Coal detection in a coal bunker and method

Abstract

The present application relates to the technical field of coal bunker, especially to a coal breakage detection coal bunker and method, which comprises a coal storage assembly, a coal storage bin, a sealing plate for sealing the outlet of the coal storage bin, a hydraulic pump for driving the sealing plate to rotate and open, and an electrical box fixedly installed on the side wall of the coal storage bin, a coal breakage detection assembly, a rotating connection seat rotatably installed on the sealing plate, a plug-in cavity opened at one end of the rotating connection seat, a pressure sensor and a return spring arranged in the plug-in cavity, and an anti-edge falling device arranged at the opening of the plug-in cavity, wherein the pressure sensor collects the force of the falling coal, judges the data change, and determines whether the coal storage bin outlet is blocked, thereby solving the problem of waste of manpower and poor monitoring effect of the visual sensing monitor in monitoring whether the coal bunker is broken.

Description

Technical Field

[0001] This invention relates to the field of coal bunker technology, and in particular to a coal bunker and method for detecting coal shortage. Background Technology

[0002] Coal-fired power plants typically require multiple coal bunkers to store coal, ensuring a continuous supply during boiler combustion. The bunkers generally have a storage chamber at the top and a conical shape at the bottom for discharging. Therefore, the bunker outlets are usually not very large, resulting in a slow coal discharge rate. Furthermore, because power plants use a single type of coal with high moisture content, coal blockages and interruptions frequently occur at the bunker outlets, especially during winter when temperatures are low. These blockages can cause interruptions in the coal feeder's supply, posing a significant risk to the stable operation of the unit. Therefore, it is common practice to install coal storage bins near the bunker outlets. Recently, equipment for detecting coal shortages, such as visual sensor monitors, has been installed. These monitors use technologies like cameras or infrared to monitor the coal bunker outlet area in real time and perform image recognition and analysis. However, because coal dust flies around when the coal bunker is discharging, the monitoring probes are easily obscured, leading to errors in the monitoring and analysis results. Furthermore, to ensure the equipment operates normally, staff need to clean it regularly, making this type of coal bunker detection equipment quite labor-intensive. To address this problem, we propose a method for detecting coal shortages in a coal bunker. Summary of the Invention

[0003] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0004] In view of the problems of wasting manpower and poor monitoring effect in the above-mentioned or existing technologies of using visual sensor monitors to monitor whether the coal bunker is out of coal, the present invention is proposed.

[0005] Therefore, the purpose of this invention is to provide a coal bunker for detecting coal shortage.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a coal shortage detection coal bunker, comprising a coal storage assembly, which includes a coal storage bunker, a sealing plate for sealing the outlet of the coal storage bunker, a hydraulic pump for driving the sealing plate to rotate and open, and an electrical box fixedly installed on the side wall of the coal storage bunker; the coal shortage detection assembly includes a rotating connecting seat rotatably installed on the sealing plate, a plug-in cavity opened at one end of the rotating connecting seat, a pressure sensor and a reset spring disposed in the plug-in cavity, and an anti-detachment edge disposed at the opening of the plug-in cavity.

[0007] As a preferred embodiment of the coal bunker for coal shortage detection in this invention, wherein: one end of the hydraulic pump telescopic column is provided with a movable column, and the movable column and the annular hole for anti-detachment edge are movably inserted and matched, the diameter of the movable column is smaller than the diameter of the hydraulic pump telescopic column, and the length of the movable column is smaller than the active depth of the insertion cavity after the pressure sensor is installed.

[0008] As a preferred embodiment of the coal bunker for detecting coal shortage in this invention, the movable column is provided with an anti-detachment block at the end away from the hydraulic pump telescopic column, and the outer diameter of the anti-detachment block is the same as the inner diameter of the insertion cavity. The hydraulic pump is movably connected to the rotating connecting seat through the matching of the anti-detachment block and the anti-detachment edge.

