Method for detecting state of face guard of fully-mechanized coal mining face of coal mine

Abstract

The invention discloses a method for detecting the state of a face guard of a fully-mechanized coal mining face, and belongs to the field of infrared imaging processing. The method specifically comprises the steps that an infrared camera is installed on every two hydraulic supports of a fully-mechanized coal mining face of a coal mine, N infrared cameras are installed in total according to the length of the fully-mechanized coal mining face, and the visual field covers the whole fully-mechanized coal mining face; then, a marker is additionally arranged in the middle of the face protecting plate of each hydraulic support, and the material of the marker, the material of the face protecting plate and the coal seam have different emissivity; thirdly, collecting infrared image data of the face guard containing the marker and infrared image data of the face guard not containing the marker, making corresponding labels, and packaging and storing label information into an infrared camera memory; and finally, in the working process, the working states of the roller and the side protection plate are monitored and detected in real time through an infrared camera: whether the side protection plate is folded or not is further confirmed by adding a marker and detecting whether the marker exists or not, the accuracy of the system is improved, and the safety accident risk is reduced.

Description

Technical Field

[0001] The invention belongs to the field of infrared imaging processing, and in particular is a method for detecting the state of a side guard plate of a fully mechanized mining face in a coal mine. Background Art

[0002] Infrared thermal imaging has the advantages of strong penetrating power and high clarity at night. It can not only penetrate smoke, but also form images in environments with poor visibility or lighting. It has been widely used in security, perimeter, military, border and coastal defense and other fields.

[0003] At present, coal mine safety, coal mine intelligence and coal mine digitization have received great attention and development. Due to the advantages of the infrared imaging system itself, it has been vigorously promoted and applied in coal mine intelligence scenarios.

[0004] In the solution of panoramic stitching and presentation of coal mine fully mechanized mining face, many companies and scientific research institutions have proposed intelligent solutions, which can not only present the scene of coal cutting machine mining in real time, but also reduce the working time of coal miners underground, and improve the safety of coal mining work; but at the same time, other safety issues will also arise:

[0005] For example, when the coal cutter was moving, due to smoke, obstructed vision and other reasons, the workers failed to observe in time that the side guard plates were not retracted, resulting in the coal cutter cutting the side guard plates, which not only made the side guard plates and the coal cutter easily damaged, but even caused serious accidents such as roof collapse. Summary of the invention

[0006] Aiming at the problem of dangerous accidents caused by untimely retracting of side guard plates in an intelligent system of a fully mechanized coal mining face, the present invention proposes a method for detecting the status of side guard plates of a fully mechanized coal mining face, thereby improving the safety of a coal cutter during operation.

[0007] The method for detecting the state of the side guard plate of a fully mechanized coal mining face has the following specific steps:

[0008] Step 1: Install an infrared camera on every two hydraulic supports of the fully mechanized mining face of the coal mine. According to the length of the fully mechanized mining face, install a total of N infrared cameras to cover the entire fully mechanized mining face.

[0009] Step 2: Add a marker in the middle of each guard plate. The marker material has a different emissivity from the guard plate material and the coal seam.

[0010] Step 3: Collect infrared image data of the side guard plate with and without the markers, make corresponding labels, and then package and save the label information into the memory of the infrared camera.

[0011] The roller label is G, the guard plate label is H, and the marker label is B in the image, and the grayscale mean within the range of G, H, and B is calculated in real time. And the distance GH between the label G of the coal cutter drum and the label H of the guard plate L , the distance GB between the label G of the coal cutter drum and the label B of the marker L ;

[0012] Step 4: During the working process, the infrared camera is used to monitor and detect the working status of the roller and the side guard in real time:

[0013] When both tag H and tag B are detected at the same time, it means that the guard plate is not lifted, and the distance GH is calculated. L Is it greater than the threshold GH? Y , and grayscale mean Is it within the gray value range H of the guard plate? R When GH L >GH Y At the same time In H R Within the range, the coal cutter continues to work. L <GH Y ,at the same time In H R When it is within the range, the coal cutter stops working and the status of the guard plate is checked.

[0014] When only label H is detected, it means that the guard plate is not lifted, and GH is judged L Is it greater than the threshold GH? Y ,as well as Is it in H R When GH L >GH Y At the same time In H R Within the range, the coal cutter continues to work. L <GH Y ,at the same time In H R When it is within the range, the coal cutter stops working and the status of the guard plate is checked.

[0015] When only tag B is detected, it means that the guard plate is not lifted, and the distance GB is determined. L Is it greater than the threshold GB? Y , and grayscale mean Is it within the gray value range B of the marker? R In GB L >GB Y At the same time In B R The coal cutter continues to work within the range. L <GB Y At the same time In BR Within the range, the coal cutter stops working and the status of the guard plate is checked.

[0016] The advantages of the present invention are:

[0017] 1) A method for detecting the status of the guard plate of a fully mechanized coal mining face is suitable for coal mining scenes where smoke and dust are prone to occur. The infrared camera can penetrate the smoke and dust to obtain a clearer image than visible light. At the same time, it can distinguish between the roller, the guard plate and the marker in terms of grayscale value, making it easier to judge the working status of the roller and the guard plate.

