CN117905738B - Sequential starting hydraulic system and harvester - Google Patents

Abstract

A hydraulic system and a harvester are started sequentially, which relate to the technical field of agricultural machinery. The sequential starting hydraulic system comprises a sequence valve, an execution element group, a control valve group and a sensor group; the actuator group comprises a first actuator, a second actuator and a third actuator; the first executive component and the second executive component are respectively connected with the sequence valve; the control valve group comprises a valve group inlet, a valve group return port, a first reversing valve part and a second reversing valve part; the valve group inlet and the valve group return are respectively connected with the third execution element through a second reversing valve part, and the second reversing valve part is configured to be capable of switching the working state of the third execution element; the sensor group includes a first sensor for monitoring actuation of the first actuator and a third sensor for monitoring actuation of the third actuator. The harvester includes a sequential actuation hydraulic system. The invention provides a sequential starting hydraulic system and a harvester, which are used for solving the technical problems of more connecting ports and connecting pipelines, complex structure and inconvenient installation and maintenance.

Description

Sequential starting hydraulic system and harvester

Technical Field

The invention relates to the technical field of agricultural machinery, in particular to a sequential starting hydraulic system and a harvester.

Background

At present, a part of agricultural machinery hydraulic systems require a plurality of executive components to realize linkage effect during working; in order to achieve the linkage effect, more connectors and connecting pipelines are needed, the structure is complex, and the installation and maintenance are inconvenient.

Disclosure of Invention

The invention aims to provide a sequential starting hydraulic system and a harvester, which are used for solving the technical problems of more connectors and connecting pipelines, complex structure and inconvenience in installation and maintenance in the prior art to a certain extent.

In order to achieve the above object, the present invention provides the following technical solutions:

a sequential starting hydraulic system comprises a sequence valve, an execution element group, a control valve group and a sensor group;

The sequence valve comprises a sequence valve first interface and a sequence valve second interface;

the execution element group comprises a first execution element, a second execution element and a third execution element; the first executing element and the second executing element are respectively connected with the sequence valve; the sequence valve is configured to drive the first executive element and the second executive element to be sequentially started when a first interface of the sequence valve inputs medium, and is further configured to drive the second executive element and the first executive element to be sequentially started when a second interface of the sequence valve inputs medium;

The control valve group comprises a valve group inlet, a valve group return port, a first reversing valve part and a second reversing valve part; the valve group inlet and the valve group return are respectively connected with the third execution element through the second reversing valve part, and the second reversing valve part is configured to be capable of switching the working state of the third execution element;

The sequence valve first interface and the sequence valve second interface are respectively connected with the first reversing valve part; the first reversing valve part is provided with a first working position and a second working position, when the first reversing valve part is in the first working position, the first interface of the sequence valve is communicated with the valve group inlet through the first reversing valve part, and the second interface of the sequence valve is communicated with the valve group return opening through the first reversing valve part; when the first reversing valve part is in a second working position, the first interface of the sequence valve is communicated with the valve group return port through the first reversing valve part, and the second interface of the sequence valve is communicated with the valve group inlet through the first reversing valve part;

The sensor group comprises a first sensor for monitoring the starting of the first executive component and a third sensor for monitoring the starting of the third executive component; the first reversing valve portion is configured to turn off a power supply when the third sensor detects that the third actuator is started; the second reversing valve portion is configured to disconnect power when the first sensor detects that the first actuator is activated.

In one possible embodiment, the sensor group includes an initial position sensor for monitoring that the preset object is in an initial preset position;

When the initial position sensor detects that a preset object is at an initial preset position, the power supplies of the first reversing valve part and the second reversing valve part are communicated;

When the initial position sensor detects that the preset object is not at the initial preset position, the power supply of the first reversing valve part is disconnected, and the power supply of the second reversing valve part is communicated.

In a possible embodiment, the sensor group further comprises a second sensor for monitoring the actuation of the second actuator; the actuator group further comprises a fourth actuator;

the fourth actuator is configured to be activated after the second sensor detects a preset time interval for activation of the second actuator;

Or the control valve group further comprises a third reversing valve part connected with the fourth execution element, and the third reversing valve part is configured to be capable of switching the working state of the fourth execution element; the third reversing valve portion is configured to communicate with a power supply after the second sensor monitors a preset time interval for starting the second actuating element, so that the valve group inlet and the valve group return are respectively communicated with the fourth actuating element.

In one possible implementation manner, the third reversing valve portion is a three-position four-way reversing valve structure;

The three-position four-way reversing valve structure comprises a reversing valve inlet, a reversing valve return port, a reversing work first interface and a reversing work second interface; the three-position four-way reversing valve structure is in a disconnection state when being positioned at a non-working position; when the three-position four-way reversing valve structure is positioned at a first working position, the inlet of the reversing valve is communicated with the first reversing working interface, and the return opening of the reversing valve is communicated with the second reversing working interface; when the three-position four-way reversing valve structure is positioned at a second working position, the inlet of the reversing valve is communicated with the reversing working second interface, and the return opening of the reversing valve is communicated with the reversing working first interface;

the reversing valve inlet is communicated with the valve bank inlet, and the reversing valve return port is communicated with the valve bank return port; the reversing work first interface and the reversing work second interface of the third reversing valve part are respectively communicated with the fourth executing element;

the fourth executing element is a swinging cylinder, a hydraulic motor or an electric element.

In one possible embodiment, the first reversing valve portion and/or the second reversing valve portion is a three-position four-way reversing valve structure;

The three-position four-way reversing valve structure comprises a reversing valve inlet, a reversing valve return port, a reversing work first interface and a reversing work second interface; the three-position four-way reversing valve structure is in a disconnection state when being positioned at a non-working position; when the three-position four-way reversing valve structure is positioned at a first working position, the inlet of the reversing valve is communicated with the first reversing working interface, and the return opening of the reversing valve is communicated with the second reversing working interface; when the three-position four-way reversing valve structure is positioned at a second working position, the inlet of the reversing valve is communicated with the reversing working second interface, and the return opening of the reversing valve is communicated with the reversing working first interface;

the reversing valve inlet is communicated with the valve bank inlet, and the reversing valve return port is communicated with the valve bank return port;

the reversing working first interface of the first reversing valve part is communicated with the first interface of the sequence valve, and the reversing working second interface of the first reversing valve part is communicated with the second interface of the sequence valve;

the reversing work first interface and the reversing work second interface of the second reversing valve part are respectively communicated with the third executing element.

