Hydraulic system and rice machine

Abstract

The invention relates to the technical field of agricultural machinery, in particular to a hydraulic system and a rice machine. The hydraulic system comprises a pump body, a priority valve, a first header proportional valve, a second header proportional valve, a left chassis proportional valve, a right chassis proportional valve and a grain unloading proportional valve; the pump body is connected with an oil inlet of the priority valve, a first oil outlet of the priority valve is connected with an oil inlet of the header oil cylinder through the first header proportional valve, and the second header proportional valve is connected between the oil inlet of the header oil cylinder and the oil return pipeline; a second oil outlet of the priority valve is connected with a left chassis proportional valve, a right chassis proportional valve and a grain unloading proportional valve, the left chassis proportional valve is connected with a left chassis lifting oil cylinder, the right chassis proportional valve is connected with a right chassis lifting oil cylinder, and the grain unloading proportional valve is connected with a grain unloading oil cylinder. According to the hydraulic system and the rice machine, the problems that when a header of an existing rice machine ascends and descends, a chassis and a grain unloading barrel cannot ascend and descend, and all actions of the whole rice machine are poor in stability and severe in shaking are solved.

Description

Technical Field

[0001] The present application relates to the technical field of agricultural machinery, and in particular to a hydraulic system and a rice machine. Background Art

[0002] At present, with the development of agricultural mechanization, rice combine harvesters have been more widely used. As an important hydraulic control part of the rice harvester, its operation convenience, flexibility, complexity, reliability, etc. directly affect the performance of the whole machine. The existing rice harvester hydraulic system is mainly operated by mechanical valves and cannot achieve compound actions. Its performance, reliability, and ergonomics are relatively low and need to be improved.

[0003] In the prior art, the hydraulic control system commonly used in rice harvesters is a single pump system, including a cutting platform oil cylinder, a chassis lifting oil cylinder and a grain unloading oil cylinder. However, the single pump system cannot realize the combination of turning the cutting platform and other actions, that is, when the cutting platform is raised or lowered, the chassis and grain unloading barrel cannot be raised or lowered. In addition, the stability of each action of the whole vehicle is poor and the shaking is serious. Summary of the invention

[0004] The purpose of the present application is to provide a hydraulic system and a rice harvester, thereby solving the problem that, when the harvesting platform is raised or lowered, the chassis and the grain unloading barrel cannot be raised or lowered, and the stability of each movement of the whole vehicle is poor and the shaking is serious.

[0005] According to a first aspect of the present application, a hydraulic system is provided, which includes a pump body, a priority valve, a cutter cylinder, a left chassis lifting cylinder, a right chassis lifting cylinder, a grain unloading cylinder, a first cutter proportional valve, a second cutter proportional valve, a left chassis proportional valve, a right chassis proportional valve and a grain unloading proportional valve; the pump body is connected to the oil inlet of the priority valve, the first oil outlet of the priority valve is connected to the oil inlet of the cutter cylinder through the first cutter proportional valve, and the second cutter proportional valve is connected between the oil inlet of the cutter cylinder and the return oil pipeline; the second oil outlet of the priority valve is respectively connected to the left chassis proportional valve, the right chassis proportional valve and the grain unloading proportional valve, the left chassis proportional valve is connected to the left chassis lifting cylinder, the right chassis proportional valve is connected to the right chassis lifting cylinder, and the grain unloading proportional valve is connected to the grain unloading cylinder.

[0006] In any of the above technical schemes, further, the left chassis proportional valve, the right chassis proportional valve and the grain unloading proportional valve are all three-position four-way valves; the second oil outlet of the priority valve is connected to the oil inlet of the left chassis proportional valve, the first oil outlet and the second oil outlet of the left chassis proportional valve are respectively connected to the first oil inlet and the second oil inlet of the left chassis lifting cylinder, and the oil return port of the left chassis proportional valve is connected to the return oil pipeline; the second oil outlet of the priority valve is connected to the oil inlet of the right chassis proportional valve, the first oil outlet and the second oil outlet of the right chassis proportional valve are respectively connected to the first oil inlet and the second oil inlet of the right chassis lifting cylinder, and the oil return port of the right chassis proportional valve is connected to the return oil pipeline; the second oil outlet of the priority valve is connected to the oil inlet of the grain unloading proportional valve, the first oil outlet of the grain unloading proportional valve is connected to the oil inlet of the grain unloading cylinder, and the oil return port of the grain unloading proportional valve is connected to the return oil pipeline.

[0007] In any of the above technical solutions, further, the hydraulic system also includes a pressure compensator; the first oil inlet and the second oil inlet of the pressure compensator are respectively connected to the oil outlet of the pump body and the second cutter proportional valve, and the oil return port of the pressure compensator is connected to the oil return pipeline.

[0008] In any of the above technical solutions, further, the hydraulic system also includes a vehicle controller, a left chassis and a right chassis. When in manual mode, when the left chassis rises, the vehicle controller receives a left chassis rising signal, and the vehicle controller sends a signal to the left chassis proportional valve, and the left chassis proportional valve controls the left chassis lifting cylinder to rise. When the stroke sensor in the left chassis lifting cylinder detects that the extension length of the plug rod exceeds a maximum predetermined value, the vehicle controller stops sending a signal to the left chassis proportional valve;

[0009] When the left chassis is lowered, the vehicle controller receives a left chassis lowering signal, and the vehicle controller sends a signal to the left chassis proportional valve, and the left chassis proportional valve controls the left chassis lifting cylinder to lower. When the stroke sensor in the left chassis lifting cylinder detects that the extended length of the plug rod is lower than a minimum predetermined value, the vehicle controller stops sending signals to the left chassis proportional valve;

[0010] When the right chassis rises, the vehicle controller receives a right chassis rising signal, and the vehicle controller sends a signal to the right chassis proportional valve, and the right chassis proportional valve controls the right chassis lifting cylinder to rise. When the stroke sensor in the right chassis lifting cylinder detects that the extension length of the plug rod exceeds the maximum predetermined value, the vehicle controller stops sending signals to the right chassis proportional valve;

[0011] When the right chassis descends, the vehicle controller receives a right chassis descending signal, and the vehicle controller sends a signal to the right chassis proportional valve. The right chassis proportional valve controls the right chassis lifting cylinder to descend. When the stroke sensor in the right chassis lifting cylinder detects that the extended length of the plug rod is lower than the minimum preset value, the vehicle controller stops sending signals to the right chassis proportional valve.

