Grain discharging device, method and grain drying tower

Abstract

The application relates to a grain discharging device, a grain discharging method and a grain drying tower, which comprises a grain bin, a storage chamber, a detection chamber and a grain discharging chamber are sequentially arranged in the grain bin from top to bottom, a first plugging piece is arranged between the storage chamber and the detection chamber, the first plugging piece is connected with a first plugging driving piece to realize the switching of the communication and disconnection state between the storage chamber and the detection chamber, a detection element is arranged in the detection chamber, a second plugging piece is arranged between the detection chamber and the grain discharging chamber, the second plugging piece is connected with a second plugging driving piece to realize the switching of the communication and disconnection state between the detection chamber and the grain discharging chamber, the grain discharging device can realize interval grain discharging, can make the grain fully recover and cool, and can guarantee the drying quality of the grain.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of grain processing equipment, in particular to a grain discharging device, method and grain drying tower. BACKGROUND

[0002] The statements herein merely provide background technology related to the present application, and do not necessarily constitute prior art.

[0003] After harvesting, the moisture of the grain is relatively high, and if it is not dried, it is easy to cause mildew, so the grain must reach a safe moisture content before it can be stored or transported. At present, large-scale grain planting areas mostly use grain drying towers to dry the grain. The grain drying tower mainly uses hot air as the drying medium, which can quickly and uniformly reduce the moisture content of the grain, and is suitable for various grain crops. These advantages make the grain drying tower widely used.

[0004] The applicability and rationality of the grain discharging device in the grain drying tower directly affect the working performance and efficiency of the grain drying tower. The traditional grain drying tower mostly uses grain discharging rollers or impeller type grain discharging devices for grain discharging. Both of these two grain discharging devices are continuous and uninterrupted, which can easily cause the grain to be insufficiently cooled and cooled, affecting the drying quality of the grain. Moreover, the grain discharging mode is single, and the grain is discharged through a single discharge port. If the grain does not reach the safe moisture content, manual transportation is required for re-drying. This situation not only increases the cost of labor, but also interrupts the drying process, seriously affecting the working efficiency of the grain drying tower. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a grain discharging device, method and grain drying tower, which can realize intermittent grain discharging and make the grain fully cooled and cooled.

[0006] In order to achieve the above-mentioned purpose, the present application is realized by the following technical scheme:

[0007] In a first aspect, the embodiments of the present application provide a grain discharging device, comprising a grain bin, a storage chamber, a detection chamber and a grain discharging chamber are sequentially arranged from top to bottom in the grain bin, a first blocking member is arranged between the storage chamber and the detection chamber, the first blocking member is connected with a first blocking drive member to realize the switching of the communication and disconnection state between the storage chamber and the detection chamber, a detection element is arranged in the detection chamber, a second blocking member is arranged between the detection chamber and the grain discharging chamber, and the second blocking member is connected with a second blocking drive member to realize the switching of the communication and disconnection state between the detection chamber and the grain discharging chamber.

[0008] Optionally, the bottom end of the storage chamber is provided with a grain discharge port, the first blocking member adopts a conical structure, and the first blocking member can be in contact with the grain discharge port through the conical surface to realize the blocking of the grain discharge port.

[0009] Optionally, the first plugging driving member adopts a first linear telescopic member fixed in the detection chamber by a support, the axis of the first linear telescopic member is vertically arranged, and the telescopic part of the first linear telescopic member is connected with the first plugging member.

[0010] Optionally, the second plugging member comprises a plurality of baffles, one end of each baffle is rotationally connected with the top edge of the grain discharging chamber, the other end of each baffle is hingedly connected with one end of a second linear telescopic member, the other end of the second linear telescopic member is hingedly connected with the inner cavity surface of the grain discharging chamber, and the telescopic movement of the second linear telescopic member can drive the rotation of the baffles to switch the closing and opening states of the grain discharging chamber.

[0011] Alternatively, the second plugging member is provided with a weight detection element.

