Bolt looseness detection method and device based on magnetic separator and magnetic separator

Abstract

The invention provides a bolt looseness detection method and device based on a magnetic separator and the magnetic separator, a row-column coordinate system is established according to the distribution information of each bolt of the magnetic separator, and each bolt and the detection information of a detector for collecting the bolt state are uniformly mapped into the row-column coordinate system, so that the detection information can be in one-to-one correspondence with each bolt, and the bolt looseness detection accuracy is improved. The bolt state detection information of each bolt can be conveniently obtained during operation of the magnetic separator, whether each bolt is loosened or not can be judged according to the bolt state detection information, and the loosening risk of each bolt can be obtained according to historical data of the bolt state detection information. According to the bolt looseness detection method and device based on the magnetic separator and the magnetic separator, looseness detection of the magnetic medium fixing bolt can be achieved in the operation process of the magnetic separator, the looseness problem can be found in time conveniently, the operation reliability of the magnetic separator is guaranteed, the influence of shutdown detection on production can be avoided, automation can be achieved, the manual workload is reduced, and the production efficiency is improved. And the detection efficiency is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic separators, and particularly relates to a method and device for detecting bolt loosening based on a magnetic separator, and a magnetic separator. Background Art

[0002] Magnetic separators are usually used in environments such as mines and ore dressing plants to screen out magnetic ore particles and non-magnetic ore particles. They have high separation efficiency and high purity, and are widely used.

[0003] The sorting structure of a magnetic separator includes a circular rotating component, on which magnetic media for forming an electromagnet are arranged in a surrounding manner, and the magnetic media are fixed to the circular rotating component by bolts. Similar to various automated mechanical equipment, vibrations will also occur during the operation of the magnetic separator. Affected by the vibrations, over time, the fixing bolts of the magnetic media will loosen and fall off. Once a bolt falls off, the corresponding magnetic medium will drop and jam the magnetic separator. Therefore, in the prior art, it is necessary to regularly stop the machine to detect whether the fixing bolts of the magnetic media are loose to ensure the working reliability of the magnetic separator. However, stopping the machine will reduce production efficiency, and in the prior art, it is mainly detected manually. Corresponding to the number of magnetic media, the number of its fixing bolts is numerous, and the detection is time-consuming and laborious, with low detection efficiency. Summary of the Invention

[0004] Based on this, the object of the present invention is to provide a method and device for detecting bolt loosening based on a magnetic separator, and a magnetic separator, so as to solve the problems in the prior art that the detection efficiency of the loosening of the fixing bolts of the magnetic media of the magnetic separator is low, and the detection requires production suspension, which reduces production efficiency.

[0005] On the one hand, the present invention provides a method for detecting bolt loosening based on a magnetic separator, including:

[0006] Establish a row-column coordinate system according to the distribution information of each bolt of the target magnetic separator, and map each bolt to the row-column coordinate system;

[0007] Collect the detection position coordinate information of the bolt status detector in the row-column coordinate system, and the detection information of the bolt status detector, so as to map the detection information to the row-column coordinate system according to the detection position coordinate information;

[0008] Obtain the bolt status detection information of each bolt according to the mapping information of each bolt in the row-column coordinate system and the mapping information of the detection information in the row-column coordinate system;

[0009] Judge whether each bolt is loose according to the bolt status detection information, and obtain the loosening risk of each bolt according to the historical data of the bolt status detection information, and report the coordinate information of the loose bolts and the bolts with loosening risk.

[0010] Optionally, it further includes:

[0011] According to the mapping information of each bolt in the row-column coordinate system, a plurality of recognition units are divided in the row-column coordinate system. The number of the recognition units is the same as the number of bolts, and each bolt is located at the center position of the corresponding recognition unit;

[0012] The recognition unit is divided into a core area and a peripheral area according to the size of the bolt, and the size of the core area is the same as the size of the bolt;

[0013] The detection information corresponding to the core area is used as the bolt state detection information, and the detection information corresponding to the peripheral area is used as the environmental state information;

[0014] A state compensation amount is obtained according to the environmental state information, and the corresponding bolt state detection information is compensated and corrected according to the state compensation amount, so as to judge the looseness of the bolt and obtain the looseness risk according to the compensated and corrected bolt state detection information.

