Safe extracting device for electric barring gear

Abstract

The invention discloses a safe extracting device for an electric barring gear, which mainly comprises a case, a drive shaft, a worm and gear driving device, a pinion, a gear and a torsion coil. The worm and gear driving device is connected with the drive shaft in a transmission mode, the torsion coil is fixedly connected with the drive shaft, and the external surface of the drive shaft is provided with a thread. The pinion can be movably arranged on the drive shaft, and the center of the pinion is provided with a screw hole matched with the thread. One side of the pinion adjacent to the gear is provided with a forward hook, the pinion is also provided with a backward hook, and the forward hook and the backward hook are respectively located on both sides of pinion teeth. A rack is arrangedon the case on the extracting side of the pinion, and the rack is matched with the pinion and the backward hook. The case is also provided with a detecting device used for detecting the displacement of the pinion. The safe extracting device for electric barring gear can ensure the pinion to be engaged with or extracted from the gear more quickly, efficiently, safely and smoothly.

Description

technical field [0001] The invention relates to a device for improving the performance of an electric barring of a steam turbine, in particular to a safety exit device for an electric barring. Background technique [0002] Before the steam turbine starts running and after stopping, it is necessary to start the barring device to drive the main shaft of the steam turbine to rotate slowly, so as to eliminate the bending deformation of the rotor caused by the temperature difference. After the steam turbine starts running, that is, after the main engine is officially put into operation, the small gear of the barring device must completely withdraw from the meshing with the large gear on the steam turbine rotor, and be in a safe and fixed state. [0003] The power of most electric barring devices is the motor, and the speed of the motor is relatively high. The power is transmitted to the drive shaft through the worm gear reducer. At this time, the speed is reduced to 20-30r / min. T...

AI Technical Summary

Problems solved by technology

[0004] When cranking is over, the motor power is cut off, the main shaft of the steam turbine will move in vain, and the large gear will continue to rotate inertially in the direction of cranking. For the small gear and the large gear, the original active-passive relationship will be changed, and the small gear is driven by the driving wheel. It becomes a driven wheel. Since the transmission shaft is stationary at this time, the pinion rotates along the trapezoidal thread, gradually leaves the torque plate and the large gear, and finally stops at a position just off the large gear or at a random position, and the position where the pinion exits does not It is not fixed, and the hook of the small gear is in a random position. Due to improper operation of the user and some other reasons, there are accidents where the hook is hit by the big gear on the rotor, which damages the turning device and is critical to the safe operation of the main engine. a hidden danger

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