[0012] In any of the above technical solutions, further, when in manual mode, when the left chassis rises and the right chassis falls, the vehicle controller receives a left chassis rising signal and a right chassis falling signal; the vehicle controller sends a signal to the left chassis proportional valve, and the left chassis proportional valve controls the left chassis lifting cylinder to rise, and when the stroke sensor in the left chassis lifting cylinder detects that the extended length of the plug rod exceeds the maximum predetermined value, the vehicle controller stops sending signals to the left chassis proportional valve; at the same time, the vehicle controller sends a signal to the right chassis proportional valve, and the right chassis proportional valve controls the right chassis lifting cylinder to fall, and when the stroke sensor in the right chassis lifting cylinder detects that the extended length of the plug rod is lower than the minimum predetermined value, the vehicle controller stops sending signals to the right chassis proportional valve;

[0013] When the left chassis descends and the right chassis rises, the vehicle controller receives a left chassis descending signal and a right chassis rising signal; the vehicle controller sends a signal to the left chassis proportional valve, and the left chassis proportional valve controls the left chassis lifting cylinder to descend. When the stroke sensor in the left chassis lifting cylinder detects that the extended length of the plug rod is lower than the minimum preset value, the vehicle controller stops sending signals to the left chassis proportional valve; at the same time, the vehicle controller sends a signal to the right chassis proportional valve, and the right chassis proportional valve controls the right chassis lifting cylinder to rise. When the stroke sensor in the right chassis lifting cylinder detects that the extended length of the plug rod exceeds the maximum preset value, the vehicle controller stops sending signals to the right chassis proportional valve.

[0014] In any of the above technical solutions, further, when in manual mode, when the left chassis and the right chassis rise simultaneously, the vehicle controller receives a signal that the left chassis and the right chassis rise simultaneously, and if the difference between the extended length of the plug rod in the left chassis lifting cylinder and the extended length of the plug rod in the right chassis lifting cylinder is greater than 10 mm, the vehicle controller controls the left chassis lifting cylinder or the right chassis lifting cylinder with the smaller extended length of the plug rod to rise until the difference between the extended length of the plug rod in the left chassis lifting cylinder and the extended length of the plug rod in the right chassis lifting cylinder is ≤10 mm;

[0015] If the difference between the extended length of the plug rod in the left chassis lifting cylinder and the extended length of the plug rod in the right chassis lifting cylinder is ≤10mm, the vehicle controller controls to send a signal to the left chassis proportional valve and the right chassis proportional valve, and the left chassis proportional valve and the right chassis proportional valve control the left chassis lifting cylinder and the right chassis lifting cylinder to rise simultaneously;

[0016] During the simultaneous ascent of the left chassis and the right chassis, if the difference between the extended length of the plug rod in the left chassis lifting cylinder and the extended length of the plug rod in the right chassis lifting cylinder is greater than 10 mm, the vehicle controller stops sending signals to the left chassis proportional valve and the right chassis proportional valve, and then the vehicle controller controls the left chassis lifting cylinder or the right chassis lifting cylinder with the smaller extended length of the plug rod to rise until the difference between the extended length of the plug rod in the left chassis lifting cylinder and the extended length of the plug rod in the right chassis lifting cylinder is ≤10 mm.

[0017] In any of the above technical solutions, further, when in manual mode, when the left chassis and the right chassis are lowered at the same time, the vehicle controller receives a signal that the left chassis and the right chassis are lowered at the same time, and if the difference between the extended length of the plug rod in the left chassis lifting cylinder and the extended length of the plug rod in the right chassis lifting cylinder is greater than 10 mm, the vehicle controller controls the left chassis lifting cylinder or the right chassis lifting cylinder with the larger extended length of the plug rod to descend until the difference between the extended length of the plug rod in the left chassis lifting cylinder and the extended length of the plug rod in the right chassis lifting cylinder is ≤10 mm;

[0018] If the difference between the extended length of the plug rod in the left chassis lifting cylinder and the extended length of the plug rod in the right chassis lifting cylinder is ≤10mm, the vehicle controller controls to send a signal to the left chassis proportional valve and the right chassis proportional valve, and the left chassis proportional valve and the right chassis proportional valve control the left chassis lifting cylinder and the right chassis lifting cylinder to descend simultaneously;

[0019] During the simultaneous lowering of the left chassis and the right chassis, if the difference between the extended length of the plug rod in the left chassis lifting cylinder and the extended length of the plug rod in the right chassis lifting cylinder is greater than 10 mm, the vehicle controller stops sending signals to the left chassis proportional valve and the right chassis proportional valve, and then the vehicle controller controls the left chassis lifting cylinder or the right chassis lifting cylinder with the larger extended length of the plug rod to descend until the difference between the extended length of the plug rod in the left chassis lifting cylinder and the extended length of the plug rod in the right chassis lifting cylinder is ≤10 mm.

[0020] In any of the above technical solutions, further, when in automatic mode, when the left chassis and the right chassis are automatically leveled, the vehicle controller receives the automatic leveling signal of the left chassis and the right chassis, and if the vehicle body is tilted >3°, the vehicle controller controls the left chassis lifting cylinder or the right chassis lifting cylinder on the higher side of the vehicle body to descend, and if the left chassis lifting cylinder or the right chassis lifting cylinder on the higher side of the vehicle body descends to a certain position and the vehicle body is tilted ≤3°, then the automatic leveling is completed.