In one possible embodiment, the control valve group further comprises a main control valve; the main control valve is used for controlling the medium to flow into the control valve group from the valve group inlet and controlling the medium to flow back into the valve group return port from the control valve group;

The control valve group comprises an overflow valve; the relief valve is configured to open when a pressure differential between the valve block inlet and the valve block return is greater than a preset pressure.

In one possible embodiment, the sequence valve comprises a first working interface, a second working interface, a third working interface, a fourth working interface, a first sequence reversing valve portion and a second sequence reversing valve portion; the first working interface and the second working interface are respectively connected with the first executing element, and the third working interface and the fourth working interface are respectively connected with the second executing element;

The first sequential reversing valve part comprises a first sequential reversing interface, a second sequential reversing interface and a third sequential reversing interface; the first sequential reversing valve portion is configured to reverse when the first sequential reversing interface reaches a first preset pressure, and is switched from the second sequential reversing interface to the third sequential reversing interface, so that the second sequential reversing interface is communicated with the first sequential reversing interface;

the second sequential reversing valve part comprises a fourth sequential reversing interface, a fifth sequential reversing interface and a sixth sequential reversing interface; the second sequential reversing valve portion is configured to reverse when the fourth sequential reversing interface reaches a second preset pressure, and is switched from the fifth sequential reversing interface to the sixth sequential reversing interface, so that the fifth sequential reversing interface is communicated with the fourth sequential reversing interface;

The first interface of the sequence valve is respectively communicated with the first working interface and the fourth sequential interface, and the second interface of the sequence valve is respectively communicated with the fourth working interface and the first sequential interface; the second working interface is communicated with the second conversion interface; the third working interface is communicated with the fifth sequential interface;

The second working interface is communicated with the sequence valve second interface through a first one-way valve, and the first one-way valve is configured to conduct the sequence valve second interface unidirectionally from the second working interface; the third working interface is communicated with the first interface of the sequence valve through a second one-way valve, and the second one-way valve is configured to conduct the first interface of the sequence valve unidirectionally from the third working interface;

optionally, the sequence valve further comprises a first pressure regulating device configured to regulate the first preset pressure, or the sequence valve further comprises a second pressure regulating device configured to regulate the second preset pressure;

optionally, the first sequential reversing valve portion and the second sequential reversing valve portion are both two-position three-way reversing valve structures.

In one possible embodiment, the sensor group includes one or more of a pressure sensor, an angle sensor, a gravity sensor, a distance sensor, and a speed sensor;

the first executing element, the second executing element and the third executing element are respectively a swinging cylinder or a hydraulic motor;

the sequence valve comprises a sequence valve body; the sequence valve first interface and the sequence valve second interface are both arranged on the sequence valve body;

The control valve group comprises a control valve body; the valve group inlet and the valve group return opening are both arranged on the control valve body, and the first reversing valve part and the second reversing valve part are both arranged in the control valve body.

A harvester includes a sequential start hydraulic system.

In one possible embodiment, the harvester further comprises a body, a side lift and a grain tank; the side lifting device and the grain tank are respectively hinged with the machine body; the first executing element and the third executing element are respectively connected with the machine body;

The first executing element is in driving connection with the side lifting device so that the side lifting device can rotate and lift relative to the machine body;

the second executing element is connected with the side lifting device; the second actuating element drives a folding arm connected with the side lifting device so that the folding arm can be unfolded relative to the machine body;

the third executive component is in driving connection with the grain tank so that the grain tank can turn over relative to the machine body;

The sensor group comprises an initial position sensor for monitoring that the grain tank is at an initial preset position; when the initial position sensor detects that the grain tank is not at an initial preset position, the power supply of the first reversing valve part is disconnected, and the power supply of the second reversing valve part is communicated;

the initial position sensor is an in-place sensor or a distance sensor.

The beneficial effects of the invention are mainly as follows:

According to the sequential starting hydraulic system and the harvester, linkage of all execution elements of the execution element group is realized through cooperation of the sequence valve, the control valve group and the sensor group; the structure is relatively simple, the number of connecting ports and connecting pipelines is reduced to a certain extent, and the installation and maintenance are convenient. Specifically, the first executive component and the second executive component can realize the sequential starting of the first executive component and the second executive component through the sequence valve, and the sequential starting of the first executive component and the second executive component can be realized; the third sensor can cut off the power supply of the first reversing valve part when the third executing element is started, so that the first executing element and the second executing element connected with the sequence valve are controlled to be incapable of being started; the first sensor can cut off the power supply of the second reversing valve part when the first executing element is started, so that the third executing element can not be started.

In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a hydraulic schematic diagram of a sequential start hydraulic system provided by an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of the sequential start hydraulic system shown in FIG. 1;

FIG. 3 is a hydraulic schematic diagram of a control valve set according to an embodiment of the present invention;

fig. 4 is a hydraulic schematic diagram of a sequence valve according to an embodiment of the present invention.

Icon: 100-sequence valve; 110-a first sequential reversing valve portion; 120-a second sequential reversing valve portion; 130-sequential valve body; 131-a first working interface; 132-a second work interface; 133-a third work interface; 134-fourth working interface; 135-sequence valve first port; 136-sequence valve second port; 140-a first one-way valve; 150-a second one-way valve; 200-an actuator group; 210-a first actuator; 220-a second actuator; 230-a third actuator; 240-fourth actuator; 300-controlling a valve group; 310-valve block inlet; 320-valve group return port; 330-a first reversing valve portion; 340-a second reversing valve portion; 350-a third reversing valve portion; 360-main control valve; 370-overflow valve; 380-controlling the valve body; 400-sensor group; 410-a first sensor; 420-a second sensor; 430-a third sensor; 440-initial bit sensor.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Some embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.

