Hydraulic Wrenches: Effective Shock Protection for Handheld Power Tools.Introduction of hydraulic wr

　　In general workplaces, leakage protectors, isolation transformers, etc. should be equipped when using Class I tools. Class II or III tools should be used in wet places. If Class I tools are used, a leakage protector with an operating current of not more than 30μA and an operating time of not more than 0.1s must be installed. When working in boilers, metal containers, and pipes, Class III tools or Class II tools equipped with leakage protectors should be used. The operating current of the leakage protector is not more than 15μA, and the operating time is not more than 0.1s. In special environments such as hot and humid, rain and snow, explosive or corrosive gases and other working environments, tools with corresponding protection levels and safety technical requirements should be used.

　　During installation and use, the safety isolation transformer of Class III tools, the leakage protector of Class II tools, the control box and power supply device of Class II and III tools should be kept away from the workplace. The power lead of the tool should be a tough rubber-covered wire or a plastic-sheathed soft copper wire. The protective grounding resistance shall not be greater than 4Ω. During operation, the protective cover of the running parts shall not be disassembled, and the grinding tool should be stopped when changing the tool.

　　Wear rubber insulating gloves, and if necessary, wear insulating shoes or stand on insulating pads, except that the voltage of 36V and below is used, the secondary winding of the power supply isolation transformer is not grounded, and the power supply circuit is equipped with a low-voltage leakage protector with reliable operation. The operating isolation transformer should be the primary and secondary double windings, the secondary windings should not be grounded, and the metal shell and iron core should be reliably grounded. Terminals should be closed or shielded. The primary winding should be specially equipped with a fuse, controlled by a bipolar knife, the lead wire length should not exceed 3m, and there should be no joints.

　　Before and after the tool is used, the custodian must carry out daily inspection, and the user should check before use. The contents of daily inspection include: whether the shell and handle are damaged and cracked, whether the mechanical protection device is in good condition, whether the rotating part of the tool is flexible, light and unobstructed, whether the electrical protection device is in good condition, whether the connection of the protection wire is correct and reliable, whether the power switch is normal and flexible, and whether the power plug and the power cord is intact. Problems found should be repaired or replaced immediately.

　　It should be inspected regularly by full-time personnel at least once a year. In areas with frequent changes in humidity and temperature or in places with harsh operating conditions, the inspection period should be shortened accordingly. It should be checked in time before the rainy season. In addition to the above checks, a 500V megohmmeter should be used to measure the insulation resistance of the circuit to the casing. For tools that have been left unused for a long time, the insulation must also be checked before use. Class I tools should be less than 2MΩ, Class II tools should be less than 7MΩ, and Class III tools should be less than 1MΩ; otherwise, dry treatment or maintenance should be performed.

　　The maintenance of tools should be carried out by a specially designated maintenance department, equipped with the necessary inspection equipment. The original design parameters of the tool shall not be arbitrarily changed, substitute materials with lower performance than the original shall not be used, and parts that do not conform to the original specifications shall not be replaced. The insulating gaskets and bushings in the tool shall not be installed or removed arbitrarily.

　　After maintenance, the insulation should be measured, and the withstand voltage test should be done between the live parts and the casing. The withstand voltage test voltage of class I tools isolated from live parts by basic insulation is 950V, class III tools is 380V, and the test voltage of class II tools isolated from live parts by reinforced insulation is 2800V.

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