[0021] In any of the above technical solutions, further, when in automatic mode, if the vehicle body tilts more than 3°, the vehicle controller controls the left chassis lifting cylinder or the right chassis lifting cylinder on the higher side of the vehicle body to descend, and if the left chassis lifting cylinder or the right chassis lifting cylinder on the higher side of the vehicle body descends to a certain position and the vehicle body tilts ≤3°, automatic leveling is completed;

[0022] If the body tilt is still greater than 3° when the left chassis lifting cylinder or the right chassis lifting cylinder on the higher side of the body descends to the lowest position, the vehicle controller controls the left chassis lifting cylinder or the right chassis lifting cylinder on the lower side of the body to rise; if the body tilt is ≤3° when the left chassis lifting cylinder or the right chassis lifting cylinder on the lower side of the body rises to a certain position, automatic leveling is completed.

[0023] According to a second aspect of the present application, a rice machine is provided, comprising the hydraulic system as described above.

[0024] The hydraulic system of the present application includes a pump body, a priority valve, a cutting platform cylinder, a left chassis lifting cylinder, a right chassis lifting cylinder, a grain unloading cylinder, a first cutting platform proportional valve, a second cutting platform proportional valve, a left chassis proportional valve, a right chassis proportional valve and a grain unloading proportional valve. Among them, the pump body is connected to the oil inlet of the priority valve, the first oil outlet of the priority valve is connected to the oil inlet of the cutting platform cylinder through the first cutting platform proportional valve, and the second cutting platform proportional valve is connected between the oil inlet of the cutting platform cylinder and the return oil pipeline; the second oil outlet of the priority valve is respectively connected to the left chassis proportional valve, the right chassis proportional valve and the grain unloading proportional valve, the left chassis proportional valve is connected to the left chassis lifting cylinder, the right chassis proportional valve is connected to the right chassis lifting cylinder, and the grain unloading proportional valve is connected to the grain unloading cylinder.

[0025] According to the above technical features, the beneficial effects of this application are:

[0026] The pump body of the present application provides a power source for the cutting platform cylinder, the left chassis lifting cylinder, the right chassis lifting cylinder, and the grain unloading cylinder. When the hydraulic system of the present application needs to synchronously operate the cutting platform cylinder and any one (or multiple) of the left chassis lifting cylinder, the right chassis lifting cylinder, and the grain unloading cylinder, the priority valve can first provide a stable flow to the first cutting platform proportional valve (the first cutting platform proportional valve controls the lifting of the cutting platform cylinder, and when the second cutting platform proportional valve is energized, the cutting platform cylinder is lowered by gravity), and the remaining flow is given to any one (or multiple) of the left chassis proportional valve (controlling the left chassis lifting cylinder), the right chassis proportional valve (controlling the right chassis lifting cylinder), and the grain unloading proportional valve (controlling the grain unloading cylinder) to achieve a compound action, greatly improving the convenience of users.

[0027] The single pump system of the present application can realize the compound action of the cutting platform action and any one (or multiple) operations of the chassis lifting and lowering, and the grain unloading drum lifting and lowering. Each action is controlled by an independent proportional valve, which greatly improves the stability of each action, avoids severe shaking, and improves the handling comfort of the whole vehicle.

[0028] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 The overall principle schematic diagram of the hydraulic system of the present application is shown;

[0031] Figure 2 A schematic diagram showing the logic of raising or lowering the left chassis of the present application;

[0032] Figure 3 A schematic diagram showing the logic of raising or lowering the right chassis of the present application;

[0033] Figure 4 A schematic diagram showing the logic of the left chassis rising and the right chassis falling of the present application;

[0034] Figure 5 A schematic diagram showing the logic of the left chassis and the right chassis rising together in the present application;

[0035] Figure 6 A schematic diagram showing the logic of automatic leveling of the left chassis and the right chassis of the present application.

[0036] Icons: 1-gear pump; 2-first relief valve; 3-enabling valve; 4-priority valve; 5-second relief valve; 6-first cutter platform proportional valve; 7-pressure compensator; 8-second cutter platform proportional valve; 9-left chassis proportional valve; 10-right chassis proportional valve; 11-grain unloading proportional valve; 12-cutter platform cylinder; 13-left chassis lifting cylinder; 14-right chassis lifting cylinder; 15-grain unloading cylinder; 16-electromagnetic multi-way valve; 17-return oil pipeline; 18-first pipeline. DETAILED DESCRIPTION

[0037] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0038] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0039] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0040] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0041] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0042] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0043] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0044] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0045] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0046] The first aspect of the present application provides a hydraulic system, thereby solving the problem that in the existing rice harvester, when the harvesting platform is raised or lowered, the chassis and the grain unloading barrel cannot be raised or lowered, and the stability of each movement of the whole vehicle is poor and the shaking is serious.

[0047] Refer to the following Figures 1 to 6 A hydraulic system according to some embodiments of the present application is described.

[0048] like Figure 1 As shown, the hydraulic system of the present application includes a pump body, a priority valve 4, a header cylinder 12, a left chassis lifting cylinder 13, a right chassis lifting cylinder 14, a grain unloading cylinder 15, a first header proportional valve 6, a second header proportional valve 8, a left chassis proportional valve 9, a right chassis proportional valve 10 and a grain unloading proportional valve 11. Among them, the pump body is connected to the oil inlet of the priority valve 4, the first oil outlet of the priority valve 4 is connected to the oil inlet of the header cylinder 12 through the first header proportional valve 6, and the second header proportional valve 8 is connected between the oil inlet of the header cylinder 12 and the return oil pipeline 17; the second oil outlet of the priority valve 4 is respectively connected to the left chassis proportional valve 9, the right chassis proportional valve 10 and the grain unloading proportional valve 11, the left chassis proportional valve 9 is connected to the left chassis lifting cylinder 13, the right chassis proportional valve 10 is connected to the right chassis lifting cylinder 14, and the grain unloading proportional valve 11 is connected to the grain unloading cylinder 15.

