Electric hoist quality appraisal

Electric hoist is an electric equipment that can lift objects. It usually consists of a motor, gear box, lifting pulley, wire rope and control system. It drives the rotation of the gearbox through the electric motor and drives the rotation of the lifting pulley to lift or lower the goods with the wire rope.
Zhongke Testing and Appraisal Institute can provide quality appraisal services for metallurgical wire rope electric hoists, marine wire rope electric hoists, low static air wire rope electric hoists and other electric hoists, and make accurate appraisals in terms of product design analysis, load analysis and product quality analysis.

Electric hoists can be divided into two categories: wire rope electric hoists and chain electric hoists:
Among them, wire rope electric hoists are classified into many categories, according to the use environment and purpose: CD1, MD1, HC, HM wire rope electric hoist, explosion-proof wire rope electric hoist, metallurgical wire rope electric hoist, marine wire rope electric hoist, low static air wire rope electric hoist, multi-function hoist, micro electric hoist, DC wire rope electric hoist and other non-standard wire rope electric hoists.
electric chain hoist can be divided into single hanging electric hoist and group hanging electric hoist according to the usage.

JB/T 5317-2016 Electric chain hoist
JB/T 9008.2-2015 Electric wire rope hoist Part 2: Test method
JB/T 9008.1-2014 Electric wire rope hoist Part 1: Type and basic parameters, technical conditions
JB/T 10222-2011 Explosion-proof electric hoist
JB/T 5663-2008 Electric hoist gantry crane
JB 5317.2-1991 Technical conditions of chain electric hoist
JB 5317.3-1991 Conical rotor motor for chain electric hoist
JB 9009-1999 Wire rope electric hoist Safety regulations
JB/T 3695-2008 Electric hoist bridge crane
JB 5663.2-1991 Electric hoist gantry crane Technical conditions
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A manufacturing company signed a contract to purchase an electric hoist with a machinery manufacturing company, and the machinery manufacturer was responsible for installing it. After it was installed and put into use, the hoist screw of the freight elevator in the factory broke and the freight elevator fell, causing injuries and causing heavy losses to the company. The manufacturing company suspected that there was a quality problem with the electric hoist and asked the machinery manufacturing company to take responsibility.
Our company was entrusted by the court to undertake the quality analysis of the "electric hoist" involved in this case.
identification and analysis results: The
quality analysis expert group discussed and comprehensively analyzed the relevant information, on-site investigation and inspection data, and inspection and testing data of the "electric hoist" involved in the case, and made the following quality analysis opinions:
involved in the case The output spline shaft of the "electric hoist" has not been quenched and tempered, and its strength and hardness are relatively low. During the production process with heavy loads, there is a risk of breakage; the output spline shaft of the reducer breaks, and the reducer loses connection with the drum, causing the drum to completely lose braking, causing the mold and bracket to fall under their own weight, causing injuries.