CN110836745A - Intelligent bolt assembly and measuring method - Google Patents
Intelligent bolt assembly and measuring method Download PDFInfo
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- CN110836745A CN110836745A CN201810934897.3A CN201810934897A CN110836745A CN 110836745 A CN110836745 A CN 110836745A CN 201810934897 A CN201810934897 A CN 201810934897A CN 110836745 A CN110836745 A CN 110836745A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/24—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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Abstract
An intelligent bolt assembly and a measuring method comprise the following steps: the pre-tightening force sensing unit and the data processing module; the pre-tightening force sensitive unit is connected with the data processing module through a lead; the pretightening force sensitive unit is arranged between a nut and a nut of the bolt and is used for measuring the pretightening force of the bolt; and the data processing module acquires a signal of the pretightening force sensitive unit and sends the signal to an intelligent bolt reading and writing device. The monitoring device provided by the invention can be arranged on a tower in a construction stage, the pretightening force can be monitored after the bolts are fastened, the number of the bolts on the tower is counted, the monitoring and management of the bolt fastening quality in the tower assembling process on the tower construction site are realized, and the inspection workload is reduced.
Description
Technical Field
The invention relates to on-line monitoring of a power transmission line, in particular to an intelligent bolt assembly and a measuring method.
Background
At present, an extra-high voltage power transmission and transformation project is in a critical period of construction, an assembled iron tower is used as an important link of the extra-high voltage line project construction, and safety and reliability of parts in the iron tower in the construction process, particularly bolted connection, have important influence on the safety and quality of the extra-high voltage project construction. A large number of bolts are arranged on each iron tower and limited by construction conditions, the fastening process of the bolts is still screwed up manually, the influence of human factors is large, whether the neglected installation condition exists in the bolts can not be checked, the fastening consistency of each bolt can not be guaranteed, and after construction is finished, the construction quality of the bolts can not be checked. After the power transmission line is put into operation after being constructed, the iron tower is used as an important component of a power grid, is wide in regional distribution and complex in operation condition, is easily influenced by natural environment and external force, and under the influence of factors such as strong wind, breeze vibration, conductor icing waving and the like, bolts of the tower are often loosened and even fall off, so that accidents such as conductor falling, tower inclination, tower falling and the like are finally caused, and huge hidden dangers are buried in safe and stable operation of the power grid.
Therefore, effective monitoring needs to be performed on the line environment, the number of towers in the power transmission line is large, the stress condition is complex, the bolt inspection is still performed through a visual method in the line inspection process, an effective means is lacked, abnormal conditions such as falling of the bolt on the tower and insufficient pretightening force are rapidly and accurately found, the inspection workload is increased, and the construction requirement of the smart power grid is difficult to meet.
Disclosure of Invention
The invention provides an intelligent bolt assembly and a measuring method, and aims to solve the problems that the falling of a bolt on a tower, the lack of pretightening force and the large inspection workload are difficult to find in time in the prior art.
The technical scheme provided by the invention is as follows: a smart bolt assembly comprising: the pre-tightening force sensing unit and the data processing module;
the pre-tightening force sensitive unit is connected with the data processing module through a lead;
the pretightening force sensitive unit is arranged between a nut and a nut of the bolt and is used for measuring the pretightening force of the bolt;
and the data processing module acquires a signal of the pretightening force sensitive unit and sends the signal to an intelligent bolt reading and writing device.
Preferably, the pretightening force sensing unit is a hollow annular structure, is sleeved on a screw rod of a bolt, and comprises:
the device comprises an upper shell, a lower shell and a protective layer;
the inner part of the upper shell is an annular membrane-shaped stress structure, and a strain gauge is arranged on the annular membrane-shaped stress structure;
the protective layer is sandwiched between the upper case and the lower case.
Preferably, the number of the strain gauges is 4, and a Wheatstone bridge structure is formed for measuring the voltage change between any two end bridges.
Preferably, the protective layer is a rubber gasket.