[0015] Optionally, the step of obtaining the state compensation amount according to the environmental state information includes:

[0016] The peak-to-peak values of each point in the peripheral area are obtained according to the environmental state information, and the compensated peak-to-peak value of the corresponding core area is obtained according to the change trend of the peak-to-peak values in the direction from the edge to the center of the peripheral area, so as to obtain the peak compensation amount and the valley compensation amount in the state compensation amount according to the compensated peak-to-peak value;

[0017] Among them, the step of compensating and correcting the corresponding bolt state detection information according to the state compensation amount includes: reducing the peak value and the valley value of the bolt state detection information according to the peak compensation amount and the valley compensation amount, so as to obtain the compensated and corrected bolt state detection information.

[0018] Optionally, the steps of judging the looseness of the bolt and obtaining the looseness risk according to the compensated and corrected bolt state detection information include:

[0019] The center position of the target bolt is obtained according to the peak value and the valley value of the compensated and corrected bolt state detection information;

[0020] The change amount of the center position of the target bolt is obtained according to the center positions obtained by two consecutive detections. When the change amount of the center position exceeds a preset first change amount threshold, it is judged that the target bolt is loose.

[0021] Optionally, the steps of judging the looseness of the bolt and obtaining the looseness risk according to the compensated and corrected bolt state detection information further include:

[0022] Obtain the central position of the target bolt based on the peak and valley values of the bolt status detection information after compensation correction;

[0023] Obtain the total central position change amount of the target bolt based on the historical information of the central position. When the total central position change amount exceeds the preset second change amount threshold, it is determined that the target bolt is loose.

[0024] Optionally, the steps of determining the looseness of the bolt and obtaining the looseness risk based on the bolt status detection information after compensation correction further include:

[0025] Obtain the central position prediction curve of the target bolt based on the historical information of the central position, and obtain the next total central position change amount of the target bolt in the current working cycle of the target magnetic separator according to the central position prediction curve. When the next total central position change amount exceeds the preset second change amount threshold, it is determined that the target bolt has a looseness risk.

[0026] Another aspect of the present invention provides a bolt looseness detection device based on a magnetic separator, including:

[0027] An encoder, arranged on the target magnetic separator and coaxially assembled with the target magnetic separator, the encoder is used to provide row coordinate information;

[0028] A sliding module, arranged outside the target magnetic separator, and the extending direction is consistent with the axial direction of the target magnetic separator. The sliding controller of the sliding module is further used to provide column coordinate information according to the position of the movable part;

[0029] A bolt status detector, slidably arranged on the movable part of the sliding module, and used to collect the detection information of the magnetic medium fixing bolt status of the target magnetic separator;

[0030] A main controller, fixedly arranged on the fixed part of the target magnetic separator and connected to the encoder, the sliding controller and the bolt status detector to obtain the row coordinate information, the column coordinate information and the detection information;

[0031] Wherein, the row coordinate information and the column coordinate information are consistent with the bolt distribution information of the target magnetic separator, and the main controller is further used to determine whether each bolt is loose according to the row coordinate information, the column coordinate information and the detection information.

[0032] Optionally, the main controller is further used to obtain the status of each magnetic medium fixing bolt of the target magnetic separator according to the above-mentioned bolt looseness detection method based on the magnetic separator, so as to give an alarm indication when there is a bolt looseness or a looseness risk, and provide the coordinate information of the corresponding bolt.

[0033] The present invention also provides a magnetic separator, which includes the bolt loosening detection device based on the magnetic separator as described above.

