

[0006] A pair of plowing depth oil cylinders, and the rodless cavities of the two plowing depth oil cylinders are connected through a first oil circuit;

[0007] A two-position three-way electromagnetic directional control valve for switching the driving oil circuits of the plowing depth oil cylinder and the side plow oil cylinder. Its third oil port is connected to a second oil circuit between the check valve and the rear proportional speed control valve, its first oil port is connected to the rodless cavity of the side plow oil cylinder, and its second oil port is connected to the first oil circuit between the two plowing depth oil cylinders;

[0008] A first two-position two-way electromagnetic directional control valve, when the side plow oil cylinder rises, the oil in its rod cavity returns to the T1 port, and one passage of the first two-position two-way electromagnetic directional control valve is connected between the rod cavity of the side plow oil cylinder and the T1 port.

[0009] Preferably, it further includes a second two-position two-way electromagnetic directional control valve for blocking the oil between the P port and the rod cavity of the side plow oil cylinder; the second two-position two-way electromagnetic directional control valve is arranged between the P port and the first two-position two-way electromagnetic directional control valve. When the side plow oil cylinder needs to descend, the second two-position two-way electromagnetic directional control valve is energized and conducts, and the first two-position two-way electromagnetic directional control valve is energized and cut off, and the oil flows from the P port through the second two-position two-way electromagnetic directional control valve into the rod cavity of the side plow oil cylinder.

[0010] Preferably, the connecting oil circuit unit further includes a front proportional speed control valve, which is arranged between the P port and the check valve and is conductive when powered on.

[0011] Preferably, the connecting oil circuit unit further includes a pressure compensation valve, one oil port of which is connected to the T port and the other oil port is connected to the P port.

[0012] Preferably, the cylinder block of the side plow cylinder is hinged to the front section of the tail of the plow frame, and its piston rod is hinged to the rear section of the tail of the plow frame. The front section and the rear section are connected by the side plow cylinder.

[0013] Preferably, the rear section of the tail of the plow frame includes a first rear section and a second rear section, which are hinged to each other.

[0014] Preferably, a plow body is arranged on the bottom surface of the tail of the plow frame.

[0015] Preferably, a horizontal sensor is arranged on the plow frame.

[0016] A control method for the plowing depth on both sides of an agricultural tractor includes:

[0017] The side plow cylinder rises: The two-position three-way electromagnetic directional valve is powered on, its third oil port communicates with its first oil port, hydraulic oil enters the connecting oil circuit unit through the P port, and the hydraulic oil enters the rodless cavity of the side plow cylinder through the third oil port and the first oil port, and the oil in it pushes the piston rod of the side plow cylinder to move upward;

[0018] The side plow cylinder returns oil when rising: The hydraulic oil in the rod chamber of the side plow cylinder flows into the two-position two-way electromagnetic directional valve one when it is de-energized and returns to the fuel tank through the T1 port;

[0019] The side plow cylinder descends: The two-position three-way electromagnetic directional valve, the two-position two-way electromagnetic directional valve two, and the two-position two-way electromagnetic directional valve one are all powered on. Hydraulic oil enters the connecting oil circuit unit from the P port, and successively passes through the two-position two-way electromagnetic directional valve two and the two-position two-way electromagnetic directional valve one, and then enters the rod chamber of the side plow cylinder;

[0020] The side plow cylinder returns oil when descending: The hydraulic oil in the rodless cavity of the side plow cylinder flows through the third oil port of the two-position three-way electromagnetic directional valve through the first oil port, then enters the rear proportional speed control valve, and returns to the fuel tank through the T port.

[0021] Preferably, it further includes:

[0022] The plowing depth cylinder rises: The two-position three-way electromagnetic directional valve is de-energized, its third oil port communicates with its second oil port, hydraulic oil enters the connecting oil circuit unit through the P port, and the hydraulic oil enters the rodless cavity of the plowing depth cylinder through the third oil port and the second oil port, and the oil in it pushes the piston rod of the plowing depth cylinder to move upward;

[0023] The plowing depth cylinder returns oil by its own weight: The hydraulic oil in the rodless cavity of the plowing depth cylinder flows through the second oil port, the third oil port of the two-position three-way electromagnetic directional control valve, and finally enters the rear proportional speed control valve, and then flows back to the fuel tank through the T port.

