Gate hoist, also known as hoist gate, is a large-scale hydraulic machinery products gate hoist to the normal operation of hydraulic structures, in addition to meeting the design requirements of general lifting machinery, safe, reliable and flexible operation has special significance. Screw hoist can be divided into: flashlight dual-purpose screw hoist hand-pushed screw hoist, side swing hoist, manual screw hoist and other threaded rods directly or through the guide slider, connecting rod and gate blade connected, screw up and down to open and close the gate machinery. The screw is supported in the load-bearing nut, and the nut and the driving mechanism (bevel gear or worm gear drive) are fixed on the support frame. Turn on the power supply or drag the transmission mechanism with the manual handle to drive the load-bearing nut to rotate, so that the screw lifts to open and close the gate. The screw is subjected to compression and tension. It is necessary to calculate the stability of the pressure bar when the pressure is forced to fall down. Screw hoist is simple in structure, strong and durable, low in cost, suitable for small plane gate and arc gate, its opening and closing force is generally below 200 kN. 500 kN, 750 kN large capacity screw hoist has also been produced for diving hole plane gate and arc gate operation. For the fixed hoist, its installation is mainly based on the lifting center of the gate, the longitudinal and transverse deviation distance should not be less than 3 mm, the horizontal deviation should be less than 0.5 parts per thousand, and the height deviation can reach 5 mm. In the process of connecting screw and gate, the vertical deviation of screw hoist will not be greater than 0.5 parts per thousand; we also need to conduct a comprehensive inspection and inspection when the hoist is installed. To open gear and shaft lining for a comprehensive rotation, and in the rotation of the place for oil and iron cleaning work, mainly to remove dust, plus new oil, and according to the reducer instructions for installation, but also in accordance with the product instructions for refueling and the required level of oil treatment. When we locate the hoist, the foot bolt treatment at the bottom of the frame should be poured into concrete, and the machine base and concrete must be filled with cement mortar. Our gantry crane installation process, a comprehensive inventory and check, but also the components of the machine for installation, in the installation process, deviation must comply with the relevant provisions of the drawings, if there is no accurate provisions, you can refer to the corresponding requirements for execution; for gantry crane track installation, the door group If there is any deviation, the installation should be carried out according to the contents stipulated in the drawings and manufacturer's instructions.