Preferably, the data processing module includes: the system comprises an analog-digital unit, an embedded processor and a communication unit;
the analog-digital unit and the communication unit are respectively electrically connected with the embedded processor;
the analog-digital unit is connected with the strain gauge through a lead to acquire a voltage signal of the strain gauge;
the modulus unit includes: the signal amplification circuit amplifies the voltage signal; the analog-to-digital conversion circuit converts the voltage signal into a voltage digital signal;
the embedded processor converts the received voltage digital signal into pretightening force data and sends the pretightening force data to the communication unit;
the communication unit generates a data packet by the received data and preset inherent information according to a set communication protocol, and sends the data packet to the intelligent bolt reading and writing device;
wherein the inherent information includes: specification type, grade, mounting position and bolt material of the bolt.
Preferably, the data processing module further includes: the device comprises a power management unit, a temperature and humidity monitoring unit and a vibration monitoring unit;
the power management unit includes: a battery and a pulse trigger switch;
the temperature and humidity monitoring unit comprises: a temperature and humidity sensor; the temperature and humidity sensor measures the temperature and the humidity of the environment;
the vibration monitoring unit includes: and the acceleration sensor monitors the vibration signal of the position where the data processing module is located.
Preferably, the environment temperature, humidity and vibration signals generate environment temperature, humidity and vibration data through an analog-digital unit and an embedded processor;
and the environment temperature and humidity data and the vibration data are transmitted to the intelligent bolt read-write device through the data packet generated by the communication unit according to the preset frequency.
Preferably, the intelligent bolt assembly further comprises: and the antenna is arranged on the surface of the data processing module and is electrically connected with the communication unit for forwarding the data packet.
Preferably, the antenna is a radio frequency identification antenna.
Based on the same invention concept, the invention also provides an intelligent bolt reading and writing device, which comprises: a radio frequency transceiver and a man-machine interaction module;
the radio frequency transceiver is electrically connected with the human-computer interaction module;
the radio frequency transceiver sends radio frequency signals to the intelligent bolt assembly and receives data packets sent by an antenna of the intelligent bolt assembly;
the human-computer interaction module is used for: the received operation instruction is used for calculating a standard value of the pretightening force based on the diameter of the bolt and the parameters of the bolt material, obtaining bolt loosening information based on the standard value of the pretightening force, pretightening force data in the data packet and a threshold value, and displaying intelligent bolt assembly information and bolt loosening information in the data packet.
Preferably, the device is a handheld reader-writer or an intelligent terminal.
Based on the same invention concept, the invention also provides a measuring method of the intelligent bolt assembly, which comprises the following steps:
the data processing module performs analog-to-digital conversion processing on the pretightening force of the bolt measured by the pretightening force sensitive unit and generates a data packet;
and displaying the data packet.
Preferably, the displaying the data packet includes:
analyzing the data packet to obtain pretightening force data, an installation position, a bolt specification model and a bolt material;
acquiring the diameter of the bolt and the parameters of the bolt material based on the specification model of the bolt;
calculating a standard value of the pretightening force based on the diameter of the bolt and the parameters of the bolt material;
when the difference between the pretightening force data and the standard value of the pretightening force is not less than a threshold value, the loosening of the bolt needs to be processed, and a loosening mark is marked, otherwise, the loosening mark is not marked;
and displaying the mounting position and the loosening mark.
Preferably, the standard value of the pretightening force is calculated based on the diameter of the bolt and the parameters of the bolt material, and is shown as the following formula:
in the formula: f': marking the pre-tightening force; sigmas: parameters of the bolt material; d: bolt diameter.
Compared with the prior art, the invention has the beneficial effects that:
the technical scheme provided by the invention comprises a pretightening force sensitive unit and a data processing module; the pre-tightening force sensitive unit is connected with the data processing module through a lead; the pretightening force sensitive unit is arranged between a nut and a nut of the bolt and is used for measuring the pretightening force of the bolt; the data processing module acquires a signal of the pretightening force sensitive unit and sends the signal to the intelligent bolt reading and writing device, the monitoring device can be installed on a tower in the construction stage, the pretightening force can be monitored after the bolts are fastened, the number of the bolts on the tower is counted, the monitoring and management of the fastening quality of the bolts in the tower assembling process in the tower construction site are realized, the real-time monitoring of the pretightening force of the bolts in the later line inspection process is realized, and the inspection workload is reduced.
According to the technical scheme provided by the invention, the monitoring management of the whole life cycle of the tower is realized by monitoring the bolts on the tower.
