Single beam crane parts inspection precautions

[BONOVO]

一 rope

(1) The number of broken wires within the secondary torsion distance shall not exceed 10%, and the wear and corrosion of the steel wire surface shall not exceed 40% of the original diameter (lifting hot metal or dangerous crystal wire rope, the broken wire standard is 1/2 of the ordinary crane). The intelligent crane is a multi-action lifting machine that lifts vertically and carries heavy objects horizontally within a certain range. [1] The work is characterized by intermittent movement, that is, the corresponding mechanism of taking material, migration, unloading and other actions in the more work cycle is alternately working, and the development and use of cranes in the market is more and more extensive. For the boom type crane, its rated lifting weight changes with the amplitude, and its lifting characteristics are characterized by lifting torque. The value indicated on the sign is the larger lifting weight. The horizontal distance, in m, between the rotating center line of the gantry crane and the plumb line of the fetching device. The amplitude of the non-rotating type boom crane refers to the horizontal distance between the center line of the spinner and the rear shaft of the boom or other typical axes.

(2) The wire rope should have no kinks, dead angles, hard bending, plastic deformation, hemp core out and other serious deformation, good lubrication condition.

(3) The length of the wire rope we may be able to ensure that when the safety hook is lowered to a low position (including the pit), the wire rope remaining on the larger drum is not less than 3 rings.

(4) Wire rope end fixed pressure plate 2 pieces.

二, pulley

(1) Pulley rotation is flexible, smooth without cracks, flange part without defects, no damage to the wire rope defects.

(2) When the uneven wear of the wheel groove reaches 3 mm, or the wall thickness wear reaches 20% of the original wall thickness, or the bottom diameter of the wheel groove reduces 50% of the diameter of the wire rope, the pulley should be scrapped.

(3) The pulley guard should be installed more firmly, without damage or significantly different deformation.

三, the hook

(1) The surface should be smooth, without cracks, acute angles and other defects. Defects on the hook are not allowed to be repaired.

(2) The hook should be rotated flexibly, and the positioning bolt and cotter pin should be fixed intact.

(3) Cracks are strictly prohibited in the dangerous section of the lower part of the hook and the retracting slot section of the hook tail thread.

(4) The amount of wear on the dangerous section can not be used more than 10% of the original size. The increase in the wear of the hook bushing should not affect more than 50% of the original size, and the wear of the mandrel should not exist more than 5% of the original size. This article mainly comes from dream weaving

Four, single beam crane brake

(1) The action is flexible and reliable, the adjustment should be moderately tight, no cracks, no plastic deformation of the spring, and no end edge.

(2) When releasing the brake wheel, the gap between the brake shoe and the brake wheel should be basically equal. The brake opening (unilateral) should be 1 mm, and the elevator should be 0.7mm.

(3) The friction surface of the braking system of the brake wheel shall not have defects that hinder the braking technical performance, and shall not be stained with oil or paint.

(4) The surface roughness of the wheel should be 1.5mm. The wear of the brake wheel thickness of the lifting mechanism should be less than 40% of the original thickness, and the wear of the brake wheel thickness of other mechanisms should be less than 50% of the original thickness.

(5) If the lifting machinery of the crane is loaded with hot metal, flammable and explosive dangerous goods or may cause major danger or loss after sliding the hook, two sets of brakes shall be installed.

5. Limit position and interlocking device

(1) The over-winding limiter should ensure that when the safety hook rises to a relatively limited working position (electric hoist > 0.3m, double beam crane > 0.5m), the system power can be automatically cut off. The newly installed crane design should also have lower limit stopper.

The operating mechanism shall be equipped with a travel limiter and a mutual inductance limiter to ensure that the travel distance between the two cranes is 0.5m. When the crane is 0.5~3m away from the limit end (depending on the tonnage), the power supply is automatically cut off.

(3) When the lift cage (car) of the lift (or lift) crosses the upper and lower terminus 30-100mm, the interchange switch should cut off the control circuit, when the horizontal position of the upper and lower terminus is 130-250mm, the interchange switch should cut off the control circuit, the limit switch should cut off the main power supply, and cannot be automatically reset.

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