Flexible grain intake control system and method

Abstract

The application discloses a kind of grain flexible warehouse entry control system and method, it is driven platform drive cloth grain ware is raised and lowered on center column, can be aligned with the discharge port of different height layer on center column, and by detecting the lifting position of cloth grain ware, the grain heap height at the grain falling point of middle cloth grain groove, the grain heap height at the grain falling point of far cloth grain groove, according to the detection result control drive platform drive cloth grain ware to be raised and lowered adjustment, so that grain is entered according to from bottom to top layer by layer feeding and each layer feeding is evenly fed from silo periphery to silo center The way of warehouse, since it is from bottom to top layer by layer feeding mode, reduce the grain warehouse falling height, thereby reduce the grain breakage rate and grain loss, and each layer feeding is evenly fed from silo periphery to silo center The way, realize each layer evenly feeding, so that silo grain heap distribution is uniform, greatly reduce the silo operation amount, thereby realize grain flexible warehouse entry.

Description

Technical Field

[0001] This invention relates to the field of grain storage technology, and in particular, to a flexible grain storage control system and method. Background Technology

[0002] The existing method of grain silo loading involves feeding material from the top of the silo using conveyor machinery. Since the silo has only one fixed top inlet, located roughly in the center, the material falls freely from top to bottom. Due to differences in grain size, weight, and shape, as well as the presence of impurities, the grain in the silo undergoes severe automatic grading, leading to localized concentrations of moisture and impurities, making the grain prone to mold and insect infestation. Therefore, to address the problem of automatic grain grading, a grain distributor is typically installed at the top inlet. This distributor consists of multiple circumferentially distributed grain distribution troughs. Each trough group includes a distal grain distribution trough and a central grain distribution trough arranged parallel to each other. The grain drop point of the distal grain distribution trough is located near the outer perimeter of the silo, while the grain drop point of the central grain distribution trough is located near the center. After entering through the inlet, the grain is distributed through multiple sets of distal and central grain distribution troughs, which to some extent solves the problem of automatic grain grading. However, since the grain distributor is fixedly installed at the feed inlet on the top of the silo, the grain enters the silo from a high position on the top of the silo, resulting in a high drop height, which leads to a large grain breakage rate and a large grain loss. In addition, the grain pile inside the silo is unevenly tilted, requiring manual leveling, which involves a large amount of leveling work. Summary of the Invention

[0003] This invention provides a flexible grain storage control system and method, which can reduce the grain breakage rate and grain loss during storage, and can also make the grain pile in the silo evenly distributed, greatly reducing the amount of leveling work, thereby realizing flexible grain storage.

[0004] According to one aspect of the present invention, a flexible grain feeding control system is provided, comprising a drive platform, a grain distributor, a ranging element, a mid-level material level detection element, a far-level material level detection element, and a controller. The drive platform is fixedly installed on the top of the silo and driven by the grain distributor for driving the grain distributor to rise and fall. The ranging element is installed on the drive platform for detecting the rising and falling position of the grain distributor. The drive platform is equipped with an outwardly extending first mounting plate and a second mounting plate, which are circumferentially staggered. The mid-level material level detection element is installed on the first mounting plate for detecting… The height of the grain pile at the grain drop point of the grain distribution trough of the grain distributor is measured by the height of the grain pile at the grain drop point of the grain distribution trough of the grain distributor. The remote material level detection element is installed on the second mounting plate and is used to detect the height of the grain pile at the grain drop point of the grain distribution trough of the grain distributor. The controller is electrically connected to the drive platform, the ranging element, the mid-mouth material level detection element and the remote material level detection element. It is used to issue control commands to the drive platform based on the detection results of the ranging element, the mid-mouth material level detection element and the remote material level detection element, so as to drive the grain distributor to adjust the lifting position, so that the grain is fed into the silo layer by layer from bottom to top and each layer is fed evenly from the outside of the silo to the center of the silo.

[0005] Furthermore, during the process of feeding material layer by layer from bottom to top, the controller first controls the drive platform to drive the grain distributor to descend, and detects the descending position of the grain distributor through the ranging element to determine whether the grain distributor is aligned with the position of the lowest layer's discharge port on the central column. After the uniform feeding of the lowest layer is completed, the controller then controls the drive platform to drive the grain distributor to rise to align with the discharge port of the next layer, and repeats the above process continuously until the grain distributor rises to the position of the highest layer's discharge port.

[0006] Furthermore, during the feeding process of each layer, the controller first controls the drive platform to drive the grain distributor to rise and fall, so that the position of the far-mouth grain distributor trough is aligned with the position of the discharge port of that layer. It then determines whether the grain pile height detected by the far-mouth material level detection element has reached a preset height value. If it has reached the preset height value, the controller then controls the drive platform to drive the grain distributor to move upward, so that the position of the middle-mouth grain distributor trough is aligned with the position of the discharge port of that layer. It then determines whether the grain pile height detected by the middle-mouth material level detection element has reached a preset height value. If it has reached the preset height value, the controller then controls the drive platform to drive the grain distributor to move upward, so that the far-mouth grain distributor trough is aligned with the discharge port of the previous layer. During the upward movement of the grain distributor, grain falls from the discharge port of that layer.

[0007] Furthermore, when the ranging element detects that the lifting position of the grain distributor is aligned with the position of the discharge port of the highest layer, and both the middle-level material level detection element and the far-level material level detection element detect that the grain pile height has reached the preset height value, the controller determines that the silo is full and controls the feeding to stop.

[0008] Furthermore, each gate at the discharge port on the central column is driven by a dual-stroke drive element. A first material detection element is installed above the highest discharge port on the central column, and a second material detection element is installed below the highest discharge port. Both the first and second material detection elements are electrically connected to the controller. When the second material detection element does not detect material, the controller controls the dual-stroke drive element to retract to close the gate. When the second material detection element detects material and the first material detection element does not detect material, the controller controls the dual-stroke drive element to extend to the first stroke to partially open the gate. When the first material detection element detects material, the controller controls the dual-stroke drive element to extend to the second stroke to fully open the gate.

[0009] Furthermore, each discharge port on the central column is equipped with an air jet nozzle, and the controller is also used to control the air jet nozzle to spray airflow when the gate of each discharge port is opened, so as to break the grain arching at the discharge port.

