机械专业翻译 关于液压起重机 软件翻译不要.

The second category of lifting devices are used for carrying out a variety of maintenance work on vehicles. Many current designs include two or four posts above the ground .In these posts, a variety of somewhat complex mechanisms including ,for example ,hydraulic cylinders and chains are provided .The mechanism is connected to a platform for lifting a vehicle. In use, a vehicle is positioned above the platform. The platform includes movable supports, which are located beneath the support points of the chassis of the vehicle etc, .Then ,the mechanisms in the posts can be used to lift the platform and vehicle up. This then lifts the vehicle, with the wheels hanging freely, so one can readily work on the brake system, etc .,However ,such a lifts device has a number of disadvantages .It does not enable alignment work to be carried out ,as the steering wheels are hanging freely. Also, whilst such a lifting mechanism provides free access underneath a vehicle, the provision of posts requires

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