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Tools (48445)

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The so-called hand tools, also called hand tools, are relative to electric tools. It is mainly by hand to twist or apply force to the tool.
Hand tools can be divided into wrenches, pliers, screwdrivers, tape measures, hammers, sockets, cutting tools, scissors, sets, and auxiliary tools such as tool carts. Each type is different. Model.
Wrenches include open-end wrenches (machine-handed), double torx wrenches, ratchet wrenches (quick wrenches), combination wrenches (composite wrenches), tubing wrenches, T-type socket wrenches, cross socket wrenches, adjustable wrenches, etc.;
Pliers include wire cutters, needle-nose pliers, diagonal pliers, retaining ring pliers, slip joint pliers, water pump pliers, pipe pliers, power pliers and other categories;
The screwdriver has a word, cross, Pozi, hexagon, pattern and other categories;
The sleeves are divided into ordinary sleeves, flower sleeves (E-type sleeves), screwdriver sleeves (BIT sleeves), spark plug sleeves, powerful sleeves and so on. According to the common specifications, there are three kinds of specifications: 1/4", 3/8" and 1/2", "is expressed in inches; at the same time, each specification is divided into 6-point socket and 12-point socket;
Hammers are divided into claw hammer, fitter's hammer, round head hammer, rubber hammer and installation hammer;
Cutting categories include files, diamond files, tin snips, aviation scissors, utility knives, square pipe saws, pipe cutters, bolt cutters, etc.;
In terms of materials, there are Luo vanadium steel, carbon steel, alloy steel and so on.
A tool used to turn a screw to force it into place. It usually has a thin wedge-shaped head that can be inserted into a slot or recess in the screw head-also known as a "screwdriver".
Use the principle of leverage to turn bolts, screws, nuts, and other threaded hand tools that hold the openings of bolts or nuts or sets of holes. Wrenches are usually made with clamps on one or both ends of the handle to apply external force to the handle to apply external force to turn the bolt or nut to hold the opening or sleeve of the bolt or nut. When in use, an external force is applied to the shank along the direction of thread rotation, and the bolt or nut can be turned.
It is a tool to knock an object to move or deform it. It is most commonly used to knock nails, correct or break objects. Hammers come in various forms, the common form is a handle and top. One side of the top is flat for striking, and the other side is a hammer head. The shape of the hammer head can be like a horn or a wedge, and its function is to pull out a nail. There is also a round head-shaped hammer head.
Test pencil:
It is also called "electric pen" for short. It is an electrician's tool used to test whether there is electricity in the wire. There is a neon bulb in the pen body. If the neon bulb glows during the test, it indicates that the wire has electricity, or it is a live wire of the passage. The tip and tail of the test pencil are made of metal materials, and the barrel is made of insulating materials. When using the test pen, be sure to touch the metal part of the end of the test pen with your hand, otherwise, because the charged body, the test pen, the human body and the earth do not form a loop, the neon bubble in the test pen will not emit light, causing a misjudgment, and it is considered a charged body Uncharged.
tape measure:
Tape measure is a commonly used tool in daily life. What you often see is the steel tape measure, which is commonly used in construction and decoration, and is also one of the essential tools for the family. Divided into fiber tape measure, tape measure, waist measurement and so on. Luban ruler, Feng Shui ruler, and Wen Gong ruler are also steel tape measures.
Wallpaper knife
A kind of knife with a sharp blade, used to cut wallpapers and the like, hence the name "wallpaper knife", also known as "art knife". It is often used in the decoration, decoration, and advertising plaque industries. [2]
Electrician's knife:
Electrician's knife is a cutting tool commonly used by electricians. An ordinary electrician's knife is composed of a blade, a knife edge, a knife handle, and a knife hanger. When not in use, retract the blade into the handle. The root of the blade is hinged with the handle, with scale lines and scale marks on it, a screwdriver bit is formed on the front end, and a file surface area is machined on both sides. The blade has a concave curved blade, and the end of the blade forms a blade tip. The handle is provided with a protection button to prevent the blade from rebounding. The blade of the electrician's knife has multiple functions. It only needs one electrician's knife to complete the operations of connecting the wires. There is no need to carry other tools. It has the beneficial effects of simple structure, convenient use, and diverse functions.
