Coal pile foreign matter multichannel detection system based on electromagnetic method

Abstract

The invention belongs to the technical field of coal quality detection, and particularly relates to a coal pile foreign matter multichannel detection system based on an electromagnetic method, a detection device and a control system used for controlling the detection device, and the detection device comprises a movable support, multichannel electromagnetic method detection equipment, a computer and display equipment; the control system runs on a computer, the control system comprises an acquisition unit, a processing unit and a display unit, the acquisition unit drives the multi-channel electromagnetic method detection equipment to transversely slide at a constant speed by controlling the movable bracket, and meanwhile, the acquisition unit controls the multi-channel electromagnetic method detection equipment to carry out data acquisition based on electromagnetic wave reflection; the coal pile foreign matter detection system is characterized in that the coal pile foreign matter detection system is used for collecting foreign matter in a coal pile and sending collected data to a processing unit, the processing unit recognizes the position of a foreign matter through computer processing and sends a processing result to a display unit, and the display unit displays and stores the position of the foreign matter in the coal pile in real time. Therefore, the safety of the coal in each transportation link is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of coal quality detection, and in particular relates to a coal pile foreign matter multi-channel detection system based on an electromagnetic method. Background Art

[0002] During the mining and transportation process in the mine, coal may be mixed with metal, stones and other foreign objects. The types of foreign objects mainly include: metal foreign objects (such as steel bars, iron sheets, nails and other metal materials), plastic foreign objects (such as plastic bags, plastic sheets, plastic wires and other plastic products), stones and rocks (stones or rocks that may be mixed into the coal pile during mining or transportation), wood foreign objects (wooden materials such as wood chips, sticks, sawdust, etc.) and other rubber products.

[0003] During railway transportation, coal stations are the main places for loading coal. Before loading, it is necessary to quickly inspect the coal piles stored on the coal station platform and identify foreign objects in time. The volume and length of the coal pile are generally consistent with the length of the train, about 1000m, 3m wide, and 2m high, with a regular trapezoidal cross section, such as Figure 1 , 2 shown.

[0004] The presence of foreign matter in the coal pile may have a negative impact on the combustion process and equipment operation, including: ① Safety risk: foreign matter such as metal, plastic, etc. may cause the risk of fire or explosion, especially in the high temperature and high pressure coal combustion environment. ② Impact on combustion efficiency: foreign matter may cause incomplete combustion of coal, affect combustion efficiency, and increase fuel consumption. ③ Damage to equipment: foreign matter may damage combustion equipment or cause blockage, affecting the stable operation of equipment. ④ Environmental pollution: harmful gases released during the combustion process may increase, leading to environmental pollution. Therefore, detecting and removing foreign matter in the coal pile is crucial to ensure the smooth progress of the combustion process and the safe and stable operation of the equipment. In addition, in the coal transportation and loading and unloading process, especially in the process of loading and unloading using the transmission belt at the port, if there are foreign matter such as metal, wood or large coal blocks in the coal, it will affect the safe operation of the transmission belt. Therefore, it is very important to detect and remove foreign matter in the coal pile in a timely manner, which can ensure the efficient and safe combustion process, minimize environmental pollution, and ensure the safety of coal in the loading and unloading process of each transportation link; for this purpose, the present invention proposes a coal pile foreign matter multi-channel detection system based on electromagnetic method. Summary of the invention

[0005] The purpose of the present invention is to provide a coal pile foreign body multi-channel detection system based on electromagnetic method, which can quickly detect and identify foreign bodies in the coal pile to ensure the safety of coal in all links of transportation.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A multi-channel detection system for foreign matter in a coal pile based on electromagnetic method, comprising a detection device and a control system for controlling the detection device, wherein the detection device comprises a mobile support, a multi-channel electromagnetic detection device, a computer and a display device, wherein the multi-channel electromagnetic detection device is installed on the mobile support, and the mobile support, the multi-channel electromagnetic detection device and the display device are all electrically and communicatively connected to the computer; the control system runs on the computer, and the control system comprises an acquisition unit, a processing unit and a display unit, wherein the acquisition unit drives the multi-channel electromagnetic detection device to slide laterally at a uniform speed by controlling the mobile support, and at the same time, the acquisition unit controls the multi-channel electromagnetic detection device to perform data acquisition based on electromagnetic wave reflection, and sends the acquired data to the processing unit, wherein the processing unit identifies the position of the foreign matter through computer processing, and sends the processing result to the display unit, and the display unit displays and stores the position of the foreign matter in the coal pile in real time through the display device.