[0012] Optionally, the detection chamber is in communication with a dust removal channel arranged in the grain bin, and the dust removal channel is connected with a dust removal mechanism.

[0013] Optionally, the grain bin is further provided with a grain returning channel, one end of the grain returning channel is in communication with a grain discharging channel arranged in the grain bin, the other end of the grain returning channel is used to be in communication with an elevator of a grain drying tower, the grain discharging channel is in communication with the detection chamber, a third plugging member is arranged in the grain discharging channel, and the third plugging member is connected with a third plugging driving member to switch the communication and disconnection states of the detection chamber and the grain returning channel.

[0014] Optionally, the grain discharging channel and the dust removal channel are oppositely arranged, the grain bin wall region corresponding to the third plugging member and the end of the grain discharging channel is provided with a vent hole, and the vent hole is provided with a one-way exhaust valve allowing gas to flow from the outside of the grain bin to the inside of the grain bin.

[0015] Optionally, the third plugging driving member adopts a third linear telescopic member fixed in the grain discharging channel, and the end of the telescopic part of the third linear telescopic member is connected with the third plugging member.

[0016] In a second aspect, the embodiments of the present application provide a method of the grain discharging device of the first aspect, comprising the following steps:

[0017] Step 1: the first plugging driving member drives the first plugging member to move, thereby connecting the storage grain chamber and the detection chamber, the grain in the storage grain chamber enters the detection chamber, and after reaching a first set time, the first plugging driving member drives the first plugging member to disconnect the storage grain chamber and the detection chamber.

[0018] Step 2: the detection element in the detection chamber detects the grain.

[0019] Step 3: after the detection is qualified, the second plugging driving member drives the second plugging member to move, thereby connecting the detection chamber and the grain discharging chamber, the grain in the detection chamber enters the grain discharging chamber to be discharged, and after reaching a second set time, the second plugging driving member disconnects the detection chamber and the grain discharging chamber through the second plugging member.

[0020] Cyclically carrying out step 1-step 3 to realize intermittent grain discharge.

[0021] In a third aspect, the embodiments of the present application provide a grain drying tower provided with the grain discharge device of the first aspect.

[0022] The beneficial effects of the present application are as follows:

[0023] 1. The grain discharge device of the present application, by setting the first sealing member, the first sealing driving member, the second sealing member and the second sealing driving member, can make the storage chamber unload grain to the detection chamber, and the discharge chamber unload grain, and further realize the intermittent discharge of the whole grain discharge device, so that the grain can be fully recovered and cooled, and the quality of the grain is improved.

[0024] 2. The grain discharge device of the present application is provided with a grain return channel, a third sealing member and a third sealing driving member, when the grain detection is unqualified, the third sealing driving member can drive the third sealing member to move, and the grain return channel is communicated with the detection chamber, so that the unqualified grain enters the grain return channel, and then enters the grain drying tower again for secondary drying through the elevator, without manual transfer and secondary drying, reducing the labor cost, and without interrupting the drying process of the grain drying tower, ensuring the working efficiency of the grain drying tower.

[0025] 3. The grain discharge device of the present application has a dust removal channel and a dust removal mechanism, which can remove dust from the grain, improve the cleanliness of the grain, and ensure the quality of the grain. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings accompanying the specification of the present application form a part of the specification and serve to further illustrate the illustrative embodiments of the present application and to explain the principles of the present application, and do not constitute an improper limitation of the present application.

