How To Identify The Quality Of The Wire Rope?

- Nov 05, 2018-

1. Packaging.

The quality of the packaging wire rope is mainly reflected in the packaging. After the wire rope arrives, the rope wheel is deformed, broken or scattered, causing the wire rope to be wounded, crushed, scratched or protected from moisture on the rope wheel, causing serious corrosion and affecting the user. However, strictly speaking, it does not stop there. If the packaging does not meet the standards or the contract, the order contract and the actual delivery are not in the package inspection. The main reasons for the above quality are as follows: 1. When the manufacturer designs the sheave, the strength is not considered well. Second, the packaging is not packed according to the packaging standard and the contract standard. Third, the transportation department does not load and unload according to the operating procedures. Fourth, the use of the custodial department is not correct. Method storage, etc.

The quality of the wire rope packaging is as follows: In the loading and unloading, the rope wheel is broken, the packaged packaging cloth is torn, the hoisting rope buckle is squeezed in the gap of the rope, the loading and unloading is not possible, the wooden shaft is broken, the steel wire rope is broken, the steel wire rope is broken, the steel wire rope is broken. The strength of the damaged sheave caused by the scattered rope is not enough. After the break, the management of the disordered warehouse is disordered. The disorderly management of the warehouse is disordered. The piles of the lower ropes are crushed, the steel ropes are damaged, and the steel ropes are in the warehouse and the dock. It was burnt down.

2. surface damage

The surface damage of wire rope or steel wire is generally referred to as surface damage, such as bruising, bruising, hanging, scratching or nailing, but the plastic deformation caused by wire pressing die, pre-transformer or roll die in the manufacturing process does not belong to the category of surface damage.

Compression: After the rope strand is crushed, the wire rope is deformed, the rope strand is crushed, and the diameter of the rope is deformed, resulting in uneven twist distance, increased thigh clearance, increased thigh clearance, and exposed hemp core, which are generally caused by handling drop and external force impact.

Bruise: after a strug injury, the hard core is raised and the core is exposed. It is usually caused by transportation.

Trauma: After the rope strand is hung, the strand is not tightened unevenly; the rolled rope is seriously hung and discarded, usually caused by the production process.

Scraping: this kind of damage is a defect caused by transportation or loading and unloading, usually caused by transportation.

Nail injury: The nail on the head of the rope has caused internal damage. The phenomenon caused by the nail fixation is generally not a quality problem.

Scratches: the outer layer of steel wire is scratched by hard objects, resulting in loosening of the outer thread of the strands, which is usually caused by transportation.

3. Defects

The so-called tanning defects, in a broad sense, that is, all kinds of defects in the tanning system (referring to the shackles or ropes) that do not meet the quality requirements of the trombling quality requirements in the wire rope standard are collectively referred to as tanning. Defects, including: 松 松 elastic unevenness, strand loose rope shift, severe tightness of the strands, uneven bulging of the strands, uneven tension and bulging The bulging, multi-layer strands are not rotating, the outer strands of the steel wire rope are loosely bulged, the hemp core is displaced, the strands are broken, and the strands are loosened by the wire, causing a slack of the strands, a severe slack mess, and no hemp core in the length of the rope. Severe jumps, severe uneven distance and so on.

4. Surface rust (floating rust)

Oxidation of the surface of the wire rope (local or integral). Reasons for the surface rust (floating rust) of the new wire rope:

First, the production of acid, alkali, salt and other substances remain on the surface of the steel wire.

Second, the steel rope grease contains too much acid, alkali or water.

Third, the oil is poorly coated in the production of steel wire ropes.

Fourth, improper packaging moisture protection measures (by its imported wire ropes to be transported by voyage) caused by harmful gas impregnation.

It is permissible to have a slight rust on the new rope (especially the wire rope that the user requires not to be oiled), but there are still rust spots after rubbing or those who have caused pits and pockmarks should be held responsible for the manufacturer.

5. Zinc plating defects

Galvanized steel wire rope galvanized steel wire surface cracking, shedding, zinc accumulation, zinc bismuth and exposed steel are all galvanized defects.

The cause of galvanizing defects is mainly due to the oil stain on the surface of the galvanized steel wire or the scale is not washed off, and the galvanizing process is not controlled, such as the purity of the zinc liquid, the temperature, the running speed and smoothness of the equipment, and the improper treatment of the zinc slag.

6. Poor oiling

Poor oiling is a phenomenon in which the impregnating agent and lubricant of the steel wire surface or the wire core are lacking and uneven.

The National Wire Rope Standard stipulates: “Unless otherwise required by the user, all steel wire surfaces in the wire rope should not have uncoated lubricant.” This is also a measure to improve the quality of the wire rope.

There are two types of wire rope oils used in wire rope manufacturers: one is (impregnant) hemp core grease, and the other is an outer coating agent (surface grease).

The main reasons for the poor oiling are: First, the quality of domestic oils is not enough, but the method of dip coating is not appropriate.

For example, when the steel wire rope passes through the heating oil tank, the parking time is long, the oil temperature is too high, and the oil is evaporated or leaked, which may cause oiling failure.