[0009] In a preferred embodiment of the coal bunker for detecting coal shortage of the present invention, a first conductive ring is sleeved on the outer wall of the rotating connecting seat, and elastic arc plates are arranged in annular array on the circumferential side wall of the first conductive ring, and the first conductive ring is electrically connected to the pressure sensor.

[0010] As a preferred embodiment of the coal bunker for coal shortage detection in this invention, the hydraulic pump has a fixed sleeve welded to one end of its hydraulic cylinder, and a second wire ring is provided on the inner wall of the fixed sleeve, the second wire ring being electrically connected to the electrical box.

[0011] In a preferred embodiment of the coal bunker for detecting coal shortage of the present invention, the inner diameter of the fixed sleeve is the same as the outer diameter of the rotating connecting seat, and the fixed sleeve and the rotating connecting seat are movably connected.

[0012] In a preferred embodiment of the coal bunker for detecting coal shortage according to the present invention, the electrical box is electrically connected to the hydraulic pump, and an alarm light is provided on the electrical box.

[0013] A coal shortage detection method is applied to a coal storage bin. A wireless remote control operates an electrical box to control a hydraulic pump that drives a sealing plate to rotate, opening the bin's outlet to unload coal. The coal falls under gravity and hits the sealing plate, causing it to rotate and push a rotating connecting seat towards the hydraulic pump. A pressure sensor receives the pressure between the rotating connecting seat and the hydraulic pump and transmits the pressure change value to the electrical box for analysis. When the pressure sensor reading is consistently changing, the coal bin is in a normal unloading state and no alarm is triggered. When the pressure sensor reading is fixed, the coal bin is blocked, and an alarm light illuminates to alert personnel.

[0014] In a preferred embodiment of the coal shortage detection method of the present invention, the sealing plate is set at a 45-degree angle to the coal storage bin outlet after it is opened.

[0015] In a preferred embodiment of the coal shortage detection method of the present invention, the fixed pressure value received by the pressure sensor is the value of the sealing plate being pressed down by its own gravity.

[0016] The beneficial effects of the coal blockage detection method of the present invention are as follows: In the present invention, when the sealing plate is opened for unloading, the pressure value of the coal falling and hitting the sealing plate is collected by the pressure sensor to analyze whether there is a coal blockage. If the pressure value is higher than the pressure under the weight of the sealing plate and fluctuates, it means that the coal storage bin is unloading normally. When the pressure sensor value becomes the pressure under the weight of the sealing plate and remains unchanged or fluctuates little, it means that there is a coal blockage at the outlet of the coal storage bin. The alarm light is lit by the electrical box to remind nearby staff to handle the situation.

[0017] In addition, after the sealing plate is closed, the pressure sensor is disconnected from the electrical box, reducing the ineffective use of the pressure sensor and thus improving its service life. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall coal bunker for coal shortage detection.

[0020] Figure 2 A schematic diagram of the coal storage components and coal shortage detection components of the coal bunker for coal shortage detection.

[0021] Figure 3 A schematic diagram of the exploded structure of the hydraulic pump and coal shortage detection component in the coal bunker for coal shortage detection.

[0022] Figure 4 This is a schematic diagram showing the connection between the hydraulic pump and the coal shortage detection component when the sealing plate in the coal bunker is opened for coal shortage detection.

[0023] Figure 5 This is a schematic diagram showing the connection structure between the hydraulic pump and the coal shortage detection component when the sealing plate is closed in the coal shortage detection method. Detailed Implementation

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0027] Example 1, referring to Figures 1 to 5 This is the first embodiment of the present invention. This embodiment provides a coal bunker for detecting coal shortage, which solves the problem that using visual sensor monitors to monitor whether the coal bunker is out of coal is wasteful of manpower and has poor monitoring effect. It includes a coal storage component 100, which includes a coal storage bunker 101, a sealing plate 102 for sealing the outlet of the coal storage bunker 101, a hydraulic pump 103 for driving the sealing plate 102 to rotate and open, and an electrical box 104 fixedly installed on the side wall of the coal storage bunker 101. The coal shortage detection component 200 includes a rotating connecting seat 201 rotatably installed on the sealing plate 102, a plug-in cavity 201a opened at one end of the rotating connecting seat 201, a pressure sensor 202 and a return spring 203 disposed in the plug-in cavity 201a, and an anti-detachment edge 201b disposed at the opening of the plug-in cavity 201a.

