Pay attention to whether the screw rod of gate hoist can stop moving in the required direction, whether the motor and gearbox can run well, and whether the gearbox and the screw wheel can move synchronously. Observe whether the motor speed, temperature rise can be normal, whether the vibration can be too large, whether the sound can be abnormal. If abnormal conditions are found, the machine should be stopped immediately for reflection, to prevent equipment deformation or damage, and report to the dispatcher and the project in charge. After the shutdown, the number of switch wires should be checked again. The gate is used to block and open the control equipment of the discharge (discharge) channel. An important part of hydraulic structures can be used to block water flow, control water level, regulate flow, discharge sediment and floats, etc. (1) According to manufacturing materials. There are mainly wooden gates, steel frame gates with wood panels, cast iron gates, reinforced concrete gates and steel gates. (2) According to the relative position of gate top and horizontal plane. There are mainly open-top gate and submerged gate. (3) According to the nature of obligations. There are mainly obligatory gates, accident gates and overhaul gates. (4) According to the method of gate opening and closing. Mainly use mechanical operation to open and close the gate and use the change of water pressure when the water level rises and falls to control the opening and closing of the hydraulic automatic gate. (5) According to different supporting modes of door blades. Mainly by fixed wheel support gate, hinge support gate, slideway support gate, sprocket gate, series roller gate, round roller gate and so on.