Equipment calibration method and system of ore sorting machine, medium and product

Abstract

The invention discloses an equipment calibration method and system of an ore sorting machine, a medium and a product, and the equipment calibration method comprises the following steps: determining a grade sorting threshold G% and a maximum thickness T-max according to the grade and the thickness of target ore, manufacturing a corresponding standard ore sample, and feeding the standard ore sample into an XRT ore sorting machine for imaging; adjusting the tube voltage to observe the imaging of the XRT ore sorting machine until the minimum tube voltage at which rays of the XRT ore sorting machine can penetrate through the standard ore sample is found; the tube voltage of the XRT ore sorting machine is set to be the minimum tube voltage, the standard ore samples are fed into the XRT ore sorting machine for imaging, and the tube current is adjusted until the minimum tube current at which rays of the XRT ore sorting machine can penetrate through all the positions of the standard ore samples is found. According to the method, the appropriate tube voltage and tube current are set according to the attributes of the target ore, so that the XRT sorting machine can obtain a good sorting effect, and meanwhile, the low radiation safety risk and the low power consumption cost are kept.

Description

Technical Field

[0001] The invention relates to an XRT ore sorter, and in particular to an equipment calibration method, system, medium and product of an ore sorter. Background Art

[0002] XRT ore sorting machine is a kind of equipment that uses X-ray to detect and sort ore. Figure 1 This is an example of an XRT image obtained by an XRT ore sorter. The tube voltage and tube current parameters in the XRT ore sorter directly affect the X-ray energy range generated by its X-ray tube, thereby directly and significantly affecting the performance of the XRT ore sorter. However, the setting of the tube voltage and tube current parameters needs to take into account multiple factors such as radiation safety, electricity costs, and sorting performance. At present, there is no scientific and standard setting method or process for determining these two parameters in the public inventions and literature. According to market research, the setting of these two parameters in the industry is more based on experience, and the setting process lacks specificity to the properties of the target ore. This unscientific parameter setting method can easily cause the performance of the XRT ore sorter to not be fully utilized, or cause unnecessary electricity costs and radiation problems. Summary of the invention

[0003] Technical problem to be solved by the present invention: In view of the above-mentioned problems in the prior art, an equipment calibration method, system, medium and product for an ore sorter are provided. The present invention aims to set appropriate tube voltage and tube current according to the properties of the target ore, so that the XRT sorter can obtain good sorting effect while maintaining low radiation safety risks and electricity costs.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: A method for calibrating an ore sorter comprises the following steps: S1, according to the type, grade and thickness distribution information of the target sorted ore, determine the target mineral element type, grade sorting threshold G%, and the maximum thickness T-max of the required sorted ore; S2, preparing multiple standard ore samples with target mineral element grade being the grade sorting threshold G% and thickness being the maximum thickness T-max; S3, sending a plurality of standard ore samples into an XRT ore sorter for imaging, and adjusting the tube voltage of the XRT ore sorter to observe the imaging of the XRT ore sorter until finding the minimum tube voltage at which the XRT ore sorter's rays can penetrate the standard ore samples; S4, setting the tube voltage of the XRT ore sorter to the minimum tube voltage, sending a plurality of standard ore samples into the XRT ore sorter for imaging, and adjusting the tube current of the XRT ore sorter to observe the imaging of the XRT ore sorter until finding the minimum tube current at which the XRT ore sorter's rays can penetrate each position of the standard ore samples.

[0005] Optionally, the grade sorting threshold G% in step S1 refers to a threshold for classifying ore into concentrate ore and waste ore, and ore with a grade greater than the grade sorting threshold G% is concentrate ore, otherwise it is waste ore.

[0006] Optionally, in step S2, when preparing multiple standard ore samples with a target mineral element grade of a grade sorting threshold value G% and a thickness of a maximum thickness T-max, the steps include selecting target mineral element powder particles and gangue powder particles of the ore in required proportions for grinding; after grinding, loading into a graphite mold according to the spatial distribution characteristics of the target ore, pressing into shape, and then sintering to obtain the required multiple standard ore samples.