[0034] The bolt loosening detection method based on the magnetic separator provided by the present invention establishes a row-column coordinate system according to the distribution information of each bolt of the target magnetic separator, and maps the detection information of each bolt and the bolt state detector to the row-column coordinate system uniformly, so that the detection information can be corresponding to each bolt one by one, which is convenient to obtain the bolt state detection information of each bolt during the operation of the magnetic separator. According to the bolt state detection information, it can be judged whether each bolt is loose, and the loosening risk of each bolt can be obtained according to the historical data of the bolt state detection information. The bolt loosening detection method based on the magnetic separator provided by the present invention can realize the loosening detection of the magnetic medium fixing bolts during the operation of the magnetic separator, which is convenient to timely discover the loosening problem, ensure the operation reliability of the magnetic separator, avoid the influence of shutdown detection on production, and can be realized automatically, reduce the manual workload, and effectively improve the detection efficiency. Description of the Drawings

[0035] Figure 1 It is a schematic structural diagram of the bolt loosening detection device based on the magnetic separator in the application state in the embodiment of the present invention;

[0036] Figure 2 It is a partial structural diagram of a magnetic separator applicable to the bolt loosening detection device based on the magnetic separator in the embodiment of the present invention;

[0037] Figure 3 It is a partial structural diagram of the bolt loosening detection device based on the magnetic separator in the embodiment of the present invention;

[0038] Figure 4 It is a main flow schematic diagram of the bolt loosening detection method based on the magnetic separator in the embodiment of the present invention;

[0039] Figure 5 It is a schematic diagram of the principle of a partial processing method in the bolt loosening detection method based on the magnetic separator in the embodiment of the present invention.

[0040] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific Embodiments

[0041] For the convenience of understanding the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0042] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0044] To solve the problems in the prior art that the detection efficiency of the loosening of the magnetic medium fixing bolts of the magnetic separator is low and the detection requires production suspension, which reduces the production efficiency. The present invention provides a method for detecting bolt loosening based on a magnetic separator. It establishes a row-column coordinate system according to the distribution information of each bolt of the target magnetic separator, and uniformly maps the detection information of each bolt and the bolt state detector to the row-column coordinate system, so that the detection information can be corresponding to each bolt one by one, which is convenient to obtain the bolt state detection information of each bolt during the operation of the magnetic separator. According to the bolt state detection information, it can be judged whether each bolt is loose, and, according to the historical data of the bolt state detection information, the loosening risk of each bolt can be obtained. The loosening detection of the magnetic medium fixing bolts can be realized during the operation of the magnetic separator, which is convenient to timely discover the loosening problem, ensure the operation reliability of the magnetic separator, can avoid the influence of shutdown detection on production, and can be automated to reduce the manual workload and effectively improve the detection efficiency.

[0045] Specifically, as Figure 1 and Figure 2 shown, a protective cover 4 is provided on the sorting ring 1 of the magnetic separator, and an information acquisition system 2 is provided on the protective cover. The information acquisition system 2 is used to acquire detection information for bolt loosening analysis according to the detection information.

[0046] The sorting ring 1 is provided with a plurality of ring plates 1-1, and the ring plates 1-1 are stacked at intervals to form a plurality of annular installation spaces therebetween. Partition plates 1-2 are fixedly arranged in each annular installation space, and the partition plates 1-2 are arranged around at intervals. The magnetic medium 3 is arranged between adjacent partition plates 1-2, and a plurality of magnetic media 2 are arranged side by side. Both ends of each magnetic medium 2 are fixed to adjacent partition plates 1-2 by bolts. Between adjacent annular installation spaces, the arranged partition plates 1-2 are also arranged staggeredly to improve the coverage of the magnetic medium 3. The ring plate 1-1 is fixed to the hub 1-3 through a spoke plate 1-4 to be connected to the drive shaft through the hub 1-3 and rotate under the drive of the drive shaft.

[0047] The magnetic medium 3 is associated with an exciting coil (not shown in the figure). When an exciting current is passed through the exciting coil, the magnetic medium 3 can be magnetized to provide a magnetic field. When the magnetic separator is operating, the pulp flows through the sorting ring 1, and the magnetic minerals are adsorbed on the magnetic medium 3, while the weakly magnetic minerals pass through smoothly and are sent into the weakly magnetic product hopper. When the magnetic minerals adsorbed on the magnetic medium 3 accumulate to a certain amount, the input of the pulp is stopped, and at the same time, the exciting current is cut off, the magnetic field is turned off, and the flushing liquid is input to send the magnetic minerals into the magnetic product hopper.

