Material detection equipment and method

Abstract

The invention provides material detection equipment and a material detection method. The detection equipment comprises a material distributor, a coal quality detection channel, a material identification device and a processing device, the distributing device is used for conveying a to-be-detected material to an inlet of the coal quality detection channel; the coal quality detection channel is obliquely arranged, so that materials pass through the coal quality detection channel by utilizing gravity; the material identification device comprises an X-ray source and a linear array detector which are arranged on the two sides of the coal quality detection channel, and is used for detecting the movement speed of the material penetrating through the coal quality detection channel and the ray absorption rate of the material at different positions in the target width direction; the target width is the maximum projection width of the material projected on the coal quality detection channel and perpendicular to the movement direction; and the processing device is used for determining the material type of the material. The accuracy of material detection can be improved.

Description

[0001] Priority Statement

[0002] This application claims the priority of a Chinese patent application filed with the China National Intellectual Property Administration on April 24, 2024, with the application number 202410494920.7 and the invention title "Material Detection Equipment and Method", the entire content of which is incorporated herein by reference. Technical Field

[0003] This application relates to the technical field of coal detection, and particularly to a material detection equipment and method. Background Art

[0004] Dry coal preparation has unique advantages in the field of coal separation due to its essential characteristics of not using water, not using medium, and not producing slime. In dry coal preparation, the most basic detection method for coal quality is the ash content detection method.

[0005] In the prior art, the equipment for ash content detection can be a transmission type ash meter. Among them, since coal is mostly composed of organic matter and gangue is mostly composed of inorganic matter, and there is a large difference in the ray absorption rates between organic matter and inorganic matter, the transmission type ash meter detects the ash content of the product by detecting the average absorption rate of rays by a product with a certain thickness, and determines the type of coal material to which the coal material belongs according to the ash content of the coal material.

[0006] However, the inventors found that the prior art has at least the following technical problems: Since the speeds of blocks with different shapes are different in the slope channel, which affects the average absorption rate, and further leads to a large error in detecting the ash content of the product, the accuracy of detecting materials by the above method is relatively low. Summary of the Invention

[0007] Based on this, this application provides a material detection equipment and method, which can improve the accuracy of material detection.

[0008] On the one hand, this application provides a material detection equipment, including: a distributor, a coal quality detection channel, a material identification device, and a processing device;

[0009] The distributor is used to convey the material to be detected to the entrance of the coal quality detection channel; the coal quality detection channel is inclined so that the material passes through the coal quality detection channel by gravity;

[0010] The material identification device includes an X-ray source and a linear array detector arranged on both sides of the coal quality detection channel. The material identification device is used to detect the movement speed of the material passing through the coal quality detection channel and the ray absorption rates at different positions of the material in the target width direction; wherein, the target width is the maximum projection width of the material projected onto the coal quality detection channel and perpendicular to the movement direction;

[0011] The processing device is configured to determine the first shape information of the material according to the moving speed of the material, and determine the second shape information of the material according to the ray absorption rates of the material at different positions in the target width direction; wherein, the first shape information and the second shape information include: circular and sheet-shaped; if the results of the first shape information and the second shape information are consistent and both are circular, it is determined that the shape of the material is circular; if the results of the first shape information and the second shape information are consistent and both are sheet-shaped, it is determined that the shape of the material is sheet-shaped; if the results of the first shape information and the second shape information are inconsistent, it is determined that the shape of the material is quasi-circular; according to the shape of the material, determine the average ray absorption rate corresponding to the material, and determine the material type to which the material belongs according to the average ray absorption rate.

[0012] In a possible implementation manner, the coal quality detection channel in the detection device of the material is inclined at a preset angle with the horizontal direction; wherein, the range of the preset angle is: greater than or equal to 30 degrees and less than or equal to 75 degrees.

[0013] In a possible implementation manner, the spreader includes a spreading table and a vibrating plate; wherein, the vibrating plate is located below the spreading table and is used to support the spreading table, and the vibrating plate evenly spreads a plurality of materials placed on the spreading table through vibration.

[0014] On the other hand, the present application provides a method for detecting a material, which is applied to the detection device of the material in any of the above possible implementation manners, and the method includes:

[0015] Obtain the moving speed of the material passing through the coal quality detection channel and the ray absorption rates of the material at different positions in the target width direction; the target width is the maximum projection width of the material projected on the coal quality detection channel and perpendicular to the moving direction;

[0016] Determine the first shape information of the material according to the moving speed of the material, and determine the second shape information of the material according to the ray absorption rates of the material at different positions in the target width direction; wherein, the first shape information and the second shape information include: circular and sheet-shaped;

[0017] If the results of the first shape information and the second shape information are consistent and both are circular, it is determined that the shape of the material is circular; if the results of the first shape information and the second shape information are consistent and both are sheet-shaped, it is determined that the shape of the material is sheet-shaped; if the results of the first shape information and the second shape information are inconsistent, it is determined that the shape of the material is quasi-circular;

[0018] Determine the average ray absorption rate corresponding to the material according to the shape of the material, and determine the material type to which the material belongs according to the average ray absorption rate.

