If the power tools are malfunctioning or damaged, do not disassemble them by yourself. They must be sent to professional maintenance personnel for maintenance. This will ensure the safety of the power tools being repaired.
Examples of Safe Use of Handheld Electric Tools
Classification of Handheld Electric Tools
Hand-held electric tools are often used in labor, and the incidence of electric shock accidents is very high. To this end, the national standard divides hand-held electric tools into three categories:
Class I hand-held electric tools have rated voltage of 220_or more, and only general insulation inside. Zero (ground) protection and leakage protector or safety isolation transformer must be installed when using. This kind of tool housing is generally all metal.
Although the rated voltage of Class II tools is 220_and above, there are two-layer or double-layer insulation inside them. The safety performance of Class I tools is excellent, but the measures taken by Class I hand-held electric tools should also be taken when using them. In order to distinguish type I tools, the label of type II tools is marked with the word "Hui". This kind of tool shell generally has two kinds of metal box and non-metal, but the handheld part is non-metal.
Class III tools are powered by safe voltage, and the rated voltage is no more than 42. The safety performance of Class I tools and Class II tools is obviously better than that of Class I tools and Class II tools. The shell of this kind of tool is all plastic.
Matters needing attention
Because hand-held electric tools need to be moved frequently in the use process, and staff often contact with them, and they are often used in the case of tight grip, so the danger is relatively high. The following points should be paid special attention to in the use of hand-held electric tools:
1. Choose type II tools in general places. If type I tools are used, leakage protectors and safety isolation transformers must be used. Otherwise, the user must wear insulating gloves, insulating boots or stand on the insulating platform (cushion).
2. Type II or III tools should be selected for operation in wet places or on metal frames. If I tool is used, a leakage protector with rated leakage current of no more than 30 mA and operating time of no more than 0.1 seconds must be installed.
3. Class III tools should be used in narrow places. If type II tools are used, leakage protectors with rated leakage current of no more than 15 mA and operating time of no more than 0.1 seconds must be installed.
4. Before use, check whether the tool shell and handle are broken or damaged, whether the zero (ground) connection is correct, whether the wires and plugs are intact, whether the switch works normally and flexibly, whether the electrical and mechanical protective devices are intact, and whether the tool rotation part is flexible.
Code for safe operation of electric hammer
1. Personal protection when using electric hammer
1.1. Operators should wear protective glasses to protect their eyes. When facing upward, they should wear protective masks.
1.2. Earplugs should be plugged during long-term operation to reduce the influence of noise.
1.3. Side handle and hands should be used in operation to prevent the reaction force from spraining the arm when blocking rotation.
1.4. When working on a ladder or at a high place, measures for falling from a high place should be taken, and the ladder should be supported by people on the ground.
2. Precautions Before Work
2.1. Verify that the power supply connected to the site is consistent with the electric hammer nameplate. Are there leakage protectors connected?
2.2. Drill bit and gripper should be adapted and properly installed.
2.3 When drilling walls, ceilings and floors, it is necessary to confirm whether cables or pipelines are buried or not.
2.4 When working at high altitude, we should pay full attention to the safety of the objects and pedestrians below, and set up warning signs when necessary.
2.5. Make sure that the switch on the hammer is cut off. If the power switch is turned on, the hammer will turn unexpectedly and immediately when the plug is inserted into the power socket, which may lead to the danger of personal injury.
2.6. If the work place is far away from the power supply, when it needs to extend the cable, it should use enough capacity to install qualified extension cable. Extended cables should be elevated if they pass through pedestrian walkways or measures should be taken to prevent them from being damaged by rolling.
Code for safe operation of hand drills
1. When using a hand drill, you must wear insulating rubber gloves and rubber shoes. When working in wet places, it is necessary to stand on insulating mats or dry wooden boards to prevent electric shock.
2. The electric drill case must be protected by grounding wire or neutral wire.
3. Electric drill conductors should be well protected, and random towing should be strictly prohibited to prevent rolling and cutting. It is not allowed to drag wires into oil and water to prevent oil and water from corroding wires.
4. If leakage, vibration, high heat or abnormal noise of electric drill is found in use, it should stop working immediately, find professional electrician for overhaul, and not disassemble and assemble by oneself.
5. When the electric drill does not stop turning completely, the drill bit cannot be unloaded and replaced.
6. When power failure, rest or leaving work place, power supply should be cut off immediately.
7. When using piezoelectric drill, the vertical workpiece of the electric drill must be used, and the fixed end should be especially firm. Do not press a hand drill with a bar.
8. Rubber gloves and other insulating articles should not be placed randomly. When the work is finished, the electric drill and insulation should be put in the designated place together.
Code for safe operation of angular polisher
1. The inspection before operation shall meet the following requirements:
The shell and handle are not cracked or damaged.
Cable soft wires and plugs are intact, switching operation is normal, and zero connection is protected correctly and firmly.
The protective cover of each part is complete and firm, and the electrical protection device is reliable.
2. Wear insulating gloves when using. After the machine starts, it should run without load. It should check and confirm that the linkage of the machine is flexible and unimpeded. When working, the force should be steady and not too strong.
3. When using grinding wheel tools, the cushion between the grinding wheel and the connecting disc should be checked and installed firmly. The nuts should not be too tight. Whenever the grinding wheel is damped, deformed, cracked, broken, edged notched or contacted with oil or alkali, it should not be used, and the damped grinding wheel should not be dried by itself.
4. The grinding wheel should be reinforced with fibre resin. The starting speed of the safety line should not be less than 80m/s. The cable and plug should have enhanced insulation performance and should not be replaced arbitrarily.
5. In grinding operation, the grinding wheel and the working face should be kept at an inclined position of 15 ~30. In cutting operation, the grinding wheel should not be inclined and should not swing laterally.
6. It is strictly forbidden to overload. During operation, attention should be paid to the sound and temperature rise. When abnormal conditions are found, the machine should be stopped and checked immediately. When the operating time is too long and the temperature of the machine exceeds 60 degrees, the machine should stop and work after natural cooling.
7. During the operation, the cutting tools, abrasives and grinding wheels should not be touched by hand. If they are found to be blunt and damaged, they should be stopped immediately to repair or replace, and then continue the operation.
8. When the machine rotates, it must not let go.
Maintenance of Handheld Electric Tools
1. Handheld electric tools must have special management, regular maintenance and sound management system.
2. Appearance inspection and electrical inspection should be carried out before each use.
Appearance inspection includes: whether the shell and handle are cracked or damaged, whether the fasteners are complete and effective; whether the soft cables or wires are intact, whether the protection of zero (ground) is correct and firm, whether the plugs are intact; whether the switching action is normal, flexible and intact; whether the electrical and mechanical protective devices are intact; whether the tool rotation part is flexible and barrier-free, and whether the card is intact. The head is strong.
Electrical inspection includes: normal reaction after electrification, effective switch control; no leakage after electrification, correct signal indication and normal automatic control; for rotating tools, observation of brush sparks and sound after electrification should be normal.
3. The maintenance of hand-held electric tools should be carried out by full-time personnel. The original protective performance of the repaired tools should not be reduced. The original insulating liner and bushing inside the tool shall not be removed or replaced arbitrarily. The insulation resistance of the repaired tools is tested by 500V megohm meter. The first type is not less than 2M, the second type is not less than 7M, and the third type is not less than 1M. After overhaul, AC withstand voltage test should be carried out for the tools. The test voltage standards are: Class I - 950V, Class II - 2800V, Class III - 380V.