SCREW LOOSENESS MONITORING SYSTEM, SCREW REMOVAL MONITORING SYSTEM, AND SCREW LOOSENESS OR REMOVAL MONITORING SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a screw looseness monitoring system capable of ensuring safety of a communication channel, where the need for a cost of equipment such as a cable for wire communication is eliminated to reduce an installation cost.SOLUTION: A system comprises one or more washer sensors 10 (a screw looseness detecting apparatus) and a predetermined communication terminal 20. Each of the washer sensors 10 comprises a lead switch 1 (screw looseness sensing means) for sensing a looseness condition of screw fastening means having a male screw member for fastening a member to be fastened and a female screw member, and a wireless communication section 5 for wirelessly transmitting the result of the looseness condition of the screw fastening means sensed by the screw looseness sensing means to the predetermined communication terminal 20. The communication terminal 20 comprises a transmit/receive antenna 65 for receiving the transmission, a communication processing apparatus 64, and display means 61 for displaying the looseness condition sensing result of the screw fastening means received via the communication processing apparatus 64. The lead switch 1 (screw looseness sensing means) comprises a magnetic sensor for sensing screw looseness according to change in a surrounding magnetic field environment.SELECTED DRAWING: Figure 1