Header lifting and gearbox electric control gear shifting hydraulic control system and agricultural machine

Abstract

The invention relates to the technical field of hydraulic systems of agricultural machinery, in particular to a hydraulic control system for header lifting and gearbox electric control gear shifting and the agricultural machinery. A gear pump and a header of the hydraulic control system are communicated with a gear shifting oil way switching valve group; the header and the gear shifting oil way switching valve group are respectively communicated with the header lifting oil cylinder control electromagnetic valve group and the oil switching valve group, so that hydraulic oil enters the header lifting oil cylinder control electromagnetic valve group or the oil switching valve group; the header lifting oil cylinder controls the electromagnetic valve set to be connected with the header and controls the header to ascend and descend. The oil switching valve set communicates with the gearbox gear shifting control valve set, and the gearbox gear shifting control valve set is used for switching gears of the walking gearbox. By means of the hydraulic system, electric proportional control over the lifting speed of the header can be achieved, the electric control gear shifting function of the walking gearbox can also be achieved, and the hydraulic system is simple in structure, excellent in performance and efficient and rapid to control.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic systems for agricultural machinery, and in particular to a hydraulic control system for lifting and lowering a cutting platform and electronically controlled shifting of a gearbox, and agricultural machinery. Background Art

[0002] At present, most of the lifting and lowering of the harvesting header of agricultural machinery are powered by a gear pump, which provides pressure oil to the solenoid valve, which controls the rise and fall of the header lifting cylinder. Most of the solenoid valves are plate-type assembly valves. Harvesting headers of different weights require matching throttle holes of different sizes to control the rising and falling speeds. If the same machine needs to be connected to harvesting headers of different specifications, the throttle holes inside the solenoid valve need to be frequently replaced, which is troublesome to operate and wastes hydraulic oil. In addition, the shifting mechanism of the current agricultural machinery, especially the travel gearbox of the harvesting machinery, is mostly mechanical shifting, which is time-consuming and labor-intensive. Summary of the Invention The purpose of this application is to provide a hydraulic control system for cutting platform lifting and gearbox electronic shifting and agricultural machinery, which can not only realize the electric proportional control of the cutting platform lifting speed, but also realize the electronic shifting function of the walking gearbox. It has a simple structure and is more efficient and quick to operate.

[0003] In a first aspect, the present application provides a hydraulic control system for header lifting and transmission electronic shifting, comprising a gear pump, a hydraulic oil tank, a header and shift oil circuit switching valve group, a header lifting cylinder control solenoid valve group, an oil switching valve group, and a transmission shift control valve group; The inlet end of the gear pump is communicated with the hydraulic oil tank, and the outlet end of the gear pump is communicated with the header and the shift oil circuit switching valve group; The header and shift oil circuit switching valve group are respectively connected to the header lifting oil cylinder control solenoid valve group and the oil switching valve group, so that the hydraulic oil enters the header lifting oil cylinder control solenoid valve group or the oil switching valve group; The solenoid valve group for controlling the lifting of the cutting platform is connected to the cutting platform and controls the lifting of the cutting platform. The solenoid valve group for controlling the lifting of the cutting platform comprises a first electro-hydraulic proportional valve, a second electro-hydraulic proportional valve and a hydraulic relief valve. The lifting speed of the cutting platform is adjusted by controlling the electric proportional opening of the first electro-hydraulic proportional valve and the second electro-hydraulic proportional valve, and the relief pressure of the hydraulic relief valve is adjusted to adapt to various models of cutting platforms. The oil switching valve group is connected to the gearbox shift control valve group, and the gearbox shift control valve group is used to switch the gear position of the travel gearbox; The oil return ports of the cutting platform and shift oil circuit switching valve group, the cutting platform lifting cylinder control solenoid valve group, the oil switching valve group and the transmission shift control valve group are all connected to the hydraulic oil tank.

[0004] In a preferred embodiment, it further comprises a liquid-filled brake valve group; the oil switching valve group is also communicated with the liquid-filled brake valve group; The liquid-filled brake valve group is communicated with the first accumulator, the parking brake and the foot brake system respectively.