[0027] Figure 1 is a schematic diagram of the overall structure of embodiment 1 of the present application;

[0028] Figure 2 is a sectional view of the overall structure of embodiment 1 of the present application;

[0029] Figure 3 is a schematic diagram of the overall structure of embodiment 3 of the present application;

[0030] Figure 4 is a sectional view of the overall structure of embodiment 3 of the present application;

[0031] Among them, 10. Granary, 20. Grain inlet mechanism, 30. Grain discharge mechanism, 40. Grain return mechanism, 50. Detection chamber, 60. Dust removal system, 70. Detection element;

[0032] 21. Grain storage chamber; 22. Grain unloading port; 23. First baffle; 24. First linear telescopic component;

[0033] 31. Grain discharge chamber; 32. Second baffle; 33. Second linear telescopic component;

[0034] 41. Grain discharge channel; 42. Third baffle; 43. Third linear telescopic component; 44. Grain return channel;

[0035] 61. Ventilation hole; 62. Filter screen; 63. Dust removal mechanism. Detailed Implementation

[0036] For ease of description, the words "upper" and "lower" appearing in this invention only indicate that they are consistent with the upper and lower directions of the accompanying drawings and do not limit the structure. They are merely for the purpose of facilitating the description of this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] Example 1

[0038] This embodiment provides a grain discharge device, such as Figures 1-2 As shown, the grain warehouse includes a grain storage chamber 10. Along the grain warehouse from top to bottom, a grain storage chamber 21, a detection chamber 50, and a grain discharge chamber 31 are arranged sequentially inside the grain warehouse.

[0039] The grain storage chamber 21 is coaxially arranged with the grain bin 10 and includes a cylindrical chamber and an inverted conical chamber distributed vertically. The top of the inverted conical chamber is connected to the bottom of the cylindrical chamber, and the bottom of the inverted conical chamber is connected to the detection chamber. A grain unloading port 22 is provided between the bottom of the inverted conical chamber and the grain inlet end of the detection chamber.

[0040] In this embodiment, the unloading port 22 includes a cylindrical part and a conical part arranged from top to bottom, wherein the top end of the cylindrical part is connected to the bottom end of the inverted conical cavity of the grain storage chamber, the bottom end of the cylindrical part is connected to the top end of the conical part, and the bottom end of the conical part is connected to the top end of the detection chamber.

[0041] A first sealing element is provided between the grain storage chamber 21 and the detection chamber 50 to cooperate with the unloading port 22. The first sealing element adopts a positive cone structure composed of multiple first baffles 23, and the shape of the positive cone structure matches the positive cone part of the unloading port 22.

[0042] The first sealing member can move from bottom to top. When the first baffle 22 comes into contact with the surface of the positive conical part of the unloading port 22, it can seal the unloading port 22, thereby disconnecting the grain storage chamber 21 and the detection chamber 50. When the first sealing member moves downward, it can open the unloading port 22, thereby connecting the grain storage chamber 21 and the detection chamber 50.

[0043] In the embodiment, the first sealing member and the positive conical part are conical or triangular pyramidal or quadrangular pyramidal, and those skilled in the art can set them according to actual needs. The sum of the conical angle of the first sealing member and the conical angle of the positive conical part of the grain discharge port 22 is 180°. Preferably, the conical angle of the first sealing member is 45°, and correspondingly, the conical angle of the positive conical part is 135°.

[0044] In order to ensure the sealing effect between the first sealing member and the grain discharge port 22, the outer side surface of the first sealing member is provided with a sealing ring, and the first sealing member can be in close contact with the surface of the positive conical part of the grain discharge port through the sealing ring.

[0045] The first sealing member is connected with the first sealing driving member arranged inside the detection cavity, and the first sealing driving member can drive the first sealing member to move up and down.

[0046] Further, the first sealing driving member adopts a first linear telescopic member 24 coaxially arranged with the grain bin. Preferably, the first linear telescopic member 24 adopts a first air cylinder, and the cylinder body of the first air cylinder is fixed inside the detection bin 50 through a support.

[0047] The support is composed of two support rods arranged in a cross shape. The end portions of the support rods are fixedly connected with the inner cavity surface of the detection cavity 50, and the cylinder body of the first air cylinder is fixed on the upper surface of the intersection position of the two support rods.

[0048] The piston rod of the first air cylinder is fixedly connected with the bottom surface center position of the first sealing member.

[0049] The grain storage cavity, the grain discharge port, the first sealing member, and the first sealing driving member jointly constitute the grain feeding mechanism 20 for receiving the dried grain conveyed from the grain drying tower.

