Tractor quality appraisal

A tractor refers to a vehicle specially used to tow trailers, trailers and other load-carrying vehicles. It is also called a tractor, tractor, traction tractor, etc.
tractor is composed of chassis, cab, power system, braking system, suspension system, steering system, electrical system, etc. Among them, the power system is the core part of the tractor, including the engine, gearbox, drive axle, etc. The braking system is more important, including air braking system and hydraulic braking system. The steering system is the part used to control the steering of the front wheels of the tractor, and the suspension system is an important guarantee for ensuring the smooth driving of the vehicle.
In the case of tractor quality appraisal, Zhongke Testing can provide tractor quality appraisal services.

1. Ordinary tractor: Ordinary tractor is a vehicle commonly used for transporting large goods on the road.
2. Walk-behind trailer: A walk-behind trailer is a small truck, suitable for transporting simple and light cargo.
3. Trailer tractor: Trailer tractor is mainly used to pull various types of trailers, including container trailers, flatbed trailers and semi-trailers.
4. Modular tractor: A modular tractor is a multi-axle drive, very large vehicle that can be used in mountainous areas or large construction sites, and is suitable for driving in areas with more restrictions on the road.

MH/T 6048-2020 Luggage/cargo tractor
JT/T 1178.2-2019 Safety technical conditions for operating trucks Part 2: Towing vehicles and trailers
JB/T 10750-2018 Tractor
JT/T 880-2013 Port tractor
MT/T 988-2006 Infinite rope continuous tractor
GB/T 30465-2013 Agricultural machinery Mechanical connection between the towing vehicle and the towed vehicle Agricultural implement hitch rings and connection devices connected to the tractor traction device
GB/T 39015.2-2020 Road vehicles Interchangeability of mechanical connections between tractors and semi-trailers Part 2: Low traction seat semi-trailer tractors and large-volume semi-trailers
GB/T 23419-2009 Design performance requirements for four-wheel drive aircraft tractors
GB/T 13881-2019 Road vehicles Air brake pipe connector between tractors and trailers
GB/T 20070-2006 Road vehicles - Interchangeability of mechanical connections between tractors and semi-trailers
0GB/T 35350-2017 Mechanical connection devices between tractors and towed vehicles - Requirements and test methods
1GB/T 20716.1-2006 Road vehicles - Electrical connectors between tractors and trailers Part 1: Connection of braking system and traveling system of 24V nominal voltage vehicles
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A freight forwarder purchased a tractor with a towing weight of 37 tons for cargo transportation. Half a year later, the driver Yu discovered something abnormal in the wheel while driving. At the instruction of the company, he went to the repair shop for maintenance. After the inspection,
maintenance staff Wang discussed with Yu to disassemble the rear wheel for detailed inspection to find out the cause of the friction. Yu agreed. However, when Wang was dismantling the wheel, the tire rim blew off and Wang was seriously injured. Unfortunately, he died when he was sent to the hospital for rescue.
was entrusted by the public security agency to conduct an appraisal and analysis on "whether there are quality problems" with the tractor involved in the case.
appraisal analysis results: The
appraisal analysis expert group discussed the relevant information and on-site investigation of the tractor involved and made a comprehensive quality and technical analysis, and made the following suggestions and conclusions:
based on the design drawings provided by the tractor manufacturer, it was found that the welds represented in the drawings were all circumferential welds, but in the actual inspection the outer ring welds were intermittent four-section welds, which were different from the design in the drawings. The fracture location was near the heat-affected zone of the weld. From the process documents, it can be found that there was no treatment work before and after the wheel hub was welded, resulting in a relatively weak welding heat-affected zone.
In addition, it was also found from the information provided that at the time of the accident, the actual load of the vehicle involved was close to 60 tons, far exceeding the 37-ton load mark.
In summary, there are defects in the manufacturing process of the vehicle. At the same time, the vehicle involved has been severely overloaded for a long time, resulting in fatigue damage and continuous expansion of cracks. Vehicle users also lack regular inspection and maintenance of their vehicles. Various reasons lead to accidents.