Examples

The embodiment provides a hydraulic system and a harvester which are started sequentially; referring to fig. 1 to 4, fig. 1 is a hydraulic schematic diagram of a sequential start hydraulic system according to the present embodiment; FIG. 2 is an enlarged view of a portion of the sequential start hydraulic system of FIG. 1 showing a schematic representation of the configuration of the control valve block; in order to more clearly show the hydraulic principle, fig. 3 is a hydraulic principle diagram of the control valve set provided in the present embodiment, and fig. 4 is a hydraulic principle diagram of the sequence valve provided in the present embodiment.

The sequential starting hydraulic system provided by the embodiment can be used for agricultural mechanical hydraulic systems or mechanical hydraulic systems in other industries. Referring to fig. 1-4, the sequential actuation hydraulic system includes a sequence valve 100, an actuator group 200, a control valve group 300, and a sensor group 400.

Sequence valve 100 includes a sequence valve first port 135 and a sequence valve second port 136; in fig. 1 and 4, the sequence valve first port 135 is indicated at C and the sequence valve second port 136 is indicated at d.

The actuator group 200 includes a first actuator 210, a second actuator 220, and a third actuator 230; the first actuator 210 and the second actuator 220 are respectively connected with the sequence valve 100; the sequence valve 100 is configured to actuate the first actuator 210 and the second actuator 220 when the first interface 135 of the sequence valve inputs media, and the sequence valve 100 is further configured to actuate the second actuator 220 and the first actuator 210 when the second interface 136 of the sequence valve inputs media; that is, the first port 135 and the second port 136 can be regarded as medium inlet and return ports of the sequence valve 100, and the sequence of starting the first actuator 210 and the second actuator 220 sequentially is controlled by adjusting the medium inlet and return sequences of the first port 135 and the second port 136, so that the number of connecting ports and connecting pipelines can be reduced, and the cost is reduced to a certain extent.

The control valve block 300 includes a valve block inlet 310, a valve block return 320, a first reversing valve portion 330, and a second reversing valve portion 340; as in fig. 1-3, valve block inlet 310 is indicated at P and valve block return 320 is indicated at t. The valve group inlet 310 and the valve group return 320 are respectively connected with the third execution element 230 through a second reversing valve portion 340, and the second reversing valve portion 340 is configured to be capable of switching the working state of the third execution element 230; for example, the valve block inlet 310 and the valve block return 320 control the order of the third actuator 230 feeding and returning the medium through the second reversing valve portion 340 to change the operating state of the third actuator 230, such as switching the third actuator 230 from the extended state to the retracted state or from the retracted state to the extended state.

The sequence valve first port 135 and the sequence valve second port 136 are connected to the first reversing valve portion 330, respectively; the first reversing valve portion 330 has a first working position and a second working position, when the first reversing valve portion 330 is in the first working position, the sequence valve first interface 135 is communicated with the valve set inlet 310 through the first reversing valve portion 330, and the sequence valve second interface 136 is communicated with the valve set return 320 through the first reversing valve portion 330; when the first reversing valve portion 330 is in the second working position, the sequence valve first interface 135 is communicated with the valve set return port 320 through the first reversing valve portion 330, and the sequence valve second interface 136 is communicated with the valve set inlet 310 through the first reversing valve portion 330; that is, the first reversing valve 330 may be switched from the first working position to the second working position, or from the second working position to the first working position, so as to change the order in which the first port 135 of the sequence valve and the second port 136 of the sequence valve are connected to the medium and the medium, thereby controlling the order in which the first actuator 210 and the second actuator 220 are started sequentially.

The sensor set 400 includes a first sensor 410 for monitoring actuation of the first actuator 210 and a third sensor 430 for monitoring actuation of the third actuator 230.

The first reversing valve portion 330 is configured to turn off the power supply when the third sensor 430 detects that the third actuator 230 is activated; that is, when the third actuator 230 is activated, the power supply of the second reversing valve portion 340 is in the connected state, and the first reversing valve portion 330 is disconnected, so that the sequence valve 100 cannot be activated, and the first actuator 210 and the second actuator 220 cannot be activated.

The second reversing valve portion 340 is configured to disconnect power when the first sensor 410 detects actuation of the first actuator 210. That is, when the first actuator 210 is started, the power supply of the first reversing valve 330 is in a connected state, and the second reversing valve 340 is disconnected, so that the third actuator 230 cannot be started.

The sequential starting hydraulic system in the embodiment realizes the linkage of all the execution elements of the execution element group 200 through the cooperation of the sequence valve 100, the control valve group 300 and the sensor group 400; the structure is relatively simple, the number of connecting ports and connecting pipelines is reduced to a certain extent, and the installation and maintenance are convenient. Specifically, the sequential actuation of the first actuator 210 and the second actuator 220, and the sequential actuation of the first actuator 210 and the second actuator 220 may be achieved by the sequence valve 100; by the third sensor 430, the power of the first reversing valve 330 can be disconnected when the third actuator 230 is started, so as to control the first actuator 210 and the second actuator 220 connected with the sequence valve 100 to be unable to be started; by the first sensor 410, the power of the second reversing valve portion 340 can be disconnected when the first actuator 210 is started, so that the third actuator 230 can not be started.

Referring to fig. 1 and 2, in an alternative to the present embodiment, the sensor group 400 includes an initial position sensor 440 for monitoring that a preset object is in an initial preset position.

When the initial position sensor 440 detects that the preset object is at the initial preset position, the power supplies of the first reversing valve 330 and the second reversing valve 340 are all communicated; that is, when the preset object is at the initial preset position, the power supplies of the first reversing valve portion 330 and the second reversing valve portion 340 are all communicated, and the first reversing valve portion 330 and the second reversing valve portion 340 are both in a to-be-operated state; when the first reversing valve portion 330 is controlled to work, the medium drives the first actuator 210 to start, and the first sensor 410 monitors that the first actuator 210 is started, and cuts off the power supply of the second reversing valve portion 340, so that the third actuator 230 cannot be started; when the second reversing valve portion 340 is controlled to operate, the medium drives the third actuator 230 to start, and the third sensor 430 monitors that the third actuator 230 is started, and cuts off the power supply to the first reversing valve portion 330, so that the sequence valve 100 cannot be started, and the first actuator 210 and the second actuator 220 cannot be started.