According to the technical scheme provided by the invention, the environment condition of the power transmission line can be monitored by the temperature and humidity monitoring unit, on one hand, whether the bolt is in a humid environment or not can be monitored, the bolt can rust and fall off due to the fact that the bolt is in the humid environment, and on the other hand, the situations that the conductor is iced and waved under the influence of natural conditions such as temperature, humidity and rainfall are prevented.
The technical scheme provided by the invention is provided with the embedded processor, has the bolt pretightening force calculation capability, can acquire pretightening force data in real time, integrates the temperature, humidity and vibration monitoring functions, and realizes the integrated monitoring of the power transmission line channel environment where the tower is located.
According to the technical scheme provided by the invention, the bolt pretightening force, the temperature and humidity and the vibration numerical values are sent through the RFID, read by the handheld reader-writer, intelligently distinguished and displayed in real time, and the number of the bolts is counted, so that the pretightening force of each bolt and the environment condition of a power transmission channel are intuitively reflected.
According to the technical scheme provided by the invention, the handheld reader-writer is provided with a pre-tightening force reading and displaying program, and different pre-tightening force threshold values are set according to different line design specifications and construction requirements, bolt materials and diameters thereof in the judging process.
According to the technical scheme provided by the invention, the design is based on standard bolts, the limitation of installation conditions is avoided, the pretightening force sensitive unit is designed by adopting an annular film-shaped sensitive structure, and the quantity of the bolts can be rapidly and accurately counted and the pretightening force of the bolts can be measured by reasonably arranging and bridging strain gauges.
Drawings
FIG. 1 is a schematic structural diagram of a bolt measuring device according to the present invention;
FIG. 2 is a top view of the pretension-sensitive unit of the present invention;
FIG. 3 is a schematic diagram of the internal structure of the data processing module according to the present invention;
1-an upper shell of the pre-tightening force sensitive unit; 2-bolt; 3-a strain gauge; 4-a lower pretightening force sensitive unit shell; 5-a data processing module; 6-an RFID antenna; 7-hand-held reader-writer; 8-a power management unit; 9-a temperature and humidity monitoring unit; 10-a vibration monitoring unit; 11-a modulus unit; 12-an embedded processor; 13-a communication unit.
Detailed Description
For a better understanding of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings and examples.
The invention provides an intelligent bolt capable of rapidly counting the number of bolts and monitoring pretightening force aiming at fastening bolts on a transmission tower. In the process of assembling the tower, the intelligent device is additionally arranged on the common bolt to replace a gasket for fastening the iron tower rod piece. The device has the RFID chip to integrated temperature and humidity sensor and vibration sensor through Radio Frequency Identification (RFID) technique, with the quick scanning of bolt quantity, in gathering the condition such as the pretightning force that receives and the environment humiture, the vibration of circuit place to the handheld read write line simultaneously, and have the position information of bolt on the shaft tower, realize that the bolt is checked fast and can carry out the real-time supervision of pretightning force and shaft tower surrounding environment. So as to realize iron tower assemblage construction acceptance and later stage and patrol and examine intellectuality, prevent to lead to the fact the shaft tower slope, empty because of the bolt drops, finally realize the full life cycle monitoring of shaft tower.
Example 1:
as shown in fig. 1, the smart bolt assembly includes: the device comprises a pretightening force sensitive unit 1 and an external data processing module 5 which are arranged below a nut, wherein the data processing module 5 is arranged on a support or any fixed object for fixing the nut or bolt of the pretightening force sensitive unit 1.
The bolt body and the nut do not belong to the structure to be protected, and the intelligent bolt assembly is suitable for bolt bodies and nuts of any type.
When the tower is assembled, the pretightening force sensitive unit replaces a gasket, is arranged between the tower node plate and a nut of the bolt, and then the bolt is fastened in sequence. A rubber gasket is clamped between the upper shell and the lower shell of the pretightening force sensitive unit, the pretightening force sensitive unit can be effectively prevented from being damaged by water immersion after being fixed, and can be used as a limiting protective layer to prevent the pretightening force from exceeding a measurement range to cause plastic deformation of the sensitive unit.
As shown in FIG. 2, an annular membrane-shaped stress sensitive structure is formed inside the upper shell, and the strain gauge 3 is attached, so that in the bolt fastening process, the pre-tightening force sensitive unit is pressed to generate micro-strain, and the resistance value of the strain gauge chip is changed. The strain chips are arranged on the membrane structure in longitudinal and transverse pairwise symmetry and are connected in a Wheatstone full-bridge manner, so that the influence of environmental temperature errors is eliminated while the measurement sensitivity is increased. After passing through the current, the voltage at two ends of the bridge can be slightly changed, so that the magnitude of the pre-tightening force is reflected.
