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How to repair single girder bridge crane parts

by:Powerston     2021-04-25
There are too many repairs on single-girder construction hoist components, and this article cannot be covered one by one. It will be explained in several articles. This article mainly talks about the maintenance of these four parts: hook, wire rope, pulley block, and drum. There are too many repairs on single-girder bridge crane components, and this article cannot be covered one by one. It will be explained in several articles. This article mainly talks about the maintenance of these four parts: hook, wire rope, pulley block, and drum. 1 Hook (1) Disassemble and check the hook, shaft, beam, pulley, bearing and clean and lubricate (2) Check the wear condition of the dangerous section (3) Test of the hook (4) Overhaul of the hook (1) Hook, beam, The pulley shaft is not allowed to have cracks, the threaded part should not be loose, the bearing is intact, and the pulley is rotated, if there is a knife mark or crack at the thread undercut, it should be replaced. (2) The dangerous section whose wear exceeds 10% of the original height should be replaced. (3) After major repairs, the hook should be tested and suspended for 10 minutes at 1.25 times the rated load. The elastic opening of the hook should not exceed 0.25% of the size of the hook, and there should be no deformation or cracks after unloading; (4) After the board hook is riveted, the gap between the board and the board should not be greater than 0.3mm 2 Wire rope (1) Broken wire inspection (2) Radial wear (3) Deformation inspection (4) Wire rope lubrication (1) Break within 1 lay length If the number of wires exceeds 10% of the total number of wires, it should be scrapped according to the standard. (2) If the radial wear of the wire exceeds 40% of the original diameter, the whole wire rope should be scrapped. (3) The diameter of the wire rope should be reduced to 70% of the rope diameter. Those who have broken strands should scrap the steel wire rope and replace it with a new one. (4) Before lubricating, clean it with a steel wire brush, kerosene, etc., and dip it into saturation with steel wire rope hemp grease (Q/SY1152-65) or synthetic graphite calcium-based lubricating finger (SYA1405-65) Appropriate 3 pulley block (1) disassemble, wash and repair the pulley block, check for cracks (2) check and repair the pulley groove (3) check the shaft hole (4) assembly (1) the pulley shaft must not have cracks, and the shaft journal must not wear 30% of the original diameter. If the temperature is not more than 5%, it should be replaced if it exceeds this value. (2) Check the groove shape of the pulley with a sample plate. The radial wear should not exceed 30% of the wall thickness, otherwise it should be scrapped. Those who cannot exceed the standard can be repaired. After major repairs, check with a sample plate. The bottom and lateral gaps should not be greater than 0.5mm. The deviation between the centerline of the wheel groove and the centerline of the pulley should not be greater than 0.2mm. The deviation should not be greater than 1mm (3) After overhaul, the shaft hole is allowed to have defects not exceeding 0.25CM2, and the depth should not exceed 4mm. (4) After assembly, it should be able to rotate flexibly by hand, and the lateral swing should not exceed D/1000. D- the nominal diameter of the pulley 4 reel (1) reel rope groove (2) reel surface (3) reel shaft (4) assembly and installation (1) rope groove wear more than 2mm should be re-machined, rope after overhaul The groove should meet the requirements of the drawing, but the wall thickness of the reel should not be less than 81% of the original thickness (2) The surface of the reel should not be cracked, there should be no obvious out-of-roundness, and the pressure plate screw should not be loose (3) The reel shaft There should be no cracks on the surface. After major repairs, it should meet the requirements of the drawings. When the wear exceeds 5% of the nominal diameter, new parts should be replaced. (4) The center line of the reel shaft should be parallel to the support surface of the trolley frame, and the deviation should not be greater than 1mm/ m. After the reel is installed, the deviation of the center line of the two shaft ends should be no more than 0.15mm. Repairing the parts of the single beam bridge crane is a troublesome task. As long as there is a problem that cannot be used, it must be checked and repaired. If the repair is not good, contact us directly The manufacturer will solve it.
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