The housing assembly is made of thick section steel plate to provide enough weight.The wire line is kept taut when hoisting or lowering the unloaded block.

• 侧板为厚纲板；有足够的强度和重量.；当提升和下放空吊卡时，钢丝绳常处于紧张状态，有利于滚筒缠绳和空钩下放速度，延长钢丝绳寿命。