High-stability bolt looseness early warning system

Abstract

The invention discloses a high-stability bolt looseness early warning system which comprises a bolt comparison module, an assembly body gravity center detection device, a bolt looseness detection device, an assembly body overall looseness monitoring module, an assembly fastening relation module, a looseness prediction module and a failure early warning module. The bolt looseness detection device sends a bolt fastening condition to the assembly body overall looseness monitoring module, and the assembly body gravity center detection device sends an assembly body gravity center change trend to the assembly body overall looseness monitoring module through gravity center change trend data. The assembly overall looseness monitoring module judges the deformation trend of the overall assembly through finite element data, and the looseness early warning module makes judgment and early warning according to the data. According to the system, the deformation trend problem of the fabricated building is fully considered, the self-weight of the building is used as one of consideration factors for loosening of the fastener, and meanwhile, the stress relevance of the fastener in an actual large-self-weight structure is reasonably simulated.

Description

Technical Field

[0001] The invention relates to a field, and in particular to a high-stability bolt loosening early warning system. Background Art

[0002] Prefabricated buildings refer to buildings assembled on site using prefabricated components. By splitting the designed building structure into prefabricated components and prefabricating the split prefabricated components, the prefabricated components only need to be assembled according to the design drawings during the construction of the prefabricated building, which can comprehensively improve the building quality and construction efficiency. And with the continuous improvement of design capabilities and the production level of prefabricated components, the design, component splitting and assembly effects of prefabricated buildings have been greatly improved, and prefabricated buildings have gradually been widely used.

[0003] Existing prefabricated buildings require a large number of fasteners to fasten prefabricated components according to the characteristics of prefabricated structures. Different from the anti-loosening detection of fasteners in the mechanical field, since fasteners in buildings are often subjected to greater forces and are more susceptible to metal fatigue and the weight of the building, traditional loosening warnings are difficult to meet the actual use of prefabricated buildings. That is, the anti-loosening of mechanical fasteners is mostly based on failure as the standard, but in prefabricated buildings, failure as the standard detection will cause a lag in risk handling and cause additional casualties.

[0004] Therefore, a high-stability bolt loosening early warning system is needed for use with building fasteners, which fully considers the building's deadweight and deformation characteristics. Summary of the invention

[0005] The present invention aims to solve the problem in the prior art that existing prefabricated buildings, according to the characteristics of prefabricated structures, need to use a large number of fasteners to fasten prefabricated components. Different from the anti-loosening detection of fasteners in the mechanical field, since fasteners in buildings are often subjected to greater forces and are more susceptible to metal fatigue and the self-weight of the building, the traditional loosening warning is difficult to meet the actual use of prefabricated buildings. A high-stability bolt loosening warning system is provided, which solves the above problem by introducing the deformation trend of prefabricated components.

[0006] The present invention provides a high-stability bolt loosening early warning system, comprising a bolt control module, an assembly center of gravity detection device, a bolt loosening detection device, an assembly overall loosening monitoring module, an assembly fastening relationship module, a loosening prediction module and a failure early warning module. The bolt loosening detection device detects the bolt tightening condition and sends the bolt tightening condition to the assembly overall loosening monitoring module. The assembly center of gravity detection device generates center of gravity change trend data through recent assembly center of gravity detection data and sends the assembly center of gravity change trend to the assembly overall loosening monitoring module. The assembly overall loosening monitoring module determines the overall assembly deformation trend through finite element data by retrieving the bolt force comparison relationship in the bolt comparison module and combining the bolt tightening condition and the assembly center of gravity change trend data. The loosening warning module makes judgments and warnings on the loosening conditions of each fastening node according to the force conditions of the fastening nodes of the assembly overall loosening monitoring module and the historical detection data of the bolt loosening detection device. The failure warning module compares the fastener tightening conditions of each fastening node detected by the bolt loosening detection device with the loosening threshold, and issues real-time alarms for fastening nodes that exceed the loosening threshold. The assembly tightening relationship module models the physical data of each assembled component and fastener of the assembly and provides the model finite element data to the assembly overall loosening monitoring module.

[0007] A high-stability bolt loosening early warning system described in the present invention, as a preferred method, the bolt comparison module is used to traverse all fastener nodes into a data table, select several axially symmetrical or axially closest bolts according to the shape of the fastened assembly component, associate them in the data table, and assign values ​​to the mechanical influence factors according to the distance between the associated nodes and the corresponding number on the same component, the closer the distance or the smaller the corresponding number, the larger the assigned value.

