Lift overturn cause appraisal

Lift is a mechanical device that uses hydraulic, electrical or human energy to lift people, objects or working platforms to a certain height. The overall overturning of the elevator refers to the situation where the entire elevator overturns to one side or in multiple directions due to imperfect infrastructure or unstable overall structure during lifting of heavy objects or during operation. This is a serious industrial accident that can result in casualties and equipment damage, among other consequences.
In the case of lift overturning cause identification cases, Zhongke Testing can provide lift overturning cause identification services.

1, improper use and operation
When using the lifting platform in daily work, it is not operated according to the usage specifications, causing the equipment to be unbalanced. Long-term unstable operation can easily aggravate equipment wear and cause the tilt of the platform table.
2, Lifting platform bottom frame tilt
Some small-scale manufacturers lack high-precision cast iron platforms. Since workers manually weld and control the bottom frame, it is difficult to ensure product accuracy by human eyes alone. The level of workers is uneven, and product quality is not stable enough. The lift should use a high-precision cast iron platform, and all platform chassis manufacturing is completed on the high-precision cast iron platform. Only in this way can the quality and level of the chassis product be effectively guaranteed.
3. Manufacturer quality cannot be guaranteed
. In order to save money, many defective manufacturers do not purchase and use hole spacing positioning devices, but only rely on workers’ experience to control the hole spacing, resulting in inconsistent hole spacing and serious inclination of the lifting platform during the lifting process.

GB/T 27548-2011 Mobile elevating work platform Safety rules, inspection, maintenance and operation
GB 25849-2010 Mobile elevating work platform Design calculations, safety requirements and test methods
GB/T 26557-2021 Cage vertically guided construction lift for people and goods
JGJ 215-2010 Safety Technical Regulations for Installation, Use and Dismantling of Construction Lifts (Explanation of Articles)
GB 5083-1999 General Principles for Safety and Hygiene Design of Production Equipment

According to the situation reported by the client and the information provided, the workers of the fire equipment engineering company were installing fire sprinklers in the first section of the library, and the mobile lifting platform operated by the workers overturned.
In order to further identify the cause and responsibility of the accident, the client hopes to conduct a quality analysis on whether there are quality problems with the lift.
appraisal analysis results: The
quality analysis expert group discussed and comprehensively analyzed the relevant information and on-site investigation and inspection of the "lift truck (mobile lifting platform)" involved, and made the following quality analysis and appraisal opinions:
1. The driving safety protection device of the "lift truck (mobile lifting platform)" involved in the incident failed, causing the "lift truck (mobile lifting platform)" to be able to operate and walk in the lifting position, which was the main reason for the "lift truck (mobile lifting platform)" to tip over;
2. The "lift truck (mobile lifting platform)" involved was walking and braking under the load condition of the maximum lifting height (12m). Its overturning moment was greater than its stable moment, which was the direct cause of the overturning of the "lift truck (mobile lifting platform)";
3, The "lift truck (mobile lifting platform)" involved in the incident has not carried out necessary inspections and maintenance as required for a long time, resulting in greater safety hazards in the "lift truck (mobile lifting platform)", which is an indirect cause of the overturning of the "lift truck (mobile lifting platform)".