[0007] Optionally, in step S3, the tube voltage of the XRT ore sorter is adjusted to observe the imaging of the XRT ore sorter until the function expression of the minimum tube voltage at which the rays of the XRT ore sorter can penetrate the standard ore sample is found: ， In the above formula, is the minimum tube voltage, is the tube voltage, is the number of standard ore samples, When the tube voltage is The XRT image of the standard ore sample The gray value of a pixel, is the preset gray value threshold.

[0008] Optionally, in step S3, the tube current of the XRT ore sorter is adjusted to observe the imaging of the XRT ore sorter until the function expression of the minimum tube current at which the XRT ore sorter's rays can penetrate each position of the standard ore sample is found: , In the above formula, is the minimum tube current, is the tube current, When the tube current is The average value of the gray value variance and the background variance of the XRT image of the standard ore sample is is the preset gray value variance threshold.

[0009] Optionally, the step of feeding the plurality of standard ore samples into the XRT ore sorter for imaging further includes adjusting the belt speed of the XRT ore sorter to a preset target speed. .

[0010] Optionally, after step S4, the process further includes setting the tube voltage of the XRT ore sorter to the minimum tube voltage, setting the tube current to the minimum tube current, and feeding the target ore into the XRT ore sorter for imaging sorting.

[0011] Optionally, when the target ore is fed into the XRT ore sorter for imaging sorting, the method further includes obtaining the belt speed of the XRT ore sorter after adjusting the belt speed of the XRT ore sorter for imaging sorting the target ore. , the belt speed Divide by target speed The adjustment coefficient is obtained, and the tube voltage of the XRT ore sorter is set to the product of the minimum tube voltage and the adjustment coefficient, and the tube current is set to the product of the minimum tube current and the adjustment coefficient.

[0012] In addition, the present invention also provides an equipment calibration system for an ore sorting machine, comprising a microprocessor and a memory connected to each other, wherein the microprocessor is programmed or configured to execute the equipment calibration method for the ore sorting machine.

[0013] In addition, the present invention also provides a computer-readable storage medium, in which a computer program or instruction is stored. The computer program or instruction is programmed or configured to execute the equipment calibration method of the ore sorting machine through a processor.

[0014] In addition, the present invention also provides a computer program product, comprising a computer program or instructions, which are programmed or configured to execute the equipment calibration method of the ore sorting machine through a processor.

[0015] Compared with the prior art, the present invention has the following advantages: In view of the fact that there is no standard and scientific setting method for the key parameters of the X-ray tube in the XRT ore sorter, namely the tube voltage and the tube current, the present invention designs an implementable scientific and standardized process to confirm the tube voltage and tube current parameters in the XRT ore sorter. According to the process proposed by the present invention, the appropriate tube voltage and tube current can be set according to the properties of the target ore, so that the XRT ore sorter can obtain a good sorting effect while maintaining a low radiation safety risk and electricity cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an example of an XRT image obtained by an XRT ore sorting machine in the prior art.

[0017] Figure 2 Schematic diagram of the basic flow of the method of the embodiment of the present invention.

[0018] Figure 3 This is an example of an XRT image of a standard ore sample in an embodiment of the present invention.

[0019] Figure 4 This is an example of an XRT image of a standard ore sample when the tube voltage is too low in an embodiment of the present invention.

[0020] Figure 5 This is an example of an XRT image of a standard ore sample when the tube current is too low in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The embodiments of the present invention will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention. In the description of the present invention, if there is a description of the first, the second, etc., it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features. If it involves the description of the orientation, such as the orientation or position relationship indicated by the upper and lower indications, the above-mentioned orientation description is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. Unless otherwise clearly defined, the terms such as setting, installing, connecting, etc. in the description of the present invention should be understood in a broad sense, and the technicians in the relevant technical field can reasonably determine the specific meaning of the above terms in the present invention in combination with the specific content of the technical solution.