[0008] Preferably, the multi-channel electromagnetic detection equipment includes seventeen test channel acquisition devices arranged on a mobile bracket, and the line spacing of each test channel acquisition device is 18 cm, that is, 17 channels of electromagnetic method are used for synchronous rapid detection, and each channel acquisition device is 15 cm wide, 30 cm long and 15 cm high.

[0009] Preferably, each of the test channel acquisition devices includes a transmitter and a receiver.

[0010] Preferably, the transmitter simultaneously transmits high-frequency electromagnetic waves and pulse transient electromagnetic signals, and the receiver simultaneously receives high-frequency electromagnetic wave reflection signals and pulse electromagnetic wave induction signals; when the high-frequency electromagnetic wave encounters foreign objects in the coal pile such as metal bodies, stones, and plastics during propagation in the coal pile, electromagnetic wave reflection will occur, and the electromagnetic signal receiving device in the receiver can receive the reflected electromagnetic signal from the foreign objects; the pulse transient electromagnetic signal establishes an induced electromagnetic field in the coal pile, and the electromagnetic coil in the receiver mainly receives the induction signal of the metal foreign objects in the coal pile; the collected data is synchronously transmitted to the processing unit running on the computer in the dispatching room in real time, and after processing and identification, the anomaly in the coal pile is obtained and the specific spatial position is marked, and then it is displayed and stored in real time through the display unit using the display device. The present invention can timely detect the anomaly in the coal pile and mark the specific spatial position, which is convenient for timely excavation and removal.

[0011] Preferably, the frequency range of the high-frequency electromagnetic wave is 400 MHz-800 MHz, and the pulse electromagnetic signal adopts a transient electromagnetic signal.

[0012] Preferably, the processing unit includes three-dimensional data volume display, digital filtering processing, profiles of the survey lines corresponding to the 17 channels, step-by-step display in the three directions of X, Y and Z, and real-time identification and marking of foreign body responses.

[0013] The technical effects achieved by the present invention are:

[0014] This patent mainly targets the coal piles stacked along the railway platform in the working environment of the coal station. It uses multi-channel electromagnetic technology to quickly detect and identify metals, wood blocks, plastics, stones and larger coal blocks in the coal piles in real time. It develops key technologies and equipment for rapid detection and identification of foreign objects in coal piles based on electromagnetic wave detection, effectively removes foreign objects in the coal piles before loading, and ensures safe operation of all links of transportation and transshipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the arrangement of the coal pile detection measurement line of the present invention;

[0016] Figure 2 It is a schematic diagram of the coal pile cross section and multi-channel detection of the present invention;

[0017] Figure 3 It is a schematic diagram of the high-frequency electromagnetic wave detection working process of the present invention;

[0018] Figure 4 It is a schematic diagram of the pulse signal sensing working principle of the present invention;

[0019] Figure 5 It is the electromagnetic response profile of each measuring line of the present invention;

[0020] Figure 6 It is the three-dimensional data body and dynamic graphs in various directions of the present invention. DETAILED DESCRIPTION

[0021] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention.

[0022] A coal pile foreign body multi-channel detection system based on electromagnetic method comprises a detection device and a control system for controlling the detection device, wherein the detection device comprises a mobile support, a multi-channel electromagnetic detection device, a computer and a display device, wherein the multi-channel electromagnetic detection device is installed on the mobile support, and the mobile support, the multi-channel electromagnetic detection device and the display device are all electrically and communicatively connected to the computer; the control system runs on the computer, and the control system comprises a collection unit, a processing unit and a display unit, wherein the collection unit drives the multi-channel electromagnetic detection device to slide laterally at a uniform speed by controlling the mobile support, and at the same time, the collection unit controls the multi-channel electromagnetic detection device to collect data based on electromagnetic wave reflection, and sends the collected data to the processing unit, the processing unit identifies the position of the foreign body through computer processing, and sends the processing result to the display unit, and the display unit displays and stores the position of the foreign body in the coal pile in real time through the display device.