[0049] The pump body of the present application provides a power source for the cutting platform cylinder 12, the left chassis lifting cylinder 13, the right chassis lifting cylinder 14, and the grain unloading cylinder 15. When the hydraulic system of the present application needs to synchronously operate any one (or multiple) of the cutting platform cylinder 12 and the left chassis lifting cylinder 13, the right chassis lifting cylinder 14, and the grain unloading cylinder 15, the priority valve 4 can first provide a stable flow to the first cutting platform proportional valve 6 (the first cutting platform proportional valve 6 controls the lifting and lowering of the cutting platform cylinder 12, and when the second cutting platform proportional valve 8 is energized, the cutting platform cylinder 12 is lowered by gravity), and the remaining flow is given to any one (or multiple) of the left chassis proportional valve 9 (controlling the left chassis lifting cylinder 13), the right chassis proportional valve 10 (controlling the right chassis lifting cylinder 14) and the grain unloading proportional valve 11 (controlling the grain unloading cylinder 15) to achieve a compound action, which greatly improves the convenience of users.

[0050] As described above, the single pump system of the present application can realize the composite action of the cutting platform action and the chassis lifting and lowering and the grain unloading drum lifting and lowering action in any one (or multiple) ways. Each action is controlled by an independent proportional valve, which greatly improves the stability of each action, avoids serious shaking, and improves the handling comfort of the whole vehicle. In addition, compared with the traditional dual pump system, the system of the present application is simple and has a higher cost performance.

[0051] In the examples of this application, see Figure 1 The pump body can be a gear pump 1, and the left chassis proportional valve 9, the right chassis proportional valve 10 and the grain unloading proportional valve 11 can all be three-position four-way valves. The gear pump 1 provides a power source for the header cylinder 12, the left chassis lifting cylinder 13, the right chassis lifting cylinder 14 and the grain unloading cylinder 15.

[0052] The gear pump 1 is connected to the oil inlet of the priority valve 4, the first oil outlet of the priority valve 4 is connected to the oil inlet of the cutting platform cylinder 12 through the first cutting platform proportional valve 6, and the second cutting platform proportional valve 8 is connected between the oil inlet of the cutting platform cylinder 12 and the return oil pipeline 17. In addition, the gear pump 1 is also connected to the first relief valve 2 and the enabling valve 3, and the first relief valve 2 and the enabling valve 3 are connected to the return oil pipeline 17. The setting of the first relief valve 2 facilitates the maintenance of the working pressure of the hydraulic control system, prevents the hydraulic control system from pressure overload, and improves the stability and reliability of the hydraulic control system.

[0053] In the examples of this application, see Figure 1 , the first header proportional valve 6 and the enabling valve 3 are energized, the header oil cylinder 12 is activated, and the header is lifted. The second header proportional valve 8 group and the enabling valve 3 are energized, the header oil cylinder 12 is lowered by gravity, and the header is lowered. When the first header proportional valve 6 and the second header proportional valve 8 are not energized, the hydraulic lock maintains the pressure on the header oil cylinder 12, and it can stop at any position within the working stroke.

[0054] In addition, the hydraulic system also includes a pressure compensator 7 and a second relief valve 5. The first oil inlet and the second oil inlet of the pressure compensator 7 are respectively connected to the oil outlet of the gear pump 1 and the second cutter proportional valve 8 (for example, the first oil inlet of the pressure compensator 7 is connected to the oil port MA1 of the electromagnetic multi-way valve 16), and the return oil port of the pressure compensator 7 is connected to the return oil pipeline 17. The setting of the pressure compensator 7 ensures the stability of the system flow and the stability of the cutter descent. The first cutter proportional valve 6 is connected to the oil inlet of the cutter cylinder 12 through the first pipeline 18, and the second relief valve 5 is connected between the first pipeline 18 and the return oil pipeline 17. The setting of the second relief valve 5 facilitates the maintenance of the working pressure of the hydraulic control system, prevents the hydraulic control system from pressure overload, and improves the stability and reliability of the hydraulic control system.

[0055] In the examples of this application, see Figure 1 The second oil outlet of the priority valve 4 is connected to the oil inlet of the left chassis proportional valve 9, the first oil outlet and the second oil outlet of the left chassis proportional valve 9 are respectively connected to the first oil inlet and the second oil inlet of the left chassis lifting cylinder 13, and the oil return port of the left chassis proportional valve 9 is connected to the oil return pipeline 17. Figure 1 The first oil outlet and the second oil outlet of the left chassis proportional valve 9 are connected to the first oil inlet and the second oil inlet of the left chassis lifting cylinder 13 through the oil ports A2 and B2 of the electromagnetic multi-way valve 16 respectively.

[0056] In the examples of this application, see Figure 1When the a1 end of the left chassis proportional valve 9 is energized, the left chassis lifting cylinder 13 descends, and the left chassis descends. When the b1 end is energized, the left chassis lifting cylinder 13 ascends, and the left chassis ascends. When a1 and b1 are not energized, the hydraulic lock maintains the pressure on the left chassis lifting cylinder 13, and it can stop at any position within the working stroke. The valve group adopts proportional control, and the cylinder has a built-in stroke sensor, which has better performance for automatic leveling and fine-tuning.

[0057] In the examples of this application, see Figure 1 The second oil outlet of the priority valve 4 is connected to the oil inlet of the right chassis proportional valve 10, the first oil outlet and the second oil outlet of the right chassis proportional valve 10 are respectively connected to the first oil inlet and the second oil inlet of the right chassis lifting cylinder 14, and the oil return port of the right chassis proportional valve 10 is connected to the oil return pipeline 17. Figure 1 The first oil outlet and the second oil outlet of the right chassis proportional valve 10 are connected to the first oil inlet and the second oil inlet of the right chassis lifting cylinder 14 through the oil ports A3 and B3 of the electromagnetic multi-way valve 16 respectively.

[0058] In the examples of this application, see Figure 1 When the a2 end of the right chassis proportional valve 10 is energized, the right chassis lifting cylinder 14 descends, and the right chassis descends. When the b2 end is energized, the right chassis lifting cylinder 14 ascends, and the right chassis ascends. When a2 and b2 are not energized, the hydraulic lock maintains the pressure on the right chassis lifting cylinder 14, and it can stop at any position within the working stroke. The valve group adopts proportional control, and the cylinder has a built-in stroke sensor, which has better performance for automatic leveling and fine-tuning.