[0022] like Figure 2 As shown, this embodiment provides an equipment calibration method for an ore sorting machine, comprising the following steps: S1, according to the type, grade and thickness distribution of the target sorting ore, determine the target mineral element type, grade sorting threshold G%, and the maximum thickness T-max of the ore to be sorted; for example, for the pre-waste task of a batch of copper ore, the target mineral element is copper (Cu); through sampling and testing, the grade distribution information of the batch of copper ore is found, and based on the data, the grade sorting threshold of the copper element is further determined to be 3%, which can make the sorting indicators (such as the waste rate and recovery rate of copper mineral elements) reach the expected target; through sampling and testing, the thickness distribution information of the batch of copper ore is found, and based on the data, the maximum thickness of the ore is further determined to be 6cm. The reason for preparing the standard ore sample according to the parameters is to obtain a standard sample of the most difficult ore to penetrate in the target sorting ore, so as to cooperate with the subsequent calibration and debugging of the tube current and tube voltage.

[0023] S2, prepare multiple standard ore samples with the target mineral element grade being the grade sorting threshold G% and the thickness being the maximum thickness T-max; for example, for the copper ore described in step S1, prepare a batch of cylindrical ore samples with a copper (Cu) grade of 3%, a thickness of 6 cm, and a radius of 3 cm. The size of the radius is not important, as long as the imaging area of ​​the sample under XRT detection is large enough. The preparation of the standard sample can be obtained by artificially proportioning the mineral powders of the target mineral and the gangue, and further by placing the mixed mineral powders into a mold and sintering them in an electric plasma sintering furnace; S3, sending a plurality of standard ore samples into an XRT ore sorter for imaging, and adjusting the tube voltage of the XRT ore sorter to observe the imaging of the XRT ore sorter until finding the minimum tube voltage at which the XRT ore sorter's rays can penetrate the standard ore samples; S4, setting the tube voltage of the XRT ore sorter to the minimum tube voltage, sending a plurality of standard ore samples into the XRT ore sorter for imaging, and adjusting the tube current of the XRT ore sorter to observe the imaging of the XRT ore sorter until finding the minimum tube current at which the XRT ore sorter's rays can penetrate each position of the standard ore samples.

[0024] The grade sorting threshold G% in step S1 of this embodiment refers to the threshold used to classify ore into concentrate ore and waste ore. The ore with a grade greater than the grade sorting threshold G% is the concentrate ore, otherwise it is the waste ore. In this embodiment, the thickness [T-min, T-max] of the target ore is [1cm, 6cm], that is, the maximum thickness T-max is 6cm.

[0025] In step S2 of this embodiment, it is necessary to prepare a standard ore sample. Due to the uncertainty of the grade of the raw ore, it is necessary to prepare a batch of standard ore samples with controllable grade and thickness. This batch of standard ore samples should include at least one "most difficult to penetrate sample", specifically a plurality of standard ore samples with a grade of the grade sorting threshold G% and a thickness of the maximum thickness T-max. It is best if multiple parallel samples can be prepared to reduce the system error. It is best if a batch of continuous samples with difficulty of penetration can be prepared (thickness between [T-min, T-max] or slightly exceeding the range, and grade between [0, G%] or slightly exceeding the range) to compare the imaging effect of ores of different grades and thicknesses. Specifically, when preparing a plurality of standard ore samples with a target mineral element grade of the grade sorting threshold G% and a thickness of the maximum thickness T-max in step S2 of this embodiment, the target mineral element powder particles and gangue powder particles of the ore of the required proportion are respectively selected for grinding; after the grinding is completed, they are loaded into a graphite mold according to the spatial distribution characteristics of the target ore for pressing and molding, and then sintered to obtain the required plurality of standard ore samples. Specifically, in this embodiment, more than three standard samples are prepared in parallel for each thickness and grade of ore, and a certain amount of target mineral element powder particles and gangue powder particles are weighed respectively. First, the powder materials are mixed and ground using an agate mortar, and GR ethanol solution is added during the grinding process to improve the grinding efficiency. The mixed powder suspension is placed in a tungsten carbide grinding tank, tungsten carbide balls are added, and ground in an MM400 planetary ball mill; after the ball milling, the uniformly mixed metal ore and gangue powder are loaded into a customized graphite mold and pre-pressed; the mold filled with the mixed powder is placed in a spark plasma sintering furnace for sintering, and the powder samples of different grades after the above grinding are used through the customized graphite mold to sinter and prepare ore standard samples with thickness and grade that meet the requirements. When the sorted ore has obvious spatial distribution characteristics (non-uniform distribution, such as vein ore), the sample preparation should simulate these distribution patterns as much as possible. Figure 3 This is an example of an XRT image of a standard ore sample in an embodiment of the present invention. The standard ore sample is specifically a lead ore with a thickness of 6 cm and a grade of 3%.