When the initial position sensor 440 detects that the preset object is not at the initial preset position, the power of the first reversing valve 330 is turned off, and the power of the second reversing valve 340 is turned on. That is, when the preset object is not at the initial preset position, the power of the first reversing valve portion 330 is turned off, so that the sequence valve 100 cannot be started, and thus the first actuator 210 and the second actuator 220 cannot be started, the power of the second reversing valve portion 340 is communicated, and the operation state of the third actuator 230 can be switched through the second reversing valve portion 340.

Referring to fig. 1 and 2, in an alternative to the present embodiment, the sensor set 400 further includes a second sensor 420 for monitoring actuation of the second actuator 220; the actuator group 200 also includes a fourth actuator 240.

After the second sensor 420 detects that the second actuator 220 is activated, the fourth actuator 240 may be activated automatically or manually by a button, a key, or the like.

Specifically, optionally, automatic start up: the fourth actuator 240 is configured to actuate after the second sensor 420 detects a preset time interval for actuation of the second actuator 220; after a preset time interval following actuation of the second actuator 220, the fourth actuator 240 is automatically actuated.

Optionally, manually starting: the control valve group 300 further includes a third reversing valve portion 350 connected to the fourth actuator 240, the third reversing valve portion 350 being configured to be capable of switching the working state of the fourth actuator 240; the third reversing valve portion 350 is configured to communicate with the power source after the second sensor 420 detects a preset time interval for actuation of the second actuator 220 such that the valve block inlet 310 and the valve block return 320 are in communication with the fourth actuator 240, respectively. In this embodiment, the valve set inlet 310 and the valve set return 320 control the order of medium feeding and medium returning of the fourth actuator 240 through the third reversing valve portion 350, so as to change the working state of the fourth actuator 240, such as switching the fourth actuator 240 from the extended state to the retracted state, or from the retracted state to the extended state. When the fourth actuator 240 is started, the power supply of the third reversing valve 350 is in a connected state.

Referring to fig. 3, in an alternative of this embodiment, the third reversing valve portion 350 is a three-position four-way reversing valve structure.

The three-position four-way reversing valve structure comprises a reversing valve inlet, a reversing valve return port, a reversing work first interface and a reversing work second interface; the three-position four-way reversing valve structure further comprises a non-working position, a first working position and a second working position.

The three-position four-way reversing valve structure is in a disconnection state when being positioned at a non-working position; that is, the third switching valve section 350 is in the off state in the non-operating position, and the fourth actuator 240 cannot be activated.

When the three-position four-way reversing valve structure is positioned at a first working position, an inlet of the reversing valve is communicated with a first reversing working interface, and a return opening of the reversing valve is communicated with a second reversing working interface; when the three-position four-way reversing valve structure is positioned at the second working position, the inlet of the reversing valve is communicated with a reversing working second interface, and the return opening of the reversing valve is communicated with a reversing working first interface; the reversing valve inlet is communicated with the valve bank inlet 310, and the reversing valve return port is communicated with the valve bank return port 320; the reversing first interface and the reversing second interface of the third reversing valve portion 350 are respectively communicated with the fourth actuator 240; in fig. 1 to 3, A3 represents a first port for reversing operation of the third reversing valve portion 350, and B3 represents a second port for reversing operation of the third reversing valve portion 350. In the third reversing valve 350 of this embodiment, the switching between the first working position and the second working position changes the order of medium feeding and medium returning of the fourth actuator 240, so as to change the working state of the fourth actuator 240.

Optionally, the fourth actuator 240 is a swing cylinder, a hydraulic motor or an electrical component, or other component.

Referring to fig. 3, in an alternative of the present embodiment, the first reversing valve portion 330 and/or the second reversing valve portion 340 is a three-position four-way reversing valve structure; that is, the first reversing valve portion 330 is a three-position four-way reversing valve structure, or the second reversing valve portion 340 is a three-position four-way reversing valve structure, or both the first reversing valve portion 330 and the second reversing valve portion 340 are three-position four-way reversing valve structures.

The three-position four-way reversing valve structure comprises a reversing valve inlet, a reversing valve return port, a reversing work first interface and a reversing work second interface; the three-position four-way reversing valve structure is in a disconnection state when being positioned at a non-working position; when the three-position four-way reversing valve structure is positioned at a first working position, an inlet of the reversing valve is communicated with a first reversing working interface, and a return opening of the reversing valve is communicated with a second reversing working interface; when the three-position four-way reversing valve structure is positioned at the second working position, the inlet of the reversing valve is communicated with the reversing working second interface, and the return opening of the reversing valve is communicated with the reversing working first interface.

The reversing valve inlet communicates with the valve block inlet 310 and the reversing valve return port communicates with the valve block return port 320.

The reversing first port of the first reversing valve portion 330 is communicated with the sequence valve first port 135, and the reversing second port of the first reversing valve portion 330 is communicated with the sequence valve second port 136; in fig. 1 to 3, A1 represents a first port for reversing operation of the first reversing valve portion 330, and B1 represents a second port for reversing operation of the first reversing valve portion 330. In the first reversing valve 330 of this embodiment, the sequence of connecting the first interface 135 of the sequence valve and the second interface 136 of the sequence valve to the medium and the medium is changed by switching between the first working position and the second working position, so as to control the sequence of starting the first actuator 210 and the second actuator 220 sequentially.

The reversing-operation first port and the reversing-operation second port of the second reversing valve portion 340 are respectively communicated with the third actuator 230. In fig. 1 to 3, a first port for reversing operation of the second reversing valve portion 340 is indicated at A2, and a second port for reversing operation of the second reversing valve portion 340 is indicated at B2. In the second reversing valve 340 of this embodiment, the switching between the first working position and the second working position changes the order of the third actuator 230 for feeding and returning the medium, so as to change the working state of the third actuator 230.

