Non spark chain block explosion proof chain hoist a kind of aluminum bronze, beryllium bronze as blank manual lifting machinery, its the shell adopts H62 brass alloy material, the rotary gear after high temperature heat treatment, so as to achieve a very high wear resistance of the gear according to, durable, is a trust of hoisting machinery. This product in strict accordance with the national 3 suite execution, the product quality is the people's insurance company of China (PICC) accept insurance, please feel free to use.Detailed introduction: explosion-proof hand hoist is a kind of easy to use, easy to carry manual lifting machinery, explosion-proof hand in hand with the explosionproof manual monorail car of supporting the use of the manual lifting transportation vehicles, explosionproof hand gourd can be widely used in petroleum, petrochemical, oil, oil, gas, chemical industry, military industry, electric power, mining, electronic, railway, etc HuoHuan potential and the explosion of dangerous environment, in the operations friction between product impact won't produce mechanical sparks, effectively prevent fire accident, ensure state property and security of person. Also machinery manufacturing and mechanical maintenance indispensable special tools.Working principle: by YeDong bracelet, hand chain chain begins to turn of ratchet wheel, brake friction a (is compressed into one) common rotation, five long axis of rotation teeth and gear, four teeth spline gears