[0026] Since it is necessary to distinguish between ores with grades below and above G%, the X-rays of the XRT ore sorter should at least be able to penetrate the "most difficult to penetrate sample". The tube voltage determines the penetration ability of X-rays, so we first look for the "lowest tube voltage" value that can penetrate the "most difficult to penetrate sample". Specifically, we first adjust the ore movement speed (conveying belt speed) to a lower value so that a lower tube current, such as 2mA, can still fully irradiate the ore. Then, we adjust the tube voltage of the X-ray tube within a certain reasonable range, observe the XRT imaging of the "most difficult to penetrate sample" under different tube voltages, and determine whether it is penetrated. When the tube voltage is low, the X-ray energy is not enough to penetrate the sample, and the XRT imaging of the sample should be pure black (the average value is 0). Figure 4 This is an example of the XRT image of the standard ore sample when the tube voltage is too low in this embodiment. At this time, the tube voltage is too low, and the X-ray energy is insufficient to penetrate the standard ore sample, which is manifested as the grayscale average value of the standard ore sample is close to zero or the detector background noise intensity. When the tube voltage exceeds a certain value, the X-ray energy is sufficient to penetrate the sample. At this time, the XRT imaging of the sample gradually turns gray (the average value is greater than a certain threshold), proving that the sample is penetrated. The tube voltage at this time is the minimum tube voltage that can penetrate the "most difficult to penetrate sample". If the XRT ore sorter uses a tube voltage lower than the minimum tube voltage mentioned, it may cause the waste ore to be unable to be penetrated and it cannot be distinguished from the concentrate ore. However, excessively high tube voltage brings more radiation leakage risks and electricity costs, so the tube voltage of the XRT ore sorter can be set according to the minimum tube voltage, or slightly larger than the minimum tube voltage. Specifically, in step S3 of this embodiment, the tube voltage of the XRT ore sorter is adjusted to observe the imaging of the XRT ore sorter until the minimum tube voltage at which the rays of the XRT ore sorter can penetrate the standard ore sample is found. The function expression is: ， In the above formula, is the minimum tube voltage, is the tube voltage, is the number of standard ore samples, When the tube voltage is The XRT image of the standard ore sample The gray value of a pixel, is a preset grayscale value threshold, which has a value range of 0 to 255 and is generally a smaller value close to 0, for example, 20 in this embodiment.

[0027] After the tube voltage is confirmed, the setting of the tube current is equally important. The tube current determines the density of X-rays. Too low a tube current will result in insufficient X-ray exposure to the ore, resulting in many "noise points", resulting in poor signal-to-noise ratio of the XRT image, which is not conducive to accurate sorting. Generally, the size of the tube current should be proportional to the ore transportation speed, so we first adjust the belt movement speed to the ideal value or the expected maximum value. Then, we adjust the size of the tube current so that the signal-to-noise ratio of the ore flow is higher than a certain threshold. When the tube current is small, the X-ray density (flow) is low and not enough to evenly irradiate the sample. At this time, each point on the sample has a certain probability of not being detected by the X-ray, resulting in a large variance in the XRT imaging of the sample on different inspection batches. When the tube current exceeds a certain value, the X-ray density is large enough to evenly irradiate each point of the ore. At this time, the XRT imaging of the sample is relatively stable (the variance is less than a certain threshold), proving that the sample can be well detected. The tube current at this time is the minimum tube current that can "evenly irradiate the ore". If the XRT ore sorter uses a tube current lower than the minimum stated, the ore may not be penetrated evenly, and there will be more noise on the XRT display, reducing the sorting effect. Figure 5 This is an example of an XRT image of a standard ore sample when the tube current is too low in the embodiment. At this time, the tube current is too low and the X-ray dose is too little, resulting in poor contrast of the imaging, which is manifested as a high variance of the ore image. However, a tube current that is too high may overexpose the image and bring more radiation leakage risks and electricity costs. Therefore, the tube current of the XRT ore sorter can be set according to the minimum tube current, or slightly larger than the minimum tube current. Specifically, in step S3 of this embodiment, the tube current of the XRT ore sorter is adjusted to observe the imaging of the XRT ore sorter until the XRT ore sorter's rays can penetrate each position of the standard ore sample. The function expression is: , In the above formula, is the minimum tube current, is the tube current, When the tube current is The average value of the gray value variance and the background variance of the XRT image of the standard ore sample is is the preset gray value variance threshold. The setting of gray value variance threshold is related to the production process of standard samples. The more uniform the standard samples are, the lower the gray value variance threshold can be. .

