Leveling valve block assembly and leveling system for tractor

Abstract

The invention relates to a leveling valve block assembly and a leveling system for a tractor. The valve block assembly comprises a main body, and a left-inclined leveling electromagnetic valve, a right-inclined leveling electromagnetic valve, a back-inclined leveling electromagnetic valve, a front-inclined leveling electromagnetic valve, an enabling electromagnetic valve and a speed regulating valve are inserted into the main body; a first oil duct, a third oil duct and a fourth oil duct are arranged in the main body; the two ends of the first oil duct are connected to an outlet of the speed regulating valve and an inlet of the enabling electromagnetic valve respectively, and one end of the third oil duct is a main body oil return opening. The other end of the third oil duct is connected to an enabling electromagnetic valve oil return port, a left-inclination leveling electromagnetic valve oil return port, a right-inclination leveling electromagnetic valve oil return port, a back-inclination leveling electromagnetic valve oil return port and a front-inclination leveling electromagnetic valve oil return port, and one end of the fourth oil duct is connected to an enabling electromagnetic valve outlet; and the other end of the fourth oil duct is connected to the inlet of each leveling electromagnetic valve. The leveling system comprises the leveling valve block assembly, a left-right leveling oil cylinder and a front-back leveling oil cylinder, the leveling speed can be adjusted, and four-direction leveling can be conducted.

Description

Technical Field

[0001] The invention relates to the technical field of tractors, and in particular to a leveling valve block assembly and a leveling system for a tractor. Background Art

[0002] When a tractor is operating on an uneven field, for wide implements, the unevenness will affect the flatness of the field operation; for long implements, the plowshare will have different depths, which will eventually cause the tractor to deviate and the flatness (quality) of the operation to decrease. Therefore, the tractor needs to be leveled during the operation.

[0003] At present, the implement leveling hydraulic system of tractors on the market mainly uses a quantitative system for single degree of freedom adjustment, which cannot be applied to a variable system and has poor effect when operating on fields with complex terrain. Therefore, the present invention proposes a leveling valve block assembly and a leveling system for tractors. Summary of the invention

[0004] Aiming at the problem that the existing tractor leveling system is only applicable to the quantitative system and has poor operation effect in fields with complex terrain, the present invention proposes a tractor leveling valve block assembly and a leveling system, and the specific technical scheme is as follows: A leveling valve block assembly for a tractor comprises a main body, on which a left-tilt leveling solenoid valve, a right-tilt leveling solenoid valve, a rear-tilt leveling solenoid valve, a forward-tilt leveling solenoid valve, an enabling solenoid valve and a speed regulating valve are inserted; a first oil passage, a third oil passage and a fourth oil passage are arranged in the main body; two ends of the first oil passage are respectively connected to the outlet of the speed regulating valve and the inlet of the enabling solenoid valve, one end of the third oil passage is the main body oil return port, the other end of the third oil passage is respectively connected to the oil return port of the enabling solenoid valve, the oil return port of the left-tilt leveling solenoid valve, the oil return port of the right-tilt leveling solenoid valve, the oil return port of the rear-tilt leveling solenoid valve and the oil return port of the forward-tilt leveling solenoid valve, one end of the fourth oil passage is connected to the outlet of the enabling solenoid valve, and the other end of the fourth oil passage is respectively connected to the inlet of the left-tilt leveling solenoid valve, the inlet of the right-tilt leveling solenoid valve, the inlet of the rear-tilt leveling solenoid valve and the inlet of the forward-tilt leveling solenoid valve.

[0005] Furthermore, a second oil channel is provided in the main body, and two ends of the second oil channel are respectively connected to the outlet of the enabling solenoid valve and the signal oil circuit one-way valve.

[0006] Furthermore, a pressure measuring joint is inserted into the main body, and the pressure measuring joint is connected to the fourth oil channel.

[0007] Furthermore, the left tilt leveling solenoid valve, the right tilt leveling solenoid valve, the rear tilt leveling solenoid valve, the forward tilt leveling solenoid valve and the enabling solenoid valve are all two-position three-way reversing valves.