[0059] In the examples of this application, see Figure 1 The second oil outlet of the priority valve 4 is connected to the oil inlet of the grain unloading proportional valve 11, the first oil outlet of the grain unloading proportional valve 11 is connected to the oil inlet of the grain unloading oil cylinder 15, and the oil return port of the grain unloading proportional valve 11 is connected to the oil return pipeline 17. Figure 1 The first oil outlet of the grain unloading proportional valve 11 is connected to the oil inlet of the grain unloading oil cylinder 15 through the oil port A4 of the electromagnetic multi-way valve 16.

[0060] In the examples of this application, see Figure 1 When the a3 end of the grain unloading proportional valve 11 is energized, the grain unloading oil cylinder 15 rises and the grain unloading barrel rises. When the b3 end is energized, the grain unloading oil cylinder 15 drops due to gravity and the grain unloading barrel drops. When a3 and b3 are not energized, the hydraulic lock maintains the pressure of the grain unloading oil cylinder 15 and can stop at any position within the working stroke. The valve group adopts proportional control and has good fine-tuning performance.

[0061] As described above, the single pump system of the present application can realize the compound action of the cutting platform action and any one (or multiple) operations of the chassis lifting and lowering, and the grain unloading drum lifting and lowering. Each action is controlled by an independent proportional valve, with precise action control and good micro-control performance, which greatly improves the stability of each action, avoids severe shaking, and improves the handling comfort of the entire vehicle.

[0062] The chassis lifting control logic is as follows:

[0063] The hydraulic system also includes the vehicle controller, left chassis and right chassis. When in manual mode (manual adjustment, the vehicle needs to be powered on):

[0064] like Figure 2 As shown in the figure, the vehicle controller receives the left chassis rise command and immediately determines whether the left chassis has risen to the highest position:

[0065] (1) If it has risen to the highest position (cylinder extension length), the left chassis proportional valve 9 will not operate.

[0066] (2) If it is not yet in the highest position, the left chassis rises and the enable is immediately energized: until it is detected that the left chassis rises to the highest position or the left chassis rising command is not received, the left chassis proportional valve 9 loses power.

[0067] Specifically, when the left chassis rises, the vehicle controller receives a left chassis rising signal, and the vehicle controller sends a signal to the left chassis proportional valve 9. The left chassis proportional valve 9 controls the left chassis lifting cylinder 13 to rise. When the stroke sensor in the left chassis lifting cylinder 13 detects that the extension length of the plug rod (piston rod) exceeds the maximum preset value, the vehicle controller stops sending signals to the left chassis proportional valve 9.

[0068] Similarly, if Figure 2 As shown in the figure, the vehicle controller receives the left chassis lowering command and immediately determines whether the left chassis has dropped to the lowest position:

[0069] (1) If it has descended to the lowest position (cylinder extension length), the left chassis proportional valve 9 will not operate.

[0070] (2) If it is not yet in the lowest position, the left chassis descends and the enable is immediately energized: until it is detected that the left chassis descends to the lowest position or the left chassis descending command is not received, the left chassis proportional valve 9 loses power.

[0071] Specifically, when the left chassis descends, the vehicle controller receives a left chassis descending signal, and the vehicle controller sends a signal to the left chassis proportional valve 9. The left chassis proportional valve 9 controls the left chassis lifting cylinder 13 to descend. When the stroke sensor in the left chassis lifting cylinder 13 detects that the extended length of the plug rod is lower than the minimum predetermined value, the vehicle controller stops sending signals to the left chassis proportional valve 9.

[0072] Similarly, if Figure 3 As shown in the figure, the vehicle controller receives the right chassis rise command and immediately determines whether the right chassis has risen to the highest position:

[0073] (1) If it has risen to the highest position (cylinder extension length), the right chassis proportional valve 10 will not operate.

[0074] (2) If it is not yet in the highest position, the right chassis rises and the enable is immediately energized: until it is detected that the right chassis rises to the highest position or the right chassis rising command is not received, the right chassis proportional valve 10 loses power.

[0075] Specifically, when the right chassis rises, the vehicle controller receives a right chassis rising signal, and the vehicle controller sends a signal to the right chassis proportional valve 10. The right chassis proportional valve 10 controls the right chassis lifting cylinder 14 to rise. When the stroke sensor in the right chassis lifting cylinder 14 detects that the extended length of the plug rod exceeds the maximum preset value, the vehicle controller stops sending signals to the right chassis proportional valve 10.

[0076] Similarly, if Figure 3 As shown in the figure, the vehicle controller receives the right chassis descending command and immediately determines whether the right chassis has descended to the lowest position:

[0077] (1) If it has descended to the lowest position (cylinder extension length), the right chassis proportional valve 10 will not operate.

[0078] (2) If it is not yet in the lowest position, the right chassis descends and the enable is immediately energized: until it is detected that the right chassis descends to the lowest position or the right chassis descending command is not received, the right chassis proportional valve 10 loses power.

[0079] Specifically, when the right chassis descends, the vehicle controller receives a right chassis descending signal, and the vehicle controller sends a signal to the right chassis proportional valve 10. The right chassis proportional valve 10 controls the right chassis lifting cylinder 14 to descend. When the stroke sensor in the right chassis lifting cylinder 14 detects that the extended length of the plug rod is lower than the minimum predetermined value, the vehicle controller stops sending signals to the right chassis proportional valve 10.

[0080] Similarly, if Figure 4As shown, when the vehicle controller receives the command for the left chassis to rise and the right chassis to fall: the vehicle controller receives the left chassis rising signal and the right chassis falling signal; the vehicle controller sends a signal to the left chassis proportional valve 9, and the left chassis proportional valve 9 controls the left chassis lifting cylinder 13 to rise. When the stroke sensor in the left chassis lifting cylinder 13 detects that the extended length of the plug rod exceeds the maximum predetermined value, the vehicle controller stops sending signals to the left chassis proportional valve 9; at the same time, the vehicle controller sends a signal to the right chassis proportional valve 10, and the right chassis proportional valve 10 controls the right chassis lifting cylinder 14 to descend. When the stroke sensor in the right chassis lifting cylinder 14 detects that the extended length of the plug rod is lower than the minimum predetermined value, the vehicle controller stops sending signals to the right chassis proportional valve 10.