[0028] In this embodiment, when a plurality of standard ore samples are fed into the XRT ore sorter for imaging, the belt speed of the XRT ore sorter is adjusted to a preset target speed. The purpose is to determine the belt speed corresponding to the minimum tube voltage and the minimum tube current, so as to dynamically adjust the minimum tube voltage and the minimum tube current according to the actual belt speed to meet the actual needs. For example, when the belt speed becomes half of the original, the tube current can also be appropriately reduced to half, that is, the tube current is scaled in proportion to the belt speed change.

[0029] After step S4, the present embodiment further includes setting the tube voltage of the XRT ore sorter to the minimum tube voltage, setting the tube current to the minimum tube current, and sending the target ore into the XRT ore sorter for imaging sorting.

[0030] In this embodiment, when the target ore is fed into the XRT ore sorter for imaging sorting, the belt speed of the XRT ore sorter is obtained after adjusting the belt speed of the XRT ore sorter for imaging sorting the target ore. , the belt speed Divide by target speed The adjustment coefficient is obtained, and the tube voltage of the XRT ore sorter is set to the product of the minimum tube voltage and the adjustment coefficient, and the tube current is set to the product of the minimum tube current and the adjustment coefficient.

[0031] In one embodiment, an XRT ore sorter is used for lead and zinc ore sorting. Before using the method of this embodiment, the tube voltage and tube current were set to 190kV, 12mA, and the power reached 2280W through manual experience on site. After using the method of this embodiment, the minimum configuration was 160kV, 6mA, the power dropped to 57.9%, and the radiation risk dropped by 84.3%. It is worth mentioning that the radiation risk is not linearly inversely proportional to the power: when the power drops to a certain level, most of the X-ray energy emitted is lower than the lead box used to penetrate the radiation, and the radiation leakage is almost zero at this time.

[0032] In summary, in view of the problem that there is currently no standard and scientific setting method for the key parameters of the X-ray tube in the XRT ore sorter, namely the tube voltage and tube current, the equipment calibration method of the ore sorter in this embodiment aims to design an implementable scientific and standardized process to confirm the tube voltage and tube current parameters in the XRT ore sorter. According to the process proposed by the method of this embodiment, the appropriate tube voltage and tube current can be set quickly, scientifically, standardly and targetedly according to the properties of the target ore, so that the XRT ore sorter can obtain good sorting effects while maintaining low radiation safety risks and electricity costs, and can also achieve dynamic adaptation of the belt speed.

[0033] In addition, this embodiment also provides an equipment calibration system for an ore sorting machine, comprising a microprocessor and a memory connected to each other, wherein the microprocessor is programmed or configured to execute the equipment calibration method for the ore sorting machine.

[0034] In addition, this embodiment also provides a computer-readable storage medium, in which a computer program or instruction is stored. The computer program or instruction is programmed or configured to execute the equipment calibration method of the ore sorting machine through a processor.

[0035] In addition, this embodiment also provides a computer program product, including a computer program or instructions, which are programmed or configured to execute the equipment calibration method of the ore sorting machine through a processor.