[0008] A tractor leveling system comprises the above-mentioned leveling valve block assembly, left and right leveling cylinders, front and rear leveling cylinders and a controller, wherein the outlet of the left leveling solenoid valve is connected to the rodless chambers of the left and right leveling cylinders, and the outlet of the right leveling solenoid valve is connected to the rod chambers of the left and right leveling cylinders; the outlet of the rearward leveling solenoid valve is connected to the rodless chambers of the front and rear leveling cylinders, and the outlet of the forward leveling solenoid valve is connected to the rod chambers of the front and rear leveling cylinders, and the inlet of the speed control valve is connected to the hydraulic system.

[0009] The beneficial effects of the present invention are: 1. It meets the application requirements of variable hydraulic systems for high-horsepower tractors, so that when high-horsepower tractors are adapted to different machines, they can ensure a stable leveling speed by adjusting the flow of the speed regulating valve.

[0010] 2. It can be leveled in four directions, front, back, left, and right, and can operate on fields with complex terrain. The control valve adopts a cartridge valve structure, which has a simple structure and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0012] Figure 1 1 is a schematic diagram of the state of the leveling valve block assembly in the embodiment when it is not in action; Figure 2 2 is a schematic diagram of the state of the leveling valve block assembly when the left side is leveled in the embodiment; Figure 3 2 is a schematic diagram of the state of the leveling valve block assembly when the right side is leveled in the embodiment; Figure 4 is a schematic diagram of the state of the leveling valve block assembly after leveling in the embodiment; Figure 5 2 is a schematic diagram of the state of the leveling valve block assembly during front leveling in the embodiment; Figure 6 1 is a schematic diagram of the state of the leveling valve block assembly when the left front is leveled in the embodiment.

[0013] In the figure: 1. Left tilt leveling solenoid valve; 2. Right tilt leveling solenoid valve; 3. Backward tilt leveling solenoid valve; 4. Forward tilt leveling solenoid valve; 5. Speed ​​control valve; 6. Enable solenoid valve; 7. Main body; 8. Signal oil circuit one-way valve; 9. Pressure measuring joint; 10. Left and right leveling cylinders; 11. Front and rear leveling cylinders. DETAILED DESCRIPTION

[0014] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0015] The present invention provides the following specific embodiments: like Figure 1 As shown, in the first aspect, the present invention provides a leveling valve block assembly for a tractor, including a main body 7, on which a left-tilt leveling solenoid valve 1, a right-tilt leveling solenoid valve 2, a rear-tilt leveling solenoid valve 3, a forward-tilt leveling solenoid valve 4, an enabling solenoid valve 6 and a speed regulating valve 5 are installed, wherein the left-tilt leveling solenoid valve 1 is used for leveling when the implement is tilted to the left, the right-tilt leveling solenoid valve 2 is used for leveling when the implement is tilted to the right, the rear-tilt leveling solenoid valve 3 is used for leveling when the implement is tilted backward, the forward-tilt leveling solenoid valve 4 is used for leveling when the implement is tilted forward, the speed regulating valve 5 is used for adjusting the oil inlet flow rate, thereby adjusting the movement speed of the leveling cylinder, and the enabling solenoid valve 6 is used for controlling the oil inlet and pressure relief of the pressure oil circuit of the entire valve block assembly; the main body 7 is provided with a first oil passage L1, a third oil passage L3 and The fourth oil channel L4; the two ends of the first oil channel L1 are respectively connected to the outlet of the speed control valve 5 and the inlet P1 of the enabling solenoid valve 6, one end of the third oil channel L3 is the main body oil return port T, and the other end of the third oil channel L3 is respectively connected to the oil return port T1 of the enabling solenoid valve 6, the oil return port T2 of the left tilt leveling solenoid valve 1, the oil return port T3 of the right tilt leveling solenoid valve 2, the oil return port T4 of the rearward tilt leveling solenoid valve 3 and the oil return port T5 of the forward tilt leveling solenoid valve 4, one end of the fourth oil channel L4 is connected to the outlet U1 of the enabling solenoid valve 6, and the other end of the fourth oil channel L4 is respectively connected to the inlet P2 of the left tilt leveling solenoid valve 1, the inlet P3 of the right tilt leveling solenoid valve 2, the inlet P4 of the rearward tilt leveling solenoid valve 3 and the inlet P5 of the forward tilt leveling solenoid valve 4.

