Today's hoist is known as a lifting device with very wide application in industry, construction, ... and brings high working efficiency. Therefore, the hoist is one of the indispensable structural equipment of the crane. People classify hoists into 2 main types: chain hoists and electric chain hoists.
- Definition: A chain hoist is an independently operating lifting device, operating by using human power as the driving force. A chain hoist is used to lift objects horizontally or vertically and can be temporarily anchored when stretched.
- Characteristics:
+ The weight of the hoist is light, and the structure is compact.
+ Lifting speed of the hoist is not high.
+ Lifting capacity: 0.5 to 5 tons
+ Lifting height: 3 meters
- Application of Chain Hoist
+ Chain hoist can only be used in small works with a little and irregular workload, used to lift and assemble structures.
+ Move the pile-driving machine, bored pile drilling machine; Support for the repair of machinery and equipment.
- Structure of chain hoist: (1) - load chain, (2) - automatic brake with non-separable friction surface, (3) - traction sprocket, (4) - worm gear, (5) - hoist hook, (6) - drive sprocket, (7) - screw, (8) - endless chain, (9) - object hanger.
Chain hoist
- Working principle:
+ When the endless chain (8) is pulled up, it will rotate the drive sprocket (6) and the screw shaft (7), through the screw transmission - the worm gear (7-4) the pull chain (3) rotates according to the. If the traction sprocket (3) is driven to turn in a counterclockwise direction, the object to be lifted is pulled up; and in the opposite direction, the object is lowered.
+ Screw transmission - worm gear (7-4) has the ability to self-brake to hold the object at a certain height, the chain hoist is usually designed with an automatic brake unit with an inseparable friction surface (2).
- Electric Hoist has electromechanical operating parts, with a gearbox and winch arranged in line with each other. Electric Hoist is used to lift heavy objects by overhead suspensions, the machine is capable of moving a rail or on the lower wing of steel beams arranged overhead.
Structure of electric chain hoist
Electric Hoist
Each electric chain hoist will be composed of the following extremely important parts:
(1) Hanger: used to hang the object, pull the object up and lower it safely.
(2) Load chain: is the bridge between the object and the hoist, the length can be customized by the principle of winding / releasing the chain.
(3) Hoist shell: is the part that wraps and protects the internal parts from harmful effects from the environment such as dirt, and oxidation to help increase the life and durability of the equipment.
(4) Electric hoist controller includes electric chain hoist brake load; control hoists heavy load; box Reduce speed; the travel stop switch is connected directly to the control circuit; push-button box; load motor.
(5) Overload protection: helps the motor of the machine to lift the load when operating beyond the load.
(6) Chain sprocket is the part that rolls and releases the chain during operation. We can easily fix the object at the desired height thanks to the sprocket.
- Working principle:
+ The electric cable hoist is hung overhead to perform the task of lifting objects and is designed with a moving mechanism on a rail or the lower wing of the overhead I-beam.
+ This device can be used independently to pull objects or used in the lifting mechanism of cranes and cranes.
+ This type of hoist uses cables and hooks based on electric motors to be able to lift and pull objects.
+ When hanging an object on high, because it is suspended, the object may be shaken or rotated, so usually, the electric cable hoist will design 2 windings symmetrically through the middle plane of the drum.
+ The reducer and the electric hoist controller release the cable through the pulley system and the crane hook. These two parts are connected to the control arm that has integrated buttons to control objects up and down, left and right easily. The user will control the device simply by using the corresponding control buttons.
Above is some information about Pa Lang, hope you have a better understanding of this type of equipment.
Please contact us for more details:
Quang Trung INDUSTRIAL GROUP JOINT STOCK COMPANY
Representative office address at: Lot 33 Villa 4 Linh Dam Peninsula Hoang Mai, Hanoi
Phone: 0379645086
Email: tapdoanquangtrunggroup@gmail.com
