Monitoring device for monitoring retraction of shield hob rest

The invention discloses a monitoring device for monitoring retraction of a shield hob rest. The monitoring device comprises a hob rest, a hob rest bolt arranged on the hob rest, a hob cylinder makingcontact with the hob rest, a hob cylinder bolt arranged in the hob cylinder and an end cover arranged on the hob rest bolt. The end cover is connected with the knife rest bolt through threads, and thehob rest bolt makes contact with the hob cylinder bolt. The monitoring device has the following beneficial effects: the monitoring device has advantages of being simple in principle, convenient to install, capable of being repeatedly used, accurate, reliable and the like; a worker can master the installation state of the hob in the hob cylinder in real time and accurately judge whether the hob rest retreats or not in the tunneling process so that corresponding treatment measures can be taken in time; and high safety and efficiency of tunneling construction are guaranteed. 本发明公开了一种监测盾构滚刀刀架后退的监测装置，包括刀架，设于刀架上的刀架螺栓，与刀架相接触