[0010] Furthermore, during the lifting and lowering process of the grain distributor, the controller is also used to calculate the lower edge height values ​​of the middle grain distribution trough and the far grain distribution trough based on the detection results of the ranging element, and control the drive platform to adjust the lifting and lowering speed of the grain distributor based on the calculated lower edge height values, so as to ensure that the middle grain distribution trough or the far grain distribution trough is aligned with the discharge port.

[0011] Furthermore, during the descent of the grain distributor, if the lower edge height of the middle or far-mouth grain trough is greater than or equal to a first preset height value, the controller controls the drive platform to drive the grain distributor to move rapidly downwards. If the lower edge height of the middle or far-mouth grain trough is less than the first preset height value, the controller controls the drive platform to reduce the downward speed of the grain distributor. If the lower edge height of the middle or far-mouth grain trough is greater than a second preset height value, the controller controls the drive platform to further reduce the downward speed of the grain distributor. If the lower edge height of the middle or far-mouth grain trough is greater than or equal to a third preset height value and less than or equal to a second preset height value, the controller controls the drive platform to stop driving the grain distributor to rise and fall.

[0012] During the upward movement of the grain distributor, if the lower edge height of the middle or far-mouth grain trough is less than a fourth preset height, the controller controls the drive platform to drive the grain distributor to move upward rapidly. If the lower edge height of the middle or far-mouth grain trough is greater than or equal to the fourth preset height, the controller controls the drive platform to reduce the upward speed of the grain distributor. If the lower edge height of the middle or far-mouth grain trough is less than a third preset height, the controller controls the drive platform to further reduce the upward speed of the grain distributor. If the lower edge height of the middle or far-mouth grain trough is greater than or equal to the third preset height and less than or equal to the second preset height, the controller controls the drive platform to stop driving the grain distributor to rise and fall.

[0013] Furthermore, a limit switch is also provided at the bottom of the drive platform. The limit switch is electrically connected to the controller. The controller is also used to issue an alarm reminder and / or control the drive platform to drive the grain distributor to descend when the grain distributor rises and triggers the limit switch.

[0014] In addition, the present invention also provides a flexible grain storage control method, which adopts the flexible grain storage control system described above, and includes the following:

[0015] Detect the lifting position of the grain distributor and determine whether the grain distributor is aligned with the discharge port of the target layer;

[0016] After the grain distributor is aligned with the discharge port of the target layer, the height of the grain pile at the grain drop point of the middle and far grain distribution troughs of the grain distributor is detected, and the grain distributor is raised and lowered according to the two grain pile height detection results, so that the grain is fed evenly from the outside of the silo to the center of the silo when it enters the target layer.

[0017] After controlling the grain distributor to rise and align with the discharge port of the upper layer, repeat the above process so that the grain is fed into the warehouse layer by layer from bottom to top.

[0018] The present invention has the following beneficial effects:

[0019] The flexible grain feeding control system of this invention uses a drive platform to drive a grain distributor to rise and fall on a central column, aligning it with the discharge ports at different heights on the central column. The system uses a ranging element to detect the rising and falling position of the grain distributor, a central level detection element to detect the grain pile height at the grain drop point of the central grain trough, and a distant level detection element to detect the grain pile height at the grain drop point of the distant grain trough. Based on the detection results from these elements, the drive platform is controlled to adjust the raising and lowering of the grain distributor, ensuring that the grain is fed into the silo layer by layer from bottom to top, with each layer fed evenly from the outer perimeter of the silo to its center. This bottom-to-top layer-by-layer feeding method reduces the grain drop height, thereby reducing grain breakage and loss. Furthermore, the even feeding method from the outer perimeter of the silo to its center ensures uniform grain distribution within the silo, significantly reducing the amount of leveling work and thus achieving flexible grain feeding.

[0020] In addition, the flexible grain storage control method of the present invention also has the above-mentioned advantages.

[0021] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0023] Figure 1 This is a front cross-sectional view of the structural layout of the grain flexible storage control system in the silo according to a preferred embodiment of this application;

[0024] Figure 2 This is a top view schematic diagram of the structural layout of the grain flexible storage control system in a silo according to a preferred embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the network structure of the grain depot storage local area network according to a preferred embodiment of this application;

[0026] Figure 4 This is a flowchart illustrating another embodiment of the flexible grain storage control method of this application.

[0027] Explanation of reference numerals in the attached figures

[0028] 1. Drive platform; 2. Grain distributor; 3. Distance measuring element; 4. Middle-end material level detection element; 5. Far-end material level detection element; 6. First mounting plate; 7. Second mounting plate; 8. First material detection element; 9. Second material detection element; 11. Limit switch; 100. Central column; 101. Discharge port; 21. Middle-end grain distributor trough; 22. Far-end grain distributor trough. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] Reference Figure 1 and Figure 2 As shown, a preferred embodiment of this application provides a flexible grain storage control system, which includes a drive platform 1, a grain distributor 2, a distance measuring element 3, a middle-mouth material level detection element 4, a far-mouth material level detection element 5, and a controller. The drive platform 1 is fixedly installed on the top of the silo and driven to connect with the grain distributor 2, used to drive the grain distributor 2 to rise and fall. The drive platform 1 is equipped with four chain hoists, a pneumatic motor, and a reducer, and synchronously drives the four hoists to move up and down through universal couplings. All four hoists are connected to the grain distributor 2, and the connection points on the grain distributor 2 are evenly distributed circumferentially to ensure smooth lifting and lowering of the grain distributor 2. Of course, in other embodiments of the present invention, the drive platform 1 can also use other linear drive mechanisms to connect with the grain distributor 2, such as a gear and rack drive mechanism, a sprocket and chain drive mechanism, etc., which are not specifically limited here. The ranging element 3 is mounted on the drive platform 1 and is used to detect the lifting position of the grain distributor 2. The ranging element 3 can be an ultrasonic ranging sensor, a rope ranging sensor, or a laser ranging sensor, with a rope ranging sensor being preferred. Specifically, the ranging element 3 is mounted on the lower edge of the drive platform 1, and it can detect the distance Hp1 between the lower edge of the drive platform 1 and the rope fixing point on the grain distributor 2. When the grain distributor 2 is at its lowest point, the distance value at this point is calibrated as Hp1. max When the grain distributor 2 is at its highest point, the distance value at this time is calibrated to be Hp1. min Therefore, the controller can determine the real-time lifting position of the grain distributor 2 by using the real-time distance value Hp1 detected by the ranging element 3, and can also control the lifting range of the grain distributor 2 based on the real-time distance value Hp1, that is, the real-time distance value Hp1 must be greater than or equal to Hp1. min And less than or equal to Hp1 max To prevent the grain distributor 2 from lifting beyond its limit.

