On the 21st, the State Administration for Market Regulation reported on the national supervision and spot check of the quality of steel wire ropes, grinding wheels, and new wall materials (bricks and blocks) in 2021. The quality of steel wire rope products must be carefully controlled. This news serves as a reminder for elevator operators. The article is quite lengthy, so you can directly scroll down to the following picture to see the manufacturers of unqualified steel wire ropes. take warning. (Remember to forward it to the elevator personnel around you, mine clearance)

According to reports, 686 batches of steel wire ropes, grinding wheels, and new wall materials (bricks and blocks) produced by 634 enterprises were randomly inspected, and 120 batches of products were found to be unqualified, with a failure rate of 17.5%. During this follow-up inspection, 93 companies were found to have failed the previous inspection, with 19 companies still failing and 74 companies passing the inspection.

In this spot check, Jianda New Building Materials Co., Ltd. in Qingfeng County, Puyang City, Henan Province, violated the provisions of the Product Quality Law of the People's Republic of China and refused to accept supervision and spot checks without justifiable reasons.

Specifically, the failure rate of wire rope spot checks is 10.2%. This time, 187 batches of steel wire rope products produced by 135 enterprises in 13 provinces (regions, cities) were randomly inspected, and 19 batches of products were found to be unqualified. The unqualified rate of the spot check was 10.2%, a decrease of 0.3 percentage points from the last spot check.

The focus of this spot check was on 25 items including wire rope breaking force, wire rope diameter, and wire rope chemical composition. The non-conforming items involved 9 items, including tensile strength, torsion, interlacing, wire rope diameter, wire diameter, center wire diameter, oil content of the wire rope, wire rope breaking force, and coating weight of the wire rope. During the spot check, it was found that the tensile strength of the steel wire for 5 batches of products was found to be unqualified, posing a safety hazard. The steel wire interlocking project of 4 batches of products is not qualified, which affects the stability of the steel wire rope structure. According to the analysis of the technical institution, the main reasons for the non conformance are: firstly, the rope making steel wire was not produced according to the required grading, with rust or low coating weight; The second issue is the unreasonable design of process parameters such as twisting, knotting, or oiling; Thirdly, the quality control of the manufacturing process is not strict.

The focus of this inspection was on production enterprises in the industrial agglomeration area of Jiangsu Province, with a total of 131 batches inspected and a failure rate of 8.4%.

The failure rate of grinding wheel spot checks is 18.6%. This time, 156 batches of products produced by 156 enterprises in 16 provinces (regions, cities) were randomly inspected, and 29 batches of products were found to be unqualified. The unqualified rate of the spot check was 18.6%, an increase of 0.6 percentage points compared to the last spot check. The failure rates of spot checks on this product in the past three years were 13.0%, 18.0%, and 18.6%, respectively.

The focus of this spot check was on 7 items including rotational strength, aperture, unbalance, black core, crack, mute sound, and hardness. The unqualified items involved rotational strength, aperture, unbalance, and hardness. It was found that 26 batches of products had unqualified aperture items during the spot check. According to analysis by technical institutions, the main reasons for non-compliance are unreasonable product design or formulation, improper selection of binders, and inadequate control of the manufacturing process.

This inspection focused on the production enterprises in four industrial clusters in Zhejiang Province, Henan Province, Jiangsu Province, and Shandong Province. 32 batches, 25 batches, 24 batches, and 22 batches of products were inspected respectively, and the failure rates were 21.9%, 4.0%, 12.5%, and 50.0%.

The failure rate of spot checks on new wall materials (bricks and blocks) is 21.0%. New wall materials (bricks and blocks) refer to brick and block wall materials mainly produced from coal gangue, shale, fly ash, sand, stone, etc. They are commonly used for load-bearing walls, partition walls, and internal and external insulation walls of buildings. This time, 343 batches of products produced by 343 enterprises in 30 provinces (regions, cities) were randomly inspected, including sintered porous bricks and porous blocks, load-bearing concrete porous bricks, sintered hollow bricks and hollow blocks, and autoclaved aerated concrete blocks. 72 batches were found to be unqualified, with a failure rate of 21.0%, a decrease of 13.5 percentage points from the previous inspection. The failure rates of this product in the last three national supervision spot checks were 25.5%, 34.5%, and 21.0%, respectively.

This spot check focused on 18 items including thermal conductivity, radioactivity, frost resistance, weathering resistance, porosity, density grade, and strength grade. The unqualified items involve 9 items including hole structure and hole rate, strength level, hole rate, frost resistance, hole arrangement and structure, strength level, dry density level, radioactivity, density level, etc. According to analysis by technical institutions, the main reasons for the unqualified product are: firstly, outdated enterprise management, inadequate understanding of standards, and lax internal quality control; Secondly, enterprises excessively compress production costs and use raw materials of poor quality.

The focus of this inspection was on the products of production enterprises in four provinces including Guangdong, Shandong, Zhejiang, and Henan. 27 batches, 25 batches, 23 batches, and 23 batches of products were inspected and tested respectively, and the failure rates were 11.1%, 32.0%, 13.0%, and 13.0%. In addition, 21 batches of products produced by enterprises in the Guangxi Zhuang Autonomous Region were spot checked, and 8 batches of products were found unqualified. 14 batches of products produced by enterprises in Jiangsu Province were spot checked, and 6 batches were found unqualified. 4 batches of products produced by enterprises in the Xizang Autonomous Region were spot checked, and 4 batches were found unqualified.