German DAINU tools DAINU models DAINU prices

DAINU tools are made of copper alloy. Due to copper's good thermal conductivity and its characteristic of being almost carbon-free, the heat generated in a short time when the tool rubs against or impacts an object is absorbed and conducted. Another reason is that copper itself is relatively soft, providing good compliance during friction and impact, making it difficult to produce tiny metal particles. As a result, we hardly see any sparks, so explosion-proof tools are also called non-sparking tools. The materials for explosion-proof tools are beryllium bronze and aluminum bronze. Beryllium bronze alloys and aluminum bronze alloys do not spark upon impact or friction, making them very suitable for manufacturing safety tools used in explosive, flammable, strong magnetic, and corrosive environments. BeA-20C alloy withstands an impact energy of 561IJ in hydrogen containing 30% or in methane-air-oxygen mixtures containing 6.5-10%, undergoing 20 impacts without sparking or ignition.

DAINU tool principles

The principle of hydraulics consists of two hydraulic cylinders of different sizes, filled with water or oil. Water-filled ones are called 'water presses'; oil-filled ones are called 'oil presses'. Each hydraulic cylinder contains a sliding piston. If a certain 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 by the liquid in all directions. 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 to the small piston results in a larger force on the large piston. Therefore, hydraulic presses are used for pressing plywood, extracting oil, lifting heavy objects, forging steel, etc.

DAINU tool parameters

The main performance parameters characterizing the basic working capability of lifting tools are lifting capacity and work class. (1) Lifting capacity refers to the maximum weight of the load allowed to be lifted under specified working conditions, i.e., the rated lifting capacity. Generally equipped with a permanent magnet chuck (see permanent magnet lifter), its lifting capacity should also include the weight of the permanent magnet chuck. (2) Work class is a performance parameter reflecting the overall working status of the lifting tool and is an important basis for designing and selecting lifting tools. It is determined by the total number of work cycles required to be completed during the required service period and the load state. For lifting tools with strong regularity and high repeatability in operation procedures, such as electric hoists for loading and unloading ship cargo at docks, chain hoists for high-bay warehouses, and hopper lifts for supplying blast furnaces, the work cycle is also an important parameter. The work cycle refers to the time required to complete one work cycle, which depends on the operating speed of the mechanism and is related to the handling distance. The aforementioned lifting tools sometimes also use productivity as an important parameter, usually expressed in terms of the lifting volume completed per hour. In current use, efficiency is the priority, followed by appearance and quality.

DAINU tool operation

1) For mobile electric machinery and handheld electric tools, single-phase power cords must use three-core flexible rubber cables, and three-phase power cords must use four-core rubber cables; during wiring, the cable sheath must be inserted into the equipment's junction box and secured. 2) Before using electric tools, inspect the following items: no cracks or damage to the housing or handle; correct and secure connection of the protective grounding wire or neutral wire; intact cables or flexible cords; intact plugs; normal, flexible, and undamaged switch operation; intact electrical protection devices; intact mechanical guards; and flexible rotating parts. 3) The insulation resistance of electric tools should be measured regularly using a megohmmeter with 500V; if the insulation resistance between live parts and the housing is less than 2M Ω, maintenance must be performed. 4) After repairing the electrical components of electric tools, insulation resistance measurement and dielectric withstand voltage tests must be conducted; the test voltage is 380V, and the test duration is 1 minutes. 5) Electrical circuits connecting electric machinery and tools must have individual switches or sockets and be equipped with residual current operated protective devices; metal housings must be grounded; it is strictly prohibited to connect multiple devices to a single switch. 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 motor-driven tools should be positioned within easy reach of the operator. During breaks, after work, or in case of sudden power outage during operation, the power supply switch must be disconnected. 8) When using portable or mobile electric tools, wear insulating gloves or stand on an insulating mat; when moving tools, do not lift them by the cord or the rotating parts. 9) When using Class III insulated electric tools in damp or acid-containing environments, or inside metal containers, reliable insulation measures must be taken and a dedicated supervisor must be assigned. The tool's 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 firmly seated and the nut is securely tightened before starting.

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