[0031] The drive platform 1 is equipped with an outwardly extending first mounting plate 6 and a second mounting plate 7. The first mounting plate 6 and the second mounting plate 7 are at the same installation height and are circumferentially staggered. The central level detection element 4 is mounted on the first mounting plate 6 and is used to detect the grain pile height at the grain drop point of the central grain trough 21 of the grain distributor 2. The distal level detection element 5 is mounted on the second mounting plate 7 and is used to detect the grain pile height at the grain drop point of the distal grain trough 22 of the grain distributor 2. It is understood that since the central grain trough 21 on the grain distributor 2 is located directly below the distal grain trough 22, the first mounting plate 6 and the second mounting plate 7 need to be circumferentially staggered to ensure that the grain pile height at the grain drop points of both the central and distal grain troughs 21 and 22 can be detected simultaneously. Preferably, the central level detection element 4 and the distal level detection element 5 are high-frequency radar level gauges. Of course, in other embodiments of the present invention, a ranging sensor can also be used to detect the grain pile height.

[0032] It is understood that the central column 100 is provided with multiple layers of discharge ports 101, each layer including multiple discharge ports 101 evenly distributed circumferentially. The number of grain distribution trough groups on the grain distributor 2 is consistent with the number of discharge ports 101 in each layer. When the grain distributor 2 is aligned with the discharge port 101 of a certain layer, the middle-mouth grain distribution trough 21 or the far-mouth grain distribution trough 22 in each grain distribution trough group is aligned with a discharge port 101 to achieve uniform material distribution. The number of far-mouth material level detection elements 5 is consistent with the number of far-mouth grain distribution troughs 22, and the number of middle-mouth material level detection elements 4 can be appropriately reduced, preferably consistent with the number of middle-mouth grain distribution troughs 21. Of course, in other embodiments of the present invention, the number of layers of discharge ports 101 on the central column 100 can be set as needed, and the number of discharge ports 101 included in each layer can also be set as needed. The number of grain distribution trough groups, the number of middle-mouth material level detection elements 4, and the number of far-mouth material level detection elements 5 on the grain distributor 2 need to be adjusted adaptively.

[0033] In a preferred embodiment of the present invention, the central column 100 is provided with five layers of discharge ports 101, each layer including four discharge ports 101 evenly distributed circumferentially. The grain distributor 2 includes four grain distribution trough groups evenly distributed circumferentially. Each grain distribution trough group includes a middle grain distribution trough 21 and a far grain distribution trough 22 arranged vertically. The middle grain distribution trough 21 is located directly below the far grain distribution trough 22. The orientation of the four grain distribution trough groups corresponds one-to-one with the orientation of the four discharge ports 101 in each layer, ensuring that each grain distribution trough group can correspond to one discharge port 101 in each layer to achieve uniform material distribution. The number of far-mouth material level detection elements 5 is four, and the number of middle-mouth material level detection elements 4 is two. One middle-mouth material level detection element 4 is located in the middle of two adjacent middle-mouth material distribution troughs 21, and the two middle-mouth material level detection elements 4 are symmetrically arranged. Four remote level detection elements 5 detect distances of Hy1, Hy2, Hy3, and Hy4 between themselves and the grain pile at the grain drop point of the remote grain distribution trough 22. Two intermediate level detection elements 4 detect distances of Hz1 and Hz2 between themselves and the grain pile at the grain drop point of the intermediate grain distribution trough 21. Since the distances from the intermediate level detection elements 4 and remote level detection elements 5 to the silo floor can be measured beforehand, they are Hy1... max Hy2 max Hy3 max Hy4 max Hz1 max and Hz2 max Therefore, the grain pile height values ​​corresponding to the four remote material level detection elements 5 are respectively (Hy1 max - Hy1), (Hy2) max - Hy2), (Hy3) max - Hy3), (Hy4) max - Hy4), the grain pile height values ​​corresponding to the two mid-level material level detection elements 4 are respectively (Hz1) max - Hz1) and (Hz2) max - Hz2). Of course, in other embodiments of the present invention, the installation height of the four distal material level detection elements 5 can be set to be the same, and the installation height of the two intermediate material level detection elements 4 can be set to be the same, i.e., Hy1 max =Hy2 max =Hy3 max =Hy4 max Hz1 max =Hz2 max .

[0034] The controller is electrically connected to the drive platform 1, the ranging element 3, the central material level detection element 4, and the distal material level detection element 5. It issues control commands to the drive platform 1 based on the detection results of the ranging element 3, the central material level detection element 4, and the distal material level detection element 5. This commands drive the grain distributor 2 to adjust its lifting position, ensuring that grain is fed into the silo layer by layer from bottom to top, with each layer feeding evenly from the outer perimeter of the silo to its center. The controller can be integrated into the drive platform 1 or installed separately, for example, at the silo entrance. It is understood that, since the central column 100 is provided with at least one layer of discharge ports 101, the controller can detect the lifting position of the grain distributor 2 through the ranging element 3 to determine whether the grain distributor 2 is aligned with the discharge port 101 of the target layer, so that the grain is evenly distributed through the grain distributor 2. Moreover, when feeding the target layer, the controller can also control the grain distributor 2 to make fine adjustments to its lifting position based on the grain pile height detection results of the middle-mouth material level detection element 4 and the far-mouth material level detection element 5, so that the grain can switch between the far-mouth grain distribution trough 22, the middle-mouth grain distribution trough 21 and the discharge port 101, so that the grain is evenly fed from the outside of the silo to the center of the silo when entering the target layer. After the target layer feeding is completed, the controller controls the grain distributor 2 to rise and align with the discharge port 101 of the next layer and repeats the above process, so that the grain enters the silo layer by layer from bottom to top. By repeatedly performing the above process, grain can be fed into the silo layer by layer from bottom to top, with each layer fed evenly from the outer perimeter of the silo to the center. This greatly reduces the height of the grain as it enters the silo, thereby significantly reducing grain loss. Furthermore, the grain piles inside the silo are evenly distributed, and manual leveling is basically unnecessary.