[0023] Preferably, the multi-channel electromagnetic detection equipment includes seventeen test channel acquisition devices arranged on a mobile bracket, and the line spacing of each test channel acquisition device is 18 cm, that is, 17 channels of electromagnetic method are used for synchronous rapid detection, and each channel acquisition device is 15 cm wide, 30 cm long and 15 cm high.

[0024] Preferably, each test channel acquisition device includes a transmitter and a receiver.

[0025] Preferably, the transmitter transmits high-frequency electromagnetic waves and pulse transient electromagnetic signals simultaneously, and the receiver receives high-frequency electromagnetic wave reflection signals and pulse electromagnetic wave induction signals simultaneously; when the high-frequency electromagnetic waves encounter foreign objects in the coal pile such as metal bodies, stones, and plastics during propagation in the coal pile, electromagnetic wave reflection will occur, and the electromagnetic signal receiving device in the receiver can receive the reflected electromagnetic signal from the foreign objects, such as Figure 3 As shown in the figure, the pulse transient electromagnetic signal establishes an induced electromagnetic field in the coal pile, and the electromagnetic coil in the receiver mainly receives the induced signal of the metal foreign matter in the coal pile, such as Figure 4 The collected data is synchronously transmitted to the processing unit running on the computer in the dispatching room in real time. After processing and identification, the abnormality in the coal pile is obtained and the specific spatial position is marked. Then, the abnormality is displayed and stored in real time through the display unit using the display device. The present invention can timely detect the abnormality in the coal pile and mark the specific spatial position, which is convenient for timely excavation and removal.

[0026] Preferably, the frequency range of the high-frequency electromagnetic wave is 400 MHz-800 MHz, and the pulse electromagnetic signal adopts a transient electromagnetic signal.

[0027] Preferably, the processing unit includes three-dimensional data volume display, digital filtering processing, profiles of the survey lines corresponding to the 17 channels, step-by-step display in the three directions of X, Y and Z, and real-time identification and marking of foreign body responses.

[0028] The working principle of the present invention in actual use:

[0029] like Figure 1 As shown, the length of the coal pile is the same as the length of the train. The length of the carriages varies with the load of different trains. Based on 60 carriages, the length of the coal pile is 900-1200 meters. The cross-section of the coal pile is about 2.5-3 meters wide, 3-3.5 meters wide at the bottom, and 2 meters high. The distance between each measuring line is no more than 20 cm.

[0030] like Figure 2 As shown, the cross-section of the coal pile is a trapezoid, with an upper width of 2.5-3m, a lower width of 3-3.5m, and a height of 2m. According to the specific width of the upper end of the coal pile, the number of channels of the multi-channel electromagnetic detection equipment can be adjusted under the condition that the line spacing is not greater than 20cm. The height of the mobile bracket is greater than 2m and the height is adjustable. The width of the mobile bracket is not less than 3.5m and the width is adjustable. During the detection process, it should move at a uniform speed along the direction of the coal pile, and the specific moving speed should match the time interval of the multi-channel automatic detection.

[0031] like Figure 3 As shown, when high-frequency electromagnetic waves encounter foreign objects in the coal pile, such as metal objects, stones, and plastics, during propagation in the coal pile, electromagnetic wave reflection will occur, and the receiving device in the receiver can receive the reflected electromagnetic signals from the foreign objects.

[0032] like Figure 4 As shown, the pulse transient electromagnetic signal establishes an induced electromagnetic field in the coal pile, and the electromagnetic coil in the receiver mainly receives the induced signal of the metal foreign matter in the coal pile.

[0033] like Figure 5 As shown, after the detection data is processed in real time, it is identified and displayed on the display device, and the electromagnetic response profile of the foreign matter in the coal pile of each measuring line is displayed synchronously. The spatial position of the foreign matter can be identified from each profile and marked in time.

[0034] like Figure 6 As shown in the figure, after the overall detection data of the coal pile is collected, a three-dimensional electromagnetic response data body consistent with the shape of the coal pile is formed in the real-time processing and identification display system. It can be dynamically displayed point by point along the X, Y, and Z directions respectively, and the spatial position of the foreign body response can be identified and marked, and compared with the profile of each measuring line for comprehensive interpretation, giving the specific spatial position of the detected foreign body.