[0024] Compared with the prior art, the advantages of the present invention are as follows: The present invention adopts a combination of a side plow cylinder and a hydraulic valve, and at the same time, with the help of the proportional valve of the original system and by adding a horizontal sensor, the height control of the two side plows is realized, and the control is simple, the cost is low, and the space occupied is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is the hydraulic schematic diagram of the lifting of the plowing depth cylinder in the prior art;

[0026] Figure 2 is the hydraulic schematic diagram of the comprehensive control system for the plowing depths on both sides of an agricultural tractor;

[0027] Figure 3 is the connection relationship diagram of the agricultural tractor and the plow frame;

[0028] Figure 4 is the side view of the plow frame;

[0029] Figure 5 is the top view of the plow frame;

[0030] Figure 6 is Figure 5 the enlarged sectional view of the connection at position I in

[0031] Figure 7 is Figure 5 the enlarged sectional view of the connection at position II in

[0032] Among them, 1 - front proportional speed control valve; 2 - pressure compensation valve; 3 - throttle piece; 4 - rear proportional speed control valve; 5 - check valve; 6 - two-position three-way electromagnetic directional control valve; 7 - two-position two-way electromagnetic directional control valve II; 8 - two-position two-way electromagnetic directional control valve I; 9 - first plowing depth cylinder; 10 - second plowing depth cylinder; 11 - side plow cylinder; 12 - plow frame, 121 - front section, 122 - rear section, 13 - plow, 14 - cylinder fixing bracket, 15 - first rib plate, 16 - horizontal sensor, 17 - second rib plate, 18 - third rib plate, 19 - fourth rib plate, 20 - first hinge shaft, 21 - connecting pin, 22 - fuselage, 23 - second hinge shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The present invention will be described in more detail below with reference to the schematic diagrams, in which the preferred embodiments of the present invention are shown. It should be understood that those skilled in the art can modify the present invention described herein while still achieving the advantageous effects of the present invention. Therefore, the following description should be understood as a broad guidance for those skilled in the art and not as a limitation to the present invention.

[0034] As shown Figures 1-7 in the figure, an integrated control system for plowing depth on both sides of an agricultural tractor includes: a connecting oil circuit unit (prior art), a pair of plowing depth cylinders (a first plowing depth cylinder 9 and a second plowing depth cylinder 10), a two-position three-way electromagnetic directional control valve 6, a two-position two-way electromagnetic directional control valve two 7, and a two-position two-way electromagnetic directional control valve one 8.

[0035] The connecting oil circuit unit (prior art, such as Figure 1 ), its input end forms a P port, and its output end forms a T port; the connecting oil circuit unit includes a check valve and a rear proportional speed control valve, and the check valve conducts from the P port to the rear proportional speed control valve. As is known from the prior art: the connecting oil circuit unit further includes a front proportional speed control valve and a pressure compensation valve. The front proportional speed control valve is arranged between the P port and the check valve and conducts when powered on. One oil port of the pressure compensation valve is connected to the T port, and the other oil port is connected to the P port. Figure 1 In this case, hydraulic oil enters the system from the P port, passes through the front proportional speed control valve 1 and the check valve 5, enters the A port, connects to the rodless cavity of the plowing depth cylinder 11, and pushes the cylinder to rise. The front proportional speed control valve 1 can achieve stepless speed regulation for the rising action. The throttle piece 3 buffers the impact of the pressure sensing port (and ensures the pressure difference), and the pressure compensation valve 2 ensures that the pressure difference before and after the front proportional speed control valve 1 is constant and not affected by the load, so that the output flow of the front proportional speed control valve 1 is constant. When the cylinder descends, the hydraulic oil returns from the rodless cavity to the A port, passes through the rear proportional speed control valve 4 for return oil proportional speed regulation, and finally returns to the fuel tank through the T port. In this way, proportional control of the cylinder lifting and lowering is achieved. To sum up, it can be seen that when the cylinder rises, the pressure compensation valve 2 performs pressure compensation. When the cylinder descends, there is no pressure compensation; the descent uses return oil speed regulation control.

[0036] In this embodiment, by using 1 two-position three-way electromagnetic directional control valve 6 connected in series in the oil circuit, making full use of the original front proportional speed control valve 1 and rear proportional speed control valve 4, proportional control of the rising and falling of the side plow cylinder 11 is achieved, and pressure compensation is available during rising (no pressure compensation during falling).