Referring to fig. 1-3, in an alternative to this embodiment, the control valve block 300 further includes a main control valve 360; the main control valve 360 is used for controlling the on-off of medium flowing into the control valve block 300 from the valve block inlet 310 and controlling the on-off of medium flowing back into the valve block return port 320 from the control valve block 300; the main control valve 360 is used for controlling the on-off of the medium inflow and outflow control valve group 300, so as to control the on-off of the medium inflow and outflow sequence starting hydraulic system.

Referring to fig. 3, in an alternative to the present embodiment, the control valve block 300 includes a relief valve 370; relief valve 370 is configured to open when the pressure differential between valve block inlet 310 and valve block return 320 is greater than a preset pressure. The operating pressure of the control valve block 300 is regulated by the relief valve 370 to protect the control valve block 300 and thus the sequential start-up hydraulic system.

Referring to fig. 1 and 4, in an alternative of the present embodiment, the sequence valve 100 includes a first working port 131, a second working port 132, a third working port 133, a fourth working port 134, a first sequence reversing valve portion 110, and a second sequence reversing valve portion 120; the first working interface 131 and the second working interface 132 are respectively connected with the first executing element 210, and the third working interface 133 and the fourth working interface 134 are respectively connected with the second executing element 220; in fig. 1 and 4, a first work interface 131 is indicated at C1, a second work interface 132 is indicated at D1, a third work interface 133 is indicated at C2, and a fourth work interface 134 is indicated at D2.

The first sequential switching valve portion 110 includes a first sequential switching interface, a second sequential switching interface, and a third sequential switching interface; the first sequential reversing valve portion 110 is configured to reverse when the first sequential switching port reaches a first preset pressure, and is switched from communicating the second sequential switching port with the third sequential switching port to communicating the second sequential switching port with the first sequential switching port; that is, in the initial state, the second sequential switching port of the first sequential switching valve portion 110 is communicated with the third sequential switching port, and the second sequential switching port is not communicated with the first sequential switching port; when the first sequential exchange port reaches or exceeds the first preset pressure, the oil pressure at the first sequential exchange port drives the first sequential exchange valve portion 110 to exchange direction, and after the direction exchange, the second sequential exchange port is communicated with the first sequential exchange port, and the second sequential exchange port is not communicated with the third sequential exchange port. As shown in fig. 4, ① denotes a first swap interface, ② denotes a second swap interface, and ③ denotes a third swap interface.

The second sequential switching valve portion 120 includes a fourth sequential switching interface, a fifth sequential switching interface, and a sixth sequential switching interface; the second sequential reversing valve portion 120 is configured to reverse when the fourth sequential exchange port reaches a second preset pressure, and switch from communicating the fifth sequential exchange port with the sixth sequential exchange port to communicating the fifth sequential exchange port with the fourth sequential exchange port; that is, in the initial state, the fifth sequential switching port of the second sequential switching valve portion 120 communicates with the sixth sequential switching port, and the fifth sequential switching port does not communicate with the fourth sequential switching port; when the fourth sequential exchange port reaches or exceeds the second preset pressure, the oil pressure at the fourth sequential exchange port drives the second sequential exchange valve portion 120 to exchange direction, and after the direction exchange, the fifth sequential exchange port is communicated with the fourth sequential exchange port, and the fifth sequential exchange port is not communicated with the sixth sequential exchange port. As shown in fig. 4, ④ denotes a fourth swap interface, ⑤ denotes a fifth swap interface, and ⑥ denotes a sixth swap interface.

The sequence valve first interface 135 is respectively communicated with the first working interface 131 and the fourth sequence interface, and the sequence valve second interface 136 is respectively communicated with the fourth working interface 134 and the first sequence interface; the second work interface 132 communicates with the second crossover interface; the third working interface 133 communicates with the fifth crossover interface.

The second working port 132 communicates with the sequence valve second port 136 through a first check valve 140, and the first check valve 140 is configured to unidirectional conduct the sequence valve second port 136 from the second working port 132; the third working port 133 communicates with the sequence valve first port 135 through the second check valve 150, and the second check valve 150 is configured to unidirectional conduct the sequence valve first port 135 from the third working port 133; the sequence valve 100 in the present embodiment is formed as a single body by integrating the first sequence valve portion 110, the second sequence valve portion 120, the first check valve 140, and the second check valve 150; the first interface 135 and the second interface 136 of the sequence valve are the oil inlet and the oil outlet of the hydraulic pipeline connected by the sequence valve, the first working interface 131 and the second working interface 132 are the oil inlet and the oil outlet of the first execution element 210 connected by the sequence valve, the third working interface 133 and the fourth working interface 134 are the oil inlet and the oil outlet of the second execution element 220 connected by the sequence valve, and sequential starting of the first execution element 210 and the second execution element 220 is controlled by adjusting the sequence of the oil inlet and the oil outlet of the sequence valve by the first interface 135 and the second interface 136 of the sequence valve; the sequence valve has compact structure, does not need to add other elements and pipelines, greatly simplifies the structure of a hydraulic system, is convenient to maintain, and reduces the failure rate caused by more pipelines to a certain extent.

Optionally, the sequence valve 100 further comprises a first pressure regulating device configured to regulate a first preset pressure; the first pressure adjusting device can adjust the first preset pressure of the first sequential reversing valve portion 110, so as to adjust the time interval for restarting the first actuator 210 when the action of the second actuator 220 is completed.

Optionally, the sequence valve 100 further comprises a second pressure regulating device configured to regulate a second preset pressure; the second pressure adjusting device can adjust the second preset pressure of the second sequential reversing valve portion 120, so as to adjust the time interval for restarting the second actuator 220 when the action of the first actuator 210 is completed.

Alternatively, the first sequential reversing valve portion 110 and the second sequential reversing valve portion 120 are each a two-position three-way reversing valve structure, or other similar structure.

