A tower crane anti-bolt-loosening alarm system

Abstract

The present invention belongs to the technical field of early warning and identification of tower crane bolt loosening. Specifically, a tower crane bolt loosening prevention and alarm system is provided. The system includes: by identifying the position of the center of gravity of the load on the tower crane boom, and identifying the bolt loosening situation according to the difference in the center of gravity position of the load, potential safety hazards of bolt loosening can be found more accurately; by analyzing the displacement stability response of the transport movement trajectory of the tower crane boom and the torque loosening degree of each connecting bolt of each standard section, the possibility of bolt loosening is examined from the dimension of the load on the boom; considering multiple factors such as the wind force resonance level, vibration and abnormal sound level, and rust and mottling level, the possibility of bolt loosening is examined from the dimension of the wind load characteristics; by constructing a loosening tendency relationship formula for each connecting bolt of each standard section of the tower crane, the corresponding position of the loosening bolt is located, which helps to formulate a more accurate and effective maintenance plan based on real-time data and analysis results.

Description

Technical Field

[0001] The present invention belongs to the technical field of loosening warning and identification of tower crane bolts, and relates to a tower crane bolt loosening prevention alarm system. Background Art

[0002] With the booming development of the construction industry and the expansion of industrial production scale, the working tasks of tower cranes are becoming increasingly heavy, and their operation safety is directly related to the life safety of construction site personnel and the smooth progress of the project. Tower cranes usually work in complex outdoor environments, facing various harsh natural conditions and working conditions. For example, strong winds will cause the tower crane to bear large lateral forces and torques, increasing the stress burden on the bolts and easily leading to bolt loosening; in addition, during the frequent lifting, slewing, luffing and other operation processes of the tower crane, various dynamic loads and vibrations will be generated, which will also accelerate the loosening and wear of the bolts. In this complex and harsh operating environment, traditional detection methods and technologies are difficult to effectively cope with, so there is an urgent need for a more intelligent, sensitive and reliable bolt loosening monitoring and alarm system that can adapt to complex working conditions and accurately monitor the bolt loosening situation in real time, providing strong guarantee for the safe operation of the tower crane.

[0003] Although there are some solutions for the loosening warning and identification of tower crane bolts in the existing schemes, there are still the following limitations: when the existing technology identifies the bolt loosening situation, it usually only simply issues an alarm. When formulating a maintenance plan, it usually can only perform static torque detection based on the data of regular inspections, and cannot grasp the torque change situation of the bolts during the operation of the tower crane in real time. At the same time, in the existing technology, the detection and analysis of the stress resonance situation between the connecting bolt torque force and the wind direction are not perfect, which makes the connecting bolts of the tower crane prone to accelerate loosening and damage due to resonance in case of harsh weather conditions such as strong winds, seriously affecting the safe operation of the tower crane. Summary of the Invention

[0004] In view of this, to solve the problems raised in the above background art, a tower crane bolt loosening prevention alarm system is proposed.

[0005] The object of the present invention can be achieved by the following technical solutions: The present invention provides a tower crane bolt loosening prevention alarm system, which includes: a tower crane bolt bearing analysis module for obtaining the carrying and moving trajectory of the tower crane boom and its load weight, and analyzing the basic bearing fluctuation coefficient ε dot→k of the corresponding positions of each connecting bolt of each standard section, and numbering each standard section of the tower crane as 1, 2,...dot..., c, and numbering the positions of each connecting bolt as 1, 2,...k..., m.

[0006] The self-vibration detection module is used to extract the number of starting and rotating operations of the tower crane's boom during the operation cycle of the specified stage, number the starting and rotating operation times as 1, 2,... i..., b, and analyze the characteristics of the self-vibration results, including the corresponding displacement stable response R of the carrying movement trajectory of the tower crane's boom. trans And the torque looseness of each connecting bolt corresponding to each standard section.

[0007] The external vibration detection module is used to detect the characteristics of wind loads, including the wind direction and wind force of each starting and rotating operation of the tower crane's boom during the operation cycle of the specified stage, and evaluate the wind load influence coefficient WL of each connecting bolt corresponding to each standard section from the aspects of wind direction force resonance, vibration abnormal sound, and rust and mottle. dot→k .