[0037] A pair of plowing depth cylinders, and the rodless cavities of the two plowing depth cylinders are connected through a first oil circuit.

[0038] The two-position three-way electromagnetic directional control valve 6 is used to switch the drive oil circuits of the plowing depth cylinder and the side plow cylinder 11. Its third oil port is connected to the second oil circuit between the check valve 5 and the rear proportional speed control valve 4. Its first oil port is connected to the rodless cavity of the side plow cylinder 11, and its second oil port is connected to the first oil circuit between the two plowing depth cylinders.

[0039] The two-position two-way electromagnetic directional control valve one 8 is used to return the oil in the rod chamber to the T1 port when the side plow cylinder 11 rises. One passage of the two-position two-way electromagnetic directional control valve one 8 is connected between the rod chamber of the side plow cylinder 11 and the T1 port. As Figure 2As shown, at this time, the side plow cylinder 11 is in the rising state, the two-position two-way electromagnetic directional valve 8 loses power, and one passage makes the two-position two-way electromagnetic directional valve 8 conduct.

[0040] The two-position two-way electromagnetic directional valve 7 is used to cut off the oil between the P port and the rod chamber of the side plow cylinder 11; the two-position two-way electromagnetic directional valve 7 is arranged between the P port and the two-position two-way electromagnetic directional valve 8. When the side plow cylinder 11 needs to descend, the two-position two-way electromagnetic directional valve 7 is energized and conducts, and the two-position two-way electromagnetic directional valve 8 is energized and cut off, and the oil flows from the P port through the two-position two-way electromagnetic directional valve 7 into the rod chamber of the side plow cylinder 11. As Figure 2 shown, at this time, the two-position two-way electromagnetic directional valve 7 loses power and does not conduct, and the two-position two-way electromagnetic directional valve 8 loses power and conducts.

[0041] Among them, the additional two-position two-way electromagnetic directional valve 8 and the two-position two-way electromagnetic directional valve 7 are used for the isolation between the plowing depth cylinder and the side plow cylinder 11 and the lifting of the side plow cylinder 11. It can also isolate the hydraulic system (connecting oil circuit unit) from the oil of the side plow cylinder 11 to prevent misoperation caused by oil leakage. Specifically, when the plowing depth cylinder is in the rising state, the hydraulic oil at the P port flows into the rodless chamber of the plowing depth cylinder, and the hydraulic oil at the P port will not flow into the side plow cylinder 11 through the two-position two-way electromagnetic directional valve 7 (the two-position two-way electromagnetic directional valve 7 loses power and cuts off its own oil circuit). Therefore, the two-position two-way electromagnetic directional valve 7 is used for the isolation between the plowing depth cylinder and the side plow cylinder 11, and can also isolate the hydraulic system (connecting oil circuit unit) from the oil of the side plow cylinder 11 to prevent misoperation caused by oil leakage.

[0042] The cylinder body of the side plow cylinder 11 is hinged to the front section 121 (the cylinder fixed bracket 14 thereon) at the tail of the plow frame 12 through the first hinge shaft 20, and its piston rod is hinged to the rear section 122 at the tail of the plow frame 12 through the first hinge shaft 20. The front section 121 and the rear section 122 are connected by the side plow cylinder 11. A horizontal sensor 16 is arranged on the plow frame 12. The first hinge shaft 20 is fixed to the plow frame 12. Specifically, when the horizontal sensor 16 senses that the plow frame 12 is inclined, such as when the left side of the plow frame 12 is lower, the side plow cylinder 11 rises in a timely manner to raise the left plow; when the horizontal sensor 16 senses that the left side of the plow frame is higher, the side plow cylinder 11 descends in a timely manner to lower the left plow. The same applies to the right plow frame. Above, the control unit sends a control signal to the solenoid valve to drive the side plow cylinder 11 to lift and move in the direction of reducing the inclination angle between the plow frame 13 and the ground. When the inclination angle is less than the allowable value, the cylinder drive is stopped.

[0043] Furthermore, the rear section 122 of the tail of the plow frame 12 includes a first rear section 122 and a second rear section 122, and the first rear section 122 and the second rear section 122 are hinged through a connecting pin 21 and a second hinge shaft 23. The second hinge shaft 23 is fixed to the plow frame 12.