[0019] In a possible implementation manner, the determining the first shape information of the material according to the moving speed of the material includes: if the moving speed of the material is greater than or equal to a preset speed, determining the first shape information of the material as circular; if the moving speed of the material is less than the preset speed, determining the first shape information of the material as sheet-shaped.

[0020] In a possible implementation manner, the determining the second shape information of the material according to the ray absorption rates at different positions of the material in the target width direction includes: determining the absolute value of the change rate of the ray absorption rates at different positions of the material in the target width direction according to the ray absorption rates at different positions of the material in the target width direction, where the absolute value of the change rate of the ray absorption rates is the absolute value of the first-order derivative of the ray absorption rate in the target width direction; determining the second shape information of the material according to the absolute value of the change rate of the ray absorption rates at different positions of the material in the target width direction.

[0021] In a possible implementation manner, the determining the second shape information of the material according to the absolute value of the change rate of the ray absorption rates at different positions of the material in the target width direction includes: determining the first width from the starting position to the first position of the material in the target width direction according to the absolute value of the change rate of the ray absorption rates at different positions of the material in the target width direction, and determining the second width from the first position to the second position of the material in the target width direction, and determining the third width from the second position to the end position of the material in the target width direction; determining the second shape information of the material according to the first width, the second width, and the third width; where the absolute value of the change rate of the ray absorption rate from the starting position to the first position is greater than or equal to a preset attenuation rate threshold, the absolute value of the change rate of the ray absorption rate from the first position to the second position is less than the preset attenuation rate threshold, and the absolute value of the change rate of the ray absorption rate from the second position to the end position is greater than or equal to the preset attenuation rate threshold.

[0022] In a possible implementation manner, the determining the second shape information of the material according to the first width, the second width, and the third width includes: determining the sum of the first width and the third width, and determining the ratio of the second width to the sum of the first width and the third width;

[0023] If the ratio is less than 1, determine that the result of the second shape information of the material is circular; if the ratio is greater than or equal to 1, determine that the result of the second shape information of the material is flaky.

[0024] In a possible implementation, the determining the average ray absorption rate corresponding to the material according to the shape of the material includes: if the shape of the material is circular, determining the average ray absorption rate corresponding to the material according to the ratio of the sum of the ray absorption rates at different positions of the material in the target width direction to the sum of the first width, the second width, and the third width; if the shape of the material is flaky, determining the average ray absorption rate corresponding to the material according to the ratio of the sum of the ray absorption rates at different positions of the material in the target width direction to the sum of the first width and the third width; if the shape of the material is quasi-circular, determining the average ray absorption rate corresponding to the material according to the ratio of the sum of the ray absorption rates at different positions of the material in the target width direction to the sum of the first width, half of the second width, and the third width.

[0025] In a possible implementation, the determining the material type to which the material belongs according to the average ray absorption rate includes: if the average ray absorption rate is greater than or equal to a preset ray absorption rate, determining that the material belongs to a first-density material; if the average ray absorption rate is less than the preset ray absorption rate, determining that the material belongs to a second-density material, where the density of the first-density material is greater than the density of the second-density material.

[0026] The present application provides a material detection device and method. The detection device includes: a feeder, a coal quality detection channel, a material identification device, and a processing device; the feeder is configured to convey the material to be detected to the entrance of the coal quality detection channel; the coal quality detection channel is inclined so that the material passes through the coal quality detection channel by gravity; the material identification device includes an X-ray source and a linear array detector arranged on both sides of the coal quality detection channel, and the material identification device is configured to detect the moving speed of the material passing through the coal quality detection channel and the ray absorption rate of the material at different positions in the target width direction; wherein, the target width is the maximum projection width of the material projected onto the coal quality detection channel and perpendicular to the moving direction; the processing device is configured to determine the first shape information of the material according to the moving speed of the material, and determine the second shape information of the material according to the ray absorption rate of the material at different positions in the target width direction; wherein, the first shape information and the second shape information include: circular and sheet-shaped; if the results of the first shape information and the second shape information are consistent and both are circular, it is determined that the shape of the material is circular; if the results of the first shape information and the second shape information are consistent and both are sheet-shaped, it is determined that the shape of the material is sheet-shaped; if the results of the first shape information and the second shape information are inconsistent, it is determined that the shape of the material is quasi-circular; according to the shape of the material, the corresponding average ray absorption rate of the material is determined, and according to the average ray absorption rate, the material type to which the material belongs is determined.