[0008] The tower crane bolt warning module is used to combine the characteristics of the self-vibration results and the wind load influence coefficient, construct the looseness tendency relationship formula of each connecting bolt corresponding to each standard section of the tower crane, locate the corresponding position of the loose bolt, and conduct warning evaluation on it.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) By identifying the position of the center of gravity of the load on the tower crane's boom and identifying the bolt loosening situation according to the difference in the position of the center of gravity of the load, the present invention can more accurately discover the potential safety hazards of bolt loosening.

[0010] (2) By testing the rotation speed of each standard section during the starting and rotating operation, analyzing the corresponding displacement stable response of the carrying movement trajectory of the tower crane's boom, and by testing the combined torque force of each connecting bolt corresponding to each standard section during the starting and rotating operation, analyzing its torque looseness, the present invention further tests the possibility of bolt loosening from the dimension of the load on the boom, closely combines the operating state of the tower crane with the mechanical properties of the bolts, and forms a comprehensive safety guarantee system.

[0011] (3) By testing the force resonance of the combined torque force of the connecting bolt and the wind direction, the abnormal sound of the connecting bolt during force application, and the stress concentration of the crack source in the area near the rust and mottle degree of the connecting bolt, the present invention tests the possibility of bolt loosening from the dimension of the wind load characteristics, which helps to make targeted adjustments and improvements to the wind prevention measures of the tower crane according to the test situation.

[0012] (4) By analyzing the basic bearing fluctuation coefficient of the position of each connecting bolt corresponding to each standard section, and combining the characteristics of the self-vibration results and the wind load influence coefficient, constructing the looseness tendency relationship formula of each connecting bolt corresponding to each standard section of the tower crane, and accordingly locating the corresponding position of the loose bolt, the present invention helps to formulate a more accurate and effective maintenance plan based on real-time data and analysis results. Description of the Drawings

[0013] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0014] Figure 1 It is a schematic diagram of the connection of the system modules of the present invention.

[0015] Figure 2 It is a schematic diagram of the standard section of the tower crane of the present invention.

[0016] Reference numerals: 1, standard section. Specific embodiments

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, rather than all, embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention.

[0018] Please refer to Figure 1 As shown, the present invention provides a tower crane anti-bolt loosening alarm system, which includes: a tower crane bolt load analysis module, a self-vibration detection module, an external vibration detection module, and a tower crane bolt warning module.

[0019] The tower crane bolt load analysis module is connected to the self-vibration detection module, the self-vibration detection module is connected to the external vibration detection module, and the tower crane bolt warning module is respectively connected to the tower crane bolt load analysis module, the self-vibration detection module, and the external vibration detection module.

[0020] Please refer to Figure 2 As shown, the tower crane bolt load analysis module is used to obtain the carrying movement trajectory of the tower crane boom and its load weight, and analyze the basic load fluctuation coefficient ε dot→k of the corresponding connection bolt positions of each standard section, and number the standard sections of the tower crane as 1, 2,...dot..., c, and number the connection bolt positions as 1, 2,...k..., m.

[0021] In a preferred embodiment, the analysis of the basic load fluctuation coefficient of the corresponding connection bolt positions of each standard section includes: locating the rotation angle θ dot→k of the corresponding connection bolt positions when the tower crane boom moves to the positions of each standard section from the carrying movement trajectory of the tower crane boom.

[0022] The rotation angle refers to the horizontal rotation angle of the horizontal axial position of the tower crane's boom when it moves to the position of each standard section relative to the initial horizontal axial position.

[0023] Identify the position of the center of gravity of the load on the tower crane's boom, and then obtain the distance from it to the positions of the corresponding connecting bolts of each standard section, denoted as the external weight distance l of the corresponding connecting bolts of each standard section dot→k 。

[0024] Analyze the foundation bearing fluctuation coefficient of the positions of the corresponding connecting bolts of each standard section Where θ0 and l0 respectively represent the preset reference rotation angle and reference external weight distance.

[0025] In a further preferred embodiment, the corresponding method for identifying the position of the center of gravity of the load on the tower crane's boom is as follows: Use a high-precision scanner to perform three-dimensional scanning on the load on the tower crane's boom, obtain the contour data of the load, generate a three-dimensional model of the load, and then use three-dimensional modeling and calculation software (such as CAD, CAE, etc.) to load and analyze the three-dimensional model of the load, and export the position of the center of gravity.