[0044] As shown Figure 3 in the figure, it is known from the prior art that the body of the plow 13 is provided on the bottom surface of the tail of the plow frame 12, and the fuselage 22 is connected to the plow frame 12.

[0045] Working principle of the integrated control system for plowing depth on both sides of an agricultural tractor:

[0046] When the side plow cylinder 11 rises: The two-position three-way electromagnetic reversing valve 6 is energized, its third oil port communicates with its first oil port, hydraulic oil enters the connecting oil circuit unit through the P port, and the hydraulic oil enters the rodless cavity of the side plow cylinder 11 through the third oil port and the first oil port, and the oil in it pushes the piston rod of the side plow cylinder 11 to move upward.

[0047] When the side plow cylinder 11 returns oil during rising: The hydraulic oil in the rod cavity of the side plow cylinder 11 flows into the normally closed two-position two-way electromagnetic reversing valve 8 and returns to the fuel tank through the T1 port.

[0048] When the side plow cylinder 11 descends: The two-position three-way electromagnetic reversing valve 6, the two-position two-way electromagnetic reversing valve 7, and the two-position two-way electromagnetic reversing valve 8 are all energized, and the hydraulic oil enters the connecting oil circuit unit from the P port, and successively passes through the two-position two-way electromagnetic reversing valve 7 and the two-position two-way electromagnetic reversing valve 8, and then enters the rod cavity of the side plow cylinder 11.

[0049] When the side plow cylinder 11 returns oil during descending: The hydraulic oil in the rodless cavity of the side plow cylinder 11 flows through the first oil port through the third oil port of the two-position three-way electromagnetic reversing valve 6, then enters the rear proportional speed control valve 4, and returns to the fuel tank through the T port.

[0050] When the plowing depth cylinder rises: The two-position three-way electromagnetic reversing valve 6 is de-energized, its third oil port communicates with its second oil port, hydraulic oil enters the connecting oil circuit unit through the P port, and the hydraulic oil enters the rodless cavity of the plowing depth cylinder through the third oil port and the second oil port, and the oil in it pushes the piston rod of the plowing depth cylinder to move upward.

[0051] When the plowing depth cylinder returns oil by its own weight: The hydraulic oil in the rodless cavity of the plowing depth cylinder flows through the second oil port through the third oil port of the two-position three-way electromagnetic reversing valve 6, and finally enters the rear proportional speed control valve and returns to the fuel tank through the T port.

[0052] Advantages of the present invention:

[0053] (1) A two-position three-way electromagnetic reversing valve 6 is connected in series in the oil circuit, and together with the original valve group (including the front proportional speed regulating valve 1, the pressure compensation valve 2, the throttle plate 3, the rear proportional speed regulating valve 4, and the one-way valve 5) a new integral valve group (the hydraulic valve is installed on the same valve block) is formed. The original proportional speed regulating valve is used to realize the proportional control of the rise and fall of the side plow cylinder 11, and the rise is provided with pressure compensation. Here, the original resources are fully utilized, and the new function is realized by adding as few components as possible. The volume and cost are small; it is easy to install, and the stepless speed regulation function of the side plow cylinder 11 is realized. The hydraulic system is concise and compact, the number of hydraulic components is minimized, and the occurrence of failure rate is reduced; it is easier to implement and maintain.

[0054] Conventional solution: Add 2 proportional valves + reversing valve, which has a bulky structure.

[0055] (2) Two-position two-way solenoid reversing valve 2 7 and two-position two-way solenoid reversing valve 1 8 (compose a new valve group and are installed on the same valve block) are used to separate the plowing depth cylinder from the side plowing cylinder 11 and to raise and lower the side plowing cylinder 11. The two valves are combined on one valve block to avoid multi-valve and multi-component control. The structure is compact, the volume is small, and the cost is low.

[0056] Conventional solution: solenoid reversing valve + one-way valve + solenoid reversing valve, with more hydraulic valves, larger size and higher cost.