[0027] In the embodiment of the present application, first, the material identification device detects the moving speed of the material passing through the coal quality detection channel and the ray absorption rate of the material at different positions in the target width direction, then determines the shape information of the material from the dimensions of the moving speed and the ray absorption rate respectively, combines the information of the two dimensions to determine the final shape of the material, and finally combines the final shape of the material to determine the corresponding average ray absorption rate of the material, and determines the material type to which the material belongs according to the average ray absorption rate. It can be seen that by combining the information of the two dimensions of the moving speed and the ray absorption rate, the accuracy of determining the shape of the material can be improved, and by determining the corresponding average ray absorption rate of the material according to the shape of the material, the influence of the shape on the average ray absorption rate can be reduced. That is, the average ray absorption rate is calibrated by the material shape, thereby improving the accuracy of the determined average ray absorption rate, and further improving the accuracy of detecting the material type by this detection device. Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 Schematic structural diagram of a material detection device provided by an embodiment of the present application;

[0030] Figure 2 Schematic diagram of a target width provided by an embodiment of the present application;

[0031] Figure 3 Flowchart of a material detection method provided by an embodiment of the present application;

[0032] Figure 4 Schematic diagram of the maximum projected width of a material in the moving direction provided by an embodiment of the present application;

[0033] Figure 5 Schematic diagram of the ray absorption rate of a circular material provided by an embodiment of the present application;

[0034] Figure 6 Schematic diagram of the ray absorption rate of a sheet-shaped material provided by an embodiment of the present application;

[0035] Figure 7 Schematic diagram of the absolute value of the change rate of the ray absorption rate of a circular material provided by an embodiment of the present application;

[0036] Figure 8 Schematic diagram of the absolute value of the change rate of the ray absorption rate of a sheet-shaped material provided by an embodiment of the present application.

[0037] Reference numerals:

[0038] 101: Distributor;

[0039] 102: Coal quality detection channel;

[0040] 103: Material identification device;

[0041] 1031: X-ray source;

[0042] 1032: Linear array detector;

[0043] 104: Processing device. Detailed implementation manners

[0044] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present application. On the contrary, they are merely examples of methods and devices consistent with some aspects of the present application as detailed in the appended claims.

[0045] In the description, claims, and the above-mentioned drawings of the present application, the terms "first", "second", "third", "fourth", etc. (if any) are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0046] Due to the essential characteristics of not using water, medium, and not generating slime, dry coal preparation has unique advantages in the field of coal separation. In dry coal preparation, the most basic detection method for coal quality is the ash content detection method.

[0047] In the prior art, the equipment for ash content detection can be a transmission-type ash meter. Among them, since coal is mostly composed of organic matter and gangue is mostly composed of inorganic matter, and there is a large difference in the ray absorption rates between organic matter and inorganic matter, the transmission-type ash meter detects the ash content of the product by detecting the average absorption rate of rays by a product of a certain thickness, and determines the type of coal material to which the coal material belongs according to the ash content of the coal material. However, since the speeds of different-shaped blocks in the slope channel are different, which affects the average absorption rate and thus leads to a large error in detecting the ash content of the product, the accuracy of detecting the material by the above method is relatively low.

[0048] In view of the above problems existing in the prior art, the material detection device provided in this application includes: a feeder, a coal quality detection channel, a material identification device, and a processing device; the feeder is used to convey the material to be detected to the entrance of the coal quality detection channel; the coal quality detection channel is inclined so that the material passes through the coal quality detection channel by gravity; the material identification device includes an X-ray source and a linear array detector arranged on both sides of the coal quality detection channel, and the material identification device is used to detect the moving speed of the material passing through the coal quality detection channel and the ray absorption rate of the material at different positions in the target width direction; wherein, the target width is the maximum projection width of the material projected on the coal quality detection channel and perpendicular to the moving direction; the processing device is used to determine the first shape information of the material according to the moving speed of the material, and determine the second shape information of the material according to the ray absorption rate of the material at different positions in the target width direction; wherein, the first shape information and the second shape information include: circular and sheet-shaped; if the results of the first shape information and the second shape information are consistent and both are circular, it is determined that the shape of the material is circular; if the results of the first shape information and the second shape information are consistent and both are sheet-shaped, it is determined that the shape of the material is sheet-shaped; if the results of the first shape information and the second shape information are inconsistent, it is determined that the shape of the material is oval-shaped; according to the shape of the material, the corresponding average ray absorption rate of the material is determined, and according to the average ray absorption rate, the material type to which the material belongs is determined.

[0049] In the embodiment of the present application, first, the material identification device is used to detect the moving speed of the material passing through the coal quality detection channel and the ray absorption rate of the material at different positions in the target width direction, then the shape information of the material is determined respectively from the dimensions of the moving speed and the ray absorption rate, the final shape of the material is determined by combining the information of the two dimensions, and finally, in combination with the final shape of the material, the corresponding average ray absorption rate of the material is determined, and according to the average ray absorption rate, the material type to which the material belongs is determined. It can be seen that by combining the information of the two dimensions of the moving speed and the ray absorption rate, the accuracy of determining the shape of the material can be improved, and by determining the corresponding average ray absorption rate of the material according to the shape of the material, the influence of the shape on the average ray absorption rate can be reduced. That is to say, the average ray absorption rate is calibrated by the material shape, thereby improving the accuracy of the determined average ray absorption rate, and further improving the accuracy of detecting the material type by this detection device.

