CN-116006280-B - Jigger device of steam turbine generator

Abstract

The invention particularly relates to an emergency jigger device of a steam turbine generator, which comprises a motor, a speed reducer and a transmission box which are sequentially connected along a power transmission direction, wherein a pawl is arranged at the bottom of the transmission box and can horizontally slide relative to the transmission box so as to drive a ratchet wheel of the steam turbine generator to intermittently rotate. The emergency jigger device of the steam turbine generator can be installed within half an hour, the function of jigging the rotor is realized, the overhaul efficiency is high, the safety is good, and the operation can be completed by a single person.

Inventors

• SHI JIABAO
• LI HAORAN
• DU YANGYANG
• CHEN NIANSHI
• WENG YUNFENG
• HUANG HUIMIN
• ZHU KEHAO
• He nian

Assignees

• 中核核电运行管理有限公司
• 秦山核电有限公司

Dates

Publication Date

20260512

Application Date

20211022

Claims (9)

1. 1. The emergency jigger device for the turbo generator is characterized by comprising a motor (1), a speed reducer (2) and a transmission case (3) which are sequentially connected along a power transmission direction, wherein a pawl (31) is arranged at the bottom of the transmission case (3), the pawl (31) can horizontally slide relative to the transmission case (3) and is used for driving a ratchet wheel (4) of the turbo generator to intermittently rotate, an upper sliding block (33), a gear set (34) and a lower sliding block (35) which are sequentially connected from top to bottom are arranged in a shell (32) of the transmission case (3), a rack matched with the gear set (34) is arranged below the upper sliding block (33), a rack matched with the gear set (34) is arranged above the lower sliding block (35), the pawl (31) is fixedly connected below the lower sliding block (35), the upper sliding block (33) is in transmission connection with an output shaft of the speed reducer (2) so that the upper sliding block (33) can move left and right, the upper sliding block (33) is eccentrically arranged in the shell (32), the upper sliding block (33) is rotated by virtue of an eccentric shaft so that the upper sliding block (33) can linearly move to the lower sliding block (35), thereby driving the pawl (31) to slide left and right.
2. 2. The turbo-generator emergency jigger device of claim 1, wherein the gear set (34) comprises meshed first (341) and second (342) gears.
3. 3. The turbo-generator emergency jigger device of claim 2, wherein the first gear (341) and the second gear (342) are the same size.
4. 4. The turbo-generator emergency jigger device as claimed in claim 1, characterized in that the gearbox (3) further comprises a connection plate (36), the connection plate (36) being flush with the top of the gear set (34).
5. 5. The turbo generator emergency jigger device according to claim 4, characterized in that a support seat (37) is detachably connected below the connection plate (36).
6. 6. The emergency jigger device for a turbo generator according to claim 5, wherein the supporting seat (37) is arched, and a bolt hole (372) is provided on a foot (371) of the supporting seat (37).
7. 7. The turbo generator emergency jigger device according to claim 1, characterized in that the horizontal sliding travel of the pawl (31) is 50-100mm.
8. 8. The turbo generator emergency jigger device according to claim 1, characterized in that the number of trips per minute of the pawl (31) is 20-22.
9. 9. The turbo generator emergency jigger device according to claim 1, characterized in that the rotation speed of the ratchet wheel (4) is in the range of 0.3-0.5r/min.

Description

Jigger device of steam turbine generator Technical Field The invention relates to the technical field of maintenance of turbogenerators, in particular to a jigger device of a turbogenerator. Background The turbine jigger is a very critical device in a power station host, and is a driving device for driving a shafting to rotate before and after the unit is started and stopped. Before the turbine is rotated, the jigger drives the shafting to rotate continuously at low speed, so as to check whether the turbine has starting conditions, such as whether the dynamic and static parts are rubbed, the bending of the main shaft is normal, and the like. More importantly, the permanent heat bending phenomenon of the steam turbine rotor can be avoided by ensuring that the steam turbine rotor is continuously cooled by being coiled in a hot state after the steam turbine is stopped. The main jigger of a certain steam turbine is imported from abroad, the control logic of the main jigger belongs to an 'black box' which cannot be decoded, and the condition that the jigger cannot be normally put into operation due to the failure of a control system happens many times. In addition, the main jigger is driven by a motor, and when the axle locking condition occurs to the individual bearing bushes in the shafting of the steam turbine generator, the main jigger can jiggle and not move the rotor of the steam turbine because of small output moment. When the rotor of the steam turbine is in a hot state, if the rotor cannot be cooled by continuous disk rotation, the rotor can be bent and deformed, and serious damage to equipment can be caused. Serious accidents of permanent deformation of a steam turbine rotor caused by multiple-cause jigger faults at home and abroad occur, so that huge economic loss of a power plant is caused. In order to ensure the safety of starting and stopping of the unit, a series of emergency measures are adopted by a power plant, but based on the limitation of field process conditions, the emergency jigger is longer in implementation time and cannot meet the requirement of quick response. At present, a power plant adopts a mode of dragging a steel wire rope by a crane to reel a rotor, and the concrete steps comprise removing the cover shells and the supporting devices of the LP1-LP2 couplers, removing the wind-proof shields of the couplers, symmetrically removing two coupler connecting bolts by using a special stretching tool, installing a reel pin, connecting a hanging strip, a crane hook and reels the rotor. However, the above steps are time-consuming and labor-consuming to perform, and the jigger preparation process is time-consuming. In particular to a rotor with larger size, the rotor has larger elastic deformation after standing, and each time shafting adjustment is carried out, manual continuous turning is needed for 2 hours to eliminate the rotor deformation. According to industry experience, the rotor is kept stand for 30 minutes in a high-temperature environment, and permanent deformation can occur. Therefore, the conventional method can cause deformation of the rotor to affect the service life of the rotor. It can be seen that how the turning function of the rotor is achieved in a short time, especially within 30 minutes, is of particular importance. In addition, the existing mode that the crane drags the steel wire rope to reel the rotor is used, so that the problem that the steel wire rope is heavy in load and easy to deform and slip due to the fact that the rotor is heavy is solved, and the damage to operators and the serious damage to equipment are caused. And the manual jigger tool is about 3 meters long, so that a plurality of people are required to operate the rotor simultaneously, and the field civilized overhaul specification is not facilitated. Disclosure of Invention The invention aims to overcome the defects in the prior art, and provides the emergency jigger device for the steam turbine generator, which can complete the installation within half an hour, realize the function of jigging a rotor, has high maintenance efficiency and good safety, and can complete the operation by a single person. In order to achieve the above object, the present invention provides the following technical solutions: The utility model provides a turbo generator emergency jigger device, its characterized in that includes motor, reduction gear and the transmission case that connects gradually along power transmission direction, the bottom of transmission case is equipped with the pawl, the pawl can for the transmission case horizontal slip is used for driving turbo generator's ratchet intermittent type nature to rotate. As an implementation mode, an upper sliding block, a gear set and a lower sliding block which are sequentially connected from top to bottom are arranged in a shell of the transmission case, a rack is arranged below the upper sliding block, a rack is arranged above the lower sliding block, and the pa