[0057] (3) A level sensor 16 is installed on the plow frame 12, which is disconnected at the tail end of the plow frame 12, and a side plow cylinder 11 is added. The side plow cylinder 11 and the plow frame 12 are both connected by hinges at the disconnection point, so that the plow 13 can follow the side plow cylinder 11. Specifically, one side plow cylinder 11 is used instead of two or more; a level sensor 16 is used to coordinate the cylinder lifting; the side plow cylinder 11 and the plow frame 12 are both connected by hinges at the disconnection point; the cylinder is installed and the plow frame 12 is disconnected at the tail end of the plow frame 12.

[0058] Conventional solution: An oil cylinder is installed on each side of the plow frame 12, and two proportional valves are used for closed-loop control synchronization. Two displacement sensors are used for coordination.

[0059] Advantages of the present invention:

[0060] (1) The height of the left and right sides of the plow frame 12 is used as a reference, and the height of the left and right plow frames 12 is fine-tuned through a closed loop, and the inclination angle is dynamically controlled to be less than the allowable value. The horizontal sensor 16 is used in conjunction with one cylinder for control, rather than a displacement sensor and two cylinders. This avoids multi-cylinder and multi-component control, and is easy to implement and maintain.

[0061] (2) The side plow cylinder 11 is hinged to both the plow frame 12 and the disconnection point, enabling the plow 13 to follow the side plow cylinder 11. The structure is relatively simple. That is, the disconnection at point II + shaft hinge is the key for the side plow cylinder to lift. Because of the disconnection, the plow frame is no longer a whole but is divided into left and right sections; the hinge will generate dynamic displacement.

[0062] (3) The positions where the cylinder is installed and the plow frame 12 is disconnected are both at the tail of the plow frame 12. This avoids multiple disconnections and multiple controls.

[0063] (4) The proportional valve of the original system is borrowed, and the lifting of the side plow cylinder 11 is proportionally controlled (with pressure compensation during rising), and the control is relatively precise.

[0064] (5) The two-position two-way electromagnetic directional valve II 7 is equipped with two check valves to achieve zero-leakage isolation. The two-position two-way electromagnetic directional valve I 8 is equipped with a check valve, which is a cone valve seal with zero leakage, and can prevent pressure loss caused by leakage of ordinary slide valves. The two valves are combined into one valve block to avoid multi-valve and multi-component control. The structure is compact, the volume is small, and the cost is low.

[0065] (6) The stiffening plates are all made of channel steel, and the distribution positions of the channel steel welding.

[0066] Conventional scheme: The number of stiffening plates is more or less, and the position distributions are different.

[0067] Advantages of the present invention: The stiffening plates are all made of channel steel, and the first stiffening plate 15, the second stiffening plate 17, and the third stiffening plate 18 are added. The first stiffening plate 15 and the second stiffening plate 17 are welded in a trapezoidal shape. Because the trapezoid extends to a triangle, and the triangle has stability; the second stiffening plate 17 and the third stiffening plate 18 are welded together through the fourth stiffening plate. The second stiffening plate 17 and the third stiffening plate 18 are actually one channel steel cut into two sections. After welding, they are in a straight line, which is more firm; the above-mentioned stiffening plates are welded to offset the shear stress of the cylinder on the left and right sides of the plow frame 12 and prevent the plow frame 12 from deforming. The structure is simple, avoiding multi-stiffening plate and multi-position welding.

[0068] The above is only the preferred embodiment of the present invention and does not impose any limitation on the present invention. Any person skilled in the art within the technical field, without departing from the technical solution of the present invention, makes any form of equivalent replacement or modification and other changes to the technical solution and technical content disclosed by the present invention, all of which belong to the content within the technical solution of the present invention and still fall within the protection scope of the present invention.

Claims

1. An integrated control system for the plowing depth on both sides of an agricultural tractor, characterized in that, Comprising: A connecting oil circuit unit, whose input end forms a P port and whose output end forms a T port; the connecting oil circuit unit includes a one-way valve and a rear proportional speed control valve, and the one-way valve conducts from the P port towards the rear proportional speed control valve; A pair of plough depth cylinders, and the rodless cavities of the two plough depth cylinders are connected through a first oil circuit; A two-position three-way electromagnetic reversing valve, used to switch the driving oil circuits of the plough depth cylinders and the side plough cylinders, its third oil port is connected to the second oil circuit between the one-way valve and the rear proportional speed control valve, its first oil port is connected to the rodless cavity of the side plough cylinder, and its second oil port is connected to the first oil circuit between the two plough depth cylinders; A two-position two-way electromagnetic reversing valve 1, used to return the oil in the rod cavity of the side plough cylinder to the T1 port when the side plough cylinder rises, and one passage of the two-position two-way electromagnetic reversing valve 1 is connected between the rod cavity of the side plough cylinder and the T1 port; The cylinder body of the side plough cylinder is hinged to the front section of the tail of the plough frame, and its piston rod is hinged to the rear section of the tail of the plough frame, and the front section and the rear section are connected through the side plough cylinder; a horizontal sensor is arranged on the plough frame.