[0035] It is understood that the flexible grain storage control system of this embodiment drives the grain distributor 2 to rise and fall on the central column 100 via the drive platform 1, so that it can be aligned with the discharge ports 101 at different heights on the central column 100. The system uses a ranging element 3 to detect the rising and falling position of the grain distributor 2, a central level detection element 4 to detect the grain pile height at the grain drop point of the central grain trough 21, and a remote level detection element 5 to detect the grain pile height at the grain drop point of the remote grain trough 22. Based on the data from the ranging element 3, the central level detection element 4, and the remote level detection element... The detection results of component 5 control the drive platform 1 to drive the grain distributor 2 to adjust its height, so that the grain is fed into the silo layer by layer from bottom to top, and each layer is fed evenly from the outside of the silo to the center of the silo. Because the grain is fed layer by layer from bottom to top, the drop height of the grain into the silo is reduced, thereby reducing the grain breakage rate and grain loss. In addition, the uniform feeding method from the outside of the silo to the center of the silo achieves uniform feeding of each layer, making the grain pile in the silo evenly distributed, greatly reducing the amount of leveling work, thus realizing flexible grain storage.

[0036] It is understood that during the bottom-to-top layer-by-layer feeding process, the controller first controls the drive platform 1 to drive the grain distributor 2 downwards, and detects the downward position of the grain distributor 2 through the ranging element 3 to determine whether the grain distributor 2 is aligned with the position of the lowest layer's discharge port 101 on the central column 100. After completing the uniform feeding of the lowest layer, the controller then controls the drive platform 1 to drive the grain distributor 2 upwards to align with the discharge port 101 of the next layer, and repeats the above process until the grain distributor 2 rises to the position of the highest layer's discharge port 101. It is understood that by adopting the bottom-to-top layer-by-layer feeding method, the grain drop height into the silo can be reduced, thereby reducing the grain breakage rate and grain loss.

[0037] In addition, during each layer of feeding, the controller first controls the drive platform 1 to drive the grain distributor 2 to rise and fall, so that the position of the far-mouth grain distributor 22 is aligned with the position of the discharge port 101 of that layer. It then determines whether the grain pile height detected by the far-mouth material level detection element 5 has reached the preset height value. If it has reached the preset height value, the controller then controls the drive platform 1 to drive the grain distributor 2 to move upward, so that the position of the middle-mouth grain distributor 21 is aligned with the position of the discharge port 101 of that layer. It then determines whether the grain pile height detected by the middle-mouth material level detection element 4 has reached the preset height value. If it has reached the preset height value, the controller then controls the drive platform 1 to drive the grain distributor 2 to move upward, so that the far-mouth grain distributor 22 is aligned with the discharge port 101 of the previous layer. During the upward movement of the grain distributor 2, the grain falls from the discharge port 101 of that layer. It is understood that by feeding material sequentially from the outermost grain distribution trough 22, the middle grain distribution trough 21, and the central discharge outlet 101 during each layer of feeding, the grain pile within the silo is evenly distributed, significantly reducing the amount of leveling work. It is also understood that the preset height values ​​corresponding to the grain pile height are different for different layers of feeding. As the number of feeding layers increases, the preset height values ​​also increase accordingly. Specific preset values ​​can be set according to actual needs. Furthermore, during feeding at the same layer, the preset height values ​​corresponding to the middle material level detection element 4 and the outermost material level detection element 5 can be the same or different. Additionally, in other embodiments of the present invention, a method of first feeding material in the middle area, then in the outermost area, and finally in the center can also be adopted.

[0038] In addition, when the ranging element 3 detects that the lifting position of the grain distributor 2 is aligned with the position of the discharge port 101 of the highest layer, and when both the middle-level material level detection element 4 and the far-level material level detection element 5 detect that the grain pile height has reached the preset height value, the controller determines that the silo is full and controls the feeding to stop, thereby realizing the automated control of flexible grain entry into the silo.

[0039] Optionally, the gate at each discharge port 101 on the central column 100 is driven by a dual-stroke drive element. A first material detection element 8 is provided above the highest discharge port 101 on the central column 100, and a second material detection element 9 is provided below the highest discharge port 101. Both the first and second material detection elements 8 and 9 are electrically connected to the controller. When the second material detection element 9 does not detect material, it means that the grain inflow rate is less than the outflow rate, and the grain in the central column 100 is below the discharge position. In this case, the controller controls the dual-stroke drive element to retract to close the gate, allowing the grain to accumulate in the central column 100. When the second material detection element 9 detects material and the first material detection element 8 does not detect material, it means that the grain inflow rate is slightly greater than the outflow rate, and the grain in the central column 100 is above the discharge position. In this case, the controller controls the dual-stroke drive element to extend to the first stroke to partially open the gate, allowing the central column 100 to... The accumulated grain inside the container begins to be evenly distributed by the grain distributor 2. When the first material detection element 8 detects material, it means that the grain inflow rate is greater than the outflow rate, and the grain in the central column 100 is higher than the upper feeding position. The controller then controls the dual-stroke drive element to extend to the second stroke, driving the gate to fully open and increasing the discharge flow rate. This process is repeated continuously, maintaining the grain height in the central column 100 between the lower and upper feeding positions. This ensures that there is sufficient grain in the central column 100 to meet the even distribution requirements of the grain distributor 2 during each layer of distribution, and it can automatically adapt to changes in the grain inflow rate. The dual-stroke drive element is a pneumatic cylinder, hydraulic cylinder, or electric cylinder, preferably a pneumatic cylinder. The first material detection element 8 and the second material detection element 9 are preferably rotary paddle level sensors. Furthermore, when the dual-stroke drive element extends to the first stroke, the gate opening is 3 / 4, therefore, the gate of each discharge port 101 can switch between fully closed, 3 / 4 open, and fully open states.

[0040] It is understood that the present invention detects materials by setting a first material detection element 8 above the discharge port 101 of the highest layer and a second material detection element 9 below the discharge port 101 of the highest layer, and controls the stroke change of the dual-stroke drive element according to the material detection results to control the opening of the gate, so as to ensure that there is enough grain in the central column 100 to meet the balanced distribution requirements of the grain distributor 2 when distributing materials in each layer, and can automatically adapt to changes in the grain inflow rate.

