News
MGHZ crane inspection standards
2014-12-22 13:36
MGHZ crane inspection standards
Zhengzhouhuazhong Construction Machinery Factory of each crane will by the National Bureau of Special Equipment Safety Supervision Inspection. National quality inspection for special equipment safety inspection standards have developed, we should strictly follow the crane inspection standards for quality testing.
Daily inspection crane, some electric hoist and crane girder connection exists leg irregularities. Under normal circumstances, the legs are made from sheet steel into a trapezoidal shape or a right angle isosceles trapezoidal cross-section box shaped column, the width of the upper flange, a lower flange narrow, increasing the strength of the door frame, stiffness and stability. When the span is greater than 30m, in order to improve operating results carts designed a pair of flexible legs.
Under normal circumstances a large crane wheel rim and the cart track backlash should be within 20 ~ 30mm, to ensure that the big wheel in the rotation between the inner rim of the side rail carts have some travel clearance. Generally the inside of the wheel rim and the large crane accident carts track backlash value does not meet the standard, so that the legs and carts running on beam connections have a great additional moment.
Crane girder beams and symmetrically arranged on both sides of the main beam by two bolts fastening the flange, and the narrow width on two legs, the formation of "A" shaped structure, improve the stability of the crane. Normal operating conditions is not easy leaving defect crane overturning phenomenon.
When the crane outrigger installation supervisory inspection inspectors should be present, because electric hoist crane girder and legs produce small deformation during transport, will make the beam flange connected with the legs produce changes in the natural state, 4 not on the same plane on a beam flange face and legs flange to prevent the use of forced construction unit assembled during installation.
Zhengzhouhuazhong Construction Machinery Factory of each crane will by the National Bureau of Special Equipment Safety Supervision Inspection. National quality inspection for special equipment safety inspection standards have developed, we should strictly follow the crane inspection standards for quality testing.
Daily inspection crane, some electric hoist and crane girder connection exists leg irregularities. Under normal circumstances, the legs are made from sheet steel into a trapezoidal shape or a right angle isosceles trapezoidal cross-section box shaped column, the width of the upper flange, a lower flange narrow, increasing the strength of the door frame, stiffness and stability. When the span is greater than 30m, in order to improve operating results carts designed a pair of flexible legs.
Under normal circumstances a large crane wheel rim and the cart track backlash should be within 20 ~ 30mm, to ensure that the big wheel in the rotation between the inner rim of the side rail carts have some travel clearance. Generally the inside of the wheel rim and the large crane accident carts track backlash value does not meet the standard, so that the legs and carts running on beam connections have a great additional moment.
Crane girder beams and symmetrically arranged on both sides of the main beam by two bolts fastening the flange, and the narrow width on two legs, the formation of "A" shaped structure, improve the stability of the crane. Normal operating conditions is not easy leaving defect crane overturning phenomenon.
When the crane outrigger installation supervisory inspection inspectors should be present, because electric hoist crane girder and legs produce small deformation during transport, will make the beam flange connected with the legs produce changes in the natural state, 4 not on the same plane on a beam flange face and legs flange to prevent the use of forced construction unit assembled during installation.