[0028] In this embodiment, as Figure 2 The sealing plate 102 is welded from two plates with an included angle of 135 degrees. The two plates are named Plate A and Plate B respectively. Plate A is used to seal the outlet of the coal storage bin 101. A rotating lug is provided on the side of Plate A near the included angle. A matching rotating lug is welded to the side wall of the outlet of the coal storage bin 101. The two rotating lugs are rotatably connected by a rotating shaft, so that the sealing plate 102 and the coal storage bin 101 are rotatably connected together. The opening and closing of the outlet of the coal storage bin 101 can be realized by rotating the sealing plate 102. A rotating seat is provided in the middle of the end of Plate B away from Plate A. Plate B is rotatably connected by the rotating seat and the rotating lug on the rotating connecting seat 201. A reinforcing rib is welded at the included angle of Plate A and Plate B.

[0029] Furthermore, the telescopic ends of the coal shortage detection component 200 and the hydraulic pump 103 are connected. When the hydraulic pump 103 extends to push the sealing plate 102, it will rotate and close the sealing plate 102. When the hydraulic pump 103 retracts, the sealing plate 102 will rotate and open. When it opens, plate B is in a horizontal state, causing plate A to tilt downwards at a 45-degree angle. At this time, the function of plate A changes from blocking the coal to guiding the coal to flow. It also serves as the force receiving plate for the pressure sensor 202. The coal falls onto plate A due to gravity, causing plate A to drive plate B to rotate, thereby pushing the rotating connecting seat 201 towards the hydraulic pump 103. The pressure sensor 202 inside the rotating connecting seat 201 is subjected to pressure. When the coal is being fed normally, the pressure value received by the pressure sensor 202 is the extrusion force of the tilted A plate plus the gravity of the falling coal. However, since the coal feeding speed may vary, the pressure value received by the pressure sensor 202 is fluctuating, and the pressure value is always greater than the extrusion force of the tilted A plate. When coal blockage occurs, the feeding speed will gradually decrease until it is completely blocked. At this time, the pressure value received by the pressure sensor 202 will gradually decrease until it drops to the extrusion force of the tilted A plate, and its pressure value no longer fluctuates.

[0030] It should be noted that although plate A is tilted downwards during unloading, the coal contains a certain amount of moisture, preventing it from completely sliding off plate A. How then does electrical box 104 analyze the data? Actually, electrical box 104's analysis of the pressure values ​​received by pressure sensor 202 is not limited to individual data points. Its analysis principle is based on pressure fluctuations. When plate 102 is first opened, it facilitates coal flow, so the pressure fluctuation values ​​received by pressure sensor 202 are normal. However, when coal blockage occurs, the pressure value of pressure sensor 202 will continuously decrease. The final value at which it stops is not particularly important, because as long as the coal is being discharged normally, the pressure value will change.

[0031] One end of the telescopic column of the hydraulic pump 103 is provided with a movable column 103a, and the movable column 103a and the annular hole of the anti-detachment edge 201b are movably inserted and matched. The diameter of the movable column 103a is smaller than the diameter of the telescopic column of the hydraulic pump 103, and the length of the movable column 103a is smaller than the active depth of the insertion cavity 201a after the pressure sensor 202 is installed.