[0036] Those skilled in the art should understand that the technical solutions provided by the embodiments of the present application may be in the form of methods, systems, or computer program products. Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may take the form of a computer program product implemented on one or more computer-readable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the process Figure 1 A process or multiple processes and / or boxes Figure 1 These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing device to work in a specific way, so that the instructions stored in the computer-readable memory produce a product including an instruction device, which implements the functions specified in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide for implementing the process in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0037] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A method for calibrating an ore sorting machine, characterized in that: The steps include: S1, according to the type, grade and thickness distribution of the target ore to be sorted, determine the target mineral element type, grade sorting threshold G%, and the maximum thickness T-max of the ore to be sorted; S2, preparing multiple standard ore samples with target mineral element grade being the grade sorting threshold G% and thickness being the maximum thickness T-max; S3, sending a plurality of standard ore samples into an XRT ore sorter for imaging, and adjusting the tube voltage of the XRT ore sorter to observe the imaging of the XRT ore sorter until finding the minimum tube voltage at which the XRT ore sorter's rays can penetrate the standard ore samples; S4, setting the tube voltage of the XRT ore sorter to the minimum tube voltage, sending a plurality of standard ore samples into the XRT ore sorter for imaging, and adjusting the tube current of the XRT ore sorter to observe the imaging of the XRT ore sorter until finding the minimum tube current at which the XRT ore sorter's rays can penetrate each position of the standard ore samples.

2. The equipment calibration method of the ore sorting machine according to claim 1, characterized in that: The grade sorting threshold G% in step S1 refers to the threshold used to classify ore into concentrate ore and waste ore. The ore with a grade greater than the grade sorting threshold G% is the concentrate ore, otherwise it is the waste ore.

3. The equipment calibration method of the ore sorting machine according to claim 1, characterized in that: When preparing multiple standard ore samples with a target mineral element grade of the grade sorting threshold G% and a thickness of the maximum thickness T-max in step S2, the steps include selecting target mineral element powder particles and gangue powder particles of the ore in the required proportion for grinding; after grinding, loading them into a graphite mold according to the spatial distribution characteristics of the target ore, pressing and molding them, and then sintering them to obtain the required multiple standard ore samples.

4. The equipment calibration method of the ore sorting machine according to claim 1, characterized in that: In step S3, the tube voltage of the XRT ore sorter is adjusted to observe the imaging of the XRT ore sorter until the function expression of the minimum tube voltage at which the XRT ore sorter's rays can penetrate the standard ore sample is found: ， In the above formula, is the minimum tube voltage, is the tube voltage, is the number of standard ore samples, When the tube voltage is The XRT image of the standard ore sample The gray value of a pixel, is the preset gray value threshold.

5. The equipment calibration method of the ore sorting machine according to claim 1, characterized in that: In step S3, the tube current of the XRT ore sorter is adjusted to observe the imaging of the XRT ore sorter until the minimum tube current at which the XRT ore sorter's rays can penetrate each position of the standard ore sample is found. The function expression is: ， In the above formula, is the minimum tube current, is the tube current, When the tube current is The average value of the gray value variance and the background variance of the XRT image of the standard ore sample is is the preset gray value variance threshold.

6. The equipment calibration method of the ore sorting machine according to claim 1, characterized in that: The step of feeding a plurality of standard ore samples into the XRT ore sorter for imaging also includes adjusting the belt speed of the XRT ore sorter to a preset target speed. .

7. The equipment calibration method of the ore sorting machine according to claim 1, characterized in that: After step S4, the tube voltage of the XRT ore sorter is set to the minimum tube voltage, the tube current is set to the minimum tube current, and the target ore is sent to the XRT ore sorter for imaging sorting. When the target ore is sent to the XRT ore sorter for imaging sorting, the belt speed of the XRT ore sorter is obtained after adjusting the belt speed of the XRT ore sorter for imaging sorting the target ore. , the belt speed Divide by target speed The adjustment coefficient is obtained, and the tube voltage of the XRT ore sorter is set to the product of the minimum tube voltage and the adjustment coefficient, and the tube current is set to the product of the minimum tube current and the adjustment coefficient.

8. An equipment calibration system for an ore sorting machine, comprising a microprocessor and a memory connected to each other, characterized in that: The microprocessor is programmed or configured to execute the equipment calibration method of the ore sorting machine according to any one of claims 1 to 7.

9. A computer-readable storage medium having a computer program or instruction stored therein, characterized in that: The computer program or instruction is programmed or configured to execute the equipment calibration method of the ore sorting machine according to any one of claims 1 to 7 through a processor.

10. A computer program product comprising a computer program or instructions, characterized in that The computer program or instruction is programmed or configured to execute the equipment calibration method of the ore sorting machine according to any one of claims 1 to 7 through a processor.

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