The Development Course of Chain Block

　　The Development Course of Chain Block

　　The chain blocks have a good market share both at home and abroad. In fact, they do not look what we see them today but evolving into what they are now-the embodiment of beauty and utility.

　　At early times, the lifting equipment was so called differential pulley of which the structure was the simplest one and the cost was lowest with a rated efficiency of 30% or so. A cycle chain connects the upper pulley with double slots and a lower pulley with a single slot, which is used to lift or lower load.

　　With the development of science and technology, spiral gear chain block replace the original chain block. It had a higher cost than the previous one but the rated efficiency was up to 40%. Running smoother than the differential pulley, it had a slower speed.

　　And then, many manufacturers began to produce spur gear chain block with an even higher efficiency and is more economical from a long term of view. It is a combination of high-speed chain block and a Weston self-operated valve with a rated mechanical efficiency of about 80%. There are many forms of spur gears of which light alloy and rolling bearings which are used mostly are two of the standard models.

　　Finally, here comes the hand chain block with beautiful appearance, high efficiency and need light hand pull force. Hope you get informed about the development course of chain block through the above instructions.