[0005] In a preferred embodiment, a first pressure sensor is further included, which can detect the internal pressure of the liquid-charging brake valve group; when the pressure value detected by the first pressure sensor is lower than a preset value, the solenoid valve in the liquid-charging brake valve group is controlled to open to charge the first accumulator.

[0006] In a preferred embodiment, the header lifting oil cylinder control solenoid valve group further includes a second accumulator for maintaining the header pressure and buffering the header lifting.

[0007] In a preferred embodiment, the header lifting oil cylinder control solenoid valve group further includes a second pressure sensor, and the second pressure sensor is used to detect the internal pressure of the header lifting oil cylinder control solenoid valve group.

[0008] In a second aspect, the present application provides an agricultural machine, including the aforementioned hydraulic control system for raising and lowering a header and electronically shifting a gearbox, as well as a header, an engine, a transfer case, and a travel gearbox; The transfer case is connected to the flywheel of the engine via a flexible connection plate, and the gear pump is connected to the drive port of the transfer case via a spline and is fixed to the transfer case; The cutting platform lifting cylinder control solenoid valve group is connected to the cutting platform and controls the lifting of the cutting platform; the transmission shift control valve group is used to switch the gear position of the travel transmission.

[0009] In a preferred embodiment, a liquid-filled brake valve group is further included; the oil switching valve group is also connected to the liquid-filled brake valve group.

[0010] In a preferred embodiment, the hydraulic oil tank, the header and shift oil circuit switching valve group, the header lifting cylinder control solenoid valve group, the oil switching valve group and the liquid filling brake valve group are all fixed to the frame by bolts.

[0011] In a preferred embodiment, the transmission shift control valve group is installed on the upper part of the travel transmission case, and the travel transmission is fixed to the front axle pipe beam of the frame by bolts.

[0012] In a preferred embodiment, it further comprises a controller, an operating mechanism and a display screen arranged in the cab; The controller is electrically connected to the gear pump, the header and shift oil circuit switching valve group, the header lifting cylinder control solenoid valve group, the oil switching valve group, the liquid filling brake valve group, the transmission shift control valve group and the operating mechanism respectively; The display screen is used to display the status of the cutting platform and the travel gearbox.

[0013] Compared with the prior art, this application has the following beneficial effects: This application uses a hydraulic system to achieve both electric proportional control of the cutting platform lifting speed and the electronically controlled shifting function of the travel gearbox. The hydraulic system has a simple structure, excellent performance, and efficient and fast control. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0015] Figure 1 A schematic diagram of the piping connections between the header lifting and transmission electronic shifting hydraulic control system provided in an embodiment of the present application; Figure 2 A hydraulic principle diagram of the header lifting and gearbox electronic shifting hydraulic control system provided in an embodiment of the present application; Figure 3 This is the hydraulic principle diagram of the liquid-filled brake valve group; Figure 4 This is the hydraulic principle diagram of the oil switching valve group; Figure 5 Hydraulic schematic diagram of the gearbox shift control valve group Figure 6 Hydraulic principle diagram of the header and shift oil circuit switching valve group Figure 7 This is the hydraulic principle diagram of the solenoid valve group that controls the header lifting cylinder; Reference numerals: 1-transfer case; 2-gear pump; 3-hydraulic oil tank; 4-liquid-filled brake valve group; 5-oil switching valve group; 6-travel gearbox; 7-gearbox shift control valve group; 8-cutting platform and shift oil circuit switching valve group; 9-cutting platform lift cylinder control solenoid valve group; 10-cutting platform left lift cylinder; 11-cutting platform right lift cylinder; 12-parking brake; 13-first pressure sensor; 14-first accumulator; 15-locking cylinder; 16-first gear shift cylinder; 17-second and third gear shift cylinders. DETAILED DESCRIPTION