[0041] In addition, each discharge port 101 on the central column 100 is equipped with an air jet nozzle. The controller is also used to control the air jet nozzle to spray airflow when the gate of each discharge port 101 is opened, so as to break up grain bridging at the discharge port 101. It can be understood that by setting air jet nozzles at the discharge port 101 and controlling them in conjunction with the gate, the present invention can prevent grain bridging and blockage at the discharge port 101, thereby improving the grain discharge speed.

[0042] It is understood that, in one embodiment of the present invention, the working process of the flexible grain storage control system is as follows:

[0043] The real-time lifting position Hp1 of the grain distributor 2 is detected by the ranging element 3, and the height of the grain pile at the grain drop point of the distant grain distribution trough 22 is detected by the distant material level detection element 5. If Hp1 = Hp1 min If the grain distributor 2 is at its highest point and the grain pile height detected by the remote material level detection element 5 reaches the preset height value, then the silo is determined to be full and feeding is stopped; if Hp1 = Hp1 min However, if the grain pile height detected by the remote material level detection element 5 does not reach the preset height value, feeding is allowed; if Hp1 min <Hp1<Hp1 max That is, when the grain distributor 2 is between the lowest and highest points, feeding is allowed; if the grain pile height detected by the remote material level detection element 5 is zero, the silo is determined to be empty, and the controller controls the drive platform 1 to drive the grain distributor 2 to descend. When the remote grain distribution trough 22 is aligned with the discharge port 101 of the lowest layer, feeding begins.

[0044] When feeding begins in an empty silo, i.e., when the grain pile height detected by the remote material level detection element 5 is zero, after the remote grain distribution trough 22 is aligned with the lowest discharge port 101 and feeding begins, if the second material detection element 9 does not detect any material, it means that the grain inflow rate is less than the discharge rate, and the grain level in the central column 100 is lower than the bottom level. In this case, the controller controls the double-stroke drive element to retract, drives the gate to close, and stops grain discharge. If the second material detection element 9 detects material and the first material detection element 8 does not detect material, it means that the grain inflow rate is slightly greater than the discharge rate, and the grain level in the central column 100 has reached the bottom level but not the top level. When the material level is reached, the controller controls the dual-stroke drive element to extend to the first stroke, driving the gate to open 3 / 4 and opening the jet nozzle at the lowest discharge port 101 to break up grain bridging. After a delay, the blowing stops, and the grain is evenly distributed through the distant grain distribution trough 22. When the first material detection element 8 detects material, it means that the grain inflow rate is greater than the outflow rate, and the grain level in the central column 100 reaches the upper material level. Then, the controller controls the dual-stroke drive element to extend to the second stroke, driving the gate to open fully and increasing the outflow rate. This keeps the grain level in the central column 100 between the lower and upper material levels, allowing it to adapt to changes in the inflow rate.

[0045] When the grain is evenly distributed to the periphery of the silo through the distal grain distribution trough 22, the height of the grain pile at the grain drop point of the distal grain distribution trough 22 is detected by the distal grain level detection element 5. If the height of the grain pile increases, it can be determined that the gate is open normally. When the height of the grain pile exceeds the preset height value, the controller controls the grain distributor 2 to rise, so that the middle grain distribution trough 21 is aligned with the lowest layer discharge port 101. The grain is evenly distributed to the middle area of ​​the silo through the middle grain distribution trough 21, and the height of the grain pile at the grain drop point of the middle grain distribution trough 21 is detected by the middle grain level detection element 4. At the same time, the opening degree of the gate is controlled according to the dual-stroke drive element control logic mentioned above.

[0046] When the height of the grain pile at the grain drop point of the central grain distribution trough 21 reaches the preset height value, the controller controls the grain distributor 2 to continue to rise. During the rising process, the grain falls through the lowest layer discharge port 101 to the central area of ​​the silo and accumulates continuously. Before the grain blocks the lowest layer discharge port 101, the grain distributor 2 should rise to the upper layer discharge port 101 and make the far-end grain distribution trough 22 aligned with the upper layer discharge port 101.

[0047] The above process is repeated continuously. When the grain distributor 2 moves to the highest discharge port 101, if the first material detection element 8 detects material, and the middle-mouth material level detection element 4 and the far-mouth material level detection element 5 both detect that the grain pile height has reached the preset height value, the controller determines that the silo is full and controls the grain distributor 2 to move to the highest point, i.e., Hp1 = Hp1. minThe feeding process is stopped, and after the dust settles inside the silo, manual labor is arranged to enter the silo and level the grain pile. Alternatively, if the silo is not full after the top discharge port 101 has finished feeding, manual labor is arranged to enter the silo and level the grain pile after the dust settles inside the silo, making room for re-feeding, until the silo is full.

[0048] Optionally, during the lifting and lowering process of the grain distributor 2, the controller is also used to calculate the lower edge height values ​​of the middle grain distribution trough 21 and the far grain distribution trough 22 based on the detection results of the ranging element 3, and control the drive platform 1 to adjust the lifting and lowering speed of the grain distributor 2 based on the calculated lower edge height values, so as to ensure that the middle grain distribution trough 21 or the far grain distribution trough 22 is aligned with the discharge port 101.