[0050] The detection cavity is provided with a detection element 70, which adopts an existing temperature and humidity sensor for detecting the temperature and humidity of the grain. The temperature and humidity sensor is fixedly connected with the support through a sensor support rod, and the top end of the sensor support rod is fixed with the bottom surface center position of the support.

[0051] The detection cavity 50 includes a first cavity part, a second cavity part, and a third cavity part coaxially arranged from top to bottom. The first cavity part and the third cavity part are both cylindrical cavities, and the cross-sectional area of the first cavity part is larger than that of the third cavity part. The second cavity part is a reverse conical cavity for connecting the first cavity part and the third cavity part.

[0052] The temperature and humidity sensor is arranged inside the first cavity part.

[0053] The bottom end of the third cavity part is in communication with the top end of the grain discharging cavity 31.

[0054] One side of the third cavity part is communicated with one end of a dust removal channel, the dust removal channel is arranged on the wall of the grain storehouse 10, in the embodiment, the dust removal channel is horizontally arranged, the part of the dust removal channel extending to the outside of the grain storehouse 10 is bent downward to connect the other end of the dust removal channel with the dust removal mechanism 63, the dust removal mechanism 63 adopts the existing dust removal equipment with a bidirectional variable frequency fan, and the specific structure is not described in detail here.

[0055] In order to prevent the grain from being sucked into the dust removal air duct, causing the dust removal air duct 61 to be blocked, a filter screen 62 is arranged between the dust removal air duct and the third cavity part, the filter screen 62 can block the grain from entering the dust removal air duct.

[0056] By arranging the dust removal air duct 61 and the dust removal mechanism 63, the dust carried by the grain can be removed, the cleanliness of the grain is improved, and the quality of the grain is improved.

[0057] The third cavity part is provided with a second blocking piece between the third cavity part and the grain discharging cavity 31, the second blocking piece is used for blocking the grain inlet end of the grain discharging cavity 31.

[0058] The second blocking piece is connected with a second blocking driving piece, the second blocking driving piece is used for driving the second blocking piece to move, so as to realize the switching of the open and closed states of the grain discharging cavity and the detection cavity.

[0059] In the embodiment, the second blocking piece adopts two second baffles 32, one end of the second baffle 32 is rotationally connected with the corresponding position of the wall of the grain storehouse 10 at the grain inlet end of the grain discharging cavity 31 through a rotating shaft, the two second baffles 32 can be opened and closed, when opened, the grain discharging cavity 31 is opened, when closed, the two second baffles 32 cover the grain inlet end of the grain discharging cavity 31, and the grain discharging cavity 31 is closed.

[0060] In the embodiment, the second blocking driving piece adopts a second linear extension piece 33, one second linear extension piece 33 is arranged corresponding to each second baffle 32.

[0061] Preferably, the second linear extension piece 33 adopts a second cylinder, the cylinder body of the second cylinder is hinged with the inner cavity surface of the grain discharging cavity 31 through a hinge seat, the piston rod of the second cylinder is hinged with the second baffle 32, and the extension and retraction movement of the piston rod of the second cylinder can drive the second baffle 32 to rotate, so as to realize the switching of the open and closed states of the grain inlet end of the grain discharging cavity.

[0062] Further, the upper surface of the second baffle is provided with a weight detection element, the weight detection element adopts an existing weighing sensor, and is used for detecting the weight of the grain in the detection cavity.

[0063] The grain discharging cavity 31, the second linear extension piece 33 and the second baffle 32 jointly constitute a grain discharging mechanism 30, which is used for discharging qualified grain.

[0064] The grain outlet channel 41 is arranged opposite to the dust removal channel, that is, the grain outlet channel 41 and the dust removal channel are coaxially arranged with an interval of 180°.

