Control system of electromagnetic hoisting equipment

Abstract

The invention belongs to the technical field of electromagnetic hoisting, and provides a control system of electromagnetic hoisting equipment, which comprises the following steps: acquiring parameter data of heavy metal to be hoisted, analyzing to obtain a load performance value based on the parameter data, obtaining a hoisting influence coefficient based on the load performance value, and comparing the hoisting influence coefficient with a hoisting influence coefficient threshold value, the method comprises the steps of obtaining a hoisting abnormal signal, carrying out N times of hoisting tests on to-be-hoisted heavy metal by using electromagnetic hoisting equipment based on the hoisting abnormal signal, obtaining reference data, obtaining a hoisting characterization value based on the reference data, and setting a hoisting characterization redundant value according to comparison of the hoisting characterization value and a hoisting characterization threshold value so as to protect the electromagnetic hoisting equipment.

Description

Technical Field

[0002] The invention belongs to the technical field of lifting machinery, in particular to a control system for electromagnetic lifting equipment. Background Art

[0004] Traditional electromagnetic lifting equipment control systems mostly use DC contactors to regulate the magnetic field. However, DC contactors have problems such as easy contact burnout and short mechanical life, which seriously affect the operating stability and reliability of the lifting equipment. In addition, electromagnetic lifting equipment in the prior art often lacks effective safety measures when facing unstable grid voltage or electromagnetic chuck magnetization failure, and there are safety hazards such as material falling.

[0005] The related invention in this field with publication number CN111532985A is a mechanical lifting equipment overload alarm control system, including: collecting the operating condition points of the truck crane using the road spectrum through the working condition data acquisition module, and using the Matlab calculation model to classify and analyze the working condition points and perform statistical operations, and finally realize the intuitive display of the boarding condition and the getting off condition in the form of working condition factor data. However, in the above-mentioned prior art, it is impossible to timely discover and deal with potential safety hazards, and it is impossible to improve the safety and reliability of the lifting operation. In the above-mentioned prior art, there is a lack of optimized lifting operation control, and it is impossible to improve the intelligence level of the lifting operation.

[0006] To this end, the present invention provides a control system for an electromagnetic lifting device. Summary of the invention

[0008] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0009] The technical solution adopted by the present invention to solve the technical problem is: obtaining parameter data of the metal to be lifted, and obtaining the load performance value based on the parameter data analysis;

[0010] Based on the load performance value, a lifting influence coefficient is obtained, and the lifting influence coefficient is compared with a lifting influence coefficient threshold to obtain a lifting abnormality signal;

[0011] Based on the lifting abnormality signal, use electromagnetic lifting equipment to perform N lifting tests on the metal to be lifted, obtain reference data, obtain the lifting characterization value based on the reference data, and set the lifting characterization redundancy value according to the comparison between the lifting characterization value and the lifting characterization threshold to protect the electromagnetic lifting equipment;

[0012] As a further technical solution of the present invention, the power supply current value and the number of coil turns in the electromagnetic lifting device are obtained, the power supply current value is marked as I, the number of coil turns is marked as N, and the formula is used to calculate the power supply current value. Obtain the magnetomotive force E;

[0013] According to Ohm's law of magnetic circuit, the magnetic flux φ in the magnetic circuit is equal to the magnetomotive force E acting on the magnetic circuit divided by the magnetic resistance Rm of the magnetic circuit. The magnetic flux φ is calculated;

[0014] By formula The magnetic attraction force F is calculated, where k is the preset proportional coefficient and B is the magnetic induction intensity;

[0015] As a further technical solution of the present invention, the surface flatness is marked as PZ, and the contact area ratio is marked as MJ;

[0016] The surface flatness PZ and contact area MJ are processed by the formula The load performance value is calculated, where s1 and s2 are both preset proportional coefficients;

[0017] As a further technical solution of the present invention, the contact area ratio is obtained by:

[0018] The metal to be lifted is measured to obtain the size of the contact surface of the electromagnetic lifting device electromagnet of the metal to be lifted. The size generally includes length and width. The length and width are multiplied to obtain the contact area of ​​the electromagnetic lifting device.