[0035] During the operation of the electromagnetic method of coal pile foreign body multi-channel detection system, each channel can be regarded as a combination of a transmitter and a receiver. The transmitter can simultaneously emit high-frequency electromagnetic waves and pulse transient electromagnetic signals, where the frequency range of high-frequency electromagnetic waves is 400MHz to 800MHz, and the pulse electromagnetic signals are mainly transient electromagnetic signals. The receiver can simultaneously receive high-frequency electromagnetic wave reflection signals and pulse electromagnetic wave induction signals. When high-frequency electromagnetic waves encounter foreign bodies in the coal pile, such as metal bodies, stones, and plastics, during propagation in the coal pile, electromagnetic wave reflection will occur. The receiver in the receiving unit can receive the reflected electromagnetic signals from the foreign bodies, such as Figure 5 The pulse transient electromagnetic signal establishes an induced electromagnetic field in the coal pile, and the electromagnetic coil in the receiving unit mainly receives the induced signal of the metal foreign matter in the coal pile, such as Figure 6 As shown. When electromagnetic waves propagate in the coal pile medium, their path, induced field strength and waveform will change with the physical parameters and geometric shape of the medium through which they pass. Therefore, based on the waveform data such as the reflection time of the received wave and the attenuation process, amplitude and frequency of the induced signal, the distribution of foreign matter in the coal pile can be inferred.

[0036] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A multi-channel detection system for foreign matter in coal piles based on electromagnetic method, characterized in that: The invention comprises a detection device and a control system for controlling the detection device, wherein the detection device comprises a mobile support, a multi-channel electromagnetic detection device, a computer and a display device, wherein the multi-channel electromagnetic detection device is installed on the mobile support, and the mobile support, the multi-channel electromagnetic detection device and the display device are all electrically and communicatively connected to the computer; the control system runs on the computer, and the control system comprises a collection unit, a processing unit and a display unit, wherein the collection unit drives the multi-channel electromagnetic detection device to slide laterally at a uniform speed by controlling the mobile support, and at the same time, the collection unit controls the multi-channel electromagnetic detection device to collect data based on electromagnetic wave reflection, and sends the collected data to the processing unit, wherein the processing unit identifies the position of the foreign matter through computer processing, and sends the processing result to the display unit, and the display unit displays and stores the position of the foreign matter in the coal pile in real time through the display device.

2. According to claim 1, a multi-channel detection system for foreign matter in coal piles based on electromagnetic method is characterized by: The multi-channel electromagnetic detection equipment includes seventeen test channel acquisition devices arranged on a mobile bracket, and the line spacing of each test channel acquisition device is 18 cm, that is, 17 channels of electromagnetic method are used for synchronous rapid detection. Each channel acquisition device is 15 cm wide, 30 cm long and 15 cm high.

3. The multi-channel detection system for foreign matter in coal piles based on electromagnetic method according to claim 2 is characterized by: Each of the test channel acquisition devices includes a transmitter and a receiver.

4. The multi-channel detection system for foreign matter in coal piles based on electromagnetic method according to claim 3 is characterized by: The transmitter simultaneously transmits high-frequency electromagnetic waves and pulse transient electromagnetic signals, and the receiver simultaneously receives high-frequency electromagnetic wave reflection signals and pulse electromagnetic wave induction signals; when the high-frequency electromagnetic wave encounters foreign matter in the coal pile during propagation in the coal pile, electromagnetic wave reflection will occur, and the electromagnetic signal receiving device in the receiver can receive the reflected electromagnetic signal from the foreign matter; the pulse transient electromagnetic signal establishes an induced electromagnetic field in the coal pile, and the electromagnetic coil in the receiver mainly receives the induction signal of the metal foreign matter in the coal pile; the collected data is synchronously transmitted to the processing unit running on the computer in the dispatching room in real time, and after processing and identification, the anomaly in the coal pile is obtained and the specific spatial position is marked, and then it is displayed and stored in real time through the display unit using the display device.

5. The multi-channel detection system for foreign matter in coal piles based on electromagnetic method according to claim 4 is characterized by: The frequency range of high-frequency electromagnetic waves is 400MHz-800MHz, and the pulse electromagnetic signal adopts a transient electromagnetic signal.

6. The multi-channel detection system for foreign matter in coal piles based on electromagnetic method according to claim 5 is characterized by: The processing unit includes three-dimensional data volume display, digital filtering processing, 17 channels corresponding to the measurement line profile, X, Y, Z three directions of gradual display and real-time identification and marking of foreign body response.

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