It may vary widely in terms of appearance, grip comfort, noise and vibration, service life, work efficiency, and quality of parts. The professional users of electric tools not only pay attention to the safety of the tools, but also pay more attention to the indicators of their performance.

With the continuous increase in the export volume of electric tools in China, and the increasing attention of domestic and foreign customers to the quality of electric tools, inspection agencies and foreign trade companies have also intensified the inspection of electric tools and established corresponding inspection specifications and inspection methods. In general, the inspection of power tools can be roughly divided into two parts: safety and performance, in addition to the special requirements of the foreign trade company or foreign company on the signs, nameplates, manuals, and packaging, as well as the confirmation of the actual number of orders.

Safety power tools that are generally sold in most parts of the country and abroad are certified through product certification and other certifications. Most of the above certifications are based on the fifth certification model, which means that after the initial factory inspection of the type test is certified, it will be monitored. However, the product testing performed during product certification is sent by the power tool manufacturer.

It is one of the important contents of the inspection that whether or not it can be kept in conformity with the sample delivery test during mass production. The consistency check is generally divided into two parts, namely the inspection of key components and raw materials as well as key manufacturing processes. Inspectors' hands should have a test report of the product being inspected. In the inspection report, the model, manufacturer, technical parameters and certification status of the key components and raw materials of the tested product are described in detail.

When the inspectors conduct on-site inspections, they should check whether the key components and raw materials are consistent with the certification inspection. If inconsistent, the manufacturer shall be required to provide a valid certificate of conformity after the change. In case of doubt, the inspector may ask the manufacturer to do some necessary test items to confirm. If the key production process changes, it should be treated as such. In addition, inspectors can perform tests on the insulation performance of conventional products at the site, such as leakage current, withstand voltage, creepage distance and clearance, insulation penetration distance, and so on.

It should be pointed out that when the metallic shell type tool performs the whole machine withstand voltage test, due to the use of a rotor with an insulating structure, the flashover phenomenon may occur between the air gaps of the stator and the rotor core. It is recommended to use a "fat appendix". The recommended method is to adjust the withstand voltage to adjust the setting current to .

In a broad sense, performance inspection is different from security. At present, a specific and complete inspection specification, method, and requirement have not yet been formed. Generally, inspections are performed according to the agreement between the supplier and the seller when signing a sales contract. Methods and items are checked.

The practicality, durability, etc. of the tools involved can be roughly divided into the following aspects according to the current conventional practices. Appearance of the appearance of the power tool inspection is carried out without electricity, generally include the following content: The metal shell surface coating should be free from defects, the plastic part of the uniform smooth shell, no bubbles, cracks, obvious spots and cold septa, Fasteners should be complete and effective.

Flexible cables or flexible cords and plugs should be intact and the model specifications should be the same as those described in the supply contract. The analysis method of the power tool to determine the power tool is correct and firm. Switching should be normal, flexible, and in good condition. Electrical protection devices and mechanical protection devices should be intact.

The rotating part of the tool should be flexible and accessible. The clamping mechanism for clamping the work piece should be firm and reliable. Ergonomics Ergonomics is the study of the relationship between human, machine, and environment in the “human-machine-environment” system. It provides theories and methods for solving human health and health problems in this system. It explores the regularity of people's labor, work effectiveness, and efficacy, and explores the working ability and limits of human body, so that the work that people are engaged in tends to adapt to various features of human anatomy, physiology, and psychology.

Specific to the product, that is, in the design and manufacture of the product completely tailored to the human body's physiological anatomy, more beneficial to the body's physical and mental health. The application of ergonomics to the design of electric tools means that humans are the main body, and actual measurement, statistics, and analysis are the basic research methods to study the reasonable coordination between human body structure functions, psychology, mechanics, and the use of electric tools. To meet people's physical and mental activity requirements and achieve the best use of performance.

Its goal should be safety, health, efficiency and comfort. Nowadays, due to the extensive use of ergonomics and bionics in power tools, the shape design of power tools has become the most important part of the entire tool design. The ergonomic inspection of the power tools has been determined when the tools are finalized.

In general, foreign companies commission a qualified inspection agency to carry out comprehensive ergonomic evaluation of a tool when it comes to shipping inspections. It involves easy values, work surfaces, heavy-duty operations, pressure distribution, fatigue, visual illusions, etc. . Products exported to a certain area must also conform to the laws of human disparity and size distribution in the area.

With the improvement of people's living standards and the dedication of the "people-oriented" concept, the principles of ergonomics have been widely used in tools, furniture, automobiles, computers, interior decoration and other industries.

The use of ergonomic research to design power tools is a new trend in the development of new products since the century. To vigorously carry out ergonomic research and apply it to the design of electric tools has attracted the attention of the domestic electric tool designers.

For example, a rubber sand piece is arranged on the outer surface of the handle grip of the tool. The shape of the auxiliary handle is similar to the palm of the hand, which makes the operator feel more comfortable to hold and can reduce the fatigue caused by holding the power tool for a long time. The hazards of snoring and vibration noise are well-known. They affect sleep and rest, interfere with work, interfere with conversations, impair hearing, and even cause diseases in the cardiovascular system, nervous system, and digestive system. Noise pollution has caused people's great attention, and controlling noise pollution has become a top priority.

The EU Directive lays down legal provisions for the noise pollution of outdoor equipment, including power tools and garden tools. In this directive, a method of measuring noise disks, as well as parts of power tools and garden tools such as hand-held petrol-powered brush cutters, hand-held chainsaws, pruning shears, pressure washers, gasoline or motor-driven lawn mowers, twigs The basic noise emission standards for tools such as pulverizers, gasoline engines or motor-driven concrete crushers and crucibles, the placement of tools for measurement, working conditions, and load conditions have all been clearly defined.

Under conditions, the inspection may be conducted in accordance with the methods and requirements specified by the Niger. In the absence of conditions, some simple methods can be used to make a correct judgment. Experienced inspectors can identify whether the tool has unusual noises such as gear crashes or electromagnetic noise by running the tool under no-load and load conditions.

The vibration generated when the power tool is used will be transmitted to the operator's hand and wrist, and then spread to the shoulder, causing discomfort and affecting work efficiency. What's more, if you frequently use powerful vibration tools, it will affect the body's blood vessels, nerves, bones, joints, muscles and other related organizations, resulting in vibration hazards.