Electric Hoist

Various types of hooks and cast parts are used to manufacture different hoist models.
The main structural components of a hoist are cast steel and iron parts, sprocket wheels that form speed reducer mechanisms and calibrated load chains.
A technician assembles the parts needed to manufacture electric chain hoists.
The first step is to install a hook onto the cast steel part that will hold the combined weight of the hoist and the load, and to weld the bolt on the screw thread. All notches on the cast steel are eliminated to avoid eventual problems from arising when assembling the part with the other components. Using a grinding wheel, the technician also corrects the sharp edges of the cast iron part, which will be used as the motor gear casing. All grease and dust on the surface of both parts are removed using a solvent. The technician then injects industrial-strength adhesive in the oil seals, and inserts an oil ring seal and a ball bearing. The gear parts are placed on a heater so that they expand and provide a tighter adjustment, and the technician then assembles the chain axle shaft that will allow for the winding and unwinding of the load chain. The cast steel part is slid on the shaft first, followed with a spacer, the sprocket wheel, a second spacer, and a ball bearing. This assembly is then topped with a sleeve and tightly compressed on the shaft.
The technician applies a coat of grease before installing the packing; he then unites the cast iron with the cast steel. He inserts the secondary worm screw shaft that will fit into the largest sprocket wheel on the shaft, adjusts this screw shaft and puts a closure plug on top that he hammers to make sure it is secure. The technician then slides an oil ring seal on the shaft thread and hammers it all around the shaft to seal the cast iron part. Afterwards, he fills it completely with extreme-pressure gear oil so that all inside parts are covered with oil, which will limit friction between gear wheels. The assembled gear is then installed on a test bench to check that all connections are tight in the casing. Now equipped with a drive hub with a safety brake, the casing can be connected to the motor. The technician places the rotor upon the main worm screw shaft and slides the stator over the rotor, aligns it with the screw holes on the casing, and pushes it firmly into place. Strain reliefs are installed on the cables, and the technician screws on thread bars for the electromagnetic breaking system. He slides the disc brake on the drive hub and screws a plate that holds the electrical components. The connectors are secured on and the wires are connected to the contactors that send the current to the electrical engine.
The push-button control cable goes through a strain relief and is connected to the electrical panel. Equipped with all these electrical components, the hoist is ready for testing. A worker tests all control systems, including the buttons, to hoist and put down the load. He also checks the electromagnetic safety braking system activated when the motor turns off, as well as the automatic shutdown switch that stops the hoist before its chain reaches the end of its travel length. The hoist is then painted. The work starts by spraying a base coat on the whole surface, then the yellow paint typical of the brand is applied. Finally, a worker covers the electrical panel with a protective cap, ensuring that the cap is aligned with the screw holes so that he can fish it with cap nuts. The load rating is written on the hoist. Whether it is intended for a warehouse, a factory or another facility, this hoist will be very useful for lifting heavy loads.