[0019] The contact area is calculated as a ratio to the total area of ​​the metal to be lifted, and the contact area ratio is obtained;

[0020] As a further technical solution of the present invention, the magnetic attraction force F and the load performance value FZ are processed by the formula The lifting influence coefficient is calculated, where a1 and a2 are both preset proportional coefficients;

[0021] The lifting influence coefficient YX is compared with the lifting influence coefficient threshold. The specific comparison process is as follows:

[0022] If the lifting influence coefficient is less than or equal to the lifting influence coefficient threshold, a lifting abnormality signal is generated;

[0023] If the lifting influence coefficient is greater than the lifting influence coefficient threshold, no processing will be performed;

[0024] As a further technical solution of the present invention, the proportion of over-accuracy times is marked as A, the proportion of over-accuracy amplitude deviation is marked as B, and the degree of occlusion is marked as C;

[0025] By formula The lifting abnormal value S is calculated, where c1, c2, and c3 are all preset proportional coefficients;

[0026] As a further technical solution of the present invention, the method for obtaining the percentage of the number of times of over-accuracy is as follows:

[0027] Perform N lifting tests on the metal to be lifted, obtain the shaking amplitude of the metal to be lifted, establish an XY coordinate system, where the X axis is the number of tests and the Y axis is the shaking amplitude, mark the test data in the coordinate system, connect the marked points, and process to obtain a shaking amplitude change curve;

[0028] Based on the standard value of shaking amplitude, mark the standard value of shaking amplitude on the Y axis, draw a straight line parallel to the X axis with the standard value of shaking amplitude, and mark the straight line as the reference line;

[0029] Count the number of tests in which the shaking amplitude exceeds the baseline in the shaking amplitude variation curve, calculate the ratio of the number of tests in which the shaking amplitude exceeds the baseline to the total number of lifting tests, and obtain the proportion of the number of times exceeding the accuracy;

[0030] As a further technical solution of the present invention, the method for obtaining the over-accuracy amplitude deviation ratio is as follows:

[0031] Measure the shaking amplitude values ​​in the test times when the shaking amplitude exceeds the baseline, and mark them as the over-accuracy amplitude values;

[0032] The difference between the over-accuracy amplitude value and the standard value of the shaking amplitude is calculated to obtain the over-accuracy amplitude deviation;

[0033] The excess amplitude difference is calculated by ratio with the standard value of shaking amplitude, and the excess amplitude deviation ratio is obtained by processing;

[0034] As a further technical solution of the present invention, the load performance value FZ and the lifting abnormal value S are processed by the formula The lifting characterization value BZ is calculated, where b1 and b2 are both preset proportional coefficients;

[0035] As a further technical solution of the present invention, the lifting characterization value is compared with the lifting characterization threshold value, and the specific comparison process is as follows:

[0036] If the lifting characterization value is greater than or equal to the lifting characterization threshold, the electromagnetic lifting equipment is highly safe;

[0037] If the lifting characterization value is less than the lifting characterization threshold, the electromagnetic lifting equipment has low safety, and a lifting characterization redundancy value needs to be set for the electromagnetic lifting equipment;

[0038] A lifting characterization redundancy value is set before the lifting characterization value reaches a threshold value. When the lifting characterization value reaches the lifting characterization redundancy value, the electromagnetic lifting device sends an adjustment signal to perform a safety assessment on the metal to be lifted, so as to achieve the purpose of protecting the electromagnetic lifting device.

[0039] The beneficial effects of the present invention are as follows:

[0040] 1. By collecting the load characteristics (including surface flatness and contact area) and magnetic attraction force and other parameter data of the metal to be lifted, the lifting influence coefficient is calculated in combination with the power supply current and coil turns of the electromagnetic lifting equipment, and the lifting influence coefficient is compared with the lifting influence coefficient threshold to obtain a lifting abnormal signal. This embodiment comprehensively considers the physical properties of the metal and the performance of the electromagnetic lifting equipment, provides a basis for subsequent abnormal signal analysis, ensures the safety of the lifting operation, and improves the safety and reliability of the lifting operation;

[0041] 2. Based on the abnormal lifting signal, N lifting tests are performed to obtain reference data such as the degree of obstruction and shaking amplitude of the metal to be lifted, and then the abnormal lifting value is calculated and combined with the load performance value to obtain the lifting characterization value. By comparing the lifting characterization value with the lifting characterization threshold and setting the lifting characterization redundancy value before reaching the threshold, the electromagnetic lifting equipment can send out an adjustment signal in advance when the lifting capacity is weakened or the safety is reduced, and conduct a safety assessment to protect the equipment and ensure the safe progress of the lifting operation. By setting the lifting characterization redundancy value, the system can give early warning and regulation before reaching the lifting characterization threshold, further enhancing the safety and stability of the system, achieving optimal lifting operation control, and improving the intelligence level of lifting operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The present invention will be further described below in conjunction with the accompanying drawings.

