Grain fullness switching device and harvester

Abstract

The utility model relates to the technical field of grain fullness detection of harvesters, in particular to a grain fullness switching device and a harvester. One end of the swing arm is rotatably connected with the switch main body, a magnetic material is embedded in the swing arm, a magnetic reed switch is arranged in the switch main body, and the magnetic material and the magnetic reed switch form a non-contact reed switch structure; the swing arm has an initial state and a magnetic attraction state, the swing arm is in the initial state in the natural state, when the swing arm rotates to the magnetic attraction state, the magnetic material drives a circuit in the magnetic reed switch to be closed under the action of the magnetic field of the magnetic material, and the grain fullness switching device is in an open state. The grain loading detection device can accurately monitor and judge whether grains in the grain tank reach a full-load state or not, the problems of misalignment, failure or jamming cannot be generated in the long-term use process, and then the accuracy and reliability of the grain loading detection device cannot be affected.

Description

Technical Field

[0001] The utility model relates to the technical field of grain full detection of a harvester, and particularly relates to a grain full switch device and a harvester. Background Technique

[0002] In the evolution process of modern agriculture, along with the continuous improvement of the mechanization level, the agricultural production mode has undergone a profound transformation. The transformation from primitive manual labor to modern mechanical operation has significantly improved production efficiency. In this context, the combine harvester, as one of the core components of modern agricultural machinery, not only accelerates the process of crop harvesting but also realizes the automation of the harvesting process. With the wide promotion of the application of combine harvesters, the sensor technology equipped thereon has also been continuously iterated and evolved to adapt to the increasingly complex farmland environment for more accurate operation control and crop monitoring.

[0003] Currently, the grain loading detection device in a combine harvester usually presents in the structural form of a rubber pressing disc cooperating with a microswitch. Its working principle is based on the fact that the grain presses the rubber pressing disc, and then transmits the pressure to the microswitch to trigger the switch action, thereby determining whether the grain reaches the full load state. However, this design exposes certain limitations in actual application. Especially after the rubber pressing disc presses the microswitch, there may be a situation where it fails to fully reset. This phenomenon may cause problems such as inaccuracy, failure, or jamming of the microswitch during long-term use, thereby affecting the accuracy and reliability of the grain loading detection device and posing potential fault hazards. Content of the Utility Model

[0004] The purpose of the utility model is to provide a grain full switch device which can accurately monitor and determine whether the grain in the grain tank reaches the full load state, and will not have problems such as inaccuracy, failure, or jamming during long-term use, and thus will not affect the accuracy and reliability of the grain loading detection device.

[0005] Another purpose of the utility model is to provide a harvester which can accurately monitor and determine whether the grain in the grain tank reaches the full load state, and will not have problems such as inaccuracy, failure, or jamming during long-term use, and thus will not affect the accuracy and reliability of the grain loading detection device.

[0006] The technical solution of the utility model is realized as follows:

[0007] A grain full switch device is applied to the grain tank of a harvester and includes a switch main body and a swing arm;

[0008] One end of the swing arm is rotatably connected to the switch main body. The swing arm is embedded with a magnetic material, and a magnetic reed switch is arranged in the switch main body. The magnetic material and the magnetic reed switch form a non-contact dry reed tube structure;

[0009] The swing arm has an initial state and a magnetic attraction state. In its natural state, the swing arm is in the initial state. When the swing arm rotates to the magnetic attraction state, the magnetic material drives the circuit inside the magnetic reed switch to close under the action of its own magnetic field, and the full grain switch device is in an open state.

[0010] Further, the switch body is horizontally arranged with the frame of the harvester;

[0011] The switch body has a swing groove with an opening facing downwards. The upper part of the swing arm is located inside the swing groove and is rotatably connected to the switch body through a rotating shaft.

[0012] Further, one end of the switch body is provided with a receiving cavity, and the magnetic reed switch is arranged inside the receiving cavity;

[0013] The other end of the switch body has a vertical limiting plate. The swing groove is located between the vertical limiting plate and the receiving cavity. In the initial state, the swing arm is in contact with the vertical limiting plate and perpendicular to the frame of the harvester, and the swing arm can swing towards the direction of the magnetic reed switch to make the magnetic material approach the magnetic reed switch.

[0014] Further, when the grain in the grain box accumulates, it will squeeze the swing arm to rotate. The swing angle range of the swing arm is a, satisfying 0° < a ≤ 25°, and the swing arm is at 0° in the initial state. When the swing arm rotates to the position of 25°, it is at the limit position.