The intelligent bolt assembly further comprises: the data transmission module 6 is an RFID antenna, and the data display module 7 is a handheld reader-writer. After the intelligent bolt is screwed down, the intelligent bolt is connected to the data processing module 5, and then the intelligent bolt can be electrified and operated. The weak voltage signal in the bridge is sent to a data processing module for further amplification, processing and analysis, and is sent to a communication unit 13 through an embedded processor (MCU)12, and finally the pretightening force data is read by a handheld reader-writer 7 through an RFID antenna 6.
As shown in fig. 3, the main functions of each part of the data processing module are described as follows:
the power management unit 8 comprises a battery and a control circuit thereof, supplies power to each module of the intelligent bolt assembly, manages the battery, is provided with a pulse trigger switch in the control circuit, and awakens the battery to supply power to the intelligent bolt assembly when the pulse trigger switch receives a signal transmitted by the RFID handheld reader-writer, so that the electric quantity is further saved.
Temperature and humidity sensors are arranged in the temperature and humidity monitoring unit 9 as required, and the temperature and humidity of the environment of the current transmission channel can be sent to the MCU for monitoring the surrounding environment of the tower.
The vibration monitoring unit 10 is internally provided with an acceleration sensor as required, can monitor the vibration of the fixed position of the data processing unit, and sends the vibration condition to the MCU, and monitors the vibration condition of the tower as required.
The analog-to-digital unit 11 includes a signal amplification circuit, an analog-to-digital conversion circuit, and the like. And weak voltage signals, temperature, humidity and vibration signals generated by the pretightening force sensitive unit are converted into digital signals capable of being processed by the embedded processor, so that pretightening force monitoring is performed.
Embedded processor 12 (MCU): and the intelligent bolt control core is responsible for running a data processing program and controlling to send the pretightening force data to the RFID module.
The communication unit 13 packages the pre-tightening force, the temperature, the humidity and the vibration data processed by the MCU according to a communication protocol, so that the handheld reader can conveniently read the data.
After the intelligent bolt is installed, when engineering is accepted, an acceptance person scans the RFID antenna 6 through the handheld reader-writer 7 or the RFID reader-writer to read bolt information in batches, can read the pretightening force numerical value, the environment temperature and humidity numerical value and the vibration condition into the reader-writer and display the pretightening force numerical value, the environment temperature and humidity numerical value and the vibration condition in real time, and simultaneously count the number of bolts, read the current bolt pretightening force and integrate the environment temperature and humidity and the vibration condition as required, so that the size of the pretightening force borne by each bolt and the environment condition of a power transmission channel are directly reflected, and the. The RFID reader/writer (Radio frequency identification, RFID) in this embodiment is also called an RFID reader, that is, Radio frequency identification.
The handheld reader-writer is provided with a pre-tightening force reading and displaying program, and the pre-tightening force threshold value is set during judgment according to different circuit design specifications and construction requirements, bolt materials and nominal diameters thereof.
Manual selection of a bolt material parameter sigma in a program as a function of the field situationsAnd the diameter d is determined according to a pretightening force discrimination formula:
and feeding back whether the pretightening force F' meets the requirement or not in real time, and automatically checking the pretightening force requirement to realize the full-flow digital intelligent construction from design to acceptance in the field of capital construction. After the transportation and the transportation are inspected, the operation and maintenance personnel can also grasp the pretightening force of the bolt and the change of the environment where the tower is located in real time through the handheld reader-writer when in inspection, and the bolt is effectively prevented from loosening and slipping.
In this embodiment, the data transmission module may further collect the bolt pretensioning force data processed by the MCU on the whole tower to the data concentrator by a wireless networking method based on the ieee802.15.4 standard and transmit the bolt pretensioning force data to the monitoring platform by a 4G signal.