[0032] In this embodiment, when the hydraulic pump 103 is in its extended state, pushing the sealing plate 102 to rotate and block the outlet of the coal storage bin 101, the sealing plate 102 bears a large downward pressure. This downward pressure acts on the rotating connecting seat 201 through rotation, causing the rotating connecting seat 201 and the telescopic column on the hydraulic pump 103 to be in close contact. Figure 5As shown, when the rotating connecting seat 201 and the telescopic column on the hydraulic pump 103 are in close contact, the movable column 103a only squeezes the return spring 203, so that the pressure sensor 202 is only subjected to the rebound force of the return spring 203. If the movable column 103a is not provided and the telescopic column on the hydraulic pump 103 and the annular hole of the anti-detachment edge 201b are directly matched and inserted, then when the sealing plate 102 is closed, the telescopic column on the hydraulic pump 103 will directly abut against the pressure sensor 202, causing the pressure sensor 202 to receive a large pressure, which makes it prone to damage.

[0033] An anti-detachment block 103b is provided at the end of the movable column 103a away from the telescopic column of the hydraulic pump 103. The outer diameter of the anti-detachment block 103b is the same as the inner diameter of the insertion cavity 201a. The hydraulic pump 103 is movably connected to the rotating connecting seat 201 through the matching of the anti-detachment block 103b and the anti-detachment edge 201b.

[0034] In this embodiment, when the sealing plate 102 is in the open state, the hydraulic pump 103 is in the retracted state. The anti-detachment block 103b prevents the movable column 103a from disengaging from the insertion cavity 201a during retraction. Simultaneously, the reset spring 203 is positioned between the pressure sensor 202 and the anti-detachment block 103b, ensuring that after the hydraulic pump 103 retracts, the pressure sensor 202 in the rotating connecting seat 201 is not pushed against the anti-detachment block 103b by the gravity of the sealing plate 102. This allows the sealing plate 102 to still have a rotatable space in the open state, facilitating coal feeding. The sealing plate 102 can rotate, causing it to bounce up and down, which makes it easier for the coal on the sealing plate 102 to slip off. If there is no reset spring 203, the sealing plate 102 will push the pressure sensor 202 in the rotating connecting seat 201 to stick to the anti-detachment block 103b after it is opened. This will cause the pressure sensor 202 to make hard contact with the anti-detachment block 103b when it receives the pressure value, which will easily damage the pressure sensor 202. In addition, coal can easily accumulate on the sealing plate 102 in the moving space, resulting in unstable data.

[0035] Example 2, refer to Figures 1 to 5 This is the second embodiment of the present invention. Unlike the previous embodiment, the outer wall of the rotating connecting seat 201 is fitted with a first conductive ring 204, and the circumferential side wall of the first conductive ring 204 has an elastic arc plate 204a arranged in a ring. The first conductive ring 204 and the pressure sensor 202 are electrically connected.

[0036] A fixed sleeve 103c is welded to one end of the hydraulic cylinder of the hydraulic pump 103, and a second guide ring 103d is provided on the inner wall of the fixed sleeve 103c. The second guide ring 103d is electrically connected to the electrical box 104.

[0037] The inner diameter of the fixed sleeve 103c is the same as the outer diameter of the rotating connecting seat 201, and the fixed sleeve 103c and the rotating connecting seat 201 are movably connected.

[0038] In this embodiment, the first conductive ring 204 is an embedded design, with its annular outer wall flush with the outer wall of the rotating connecting seat 201. The second guide ring 103d is also embedded, nested within the inner wall of the fixed sleeve 103c, with its annular inner wall flush with the inner wall of the fixed sleeve 103c. The second guide ring 103d is electrically connected to the electrical box 104 via a wire. When the hydraulic pump 103 is in the contracted state, as... Figure 4 As shown, the fixed sleeve 103c is sleeved on the outside of the rotating connecting seat 201. The elastic arc plate 204a on the second guide ring 103d and the first guide ring 204 is electrically connected, so that the pressure value collected by the pressure sensor 202 can be transmitted to the electrical box 104 for analysis and judgment. When the sealing plate 102 closes and blocks the outlet of the coal storage bin 101, the hydraulic pump 103 is in the extended state, as shown. Figure 5 As shown, the elastic arc sheet 204a on the second guide ring 103d and the first guide ring 204 separates, causing the pressure sensor 202 to be de-energized, reducing the invalid operation data acquisition of the pressure sensor 202, thereby improving the service life of the pressure sensor 202.