[0016] The following specific embodiments are provided to help the reader gain 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 specific order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, for the purpose of improving clarity and brevity, descriptions of features known in the art may be omitted. The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. More specifically, 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. Throughout this specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bound to" another element, "over" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bound to" another element, "over" another element, or "covering" another element, or there may be one or more other elements between them. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bound to" another element, "directly over" another element, or "directly covering" another element, there may be no other elements between them. As used herein, the term "and / or" includes any one of the listed related items and any combination of any two or more items. Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or parts, these members, components, regions, layers, or parts are not limited by these terms. More precisely, these terms are only used to distinguish a member, component, region, layer or part from another member, component, region, layer or part. Therefore, without departing from the teaching of the example, the first member, component, region, layer or part referred to in the example described here may also be referred to as the second member, component, region, layer or part. For ease of description, spatial relationship terms such as "above...", "upper...", "below..." and "lower" can be used here to describe the relationship between an element and another element as shown in the drawings. Such spatial relationship terms are intended to include different orientations of the device in use or operation in addition to being included in the orientation depicted in the drawings. For example, if the device in the drawings is flipped, the element described as being "above" or "upper" relative to another element will then be "below" or "lower" relative to another element.Therefore, the term "above" encompasses both "above" and "below," 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 relationship terms used herein will be interpreted accordingly. The terms used herein are intended to describe various examples only and are not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular is intended to include the plural. The terms "comprising," "including," and "having" enumerate the presence of stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof. Variations from 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 and include variations in shape that may occur during manufacturing. The features of the examples described herein may be combined in various ways that will become apparent upon understanding the disclosure of this application. Furthermore, while the examples described herein have various configurations, other configurations are possible, as will become apparent upon understanding the disclosure of this application.

[0017] like Figures 1 to 7 As shown, the hydraulic control system for header lifting and transmission electronic shifting provided in this embodiment includes a gear pump 2, a hydraulic oil tank 3, a header and shift oil circuit switching valve group 8, a header lifting cylinder control solenoid valve group 9, an oil switching valve group 5 and a transmission shift control valve group 7; The inlet end of the gear pump 2 is connected to the hydraulic oil tank 3, so that the gear pump 2 can draw hydraulic oil from the hydraulic oil tank 3, and the outlet end of the gear pump 2 is connected to the header and shift oil circuit switching valve group 8; The header and shift oil circuit switching valve group 8 are respectively connected to the header lifting oil cylinder control solenoid valve group 9 and the oil switching valve group 5, so that the hydraulic oil enters the header lifting oil cylinder control solenoid valve group 9 or the oil switching valve group 5; The header lifting cylinder control solenoid valve group 8 is connected to the header left lifting cylinder 10 and the header right lifting cylinder 11, and controls the header lifting by controlling the extension and retraction of the header left lifting cylinder 10 and the header right lifting cylinder 11.

[0018] The header lift cylinder control solenoid valve assembly 9 includes a first electro-hydraulic proportional valve F51, a second electro-hydraulic proportional valve F54, and a hydraulic relief valve F59. The lifting speed of the header is adjusted by controlling the proportional opening of the first and second electro-hydraulic proportional valves F51 and F54, while the relief pressure of the hydraulic relief valve F59 is adjusted to accommodate various header models. An electro-hydraulic proportional valve is a hydraulic control device whose core component is a proportional solenoid. Its function is to convert an input electrical signal (current or voltage) into mechanical force or displacement. When an electrical signal is input, the solenoid generates an electromagnetic force proportional to the current, displacing the valve core, achieving a linear conversion from electrical signal to mechanical motion. The displacement of the valve core directly controls the opening degree of the hydraulic channel, thereby regulating flow, pressure, or direction. For example, by adjusting the valve core position, the opening pressure of a relief or pressure reducing valve is altered, achieving continuous control of system pressure. Valve core displacement also changes the orifice area, thereby controlling fluid flow.

[0019] The oil switching valve group 5 is in communication with the transmission shift control valve group 7, which is used to switch the gears of the travel transmission 6. The system also includes a fluid charging brake valve group 4. The oil switching valve group 5 is also in communication with the fluid charging brake valve group 4, which is in communication with the first accumulator 14, the first pressure sensor 13, the parking brake 12, and the service brake system.