2. The comprehensive control system for the plowing depth on both sides of the agricultural tractor according to claim 1, characterized in that, It further includes a two-position two-way electromagnetic reversing valve 2, used to cut off the oil between the P port and the rod cavity of the side plough cylinder; the two-position two-way electromagnetic reversing valve 2 is arranged between the P port and the two-position two-way electromagnetic reversing valve 1. When the side plough cylinder needs to descend, the two-position two-way electromagnetic reversing valve 2 is energized and conducts, and the two-position two-way electromagnetic reversing valve 1 is energized and cut off, and the oil flows from the P port through the two-position two-way electromagnetic reversing valve 2 into the rod cavity of the side plough cylinder.

3. The comprehensive control system for the plowing depths on both sides of the agricultural tractor according to claim 1, wherein The connecting oil circuit unit further includes a front proportional speed control valve, and the front proportional speed control valve is arranged between the P port and the one-way valve, and the front proportional speed control valve conducts when energized.

4. The comprehensive control system for the plowing depth on both sides of the agricultural tractor according to claim 1, wherein The connecting oil circuit unit further includes a pressure compensation valve, one of its oil ports is connected to the T port, and the other oil port is connected to the P port.

5. The integrated control system for the plowing depths on both sides of an agricultural tractor according to claim 1, wherein The rear section of the tail of the plough frame includes a first rear section and a second rear section, and the first rear section and the second rear section are hinged to each other.

6. The integrated control system for the plowing depths on both sides of the agricultural tractor according to claim 1, wherein A plough body is arranged on the bottom surface of the tail of the plough frame.

7. A control method for the plowing depth on both sides of an agricultural tractor, which is used for the comprehensive control system of the plowing depth on both sides of the agricultural tractor as described in claim 2, characterized in that, Comprising: Side plough cylinder rising: The two-position three-way electromagnetic reversing valve is energized, its third oil port communicates with its first oil port, the hydraulic oil enters the connecting oil circuit unit through the P port, and the hydraulic oil enters the rodless cavity of the side plough cylinder through the third oil port and the first oil port, and the oil therein pushes the piston rod of the side plough cylinder to move upward; Oil return when the side plough cylinder rises: The hydraulic oil in the rod cavity of the side plough cylinder flows into the de-energized two-position two-way electromagnetic reversing valve 1 and returns to the fuel tank through the T1 port; Side plough cylinder descending: The two-position three-way electromagnetic reversing valve, the two-position two-way electromagnetic reversing valve 2, and the two-position two-way electromagnetic reversing valve 1 are all energized, the hydraulic oil enters the connecting oil circuit unit from the P port, and successively passes through the two-position two-way electromagnetic reversing valve 2 and the two-position two-way electromagnetic reversing valve 1, and then enters the rod cavity of the side plough cylinder; Oil return when the side plough cylinder descends: The hydraulic oil in the rodless cavity of the side plough cylinder flows through the first oil port, through the third oil port of the two-position three-way electromagnetic reversing valve, then enters the rear proportional speed control valve, and flows back to the fuel tank through the T port.

8. The control method for the plowing depth on both sides of an agricultural tractor according to claim 7, characterized in that, It further includes: The plowing depth cylinder rises: The two-position three-way solenoid directional control valve loses power, and its third oil port is connected to its second oil port. The hydraulic oil enters the connecting oil circuit unit through the P port, and then enters the rodless cavity of the plowing depth cylinder through the third oil port and the second oil port. The oil inside it pushes the piston rod of the plowing depth cylinder to move upward; The plowing depth cylinder returns oil by its own weight: The hydraulic oil in the rodless cavity of the plowing depth cylinder flows through the third oil port of the two-position three-way solenoid directional control valve through the second oil port, and finally enters the rear proportional speed control valve and returns to the fuel tank through the T port.

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