[0048] It can be understood that this application is mainly used for detecting the looseness and detachment of bolts arranged on the outer surface of a ring-shaped rotating component, and is applicable to magnetic separators with such bolt configurations, not limited to the magnetic separator in this embodiment.

[0049] The protective cover 4 is mainly used to prevent external sundries from falling onto the sorting ring 1 to ensure the reliability of the detection information collected by the information collection system 2. The protective cover 4 can be fixed on the fixed part of the magnetic separator, such as a base, a fixing frame, etc., and remains stationary when the sorting ring 1 rotates.

[0050] An encoder is also arranged on the fixed part of the magnetic separator and is coaxially assembled with the magnetic separator so that the moving part of the encoder rotates synchronously with the sorting ring 1 of the magnetic separator, and the rotation angle of the sorting ring 1 can be obtained through the encoder. The encoder can also be arranged, for example, on the drive motor of the sorting ring 1.

[0051] Taking the circumferential direction of the sorting ring 1 as the row coordinate direction and the axial direction as the column coordinate direction, any zero point is calibrated. Combining with the bolt distribution positions, a row-column coordinate system can be constructed. The length of the row interval is consistent with the outer circumference of the installation position of the partition plate 1-2, and the length of the column interval is consistent with the span of the ring plate 1-1. The positions of each bolt in this row-column coordinate system can be confirmed.

[0052] The position of the information collection system 2 is fixed in the circumferential direction. As the sorting ring 1 rotates, its detection position changes synchronously. Combining with the output information of the encoder, the row coordinate of its detection position in the row-column coordinate system can be confirmed.

[0053] The information collection system 2 includes a sliding module, a bolt state detector 2-3, and a main controller 2-1. As Figure 3 shown, the sliding module includes a guide rail, on which a slider is arranged, and its sliding controller is communicatively connected with the main controller 2-1 (not shown in the figure) to control the movement of the slider on the guide rail through the main controller 2-1.

[0054] In the column direction, the setting intervals of the bolts are relatively standard. The sliding controller can select a servo motor, a stepping motor, etc. combined with a rotating component to achieve the linear drive of the slider. The guide rail of the sliding module is, for example, a grating guide rail, and the grating guide rail can provide accurate position information of the slider thereon as the column coordinate of the slider, with guaranteed accuracy.

[0055] The bolt status detector 2-3 is fixedly arranged on the slider of the sliding module. The data transceiver 2-2 is communicatively connected to the bolt status detector 2-3 and the sliding module, and can synchronously obtain the detection information of the bolt status detector 2-3 and the corresponding column coordinates, and upload them to the main controller 2-1. Combining with the row coordinates obtained from the encoder, bolt loosening detection is performed.

[0056] The bolt status detector 2-3 includes, for example, a laser scanning sensor, and realizes non-contact detection by using laser interference method, laser ultrasonic technology, etc.

[0057] The detection information collected by the bolt status detector 2-3 may include all the information on the outer surface of the circumferential side of the sorting ring 1, including bolt status detection information and other surface status detection information, which can be distinguished by bolt coordinates and bolt size information, so as to extract the bolt status detection information accurately corresponding to the bolt from it.

[0058] The bolt loosening detection method of the magnetic separator provided by the present invention is mainly applied in the main controller 2-1, as Figure 4 shown, and specifically includes:

[0059] Step S01: Establish a row-column coordinate system according to the distribution information of each bolt of the target magnetic separator, and map each bolt into the row-column coordinate system;

[0060] Step S02: Collect the detection position coordinate information of the bolt status detector in the row-column coordinate system, and the detection information of the bolt status detector, so as to map the detection information into the row-column coordinate system according to the detection position coordinate information;

[0061] Step S03: Obtain the bolt status detection information of each bolt according to the mapping information of each bolt in the row-column coordinate system and the mapping information of the detection information in the row-column coordinate system;

[0062] Step S04: Judge whether each bolt is loose according to the bolt status detection information, and obtain the loosening risk of each bolt according to the historical data of the bolt status detection information, and report the coordinate information of the loose bolts and the bolts with loosening risk.