[0081] Similarly, when the vehicle controller receives the instruction to lower the left chassis and raise the right chassis: the vehicle controller receives the left chassis lowering signal and the right chassis raising signal; the vehicle controller sends a signal to the left chassis proportional valve 9, and the left chassis proportional valve 9 controls the left chassis lifting cylinder 13 to lower, and when the stroke sensor in the left chassis lifting cylinder 13 detects that the extended length of the plug rod is lower than the minimum preset value, the vehicle controller stops sending signals to the left chassis proportional valve 9; at the same time, the vehicle controller sends a signal to the right chassis proportional valve 10, and the right chassis proportional valve 10 controls the right chassis lifting cylinder 14 to rise, and when the stroke sensor in the right chassis lifting cylinder 14 detects that the extended length of the plug rod exceeds the maximum preset value, the vehicle controller stops sending signals to the right chassis proportional valve 10.

[0082] like Figure 5 As shown, when in manual mode, the chassis is raised and the body inclination is adjusted:

[0083] (1) If the difference between the left and right cylinder stroke sensor values ​​is greater than 10 mm, the chassis on the crawler track on the side with the smaller cylinder stroke sensor value will be raised, and the corresponding proportional valve will be opened to perform the lifting operation. Before the lifting reaches the highest position, the difference between the left and right cylinder stroke sensor values ​​can be ≤10 mm. The current rising proportional valve will be powered off and stop output, and then the chassis will be lifted simultaneously.

[0084] (2) If the difference between the left and right cylinder stroke sensor values ​​is ≤10mm, the chassis will be lifted simultaneously.

[0085] Specifically, when the left chassis and the right chassis rise at the same time, the vehicle controller receives a signal that the left chassis and the right chassis rise at the same time. If the difference between the extended length of the plug rod in the left chassis lifting cylinder 13 and the extended length of the plug rod in the right chassis lifting cylinder 14 is greater than 10 mm, the vehicle controller controls the left chassis lifting cylinder 13 or the right chassis lifting cylinder 14 with the smaller extended length of the plug rod to rise until the difference between the extended length of the plug rod in the left chassis lifting cylinder 13 and the extended length of the plug rod in the right chassis lifting cylinder 14 is ≤10 mm.

[0086] If the difference between the extended length of the plug rod in the left chassis lifting cylinder 13 and the extended length of the plug rod in the right chassis lifting cylinder 14 is ≤10mm, the vehicle controller controls and sends a signal to the left chassis proportional valve 9 and the right chassis proportional valve 10, and the left chassis proportional valve 9 and the right chassis proportional valve 10 control the left chassis lifting cylinder 13 and the right chassis lifting cylinder 14 to rise simultaneously;

[0087] During the simultaneous lifting of the left chassis and the right chassis, if the difference between the extended length of the plug rod in the left chassis lifting cylinder 13 and the extended length of the plug rod in the right chassis lifting cylinder 14 is greater than 10mm, the vehicle controller stops sending signals to the left chassis proportional valve 9 and the right chassis proportional valve 10, and then the vehicle controller controls the left chassis lifting cylinder 13 or the right chassis lifting cylinder 14 with the smaller extended length of the plug rod to rise until the difference between the extended length of the plug rod in the left chassis lifting cylinder 13 and the extended length of the plug rod in the right chassis lifting cylinder 14 is ≤10mm.

[0088] Similarly, when in manual mode, the chassis is lowered and the body inclination is adjusted:

[0089] (1) If the difference between the left and right cylinder stroke sensor values ​​is greater than 10mm, the chassis on the crawler track on the side with the larger cylinder stroke sensor value will be lowered, and the corresponding proportional valve will be opened to perform the lowering operation. Before descending to the lowest position, the difference between the left and right cylinder stroke sensor values ​​can be ≤10mm. The current descending proportional valve will be powered off and stop output, and then the chassis will be lowered together.

[0090] (2) If the difference between the left and right cylinder stroke sensor values ​​is ≤10mm, the chassis will be lowered directly.

[0091] Specifically, when the left chassis and the right chassis are lowered at the same time, the vehicle controller receives the left chassis and the right chassis lowering signals at the same time. If the difference between the extended length of the plug rod in the left chassis lifting cylinder 13 and the extended length of the plug rod in the right chassis lifting cylinder 14 is greater than 10 mm, the vehicle controller controls the left chassis lifting cylinder 13 or the right chassis lifting cylinder 14 with the larger extended length of the plug rod to be lowered until the difference between the extended length of the plug rod in the left chassis lifting cylinder 13 and the extended length of the plug rod in the right chassis lifting cylinder 14 is ≤10 mm.

[0092] If the difference between the extended length of the plug rod in the left chassis lifting cylinder 13 and the extended length of the plug rod in the right chassis lifting cylinder 14 is ≤10mm, the vehicle controller controls and sends a signal to the left chassis proportional valve 9 and the right chassis proportional valve 10, and the left chassis proportional valve 9 and the right chassis proportional valve 10 control the left chassis lifting cylinder 13 and the right chassis lifting cylinder 14 to descend at the same time;

[0093] During the simultaneous lowering of the left chassis and the right chassis, if the difference between the extended length of the plug rod in the left chassis lifting cylinder 13 and the extended length of the plug rod in the right chassis lifting cylinder 14 is greater than 10mm, the vehicle controller stops sending signals to the left chassis proportional valve 9 and the right chassis proportional valve 10, and then the vehicle controller controls the left chassis lifting cylinder 13 or the right chassis lifting cylinder 14 with a larger extended length of the plug rod to descend until the difference between the extended length of the plug rod in the left chassis lifting cylinder 13 and the extended length of the plug rod in the right chassis lifting cylinder 14 is ≤10mm.