[0039] The electrical box 104 is electrically connected to the hydraulic pump 103, and an alarm light 104a is installed on the electrical box 104.

[0040] In this embodiment, the electrical box 104 is equipped with a wireless connection module, which has a remote control that is wirelessly connected to it. The operator can operate it through the wireless remote control to drive the extension and retraction of the hydraulic pump 103, thereby controlling the opening and closing of the sealing plate 102. At the same time, the electrical box 104 is equipped with a main control module, which is electrically connected to the pressure sensor 202 through wires, a second wire ring 103d, an elastic arc sheet 204a and a first wire ring 204. The main control module analyzes and judges the pressure value collected by the pressure sensor 202. When the analysis result shows coal blockage, the alarm light 104a is activated to prompt the operator to clear the coal.

[0041] The rest of the structure is the same as in Example 1.

[0042] After the hydraulic pump 103 contracts, it drives the sealing plate 102 to rotate and open. At this time, there is a space for movement and expansion between the coal shortage detection component 200 and the hydraulic pump 103 under the action of the return spring 203. After the sealing plate opens, the coal in the coal storage bin 101 falls down and hits the sealing plate 102, causing the sealing plate 102 to rotate and push the rotating connecting seat 201 to squeeze towards the hydraulic pump 103. The squeezing force acts on the pressure sensor 202 through the return spring 203, continuously unloading the coal and causing the pressure sensor 202 to receive different pressure values. Different pressure values ​​indicate that the coal storage bin 101 is unloading normally. When the value of the pressure sensor 202 becomes the pressure under the weight of the sealing plate 102, and the value remains unchanged or fluctuates little, it indicates that there is a coal blockage at the outlet of the coal storage bin 101. The alarm light 104a is lit through the electrical box 104 to remind nearby personnel to handle the situation.

[0043] Example 3, referring to Figures 1 to 5 This is the third embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a coal shortage detection method. A wireless remote control operates the electrical box 104 to control the hydraulic pump 103, which drives the sealing plate 102 to rotate, opening the outlet of the coal storage bin 101 to unload the coal. The coal falls under gravity and hits the sealing plate 102, causing it to rotate and push the rotating connecting seat 201 towards the hydraulic pump 103. The pressure sensor 202 receives the pressure between the rotating connecting seat 201 and the hydraulic pump 103 and transmits the change in pressure value to the electrical box 104 for analysis and judgment. When the pressure value received by the electrical box 104 from the pressure sensor 202 is changing regularly, the coal bin is in a normal unloading state and no alarm is triggered. When the pressure value received by the electrical box 104 from the pressure sensor 202 is a fixed value, the coal bin is in a coal blockage state, and the alarm light 104a is illuminated to alert the staff.

[0044] After the sealing plate 102 is opened, it is set at a 45-degree angle to the outlet of the coal storage bin 101. After the sealing plate 102 is opened, it is tilted downward at a 45-degree angle, so that the coal falling from the coal storage bin 101 can fall down due to gravity after hitting the sealing plate 102, thus preventing the previously fallen coal from accumulating on the sealing plate 102.

[0045] The fixed pressure value received by the pressure sensor 202 is the value of the sealing plate 102 rotating and pressing down due to its own gravity.

[0046] The rest of the structure is the same as in Example 2.

[0047] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0048] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the invention as currently considered, or those features that are not relevant to implementing the invention) may be omitted.