[0050] The technical solution of the present application will be described in detail below with specific embodiments in conjunction with the accompanying drawings. These specific embodiments below can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0051] Among them, Figure 1 is a schematic structural diagram of a material detection device provided in an embodiment of the present application.

[0052] Referring to Figure 1 as shown, the detection device for the material includes: a distributor 101, a coal quality detection channel 102, a material identification device 103, and a processing device 104;

[0053] Among them, the distributor 101 is used to convey the material to be detected to the entrance of the coal quality detection channel 102; the coal quality detection channel 102 is inclined so that the material passes through the coal quality detection channel 102 by gravity;

[0054] Among them, the material identification device 103 includes an X-ray source 1031 and a linear array detector 1032 arranged on both sides of the coal quality detection channel 102. The material identification device 103 is used to detect the moving speed of the material passing through the coal quality detection channel 102 and the ray absorption rate at different positions of the material in the target width direction; among them, the target width is the maximum projected width of the material projected onto the coal quality detection channel and perpendicular to the moving direction;

[0055] Among them, the processing device 104 is used to determine the first shape information of the material according to the moving speed of the material, and to determine the second shape information of the material according to the ray absorption rate at different positions of the material in the target width direction; among them, the first shape information and the second shape information include: circular and sheet-shaped; if the results of the first shape information and the second shape information are consistent and both are circular, it is determined that the shape of the material is circular; if the results of the first shape information and the second shape information are consistent and both are sheet-shaped, it is determined that the shape of the material is sheet-shaped; if the results of the first shape information and the second shape information are inconsistent, it is determined that the shape of the material is quasi-circular; according to the shape of the material, the average ray absorption rate corresponding to the material is determined, and according to the average ray absorption rate, the material type to which the material belongs is determined.

[0056] Among them, during the process of the material passing through the coal quality detection channel 102, the moving direction of the material and the axial direction of the coal quality detection channel 102 are the same direction. It can be understood that the X-ray source 1031 and the linear array detector 1032 in the material identification device 103 are arranged oppositely. The material moves along the axial direction of the coal quality detection channel 102. During the process of passing through the material identification device 103, the X-rays emitted by the X-ray source 1031 pass through the material and are received by the linear array detector 1032. Part of the X-rays are absorbed by the material. At this time, the intensity of the X-rays received by the linear array detector 1032 is less than the intensity of the X-rays emitted by the X-ray source 1031. Among them, the thicker a certain position of the material is, the more X-rays are absorbed by the material.

[0057] In some embodiments, the target width is the maximum projected width of the material projected onto the coal quality detection channel and perpendicular to the moving direction. In this case, it can be determined by measuring the peak value of the projected width of the material projected onto the coal quality detection channel and perpendicular to the moving direction.

[0058] In some other embodiments, as Figure 2 shown, the X-rays emitted by the X-ray source 1031 are fan-shaped ray beams, which can cover the entire cross-section of the material, and the linear array detector 1032 receives the fan-shaped ray beams after passing through the material. It can be understood that when the X-ray source 1031 scans at a fixed frequency, the running speed of the circular material is relatively high, and the number of linear array scans is relatively small; the running speed of the sheet-shaped material is relatively low, and the number of linear array scans is relatively large. In this case, the target width of the material is equal to the longest scan width of the material. In this embodiment, the value of the scan frequency of the X-ray source 1031 is not specifically limited and can be set and modified as needed. Exemplarily, the scan frequency of the X-ray source 1031 is: 500 Hz.

[0059] In a possible implementation manner, the coal quality detection channel 102 in the material detection device is inclined at a preset angle with the horizontal direction; wherein, the range of the preset angle is: greater than or equal to 30 degrees and less than or equal to 75 degrees.

[0060] In a possible implementation manner, the distributor 101 includes a distribution table and a vibration plate; wherein, the vibration plate is located below the distribution table and is used to support the distribution table, and the vibration plate evenly spreads a plurality of materials placed on the distribution table through vibration.

[0061] In the embodiment of the present application, since the material detection device can determine the average ray absorption rate corresponding to the material through the first shape information and the second shape information of the material and the ray absorption rates at different positions of the material in the target width direction, the influence of the thickness on the average ray absorption rate is reduced. That is, the average ray absorption rate is calibrated through the material shape, thereby improving the accuracy of the determined average ray absorption rate, and further improving the accuracy of detecting the type of the material by the detection device.