[0094] When in automatic mode, the main clutch is engaged and the automatic mode button is pressed, the default left and right chassis automatic leveling mode is automatically turned on. The chassis is automatically leveled left and right (main clutch is engaged: seed speed and residual speed>100).

[0095] like Figure 6 As shown, when the left chassis and the right chassis are automatically leveled, the vehicle controller receives the left chassis and the right chassis automatic leveling signal, and if the vehicle body is tilted >3°, the vehicle controller controls the left chassis lifting cylinder 13 or the right chassis lifting cylinder 14 on the higher side of the vehicle body to descend, and if the vehicle body is tilted ≤3° when the left chassis lifting cylinder 13 or the right chassis lifting cylinder 14 on the higher side of the vehicle body descends to a certain position, the automatic leveling is completed (in other words, if the vehicle body is tilted ≤3° during the descent of the left chassis lifting cylinder 13 or the right chassis lifting cylinder 14 on the higher side of the vehicle body, the automatic leveling is completed).

[0096] If the body tilt is still greater than 3° when the left chassis lifting cylinder 13 or the right chassis lifting cylinder 14 on the higher side of the body descends to the lowest position, the vehicle controller controls the left chassis lifting cylinder 13 or the right chassis lifting cylinder 14 on the lower side of the body to rise; if the body tilt is ≤3° when the left chassis lifting cylinder 13 or the right chassis lifting cylinder 14 on the lower side of the body rises to a certain position, automatic leveling is completed.

[0097] A second aspect of the present application provides a rice machine, comprising the hydraulic system as described above.

[0098] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that any technician familiar with this technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed in the present application, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered by the protection scope of the present application.

Claims

1. A hydraulic system, characterized in that: The hydraulic system includes a pump body, a priority valve, a header oil cylinder, a left chassis lifting oil cylinder, a right chassis lifting oil cylinder, a grain unloading oil cylinder, a first header proportional valve, a second header proportional valve, a left chassis proportional valve, a right chassis proportional valve and a grain unloading proportional valve; The pump body is connected to the oil inlet of the priority valve, the first oil outlet of the priority valve is connected to the oil inlet of the header cylinder through the first header proportional valve, and the second header proportional valve is connected between the oil inlet of the header cylinder and the oil return pipeline; The second oil outlet of the priority valve is respectively connected to the left chassis proportional valve, the right chassis proportional valve and the grain unloading proportional valve; the left chassis proportional valve is connected to the left chassis lifting cylinder; the right chassis proportional valve is connected to the right chassis lifting cylinder; and the grain unloading proportional valve is connected to the grain unloading oil cylinder.

2. The hydraulic system according to claim 1, characterized in that: The left chassis proportional valve, the right chassis proportional valve and the grain unloading proportional valve are all three-position four-way valves; The second oil outlet of the priority valve is connected to the oil inlet of the left chassis proportional valve, the first oil outlet and the second oil outlet of the left chassis proportional valve are respectively connected to the first oil inlet and the second oil inlet of the left chassis lifting cylinder, and the oil return port of the left chassis proportional valve is connected to the oil return pipeline; The second oil outlet of the priority valve is connected to the oil inlet of the right chassis proportional valve, the first oil outlet and the second oil outlet of the right chassis proportional valve are respectively connected to the first oil inlet and the second oil inlet of the right chassis lifting cylinder, and the oil return port of the right chassis proportional valve is connected to the oil return pipeline; The second oil outlet of the priority valve is connected to the oil inlet of the grain unloading proportional valve, the first oil outlet of the grain unloading proportional valve is connected to the oil inlet of the grain unloading oil cylinder, and the oil return port of the grain unloading proportional valve is connected to the oil return pipeline.

3. The hydraulic system according to claim 1, characterized in that: The hydraulic system also includes a pressure compensator; The first oil inlet and the second oil inlet of the pressure compensator are respectively connected to the pump body and the oil outlet of the second header proportional valve, and the oil return port of the pressure compensator is connected to the oil return pipeline.

4. The hydraulic system according to claim 1, characterized in that: The hydraulic system also includes a vehicle controller, a left chassis and a right chassis. When in manual mode, When the left chassis rises, the vehicle controller receives a left chassis rising signal, and the vehicle controller sends a signal to the left chassis proportional valve, and the left chassis proportional valve controls the left chassis lifting cylinder to rise. When the stroke sensor in the left chassis lifting cylinder detects that the extended length of the plug rod exceeds a maximum predetermined value, the vehicle controller stops sending signals to the left chassis proportional valve; When the left chassis is lowered, the vehicle controller receives a left chassis lowering signal, and the vehicle controller sends a signal to the left chassis proportional valve, and the left chassis proportional valve controls the left chassis lifting cylinder to lower. When the stroke sensor in the left chassis lifting cylinder detects that the extended length of the plug rod is lower than a minimum predetermined value, the vehicle controller stops sending signals to the left chassis proportional valve; When the right chassis rises, the vehicle controller receives a right chassis rising signal, and the vehicle controller sends a signal to the right chassis proportional valve, and the right chassis proportional valve controls the right chassis lifting cylinder to rise. When the stroke sensor in the right chassis lifting cylinder detects that the extension length of the plug rod exceeds the maximum predetermined value, the vehicle controller stops sending signals to the right chassis proportional valve; When the right chassis descends, the vehicle controller receives a right chassis descending signal, and the vehicle controller sends a signal to the right chassis proportional valve. The right chassis proportional valve controls the right chassis lifting cylinder to descend. When the stroke sensor in the right chassis lifting cylinder detects that the extended length of the plug rod is lower than the minimum preset value, the vehicle controller stops sending signals to the right chassis proportional valve.