[0018] 2) A method for detecting the status of the guard plate of a fully mechanized mining face in a coal mine, by adding a marker and detecting whether the marker exists, further confirming whether the guard plate is retracted, thereby improving the accuracy of the system and reducing the risk of safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a flow chart of a method for detecting the state of a side guard plate of a fully mechanized mining face in a coal mine according to the present invention;

[0020] Figure 2 A schematic diagram of a camera arrangement scheme in an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of posting a marker in an embodiment of the present invention;

[0022] Figure 4 A specific flow chart of detecting the working state of the side guard plate in an embodiment of the present invention; DETAILED DESCRIPTION

[0023] The following is a detailed and clear description of the implementation of the present invention in conjunction with the examples and drawings.

[0024] The present invention is a method for detecting the state of the guard plate of a fully-mechanized coal mining face. It is based on the radiation characteristics of an infrared imaging system and is used to detect the open and closed state of the guard plate of a fully-mechanized coal mining face. It determines whether the coal cutter continues to move forward by detecting whether the guard plate is lifted at any time, thereby reducing the occurrence of accidents. The present invention combines the advantages of infrared imaging, and can not only present the working state of the coal cutter in the process and the movement state of the coal miners in real time, but also detect in real time whether the guard plate is folded, effectively improving the safety of underground work. At the same time, it can also be further promoted to other high-risk work scenarios. For example, chemical plants, power plants, etc., to improve the work safety of workers.

[0025] like Figure 1 As shown, the specific steps are as follows:

[0026] Step 1: Install an infrared camera on every two hydraulic supports of the fully mechanized mining face of the coal mine. According to the length of the fully mechanized mining face, install a total of N infrared cameras to cover the entire fully mechanized mining face.

[0027] The infrared camera has explosion-proof and explosion-proof functions, AI target detection function, temperature measurement function, gray value real-time analysis function, and real-time upload of danger signal alarm function.

[0028] Step 2: Add a marker in the middle of each guard plate. The marker material has a different emissivity from the guard plate material and the coal seam.

[0029] The markers cannot affect the normal working of the guard plates. There is a clear distinction between the markers and the guard plates. The marker materials, guard plate materials and coal seams have different emissivity.

[0030] Step 3: Collect infrared image data of the side guard plate with and without the markers, make corresponding labels, and then package and save the label information into the memory of the infrared camera.

[0031] The coal cutter drum is detected as G, the guard plate is detected as H, and the marker is detected as B in the image, and the grayscale mean within the range of G, H, and B is calculated in real time. And the distance GH between the label G of the coal cutter drum and the label H of the guard plate L , the distance GB between the label G of the coal cutter drum and the label B of the marker L ;

[0032] The gray value range of the guard plate is H R , the gray value range of the marker is B R , the gray value range of coal mine is M R , the gray value range of the roller is G R The obtained tag information is packaged and saved in the infrared camera memory, and is called in real time during the camera operation.

[0033] Step 4: During the mining process of the fully mechanized coal mining face, the working status of the drum and the side guard plate is monitored and detected in real time by infrared cameras:

[0034] When both tag H and tag B are detected at the same time, it means that the guard plate is not lifted, and the distance GH is calculated. L Is it greater than the threshold GH? Y , and grayscale mean Is it within the gray value range H of the guard plate? R When GH L >GH Y At the same time In H R Within the range, the coal cutter continues to work. L <GH Y ,at the same time In H R When it is within the range, the coal cutter stops working and the status of the guard plate is checked.

[0035] When only label H is detected, it means that the guard plate is not lifted, and GH is judged L Is it greater than the threshold GH? Y ,as well as Is it in H R When GH L >GH Y At the same time In H R Within the range, the coal cutter continues to work. L <GH Y ,at the same time In H R When it is within the range, the coal cutter stops working and the status of the guard plate is checked.

[0036] When only tag B is detected, it means that the guard plate is not lifted, and the distance GB is determined. L Is it greater than the threshold GB? Y , and grayscale mean Is it within the gray value range B of the marker? R In GB L >GB Y At the same time In B R The coal cutter continues to work within the range. L <GB Y At the same time In B R Within the range, the coal cutter stops working and the status of the guard plate is checked.

[0037] Example:

[0038] Select an infrared thermal imaging camera with a resolution of 256*192, 384*288, or 640*512. Figure 2 As shown, it is installed on the hydraulic support. According to the length of the fully mechanized mining face, N infrared cameras are installed so that the field of view covers the entire fully mechanized mining face.

[0039] Select markers that are easy to identify and detect. The radiation rate of the marker material is inconsistent with the coal feeder, human body, guard plate and coal seam. The size of the marker is 30*30cm. Different guard plate sizes can be randomly adjusted according to the size of the guard plate.