Including hand saws (household, woodworking), cutting saws (branches trimming), folding saws (branches trimming), hand bow saws, edge saws (woodworking), slitting saws (woodworking), cross-cut saws (woodworking)
Spirit level:
The spirit level has a horizontal bubble, which can be used to inspect, measure, and debug whether the equipment is installed level.
Wire cutters:
Wire cutters are a kind of clamp and cutting tool, which are composed of a clamp head and a clamp handle. The clamp head includes a jaw, a tooth, a knife, and a guillotine. The role of each part of the pliers is:
①The tooth opening can be used to tighten or loosen the nut;
②The knife edge can be used to cut the rubber or plastic insulation layer of soft electric wires, and it can also be used to cut electric wires and iron wires;
③The guillotine can be used to cut hard metal wires such as electric wires and steel wires;
④The insulated plastic tube of the pliers can withstand voltage above 500V. With it, you can cut wires with electricity. [2]
Needle nose pliers:

Also called trimming pliers, it is mainly used to cut single and multi-strand wires with thinner wire diameters, as well as for bending single-strand needle-nose pliers wire joints, stripping plastic insulation, etc. It is also an electrician (especially an internal electrician) One of the commonly used tools. It is composed of a pointed tip, a knife edge and a pliers handle. Electrician's needle-nose pliers are covered with insulating sleeves with a rated voltage of 500V. Needle-nose pliers have sharp heads and are used in small spaces. The operation method of using needle-nose pliers to bend the wire connector is: first fold the wire head to the left, and then bend the screw to the right in a clockwise direction.

Wire stripper
The wire stripper is one of the tools commonly used by inside electricians, motor repairs, and instrument electricians. It is composed of a knife edge, a crimping mouth and a clamp handle. The clamp handle of the wire stripper is covered with an insulating sleeve with a rated working voltage of 500V. Wire strippers are suitable for stripping plastic and rubber insulated wires and cable core wires. The method of use is: put the thread to be stripped into the cutting edge of the pliers, pinch the two pliers handles with your hands, and then loosen it, the insulation will be separated from the core wire.
Operating tools:
Seiko hand tools
1. Use appropriate saw blades for work, such as 14 teeth per inch for cutting hard or thick soft metals; 18 teeth per inch for tool steel, iron pipes, hard metals, etc.; and 24 teeth per inch for metal plates , Sawing of metal pipes and thin iron bars.
2. Push the saw forward and lift it gently when pulling it back.
1. The wrench of appropriate size should be selected according to the nature of the work.
2. When using the adjustable wrench, force should be applied to the fixed side, never force to the movable side.
3. If the wrench opening is worn or slipping during use, it should not be used anymore to avoid slipping.
4. Do not use a wrench as an iron to strike. 5. Do not put a pipe on the handle end of the wrench to increase the torque of the wrench.
Long square
Long square: Press the inside of the first side of the square, leaning against the edge of the board, and draw a pencil along the inside of the second side of the square to draw a vertical line.
1. Choose an appropriate screwdriver according to the size and shape of the screw head groove.
2. The handle of the screwdriver should not be knocked with a hammer. If the handle is damaged, it should be replaced immediately.
3. Do not use the screwdriver as a chisel or lever.
4. An electric screwdriver should be used to check the current, and a general screwdriver cannot be used to check high-voltage electricity.