5. The hydraulic system according to claim 4, characterized in that: When in manual mode, When the left chassis rises and the right chassis falls, the vehicle controller receives a left chassis rising signal and a right chassis falling signal; the vehicle controller sends a signal to the left chassis proportional valve, and the left chassis proportional valve controls the left chassis lifting cylinder to rise. When the stroke sensor in the left chassis lifting cylinder detects that the extended length of the plug rod exceeds the maximum predetermined value, the vehicle controller stops sending signals to the left chassis proportional valve; at the same time, the vehicle controller sends a signal to the right chassis proportional valve, and the right chassis proportional valve controls the right chassis lifting cylinder to fall. When the stroke sensor in the right chassis lifting cylinder detects that the extended length of the plug rod is lower than the minimum predetermined value, the vehicle controller stops sending signals to the right chassis proportional valve; When the left chassis descends and the right chassis rises, the vehicle controller receives a left chassis descending signal and a right chassis rising signal; the vehicle controller sends a signal to the left chassis proportional valve, and the left chassis proportional valve controls the left chassis lifting cylinder to descend. When the stroke sensor in the left chassis lifting cylinder detects that the extended length of the plug rod is lower than the minimum preset value, the vehicle controller stops sending signals to the left chassis proportional valve; at the same time, the vehicle controller sends a signal to the right chassis proportional valve, and the right chassis proportional valve controls the right chassis lifting cylinder to rise. When the stroke sensor in the right chassis lifting cylinder detects that the extended length of the plug rod exceeds the maximum preset value, the vehicle controller stops sending signals to the right chassis proportional valve.

6. The hydraulic system according to claim 4, characterized in that: When in manual mode, When the left chassis and the right chassis rise simultaneously, the vehicle controller receives a signal indicating that the left chassis and the right chassis rise simultaneously. If the difference between the extended length of the plug rod in the left chassis lifting oil cylinder and the extended length of the plug rod in the right chassis lifting oil cylinder is greater than 10 mm, the vehicle controller controls the left chassis lifting oil cylinder or the right chassis lifting oil cylinder with the smaller extended length of the plug rod to rise until the difference between the extended length of the plug rod in the left chassis lifting oil cylinder and the extended length of the plug rod in the right chassis lifting oil cylinder is ≤10 mm; If the difference between the extended length of the plug rod in the left chassis lifting cylinder and the extended length of the plug rod in the right chassis lifting cylinder is ≤10mm, the vehicle controller controls to send a signal to the left chassis proportional valve and the right chassis proportional valve, and the left chassis proportional valve and the right chassis proportional valve control the left chassis lifting cylinder and the right chassis lifting cylinder to rise simultaneously; During the simultaneous ascent of the left chassis and the right chassis, if the difference between the extended length of the plug rod in the left chassis lifting cylinder and the extended length of the plug rod in the right chassis lifting cylinder is greater than 10 mm, the vehicle controller stops sending signals to the left chassis proportional valve and the right chassis proportional valve, and then the vehicle controller controls the left chassis lifting cylinder or the right chassis lifting cylinder with the smaller extended length of the plug rod to rise until the difference between the extended length of the plug rod in the left chassis lifting cylinder and the extended length of the plug rod in the right chassis lifting cylinder is ≤10 mm.

7. The hydraulic system according to claim 4, characterized in that: When in manual mode, When the left chassis and the right chassis are lowered at the same time, the vehicle controller receives a signal indicating that the left chassis and the right chassis are lowered at the same time. If the difference between the extended length of the plug rod in the left chassis lifting oil cylinder and the extended length of the plug rod in the right chassis lifting oil cylinder is greater than 10 mm, the vehicle controller controls the left chassis lifting oil cylinder or the right chassis lifting oil cylinder with the larger extended length of the plug rod to descend until the difference between the extended length of the plug rod in the left chassis lifting oil cylinder and the extended length of the plug rod in the right chassis lifting oil cylinder is ≤10 mm; If the difference between the extended length of the plug rod in the left chassis lifting cylinder and the extended length of the plug rod in the right chassis lifting cylinder is ≤10mm, the vehicle controller controls to send a signal to the left chassis proportional valve and the right chassis proportional valve, and the left chassis proportional valve and the right chassis proportional valve control the left chassis lifting cylinder and the right chassis lifting cylinder to descend simultaneously; During the simultaneous lowering of the left chassis and the right chassis, if the difference between the extended length of the plug rod in the left chassis lifting cylinder and the extended length of the plug rod in the right chassis lifting cylinder is greater than 10 mm, the vehicle controller stops sending signals to the left chassis proportional valve and the right chassis proportional valve, and then the vehicle controller controls the left chassis lifting cylinder or the right chassis lifting cylinder with the larger extended length of the plug rod to descend until the difference between the extended length of the plug rod in the left chassis lifting cylinder and the extended length of the plug rod in the right chassis lifting cylinder is ≤10 mm.

8. The hydraulic system according to claim 4, characterized in that: When in automatic mode, When the left chassis and the right chassis are automatically leveled, the vehicle controller receives the automatic leveling signal of the left chassis and the right chassis, and if the vehicle body is tilted more than 3°, the vehicle controller controls the left chassis lifting cylinder or the right chassis lifting cylinder on the higher side of the vehicle body to descend, and if the left chassis lifting cylinder or the right chassis lifting cylinder on the higher side of the vehicle body descends to a certain position and the vehicle body is tilted ≤3°, the automatic leveling is completed.

9. The hydraulic system according to claim 8, characterized in that: When in automatic mode, If the vehicle body tilts more than 3°, the vehicle controller controls the left chassis lifting cylinder or the right chassis lifting cylinder on the higher side of the vehicle body to descend. If the left chassis lifting cylinder or the right chassis lifting cylinder on the higher side of the vehicle body descends to a certain position and the vehicle body tilts ≤3°, automatic leveling is completed; If the body tilt is still greater than 3° when the left chassis lifting cylinder or the right chassis lifting cylinder on the higher side of the body descends to the lowest position, the vehicle controller controls the left chassis lifting cylinder or the right chassis lifting cylinder on the lower side of the body to rise; if the body tilt is ≤3° when the left chassis lifting cylinder or the right chassis lifting cylinder on the lower side of the body rises to a certain position, automatic leveling is completed.

10. A rice machine, characterized in that: Comprising the hydraulic system as claimed in any one of claims 1-9.

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