[0008] A high-stability bolt loosening warning system described in the present invention, as a preferred method, the assembly fastening relationship module is used to perform volume modeling on the prefabricated components as an assembly, and fastening nodes are added to the volume modeling of the assembly according to the fastener positions, the ideal fastening length is calculated according to the fastening surface of the fastening node, and the resistance measurement value of the bolt loosening detection device under the ideal state is output according to the ideal fastening length.

[0009] A high-stability bolt loosening early warning system described in the present invention, as a preferred embodiment, the prediction method of the loosening prediction module is: based on the result of the deformation trend of the overall assembly, the torsion trend of each fastening node position is retrieved, the weight of the assembly is decomposed in the direction of the torsion trend, the force in the direction of the torsion trend is evenly decomposed to the axial direction of the bolts of each fastening node, the bolt forces at corresponding positions are synthesized into the total force of associated fasteners and the total force of associated fasteners is redistributed according to the distance of the bolts from the center of gravity and the number of corresponding associated components on the same component, the force of each fastening node is equal to the distance assignment multiplied by the associated assignment multiplied by the total force of the associated fasteners, and the sum of the distance assignments between the associated fasteners and the sum of the associated assignments are both 1.

[0010] In the high-stability bolt loosening early warning system described in the present invention, as a preferred embodiment, the assembly center of gravity detection device is a plurality of gyroscopes arranged on key structural nodes of the assembled component.

[0011] In the high-stability bolt loosening early warning system described in the present invention, as a preferred embodiment, the bolt loosening detection device is a resistance measurement circuit with two ends respectively arranged at the bolt end and one side of the nut.

[0012] In the high-stability bolt loosening early warning system described in the present invention, as a preferred embodiment, the bolt association relationship in the data table can be transferred.

[0013] The beneficial effects of the present invention are as follows: This system fully considers the deformation trend of prefabricated buildings, takes the building's own weight as one of the considerations for fastener loosening, and reasonably simulates the correlation of the forces on fasteners in actual large-weight structures, making the force influencing factors of fastener loosening trends more reasonable. By comparing the fastener failure threshold and theoretical axial force, more accurate fastener loosening warning information can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of a high-stability bolt loosening early warning system. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Example 1

[0016] like Figure 1 As shown, a high-stability bolt loosening early warning system includes a bolt control module, an assembly center of gravity detection device, a bolt loosening detection device, an assembly overall loosening monitoring module, an assembly fastening relationship module, a loosening prediction module and a failure early warning module. The bolt loosening detection device detects the bolt tightening condition and sends the bolt tightening condition to the assembly overall loosening monitoring module. The assembly center of gravity detection device generates center of gravity change trend data through recent assembly center of gravity detection data and sends the assembly center of gravity change trend to the assembly overall loosening monitoring module. The assembly overall loosening monitoring module determines the overall assembly deformation trend through finite element data by retrieving the bolt force comparison relationship in the bolt comparison module and combining the bolt tightening condition and the assembly center of gravity change trend data. The loosening warning module makes judgments and warnings on the loosening conditions of each fastening node according to the force conditions of the fastening nodes of the assembly overall loosening monitoring module and the historical detection data of the bolt loosening detection device. The failure warning module compares the fastener tightening conditions of each fastening node detected by the bolt loosening detection device with the loosening threshold, and issues real-time alarms for fastening nodes that exceed the loosening threshold. The assembly tightening relationship module models the physical data of each assembled component and fastener of the assembly and provides the model finite element data to the assembly overall loosening monitoring module.

[0017] The bolt comparison module is used to traverse all fastener nodes into a data table, select several axially symmetrical or axially closest bolts according to the shape of the fastened assembly component, associate them in the data table, and assign values ​​to the mechanical influence factors based on the distance between the associated nodes and the corresponding number on the same component. The closer the distance or the smaller the corresponding number, the larger the assigned value.

[0018] The assembly fastening relationship module is used to perform volume modeling on the prefabricated components as an assembly, and to attach fastening nodes to the volume modeling of the assembly according to the positions of the fasteners, calculate the ideal fastening length according to the fastening surfaces of the fastening nodes, and output the resistance measurement value of the bolt loosening detection device under the ideal state according to the ideal fastening length.

