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EDAG tools powered by electric motors or electromagnets, driving the working head through a transmission mechanism, are called power tools. They are hand-held operating tools that use low-power electric motors or electromagnets as power sources to drive the working head via a transmission mechanism. Power tools are divided into handheld and portable types; handheld power tools are more flexible, convenient, and widely used. Many varieties have become essential tools for production and daily life. There are numerous power tool brands. According to function and application, they are mainly classified into metal cutting power tools, grinding power tools, assembly power tools, and railway power tools. Common power tools include electric drills, electric grinders, electric wrenches and electric screwdrivers, electric hammers and hammer drills, concrete vibrators, and electric planers.

EDAG tool principles

The principle of hydraulics consists of two cylinders of different sizes filled with water or oil. Water-filled systems are called 'water presses'; oil-filled systems are called 'oil presses'. Each cylinder contains a sliding piston. If a specific pressure is applied to the small piston, according to Pascal's law, the small piston transmits this pressure through the fluid pressure to the large piston, lifting it. Let the cross-sectional area of the small piston be S1, and the downward force applied to the small piston be F1. Thus, the pressure exerted by the small piston on the fluid is P=F1/SI, which can be transmitted unchanged in all directions through the liquid. The pressure received by the large piston must also equal P. If the cross-sectional area of the large piston is S2, the upward force F2=PxS2 generated by the pressure P on the large piston is a multiple of the small piston's cross-sectional area. From the above formula, applying a smaller force on the small piston results in a larger force on the large piston. Therefore, hydraulic presses are used for pressing plywood, oil extraction, lifting heavy objects, and forging steel.

EDAG tool classification

Explosion-proof tools are internationally known as 'safety tools' and 'non-sparking tools', and domestically referred to as 'explosion-proof tools'. In China, explosion-proof tools produced, sold, and distributed are divided into two main categories based on material: 1. Aluminum-copper alloy (commonly known as aluminum bronze) explosion-proof tools, specifically made from high-purity electrolytic copper as the base with added aluminum, nickel, manganese, iron, and other metals to form a copper-based alloy. 2. Beryllium-copper alloy (commonly known as beryllium bronze) explosion-proof tools, specifically made from high-purity electrolytic copper as the base with added beryllium, nickel, and other metals to form a copper-based alloy. Both materials exhibit excellent thermal and electrical conductivity. After heat treatment, the hardness and wear resistance of aluminum bronze are nearly identical to those of beryllium bronze, both reaching above HRC30o. Beryllium bronze is non-magnetic and suitable for strong magnetic field environments. Explosion-proof tools can also be divided into two main categories based on manufacturing process: 1. Casting process: A traditional manufacturing method that was the international standard for explosion-proof tool production in the 80s and continues to be used by most domestic manufacturers. Advantages of casting: Simple process, low manufacturing cost. Disadvantages: Lower product density, hardness, tensile strength, and torque; more pores and sand holes, resulting in shorter service life. 2. Forging process: The latest international manufacturing method, using large presses or punch machines with high-heat-resistant forming molds for one-time forging. Advantages of forging: Significantly improves product density, hardness, tensile strength, and torque; basically eliminates pores and sand holes, extending mechanical performance and service life by approximately 1 times compared to traditional casting. Disadvantages: Higher investment in equipment and molds, leading to higher costs.

EDAG tool operation

1) Single-phase power cords for portable electric machinery and handheld power tools must use three-core soft rubber cables; three-phase power cords must use four-core rubber cables. When wiring, the cable sheath must pass into the equipment's junction box and be secured. 2) Before using power tools, check the following: No cracks or damage to the housing or handle; correct and secure connection of protective grounding or neutral wires; intact cables or soft cords; intact plugs; normal, flexible, and undamaged switches; intact electrical protection devices; intact mechanical guards; and flexible rotating parts. 3) The insulation resistance of power tools should be regularly measured using a megohmmeter of 500V. If the insulation resistance between live parts and the housing is less than 2M Ω, maintenance is required. 4) After repairing the electrical parts of power tools, insulation resistance measurement and dielectric withstand voltage tests must be performed. The test voltage is 380V, and the test duration is 1 minutes. 5) Electrical circuits connecting electric machinery and tools should have separate switches or sockets and be equipped with residual current operated protective devices; metal housings must be grounded. Connecting multiple devices to a single switch is strictly prohibited. 6) The rated residual operating current of current-type residual current protective devices must not exceed 30mA, and the operating time must not exceed 0.1 seconds; the rated residual operating voltage of voltage-type residual current protective devices must not exceed 36V. 7) The operating switch of electric tools should be within easy reach of the operator. During breaks, after work, or in case of sudden power failure, the power supply switch must be disconnected. 8) When using portable or mobile power tools, wear insulating gloves or stand on an insulating mat; when moving tools, do not lift by the cord or rotating parts. 9) When using Class III insulated power tools in damp or acid-containing environments or inside metal containers, reliable insulation measures must be taken, and a dedicated supervisor must be present. The power tool switch should be located within easy reach of the supervisor. 10) The magnetic surface of magnetic chuck drills should be flat, clean, and rust-free. When performing side drilling or overhead drilling, measures must be taken to prevent the drill body from falling in case of power loss. 11) When using electric wrenches, ensure the reaction torque support is securely positioned and the nut is properly tightened before starting.

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