[0063] In step S01, the row-column coordinate system is mainly obtained based on data such as the circumference of the arrangement circle of the bolts in the sorting ring, the number of bolts, the spacing, etc. The basic unit length of the row and column can be determined respectively according to the spacing of the bolts in the row and column directions, which is convenient for coordinate mapping and data processing.

[0064] In this embodiment, the bolt status detector in step S02 mainly detects in real time during the operation of the magnetic separator. During the operation of the magnetic separator, its vibration condition can cause the loose bolts to jump. According to the jumping characteristics, the identification of bolt loosening can be carried out. The collected data mainly reflects the distance between the bolt and the bolt status detector. When the bolt is loose, the distance data will show large fluctuations.

[0065] To avoid the interference of the overall vibration of the sorting ring caused by the vibration condition on the detection result, please further refer to Figure 5 , in this embodiment, it further includes:

[0066] According to the mapping information of each bolt in the row-column coordinate system, a plurality of identification units 310 are divided in the row-column coordinate system. The number of identification units 310 is the same as the number of bolts 31, and each bolt 31 is located at the center position of the corresponding identification unit 310; according to the size of the bolt 31, the identification unit 310 is divided into a core area 311 and a peripheral area 312, and the size of the core area 311 is the same as the size of the bolt 31. Among them, the identification units 310 can cover the row-column coordinate system, or the row-column size is smaller than the row-column spacing of adjacent bolts 31, and on the unfolded surface of the fixing surface of the bolt 31, the relative displacement of the bolt status detector is linear, and the formed detection line L1 generally aligns with the center line of the corresponding row of bolts. Correspondingly, the core area 311 and the peripheral area 312 are mainly on this detection line L1. The actual areas of the identification unit 310, the core area 311, and the peripheral area 312 can be determined according to the detection surface size of the bolt status detector and the specific requirements of data processing.

[0067] According to the division of the core area 311 and the peripheral area 312, the detection information corresponding to the core area 311 can be used as the bolt status detection information, and the detection information corresponding to the peripheral area 312 can be used as the environmental status information;

[0068] Obtain the status compensation amount according to the environmental status information, and compensate and correct the corresponding bolt status detection information according to the status compensation amount to eliminate the jitter interference caused by the vibration condition, so that the detection result of judging the bolt loosening and obtaining the loosening risk according to the compensated and corrected bolt status detection information is more accurate.

[0069] Specifically, the step of obtaining the status compensation amount according to the environmental status information includes:

[0070] Obtain the peak-to-peak value of each point in the peripheral area according to the environmental status information, and obtain the compensated peak-to-peak value of the corresponding core area according to the change trend of the peak-to-peak value in the direction from the edge to the center of the peripheral area (for example, it can be obtained by fitting with a binomial function), so as to obtain the peak compensation amount and the valley compensation amount in the status compensation amount according to the compensated peak-to-peak value;

[0071] Among them, the step of compensating and correcting the corresponding bolt state detection information according to the state compensation amount includes: reducing the peak value and the valley value of the bolt state detection information according to the peak compensation amount and the valley compensation amount, so as to obtain the compensated and corrected bolt state detection information.

[0072] In an optional embodiment, the steps of judging the looseness of the bolt and obtaining the looseness risk according to the compensated and corrected bolt state detection information include:

[0073] Obtaining the central position of the target bolt according to the peak value and the valley value of the compensated and corrected bolt state detection information; obtaining the central position change amount of the target bolt according to the central positions obtained from two consecutive detections, and when the central position change amount exceeds a preset first change amount threshold, judging that the target bolt is loose.