[0044] Figure 1 is a flowchart of a control system of an electromagnetic lifting device according to Embodiment 1 of the present invention;

[0045] Figure 2 It is a flowchart of a control system of an electromagnetic lifting device described in Example 2 of the present invention. DETAILED DESCRIPTION

[0047] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0048] Example 1

[0049] like Figure 1 A control system for an electromagnetic lifting device according to an embodiment of the present invention includes:

[0050] Data acquisition module: obtains parameter data of the metal to be lifted, and obtains the load performance value based on parameter data analysis;

[0051] It should be noted that the parameter data includes load characteristics and magnetic attraction, where the load characteristics include surface flatness and contact area;

[0052] It needs to be explained that the meaning of surface flatness is: the flatness of the surface of the metal to be lifted. The higher the flatness of the surface of the metal to be lifted, the more fully the metal to be lifted can be attached when the electromagnet of the electromagnetic lifting device is magnetically attracted. The contact area includes the contact area between the metal to be lifted and the electromagnet of the electromagnetic lifting device.

[0053] Obtain the power supply current value and coil turns in the electromagnetic lifting equipment, mark the power supply current value as I, mark the coil turns as N, and use the formula Obtain the magnetomotive force E;

[0054] According to Ohm's law of magnetic circuit, the magnetic flux φ in the magnetic circuit is equal to the magnetomotive force E acting on the magnetic circuit divided by the magnetic resistance Rm of the magnetic circuit;

[0055] It should be noted that magnetic resistance Rm is a physical quantity that describes the difficulty of magnetic flux flow in a magnetic circuit. The greater the magnetic resistance, the more difficult it is for magnetic flux to flow.

[0056] Specifically, through the formula The magnetic flux φ is calculated;

[0057] In some embodiments, the formula The magnetic attraction force F is calculated, where k is the preset proportional coefficient and B is the magnetic induction intensity;

[0058] It needs to be explained that the magnetic induction intensity B is directly measured using a magnetic induction intensity measuring instrument such as a Tesla meter or a Gauss meter;

[0059] The weight of the metal to be lifted is multiplied by the gravity coefficient to obtain the weight of the metal to be lifted;

[0060] It needs to be explained that the gravity coefficient represents the ratio of the gravitational acceleration of an object to the mass of the object, which is generally taken as 9.81 m / s²;

[0061] Compare the magnetic attraction force F with the weight of the metal to be lifted. The specific comparison process is as follows:

[0062] If the magnetic attraction force F is greater than the weight of the metal to be lifted, the electromagnetic lifting equipment can lift the metal to be lifted normally and safely without any other treatment;

[0063] If the magnetic attraction force F is less than or equal to the weight of the metal to be lifted, the electromagnetic lifting equipment cannot lift the metal normally or cannot lift the metal under the condition of ensuring safety;

[0064] Use tools such as a level, laser rangefinder, and surface roughness measuring instrument to measure the surface flatness of the metal to be lifted, and classify the metal to be lifted into different grades according to the measurement results. The specific classifications are as follows:

[0065] If the surface flatness of the metal to be lifted is less than the surface flatness reference value, the metal to be lifted will be marked as concave flat metal;

[0066] If the surface flatness of the metal to be lifted is greater than or equal to the surface flatness reference value but less than the surface flatness threshold value, the metal to be lifted is marked as level metal;

[0067] If the surface flatness of the metal to be lifted is greater than or equal to the surface flatness threshold, the metal to be lifted is marked as mirror-flat metal;

[0068] It needs to be explained that the reference value of surface flatness is set by the staff in this field based on a large amount of historical measurement data;

[0069] It should be noted that the greater the surface flatness of the metal to be lifted, the closer the contact between the metal to be lifted and the electromagnet of the electromagnetic lifting device during lifting;

[0070] The metal to be lifted is measured to obtain the size of the contact surface of the electromagnetic lifting device electromagnet of the metal to be lifted. The size generally includes length and width. The length and width are multiplied to obtain the contact area of ​​the electromagnetic lifting device.