[0026] The present invention can more accurately discover potential safety hazards of bolt loosening by identifying the position of the center of gravity of the load on the tower crane's boom and identifying the bolt loosening situation according to the difference in the position of the center of gravity of the load. In actual operation, tower cranes often need to carry objects of different weights and shapes, and the position of the center of gravity and the transportation movement trajectory of these objects will directly affect the stress conditions of each standard section and connecting bolts of the tower crane. Therefore, identifying the bolt loosening situation according to the difference in the position of the center of gravity of the load can more accurately discover potential safety hazards of bolt loosening, and thus take necessary measures for prevention and repair to avoid serious safety accidents.

[0027] The self-vibration detection module is used to extract the number of start-up operations of the tower crane's boom during the operation cycle of the specified stage, number the start-up operation times as 1, 2,... i..., b, and analyze the characteristics of the self-vibration results, including the displacement stability response R of the transportation movement trajectory of the tower crane's boom trans 、the torque looseness of the corresponding connecting bolts of each standard section.

[0028] In a preferred embodiment, the analysis of the displacement stability response of the transportation movement trajectory of the tower crane's boom includes: obtaining the time t when the tower crane's boom moves to the position of each standard section dot ,compare them with each other and calculate the rotation speed of each standard section Where t (dot-1)Indicates the time when the tower crane's jib moves to the (dot - 1)th standard section position, the number of m bolt positions, extracts the number of starting and rotating operations of the tower crane's jib during the operation cycle of the specified stage, and then calculates the rotational speed of each standard section during each starting and rotating operation in the same way.

[0029] The starting and rotating operation is the cyclic load - carrying operation of the tower crane's jib.

[0030] Analyze the displacement - stable response of the carrying and moving trajectory of the tower crane's jib. Among them Indicates the rotational speed of the (dot + 1)th standard section during the i - th starting and rotating process, Δv represents the preset reference deviation value of the rotational speed, c represents the number of tower crane standard sections, and b represents the total number of starting and rotating operations.

[0031] In a further preferred implementation manner, the method for obtaining the torque looseness of each connection bolt of each standard section is as follows: taking the tower crane's embedding point as the coordinate reference point, arbitrarily constructing a three - dimensional space coordinate system, detecting the strain force condition of each connection bolt of each standard section through strain gauges arranged at their positions, obtaining the horizontal shear force and vertical tensile force of each connection bolt of each standard section during each starting and rotating operation of the tower crane's jib in the operation cycle of the specified stage, multiplying them by the corresponding coordinate distance length of the preset unit torque, obtaining the horizontal - direction torque and vertical - direction torque of each connection bolt of each standard section during each starting and rotating operation, and importing them into the three - dimensional space coordinate system according to their coordinate distance lengths.

[0032] Exemplarily, the construction method of the three - dimensional space coordinate system is: taking the main working direction of the tower crane or the main layout direction of the site as the X - axis direction, the direction perpendicular to the X - axis in the horizontal plane as the Y - axis direction, and the vertically upward direction as the Z - axis direction, that is, the lifting direction of the tower crane's boom.

[0033] Construct the horizontal - direction torque and vertical - direction torque of each connection bolt of each standard section during each starting and rotating operation into a synthetic torque force through the vector synthesis method.

[0034] Compare the synthetic torque forces of each connection bolt of each standard section during each starting and rotating operation, and form the torque force moving trajectory of each connection bolt of each standard section. Based on this, identify the torque dynamics of each connection bolt of each standard section of the tower crane. The torque dynamics include rotational torque, axial torque, and shear torque. Then match them with the preset torque looseness corresponding to each torque dynamic to obtain the torque looseness of each connection bolt of each standard section.

[0035] The rotational torque refers to that the torque moving trajectory gradually forms a closed curve in the three - dimensional space coordinate system. During frequent starting and rotating operations, the rotational torque will continuously change the force state of the bolt, resulting in bolt loosening.

[0036] The axial torque refers to the fact that the torque movement trajectory is more inclined to move vertically along the axis in a three-dimensional space coordinate system. It will cause the bolt to be subjected to tensile or compressive forces. During the operation of a tower crane, due to the lifting and tilting of the tower crane's boom, the axial torque will cause the bolts to loosen.