In an alternative to this embodiment, sequence valve 100 includes sequence valve body 130; the sequence valve first port 135 and the sequence valve second port 136 are both provided on the sequence valve body 130; the sequence valve 100 is integrated by the sequence valve body 130, so that the sequence valve 100 is convenient to connect.

In an alternative to this embodiment, sensor group 400 includes one or more of a pressure sensor, an angle sensor, a gravity sensor, a distance sensor, and a speed sensor, or other sensors.

In an alternative to this embodiment, the actuator group 200 includes one or more of a swing cylinder, a hydraulic motor, and an electrical component, or other components. Optionally, the first actuator 210, the second actuator 220 and the third actuator 230 are swing cylinders or hydraulic motors, respectively.

In an alternative to this embodiment, control valve block 300 includes a control valve body 380; the valve block inlet 310 and the valve block return 320 are both disposed on the control valve body 380, and the first reversing valve portion 330 and the second reversing valve portion 340 are both disposed within the control valve body 380. The valve block 300 is integrated by the control valve body 380, so that the connection of the valve block 300 is facilitated.

For a clearer understanding of this embodiment, several operating states of the sequential start-up hydraulic system are briefly described as follows:

(1) When the primary control valve 360 is energized and the primary position sensor 440 has a signal, the power supplies of the first and second reversing valve portions 330 and 340 are all connected, but the first and second reversing valve portions 330 and 340 can only be started up, and cannot be started up at the same time. At this time, two cases are further divided, specifically as follows:

In the first case, the first reversing valve portion 330 is first electrified, the medium enters the control valve 300 from the valve set inlet 310 (P port), enters the sequence valve first interface 135 (C port) of the sequence valve 100 through the reversing operation first interface (A1 port) of the first reversing valve portion 330, drives the first actuator 210 to start, the first actuator 210 will give a signal to the first sensor 410 after starting, the signal of the first sensor 410 will immediately make the second reversing valve portion 340 not electrified, the second actuator 220 will immediately start after the first actuator 210 is started, the medium enters the reversing operation second interface (B1 port) of the first reversing valve portion 330 through the sequence valve second interface 136 (D port) and then flows back to the liquid tank from the valve set return port 320 (T port), and after the second actuator 220 is started to a certain program, the second sensor 420 will obtain a signal, and feed the signal back to the third reversing valve portion 350, so that the third actuator 350 is electrified, and the fourth actuator 240 moves. In this process, the third actuator 230 cannot be activated because the second reversing valve portion 340 is not energized.

In the second case, the second reversing valve portion 340 is electrified, at this time, a medium enters the control valve 300 from the valve set inlet 310 (P port), enters the third actuator 230 through the reversing operation first interface (A2 port) of the second reversing valve portion 340, is monitored by the third sensor 430 after the third actuator 230 is started and immediately gives a signal to the first reversing valve portion 330, so that the first reversing valve portion 330 cannot be electrified, and the medium flows back to the reversing operation second interface (B2 port) of the second reversing valve portion 340 and then flows back to the liquid tank through the valve set return port 320 (T port); this process does not allow the first actuator 210 and the second actuator 220 to be activated because the first reversing valve portion 330 is not energized.

(2) When the main control valve 360 is energized and the initial position sensor 440 is not energized, only the second reversing valve portion 340 is energized, the third actuator 230 can be activated, and the first actuator 210, the second actuator 220, and the fourth actuator 240 cannot be activated.

The above two working states are controlled by the control valve group 300 and the sensor group 400, so that the third executive element 230, the first executive element 210 and the second executive element 220 are independently started, the first executive element 210 and the second executive element 220 can be sequentially started, the second sensor 420 on the second executive element 220 can control the starting of the fourth executive element 240, the linkage of each executive element is realized only by the simple hydraulic system, and repeated experiments and practical application prove that the hydraulic system has the advantages of simple structure, convenient operation, high working response speed, high sensitivity, convenient maintenance, wide application range, stable operation and wide application range, can reduce the cost of the whole hydraulic system, and has good practicability and popularization prospect.

The embodiment also provides a harvester, which comprises the sequential starting hydraulic system of any of the embodiments. The harvester realizes the linkage of all the execution elements of the execution element group 200 by sequentially starting the sequence valve 100, the control valve group 300 and the sensor group 400 of the hydraulic system; the structure is relatively simple, the number of connecting ports and connecting pipelines is reduced to a certain extent, and the installation and maintenance are convenient. Specifically, the sequential actuation of the first actuator 210 and the second actuator 220, and the sequential actuation of the first actuator 210 and the second actuator 220 may be achieved by the sequence valve 100; by the third sensor 430, the power of the first reversing valve 330 can be disconnected when the third actuator 230 is started, so as to control the first actuator 210 and the second actuator 220 connected with the sequence valve 100 to be unable to be started; by the first sensor 410, the power of the second reversing valve portion 340 can be disconnected when the first actuator 210 is started, so that the third actuator 230 can not be started.

In an alternative of this embodiment, the harvester further comprises a body, a side lift device and a grain tank; the side lifting device and the grain tank are respectively hinged with the machine body; the first actuator 210 and the third actuator 230 are respectively connected with the machine body;

The first actuator 210 is connected with the side lifting device in a driving way so that the side lifting device can rotate and lift relative to the machine body;

The second actuator 220 is connected to the side lift; the second actuator 220 drives the folding arm connected to the side lift device so that the folding arm can be unfolded relative to the machine body;

The third actuating element 230 is in driving connection with the grain tank so that the grain tank can be turned relative to the machine body;

The sensor group 400 includes an initial position sensor 440 for monitoring that the grain bin is in an initial preset position; when the initial position sensor 440 detects that the grain tank is not at the initial preset position, the power supply of the first reversing valve portion 330 is disconnected, and the power supply of the second reversing valve portion 340 is communicated;

The initial position sensor 440 is a position sensor or a distance sensor.