[0074] Among them, the central position of the target bolt is the average value of the peak value and the valley value in its bolt state detection information, and the first change amount threshold corresponds to the single central position change amount when the bolt has become loose, and the specific data can be calibrated according to the specific situation.

[0075] To improve the reliability of looseness detection, in this embodiment, the steps of judging the looseness of the bolt and obtaining the looseness risk according to the compensated and corrected bolt state detection information further include:

[0076] Obtaining the central position of the target bolt according to the peak value and the valley value of the compensated and corrected bolt state detection information; obtaining the total central position change amount of the target bolt according to the historical information of the central position, and when the total central position change amount exceeds a preset second change amount threshold, judging that the target bolt is loose.

[0077] Through the total central position change amount, the cumulative central position change amount of the target bolt during a single startup operation can be obtained, so as to realize the global bolt looseness detection. The second change amount threshold can be calibrated according to the bolt looseness limit in actual applications.

[0078] To avoid the bolt from becoming loose and falling off during the interval between two detections, in this embodiment, the steps of judging the looseness of the bolt and obtaining the looseness risk according to the compensated and corrected bolt state detection information further include:

[0079] Obtaining the central position prediction curve of the target bolt according to the historical information of the central position, and obtaining the next total central position change amount of the target bolt in the current working cycle of the target magnetic separator according to the central position prediction curve, and when the next total central position change amount exceeds a preset second change amount threshold, judging that the target bolt has a looseness risk.

[0080] By means of the single center position change amount when the bolt has become loose, the cumulative center position change amount during a single startup operation, and the prediction of the cumulative change amount, it is possible to effectively cope with the sudden loosening, cumulative loosening of the bolt, and the prediction of the cumulative loosening, improve the response efficiency to the bolt loosening risk, reduce the impact of the bolt loosening on the operation of the magnetic separator, and improve the working reliability of the magnetic separator.

[0081] When it is detected that the bolt is loose or has become loose, or the bolt has a risk of loosening or becoming loose, the main controller 21 can send a shutdown instruction to the host computer to control the magnetic separator to shut down, and at the same time report the coordinates of the risky bolt so as to manually eliminate the loosening or becoming loose problem.

[0082] Among them, predicting the loosening or becoming loose risk of the bolt through historical information can reduce the demand for real-time data processing capabilities, lower the functional requirements for the data processor, and reduce the data processing cost.

[0083] The present invention also provides a magnetic separator, including the above-mentioned bolt loosening detection device based on the magnetic separator, which can automatically and real-time detect the fastening state of the magnetic medium fixing bolts during the operation of the magnetic separator. When the bolt becomes loose or has become loose, or there is a risk of loosening or becoming loose, it can shut down in time and report the position of the risky bolt, which is convenient for quickly eliminating the problem, and there is no need to shut down during the detection, which can effectively improve the production efficiency.

[0084] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0085] The above-mentioned embodiments only represent several specific implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A method for detecting bolt looseness based on a magnetic separator, characterized in that Including: Establish a row-column coordinate system according to the distribution information of each bolt of the target magnetic separator, and map each bolt into the row-column coordinate system; Collect the detection position coordinate information of the bolt status detector in the row-column coordinate system and the detection information of the bolt status detector, so as to map the detection information into the row-column coordinate system according to the detection position coordinate information; Obtain the bolt status detection information of each bolt according to the mapping information of each bolt in the row-column coordinate system and the mapping information of the detection information in the row-column coordinate system; Judge whether each bolt is loose according to the bolt status detection information, and obtain the loosening risk of each bolt according to the historical data of the bolt status detection information, and report the coordinate information of the loose bolts and the bolts with loosening risk.

2. The bolt loosening detection method based on a magnetic separator according to claim 1, wherein Also including: Divide a plurality of recognition units in the row-column coordinate system according to the mapping information of each bolt. The number of the recognition units is the same as the number of bolts, and each bolt is located at the center position of the corresponding recognition unit; Divide the recognition unit into a core area and a peripheral area according to the size of the bolt, and the size of the core area is the same as the size of the bolt; Use the detection information corresponding to the core area as the bolt status detection information, and use the detection information corresponding to the peripheral area as the environmental status information; Obtain a state compensation amount according to the environmental status information, and perform compensation and correction on the corresponding bolt status detection information according to the state compensation amount, so as to judge the looseness of the bolt and obtain the loosening risk according to the compensated and corrected bolt status detection information.