[0062] Figure 3 It is a flowchart of a method for detecting a material provided by an embodiment of the present application. The method for detecting a material can be applied to the material detection device in any of the above possible implementation manners. As Figure 3 shown, the method for detecting a material includes:

[0063] S301. Obtain the moving speed of the material passing through the coal quality detection channel and the ray absorption rates at different positions of the material in the target width direction; the target width is the maximum projection width of the material projected on the coal quality detection channel and perpendicular to the moving direction.

[0064] Optionally, the material passes through the X-ray source and the linear array detector arranged on both sides of the coal quality detection channel in a certain posture. The circular material rolls in the coal quality detection channel and accelerates relatively fast, and the speed when reaching the position of the material recognition device is relatively large. The flaky material slides in the coal quality detection channel and accelerates relatively slowly, and the speed when reaching the position of the material recognition device is relatively small.

[0065] Optionally, the processing device can obtain the moving speed of the material by detecting the maximum projection width s of the material in the moving direction and the time t for the material to pass through the material recognition device, and the moving speed of the material is: v = s / t. Wherein, the maximum projection width of the material in the moving direction is as Figure 4 shown.

[0066] Optionally, the processing device can obtain the ray absorption rates of the material at different positions in the target width direction through the X-ray source and the linear array detector arranged on both sides of the coal quality detection channel. Wherein, the X-ray source is used to emit X-rays with a preset intensity; the linear array detector is used to receive the X-rays attenuated after passing through the material.

[0067] In a possible implementation manner, the processing device is communicatively connected to the X-ray source and the linear array detector respectively. The processing device can obtain the X-rays with a preset intensity and the X-rays attenuated after passing through the material from the X-ray source and the linear array detector through this communication connection. Then, the processing device obtains the ray absorption rates of the material at different positions in the target width direction according to the X-rays with a preset intensity and the X-rays attenuated after passing through the material.

[0068] Optionally, the ray absorption rate at a certain position is: the ratio of the intensity of the attenuated X-rays to the preset intensity; wherein, the intensity of the attenuated X-rays is equal to: the intensity difference between the X-rays with a preset intensity and the X-rays attenuated after passing through the material.

[0069] S302. Determine the first shape information of the material according to the moving speed of the material, and determine the second shape information of the material according to the ray absorption rates of the material at different positions in the target width direction; wherein, the first shape information and the second shape information include: circular and flaky.

[0070] In a possible implementation manner, the first shape information includes quasi-circular and flaky; correspondingly, determining the first shape information of the material according to the moving speed of the material includes: if the moving speed of the material is greater than or equal to the preset speed, the processing device determines that the first shape information of the material is circular; if the moving speed of the material is less than the preset speed, the processing device determines that the first shape information of the material is flaky.

[0071] In this embodiment, the value of the preset speed is not specifically limited and can be set and modified as needed. Optionally, the preset speed may be the demarcation speed between the circular material and the sheet-shaped material. Exemplarily, the preset speed may be any speed between 0.7 m / s and 1.9 m / s.

[0072] In a possible implementation manner, the second shape information of the material is determined according to the ray absorption rates at different positions of the material in the target width direction, including: the processing device determines the absolute value of the change rate of the ray absorption rates at different positions of the material in the target width direction, where the absolute value of the change rate of the ray absorption rate is the absolute value of the first-order derivative of the ray absorption rate in the target width direction; and the second shape information of the material is determined according to the absolute value of the change rate of the ray absorption rates at different positions of the material in the target width direction.

[0073] In the embodiments of the present disclosure, the ray absorption rates at different positions of the material in the target width direction are continuous and can be represented by a ray absorption rate curve.

[0074] Optionally, the ray absorption rate of the material at different positions in the target width direction is: Y = f(x); where Y represents the ray absorption rate and x represents the position of the material in the target width direction.

[0075] Exemplarily, the target width of the circular material is 60 mm, and the ray absorption rate curve of the circular material at different positions in the target width direction is as Figure 5 shown. Exemplarily, the target width of the sheet-shaped material is 60 mm, and the ray absorption rate curve of the sheet-shaped material at different positions in the target width direction is as Figure 6 shown.

[0076] In the embodiments of the present disclosure, the first-order derivative of the ray absorption rate in the target width direction is also continuous. At this time, the absolute value of the change rate of the ray absorption rate is continuous in the target width direction and can be represented by an absolute value curve of the change rate of the ray absorption rate. Exemplarily, the target width of the circular material is 60 mm, and the absolute value curve of the change rate of the ray absorption rate of the circular material at different positions in the target width direction is as Figure 7 shown. Exemplarily, the target width of the sheet-shaped material is 60 mm, and the absolute value curve of the change rate of the ray absorption rate of the sheet-shaped material at different positions in the target width direction is as Figure 8 shown.

[0077] It should be noted that since the change trends of the absolute values of the change rates of the ray absorption rates of the circular material and the sheet-shaped material at different positions in the target width direction are different, the second shape information of the material can be determined according to the change trend of the absolute value of the change rate of the ray absorption rate of the material at different positions in the target width direction.