[0020] The return oil ports of the cutting platform and shift oil circuit switching valve group 8, the cutting platform lifting cylinder control solenoid valve group 9, the liquid charging brake valve group 4, the oil switching valve group 5 and the transmission shift control valve group 7 are all connected to the hydraulic oil tank 3.

[0021] When working, the gear pump 2 sucks hydraulic oil from the hydraulic oil tank 3 and supplies the pressure oil to the P0 port of the header and the shift oil circuit switching valve group 8.

[0022] When the header lifting cylinder control solenoid valve group 9 is energized and responds, the pressure oil enters the P7 port of the header lifting cylinder control solenoid valve group 9 through the P2 port of the header and shift oil circuit switching valve group 8, and then passes through the first electro-hydraulic proportional valve F51 and the one-way valve F55 integrated in the header lifting cylinder control solenoid valve group 9, through the oil port WP, and enters the three-way joint body to be diverted into the oil inlet of the header left lifting cylinder 10 and the oil inlet of the header right lifting cylinder 11, thereby extending the cylinder piston and lifting the harvesting header to the required height; the hydraulic oil coming out of the header left lifting cylinder 10 and the header right lifting cylinder 11 are merged through the three-way joint body and enter the hydraulic oil tank 3.

[0023] The lifting speed of the harvesting platform can be adjusted by the size of the electro-proportional opening of the first electro-hydraulic proportional valve F51. The larger the opening, the faster the lifting speed. The overflow pressure of the valve block is adjusted by the hydraulic overflow valve F59 to meet the needs of different harvesting platforms. The excess oil entering the harvesting platform lifting cylinder controls the solenoid valve group 9 and is returned to the hydraulic oil tank 3 after being merged with the return oil port T1 of the valve block.

[0024] When the harvesting header lowers, the second electro-hydraulic proportional valve F54, integrated within the header lift cylinder's control solenoid valve assembly 9, is energized and opens. The hydraulic oil in the cylinder flows through this second electro-hydraulic proportional valve F54 into the oil return port T1, where it then rejoins and flows back into the hydraulic oil tank 3. The header's descent speed is controlled by adjusting the electrically proportional opening of the valve core within this second electro-hydraulic proportional valve F54; a wider opening increases the speed of descent.

[0025] The hydraulic oil port ACC of the header lift cylinder control solenoid valve group 9 is connected to a second accumulator, which maintains the pressure of the header and acts as a buffer when the header rises and falls; the hydraulic oil port WPS of the header lift cylinder control solenoid valve group 9 can be connected to a second pressure sensor to detect the pressure value inside the header lift cylinder control solenoid valve group 9 when the header is raised or lowered, so as to reasonably match the charging pressure value of the second accumulator and the overflow pressure value of the hydraulic overflow valve F59.

[0026] When the QM7 end of the solenoid valve F21 in the oil switching valve group 5 is energized in response, the pressure oil enters the P5 port of the charging brake valve group 4 through the A1 port to complete the charging of the first accumulator 14. The first pressure sensor 13 detects the internal pressure of the charging brake valve group 4. When the pressure value of the first accumulator 14 is lower than the set value, the QM7 end of the solenoid valve F21 is energized to complete the charging of the first accumulator 14.

[0027] The oil port BK is connected to the parking brake 12, which is used to hold the front wheels of the agricultural machinery tightly when parking to prevent the vehicle from slipping; the oil port A2 can be connected to the foot brake system of the agricultural machinery to brake the vehicle during movement; the excess oil during the filling process returns to the hydraulic oil tank 3 through the P4 port; the oil released by the parking brake 12 during the parking process returns to the hydraulic oil tank 3 through the T1 port.

[0028] When the QM6 end of the solenoid valve F21 in the oil switching valve group 5 is energized and responds, the pressurized oil enters the oil inlet P6 of the transmission shift control valve group 7 through the B port. Under the on-off action of the solenoid valves in the transmission shift control valve group 7, the switching between the three gears of the locking cylinder 15, the first gear shift cylinder 16 and the second and third gear shift cylinders 17 is completed, and the excess oil returns to the hydraulic oil tank 3 through the T2 port.

