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Improper installation and adjustment of the worm wheel in the steam turbine reducer will cause malfunction in all aspects. If the main oil pump is damaged and cannot be supplied with oil, the governor will be shaken, the tachometer indication will be inaccurate, etc., and eventually the unit will be unable to operate. The malfunction of the worm wheel set is manifested in improper connection of the teeth or poor contact. The incorrect connection of the teeth is mostly due to the large difference between the actual center distance of the worm wheel set and the design number. However, the actual center size gap is too large or the center line is not perpendicular to the manufacturer, and there are also improper installation and adjustment of the site.
When the steam turbine is running, the center line of the worm should be located in the central plane of the worm gear teeth. When the turbine is stopped, the coloring check worm wheel can be correctly placed at this position.
In the coloring inspection, the working face of the worm gear should have more than 57 contact areas and be uniform. If the contact area is insufficient or the one side is colored, it means that the position of the worm wheel is to be adjusted. A good check of the coloring check worm wheel set does not fully explain the suit of the worm wheel. Because when the turbine is running, some movement of its shaft will occur, and the positional relationship between the worm and the worm wheel will change.
In order to mount the worm gear on the horizontal axis as much as possible in the correct position during operation, the following important conditions must be met: when the turbine rotor rotates clockwise (as viewed in the direction of the steam flow), the working surface of the worm wheel teeth There are colors from 1/2 to 3/4 on the right side. To do this, the worm wheel must be moved slightly to the left (change the thickness of the adjustable gasket).
The products related to aerial work platforms mainly include: scissors type aerial work platforms, trailer type aerial work platforms, curved arm aerial work platforms, straight arm aerial work platforms, aluminum alloy aerial work platforms, sleeve type aerial work platforms and spider type aerial work platforms.
Analysis of contact area of ​​worm tooth in steam turbine