[0078] In some embodiments, the second shape information of the material is determined according to the absolute value of the change rate of the ray absorption rate at different positions in the target width direction of the material, including: determining the first width from the starting position to the first position of the material in the target width direction according to the absolute value of the change rate of the ray absorption rate at different positions in the target width direction of the material, and determining the second width from the first position to the second position of the material in the target width direction, and determining the third width from the second position to the end position of the material in the target width direction; determining the second shape information of the material according to the first width, the second width, and the third width; wherein, the absolute value of the change rate of the ray absorption rate from the starting position to the first position is greater than or equal to a preset attenuation rate threshold, the absolute value of the change rate of the ray absorption rate from the first position to the second position is less than the preset attenuation rate threshold, and the absolute value of the change rate of the ray absorption rate from the second position to the end position is greater than or equal to the preset attenuation rate threshold.

[0079] Exemplarily, as Figure 7 and Figure 8 shown, the first width can be expressed as d1, the second width can be expressed as d2, and the third width can be expressed as d3. Among them, the absolute value of the change rate of the ray absorption rate from the starting position to the first position (within the range of d1) is greater than or equal to the preset attenuation rate threshold u. The absolute value of the change rate of the ray absorption rate from the first position to the second position (within the range of d2) is less than the preset attenuation rate threshold u. The absolute value of the change rate of the ray absorption rate from the second position to the end position (within the range of d3) is greater than or equal to the preset attenuation rate threshold.

[0080] In this embodiment, the value of the preset attenuation rate threshold is not specifically limited and can be set and modified as needed. Optionally, the preset attenuation rate threshold can be any attenuation rate between 0.43% / mm and 2% / mm.

[0081] In a possible implementation manner, the second shape information includes a quasi-circular shape and a flaky shape; correspondingly, determining the second shape information of the material according to the first width, the second width, and the third width includes: determining the sum of the first width and the third width, and determining the ratio of the second width to the sum of the first width and the third width; if the ratio is less than 1, determining that the result of the second shape information of the material is circular, and if the ratio is greater than or equal to 1, determining that the result of the second shape information of the material is flaky.

[0082] Among them, the sum of the first width and the third width is the width in the target width where the absolute value of the change rate of the ray absorption rate is greater than or equal to the preset attenuation rate threshold. Among them, the first width is the width in the target width where the absolute value of the change rate of the ray absorption rate is less than the preset attenuation rate threshold.

[0083] Exemplarily, the target width of the material is d, including: d1 + d2 + d3; wherein, the width with the absolute value of the change rate of the ray absorption rate less than the preset attenuation rate threshold is: the second width d2. The widths with the absolute value of the change rate of the ray absorption rate greater than or equal to the preset attenuation rate threshold are: the first width d1 and the third width d3. When the ratio d2 / (d1 + d3) of the second width (d2) to the sum of the first width and the third width (d1 + d3) is less than 1, it is determined that the second shape information result of the material is circular, and when it is greater than or equal to 1, it is determined that the second shape information result of the material is sheet-shaped.

[0084] Exemplarily, as Figure 7 shown, the target width d of the material is 60 mm. Among them, the first width d1 is 22.5 mm, the second width d2 is 10 mm, and the third width d3 is 27.5 mm. At this time, d2 / (d1 + d3) is 0.2 which is less than 1, so it is determined that the second shape information result of the material is circular.

[0085] Exemplarily, as Figure 8 shown, the target width d of the material is 60 mm. Among them, the first width d1 is 7 mm, the second width d2 is 32 mm, and the third width d3 is 21 mm. At this time, d2 / (d1 + d3) is 8 / 7 which is greater than 1, so it is determined that the second shape information result of the material is sheet-shaped.

[0086] S303. If the first shape information result is consistent with the second shape information result and both are circular, it is determined that the shape of the material is circular; if the first shape information result is consistent with the second shape information result and both are sheet-shaped, it is determined that the shape of the material is sheet-shaped; if the first shape information result is inconsistent with the second shape information result, it is determined that the shape of the material is quasi-circular.

[0087] Optionally, the shapes of the materials include circular, sheet-shaped and quasi-circular. In the embodiments of the present disclosure, the shape of the material can be determined according to the first shape information result and the second shape information result. By combining the first shape information determined by the movement speed and the second shape information determined by the ray absorption rate to determine the shape of the material, that is, when determining the shape of the material, the factors of the movement speed and the ray absorption rate in two dimensions are comprehensively considered, so the accuracy of the determined shape of the material can be improved.

[0088] S304. According to the shape of the material, determine the average ray absorption rate corresponding to the material, and according to the average ray absorption rate, determine the material type to which the material belongs.

[0089] In the embodiments of the present disclosure, the target width of the material can be corrected according to the shape of the material, and the average ray absorption rate corresponding to the material can be determined through the corrected width. Correspondingly, this step may include the following steps (1) to (3):

[0090] (1) Modify the target width of the material according to the shape of the material to obtain the corresponding modified width of the material.