3. The bolt loosening detection method based on a magnetic separator according to claim 2, characterized in that, The step of obtaining the state compensation amount according to the environmental status information includes: Obtain the peak-to-peak value of each point in the peripheral area according to the environmental status information, and obtain the compensated peak-to-peak value of the corresponding core area according to the change trend of the peak-to-peak value in the direction from the edge to the center of the peripheral area, so as to obtain the peak compensation amount and the valley compensation amount in the state compensation amount according to the compensated peak-to-peak value; Among them, the step of performing compensation and correction on the corresponding bolt status detection information according to the state compensation amount includes: reducing the peak value and the valley value of the bolt status detection information according to the peak compensation amount and the valley compensation amount to obtain the compensated and corrected bolt status detection information.

4. The method for detecting bolt loosening based on a magnetic separator according to claim 1 or 3, characterized in that, The steps of judging the looseness of the bolt and obtaining the loosening risk according to the compensated and corrected bolt status detection information include: Obtain the center position of the target bolt according to the peak value and the valley value of the compensated and corrected bolt status detection information; Obtain the change amount of the center position of the target bolt according to the center positions obtained by two consecutive detections. When the change amount of the center position exceeds a preset first change amount threshold, judge that the target bolt is loose.

5. The method for detecting bolt looseness based on a magnetic separator according to claim 1 or 3, characterized in that, The steps of judging the looseness of the bolt and obtaining the loosening risk according to the compensated and corrected bolt status detection information further include: Obtain the center position of the target bolt according to the peak value and the valley value of the compensated and corrected bolt status detection information; Obtain the total central position change amount of the target bolt according to the historical information of the central position, and determine that the target bolt is loose when the total central position change amount exceeds a preset second change amount threshold.

6. The method for detecting bolt loosening based on a magnetic separator according to claim 5, characterized in that, The steps of determining the looseness of the bolt and obtaining the looseness risk according to the bolt state detection information after compensation and correction further include: Obtain the central position prediction curve of the target bolt according to the historical information of the central position, and obtain the next total central position change amount of the target bolt in the current working cycle of the target magnetic separator according to the central position prediction curve. Determine that the target bolt has a risk of looseness when the next total central position change amount exceeds a preset second change amount threshold.

7. A bolt loosening detection device based on a magnetic separator, characterized in that, Include: An encoder, arranged on the target magnetic separator and coaxially assembled with the target magnetic separator, the encoder is used to provide row coordinate information; A sliding module, arranged outside the target magnetic separator, and the extending direction is consistent with the axial direction of the target magnetic separator. The sliding controller of the sliding module is also used to provide column coordinate information according to the position of the movable part; A bolt state detector, slidably arranged on the movable part of the sliding module, and used to collect the detection information of the magnetic medium fixing bolt state of the target magnetic separator; A main controller, fixedly arranged on the fixed part of the target magnetic separator, and connected to the encoder, the sliding controller and the bolt state detector to obtain the row coordinate information, the column coordinate information and the detection information; Wherein, the row coordinate information and the column coordinate information are consistent with the distribution information of each bolt of the target magnetic separator, and the main controller is also used to judge whether each bolt is loose according to the row coordinate information, the column coordinate information and the detection information.

8. The bolt loosening detection device based on a magnetic separator according to claim 7, characterized in that, The main controller is also used to obtain the states of the magnetic medium fixing bolts of the target magnetic separator according to the bolt looseness detection method based on the magnetic separator according to any one of claims 1 to 6, so as to give an alarm indication when there is a bolt looseness or a risk of looseness, and provide the coordinate information of the corresponding bolt.

9. A magnetic separator, characterized in that, Include the bolt looseness detection device based on the magnetic separator according to claim 7 or 8.

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