[0016] Furthermore, a second oil channel L2 is provided in the main body 7, and both ends of the second oil channel L2 are respectively connected to the outlet U1 of the enabling solenoid valve 6 and the signal oil circuit one-way valve 8. The signal oil circuit one-way valve 8 is used to transfer the working pressure of the leveling valve block assembly to the total signal oil circuit of the variable hydraulic system.

[0017] Furthermore, a pressure measuring joint 9 is inserted into the main body 7, and the pressure measuring joint 9 is connected to the fourth oil passage L4, and the pressure measuring joint 9 is used for convenient pressure measurement.

[0018] Furthermore, the left tilt leveling solenoid valve 1 , the right tilt leveling solenoid valve 2 , the rearward tilt leveling solenoid valve 3 , the forward tilt leveling solenoid valve 4 and the enabling solenoid valve 6 are all two-position three-way reversing valves.

[0019] The second invention provides a tractor leveling system, including the above-mentioned leveling valve block assembly, left and right leveling cylinders 10, front and rear leveling cylinders 11 and a controller. The controller receives the feedback signal of the gyroscope installed on the agricultural implement connected to the rear suspension mechanism, controls the left leveling solenoid valve 1, the right leveling solenoid valve 2, the rear leveling solenoid valve 3, the front leveling solenoid valve 4 and the enabling solenoid valve 6 to achieve the leveling of the agricultural implement. The outlet U2 of the left leveling solenoid valve 1 is connected to the rodless cavity of the left and right leveling cylinders 10, and the outlet U3 of the right leveling solenoid valve 2 is connected to the rod cavity of the left and right leveling cylinders 10; the outlet U4 of the rear leveling solenoid valve 3 is connected to the rodless cavity of the front and rear leveling cylinders 11, and the outlet U5 of the front leveling solenoid valve 4 is connected to the rod cavity of the front and rear leveling cylinders 11. The inlet of the speed control valve 5 is connected to the hydraulic system.

[0020] The leveling valve block assembly has three working states: non-working, single leveling and compound leveling, as follows: When leveling is not required, the leveling valve block assembly does not operate. Figure 1 As shown, the left tilt leveling solenoid valve 1, the right tilt leveling solenoid valve 2, the rear tilt leveling solenoid valve 3, the forward tilt leveling solenoid valve 4 and the enabling solenoid valve 6 shall not be energized, and under the action of the reset spring, they all work in the left position, and the inlets of the four leveling solenoid valves are connected to the oil return port of the main body 7 through the fourth oil channel L4, the outlet U1 of the enabling solenoid valve 6, the return port T1, and then returned to the oil tank to achieve pressure relief; the outlet U2 and the return port T2 of the left tilt leveling solenoid valve 1 connected to the working oil ports of the left and right leveling cylinders 10 are connected to the oil return port of the main body 7 through the third oil channel L3 and then returned to the oil tank to achieve pressure relief; The outlet U3 and the oil return port T3 of the right tilt leveling solenoid valve 2 connected to the working oil ports of the left and right leveling cylinders 10 are connected to the oil return port of the main body 7 through the third oil channel L3 and then returned to the oil tank to achieve pressure relief; the outlet U4 and the return port T4 of the rear tilt leveling solenoid valve 3 connected to the working oil ports of the front and rear leveling cylinders 11 are connected to the return port of the main body 7 through the third oil channel L3 and then returned to the oil tank to achieve pressure relief; the outlet U5 and the return port T5 of the forward tilt leveling solenoid valve 4 connected to the working oil ports of the front and rear leveling cylinders 11 are connected to the return port T of the main body through the third oil channel L3 and then returned to the oil tank to achieve pressure relief. At this time, the left and right leveling cylinders 10 and the front and rear leveling cylinders 11 are not working.