[0049] It is understandable that, when the silo is empty, the ground clearance Hpd of the lower edge of the drive platform 1 can be measured using a laser rangefinder. Since the discharge ports 101 on the central column 100 are equidistant from each other with a equidistant height of Hc, the distance from the lower edge of the discharge port 101 of the highest layer (assuming it is the fifth layer) to the lower edge of the drive platform 1 is measured as K5 using a laser rangefinder. Therefore, the distance from the lower edge of the nth layer discharge port 101 to the lower edge of the drive platform 1 is: K i =K5+(5-n)Hc,i=1,2,3,4. Therefore, the distance from the lower edge of each discharge port 101 on the central column 100 to the bottom of the silo can be calculated as: H i =Hpd-K i The grain distributor 2 moves up and down along the outer wall of the central column 100. The lifting position of the grain distributor 2 can be measured in real time by the distance measuring element 3. The distance measuring element 3 measures the distance Hp1 from the lower edge of the drive platform 1 to the fixing point of the pull rope on the grain distributor 2. The dimensions of the openings (i.e., the openings that connect with the discharge port 101) of the distal grain distribution trough 22 and the middle grain distribution trough 21 are known. Assuming the vertical distance between the lower edge of the opening of the middle material level detection element 4 and the distal material level detection element 5 and the fixing point of the pull rope is... Let the distances be y and z respectively. The distance from the lower edge of the far-mouth grain trough 22 to the lower edge of the drive platform 1 is: By0 = Hp1 + y, and the height from the lower edge of the far-mouth grain trough 22 to the bottom of the silo is: By1 = Hpd - (Hp1 + y). The distance from the lower edge of the middle-mouth grain trough 21 to the lower edge of the drive platform 1 is: Bz0 = Hp1 + z, and the height from the lower edge of the middle-mouth grain trough 21 to the bottom of the silo is: Bz1 = Hpd - (Hp1 + z). Since Hpd, y, and z are fixed values ​​and known, while Hp1 can be measured in real time by the distance measuring element 3, By1 and Bz1 can be measured in real time. During the process of controlling the lifting and lowering of the grain distributor 2, when By1 = Hpd... iWhen the far-mouth grain trough 22 is aligned with the discharge port 101 of the i-th layer, the grain is evenly distributed through the far-mouth grain trough 22; when Bz1 = H i When the grain distribution trough 21 is aligned with the discharge port 101 of the i-th layer, the grain is evenly distributed through the grain distribution trough 21. Therefore, by detecting the lifting position of the grain distributor 2 in real time through the ranging element 3, the grain distribution trough 22 at the far end or the grain distribution trough 21 at the middle end of the grain distributor 2 can be aligned with the discharge ports 101 of different layers to achieve uniform distribution.

[0050] In order to ensure that the distant grain distribution trough 22 or the middle grain distribution trough 21 can be quickly and accurately aligned with the discharge port 101, the present invention also controls the driving platform 1 to adjust the lifting speed of the grain distributor 2 according to the lower edge height value of the middle grain distribution trough 21 or the distant grain distribution trough 22.

[0051] During the descent of the grain distributor 2, if the lower edge height of the middle grain trough 21 or the distal grain trough 22 is greater than or equal to a first preset height value, the controller controls the drive platform 1 to drive the grain distributor 2 to move rapidly downward. If the lower edge height of the middle grain trough 21 or the distal grain trough 22 is less than the first preset height value, the controller controls the drive platform 1 to reduce the downward speed of the grain distributor 2. If the lower edge height of the middle grain trough 21 or the distal grain trough 22 is greater than a second preset height value, the controller controls the drive platform 1 to further reduce the downward speed of the grain distributor 2. If the lower edge height of the middle grain trough 21 or the distal grain trough 22 is greater than or equal to a third preset height value and less than or equal to a second preset height value, the controller controls the drive platform 1 to stop driving the grain distributor 2 to rise and fall.

[0052] During the upward movement of the grain distributor 2, if the lower edge height of the middle grain trough 21 or the distal grain trough 22 is less than a fourth preset height value, the controller controls the drive platform 1 to drive the grain distributor 2 to move upward rapidly. If the lower edge height of the middle grain trough 21 or the distal grain trough 22 is greater than or equal to the fourth preset height value, the controller controls the drive platform 1 to reduce the upward movement speed of the grain distributor 2. If the lower edge height of the middle grain trough 21 or the distal grain trough 22 is less than a third preset height value, the controller controls the drive platform 1 to further reduce the upward movement speed of the grain distributor 2. If the lower edge height of the middle grain trough 21 or the distal grain trough 22 is greater than or equal to the third preset height value and less than or equal to the second preset height value, the controller controls the drive platform 1 to stop driving the grain distributor 2 to rise and fall.

[0053] Specifically, the calculated height H of the lower edge of each discharge port 101 above the ground is [value missing]. iSet the error value 'a' for aligning the discharge port 101 and the critical value 'b' for switching the speed during the lifting and lowering process of the grain distributor 2, where b > a, that is, the lower edge height of the middle grain trough 21 or the far grain trough 22 is within [H]. i -a, H i Within the range of +a], it can be aligned with the discharge port 101. During the rising process of the grain distributor 2, if the lower edge height value of the middle grain distribution trough 21 or the far grain distribution trough 22 reaches H i -b, then the rising speed of the grain distributor 2 needs to be reduced. During the descent of the grain distributor 2, if the lower edge height of the middle grain trough 21 or the distal grain trough 22 reaches H... i If +b, then the descent speed of the grain distributor 2 needs to be reduced.

[0054] For example, during the descent of the grain distributor 2, if the lower edge height of the middle grain trough 21 or the distal grain trough 22 is greater than or equal to the first preset height value H... i +b, then the controller controls the drive platform 1 to drive the grain distributor 2 to move down quickly; if the lower edge height of the middle grain trough 21 or the far grain trough 22 is less than the first preset height value H i +b, then the controller controls the drive platform 1 to reduce the downward movement speed of the grain distributor 2; if the lower edge height of the middle grain trough 21 or the far grain trough 22 is greater than the second preset height value H i +a, then the controller controls the drive platform 1 to further reduce the downward movement speed of the grain distributor 2; if the lower edge height of the middle grain trough 21 or the far grain trough 22 is greater than or equal to the third preset height value H i -a and less than or equal to the second preset height value H i When +a, the controller controls the drive platform 1 to stop driving the grain distributor 2 to rise and fall, so that the opening of the middle grain distributor 21 or the far grain distributor 22 is aligned with the discharge port 101 of the i-th layer.

[0055] Similarly, during the rising process of the grain distributor 2, if the lower edge height of the middle grain trough 21 or the far grain trough 22 is less than the fourth preset height value H... i -b, then the controller controls the drive platform 1 to drive the grain distributor 2 to move upward quickly; if the lower edge height of the middle grain distributor trough 21 or the far grain distributor trough 22 is greater than or equal to the fourth preset height value H i -b, then the controller controls the drive platform 1 to reduce the upward movement speed of the grain distributor 2; if the lower edge height of the middle grain trough 21 or the far grain trough 22 is less than the third preset height value H i -a, then the controller controls the drive platform 1 to further reduce the upward movement speed of the grain distributor 2; if the lower edge height of the middle grain trough 21 or the far grain trough 22 is greater than or equal to the third preset height value H i -a and less than or equal to the second preset height value H iWhen +a, the controller controls the drive platform 1 to stop driving the grain distributor 2 to rise and fall, so that the opening of the middle grain distributor 21 or the far grain distributor 22 is aligned with the discharge port 101 of the i-th layer.