[0065] The grain return channel 44 is used to guide the unqualified grain detected by the detection element into the elevator, and then the unqualified grain is re-fed into the grain drying tower for secondary drying by the elevator. In this way, the unqualified grain does not need to be manually transported and dried again, which reduces the labor cost and ensures the working efficiency of the grain drying tower without interrupting the drying process.

[0066] In this embodiment, the grain outlet channel 41 is arranged opposite to the dust removal channel, that is, the grain outlet channel 41 and the dust removal channel are coaxially arranged with an interval of 180°.

[0067] The third blocking piece is arranged between the grain outlet channel 41 and the third cavity part of the detection cavity 50, and the third blocking piece is connected with a third blocking driving piece. The third blocking driving piece can drive the third blocking piece to move, so as to switch the connection and disconnection states of the detection cavity 50 and the grain return channel 41.

[0068] The third blocking piece is a third baffle 42 matched with the shape of the side surface of the third cavity part. The third blocking driving piece is a third linear extension and contraction piece 43. The fixed part of the third linear extension and contraction piece 43 is fixed to the inner side surface of the grain bin 10 corresponding to the outer end part of the grain outlet channel 41, and the axis is arranged horizontally. The extension and contraction part of the third linear extension and contraction piece 43 is connected with the third baffle 42, and can drive the third baffle 42 to move horizontally.

[0069] Preferably, the third linear extension and contraction piece 43 is a third cylinder. The cylinder body of the third cylinder is fixedly connected with the inner side surface of the grain bin 10. The piston rod of the third cylinder is connected with the third baffle 42, and can drive the third baffle 42 to move horizontally.

[0070] When the third baffle 42 moves to the junction position of the grain outlet channel 41 and the third cavity part, the detection cavity 50 is disconnected with the grain outlet channel 41 and the grain return channel 44. When the third baffle 42 is located at other positions, the detection cavity 50 is connected with the grain outlet channel 41 and the grain return channel 44.

[0071] In the embodiment, the third baffle 42 is provided with air holes 61, preferably, the air holes 61 are circular holes, and two air holes 61 are provided, and the corresponding air holes 61 are coaxially arranged on the wall of the silo 10 corresponding to the outer end of the grain outlet channel 41.

[0072] The air holes 61, the dust removal mechanism 62 and the dust removal channel jointly constitute a dust removal system 60 for removing dust from the grain.

[0073] The first air hole and the second air hole are both provided with one-way exhaust valves, and the one-way exhaust valves only allow air flow to flow from the outside of the silo 10 to the inside of the silo 10 in the presence of a pressure difference.

[0074] The grain return channel 44 is further connected with a suction equipment, which can be an existing equipment, and the specific structure is not described in detail here.

[0075] In the embodiment, the grain outlet channel 41, the third baffle 42, the third linear telescopic member 43 and the grain return channel 44 jointly constitute a grain return mechanism 40 for re-feeding the unqualified grain into the grain drying tower for secondary drying.

[0076] In the embodiment, the detection element is connected with the control system, and can transmit the detected temperature and humidity information to the control system, the weighing sensor is connected with the control system, and can transmit the detected grain weight information to the control system, and the first cylinder, the second cylinder and the third cylinder and the dust removal mechanism are all connected with the control system, and are controlled by the control system to work.

[0077] Embodiment 2

[0078] The embodiment provides a method for the grain discharging device of embodiment 1, and the method comprises the following steps:

[0079] Step 1: The grain dried by the grain drying tower enters the grain storage cavity from the top end of the silo for storage, the second blocking member and the third blocking member are in a closed state, the first cylinder drives the first blocking member to move downward, the grain discharging port 22 is opened, and the grain in the grain storage cavity 21 starts to be discharged into the detection cavity 50, when the grain discharging time reaches the first set time, the first cylinder drives the first blocking member to move upward, and the grain discharging port 22 is re-sealed.

[0080] Step 2: The detection element 70 is started, and the temperature and humidity of the grain in the detection cavity 50 are detected.

