Replacement method for wind field gear box of three-point supporting structure wind power generation unit

Abstract

The invention discloses a replacement method for a wind field gear box of a three-point supporting structure wind power generation unit. The replacement method is characterized in that a main shaft fixing tool is provided. The replacement method concretely comprises the following steps that an upper top cover of an outer cover of an engine compartment is dismounted; the main shaft fixing tool is hoisted to the engine compartment and is fixed to a main frame in the engine compartment; a middle gear box fixing seat is loosened; the wind field gear box is downwards hoisted to a ground safety zonefor storage; a new gear box for replacing is hoisted into the engine compartment; front and rear connecting bolts of the new gear box are fastened and cables are connected; the main shaft fixing toolis dismounted and hoisted downwards; the upper top cover of the outer cover of the engine compartment is hoisted and mounted; and unit testing and operation are carried out. By employing an auxiliarydevice, namely, the main shaft fixing tool, a main shaft assembly is turned from single-point supporting to double-point supporting, and during dismounting, a worker simply hoists down the wind fieldgear box from a crane tower without hoisting down a wind wheel or the main shaft assembly from the crane tower and simply requires a relatively low tonnage crane and a very small operation space, sothat the replacement method is safe and reliable, the quality is ensured, the replacement time is shortened and the cost is reduced.

Description

technical field [0001] The invention relates to a gearbox replacement method, which belongs to the technical field of wind power generation. Background technique [0002] During the operation of the wind turbine in the wind field, if the core component of the gear box has a low-speed gear chipping phenomenon, due to design problems, the replacement cannot be completed on the tower, and the tower needs to be replaced as a whole. At present, in the design process of high-power wind turbines, most of them adopt a three-point support design (that is, the main shaft is supported by a bearing, and the gearbox is supported by two points), and the wind wheel at the front end of the main shaft is heavy. The gearbox is removed separately, and the single bearing of the main shaft is supported by a single point, which cannot bear the weight of the wind wheel, which may easily cause damage to the bearing. Therefore, when replacing the gearbox of a wind turbine with a three-point support...

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