[0037] The shear torque refers to the fact that the torque movement trajectory is more inclined to move horizontally along the axis in a three-dimensional space coordinate system. During the operation of a tower crane, due to the action of various complex loads, the shear torque will cause the bolts to loosen or even break.

[0038] By inspecting the rotational speed of each standard section during the starting rotation operation of the tower crane and analyzing the corresponding displacement stability response of the carrying movement trajectory of the tower crane's boom, the present invention can comprehensively and meticulously understand the dynamic characteristics of the tower crane during actual operation. By inspecting the combined torque force of each corresponding connecting bolt of each standard section during the starting rotation operation and analyzing its torque looseness degree, it provides a direct and accurate basis for evaluating the fastening state of the bolts. Furthermore, it inspects the possibility of bolt loosening from the dimension of the load carried by the boom, closely combines the operating state of the tower crane with the mechanical properties of the bolts, and forms a comprehensive safety guarantee system.

[0039] The external vibration detection module is used to detect the characteristics of wind loads, including the wind direction and wind force of each starting rotation operation of the tower crane's boom during the operation cycle of a specified stage, and evaluate the wind load influence coefficient WL of each corresponding connecting bolt of each standard section from the aspects of wind direction force resonance, vibration abnormal sound, and rust and mottle. dot→k 。

[0040] In a preferred embodiment, the detection content of the wind direction force resonance aspect includes: detecting the wind direction and wind force of each starting rotation operation of the tower crane's boom during the operation cycle of a specified stage through a wind force sensor, and introducing the wind direction of each starting rotation operation into a three-dimensional space coordinate system.

[0041] The wind direction angle specifically is: taking the due north direction as the reference (0°), recording the angle of the wind direction relative to the due north direction.

[0042] In the three-dimensional space coordinate system, compare the wind direction of each starting rotation operation with the corresponding coordinate direction of the combined torque force of each corresponding connecting bolt of each standard section during the corresponding starting rotation operation to obtain the wind direction force resonance angle of each corresponding connecting bolt of each standard section during each starting rotation operation. Compare it with the preset reference resonance angle ρ0 to calculate the wind direction force resonance degree of each corresponding connecting bolt of each standard section of the tower crane.

[0043] Specifically, the resonance phenomenon refers to the situation where when the pulsation frequency of the wind is close to the natural frequency of the tower crane structure, the structural vibration of the connecting bolts on the standard sections intensifies. In the tower crane and bolt system, when the component of the excitation effect of the wind direction on the bolt in its force direction is small, the possibility and degree of resonance will decrease, and thus the possibility of bolt loosening will also decrease. For example, assuming that the wind direction is perpendicular to the force direction of the bolt, the projection of the wind direction in the force direction of this bolt is zero. At this time, if there are no other factors causing frequency matching, resonance basically will not occur.

[0044] In a further preferred embodiment, the detection content of the vibration and abnormal sound level is as follows: Monitor the abnormal sound characteristics of each connecting bolt of each standard section during each start-up operation within the operation cycle of the tower crane boom at a specified stage through strain gauges, calculate the ratio of these characteristics to the preset reference abnormal sound characteristics, and then solve the mean value to obtain the vibration and abnormal sound risk factor η of each connecting bolt of each standard section of the tower crane. dot→k 。

[0045] The detection content of the rust and mottle level includes: Collect images of the areas near each connecting bolt of each standard section through image acquisition, detect the crack sources in the areas near each connecting bolt of each standard section based on image recognition technology, and detect the rust characteristics on the surfaces of each connecting bolt of each standard section of the tower crane. Calculate the ratio of these characteristics to the preset reference rust characteristics to obtain the rust and mottle degree of each connecting bolt of each standard section of the tower crane.

[0046] Specifically, after rust occurs on the bolt surface, the rust will continuously erode the bolt material, damaging its original metal structure. The texture of rust is loose and its strength is very low, unable to provide sufficient support for the bolt. Therefore, as the rusting intensifies, the effective load-bearing area of the bolt gradually decreases, and the overall strength drops significantly. When the bolt is subjected to external load, its bearing capacity weakens, it is prone to deformation, and then the connection becomes loose.