[0081] Step 3: After the detection element 70 detects that the temperature and humidity of the grain in the detection cavity are qualified, a feedback signal is transmitted to the control system, the control system controls the piston rod of the second cylinder to retract, drives the two second baffles 32 to rotate, opens the grain inlet end of the grain discharge cavity 31 to discharge the grain, and at the same time, the control system starts the dust removal mechanism 63 to work, the bidirectional frequency conversion fan of the dust removal mechanism 63 works according to the dust removal mode, removes the dust in the grain while discharging the grain, and after the grain discharge time reaches the second set time, the control system controls the second cylinder to work, the piston rod of the second cylinder is elongated, drives the two second baffles 32 to rotate, closes the grain inlet end of the grain discharge cavity 31, and then sends a feedback signal to the control system, the control system controls the first cylinder to work, and the first blocking piece opens the grain discharge port 22 to discharge the grain.

[0082] Step 4: Steps 1-3 are cycled to achieve intermittent grain discharge, so that the grain is fully recovered and cooled, the drying quality of the grain is improved, and the uneven grain discharge phenomenon of the traditional grain discharge roller is avoided.

[0083] By controlling the working time and working frequency of the first cylinder and the second cylinder, the controllable grain discharge is realized.

[0084] In step 3, when it is detected that the temperature and humidity of the grain in the detection cavity are unqualified, an abnormal feedback signal is transmitted to the control system, the control system controls the third cylinder to work, the third cylinder drives the third baffle 42 to move, and the detection cavity 50 is connected with the grain outlet channel 41 and the grain return channel 44, and at the same time, the control system controls the air suction equipment to work, and controls the bidirectional frequency conversion fan to work according to the blowing mode, the grain in the detection cavity 50 enters the grain outlet channel 41 and the grain return channel 44 in turn under the action of the wind, and then enters the elevator through the grain return channel 44, and then reenters the grain drying tower for secondary drying, when the weighing sensor detects that the grain completely enters the grain return channel 44, feedback signals are transmitted to the control system in sequence, the control system first controls the third cylinder to work, the third cylinder drives the third baffle 42 to move, and then the first cylinder works, drives the first blocking piece to descend, and opens the grain discharge port 22 to continue discharging the grain. By using this method, the detection and transportation of unqualified grain in the grain bin are realized, the production efficiency is improved, the labor cost is reduced, and the drying quality of the discharged grain is ensured.

[0085] Embodiment 3

[0086] The embodiment provides a grain discharge device, which comprises a grain drying tower, a grain discharge port, a grain discharge cavity, a detection cavity, a detection element, a control system, a first cylinder, a second cylinder and a third cylinder. Figures 3-4As shown, compared with example 1, the only difference is that the first blocking piece is located in the storage cavity, and the movement from top to bottom can cut off the storage cavity and the detection cavity, correspondingly, the inverted cone cavity of the storage cavity is directly connected with the top end of the detection cavity, and the unloading port is omitted, the first blocking piece adopts a right cone structure composed of a plurality of first baffles 23, an inclined surface is arranged at the bottom edge of the first blocking piece, the inclined surface is matched with the cavity surface of the inverted cone cavity of the storage cavity, and after the inclined surface is in contact with the cavity surface of the inverted cone cavity, the storage cavity 21 and the detection cavity 50 can be cut off.

[0087] The sum of the angle between the inclined surface and the vertical and the angle between the cavity surface of the inverted cone cavity and the vertical is 180°, preferably, the angle between the inclined surface and the vertical is 135°, and the angle between the cavity surface of the inverted cone cavity and the vertical is 45°.

[0088] The first linear telescopic piece 24, the second linear telescopic piece 33 and the third linear telescopic piece 43 all adopt hydraulic cylinders.

[0089] The other structures of the embodiment are the same as those of example 1, and will not be repeated here.

[0090] Example 4

[0091] The embodiment provides a method of the grain discharging device described in example 3, compared with example 2, the only difference is that under the driving of the first linear telescopic piece 24, the first blocking piece moves from top to bottom to cut off the storage cavity 21 and the detection cavity 50, the first blocking piece moves from bottom to top to conduct the storage cavity 21 and the detection cavity 50, and other working methods are the same as those of example 2, and will not be repeated here.