[0071] The contact area is calculated as a ratio to the total area of ​​the metal to be lifted, and the contact area ratio is obtained;

[0072] It should be noted that the larger the contact area ratio, the greater the adsorption force between the electromagnet of the electromagnetic lifting equipment and the metal to be lifted;

[0073] The surface flatness is marked as PZ and the contact area ratio is marked as MJ;

[0074] The surface flatness PZ and contact area MJ are processed by the formula The load performance value is calculated, where s1 and s2 are both preset proportional coefficients;

[0075] It should be noted that the load performance value reflects the quantitative index of the lifting weight of the metal to be lifted. Specifically, the smaller the load performance value FZ is, the smaller the lifting load of the metal to be lifted is, that is, the higher the lifting success rate is. Conversely, the larger the load performance value FZ is, the larger the lifting load of the metal to be lifted is, that is, the lower the lifting success rate is.

[0076] Lifting abnormality signal acquisition module: based on the load performance value, obtain the lifting influence coefficient, compare the lifting influence coefficient with the lifting influence coefficient threshold, and obtain the lifting abnormality signal;

[0077] The magnetic attraction force F and the load performance value FZ are processed by the formula The lifting influence coefficient is calculated, where a1 and a2 are both preset proportional coefficients;

[0078] It should be noted that the unit of the lifting influence coefficient YX is: kg·m / s 2 The lifting influence coefficient YX reflects the quantitative standard between the magnetic attraction force F and the load performance value FZ. If the magnetic attraction force F is larger, the lifting influence coefficient is larger. Similarly, if the load performance value FZ is smaller, the lifting influence coefficient is also larger. The larger the lifting influence coefficient, the higher the lifting stability of the electromagnetic lifting equipment. Conversely, the smaller the lifting influence coefficient, the worse the lifting stability of the electromagnetic lifting equipment.

[0079] The lifting influence coefficient YX is compared with the lifting influence coefficient threshold. The specific comparison process is as follows:

[0080] If the lifting influence coefficient is less than or equal to the lifting influence coefficient threshold, a lifting abnormality signal is generated;

[0081] If the lifting influence coefficient is greater than the lifting influence coefficient threshold, no processing will be performed;

[0082] The technical solution of the embodiment of the present invention is: by collecting the load characteristics (including surface flatness and contact area) of the metal to be lifted, the magnetic attraction force and other parameter data, combining the power supply current and coil turns of the electromagnetic lifting equipment, calculating the lifting influence coefficient, and comparing the lifting influence coefficient with the lifting influence coefficient threshold to obtain a lifting abnormal signal. This embodiment comprehensively considers the physical properties of the metal and the performance of the electromagnetic lifting equipment, and provides a basis for subsequent abnormal signal analysis.

[0083] Example 2

[0084] Based on Example 1, Figure 2 A control system for an electromagnetic lifting device according to an embodiment of the present invention includes:

[0085] Abnormal signal analysis module: Based on the abnormal lifting signal, use electromagnetic lifting equipment to perform N lifting tests on the metal to be lifted, obtain reference data, obtain the lifting characterization value based on the reference data, and set the lifting characterization redundancy value based on the comparison between the lifting characterization value and the lifting characterization threshold to protect the electromagnetic lifting equipment;

[0086] It should be noted that the reference data include the degree of occlusion and the amplitude of shaking;

[0087] The meaning of the degree of obstruction is: the part of the metal surface that is blocked by other objects and cannot be magnetically attracted;

[0088] Measure the shielding area of ​​the metal surface to be lifted, calculate the ratio of the shielding area of ​​the metal surface to be lifted to the surface area of ​​the metal to be lifted, and obtain the shielding degree of the metal to be lifted;

[0089] Perform N lifting tests on the metal to be lifted, obtain the shaking amplitude of the metal to be lifted, establish an XY coordinate system, where the X axis is the number of tests and the Y axis is the shaking amplitude, mark the test data in the coordinate system, connect the marked points, and process to obtain a shaking amplitude change curve;

[0090] Based on the standard value of shaking amplitude, mark the standard value of shaking amplitude on the Y axis, draw a straight line parallel to the X axis with the standard value of shaking amplitude, and mark the straight line as the reference line;

[0091] It should be noted that the standard value of the shaking data is set by the staff in this field by traversing a large amount of data;

[0092] Count the number of tests in which the shaking amplitude exceeds the baseline in the shaking amplitude variation curve, calculate the ratio of the number of tests in which the shaking amplitude exceeds the baseline to the total number of lifting tests, and obtain the proportion of the number of times exceeding the accuracy;

