Handheld electric tools, such as drills, curved saws, oblique saws, wrenches, and welding tongs, are indispensable small electric tools in construction. They are designed to be held by hand or suspended for easy operation. However, the use of these tools must also follow certain safety operating procedures to ensure the safety of operators. Next, we will provide a detailed introduction to the safety operating procedures for small electric tools.

1. Purpose and Scope of Application of the Regulations

1.1 Purpose

Ensure the safety of using handheld power tools and the normal operation of the equipment through standardized operation.

1.2 Scope of Application

The regulations apply to the safe operation of tools such as hand drills, angle grinders, cutting machines, and electric hammers.

2. Key points for safe operation

2.1 Pre use inspection

When using handheld power tools, the following safety operation points must be strictly followed to ensure the safety of operators and the normal operation of equipment:

Confirm that the tools and accessories are intact, the wires are not exposed, the plugs and sockets are intact and comply with specifications.

Wear protective equipment such as goggles and masks to prevent eye injuries from splashes and inhalation of dust.

Before use, ensure that the tools casing, handle, switch, and other parts are intact and undamaged, and that the mechanical protective device is securely installed. For angle grinders, it is necessary to carefully inspect the grinding wheel blades for any gaps or damages to ensure safe use. The condition of the belt of the cutting machine also needs to be monitored, and whether there is any damage should be checked, and the belt tension should be adjusted to an appropriate level. The state of the drill bits of electric drills and hammers can also affect safety during use, and it is necessary to check whether the drill bits are bent or deformed.

2.2 Precautions for use

During the operation, it is necessary to keep the hands dry and clean, follow the instructions of the equipment, adhere to the instructions, and avoid overloading or improper use that may cause accidents. Meanwhile, appropriate distance should be maintained during use to avoid electric shock or mechanical injury. After the operation is completed, the power should be turned off in a timely manner, the site should be cleaned, and the tools should be stored properly.

After the machine is started, it should be allowed to run without load and the linkage should be confirmed to be flexible and unobstructed before starting the operation. When operating, apply force steadily and avoid excessive force. During the operation, close attention should be paid to the sound and temperature rise changes during the work. If any abnormalities are found, the machine should be stopped immediately for inspection. If the temperature rise of the machinery exceeds 60 ℃, it should be stopped and allowed to cool naturally before continuing operation. In addition, attention should be paid to not touching rotating parts such as cutting tools, drill bits, and grinding wheels with hands during tool use. When parts become dull or damaged, they should be immediately repaired or replaced to ensure normal operation before continuing work.

In addition, when using an electric hammer to drill holes, the drill bit should be pressed against the working surface first, and then applied with moderate force. If the speed drops sharply, the force should be reduced to prevent motor overload. The electric drill and hammer operate on a 40% intermittent working system and should not be used continuously for long periods of time to prevent overheating and damage. In case of unexpected shutdown, the switch on the handheld electric tool, especially the angle grinder, should be quickly turned off to prevent sudden operation without turning off the switch and causing injury.

When using handheld electric tools in narrow places such as boilers, metal containers, trenches, pipelines, etc., it is advisable to choose Class III tools with isolation transformers. If using Class II tools, splash proof leakage protection devices must be installed, and isolation transformers or leakage protection devices must be installed outside narrow areas while maintaining supervision.

2.3 Key points of maintenance and repair

Daily inspection and maintenance are important steps to ensure the continuous and safe operation of tools, including checking whether the casing, plugs, switches, and other components are intact, and regularly measuring insulation resistance. When measuring insulation resistance, use a 500 volt megohmmeter. The insulation resistance value for Class I tools should reach 2 megohms, Class II tools should be 7 megohms, and Class III tools should be 1 megohm. If the tool is left unused for a long time, insulation resistance measurement must be carried out before use.

Non professionals are not allowed to disassemble or repair tools without authorization to ensure safe use. The strict implementation of safety operating procedures can effectively improve the service life of equipment and ensure the safety of operators.