[0056] It is understood that the present invention calculates the lower edge height values ​​of the middle grain distribution trough 21 and the far grain distribution trough 22 based on the detection results of the ranging element 3, and controls the driving platform 1 to adjust the lifting speed of the grain distributor 2 based on the calculated lower edge height values. This can ensure that the middle grain distribution trough 21 or the far grain distribution trough 22 is aligned with the discharge port 101, thereby improving the docking control accuracy between the grain distribution trough and the discharge port 101.

[0057] In addition, a limit switch 11 is provided at the bottom of the drive platform 1. The limit switch 11 is electrically connected to the controller. The controller is also used to issue an alarm reminder and / or control the drive platform 1 to drive the grain distributor 2 to descend when the grain distributor 2 rises and triggers the limit switch 11. When the grain distributor 2 moves to the highest point and continues to rise, the grain distributor 2 will trigger the limit switch 11. The controller can then issue an alarm reminder and control the drive platform 1 to drive the grain distributor 2 to descend, preventing the grain distributor 2 from hitting the drive platform 1 and causing an accident. Optionally, a mechanical valve can be added to the drive platform 1. The mechanical valve is a roller lever type and is fixed to the lower end face of the drive platform 1. A stop plate is installed on the upper surface of the grain distributor 2. When the grain distributor 2 continues to rise after triggering the limit switch 11, the stop plate will automatically push against the roller of the mechanical valve, thereby automatically cutting off the rising air path, prohibiting further rising, and switching to descending operation at any time. When the grain distributor 2 descends, the mechanical valve automatically returns to its original state.

[0058] In addition, such as Figure 3 As shown, this invention also constructs a grain depot storage local area network based on a single flexible grain storage control system, sets IP addresses for each grain warehouse in the grain depot group, and forms an intranet within the grain depot storage area through Ethernet gateways and switches. Combined with pre-cleaning equipment, lifting and conveying equipment, and corresponding grain warehouse ventilation and dust removal equipment, a comprehensive grain depot storage center control system is constructed.

[0059] like Figure 4 As shown, another embodiment of the present invention also provides a flexible grain storage control method, preferably employing the flexible grain storage control system described above, comprising the following:

[0060] Step S1: Detect the lifting position of the grain distributor and determine whether the grain distributor is aligned with the discharge port of the target layer;

[0061] Step S2: After the grain distributor is aligned with the discharge port of the target layer, the height of the grain pile at the grain drop point of the middle and far grain distribution troughs of the grain distributor is detected, and the grain distributor is raised and lowered according to the two grain pile height detection results, so that the grain is fed evenly from the outside of the silo to the center of the silo when it enters the target layer.

[0062] Step S3: After controlling the grain distributor to rise and align with the discharge port of the upper layer, repeat the above process so that the grain is fed into the warehouse layer by layer from bottom to top.

[0063] It is understood that the flexible grain feeding control method of this embodiment determines whether the grain feeder is aligned with the discharge port of the target layer by detecting the lifting position of the grain feeder. When the grain feeder is aligned with the discharge port of the target layer, the height of the grain pile at the grain drop point of the upper and lower grain feed troughs and the lower grain feed trough of the grain feeder is detected. Based on the detection results of the two grain pile heights, the grain feeder is raised and lowered, so that the grain is fed evenly from the outside of the silo to the center of the silo when it enters the target layer. Then, the grain feeder is raised and aligned with the discharge port of the next layer, and the above process is repeated, so that the grain is fed into the silo layer by layer from bottom to top. The flexible grain feeding control method of this invention adopts the method of feeding from bottom to top layer by layer, which reduces the grain drop height, thereby reducing the grain breakage rate and grain loss. Moreover, the feeding of each layer adopts the method of feeding evenly from the outside of the silo to the center of the silo, which achieves uniform feeding of each layer, making the grain pile distribution in the silo uniform, greatly reducing the amount of leveling work, thereby realizing flexible grain feeding.

[0064] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0065] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