[0047] By collecting the heat source maps corresponding to the crack sources in the areas near each connecting bolt of each standard section, extract the temperature indications corresponding to the positions of the crack sources from the heat source maps, calculate the ratio of these temperature indications to the preset reference temperature indications to obtain the stress concentration degree of the crack sources of each connecting bolt of each standard section.

[0048] Multiply the rust and mottle degree of each connecting bolt of each standard section of the tower crane by the stress concentration degree of the crack sources to obtain the mottle and looseness risk factor μ of each connecting bolt of each standard section. dot→k 。

[0049] In a further preferred embodiment, the evaluation of the wind load influence coefficient of each connecting bolt of each standard section includes: Denote the wind force during each start-up operation within the operation cycle of the tower crane boom at a specified stage as w. i, and obtain the wind force w0 at the current detection moment of the tower crane's boom.

[0050] Evaluate the wind load influence coefficients of the corresponding connecting bolts of each standard section

[0051] By comprehensively considering multiple factors such as the wind direction force resonance level, vibration and abnormal sound level, and rust and mottling level, the present invention can more comprehensively evaluate the wind load influence coefficients of the corresponding connecting bolts of each standard section, that is, to check the stress resonance situation of the combined torque force of the connecting bolts and the wind direction, the vibration and abnormal sound situation when the connecting bolts are stressed, the degree of rust and mottling of the connecting bolts and the stress concentration situation of the crack source in its nearby area, and to check the loosening possibility of the bolts from the dimension of wind load characteristics, which helps to make targeted adjustments and improvements to the wind prevention measures of the tower crane according to the inspection situation, such as increasing wind prevention cables, adjusting the angle of the boom, etc., further enhancing the adaptability and safety of the tower crane in a harsh wind environment, ensuring that the tower crane can operate reliably under various meteorological conditions, and providing a strong guarantee for the smooth progress of the engineering project.

[0052] The tower crane bolt early warning module is used to construct a loosening tendency relationship formula for the corresponding connecting bolts of each standard section of the tower crane by combining its own vibration result characteristics and wind load influence coefficients, locate the corresponding positions of the loosening bolts, and conduct early warning evaluation on them.

[0053] In a preferred implementation manner, the content of constructing the loosening tendency relationship formula for the corresponding connecting bolts of each standard section of the tower crane is: obtain the load weight G of each starting and rotating operation during the operation cycle of the tower crane's boom at a specified stage i , and obtain the load weight G0 at the current detection moment of the tower crane's boom.

[0054] Record the torque loosening degree of the corresponding connecting bolts of each standard section as J dot→k , and obtain the self-vibration influence relationship formula of the corresponding connecting bolts of each standard section R0 represents the set reference value corresponding to the displacement stable response.

[0055] Combining its own vibration result characteristics (R trans , J dot→k ) and the wind load influence coefficient, construct a loosening tendency relationship formula for the corresponding connecting bolts of each standard section of the tower crane Where respectively represent the preset loosening tendency influence weights corresponding to the self-vibration result characteristics and the wind load influence coefficient.

[0056] In a further preferred embodiment, the corresponding position of the loose bolt is located as follows: the loose tendency relation value is obtained through the loose tendency relation formula of each connecting bolt corresponding to each standard section of the tower crane, and it is compared with the set safety value of the bolt loose tendency. The connecting bolts with loose tendency relation values exceeding the set safety value corresponding to each standard section are identified as the corresponding loose bolts of each standard section, and early warning feedback is given to their positions.

[0057] The present invention analyzes the basic load-bearing fluctuation coefficient of the position of each connecting bolt corresponding to each standard section, and combines the characteristics of its own vibration results and the wind load influence coefficient to construct the loose tendency relation formula of each connecting bolt corresponding to each standard section of the tower crane. Based on this, the corresponding position of the loose bolt is located, which helps to formulate a more accurate and effective maintenance plan according to real-time data and analysis results. Moreover, when checking the looseness of the bolts, the conditions of different load weights are considered. By analyzing the stress conditions of each standard section and connecting bolts of the tower crane under different load conditions, the structural characteristics and performance of the tower crane can be understood more deeply, thus providing a scientific basis for designing and manufacturing a safer, more reliable and more efficient tower crane.

