Circumferential rotation limiting mechanism

Abstract

The invention discloses a circumferential rotation limiting mechanism. The limiting mechanism comprises a fixed disc, a rotating disc rotationally connected to the fixed disc, a rotating assembly enabling the rotating disc to be rotationally connected with the fixed disc, and a driving assembly used for driving the rotating disc to rotate, and a spiral limiting groove is formed in the fixed disc or the rotating disc. The limiting mechanism further comprises an idler wheel connected into the limiting groove in a rolling manner in the spiral extending direction of the limiting groove, a swing base located above the limiting groove and coaxially and fixedly connected with the idler wheel, and a rotating pin with two ends rotationally connected with the swing base and the rotating disc respectively. Physical limiting is achieved, transmission is smoother, the jamming risk is greatly reduced, the overall size of the mechanism can be reduced, and nondestructive testing in a small space is facilitated.

Description

technical field [0001] The invention belongs to the field of nuclear power detection equipment, and in particular relates to a circumferential rotation limiting mechanism. Background technique [0002] In non-destructive testing activities, when testing rotary workpieces such as shafts and cylinders, in order to achieve full coverage of the circumferential scanning range, the design of the mechanical structure often requires a circumferential motion range greater than 360° (generally at least 380° °), that is, to ensure that the probe carried on the circumferential motion mechanism has a certain scanning coverage. The previous designs often used multiple position sensors (generally there are three sensors of zero point, positive limit and negative limit) to detect the position of the circumferential movement. This method has two obvious disadvantages: 1) Due to the In general, it is necessary to arrange drag chains to accommodate cables. In some special cases, such as whe...

AI Technical Summary

Problems solved by technology

The previous designs often used multiple position sensors (generally there are three sensors of zero point, positive limit and negative limit) to detect the position of the circumferential movement. This method has two obvious disadvantages: 1) Due to the In general, it is necessary to arrange drag chains to accommodate cables. In some special cases, such as when the power is off, the rotating mechanism is artificially rotated, or the sensor is faulty, there is a possibility that the actual movement position exceeds the limit position, resulting in the surrounding The direction movement is uncontrollable, causing the drag chain and cable to break and damage the equipment

2) The radiation environment of the nuclear power plant will cause damage and interference to the circuit of the electronic sensor, and even make the sensor not work normally, which reduces the reliability of the equipment

[0003] In other fields, there are helical limiting grooves and strip grooves and rotating shafts on the opposite surfaces of two parts that rotate relatively to achieve the limiting of circumferential movement. For example, the patent application number is: 2014800038702. At this time, the rotating shaft needs to move along the helical line and also needs to move along the bar-shaped groove. The two moving directions are close to vertical, which will easily cause the tilting of the rotating rod to be stuck, and the bar-shaped groove has high requirements on the available space on the lower end surface of the rotating body.

Images