[0049] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0050] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A coal out detection coal bunker, characterised in that: The utility model relates to a coal storage bin, and particularly to a coal storage bin with a coal breakage detection function. The coal storage bin comprises a coal storage bin (100), a sealing plate (102) for sealing the outlet of the coal storage bin (100), a hydraulic pump (103) for driving the sealing plate (102) to rotate and open, and an electrical box (104) fixedly installed on the side wall of the coal storage bin (100); The coal breakage detection assembly (200) comprises a rotating connecting seat (201) rotatably installed on the sealing plate (102), a plug-in cavity (201a) formed in one end of the rotating connecting seat (201), a pressure sensor (202) and a reset spring (203) arranged in the plug-in cavity (201a), and an anti-escape edge (201b) arranged at the opening of the plug-in cavity (201a); One end of the telescopic column of the hydraulic pump (103) is provided with a movable column (103a), and the movable column (103a) and the annular hole of the anti-escape edge (201b) are movably plug-in matched; The diameter of the movable column (103a) is smaller than that of the telescopic column of the hydraulic pump (103), and the length of the movable column (103a) is smaller than the active depth of the plug-in cavity (201a) after the pressure sensor (202) is installed; The end of the movable column (103a) away from the telescopic column of the hydraulic pump (103) is provided with an anti-escape block (103b), and the outer diameter of the anti-escape block (103b) is the same as the inner diameter of the plug-in cavity (201a); The hydraulic pump (103) is movably connected with the rotating connecting seat (201) through the matching of the anti-escape block (103b) and the anti-escape edge (201b).

2. The coal out detection bunker of claim 1, wherein: A first conductive ring (204) is sleeved on the outer wall of the rotating connecting seat (201), and a plurality of elastic arc pieces (204a) are arranged in an annular array on the circumferential side wall of the first conductive ring (204), and the first conductive ring (204) is electrically connected with the pressure sensor (202).

3. A coal-out detection bin as claimed in claim 2 wherein: A fixed sleeve (103c) is welded at one end of the hydraulic cylinder of the hydraulic pump (103), and a second wire ring (103d) is arranged on the inner wall of the fixed sleeve (103c), and the second wire ring (103d) is electrically connected with the electrical box (104).

4. A coal-out detection bin as claimed in claim 3 wherein: The inner diameter of the fixed sleeve (103c) is the same as the outer diameter of the rotating connecting seat (201), and the fixed sleeve (103c) and the rotating connecting seat (201) are movably sleeved.

5. A coal out detection bin as claimed in claim 4 wherein: The electrical box (104) is electrically connected with the hydraulic pump (103), and an alarm lamp (104a) is arranged on the electrical box (104).

6. A coal out detection method characterized by: The coal breakage detection coal bin of any one of claims 1-5, The hydraulic pump (103) is driven by the electrical box (104) to drive the sealing plate (102) to rotate and open the outlet of the coal storage bin (101) through wireless remote control; The coal material falls by gravity and hits the sealing plate (102), so that the sealing plate (102) rotates and drives the rotating connecting seat (201) to press towards the hydraulic pump (103); The pressure sensor (202) receives the pressing force between the rotating connecting seat (201) and the hydraulic pump (103), and transmits the change value of the pressing force to the electrical box (104) for analysis and judgment; When the electrical box (104) receives the pressure value of the pressure sensor (202) in regular change, the coal bunker is in normal unloading state, and no alarm is given; When the electrical box (104) receives the pressure value of the pressure sensor (202) as a fixed value, the coal bunker is in coal blocking state, and the alarm lamp (104a) is lighted to prompt the staff.

7. A coal out detection method as claimed in claim 6, characterised by: The sealing plate (102) is arranged at an angle of 45 degrees with the outlet of the coal storage bunker (101) after being opened.

8. A coal out detection method as claimed in claim 7, characterised by: The fixed value received by the pressure sensor (202) is the value under the self-gravity rotation and pressing of the sealing plate (102).

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