This embodiment also provides an intelligence bolt readwrite device, includes: a radio frequency transceiver and a man-machine interaction module;
the radio frequency transceiver is electrically connected with the human-computer interaction module;
the radio frequency transceiver sends radio frequency signals to the intelligent bolt assembly and receives data packets sent by an antenna of the intelligent bolt assembly;
the human-computer interaction module is used for: the received operation instruction is used for calculating a standard value of the pretightening force based on the diameter of the bolt and the parameters of the bolt material, obtaining bolt loosening information based on the standard value of the pretightening force, pretightening force data in the data packet and a threshold value, and displaying intelligent bolt assembly information and bolt loosening information in the data packet.
In an embodiment, the device is a handheld reader-writer or an intelligent terminal.
Example 2:
based on the same concept, the embodiment further provides a bolt measuring method, which includes:
the data processing module performs analog-to-digital conversion processing on the pretightening force of the bolt measured by the pretightening force sensitive unit and generates a data packet;
and displaying the data packet.
In an embodiment, the displaying the data packet includes:
analyzing the data packet to obtain pretightening force data, an installation position, a bolt specification model and a bolt material;
acquiring the diameter of the bolt and the parameters of the bolt material based on the specification model of the bolt;
calculating a standard value of the pretightening force based on the diameter of the bolt and the parameters of the bolt material;
when the difference between the pretightening force data and the standard value of the pretightening force is not less than a threshold value, the loosening of the bolt needs to be processed, and a loosening mark is marked, otherwise, the loosening mark is not marked;
and displaying the mounting position and the loosening mark.
In an embodiment, the pre-tightening force index is calculated based on the bolt diameter and the bolt material parameter, as shown in the following formula:
in the formula: f': marking the pre-tightening force; sigmas: parameters of the bolt material; d: bolt diameter.
It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (14)
1. An intelligent bolt assembly, comprising: the pre-tightening force sensing unit and the data processing module;
the pre-tightening force sensitive unit is connected with the data processing module through a lead;
the pretightening force sensitive unit is arranged between a nut and a nut of the bolt and is used for measuring the pretightening force of the bolt;
and the data processing module acquires a signal of the pretightening force sensitive unit and sends the signal to an intelligent bolt reading and writing device.
2. The intelligent bolt assembly of claim 1, wherein the pretension-sensitive unit is a hollow ring-shaped structure and is sleeved on a screw rod of the bolt, and the pretension-sensitive unit comprises:
the device comprises an upper shell, a lower shell and a protective layer;
the inner part of the upper shell is an annular membrane-shaped stress structure, and a strain gauge is arranged on the annular membrane-shaped stress structure;
the protective layer is sandwiched between the upper case and the lower case.
3. The smart bolt assembly of claim 2, wherein the number of strain gages is 4, making up a wheatstone bridge configuration for measuring voltage changes between any two terminal bridges.
4. The smart bolt assembly of claim 2, wherein the protective layer is a rubber washer.
5. The smart bolt assembly of claim 2, wherein the data processing module comprises: the system comprises an analog-digital unit, an embedded processor and a communication unit;
the analog-digital unit and the communication unit are respectively electrically connected with the embedded processor;
the analog-digital unit is connected with the strain gauge through a lead to acquire a voltage signal of the strain gauge;
the modulus unit includes: the signal amplification circuit amplifies the voltage signal; the analog-to-digital conversion circuit converts the voltage signal into a voltage digital signal;
the embedded processor converts the received voltage digital signal into pretightening force data and sends the pretightening force data to the communication unit;
the communication unit generates a data packet by the received data and preset inherent information according to a set communication protocol, and sends the data packet to the intelligent bolt reading and writing device;
wherein the inherent information includes: specification type, grade, mounting position and bolt material of the bolt.
6. The smart bolt assembly of claim 5, wherein the data processing module further comprises: the device comprises a power management unit, a temperature and humidity monitoring unit and a vibration monitoring unit;
the power management unit includes: a battery and a pulse trigger switch;
the temperature and humidity monitoring unit comprises: a temperature and humidity sensor; the temperature and humidity sensor measures the temperature and the humidity of the environment;
the vibration monitoring unit includes: and the acceleration sensor monitors the vibration signal of the position where the data processing module is located.
7. The intelligent bolt assembly of claim 6, wherein the ambient temperature, humidity and vibration signal is generated by an analog-to-digital unit and an embedded processor to generate ambient temperature, humidity data and vibration data;
and the environment temperature and humidity data and the vibration data are transmitted to the intelligent bolt read-write device through the data packet generated by the communication unit according to the preset frequency.