[0091] Optionally, if the shape of the material is circular, determine that the corresponding modified width of the material is the sum of the first width, the second width, and the third width, that is, M = d1 + d2 + d3; where M represents the modified width, and d1, d2, and d3 represent the first width, the second width, and the third width respectively.

[0092] Optionally, if the shape of the material is sheet-shaped, determine that the corresponding modified width of the material is the sum of the first width and the third width, that is, M = d1 + d3; where M represents the modified width, and d1 and d3 represent the first width and the third width respectively.

[0093] Optionally, if the shape of the material is quasi-circular, determine that the corresponding modified width of the material is the sum of the first width, half of the second width, and the third width, that is, M = d1 + 0.5 * d2 + d3; where M represents the modified width, and d1, d2, and d3 represent the first width, the second width, and the third width respectively.

[0094] (2) Determine the unit ray absorption rate at different positions of the material in the target width direction according to the ratio of the ray absorption rate to the modified width at different positions of the material in the target width direction.

[0095] Optionally, this step is: Determine the ratio of the ray absorption rate to the modified width at different positions of the material in the target width direction as the unit ray absorption rate at different positions of the material in the target width direction.

[0096] Exemplarily, the ray absorption rate at different positions of the material in the target width direction is: Y = f(x); where Y represents the ray absorption rate, and x represents the position of the material in the target width direction. At this time, the unit ray absorption rate at different positions of the material in the target width direction is: f(x) / M, where M represents the modified width. Among them, the ray absorption rate at different positions of the material in the target width direction is a continuous function. Correspondingly, the unit ray absorption rate at different positions of the material in the target width direction is also a continuous function.

[0097] (3) Determine the average ray absorption rate corresponding to the material as the average value of the unit ray absorption rates at different positions of the material in the target width direction.

[0098] Optionally, the unit ray absorption rate at different positions of the material in the target width direction is also a continuous function. At this time, the method for solving the average value of a continuous function can be used to determine the average value of the unit ray absorption rates at different positions of the material in the target width direction.

[0099] In a possible implementation, determining the material type to which the material belongs according to the average ray absorption rate includes: if the average ray absorption rate is greater than or equal to a preset ray absorption rate, the processing device determines that the material belongs to the first-density material; if the average ray absorption rate is less than the preset ray absorption rate, the processing device determines that the material belongs to the second-density material, where the density of the first-density material is greater than the density of the second-density material.

[0100] Exemplarily, the first-density material is a high-density material (for example, gangue), and the second-density material is a low-density material (for example, coal). In this embodiment, the value of the preset ray absorption rate is not specifically limited and can be set and modified as needed.

[0101] Optionally, the preset ray absorption rate can be determined through experiments. For example, the material to be identified can be used to separate the high-density material and the low-density material by floating and sinking, and the average ray absorption rates of the high-density material and the low-density material are respectively obtained by feeding them into the lump coal detection device, and the minimum coincidence critical value of the average ray absorption rates of the two high- and low-density material groups is set as k. When the average ray absorption rate of the material is less than the k value, the material is determined to be a low-density material; when it is greater than the k value, the material is determined to be a high-density material.

[0102] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include known common knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and embodiments are only regarded as exemplary, and the true scope and spirit of the present application are pointed out by the claims.

[0103] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A detection device for a material, characterized in that, Including: A feeder, a coal quality detection channel, a material identification device, and a processing device; The feeder is used to convey the material to be detected to the entrance of the coal quality detection channel; the coal quality detection channel is inclined so that the material passes through the coal quality detection channel by gravity; The material identification device includes an X-ray source and a linear array detector arranged on both sides of the coal quality detection channel. The material identification device is used to detect the moving speed of the material passing through the coal quality detection channel and the ray absorption rate of the material at different positions in the target width direction; wherein, the target width is the maximum projection width of the material projected on the coal quality detection channel and perpendicular to the moving direction; The processing device is used to determine the first shape information of the material according to the moving speed of the material, and determine the second shape information of the material according to the ray absorption rate of the material at different positions in the target width direction; wherein, the first shape information and the second shape information include: circular and sheet-shaped; if the results of the first shape information and the second shape information are consistent and both are circular, it is determined that the shape of the material is circular; if the results of the first shape information and the second shape information are consistent and both are sheet-shaped, it is determined that the shape of the material is sheet-shaped; if the results of the first shape information and the second shape information are inconsistent, it is determined that the shape of the material is oval-shaped; according to the shape of the material, determine the corresponding average ray absorption rate of the material, and determine the material type to which the material belongs according to the average ray absorption rate.

2. The inspection device for materials according to claim 1, characterized in that, The coal quality detection channel in the material detection device is inclined at a preset angle with the horizontal direction; wherein, the range of the preset angle is: greater than or equal to 30 degrees and less than or equal to 75 degrees.