[0058] The above content is only an example and illustration of the concept of the present invention. Those skilled in the art of the present technology can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they should all belong to the protection scope of the present invention.

Claims

1. A tower crane anti-bolt-loosening alarm system, characterized in that, The system includes: Tower crane bolt bearing analysis module, which is used to obtain the carrying and moving trajectory of the tower crane's boom and its load weight, and analyze the basic bearing fluctuation coefficient of the corresponding connection bolt positions of each standard section , and number each standard section of the tower crane as , and number the positions of each connection bolt as ; The self-vibration detection module is used to extract the number of start-up operations of the tower crane's boom during the operation cycle in the specified stage, number the start-up operation times as , analyze the characteristics of the self-vibration results, including the corresponding displacement stable response of the carrying movement trajectory of the tower crane's boom , and the torque looseness of each connecting bolt corresponding to each standard section; An external vibration detection module, which is used to detect the characteristics of wind loads and evaluate the wind load influence coefficients of the corresponding connecting bolts of each standard section from the aspects of wind direction force resonance, vibration abnormal sound, and rust mottling ; A tower crane bolt warning module, which is used to construct a loosening tendency relationship formula for each connecting bolt of each standard section of the tower crane by combining its own vibration result characteristics and wind load influence coefficients, locate the corresponding positions of the loosening bolts, and conduct warning evaluation on them.

2. The tower crane anti-bolt loosening alarm system according to claim 1, wherein The content of analyzing the basic bearing fluctuation coefficient of the positions of the corresponding connecting bolts of each standard section includes: Locate the rotation angle of each connecting bolt corresponding to the position of the tower crane boom when it moves to each standard section from the carrying movement trajectory of the tower crane boom ; Identify the center of gravity position of the load on the tower crane's boom, and then obtain the distances from it to the positions of the corresponding connecting bolts of each standard section, which are recorded as the external weight distances of the corresponding connecting bolt positions of each standard section ; Analyze the foundation bearing fluctuation coefficient at the positions of the corresponding connecting bolts for each standard section , where respectively represent the preset reference rotation angle and the reference external weight distance.

3. The anti-loosening alarm system for tower crane according to claim 2, wherein, The corresponding method for identifying the position of the center of gravity of the load on the tower crane boom is: using a high-precision scanner to perform three-dimensional scanning on the load on the tower crane boom, obtaining the contour data of the load, generating a three-dimensional model of the load, and then using three-dimensional modeling and calculation software to load and analyze the three-dimensional model of the load, and exporting the position of the center of gravity.

4. The anti-loosening alarm system for tower crane according to claim 1, characterized in that, Analyze the corresponding displacement stability response of the transportation movement trajectory of the tower crane's boom, including: obtaining the time when the tower crane's boom moves to each standard section position, comparing them with each other to calculate the rotational speed of each standard section, extracting the number of start-up operations of the tower crane's boom during the operation cycle in the specified stage, and then calculating the rotational speed of each standard section in each start-up operation in the same way ; Analyze the corresponding displacement stability response of the carrying movement trajectory of the tower crane boom , where represents the rotational speed of the th standard section during the i-th starting rotation process, represents the preset reference deviation value corresponding to the rotational speed, represents the total number of starting rotation operations.

5. The tower crane anti-bolt-loosening alarm system according to claim 1, wherein The method for obtaining the torque looseness of the corresponding connecting bolts of each standard section is: Taking the tower crane embedding point as the coordinate reference point, arbitrarily constructing a three-dimensional space coordinate system, obtaining the horizontal shear force and vertical tensile force of the corresponding connecting bolts of each standard section during each starting rotation operation of the tower crane boom within the specified stage operation cycle, multiplying them by the corresponding coordinate distance length of the preset unit torque, obtaining the horizontal torque and vertical torque of the corresponding connecting bolts of each standard section during each starting rotation operation, and importing them into the three-dimensional space coordinate system according to their coordinate distance length; Constructing the horizontal torque and vertical torque of the corresponding connecting bolts of each standard section during each starting rotation operation into a combined torque force through the vector synthesis method; Comparing the combined torque forces of the corresponding connecting bolts of each standard section during each starting rotation operation, and forming the torque force movement trajectory of the corresponding connecting bolts of each standard section, thereby identifying the torque dynamics of the corresponding connecting bolts of each standard section of the tower crane. The torque dynamics include rotational torque, axial torque, and shear torque, and then matching them with the preset torque looseness corresponding to each torque dynamics to obtain the torque looseness of the corresponding connecting bolts of each standard section.

