Flexible pipe diameter on-line monitoring system based on laser displacement sensor

The invention discloses a flexible pipe diameter on-line monitoring system based on a laser displacement sensor. The system comprises a mechanical device and a measurement and control system, whereinthe mechanical device comprises an upper part transmission mechanism and a lower part transmission mechanism. The flexible pipe diameter on-line monitoring system based on the laser displacement sensor has the advantages that (1) the provided diameter monitoring system solves the problem of larger error caused by the contact-type measurement of the flexible pipe; (2) an alignment scheme provided by the system is simple and practical, and nom-stop on-line monitoring can be achieved; (3) the diameter measuring steps provided by the system can be performed several times in time quantum, thereby the error caused during workpiece running is effectively reduced; (4) the flexible pipe diameter on-line monitoring system based on the laser displacement sensor can also be used in the monitoring of diameters of other high-pr