[0092] Example 5

[0093] The embodiment provides a grain drying tower, which is provided with the grain discharging device described in example 1 or example 3, and other structures of the grain drying tower can adopt prior art, and will not be described in detail here.

[0094] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, and the present application can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A grain discharging device, comprising a grain bin, a storage chamber, a detection chamber and a discharging chamber are sequentially arranged from top to bottom in the grain bin, a first blocking member is arranged between the storage chamber and the detection chamber, the first blocking member is connected with a first blocking driving member to realize switching of the connection and disconnection state between the storage chamber and the detection chamber, a detection element is arranged in the detection chamber, a second blocking member is arranged between the detection chamber and the discharging chamber, the second blocking member is connected with a second blocking driving member to realize switching of the connection and disconnection state between the detection chamber and the discharging chamber; a grain discharging port is arranged at the bottom end of the storage chamber, the first blocking member adopts a conical structure, and the first blocking member can be in contact with the grain discharging port through the conical surface to realize blocking of the grain discharging port; the first blocking driving member adopts a first linear extension member fixed in the detection chamber through a support, the axis of the first linear extension member is vertically arranged, and the extension part of the first linear extension member is connected with the first blocking member; the second blocking member comprises a plurality of baffles, one end of the baffle is rotationally connected with the top edge of the discharging chamber, the other end of the baffle is hingedly connected with one end of a second linear extension member, the other end of the second linear extension member is hingedly connected with the inner cavity surface of the discharging chamber, and the extension movement of the second linear extension member can drive the baffle to rotate to realize switching of the closing and opening state of the grain inlet end of the discharging chamber by the plurality of baffles; alternatively, the second blocking member is provided with a weight detection element; the grain bin is further provided with a grain returning channel, one end of the grain returning channel is communicated with a grain discharging channel arranged in the grain bin, the other end of the grain returning channel is used for being communicated with an elevator of a grain drying tower, the grain discharging channel is communicated with the detection chamber, a third blocking member is arranged in the grain discharging channel, the third blocking member is connected with a third blocking driving member to realize switching of the connection and disconnection state between the detection chamber and the grain returning channel.

2. A grain unloading device as claimed in claim 1, characterized in that the detection chamber is communicated with a dust removal channel arranged in the grain bin, and the dust removal channel is connected with a dust removal mechanism.

3. A grain unloading device as claimed in claim 2, wherein the grain discharging channel and the dust removal channel are oppositely arranged, the grain bin wall region corresponding to the third blocking member and the end part of the grain discharging channel is provided with a ventilation hole, and the ventilation hole is provided with a one-way exhaust valve allowing gas to flow from the outside of the grain bin to the inside of the grain bin.

4. A grain unloading device as claimed in claim 1, characterized in that the third blocking driving member adopts a third linear extension member fixed in the grain discharging channel, and the extension part of the third linear extension member is connected with the third blocking member.

5. A method of the grain discharge device according to any one of claims 1 to 4, characterized in that, comprising the following steps: step 1: the first blocking driving member drives the first blocking member to move to connect the storage chamber and the detection chamber, the grain in the storage chamber enters the detection chamber, after reaching a first set time, the first blocking driving member drives the first blocking member to disconnect the storage chamber and the detection chamber; step 2: the detection element in the detection chamber detects the grain; step 3: after the detection is qualified, the second blocking driving member drives the second blocking member to move to connect the detection chamber and the discharging chamber, the grain in the detection chamber enters the discharging chamber to discharge the grain, after reaching a second set time, the second blocking driving member disconnects the detection chamber and the discharging chamber through the second blocking member; steps 1-3 are circularly performed to realize intermittent grain discharging.

6. A grain drying tower characterized by, the grain discharging device of any one of claims 1-4 is arranged.

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