Electric hoist gantry crane structure analysis

  Electric  hoist gantry crane  is a simple crane, single girder and double girder two kinds. Due to simple structure, easy to manufacture, light weight, low cost, easy installation and maintenance, etc. has been greatly developed, widely used in industrial and mining enterprises, railways, docks, warehouses, material and other places. However, due to electric hoist gantry crane structure is simple in design, production, installation, inspection process, failed to pay sufficient attention. Electric hoist  overhead gantry crane  in use process, due to defects in leg connection, cracking and other hazards arising from capsizing accidents have occurred. Therefore, in the test session, focusing on electric hoist gantry crane outrigger installation quality inspection is to ensure the safe production, accident prevention is an important safeguard.
    Span girder design position with legs attached on both sides neither rectangular steel beam flange bolting, nor rectangular steel flanges welded way, but the position of the main beam span both sides of the legs connected The upper beam of a beam made out in the form of the flange can not be connected with the leg in the field can only be used when connecting pad steel beams welded connections on the way, the manufacturing process may be due to the level of a problem, or factory on-site installation, the installation site 4 legs than the plate thickness of the pad gap, the beams and legs can not guarantee the effective contact area of ​​the flange, does not meet the requirements of GB3811, easy to instability. Electric hoist  gantry crane  operation easily reversed, deformation, resulting in shaking legs do not meet the requirements of the welding phenomena equally easy to produce due to uneven force fracture, shaking the crane operation, torsional vibration caused by tearing overturning the case.
        Electric hoist gantry crane track gauge deviation carts, cart tracks throughout the elevation difference and the same section do not meet the level of poor standard. Especially the two rail joint gap is too large, the maximum clearance is 25mm, carts passing a greater shock.
       Under the crane beams carts drive motor (conical brake motors) brake adjustment is not synchronized. Since the left side of the drive motor brake adjustment carts too loose, right carts drive motor brake adjustment too tight, resulting in carts running on the left than on the right carts carts run faster running speed, causing the system to run or moving back and forth when reversing operation. Carts orbit model and electric hoist gantry crane random file does not match the design model.