[0040] like Figure 3 As shown, the marker is attached to the middle of the guard plate; when the guard plate is not raised, the camera can see the marker, and when the guard plate is retracted, the camera cannot see the marker. When the fully mechanized mining surface is very dusty and the camera cannot identify the marker, a heating device can be added to the marker to ensure that the camera can detect the marker.

[0041] like Figure 4 As shown, the guard plate status detection process is as follows:

[0042] When a camera detects the roller G, it means that the coal cutter has entered the field of view of the camera. It is determined whether the guard plate H and the marker B are detected in the field of view of the camera with the roller. When the guard plate H and the marker B are detected at the same time, it means that the guard plate is not lifted and only the information of the guard plate is needed. Calculate the distance GH between the guard plate H and the roller L , when GH L >GH Y When the GH L <GH Y , indicating that the drum is close to the guard plate and the guard plate has not been retracted in time. At this time, the coal cutter needs to stop moving forward and check the working status of the guard plate. In order to improve the accuracy of the detection, the average gray value of the guard plate can be further judged. Is it in H R Within the range. In H R Within the range, it can be determined that the detected side guard plate H is a side guard plate.

[0043] When only the guard plate H is detected, it means that the guard plate is not lifted, and only the information of the guard plate is needed. Calculate the distance GH between the guard plate H and the roller L , when GH L >GHY, it means the distance between the drum and the guard plate is safe, and the coal cutter can continue to move forward. L <GH Y , indicating that the drum is close to the guard plate and the guard plate has not been retracted in time. At this time, the coal cutter needs to stop moving forward and check the working status of the guard plate. In order to improve the accuracy of the detection, the average gray value of the guard plate can be further judged. Is it in H R Within the range. In H R Within the range, it can be determined that the detected side guard plate H is a side guard plate.

[0044] When only marker B is detected, it means that the guard plate is not lifted. Calculate the distance GB between the marker and the roller. L , judge GB L Is it greater than the threshold GB? Y , when GB L >GB Y When GB L <GB YIt indicates that the distance between the coal cutter and the guard plate is too close, which may cause potential safety hazards. The coal cutter should be stopped and the status of the guard plate should be checked.

[0045] In order to improve the detection accuracy of the marker and reduce false positives, the average gray value of the marker is calculated. judge Is it within the gray value range of the marker? In B R range, it can be determined that the detected marker is a correct marker.

Claims

1. A method for detecting the state of a side guard plate of a fully mechanized coal mining face, characterized in that: The specific steps are as follows: Step 1: Install an infrared camera on every two hydraulic supports of the fully mechanized mining face of the coal mine. According to the length of the fully mechanized mining face, install a total of N infrared cameras to cover the entire fully mechanized mining face; Step 2: Add a marker in the middle of the guard plate of each hydraulic support, and the marker material has a different emissivity from the guard plate material and the coal seam; Step 3: Collect infrared image data of the guard plate with and without the marker, label it accordingly, and then package and save the label information into the memory of the infrared camera; The roller label is G, the guard plate label is H, and the marker label is B in the image, and the grayscale mean within the range of G, H, and B is calculated in real time. And the distance GH between the label G of the coal cutter drum and the label H of the guard plate L , the distance GB between the label G of the coal cutter drum and the label B of the marker L ; Step 4: During the working process, the infrared camera is used to monitor and detect the working status of the roller and the side guard in real time: When both tag H and tag B are detected at the same time, it means that the guard plate is not lifted, and the distance GH is calculated. L Is it greater than the threshold GH? Y , and grayscale mean Is it within the gray value range H of the guard plate? R When GH L >GH Y At the same time In H R Within the range, the coal cutter continues to work. L <GH Y ,at the same time In H R When it is within the range, the coal cutter stops working and the status of the guard plate is checked; When only label H is detected, it means that the guard plate is not lifted, and GH is judged L Is it greater than the threshold GH? Y ,as well as Is it in H R When GH L >GH Y At the same time In H R Within the range, the coal cutter continues to work. L <GH Y ,at the same time In H R When it is within the range, the coal cutter stops working and the status of the guard plate is checked; When only tag B is detected, it means that the guard plate is not lifted, and the distance GB is determined. L Is it greater than the threshold GB? Y , and grayscale mean Is it within the gray value range B of the marker? R In GB L >GB Y At the same time In B R The coal cutter continues to work within the range. L <GB Y At the same time In B R Within the range, the coal cutter stops working and the status of the guard plate is checked.

2. A method for detecting the state of a side guard plate of a fully mechanized coal mining face according to claim 1, characterized in that: The infrared camera has explosion-proof and explosion-proof functions, AI target detection function, temperature measurement function, gray value real-time analysis function, and real-time upload of danger signal alarm function.

3. A method for detecting the state of a side guard plate of a fully mechanized coal mining face according to claim 1, characterized in that: The marker is attached in the middle of the guard plate; when the guard plate is not raised, the camera can see the marker, and when the guard plate is folded, the camera cannot see the marker.

4. A method for detecting the state of a side guard plate of a fully mechanized coal mining face according to claim 1, characterized in that: Add a heating device to the marker.

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