[0019] The prediction method of the loosening prediction module is as follows: according to the result of the deformation trend of the overall assembly, the torsional trend of each fastening node position is retrieved, the weight of the assembly is decomposed in the direction of the torsional trend, and the force in the torsional trend direction is evenly decomposed to the bolt axial direction of each fastening node. The bolt forces at the corresponding positions are synthesized into the total force of the associated fasteners and the total force of the associated fasteners is redistributed according to the distance of the bolts from the center of gravity and the number of corresponding associated components on the same component. The force of each fastening node is equal to the distance assignment multiplied by the associated assignment multiplied by the total force of the associated fasteners. The sum of the distance assignments between the associated fasteners and the sum of the associated assignments are both 1.

[0020] The assembly center of gravity detection device is a number of gyroscopes set at the key structural nodes of the assembled components. The bolt loosening detection device is a resistance measurement circuit with two ends respectively set at the end of the bolt and one side of the nut. The bolt association relationship in the data table is transferable.

[0021] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high stability bolt loosening early warning system, characterized by: It includes a bolt control module, an assembly center of gravity detection device, a bolt loosening detection device, an assembly overall loosening monitoring module, an assembly fastening relationship module, a loosening prediction module and a failure warning module. The bolt loosening detection device detects the bolt tightening condition and sends the bolt tightening condition to the assembly overall loosening monitoring module. The assembly center of gravity detection device generates center of gravity change trend data through recent assembly center of gravity detection data and sends the assembly center of gravity change trend to the assembly overall loosening monitoring module. The assembly overall loosening monitoring module determines the overall assembly deformation trend through finite element data by retrieving the bolt force comparison relationship in the bolt comparison module and combining the bolt tightening condition and the assembly center of gravity change trend data. The loosening warning module makes judgments and warnings on the loosening conditions of each fastening node according to the force conditions of the fastening nodes of the assembly overall loosening monitoring module and the historical detection data of the bolt loosening detection device. The failure warning module compares the fastening conditions of each fastening node detected by the bolt loosening detection device with the loosening threshold, and issues real-time alarms for the fastening nodes that exceed the loosening threshold. The assembly fastening relationship module models the physical data of each prefabricated component and fastener of the assembly and provides the model finite element data to the assembly overall loosening monitoring module.

2. A high stability bolt loosening early warning system according to claim 1, characterized in that: The bolt comparison module is used to traverse all fastener nodes into a data table, select several axially symmetrical or axially closest bolts according to the shape of the fastened assembly component, associate them in the data table, and assign values ​​to the mechanical influence factors according to the distance between the associated nodes and the corresponding number on the same component. The closer the distance or the smaller the corresponding number, the larger the assigned value.

3. A high stability bolt loosening warning system according to claim 2, characterized in that: The assembly fastening relationship module is used to perform volume modeling on the prefabricated components as an assembly, and to attach fastening nodes to the volume modeling of the assembly according to the positions of the fasteners, calculate the ideal fastening length according to the fastening surfaces of the fastening nodes, and output the resistance measurement value of the bolt loosening detection device under the ideal state according to the ideal fastening length.

4. A high stability bolt loosening warning system according to claim 3, characterized in that: The prediction method of the looseness prediction module is as follows: according to the result of the deformation trend of the overall assembly, the torsional trend of each fastening node position is retrieved, the weight of the assembly is decomposed in the direction of the torsional trend, the force in the torsional trend direction is evenly decomposed to the bolt axial direction of each fastening node, the bolt forces at corresponding positions are synthesized into the total force of associated fasteners, and the total force of associated fasteners is redistributed according to the distance of the bolts from the center of gravity and the number of corresponding associated components on the same component. The force of each fastening node is equal to the distance assignment multiplied by the associated assignment multiplied by the total force of the associated fasteners, and the sum of the distance assignments between the associated fasteners and the sum of the associated assignments are both 1.

5. A high stability bolt loosening early warning system according to claim 1, characterized in that: The assembly center of gravity detection device is a plurality of gyroscopes arranged on key structural nodes of the assembled component.

6. A high stability bolt loosening early warning system according to claim 1, characterized in that: The bolt loosening detection device is a resistance measuring circuit with two ends respectively arranged at the end of the bolt and one side of the nut.

7. A high stability bolt loosening early warning system according to claim 2, characterized in that: The bolt association relationship in the data table can be transferred.

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