For a clearer understanding of this embodiment, several operating conditions of the harvester are briefly described below:

(1) The main control valve 360 is energized, and when the grain tank is in the initial preset position, the initial position sensor 440 sends a signal, and the power supplies of the first reversing valve portion 330 and the second reversing valve portion 340 are all communicated, but the first reversing valve portion 330 and the second reversing valve portion 340 can only be started, and cannot be started simultaneously. At this time, two cases are further divided, specifically as follows:

In the first case, the first reversing valve portion 330 is first electrified, the medium enters the interior of the control valve 300 from the valve set inlet 310 (port P), enters the first port 135 (port C) of the sequence valve 100 through the reversing operation first port (port A1) of the first reversing valve portion 330, drives the first actuator 210 to drive the side lifting device so as to enable the side lifting device to rotationally lift relative to the machine body, the first actuator 210 starts and then gives a signal to the first sensor 410, the signal of the first sensor 410 immediately enables the second reversing valve portion 340 to be electrified, the first actuator 210 starts and completes, namely, the second actuator 220 starts and drives the folding arm of the side lifting device immediately after the lifting of the side lifting device is completed, so that the folding arm can be unfolded relative to the machine body, the medium enters the reversing operation second port (port B1) of the first reversing valve portion 330 through the second port 136 (port D) of the sequence valve, then flows back to the liquid tank from the valve set return port 320 (port T), and after the second actuator 220 starts to a certain arm, namely, the second actuator 220 starts and then gives a signal to the third reversing valve portion 350 after the first actuator 210 starts and completes the lifting of the reversing valve portion 350, so that the third reversing valve portion 350 is enabled to move. In this process, the third actuator 230 cannot be activated because the second reversing valve portion 340 is not energized. The fourth actuator 240 is, for example, a camera or a food baffle.

In the second case, the second reversing valve portion 340 is powered on, at this time, a medium enters the control valve 300 from the valve set inlet 310 (P port), enters the third executing element 230 through the reversing working first interface (A2 port) of the second reversing valve portion 340, the third executing element 230 is started and drives the grain tank to turn over relative to the machine body, the third executing element 230 is monitored by the third sensor 430 to be started, that is, the grain tank is monitored by the third sensor 430 to turn over and immediately give a signal to the first reversing valve portion 330, so that the first reversing valve portion 330 is not powered on, and the medium flows back to the liquid tank through the valve set return port 320 (T port) after flowing back to the reversing working second interface (B2 port) of the second reversing valve portion 340; in this process, the first actuator 210 and the second actuator 220 cannot be started, i.e., the side lift device cannot be lifted and the folding arm cannot be started, because the first reversing valve portion 330 is not energized.

(2) When the primary control valve 360 is energized and the primary position sensor 440 has no signal, only the second reversing valve 340 is energized, the third actuator 230 can be started, and the first actuator 210, the second actuator 220, and the fourth actuator 240 cannot be started; that is, in this working state, the third actuator 230 can drive the grain tank to turn over relative to the machine body, and neither the side lifting device nor the folding arm can be started.

The harvester provided in this embodiment includes the above-mentioned sequential start hydraulic system, and the technical features of the above-mentioned disclosed sequential start hydraulic system are also applicable to the harvester, and the technical features of the above-mentioned disclosed sequential start hydraulic system are not repeated. The harvester in this embodiment has the advantages of the above-described sequential start hydraulic system, and the advantages of the above-disclosed sequential start hydraulic system are not repeated here.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The sequential starting hydraulic system is characterized by comprising a sequence valve, an execution element group, a control valve group and a sensor group;

The sequence valve comprises a sequence valve first interface and a sequence valve second interface;

the execution element group comprises a first execution element, a second execution element and a third execution element; the first executing element and the second executing element are respectively connected with the sequence valve; the sequence valve is configured to drive the first executive element and the second executive element to be sequentially started when a first interface of the sequence valve inputs medium, and is further configured to drive the second executive element and the first executive element to be sequentially started when a second interface of the sequence valve inputs medium;

The control valve group comprises a valve group inlet, a valve group return port, a first reversing valve part and a second reversing valve part; the valve group inlet and the valve group return are respectively connected with the third execution element through the second reversing valve part, and the second reversing valve part is configured to be capable of switching the working state of the third execution element;

The sequence valve first interface and the sequence valve second interface are respectively connected with the first reversing valve part; the first reversing valve part is provided with a first working position and a second working position, when the first reversing valve part is in the first working position, the first interface of the sequence valve is communicated with the valve group inlet through the first reversing valve part, and the second interface of the sequence valve is communicated with the valve group return opening through the first reversing valve part; when the first reversing valve part is in a second working position, the first interface of the sequence valve is communicated with the valve group return port through the first reversing valve part, and the second interface of the sequence valve is communicated with the valve group inlet through the first reversing valve part;

The sensor group comprises a first sensor for monitoring the starting of the first executive component and a third sensor for monitoring the starting of the third executive component; the first reversing valve portion is configured to turn off a power supply when the third sensor detects that the third actuator is started; the second reversing valve portion is configured to disconnect power when the first sensor detects that the first actuator is activated.

2. The sequential start-up hydraulic system of claim 1, wherein the sensor set includes an initial position sensor for monitoring that a preset object is in an initial preset position;

When the initial position sensor detects that a preset object is at an initial preset position, the power supplies of the first reversing valve part and the second reversing valve part are communicated;

When the initial position sensor detects that the preset object is not at the initial preset position, the power supply of the first reversing valve part is disconnected, and the power supply of the second reversing valve part is communicated.

3. The sequential actuation hydraulic system of claim 1, wherein the sensor set further includes a second sensor for monitoring actuation of the second actuator; the actuator group further comprises a fourth actuator;

the fourth actuator is configured to be activated after the second sensor detects a preset time interval for activation of the second actuator;

Or the control valve group further comprises a third reversing valve part connected with the fourth execution element, and the third reversing valve part is configured to be capable of switching the working state of the fourth execution element; the third reversing valve portion is configured to communicate with a power supply after the second sensor monitors a preset time interval for starting the second actuating element, so that the valve group inlet and the valve group return are respectively communicated with the fourth actuating element.