5. The blade of the screwdriver cannot be ground to avoid damage to the hardened surface.
6. The screwdriver should not be put in the pocket of clothes or trousers to avoid injury in collision or fall.
C clip
The C-type clamp is used to fix the work object. When clamping the object, the shaft and rocker face down. Generally, a 3-inch clamp or a 4-inch clamp {refers to the maximum thickness that can be clamped} is enough, and the number of clamps is large.
1. The pliers are only used to fasten, insert and remove all kinds of pins and nails, and to cut or tighten all kinds of wires.
2. Pliers cannot be used to tighten or knock bolts or nuts.
3. The handle of the pliers cannot be beaten or lengthened to increase the clamping or cutting power.
Woodworking knife
Woodworking knives are generally used to trim irregular parts of the details. The blade is a whole piece and is less likely to break.

How to buy
Attention should be paid to the purchase of power tools: First, the power tool is a hand-held or removable mechanized tool that is powered by a motor or an electromagnet and drives the working head through a transmission mechanism. Electric tools are easy to carry, easy to operate, and versatile, which can greatly reduce labor intensity, improve work efficiency, and realize manual operation mechanization. Therefore, they are widely used in construction, housing decoration, automobiles, machinery, electricity, bridges, gardening and other fields. , And enter the family in large numbers.
Electric tools are characterized by light structure, small size, light weight, low vibration, low noise, flexible operation, easy control and operation, easy to carry and use, strong and durable. Compared with manual tools, it can increase labor productivity by several to tens of times; it is more efficient than pneumatic tools, has low cost and is easy to control.
Purchase items:
1. Distinguish between home use and professional use according to needs. Most electric tools are designed for professionals. When purchasing, you should distinguish between professional and general household tools. Generally, the difference between professional and general household tools is in power. The power of professional tools is larger to facilitate professionals to reduce the workload. The general household tools are relatively small due to the smaller engineering and relatively small workload, so the input of the tool The power does not need to be large.
2. The outer packaging of the tool should be clearly patterned and not damaged. The plastic box should be firm. The buckle for opening the plastic box should be firm and durable.
3. The appearance of the tool should be uniform in color, and the surface of the plastic parts should have no obvious shadows and dents, no scratches or bumps, and the assembly misalignment between the shell parts ≤0.5mm, the aluminum casting coating should be smooth and beautiful without defects, the whole machine The surface should be free of oil and stains. When holding by hand, the handle of the switch should be flat. The length of the cable should generally not be less than 2 meters.
4. The nameplate parameters of the tool should be consistent with those on the CCC certificate. The manual should have the detailed address and contact information of the manufacturer and the manufacturer. There should be a traceable batch number on the nameplate or certificate.
5. Hold the tool by hand, turn on the power, operate the switch frequently to start the tool frequently, and observe whether the on-off function of the tool switch is reliable. At the same time, observe whether there are any abnormalities in the TV and fluorescent lamps on site. In order to confirm whether the tool is equipped with an effective radio interference suppressor.
6. The tool is energized and run for one minute. Hold it with your hand during operation. You should not notice any abnormal vibration in your hand. Observe the reversing spark. The reversing spark should not exceed level 3/2, generally from the air inlet of the tool. Looking inside, there should be no obvious arc on the surface of the commutator. During operation, there should be no abnormal noise.
Drilling tools that use electricity as power. It is a conventional product in power tools and the most in demand power tool product. The annual production and sales volume accounts for 35% of China's power tools. According to reports, in the next ten to fifteen years, the world's sales of electric tools will increase at an annual rate of 5%. Power tools are a kind of "low-value consumables". In Europe and America, power tools are not only used as a tool, but also as a gift, becoming a gift for each other, so there is a great market development potential.
Choose and use
The hand-held power tools used by electricians are used in harsh environments, and they must be constantly moved, vibrated, and noisy during use. The power cord is easily damaged by external forces such as dragging, friction or mechanical extrusion, which will damage the insulation strength and cause personal injury or death due to electric shock. To prevent accidents, hand-held power tools should be selected correctly.