[0029] The internal pressure of the oil switching valve group 5 can be set by the internal overflow valve F22. When the QM7 and QM6 ends of the solenoid valve F21 are not energized, the excess hydraulic oil returns to the hydraulic oil tank 3 through the T2 port of the oil switching valve group 5.

[0030] This embodiment also provides an agricultural machine equipped with the harvesting platform lifting and transmission electronically controlled shifting hydraulic control system.

[0031] In addition to the header lifting and gearbox electric control shifting hydraulic control system, the agricultural machine further comprises a header, an engine, a transfer case and a travel gearbox.

[0032] The transfer case 1 is connected to the engine of the agricultural machine, the flexible connection disc of the transfer case 1 is connected with the flywheel of the engine, and the power output of the engine is output to the driving port of the transfer case 1; the gear pump 2 is connected with the driving port of the transfer case 1 through a spline and is fixed to the transfer case 1 through bolts; the hydraulic oil tank 3, the header, the shift oil way switching valve group 8, the header lifting oil cylinder control solenoid valve group 9, the oil liquid switching valve group 5 and the liquid filling brake valve group 4 are fixed on the frame of the agricultural machine through bolts; one end of the header left lifting oil cylinder 10 and the header right lifting oil cylinder 11 are respectively connected with the frame of the agricultural machine through a pin shaft, and the other end is connected with the overbridge of the agricultural machine through a pin shaft, and the harvesting header is hung above the overbridge. When the header left lifting oil cylinder 10 and the header right lifting oil cylinder 11 act, the header is driven to rise and fall together; the gearbox shifting control valve group 7 is installed on the upper part of the box body of the travel gearbox 6, the travel gearbox 6 is fixed to the front axle pipe beam of the agricultural machine through bolts, the left and right reducers of the travel gearbox 6 are connected with the drive tires, and the travel gearbox 6 provides driving force through a hydraulic motor to drive the agricultural machine to move forward or backward.

[0033] Further comprising a controller, a control mechanism and a display screen arranged in the cab; The controller is electrically connected with the gear pump 2, the header and the shift oil way switching valve group 8, the header lifting oil cylinder control solenoid valve group 9, the oil liquid switching valve group 5, the liquid filling brake valve group 4, the gearbox shifting control valve group 7 and the control mechanism respectively; The display screen is used to display the state of the header and the travel gearbox.

[0034] The five groups of solenoid valves provided in the system are controlled by the controller, and the driver can accurately control and observe the working state of the header lifting and the travel gearbox 6 shifting through the control mechanism and the display screen in the cab.

[0035] The embodiment has the following technical effects: 1. The header lifting and gearbox electric control shifting hydraulic control system realizes multiple complex functions by reducing the number of pump bodies, facilitates the reasonable layout of the hydraulic pipeline in the narrow space of the agricultural machine, and improves the compactness and aesthetics of the whole machine structure.

[0036] 2. The header lifting and gearbox electric control shifting hydraulic control system respectively integrates multiple hydraulic elements in each valve block, can adapt to the pressure and flow demand of different functional modules, effectively reduces energy consumption, is convenient to adjust, has good adaptability and high utilization rate.

[0037] 3. This hydraulic control system for header lifting and gearbox electronic shifting can accurately control the rising and lowering speed of the harvesting header in electric proportion. When attaching harvesting headers of different specifications and weights, the operator only needs to select the electric proportional opening for rising and lowering on the display screen in the cab. The adjustment is very convenient and quick.