[0066] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A flexible grain storage control system, characterized in that, The system includes a drive platform (1), a grain distributor (2), a distance measuring element (3), a middle-mouth material level detection element (4), a far-mouth material level detection element (5), and a controller. The drive platform (1) is fixedly installed on the top of the silo and driven to connect with the grain distributor (2) to drive the grain distributor (2) to rise and fall. The distance measuring element (3) is installed on the drive platform (1) to detect the rising and falling position of the grain distributor (2). The drive platform (1) is equipped with an outwardly extending first mounting plate (6) and a second mounting plate (7), which are staggered circumferentially. The middle-mouth material level detection element (4) is installed on the first mounting plate (6) to detect the middle-mouth material level of the grain distributor (2). The height of the grain pile at the grain drop point of the grain distribution trough (21) is determined by the distance level detection element (5) installed on the second mounting plate (7). The controller is electrically connected to the drive platform (1), the distance measuring element (3), the middle level detection element (4), and the distance level detection element (5). The controller is used to issue control commands to the drive platform (1) based on the detection results of the distance measuring element (3), the middle level detection element (4), and the distance level detection element (5) to drive the grain distribution device (2) to adjust the lifting position so that the grain is fed into the silo layer by layer from bottom to top and each layer is fed evenly from the outer periphery of the silo to the center of the silo. Each gate at each discharge port (101) on the central column (100) is driven by a dual-stroke drive element. A first material detection element (8) is installed above the highest discharge port (101) on the central column (100), and a second material detection element (9) is installed below the highest discharge port (101). Both the first material detection element (8) and the second material detection element (9) are electrically connected to the controller. When the second material detection element (9) does not detect material, it means that the grain inflow rate is less than the outflow rate, and the grain in the central column (100) is below the discharge position. The controller controls the dual-stroke drive element to retract to close the gate, so that the grain accumulates in the central column (100). When the second material detection element (9) detects material and the first material detection element (8) does not detect material, it means that the grain inflow rate is less than the outflow rate, and the grain in the central column (100) is below the discharge position. The controller controls the dual-stroke drive element to retract to close the gate, so that the grain accumulates in the central column (100). When the inflow rate is slightly greater than the outflow rate and the grain in the central column (100) is higher than the unloading position, the controller controls the dual-stroke drive element to extend to the first stroke to drive the gate to partially open. The grain accumulated in the central column (100) begins to fall evenly through the grain distributor (2). When the first material detection element (8) detects the material, it means that the inflow rate of the grain is greater than the outflow rate and the grain in the central column (100) is higher than the loading position. The controller controls the dual-stroke drive element to extend to the second stroke to drive the gate to fully open, thereby increasing the outflow rate. The above process is repeated continuously to keep the grain height in the central column (100) between the unloading position and the loading position, ensuring that there is enough grain in the central column (100) to meet the balanced loading requirements of the grain distributor (2) during each layer of material distribution, and can automatically adapt to changes in the grain inflow rate. During the lifting and lowering process of the grain distributor (2), the controller is also used to calculate the lower edge height values ​​of the middle grain trough (21) and the far grain trough (22) based on the detection results of the distance measuring element (3), and control the drive platform (1) to adjust the lifting and lowering speed of the grain distributor (2) based on the calculated lower edge height values, so as to ensure that the middle grain trough (21) or the far grain trough (22) is aligned with the discharge port (101); During the descent of the grain distributor (2), if the lower edge height of the middle grain trough (21) or the far grain trough (22) is greater than or equal to the first preset height value, the controller controls the drive platform (1) to drive the grain distributor (2) to move down quickly. If the lower edge height of the middle grain trough (21) or the far grain trough (22) is less than the first preset height value, the controller controls the drive platform (1) to reduce the downward speed of the grain distributor (2). If the lower edge height of the middle grain trough (21) or the far grain trough (22) is greater than the second preset height value, the controller controls the drive platform (1) to further reduce the downward speed of the grain distributor (2). If the lower edge height of the middle grain trough (21) or the far grain trough (22) is greater than or equal to the third preset height value and less than or equal to the second preset height value, the controller controls the drive platform (1) to stop driving the grain distributor (2) to rise and fall. During the upward movement of the grain distributor (2), if the lower edge height of the middle grain trough (21) or the far grain trough (22) is less than the fourth preset height value, the controller controls the drive platform (1) to drive the grain distributor (2) to move upward quickly. If the lower edge height of the middle grain trough (21) or the far grain trough (22) is greater than or equal to the fourth preset height value, the controller controls the drive platform (1) to reduce the upward movement speed of the grain distributor (2). If the lower edge height of the middle grain trough (21) or the far grain trough (22) is less than the third preset height value, the controller controls the drive platform (1) to further reduce the upward movement speed of the grain distributor (2). If the lower edge height of the middle grain trough (21) or the far grain trough (22) is greater than or equal to the third preset height value and less than or equal to the second preset height value, the controller controls the drive platform (1) to stop driving the grain distributor (2) to move up and down.

2. The flexible grain storage control system as described in claim 1, characterized in that, During the process of feeding material layer by layer from bottom to top, the controller first controls the drive platform (1) to drive the grain distributor (2) to descend, and detects the descending position of the grain distributor (2) through the ranging element (3) to determine whether the grain distributor (2) is aligned with the position of the lowest layer discharge port (101) on the central column (100). After the uniform feeding of the lowest layer is completed, the controller then controls the drive platform (1) to drive the grain distributor (2) to rise to align with the discharge port (101) of the previous layer. The above process is repeated until the grain distributor (2) rises to the position of the highest layer discharge port (101).

3. The flexible grain storage control system as described in claim 2, characterized in that, During each layer of feeding, the controller first controls the drive platform (1) to drive the grain distributor (2) to rise and fall, so that the position of the far-mouth grain distributor (22) is aligned with the position of the discharge port (101) of the layer. It then determines whether the height of the grain pile detected by the far-mouth material level detection element (5) has reached the preset height value. If the preset height value is reached, the controller then controls the drive platform (1) to drive the grain distributor (2) to move upward, so that the position of the middle-mouth grain distributor (21) is aligned with the position of the discharge port (101) of the layer. It then determines whether the height of the grain pile detected by the middle-mouth material level detection element (4) has reached the preset height value. If the preset height value is reached, the controller then controls the drive platform (1) to drive the grain distributor (2) to move upward, so that the position of the far-mouth grain distributor (22) is aligned with the discharge port (101) of the previous layer. During the upward movement of the grain distributor (2), the grain falls from the discharge port (101) of the layer.

4. The flexible grain storage control system as described in claim 3, characterized in that, When the ranging element (3) detects that the lifting position of the grain distributor (2) is aligned with the position of the discharge port (101) of the highest layer, and both the middle-level material level detection element (4) and the far-level material level detection element (5) detect that the height of the grain pile has reached the preset height value, the controller determines that the silo is full and controls the feeding to stop.

5. The flexible grain storage control system as described in claim 1, characterized in that, A jet nozzle is provided at each discharge port (101) on the central column (100), and the controller is also used to control the jet nozzle to spray airflow when the gate of each discharge port (101) is opened, so as to break the grain arching at the discharge port (101).

6. The flexible grain storage control system as described in claim 1, characterized in that, The bottom of the drive platform (1) is also provided with a limit switch (11), which is electrically connected to the controller. The controller is also used to issue an alarm reminder and / or control the drive platform (1) to drive the grain distributor (2) to descend when the grain distributor (2) rises and triggers the limit switch (11).

7. A method for flexible grain storage control, employing the flexible grain storage control system as described in any one of claims 1 to 6, characterized in that, Includes the following: Detect the lifting position of the grain distributor and determine whether the grain distributor is aligned with the discharge port of the target layer; After the grain distributor is aligned with the discharge port of the target layer, the height of the grain pile at the grain drop point of the middle and far grain troughs of the grain distributor is detected, and the grain distributor is raised and lowered according to the two grain pile height detection results, so that the grain is fed evenly from the outside of the silo to the center of the silo when it enters the target layer. After controlling the grain distributor to rise and align with the discharge port of the upper layer, repeat the above process so that the grain is fed into the warehouse layer by layer from bottom to top.

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