[0093] Measure the shaking amplitude values ​​in the test times when the shaking amplitude exceeds the baseline, and mark them as the over-accuracy amplitude values;

[0094] The difference between the over-accuracy amplitude value and the standard value of the shaking amplitude is calculated to obtain the over-accuracy amplitude deviation;

[0095] The excess amplitude difference is calculated by ratio with the standard value of shaking amplitude, and the excess amplitude deviation ratio is obtained by processing;

[0096] The percentage of over-accuracy times is marked as A, the percentage of over-accuracy amplitude deviation is marked as B, and the degree of occlusion is marked as C;

[0097] The data of the over-accuracy ratio A, the over-accuracy deviation ratio B and the occlusion degree C are processed and the formula is used to The lifting abnormal value S is calculated, where c1, c2, and c3 are all preset proportional coefficients;

[0098] It should be noted that the lifting abnormal value reflects the quantitative index of the shaking amplitude of the metal to be lifted when the electromagnetic lifting equipment is lifting. The larger the lifting abnormal value, the greater the shaking amplitude of the metal to be lifted, resulting in reduced safety of the lifting process. Conversely, the smaller the lifting abnormal value, the smaller the shaking amplitude of the metal to be lifted, and the process safety is guaranteed.

[0099] The load performance value FZ and the lifting abnormal value S are processed by the formula The lifting characterization value BZ is calculated, where b1 and b2 are both preset proportional coefficients;

[0100] It should be noted that the lifting characteristic value reflects the quantitative standard of the load performance value and the lifting abnormal value. The smaller the load performance value and the lifting abnormal value, the larger the lifting characteristic value, that is, the stronger the lifting capacity of the electromagnetic lifting equipment and the higher the safety. Conversely, the larger the load performance value and the lifting abnormal value, the smaller the lifting characteristic value, that is, the weaker the lifting capacity of the electromagnetic lifting equipment and the worse the safety.

[0101] The lifting characteristic value is compared with the lifting characteristic threshold. The specific comparison process is as follows:

[0102] If the lifting characterization value is greater than or equal to the lifting characterization threshold, the electromagnetic lifting equipment is highly safe;

[0103] If the lifting characterization value is less than the lifting characterization threshold, the electromagnetic lifting equipment has low safety, and a lifting characterization redundancy value needs to be set for the electromagnetic lifting equipment;

[0104] In some embodiments, a lifting characteristic redundancy value is set before the lifting characteristic value reaches a threshold value, and when the lifting characteristic value reaches the lifting characteristic redundancy value, the electromagnetic lifting device sends an adjustment signal to perform a safety assessment on the metal to be lifted, so as to achieve the purpose of protecting the electromagnetic lifting device;

[0105] The meaning of the lifting characterization redundancy value is: before reaching the lifting characterization threshold, a safety margin is set to ensure the normal operation and safety of the electromagnetic lifting equipment;

[0106] The technical solution of the embodiment of the present invention is: based on the lifting abnormality signal, reference data such as the degree of obstruction and shaking amplitude of the metal to be lifted are obtained through N lifting tests, and then the lifting abnormality value is calculated and combined with the load performance value to obtain the lifting characterization value, by comparing the lifting characterization value with the lifting characterization threshold, and setting the lifting characterization redundancy value before reaching the threshold, the electromagnetic lifting equipment can send an adjustment signal in advance when the lifting capacity is weakened or the safety is reduced, and perform a safety assessment to protect the equipment and ensure the safe progress of the lifting operation.

[0107] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A control system for an electromagnetic lifting device, characterized in that: include: Obtain parameter data of the metal to be lifted, and obtain the load performance value based on the parameter data analysis; Based on the load performance value, a lifting influence coefficient is obtained, and the lifting influence coefficient is compared with a lifting influence coefficient threshold to obtain a lifting abnormality signal; Based on the abnormal lifting signal, use electromagnetic lifting equipment to perform N lifting tests on the metal to be lifted, obtain reference data, and obtain the lifting characterization value based on the reference data. According to the comparison between the lifting characterization value and the lifting characterization threshold, the lifting characterization redundancy value is set to protect the electromagnetic lifting equipment.