[0038] 4. This hydraulic control system for header lifting and transmission electronic shifting only requires the operator to select different gear buttons in the cab to accurately realize electronic shifting and parking of the travel transmission. It is simple to operate, has a high shift success rate, and is safe and quick to use. 5. This hydraulic control system for header lifting and transmission electronic shifting has a simple structure, is easy to maintain, and is more efficient and quick to operate. It has a wide range of applications, a stable system, and a low failure rate.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A hydraulic control system for header lifting and gearbox electronic shifting, characterized in that: It includes a gear pump, a hydraulic oil tank, a header and shift oil circuit switching valve group, a header lifting cylinder control solenoid valve group, an oil switching valve group and a transmission shift control valve group; The inlet end of the gear pump is communicated with the hydraulic oil tank, and the outlet end of the gear pump is communicated with the header and the shift oil circuit switching valve group; The header and shift oil circuit switching valve group are respectively connected to the header lifting oil cylinder control solenoid valve group and the oil switching valve group, so that the hydraulic oil enters the header lifting oil cylinder control solenoid valve group or the oil switching valve group; The solenoid valve group for controlling the lifting of the cutting platform is connected to the cutting platform and controls the lifting of the cutting platform. The solenoid valve group for controlling the lifting of the cutting platform comprises a first electro-hydraulic proportional valve, a second electro-hydraulic proportional valve and a hydraulic relief valve. The lifting speed of the cutting platform is adjusted by controlling the electric proportional opening of the first electro-hydraulic proportional valve and the second electro-hydraulic proportional valve, and the relief pressure of the hydraulic relief valve is adjusted to adapt to various models of cutting platforms. The oil switching valve group is connected to the gearbox shift control valve group, and the gearbox shift control valve group is used to switch the gear position of the travel gearbox; The oil return ports of the cutting platform and shift oil circuit switching valve group, the cutting platform lifting cylinder control solenoid valve group, the oil switching valve group and the transmission shift control valve group are all connected to the hydraulic oil tank.

2. The header lifting and gearbox electronic shifting hydraulic control system according to claim 1 is characterized in that: It also includes a liquid-filled brake valve group; the oil switching valve group is also connected to the liquid-filled brake valve group; The liquid-filled brake valve group is communicated with the first accumulator, the parking brake and the foot brake system respectively.

3. The header lifting and gearbox electronic shifting hydraulic control system according to claim 2, characterized in that: It also includes a first pressure sensor, which can detect the internal pressure of the liquid-charging brake valve group; when the pressure value detected by the first pressure sensor is lower than a preset value, the solenoid valve in the liquid-charging brake valve group is controlled to open to charge the first accumulator.

4. The header lifting and gearbox electronic shifting hydraulic control system according to claim 1, characterized in that: The cutting platform lifting oil cylinder control solenoid valve group also includes a second accumulator for maintaining the pressure of the cutting platform and buffering the lifting of the cutting platform.

5. The header lifting and gearbox electronic shifting hydraulic control system according to claim 4, characterized in that: The header lifting oil cylinder control solenoid valve group further includes a second pressure sensor, which is used to detect the internal pressure of the header lifting oil cylinder control solenoid valve group.

6. An agricultural machine, characterized in that: It includes the hydraulic control system for header lifting and gearbox electronic shifting as claimed in claim 1, as well as a header, an engine, a transfer case and a travel gearbox; The transfer case is connected to the flywheel of the engine via a flexible connection plate, and the gear pump is connected to the drive port of the transfer case via a spline and is fixed to the transfer case; The cutting platform lifting cylinder control solenoid valve group is connected to the cutting platform and controls the lifting of the cutting platform; the transmission shift control valve group is used to switch the gear position of the travel transmission.

7. The agricultural machine according to claim 6, characterized in that: It also includes a liquid-filled brake valve group; the oil switching valve group is also connected to the liquid-filled brake valve group.

8. The agricultural machine according to claim 7, characterized in that: The hydraulic oil tank, the cutting platform and shift oil circuit switching valve group, the cutting platform lifting cylinder control solenoid valve group, the oil switching valve group and the liquid filling brake valve group are all fixed to the frame by bolts.

9. The agricultural machine according to claim 7, characterized in that: The gearbox shift control valve group is installed on the upper part of the travel gearbox box, and the travel gearbox is fixed to the front axle pipe beam of the frame by bolts.

10. The agricultural machine according to claim 7, characterized in that: It also includes a controller, an operating mechanism and a display screen arranged in the cab; The controller is electrically connected to the gear pump, the header and shift oil circuit switching valve group, the header lifting cylinder control solenoid valve group, the oil switching valve group, the liquid filling brake valve group, the transmission shift control valve group and the operating mechanism respectively; The display screen is used to display the status of the cutting platform and the travel gearbox.

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