[0021] When it is left-leaning (monotonic flat), Figure 2As shown, the right tilt leveling solenoid valve 2, the rear tilt leveling solenoid valve 3, and the forward tilt leveling solenoid valve 4 are all de-energized and work in the left position under the action of the reset spring. The left tilt leveling solenoid valve 1 and the enabling solenoid valve 6 are energized and work in the right position. The pressure oil enters the rodless chamber of the left and right leveling oil cylinders 10 through the inlet of the speed regulating valve 5, the enabling solenoid valve 6 and the left tilt leveling solenoid valve 1, and the piston rods of the left and right leveling oil cylinders 10 extend. The hydraulic oil in the rod chamber of the left and right leveling oil cylinders 10 passes through the right tilt leveling solenoid valve 2, and then returns to the oil tank through the third oil channel L3 and the main body oil return port T, realizing left tilt leveling.

[0022] When it is right-leaning (monotonic flat), Figure 3 As shown, the left tilt leveling solenoid valve 1, the rear tilt leveling solenoid valve 3, and the forward tilt leveling solenoid valve 4 are all de-energized and work in the left position under the action of the reset spring. The right tilt leveling solenoid valve 2 and the enabling solenoid valve 6 are energized and work in the right position. The pressure oil enters the fourth oil channel L4 through the inlet of the speed control valve 5 through the enabling solenoid valve 6, and then enters the rod chamber of the left and right leveling oil cylinders 10 through the right tilt leveling solenoid valve 2. The piston rods of the left and right leveling oil cylinders 10 are retracted, and the hydraulic oil in the rodless chamber of the left and right leveling oil cylinders 10 passes through the left tilt leveling solenoid valve 1, and then returns to the oil tank through the third oil channel L3 and the main body oil return port T, realizing right tilt leveling.

[0023] When tilted backward (monotonically flat), Figure 4 As shown, the left tilt leveling solenoid valve 1, the right tilt leveling solenoid valve 2, and the forward tilt leveling solenoid valve 4 are all de-energized and work in the left position under the action of the reset spring. The backward tilt leveling solenoid valve 3 and the enabling solenoid valve 6 are energized and work in the right position. The pressure oil enters the fourth oil channel L4 through the inlet of the speed control valve 5 through the enabling solenoid valve 6, and then enters the rodless chamber of the front and rear leveling cylinder 11 through the backward tilt leveling solenoid valve 3. The piston rod of the front and rear leveling cylinder 11 extends out, and the hydraulic oil in the rod chamber of the front and rear leveling cylinder 11 passes through the forward tilt leveling solenoid valve 4, and then returns to the oil tank through the third oil channel L3 and the main body oil return port T, realizing backward tilt leveling.

[0024] When leaning forward (monotonously flat), Figure 5 As shown, the left tilt leveling solenoid valve 1, the right tilt leveling solenoid valve 2, and the rearward tilt leveling solenoid valve 3 are all de-energized and work in the left position under the action of the reset spring. The forward tilt leveling solenoid valve 4 and the enabling solenoid valve 6 are energized and work in the right position. The pressure oil enters the fourth oil channel L4 through the inlet of the speed control valve 5 through the enabling solenoid valve 6, and then enters the rod chamber of the front and rear leveling cylinder 11 through the forward tilt leveling solenoid valve 4. The piston rod of the front and rear leveling cylinder 11 is retracted, and the hydraulic oil in the rodless chamber of the front and rear leveling cylinder 11 passes through the rearward tilt leveling solenoid valve 3, and then returns to the oil tank through the third oil channel L3 and the main body oil return port T to achieve forward tilt leveling.