2. The control system of an electromagnetic lifting device according to claim 1, characterized in that: Obtain the power supply current value and coil turns in the electromagnetic lifting equipment, mark the power supply current value as I, mark the coil turns as N, and use the formula Obtain the magnetomotive force E; According to Ohm's law of magnetic circuit, the magnetic flux φ in the magnetic circuit is equal to the magnetomotive force E acting on the magnetic circuit divided by the magnetic resistance Rm of the magnetic circuit. The magnetic flux φ is calculated; By formula The magnetic attraction force F is calculated, where k is the preset proportional coefficient and B is the magnetic induction intensity.

3. The control system of an electromagnetic lifting device according to claim 1, characterized in that: The surface flatness is marked as PZ and the contact area ratio is marked as MJ; The surface flatness PZ and contact area MJ are processed by the formula The load performance value is calculated, where s1 and s2 are both preset proportional coefficients.

4. The control system of an electromagnetic lifting device according to claim 3, characterized in that: The contact area ratio is obtained as follows: The metal to be lifted is measured to obtain the size of the contact surface of the electromagnetic lifting device electromagnet of the metal to be lifted. The size generally includes length and width. The length and width are multiplied to obtain the contact area of ​​the electromagnetic lifting device. The ratio of the contact area to the total area of ​​the metal to be lifted is calculated and processed to obtain the contact area ratio.

5. The control system of an electromagnetic lifting device according to claim 1, characterized in that: The magnetic attraction force F and the load performance value FZ are processed by the formula The lifting influence coefficient is calculated, where a1 and a2 are both preset proportional coefficients; The lifting influence coefficient YX is compared with the lifting influence coefficient threshold. The specific comparison process is as follows: If the lifting influence coefficient is less than or equal to the lifting influence coefficient threshold, a lifting abnormality signal is generated; If the lifting influence coefficient is greater than the lifting influence coefficient threshold, no processing is performed.

6. The control system of an electromagnetic lifting device according to claim 1, characterized in that: The percentage of over-accuracy times is marked as A, the percentage of over-accuracy amplitude deviation is marked as B, and the degree of occlusion is marked as C; By formula The lifting abnormal value S is calculated, where c1, c2, and c3 are all preset proportional coefficients.

7. The control system of an electromagnetic lifting device according to claim 6, characterized in that: The method for obtaining the percentage of the number of times of over-accuracy is as follows: Perform N lifting tests on the metal to be lifted, obtain the shaking amplitude of the metal to be lifted, establish an XY coordinate system, where the X axis is the number of tests and the Y axis is the shaking amplitude, mark the test data in the coordinate system, connect the marked points, and process to obtain a shaking amplitude change curve; Based on the standard value of shaking amplitude, mark the standard value of shaking amplitude on the Y axis, draw a straight line parallel to the X axis with the standard value of shaking amplitude, and mark the straight line as the reference line; The number of tests in which the shaking amplitude exceeds the baseline in the shaking amplitude variation curve is counted, and the ratio of the number of tests in which the shaking amplitude exceeds the baseline to the total number of lifting tests is calculated to obtain the proportion of the over-accuracy times.

8. The control system of an electromagnetic lifting device according to claim 6, characterized in that: The method for obtaining the over-accuracy amplitude deviation ratio is as follows: Measure the shaking amplitude values ​​in the test times when the shaking amplitude exceeds the baseline, and mark them as the over-accuracy amplitude values; The difference between the over-accuracy amplitude value and the standard value of the shaking amplitude is calculated to obtain the over-accuracy amplitude deviation; The ratio of the excess amplitude difference to the standard value of the shaking amplitude is calculated and processed to obtain the excess amplitude deviation ratio.

9. The control system of an electromagnetic lifting device according to claim 1, characterized in that: The load performance value FZ and the lifting abnormal value S are processed by the formula The lifting characterization value BZ is calculated, where b1 and b2 are both preset proportional coefficients.

10. The control system of an electromagnetic lifting device according to claim 1, characterized in that: The lifting characteristic value is compared with the lifting characteristic threshold. The specific comparison process is as follows: If the lifting characterization value is greater than or equal to the lifting characterization threshold, the electromagnetic lifting equipment is highly safe; If the lifting characterization value is less than the lifting characterization threshold, the electromagnetic lifting equipment has low safety, and a lifting characterization redundancy value needs to be set for the electromagnetic lifting equipment; A lifting characterization redundancy value is set before the lifting characterization value reaches a threshold value. When the lifting characterization value reaches the lifting characterization redundancy value, the electromagnetic lifting device sends an adjustment signal to perform a safety assessment on the metal to be lifted, so as to achieve the purpose of protecting the electromagnetic lifting device.

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