Email Us
Lifting & Lashing Equipment Quality Control

Quality Control

Quality is our eternal promise to the customers. Safety, nice appearance, stable performance, and long service time are the basic factors to qualify ZH products. Our products comply with different standards. EN standards of forging for different parts are all adapted accordingly while EN standards (EN1065, EN13377, etc.) are also adapted in the production of our key components.

Quality & Safety

We have regular quality analysis meetings because: 


Quality is our eternal promise to the customers


Safety, nice appearance, stable performance, and long service time are the basic factors to qualify WAC products.

Lifting & Lashing Equipment Quality Control

QC System

Type testing

In order to prove the design, material, heat treatment and method of manufacture, each size of component and chain in the finished condition has been type tested in order to demonstrate that the component and chain possess the required mechanical properties. The following testing procedures are particularly relevant.

Test for deformation

The Manufacturing Proof Force (MPF) for the relevant size of the component is applied and released. The dimensions after proof loading shall not alter from the original dimensions within the tolerances prescribed in the international standards.

Static tensile test

The Breaking Force (BF) for each component and size is verified. The verified value shall be at least equal to the Minimum Breaking Force (MBF) value. The MBF value is equal to the Woking Load Limit (WLL) multiplied by the safety factor.

Fatigue test

By fatigue testing in pulsator testing machines the toughest service conditions are simulated.

Manufacture testing

During manufacture, continuous manufacturing tests are carried out according to the requirements of the latest international standards. The following testing procedures are particularly relevant.

Non destructive test/inspection

3% of every production batch of forged components is subject to magnetic particle or dye penetrating examination. Visual inspection is carried out on each chain link and forged component to eliminate defects.

Proof force

Each individual component and chain link is tested to the Manufacturing Proof Force (MPF) level before delivery. The MPF level is 2,5 times the WLL, equal to 62,5% of the Minimum Breaking Force.

Static tensile test and ultimate elongation test

During manufacture of chain and master links, samples are tested and the Minimum Breaking Force (MBF) value and the total ultimate elongation are verified.

Bending deflection

During the manufacture of chain and master links, samples are taken and the minimum bend deflection verified.

For any item small like tie rods or big as a self-climbing formwork bracket, and for any item produced by our own workshops or outsourced from others, we have a corresponding quality control system which strictly runs throughout the whole phases of order delivery, from incoming raw materials inspection, manufacturing process inspection till finished products inspection.

Lifting & Lashing Equipment Quality Control

Laboratory

Our Laboratory testing machinery are available testing for:


  • Hardness test


  • Impact test


  • Breaking load test


  • Chemical analysis


  • Spectral analysis

Materials

For any item small like tie rods or big as a self-climbing formwork bracket, and for any item produced by our own workshops or outsourced from others, we have a corresponding quality control system which strictly runs throughout the whole phases of order delivery, from incoming raw materials inspection, manufacturing process inspection till finished products inspection.


Despite internal quality control from production to inspection, we also work with third-party laboratories for the load capacity test, certification, or pre-shipment inspection, all for the purpose of making products reliable and better.


"We are always proud and confident to say, ZH's materials successfully maintained a much better appearance and performance in the past years and will continue its excellence in the new decades.”, our Chief Engineer Chuanfeng Ju said.

Lifting & Lashing Equipment Quality Control
E-mail:
a.liu@zhongheindustry.com
Tel:
86-(0)532-84530801
Add:
No.7 LingTong RD, LingShan Town, Jimo, Qingdao, China