6. The anti-loosening alarm system for tower crane according to claim 5, wherein, The content of detecting the wind direction force resonance level includes: Detecting the wind direction and wind force of each starting rotation operation of the tower crane boom within the specified stage operation cycle through a wind sensor, and importing the wind direction of each starting rotation operation into the three-dimensional space coordinate system; In a three-dimensional space coordinate system, compare the wind direction of each starting rotation operation with the corresponding coordinate direction of the combined torque force of each connecting bolt of each standard section in the corresponding starting rotation operation, obtain the wind direction force resonance angle of each connecting bolt of each standard section in each starting rotation operation, compare it with the preset reference resonance angle, and calculate the wind direction force resonance degree of each connecting bolt of each standard section of the tower crane .

7. The anti-loosening alarm system for tower cranes according to claim 6, wherein, The detection content of the vibration abnormal sound level is as follows: monitor the abnormal sound characteristics of each connecting bolt corresponding to each standard section during each start-up operation in the operation cycle of the tower crane boom at the specified stage through strain gauges, and solve the vibration abnormal sound risk factors of each connecting bolt corresponding to each standard section of the tower crane ; The content of detecting the rusty mottled level includes: collecting images of the areas near the corresponding connecting bolts of each standard section through image acquisition, detecting the crack sources in the areas near the corresponding connecting bolts of each standard section based on image recognition technology, and detecting the surface rust characteristics of the corresponding connecting bolts of each standard section of the tower crane, and taking the ratio of them to the preset reference rust characteristics to obtain the rusty mottled degree of the corresponding connecting bolts of each standard section of the tower crane; Collecting the heat source map corresponding to the crack sources in the areas near the corresponding connecting bolts of each standard section, extracting the temperature indication corresponding to the position of the crack source from the heat source map, and taking the ratio of it to the preset reference temperature indication to obtain the crack source stress concentration of the corresponding connecting bolts of each standard section; Multiply the rust mottling degree of each connecting bolt of the tower crane standard sections by the crack source stress concentration degree to obtain the mottling loosening risk factor of each connecting bolt of the corresponding standard sections .

8. A tower crane anti-bolt loosening alarm system according to claim 7, characterized in that, The content of evaluating the wind load influence coefficient of the corresponding connecting bolts of each standard section includes: Record the wind force of each start and rotation operation of the tower crane's boom during the operation cycle at the specified stage as and obtain the wind force of the tower crane's boom at the current detection moment ; Evaluate the wind load influence coefficients of the corresponding connecting bolts for each standard section .

9. The anti-loosening alarm system for tower crane according to claim 1, characterized in that, The relational expression for the loosening tendency of each connecting bolt corresponding to each standard section of the tower crane is constructed as follows: Obtain the load weight of each starting operation of the tower crane's boom during the operation cycle at a specified stage and obtain the load weight of the tower crane's boom at the current detection time ; Record the torque looseness of each connecting bolt of each standard section as , and obtain the relationship formula of the influence of the self-vibration of each connecting bolt of each standard section , represents the reference value corresponding to the set displacement stable response; Combined with the characteristics of its own vibration results Combined with the wind load influence coefficient, establish the loosening tendency relationship of each connecting bolt of each standard section of the tower crane , where respectively represent the preset characteristics of its own vibration results and the influence weights of the loosening tendency of the wind load influence coefficient 10. A tower crane anti-bolt-loosening alarm system according to claim 9, characterized in that, Locating the corresponding positions of the loose bolts, the content is as follows: Obtain the loosening tendency relation values through the loosening tendency relation formulas of the corresponding connecting bolts of each standard section of the tower crane, compare them with the set safety values of the bolt loosening tendency, identify the connecting bolts with loosening tendency relation values exceeding the set safety values for each standard section, record them as the corresponding loose bolts of each standard section, and give an early warning feedback on their positions.

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