3. A detection method for a material, characterized in that, Applied to the material detection device according to any one of claims 1-2, the method includes: Obtain the moving speed of the material passing through the coal quality detection channel and the ray absorption rate of the material at different positions in the target width direction; the target width is the maximum projection width of the material projected on the coal quality detection channel and perpendicular to the moving direction; Determine the first shape information of the material according to the moving speed of the material, and determine the second shape information of the material according to the ray absorption rate of the material at different positions in the target width direction; wherein, the first shape information and the second shape information include: circular and sheet-shaped; If the results of the first shape information and the second shape information are consistent and both are circular, it is determined that the shape of the material is circular; if the results of the first shape information and the second shape information are consistent and both are sheet-shaped, it is determined that the shape of the material is sheet-shaped; if the results of the first shape information and the second shape information are inconsistent, it is determined that the shape of the material is oval-shaped; Determine the corresponding average ray absorption rate of the material according to the shape of the material, and determine the material type to which the material belongs according to the average ray absorption rate.

4. The detection method according to claim 3, wherein The determining the first shape information of the material according to the moving speed of the material includes: If the moving speed of the material is greater than or equal to the preset speed, determine that the first shape information of the material is circular; if the moving speed of the material is less than the preset speed, determine that the first shape information of the material is sheet-shaped.

5. The detection method according to claim 4, wherein The determining the second shape information of the material according to the ray absorption rates of the material at different positions in the target width direction includes: According to the ray absorption rates of the material at different positions in the target width direction, determine the absolute value of the change rate of the ray absorption rates of the material at different positions in the target width direction, where the absolute value of the change rate of the ray absorption rates is the absolute value of the first derivative of the ray absorption rate in the target width direction; According to the absolute value of the change rate of the ray absorption rates of the material at different positions in the target width direction, determine the second shape information of the material.

6. The detection method according to claim 5, wherein The determining the second shape information of the material according to the absolute value of the change rate of the ray absorption rates of the material at different positions in the target width direction includes: According to the absolute value of the change rate of the ray absorption rates of the material at different positions in the target width direction, determine the first width from the starting position to the first position of the material in the target width direction, and determine the second width from the first position to the second position of the material in the target width direction, and determine the third width from the second position to the end position of the material in the target width direction; According to the first width, the second width, and the third width, determine the second shape information of the material; Wherein, the absolute value of the change rate of the ray absorption rate from the starting position to the first position is greater than or equal to the preset attenuation rate threshold, the absolute value of the change rate of the ray absorption rate from the first position to the second position is less than the preset attenuation rate threshold, and the absolute value of the change rate of the ray absorption rate from the second position to the end position is greater than or equal to the preset attenuation rate threshold.

7. The detection method according to claim 6, characterized in that, The determining the second shape information of the material according to the first width, the second width, and the third width includes: Determine the sum of the first width and the third width, and determine the ratio of the second width to the sum of the first width and the third width; If the ratio is less than 1, determine that the result of the second shape information of the material is circular, and if the ratio is greater than or equal to 1, determine that the result of the second shape information of the material is sheet-shaped.

8. The detection method according to claim 3, characterized in that The target width includes the first width, the second width, and the third width. The absolute value of the change rate of the ray absorption rate from the starting position to the first position of the material in the target width direction is greater than or equal to the preset attenuation rate threshold, the absolute value of the change rate of the ray absorption rate from the first position to the second position is less than the preset attenuation rate threshold, and the absolute value of the change rate of the ray absorption rate from the second position to the end position of the material in the target width direction is greater than or equal to the preset attenuation rate threshold; Correspondingly, the determining the average ray absorption rate corresponding to the material according to the shape of the material includes; According to the shape of the material, correct the target width of the material to obtain the corrected width corresponding to the material; Determine the unit ray absorption rate of the material at different positions in the target width direction according to the ratio of the ray absorption rate of the material at different positions in the target width direction to the corrected width; Determine the average ray absorption rate corresponding to the material as the average value of the unit ray absorption rates of the material at different positions in the target width direction.

9. The detection method according to claim 8, wherein The correcting the target width of the material according to the shape of the material to obtain the corrected width corresponding to the material includes: If the shape of the material is circular, determine that the corrected width corresponding to the material is the sum of the first width, the second width, and the third width; If the shape of the material is sheet-shaped, determine that the corrected width corresponding to the material is the sum of the first width and the third width; If the shape of the material is quasi-circular, determine that the corrected width corresponding to the material is the sum of the first width, half of the second width, and the third width.

10. The detection method according to claim 3, wherein, The determining the material type to which the material belongs according to the average ray absorption rate includes: If the average ray absorption rate is greater than or equal to the preset ray absorption rate, determine that the material belongs to the first density material; if the average ray absorption rate is less than the preset ray absorption rate, determine that the material belongs to the second density material; wherein the density of the first density material is greater than the density of the second density material.

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