A method of replacing the parallel medium-speed gears of wind power gearboxes in the air

Abstract

The invention discloses a method for replacing a parallel intermediate-speed gear of a wind power gear box in the air. By means of multiple steps, an upper box body of the gear box is hoisted away from a parallel box body in a cabin, and an old parallel intermediate-speed shaft system is hoisted out of the gear box; and then a hoisting tool is built, the demounted old intermediate-speed shaft system is hoisted down from a draught fan, a new intermediate-speed shaft system is hoisted onto the draught fan and mounted in the gear box, finally, box combining is carried out, and the tool is demounted. According to the process scheme, the process can be completed by 6 persons within 7 working days as long as personnel are allowed to get on the draught fan; and the shutdown treatment time is short, cost is low, operation in the cabin can be achieved with the air speed being blow 15 m / s, and the total cost is only about 180,000.

Description

technical field [0001] The invention relates to the maintenance of a wind power generation gearbox, in particular to a method for replacing parallel medium-speed gears in the air of a wind power gearbox with a one-stage planetary two-stage parallel structure. Background technique [0002] The parallel medium-speed gears are installed between the upper and lower casings of the parallel stage through the bearings at both ends of the medium-speed shaft system. The medium-speed shaft gear meshes with the high-speed gear, and the medium-speed gear meshes with the low-speed gear. If the shaft gear or gear of the parallel medium-speed stage is damaged but cannot be taken out directly, it is basically necessary to hoist the gearbox as a whole from the fan and return it to the factory for replacement and repair; the first reason for this is the limited space in the engine room and the structure of the gearbox. It is difficult to open the gearbox. Second, the rated lifting weight (250...

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Problems solved by technology

[0002] The parallel medium-speed gears are installed between the upper and lower casings of the parallel stage through the bearings at both ends of the medium-speed shaft system. The medium-speed shaft gear meshes with the high-speed gear, and the medium-speed gear meshes with the low-speed gear. If the shaft gear or gear of the parallel medium-speed stage is damaged but cannot be taken out directly, it is basically necessary to hoist the gearbox as a whole from the fan and return it to the factory for replacement and repair; the first reason for this is the limited space in the engine room and the structure of the gearbox. It is difficult to open the gearbox. Second, the rated lifting weight (250kg) of the built-in crane in the nacelle cannot lift the parallel medium-speed shafting (800kg-900kg); The shaft gear or gear is damaged. The general method at home and abroad is to hang the wind turbine gearbox from the fan, transport it to the factory for repair, and then transport it back to the wind farm for installation after the repair is completed. The wind turbine gearbox has the following disadvantages : (1) The downtime is long, it takes two days for the gearbox to be hoisted up and down, at least two days for transportation, and at least one week for factory maintenance; (2) The cost is high, the power generation loss of the shutdown is not counted, and the hoisting cost will cost 200,000 yuan. Including transportation and maintenance costs, it will cost at least 500,000 yuan; (3) It is obviously affected by the weather, the wind speed exceeds 10m / s and cannot be hoisted, and it cannot be hoisted when it rains

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