Maintenance and maintenance of gate hoist

　　Screw hoistAlso known as screw hoist, it is a machine that uses a threaded rod to connect with the gate leaf directly or through a guide slider and a connecting rod, and the screw moves up and down to open and close the gate. With the widespread development of water conservancy and hydropower projects, hoists and gates used in river dams and hydropower stations in reservoir irrigation areas have been widely used. The knowledge of its installation and debugging technology and maintenance should also be promoted. For construction and installation units and use management departments, this technology and knowledge should be popularized in order to ensure the quality of the project and bring out the project benefits.

Precautions for installation of hoist:

1. The foundation of the base should be firm and level during installation, leaving a place for the foot screws. After the hoist is in place, level it and pour it into shape.

2. First wind the wire rope on the balance wheel. The length of the rope is divided equally on both sides, and the wire rope is wound up through the movable pulley group, and the two ends are fixed at the end of the reel. The structure of the screw hoist is very simple, and the installation is relatively simple. It is widely used in the opening and closing of the culvert gate of the channel and the gate of the water diversion hub. However, in the process of use, there will often be top gate accidents. The cause of this accident What is it like?

Reasons for the top gate accident:

1. The operator of the top gate accident caused by human factors is sloppy, does not follow the gate opening and closing procedures first to check, and then the operation or the original operator asks for leave due to accidents, and the substitute personnel operate blindly when they are not familiar with the opening and closing procedures and methods. If the direction of opening and closing is reversed, the gate is opened when the gate is closed, the wrong button is pressed during electric opening and closing, or the direction is reversed during manual opening and closing, and the closing direction is mistakenly operated as opening; some are in closing The operator's thoughts are not concentrated, and the brake fails to stop immediately when the brake reaches the lower limit position. Some of the limit nuts and limit signs of the screw are shifted, which can not be used as a limit. Electric gate hoists will also encounter changes in the phase sequence of the power supply when the power supply department repairs electrical equipment or power supply lines, causing the motor on the gate hoist to change the original direction of rotation, resulting in a change in the direction of the gate hoist. At this time, if the gate is in When the gate is opened in the closed state, a top gate accident is bound to occur.

2. The top gate accident caused by non-human factors. During the operation of the gate, floating objects such as trees or stones and other obstacles are brought to the bottom of the gate by the high-speed water flow or rushed into the gate trough. If the gate is closed at this time, it will become the gate The lower edge has been blocked by obstacles to produce a reaction force before it touches the bottom of the gate, but the limit mark or limit switch on the screw is not in place, and it does not have the function of limit stop or remind the operator to stop, so the operator does not It will stop, and the gate hoist will drive the gate to continue to press down. When the reaction force exceeds the endurance of the gate hoist or hoist, a top gate accident will inevitably occur. In the course of use, pay particular attention to the top gate accident of the screw hoist. If such an accident occurs, it must be dealt with in time to avoid more serious accidents.