Why Can Chain Hoists Easily Lift Several Tons Of Heavy Objects?

Why can Chain Hoists Easily Lift Several tons of Heavy Objects?

 

Chain hoist is a kind of manual lifting machine that is easy to use and easy to carry. It is also called inverted chain, chain hoist and other names. It is suitable for short-distance hoisting of small equipment and items. 6 meters, but also very labor-saving, cheap, widely used in factories, miners, construction and other fields as installation machinery, hoisting equipment, especially in places where there is no power supply and the space is narrow, it has obvious advantages.

 

 

Classification of chain hoists

 

Chain hoists are subdivided into many types, common materials are divided into alloy steel, stainless steel, explosion-proof, aluminum alloy chain hoists.

 

According to the shape, it is divided into round, triangular, square and mini chain hoists.

 

Chain hoist structure
 

Although the chain hoist looks small in size, it is composed of more than 70 parts, mainly composed of several large parts such as sprocket, hand chain, transmission gear, lifting chain and upper and lower hooks. The transmission mode is generally gear Type transmission, which is also the most widely used transmission mode at present, is driven by the lifting sprocket, the lifting chain is connected with the lower hook, the hand chain is used to transmit the human power, and the lower hook is used to hang goods.

 

 

Working principle of chain hoist

 

The 2 ton chain hoist is an upgraded version of the pulley, which completely inherits the advantages of the pulley. The labor saving of the chain hoist is to use the principle of mechanics to drive the hand chain by manpower to generate traction. Using the gear transmission method, the small gear drives the large gear, and the amplified torque Pass it out so as to drive the lifting chain to complete the lifting of heavy objects.

 

When the hand chain hoist lifts the goods upwards, pull the bracelet down to make the bracelet wheel rotate clockwise, and the bracelet wheel rotates to press the friction disc ratchet and the brake into one body to rotate together, so the bracelet wheel drives the transmission gears to drive the lifting sprocket. The chain is driven to lift the goods smoothly, and the ratchet friction plate one-way brake is used to automatically brake under load. The pawl is engaged with the gear under the action of the spring to ensure that the goods stay in the air at any position and will not fall by themselves.

 

When descending, pull down the other hand chain to make the hand chain wheel rotate counterclockwise. At this time, the pawl releases the ratchet, and under the action of the lower hook and other self-weight, it can descend smoothly. When the hand chain stops pulling, the brake immediately Restoring the braking function, so that the cargo can be stopped at any position.

 

Capacity(T)		1	1.5	2	3	5	10
Lifting height(m)		2.5	2.5	2.5	3	3	3
Load chain	No.ofs	1	1	1	1	2	4
	Demension	6×18	7.1×21	8×24	10×30	9×27	10×30
Force of full load		250	265	335	372	360	380
G.W. / N.W.(kg)		14.5/15	16.5/17	19.5/20.1	32/34	41.1/43.6	75.7/79.1
Demension(mm)	A	149	176	176	231	249	463
	B	153	173	173	185	185	185
	C	29	35	35	39	49	54
	D	41	51	51	49	67	75
	Hmin	352	385	385	445	615	765
Additional weight per 1m lift(kg)		0.8	1.1	1.4	2.2	3.8	8.8

 

Manufacture of chain hoists

 

The main parts of the 2 ton chain hoist are made of alloy steel. The lifting chain is one of the most important and key parts of the chain hoist. The material is made of alloy steel. According to the different tonnage, the specifications of the chain are also different. The diameter of the chain for 1 ton is 6 mm, the diameter of a 3 ton chain is 8 mm, learn how the chain is made.

The steel bar is first straightened by the machine, and then a gap is pressed on each section of the steel bar according to the size, which is convenient for cutting the steel bar when pressing and buckling later.
 

The machine then presses each steel bar into an oval-shaped buckle, and connects each buckle to form a long chain.

 

The round buckle on the chain needs to be welded, and then undergoes high-temperature heat treatment to ensure the strength, and the surface of the chain is electroplated to meet the anti-corrosion requirements.

 

 

Safety and maintenance of chain hoists

 

As a kind of lifting equipment, the 2 ton chain hoist needs to carry several tons or tens of tons of gravity during use. If it is not operated properly or the product quality is not up to standard, it will cause a safety accident.

 

When purchasing, select the corresponding specifications according to the needs of use. The specifications can only be large or small, and the load capacity of the product cannot be exceeded during use. Check the appearance of the product and the welding quality of the chain.

 

Before use, check whether the components are complete and firm, and whether the hand zipper has slipped chains or dropped chains.

 

Do not pull the chain obliquely when in use, do not pull heavy objects obliquely or laterally, and do not use force other than manpower for strong pulling. When lifting or lowering, it is strictly forbidden for people to stand or walk under heavy objects. When using chain hoists Pull the bracelet back first, let the lifting chain relax, so that it has a sufficient lifting distance, and then slowly lift,

 

After use, it should be maintained regularly, and the transmission parts should be lubricated to reduce friction.