4. The sequential start hydraulic system of claim 3, wherein the third reversing valve portion is a three-position four-way reversing valve structure;

The three-position four-way reversing valve structure comprises a reversing valve inlet, a reversing valve return port, a reversing work first interface and a reversing work second interface; the three-position four-way reversing valve structure is in a disconnection state when being positioned at a non-working position; when the three-position four-way reversing valve structure is positioned at a first working position, the inlet of the reversing valve is communicated with the first reversing working interface, and the return opening of the reversing valve is communicated with the second reversing working interface; when the three-position four-way reversing valve structure is positioned at a second working position, the inlet of the reversing valve is communicated with the reversing working second interface, and the return opening of the reversing valve is communicated with the reversing working first interface;

the reversing valve inlet is communicated with the valve bank inlet, and the reversing valve return port is communicated with the valve bank return port; the reversing work first interface and the reversing work second interface of the third reversing valve part are respectively communicated with the fourth executing element;

the fourth executing element is a swinging cylinder, a hydraulic motor or an electric element.

5. The sequential start hydraulic system of claim 1, wherein the first reversing valve portion and/or the second reversing valve portion is a three-position four-way reversing valve structure;

The three-position four-way reversing valve structure comprises a reversing valve inlet, a reversing valve return port, a reversing work first interface and a reversing work second interface; the three-position four-way reversing valve structure is in a disconnection state when being positioned at a non-working position; when the three-position four-way reversing valve structure is positioned at a first working position, the inlet of the reversing valve is communicated with the first reversing working interface, and the return opening of the reversing valve is communicated with the second reversing working interface; when the three-position four-way reversing valve structure is positioned at a second working position, the inlet of the reversing valve is communicated with the reversing working second interface, and the return opening of the reversing valve is communicated with the reversing working first interface;

the reversing valve inlet is communicated with the valve bank inlet, and the reversing valve return port is communicated with the valve bank return port;

the reversing working first interface of the first reversing valve part is communicated with the first interface of the sequence valve, and the reversing working second interface of the first reversing valve part is communicated with the second interface of the sequence valve;

the reversing work first interface and the reversing work second interface of the second reversing valve part are respectively communicated with the third executing element.

6. The sequential start-up hydraulic system of claim 1, wherein the control valve block further comprises a main control valve; the main control valve is used for controlling the medium to flow into the control valve group from the valve group inlet and controlling the medium to flow back into the valve group return port from the control valve group;

The control valve group comprises an overflow valve; the relief valve is configured to open when a pressure differential between the valve block inlet and the valve block return is greater than a preset pressure.

7. The sequential start-up hydraulic system of claim 1, wherein the sequence valve comprises a first work port, a second work port, a third work port, a fourth work port, a first sequential reversing valve portion, and a second sequential reversing valve portion; the first working interface and the second working interface are respectively connected with the first executing element, and the third working interface and the fourth working interface are respectively connected with the second executing element;

The first sequential reversing valve part comprises a first sequential reversing interface, a second sequential reversing interface and a third sequential reversing interface; the first sequential reversing valve portion is configured to reverse when the first sequential reversing interface reaches a first preset pressure, and is switched from the second sequential reversing interface to the third sequential reversing interface, so that the second sequential reversing interface is communicated with the first sequential reversing interface;

the second sequential reversing valve part comprises a fourth sequential reversing interface, a fifth sequential reversing interface and a sixth sequential reversing interface; the second sequential reversing valve portion is configured to reverse when the fourth sequential reversing interface reaches a second preset pressure, and is switched from the fifth sequential reversing interface to the sixth sequential reversing interface, so that the fifth sequential reversing interface is communicated with the fourth sequential reversing interface;

The first interface of the sequence valve is respectively communicated with the first working interface and the fourth sequential interface, and the second interface of the sequence valve is respectively communicated with the fourth working interface and the first sequential interface; the second working interface is communicated with the second conversion interface; the third working interface is communicated with the fifth sequential interface;

The second working interface is communicated with the sequence valve second interface through a first one-way valve, and the first one-way valve is configured to conduct the sequence valve second interface unidirectionally from the second working interface; the third working interface is communicated with the first interface of the sequence valve through a second one-way valve, and the second one-way valve is configured to conduct the first interface of the sequence valve unidirectionally from the third working interface;

the sequence valve further comprises a first pressure regulating device configured to regulate the first preset pressure, or the sequence valve further comprises a second pressure regulating device configured to regulate the second preset pressure;

The first sequence reversing valve part and the second sequence reversing valve part are both of two-position three-way reversing valve structures.

8. The sequential start-up hydraulic system of claim 1, wherein the sensor group comprises one or more of a pressure sensor, an angle sensor, a gravity sensor, a distance sensor, and a speed sensor;

the first executing element, the second executing element and the third executing element are respectively a swinging cylinder or a hydraulic motor;

the sequence valve comprises a sequence valve body; the sequence valve first interface and the sequence valve second interface are both arranged on the sequence valve body;

The control valve group comprises a control valve body; the valve group inlet and the valve group return opening are both arranged on the control valve body, and the first reversing valve part and the second reversing valve part are both arranged in the control valve body.

9. Harvester, characterized by comprising a sequential start hydraulic system according to any one of claims 1-8.

10. The harvester of claim 9, further comprising a body, a side lift and a grain bin; the side lifting device and the grain tank are respectively hinged with the machine body; the first executing element and the third executing element are respectively connected with the machine body;

The first executing element is in driving connection with the side lifting device so that the side lifting device can rotate and lift relative to the machine body;

the second executing element is connected with the side lifting device; the second actuating element drives a folding arm connected with the side lifting device so that the folding arm can be unfolded relative to the machine body;

the third executive component is in driving connection with the grain tank so that the grain tank can turn over relative to the machine body;

The sensor group comprises an initial position sensor for monitoring that the grain tank is at an initial preset position; when the initial position sensor detects that the grain tank is not at an initial preset position, the power supply of the first reversing valve part is disconnected, and the power supply of the second reversing valve part is communicated;

the initial position sensor is an in-place sensor or a distance sensor.