[0015] Further, when the grain in the grain box accumulates and makes the swing arm rotate to the position of 11° - 21°, the swing arm is in the magnetic attraction state. The magnetic material drives the circuit inside the magnetic reed switch to close, and the full grain switch device outputs an electrical signal indicating full grain.

[0016] Further, when the grain in the grain box accumulates and makes the swing arm rotate to the position of 25°, the swing arm rotates to the limit position and abuts against the top inside the swing groove.

[0017] Further, when the grain in the grain box decreases, the swing arm droops naturally;

[0018] When the swing arm swings back from the limit position to the position of 5° - 15°, the magnetic material is separated from the magnetic reed switch, and the circuit inside the magnetic reed switch is disconnected. The full grain switch device stops outputting an electrical signal or the full grain switch device outputs an electrical signal indicating that the grain is not full.

[0019] Further, a fixing part is arranged on the side of the switch body for fixedly connecting with the inner wall of the grain box.

[0020] Further, the top of the switch body is an open structure, and a movable cover is arranged on the top of the switch body. The movable cover is connected to the switch body through a plurality of buckle structures.

[0021] A harvester includes a frame and a grain tank, and further includes the grain-full switch device. The grain-full switch device is arranged at the top position inside the grain tank or at a position close to the upper edge of the grain tank.

[0022] Wherein, the switch body and the frame are horizontally arranged, and the swing arm is perpendicular to the frame in the initial state.

[0023] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0024] Through a grain-full switch device, the present application can be installed near the upper edge inside the grain tank, and when installed, the switch body and the frame can be horizontally arranged. When the grain fills the grain tank and forms a conical pile, when the grain piles up more and is nearly full, the grain will contact and squeeze the swing arm, causing the swing arm to deviate and rotate a certain angle towards the direction of the reed switch. Then, the magnetic material will also approach the reed switch accordingly. Furthermore, under the action of its own magnetic field, the magnetic material drives the circuit inside the reed switch to close, and the grain-full switch device is in an open state and outputs an electrical signal indicating that the grain tank is full, so as to accurately detect whether the grain in the grain tank is full. On the contrary, when the grain decreases, the swing arm will naturally swing back to the initial state under the action of gravity. This structural design ensures that even during long-term use, problems such as misalignment, failure, or jamming will not occur, and thus the accuracy and reliability of the grain loading detection device will not be affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a front view structural schematic diagram of the grain-full switch device of the present utility model;

[0027] Figure 2 It is a cross-sectional structural schematic diagram of the grain-full switch device of the present utility model;

[0028] Figure 3 It is a structural schematic diagram of the swing arm of the grain-full switch device of the present utility model when it swings to multiple angles.

[0029] In the figure:

[0030] 1 - Switch body; 101 - Accommodating cavity; 102 - Vertical limiting plate; 103 - Movable cover;

[0031] 2 - Swing arm; 3 - Magnetic material; 4 - Reed switch. Detailed implementation manners

[0032] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. The components of the embodiments of the present utility model usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model claimed, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0034] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0035] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0036] In addition, the terms "horizontal", "vertical", "overhanging", etc. do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0037] In the description of the present utility model, it should also be noted that, unless otherwise clearly specified and defined, the terms "set", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0038] The following will describe in detail some embodiments of the present utility model with reference to the accompanying drawings. Without conflict, the embodiments described below and the features in the embodiments can be combined with each other.

[0039] Embodiment 1

[0040] Refer to Figures 1 - 3 , this embodiment provides a full-grain switch device applied to the grain tank of a harvester, which includes a switch body 1 and a swing arm 2;

[0041] One end of the swing arm 2 is rotatably connected to the switch body 1. A magnetic material 3 is embedded in the swing arm 2, and a reed switch 4 is provided in the switch body 1. The magnetic material 3 and the reed switch 4 form a non-contact reed switch structure;

[0042] The swing arm 2 has an initial state and a magnetic attraction state. The swing arm 2 is in the initial state under natural conditions. When the swing arm 2 rotates to the magnetic attraction state, the magnetic material 3 drives the circuit in the reed switch 4 to close under the action of its own magnetic field, and the full-grain switch device is in the open state.

[0043] Since this embodiment mainly uses the reed switch principle as the full-grain switch, the following will focus on the reed switch magnetic control switch to facilitate a clearer understanding of the working principle of this solution:

[0044] The reed switch magnetic control switch, also known as the reed switch 4 or the magnetic control switch, is an electric switch controlled by a magnetic field. Its structure mainly consists of two soft magnetic metal reed pieces, a glass tube, and an inert gas (such as nitrogen) filled inside. The two metal reed pieces are usually made of magnetic materials 3 such as iron and nickel. They are sealed in a glass tube and arranged in an overlapping manner, with a tiny gap left in the middle. The size of this gap is usually between a few micrometers and dozens of micrometers, which is the key to the normal operation of the reed switch magnetic control switch.

