Grading machine quality appraisal

grader is a mechanical equipment used for plowing and land preparation. It can be used to loosen and plow the soil deeply before planting crops, improve the soil structure, and remove weeds and other impurities. The grader is composed of a cutting blade, a plowing disc, a transmission mechanism and a support mechanism. The working principle of the grader is to cut the soil through the cutting blade, and then turn and mix the soil through the tilling disc to make it looser and achieve better aeration and water permeability.
grader is an important part of the development of modern agriculture, and its use can significantly improve the output and quality of agricultural products. As the population continues to grow and urbanization accelerates, the demand for agricultural products is gradually increasing, requiring agricultural production to be more efficient, more productive, and of higher quality. As an important tool in modern agricultural production, the grader has broad application prospects.
In the case of grader quality appraisal, Zhongke Testing can provide grader quality appraisal services.

motor graders are available in two types: towed type and self-propelled type.
towable grader is towed by a tractor, and its working devices are operated manually; the self-propelled grader is equipped with an engine on its frame to provide power to drive the machinery and various working devices to work. The former had poor maneuverability and laborious operation, so it was replaced by the latter.
self-propelled motor graders are classified in many ways. According to different control methods, they can be divided into mechanically controlled and hydraulically controlled types;
can be divided into four-wheeled and six-wheeled based on the number of wheels;
can be divided into wheel-driven Depending on the situation, it can be divided into two types: rear-wheel drive and all-wheel drive;
can be divided into front-wheel steering and all-wheel steering according to different wheel steering conditions;
can be divided into three types: light, medium and heavy based on engine power and scraper length.

GB/T 8506-2008 Grader Test Method
GB/T 14782-2021 Earthmoving Machinery Grader Technical Conditions
GB/T 41109-2021 Earthmoving Machinery Grader Fuel Consumption Test Method
GB/T 7920.9-2020 Earth-moving machinery Graders Terminology and commercial specifications
GB/T 25684.8-2021 Earth-moving machinery Safety Part 8: Requirements for graders
GB/T 21940-2008 Earth-moving machinery Blades for bulldozers, graders and scrapers Main shapes and basic dimensions

The plaintiff and the defendant signed an Industrial Products Sales Contract, stipulating that the plaintiff purchased three model XX graders from the defendant.
The plaintiff put the three graders into use. However, during the construction process, the grader started to emit black smoke from the engine exhaust pipe after 25 hours of operation, abnormal noise from the gearbox, and oil leakage from the balance box. After 55 hours of operation, oil began to emit from the exhaust pipe and blue smoke emitted from the engine exhaust pipe. After the manufacturer's normal after-sales maintenance inspection and multiple treatments, the problems that emerged have still not been resolved, which has seriously affected the normal use and work progress of the plaintiff company.
In order to further identify the cause and responsibility of the accident, the client hopes to determine whether there are quality problems with the "grader" involved and apply for a quality analysis of the product.
identification and analysis results: The
quality analysis expert team conducted a situational understanding, relevant tests and comprehensive technical analysis of the "grader" involved, and made the following quality analysis opinions:
1. No factory numbers 100 and 120 were found. There are abnormal phenomena in the technical condition of the XX type grader engine;
2. The XX type grader with factory number 130 has oil leakage in the balance box and main reducer, and abnormal noise in the gearbox. The oil leakage in the balance box and main reducer is a manufacturing or maintenance defect, and the abnormal noise in the gearbox is a product quality defect.