On-line device for combined sensing of bolt tightening state by piezoelectric element and resistance strain gauge
A technology of resistance strain gauge and piezoelectric element, which is applied in the field of bolt tightening detection device, piezoelectric element and resistance strain gauge composite sensing bolt tightening and loosening on-line detection device, which can solve the problem of manual participation, difficult monitoring of working conditions, Low monitoring frequency and other problems, to achieve the effect of easy monitoring and avoiding equipment damage
Active Publication Date: 2022-02-22
CHINA JILIANG UNIV +1
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Problems solved by technology
[0004] In order to overcome the shortcomings of existing detection methods such as the need for manual participation in the monitoring process, the difficulty of monitoring under harsh working conditions, and the low monitoring frequency, the present invention proposes a composite induction bolt tightening and loosening detection method for piezoelectric elements and resistance strain gauges. It can be easily applied to on-site detection, and can detect the connection status of the target bolts in real time, and at the same time transmit the monitored information back to the receiving end in a wireless manner, and give an alarm prompt at the remote receiving end for data exceeding the threshold In this way, it is very convenient to monitor the status of a large number of bolts, so that loose bolts can be found and repaired in time
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[0026] The present invention is further explained below in conjunction with the accompanying drawings.
[0027] Please refer to figure 1 and figure 2 As shown, the bolt connecting group, the upper workpiece 6, the lower workpiece 7, and the pressure tension sensor, the bolt connecting group includes bolts 1 and nut 2, and the bolt 1 is opened on the side of the screw portion. There are two ladle holes; The force sensor includes a pressure tension sensor structure and a pressure tension sensor controller, and the pressure tension sensor structure includes a first spacer and a second pad; the workpiece 6, the workpiece 7, the first pad, Both the second gasket belt with a bolt hole 18, and the bolt 1 passes through the second gasket from the bottom to the upper, down the workpiece 7, and the working member 6 and the first gasket are fastened to the nut 2 set; specifically, A gasket and the second spacer are disposed on the surface of the upper workpiece 6 and the lower hand member 7,...
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The invention discloses an online device and method for compositely sensing the tightening state of a bolt by a piezoelectric element and a resistance strain gauge. The bolts pass through the second gasket, the upper and lower workpieces, and the first gasket and are tightly connected with the nut set; the first and second gaskets have the same structure, both of which include gasket structural steel parts and piezoelectric ceramic sheets; gasket structural steel parts It is a cylinder, and the voltage ceramic sheet is installed on the middle step; the gasket structural steel part is provided with a pin hole on the side of the lower cylinder, and the pin penetrates through the pin hole and then inserted into the hole groove of the bolt; the second gasket structural steel part A resistance strain gauge bridge is installed on the side of the cylinder, and a pressure measuring force sensor controller is also installed on the first gasket. electrical connection. The invention can realize the real-time monitoring of the bolt connection group, saves the time originally required to go to the site for monitoring, and can easily monitor, detect and give an alarm in harsh environments.
Description
Technical field [0001] The present invention relates to a bolt tightening apparatus and method in the field of bolt connection state monitoring, more particularly, to a piezoelectric element and a resistance strainable sheet composite sensing bolt tightening and loose online detecting apparatus and method. Background technique [0002] The application of bolt coupling in engineering is very wide, affected by working conditions, the load in which bolts carried during use often fluctuate, affected, inevitable, some bolts, bolts, key parts Loosen often cause damage to equipment and safety accidents. However, although there are many detection methods for bolt connection conditions, such as torque wrought, patch light bulge, acoustic elasticity, resistance strainable tablets, but they need to observe the staff before watching, time consuming Some are harsh use conditions that are not conducive to on-site use. [0003] With the development of bolt connection status detection technology...
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IPC IPC(8): G01L1/25G01L1/22G08C17/02
CPCG01L1/255G01L1/22G08C17/02
Inventor 李青彭明众施阁金卫良林正童仁园孙叶青高攀
Owner CHINA JILIANG UNIV