[0045] The working principle of the reed switch is based on the magnetization effect of the magnetic field on the metal reed. When an external magnetic field approaches, the metal reed will be magnetized and generate different polarities. When the magnetic field strength is large enough, the attraction between the two reeds will exceed the elastic force between them, causing the reeds to attract and contact each other, thus closing the circuit and making the switch in the conducting state. On the contrary, when the external magnetic field disappears or weakens, the reed will gradually demagnetize and return to its original shape, causing the contact between them to break, the circuit to break, and the switch to be in the off state.

[0046] Specifically, the working process of the reed switch can be divided into the following steps:

[0047] 1. No magnetic field state: In the absence of an external magnetic field, the two metal reeds are in a free state, the gap between them remains unchanged, and the circuit is in the off state.

[0048] 2. Magnetic field approaching: When an external magnetic field approaches, the metal reed begins to be magnetized and generates different polarities. At this time, the attraction between the two reeds gradually increases.

[0049] 3. Reed contact: When the magnetic field strength is large enough, the attraction between the two metal reeds exceeds the elastic force between them, causing the reeds to attract and contact each other. At this time, the circuit is closed, and the switch is in the conducting state or the on state.

[0050] 4. Magnetic field disappearing or weakening: When the external magnetic field disappears or weakens, the metal reed gradually demagnetizes and returns to its original shape. At this time, the contact between the two reeds breaks, the circuit breaks, and the switch is in the off state.

[0051] Therefore, in this embodiment, when the magnetic material 3 approaches the reed switch 4, a magnetic field is provided to the reed switch 4, and the two metal reeds in the reed switch 4 begin to be magnetized and generate different polarities. At this time, the attraction between the two metal reeds gradually increases and they attract and close the circuit, and the full grain switch device is in the on state and outputs an electrical signal to feedback the full grain signal. On the contrary, when the magnetic material 3 moves away from the reed switch 4, the magnetic field provided to the reed switch 4 gradually disappears, and the two metal reeds in the reed switch 4 gradually lose their magnetism. At this time, the attraction between the two metal reeds gradually decreases and they separate and open the circuit, and the full grain switch device is in the off state, indicating that the grain is not fully loaded.

[0052] When the full grain switch device is actually installed in the grain bin, it can be installed at the top of the grain bin or near the upper edge of the grain bin. Since the grain accumulates in a conical shape in the grain bin, and the grain bin is divided into a grain bin with a cover and a grain bin with an open top (without a cover), the installation positions of the grain bin switch device for these two types of grain bins are described separately below:

[0053] 1. When the top of the grain bin is not equipped with a cover and during the process of grain accumulation (the grain bin has no cover), the top of the grain may or may not exceed the grain bin. Therefore, the user needs to define the specific installation position of the full-grain switch device according to the actual situation. In short, the user needs to determine at which position the grain accumulation reaches the full-grain state, and then install the full-grain switch device at the highest position (junction point) where the grain contacts the inner wall of the grain bin. And when installing the full-grain switch device, it should be noted that the swing arm 2 is closer to the center of the grain bin than the reed switch 4, so that during the grain accumulation process, the grain will first squeeze the swing arm 2 and cause the swing arm 2 to rotate towards the direction of the reed switch 4.

[0054] 2. When the top of the grain bin is already equipped with a cover (the grain bin has a cover), an inlet can also be opened at the top of the grain bin, and the grain can enter from the top inlet and be stored in the grain bin. In the case of such a grain bin structure, during the grain accumulation process, the grain first accumulates in a conical state. When the grain accumulates and abuts against the top cover, under the blocking effect of the cover, the continuously stored grain will fill the voids in the grain bin, and when it is almost filled, the grain will squeeze the swing arm 2 and rotate towards the direction of the reed switch 4; And when installing the full-grain switch device, it should be noted that if the inlet is set at the center position of the top of the grain bin or near its center position at the top, then when installing the full-grain switch device, its swing arm 2 is set closer to the center of the grain bin than the reed switch 4, so that during the grain accumulation process, the grain will first squeeze the swing arm 2 and cause the swing arm 2 to rotate towards the direction of the reed switch 4; if the inlet is set on one side of the grain bin, then when installing the full-grain switch device, it is preferably installed at the top of the other side of the grain bin (the full-grain switch device is far from the inlet and opposite to the inlet), so as to ensure that the grain bin is filled with grain to the greatest extent.