8. The smart bolt assembly of claim 1, further comprising: and the antenna is arranged on the surface of the data processing module and is electrically connected with the communication unit for forwarding the data packet.
9. The smart bolt assembly of claim 8, wherein the antenna is a radio frequency identification antenna.
10. An intelligent bolt read-write device, comprising: a radio frequency transceiver and a man-machine interaction module;
the radio frequency transceiver is electrically connected with the human-computer interaction module;
the radio frequency transceiver sends radio frequency signals to the intelligent bolt assembly and receives data packets sent by an antenna of the intelligent bolt assembly;
the human-computer interaction module is used for: the received operation instruction is used for calculating a standard value of the pretightening force based on the diameter of the bolt and the parameters of the bolt material, obtaining bolt loosening information based on the standard value of the pretightening force, pretightening force data in the data packet and a threshold value, and displaying intelligent bolt assembly information and bolt loosening information in the data packet.
11. The intelligent bolt reader-writer device according to claim 10, wherein the device is a handheld reader-writer or an intelligent terminal.
12. A method of measuring a smart bolt assembly, comprising:
the data processing module performs analog-to-digital conversion processing on the pretightening force of the bolt measured by the pretightening force sensitive unit and generates a data packet;
and displaying the data packet.
13. The measurement method of claim 12, wherein said exposing the data packet comprises:
analyzing the data packet to obtain pretightening force data, an installation position, a bolt specification model and a bolt material;
acquiring the diameter of the bolt and the parameters of the bolt material based on the specification model of the bolt;
calculating a standard value of the pretightening force based on the diameter of the bolt and the parameters of the bolt material;
when the difference between the pretightening force data and the standard value of the pretightening force is not less than a threshold value, the loosening of the bolt needs to be processed, and a loosening mark is marked, otherwise, the loosening mark is not marked;
and displaying the mounting position and the loosening mark.
14. The method of claim 13, wherein the pre-load index is calculated based on the bolt diameter and a bolt material parameter as follows:
in the formula: f': marking the pre-tightening force; sigmas: parameters of the bolt material; d: bolt diameter.
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| CN201810934897.3A CN110836745A (en) | 2018-08-16 | 2018-08-16 | Intelligent bolt assembly and measuring method |
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| CN201810934897.3A CN110836745A (en) | 2018-08-16 | 2018-08-16 | Intelligent bolt assembly and measuring method |
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| CN111562046A (en) * | 2020-06-17 | 2020-08-21 | 潘欢悦 | Stud bolt for iron tower frame, assembly for measuring axial force of stud bolt and measuring method |
| WO2021253348A1 (en) * | 2020-06-17 | 2021-12-23 | 潘欢悦 | Double-end bolt for iron tower frame, assembly for measuring axial force thereof, and measuring method |
| CN112213361A (en) * | 2020-09-04 | 2021-01-12 | 国网浙江省电力有限公司丽水供电公司 | Device and method for monitoring corrosion and looseness of bolt of power transmission tower |
| CN112213361B (en) * | 2020-09-04 | 2022-08-12 | 国网浙江省电力有限公司丽水供电公司 | Device and method for monitoring corrosion and looseness of bolt of power transmission tower |
| CN115031872A (en) * | 2021-02-25 | 2022-09-09 | 中国航发商用航空发动机有限责任公司 | Supporting interface force testing device of aircraft engine rotor |
| CN114061819A (en) * | 2021-10-20 | 2022-02-18 | 广州建筑股份有限公司 | Scaffold fastener tightening torque monitoring device |
| CN114441084A (en) * | 2022-01-04 | 2022-05-06 | 中国煤炭科工集团太原研究院有限公司 | Diagnosis method, device and system for reliable connection of cantilever section and rack of heading machine |
| CN115219093A (en) * | 2022-07-06 | 2022-10-21 | 国网福建省电力有限公司经济技术研究院 | Foundation bolt working state early warning device and method for tower erection construction |
| CN115070661A (en) * | 2022-07-19 | 2022-09-20 | 重庆大学 | Bolt fastening load intelligent control monitoring system and application method thereof |
| CN115070661B (en) * | 2022-07-19 | 2024-07-16 | 重庆大学 | Intelligent control and monitoring system for bolt fastening load and application method thereof |
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