[0025] When compound leveling, Figure 6As shown, taking the left front tilt as an example, the right tilt leveling solenoid valve 2 and the rear tilt leveling solenoid valve 3 are both de-energized and work in the left position under the action of the reset spring. The left tilt leveling solenoid valve 1, the front tilt leveling solenoid valve 4 and the enabling solenoid valve 6 are energized and work in the right position. The pressure oil enters the fourth oil passage L4 through the inlet of the speed regulating valve 5 through the enabling solenoid valve 6, and then enters the rodless chamber of the left and right leveling cylinders 10 and the rod chamber of the front and rear leveling cylinders 11 through the left tilt leveling solenoid valve 1 and the front tilt leveling solenoid valve 4, respectively, so that the piston rod of the left and right leveling cylinders 10 extends and the piston rod of the front and rear leveling cylinders 11 retracts. The hydraulic oil in the rod chamber of the left and right leveling cylinders 10 passes through the right tilt leveling solenoid valve 2, and the hydraulic oil in the rodless chamber of the front and rear leveling cylinders 11 passes through the rear tilt leveling solenoid valve 3, and then returns to the oil tank through the third oil passage L3 and the main body oil return port T, realizing the left front tilt leveling.

[0026] The application requirements of variable hydraulic systems for high-horsepower tractors are met, so that when high-horsepower tractors are adapted to different implements, a stable leveling speed can be ensured by adjusting the flow of the speed regulating valve 5.

[0027] It can be leveled in four directions, front, back, left, and right, and can operate on fields with complex terrain. The control valve adopts a cartridge valve structure, which has a simple structure and low cost.

[0028] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A leveling valve block assembly for a tractor, characterized in that: The invention comprises a main body (7), on which a left tilt leveling solenoid valve (1), a right tilt leveling solenoid valve (2), a rear tilt leveling solenoid valve (3), a forward tilt leveling solenoid valve (4), an enabling solenoid valve (6) and a speed regulating valve (5) are installed; a first oil passage, a third oil passage and a fourth oil passage are arranged in the main body (7); The two ends of the first oil passage are respectively connected to the outlet of the speed regulating valve (5) and the inlet of the enabling solenoid valve (6); one end of the third oil passage is the main body oil return port; the other end of the third oil passage is respectively connected to the oil return port of the enabling solenoid valve (6), the oil return port of the left tilt leveling solenoid valve (1), the oil return port of the right tilt leveling solenoid valve (2), the oil return port of the rear tilt leveling solenoid valve (3) and the oil return port of the forward tilt leveling solenoid valve (4); one end of the fourth oil passage is connected to the outlet of the enabling solenoid valve (6); the other end of the fourth oil passage is respectively connected to the inlet of the left tilt leveling solenoid valve (1), the inlet of the right tilt leveling solenoid valve (2), the inlet of the rear tilt leveling solenoid valve (3) and the inlet of the forward tilt leveling solenoid valve (4).

2. A leveling valve block assembly for a tractor according to claim 1, characterized in that: A second oil passage is also provided in the main body (7), and two ends of the second oil passage are respectively connected to the outlet of the enabling solenoid valve (6) and the signal oil circuit one-way valve (8).

3. The leveling valve block assembly for a tractor according to claim 1, characterized in that: A pressure measuring joint (9) is also inserted into the main body (7), and the pressure measuring joint (9) is connected to the fourth oil passage.

4. The leveling valve block assembly for a tractor according to claim 1, characterized in that: The left tilt leveling solenoid valve (1), the right tilt leveling solenoid valve (2), the rear tilt leveling solenoid valve (3), the forward tilt leveling solenoid valve (4) and the enabling solenoid valve (6) are all two-position three-way reversing valves.

5. A tractor leveling system, comprising the leveling valve block assembly according to any one of claims 1 to 3, characterized in that: It also includes left and right leveling cylinders (10), front and rear leveling cylinders (11) and a controller. The outlet of the left-tilt leveling solenoid valve (1) is connected to the rodless chambers of the left and right leveling cylinders (10), and the outlet of the right-tilt leveling solenoid valve (2) is connected to the rod chambers of the left and right leveling cylinders (10); the outlet of the rearward-tilt leveling solenoid valve (3) is connected to the rodless chambers of the front and rear leveling cylinders (11), and the outlet of the forward-tilt leveling solenoid valve (4) is connected to the rod chambers of the front and rear leveling cylinders (11); and the inlet of the speed control valve (5) is connected to a hydraulic system pressure oil source.

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