[0055] Regardless of whether the grain bin has a cover or not, when the full-grain switch device is installed on the inner wall of the grain bin, it is preferably arranged horizontally with the switch body 1 of the switch and the frame of the harvester. In the horizontal state of the switch body 1, it has a swing groove with an opening facing downwards. The upper part of the swing arm 2 is located in the swing groove and is rotatably connected to the switch body 1 through a rotating shaft. The swing arm 2 can rotate or swing around the rotating shaft in the swing groove.

[0056] In this embodiment, a receiving cavity 101 is provided at one end of the switch body 1, and the reed switch 4 is arranged inside the receiving cavity 101, and the reed switch 4 is arranged at the position closest to the swing arm 2;

[0057] The other end of the switch body 1 has a vertical limiting plate 102, which is part of the structure of the switch body 1 itself and is mainly used to block the swing arm 2 for limiting it. Between the vertical limiting plate 102 and the accommodating cavity 101 is the swing groove. In the initial state of the swing arm 2, due to the limiting effect of the vertical limiting plate 102, the swing arm 2 is in contact with the vertical limiting plate 102 and perpendicular to the frame of the harvester, and the swing arm 2 can swing towards the direction of the reed switch 4 to bring the magnetic material 3 close to the reed switch 4.

[0058] Preferably, the magnetic material 3 can be a magnet, and the magnet can be arranged on the swing arm 2 and close to the position of the reed switch 4.

[0059] When the grain in the grain tank accumulates, it will squeeze the swing arm 2 to rotate. The swing angle range of the swing arm 2 is a, satisfying 0° < a ≤ 25°, and the swing arm 2 is at 0° in the initial state, and at this time the swing arm 2 is perpendicular to the frame; when the swing arm 2 rotates to the position of 25°, it is at the limit position.

[0060] In this embodiment, when the grain in the grain tank accumulates and makes the swing arm 2 rotate to the position of 11° - 21°, the swing arm 2 is in the magnetic attraction state, the magnetic material 3 drives the circuit in the reed switch 4 to close, and the full grain switch device outputs an electric signal of full grain, so that the operator can know in time that the grain is fully loaded. For example, the full grain switch device can be electrically connected to the main control system of the harvester. The full grain switch device outputs an electric signal of full grain to the main control system, and then issues an alarm to remind the operator that the grain is fully loaded.

[0061] When the grain in the grain tank accumulates and makes the swing arm 2 rotate to the position of 25°, the swing arm 2 rotates to the limit position and abuts against the top inside the swing groove. At this time, it is the limit position of the rotation of the swing arm 2.

[0062] When the grain in the grain tank decreases, the swing arm 2 naturally droops due to gravity, and after the swing arm 2 swings back 15° ± 5° from the limit position (that is, when the swing arm 2 swings back from the limit position to the position of 5° - 15°), the magnetic material 3 is separated from the reed switch 4, and the circuit in the reed switch 4 is disconnected. The full grain switch device stops outputting an electric signal or the full grain switch device outputs an electric signal of not full grain to the main control system, so that the operator can know in time the signal of not full grain.

[0063] A fixing part is arranged on the side of the switch body 1 for fixedly connecting with the inner wall of the grain tank.

[0064] The top of the switch body 1 is an open structure, and a movable buckle cover 103 is arranged on the top of the switch body 1. The movable buckle cover 103 is connected to the switch body 1 through a plurality of buckle structures. When the movable buckle cover 103 is arranged on the top of the switch body 1, when the swing arm 2 rotates to the position of 25°, the swing arm 2 rotates to the limit position and abuts against the bottom of the movable buckle cover 103.

[0065] Embodiment 2

[0066] A harvester includes a frame, a grain tank, and the above-mentioned full grain switch device. The full grain switch device is arranged at the top position inside the grain tank or near the upper edge of the grain tank. It should be noted that the actual installation position of the full grain switch device needs to be determined according to whether the grain tank has a cover or customized by the user, which has been described in Embodiment 1 and will not be elaborated here.

[0067] Wherein, the switch body 1 and the frame are horizontally arranged, and the swing arm 2 is perpendicular to the frame in the initial state.

[0068] The beneficial effects of the technical solution of the present utility model are:

[0069] In this application, a full grain switch device can be installed near the upper edge inside the grain tank, and when installed, the switch body 1 and the frame can be horizontally arranged. When the grain fills the grain tank and forms a conical pile, when the grain accumulates more and is nearly full, the grain will contact and squeeze the swing arm 2, causing the swing arm 2 to deviate and rotate a certain angle towards the direction of the reed switch 4, and then the magnetic material 3 will also approach the reed switch 4 accordingly. Furthermore, under the action of its own magnetic field, the magnetic material 3 drives the circuit inside the reed switch 4 to close, and the full grain switch device is in an open state and outputs an electrical signal of full grain, so as to accurately detect whether the grain in the grain tank is full. On the contrary, when the grain decreases, the swing arm 2 will naturally swing back to the initial state under the action of gravity. This structural design ensures that it will not produce problems such as misalignment, failure, or jamming even during long-term use, and thus will not affect the accuracy and reliability of the detection of full grain.

[0070] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model.

[0071] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A full-grain switch device is applied to the grain tank of a harvester, and is characterized in that, It includes a switch body (1) and a swing arm (2); One end of the swing arm (2) is rotatably connected to the switch body (1). A magnetic material (3) is embedded in the swing arm (2), and a magnetic reed switch (4) is provided in the switch body (1). The magnetic material (3) and the magnetic reed switch (4) form a non-contact dry reed switch structure; The swing arm (2) has an initial state and a magnetic attraction state. The swing arm (2) is in the initial state under natural conditions. When the swing arm (2) rotates to the magnetic attraction state, the magnetic material (3) drives the circuit in the magnetic reed switch (4) to close under the action of its own magnetic field, and the full grain switch device is in the open state.

2. The full-grain switch device according to claim 1, characterized in that, The switch body (1) is horizontally arranged with the frame of the harvester; The switch body (1) has a swing slot with an opening facing downwards. The upper part of the swing arm (2) is located in the swing slot and is rotatably connected to the switch body (1) through a rotating shaft.

3. The grain-full switch device according to claim 2, wherein One end of the switch body (1) is provided with a receiving cavity (101), and the magnetic reed switch (4) is arranged inside the receiving cavity (101); The other end of the switch body (1) has a vertical limiting plate (102). The swing slot is between the vertical limiting plate (102) and the receiving cavity (101). The swing arm (2) is in contact with the vertical limiting plate (102) and perpendicular to the frame of the harvester in the initial state, and the swing arm (2) can swing towards the direction of the magnetic reed switch (4) to make the magnetic material (3) close to the magnetic reed switch (4).

4. The full-grain switch device according to claim 3, characterized in that, When the grain in the grain box accumulates, it will squeeze the swing arm (2) to rotate. The swing angle range of the swing arm (2) is a, satisfying 0° < a ≤ 25°. And the swing arm (2) is at 0° in the initial state, and the swing arm (2) is at the limit position when it rotates to the 25° position.

5. The full-grain switch device according to claim 4, characterized in that, When the grain in the grain box accumulates and makes the swing arm (2) rotate to the position of 11° - 21°, the swing arm (2) is in the magnetic attraction state. The magnetic material (3) drives the circuit in the magnetic reed switch (4) to close, and the full grain switch device outputs an electric signal indicating full grain.

6. The full-grain switch device according to claim 4, characterized in that When the grain in the grain box accumulates and makes the swing arm (2) rotate to the 25° position, the swing arm (2) rotates to the limit position and abuts against the top inside the swing slot.

7. The full-grain switch device according to claim 4, characterized in that, When the grain in the grain box decreases, the swing arm (2) droops naturally; When the swing arm (2) swings back from the limit position to the position of 5° - 15°, the magnetic material (3) is separated from the magnetic reed switch (4), and the circuit in the magnetic reed switch (4) is disconnected. The full grain switch device stops outputting an electric signal or the full grain switch device outputs an electric signal indicating that the grain is not full.

8. The full-grain switch device according to claim 1, characterized in that, A fixing part is provided on the side of the switch body (1) for fixedly connecting with the inner wall of the grain box.

9. The grain-full switch device according to claim 1, characterized in that, The top of the switch body (1) is an open structure, and a movable buckle cover (103) is provided on the top of the switch body (1). The movable buckle cover (103) is connected to the switch body (1) through a plurality of buckle structures.

10. A harvester, comprising a frame and a grain tank, characterized in that, It further includes the full-grain switch device according to any one of claims 1-9, and the full-grain switch device is arranged at the top position inside the grain bin or at a position close to the upper edge of the grain bin; Wherein, the switch body (1) is horizontally arranged with the vehicle frame, and the swing arm (2) is perpendicular to the vehicle frame in the initial state.

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