Method of choosing
1. Select qualified products with "3C" certification.
   2. In general occasions, Class II products should be used. This type of equipment has double insulation and is relatively safe to use.
  3. When working in a humid place or a place with good electrical conductivity, such as a metal frame, you should use Type Ⅱ or Type Ⅲ products.
   4. When working in narrow places such as metal containers, pipes, boilers, etc., class III products should be used.
   5. If it is necessary to use Class I products, other necessary safety measures should be taken in accordance with safety requirements, such as installation of leakage protectors, safety isolation transformers, etc.
1. Check it carefully before use, the appearance is not damaged, the switch action is flexible and no jamming, the power lead and the shell of the power tool should be intact. Use a 500V megohmmeter to measure the insulation resistance between the winding and the housing and the value shall not be less than 0.5 megohm. See the attached table for the insulation resistance value.
2. Hand-held power tools with metal shells should have reliable protective grounding wires. The power lead is a multi-core soft rubber sheathed cable, and both ends of the grounding protection wire should be firmly connected.
3. Hand-held power tools should be used by full-time personnel with certain professional knowledge. Strictly abide by relevant safety operating procedures during use.
4. Before use, you must check whether the relevant electrical protection devices and mechanical protection devices are in good condition. Its use should be normal.
Also pay attention to whether the rotating part rotates flexibly without jamming.
5. When using Class I hand-held electric tools, the user must wear protective equipment that meets the regulations and set up qualified protective equipment. And take corresponding safety protection measures against electric shock according to regulations, such as installing a leakage protector in the power circuit, or wearing insulating gloves, wearing insulating shoes, or standing on an insulating mat.
When using Class II hand-held electric tools in a humid and narrow place, a leakage switch should be installed. The working current of the electric switch is less than 1.5mA, and the action time is less than or equal to 0.1 second. And the leakage switch should be placed in the container and supervised by a dedicated person.
6. Occupational hazards of using hand-held power tools. Arm vibration disease caused by long-term hand-transmitted vibration operations was listed as one of the statutory occupational diseases in my country as early as 1957, also known as local vibration disease, and typically manifested as paroxysmal white fingers.
Hand-held electric tools, especially those with unbalanced mass rotating parts, such as tools with crank connecting rod piston impact devices and tools with eccentric devices (such as electric hammers, electric picks, etc.), will produce Larger vibrations. When operating these tools, vibrations are transmitted to the hands, wrists and shoulders of the operator. With the widespread application of electric tools, the vibration hazards generated by them have attracted more and more attention.
Common measures for occupational disease prevention include: carefully maintain and maintain tools in accordance with the instructions of the manufacturer; when different tools can be rotated, use operating methods that produce lower vibration as much as possible; prevent the tools from being in the hands of the operator. Cold gases and liquids are generated around the environment; if possible, in cold conditions, the operating handle of the tool should be heated; should avoid using tools whose shape of the handle in the contact area generates high pressure on the skin; when it is available, you should choose Tools that require minimum contact pressure (holding force and feed force); use vibration-damping gloves; wear gloves during operation to avoid hearing damage.

Due to the different input currents, motors can be divided into DC motors and AC motors:
   (1) DC motor-a motor that uses DC current to rotate is called a DC motor. Because of the different ways of connecting the magnetic field circuit and the armature circuit, they can be divided into series motors, split motors, and double-excited motors;
(2) AC motor-induction motor in AC motor, its strong induced current (eddy current) is generated in the rotating magnetic field. The copper rod on the rotor cuts the magnetic field lines continuously. According to Lenz's law, this induced current has an anti-magnetic field. The effect of relative movement with the rotor, so the rotor rotates with the magnetic field. However, the rotating speed of the rotor is not as high as that of the magnetic field transformation, otherwise the magnetic lines of force will not be cut by the copper rod.
A motor that uses alternating current to rotate is called an alternating current motor. There are many types, mainly:
a. Rectifier motor-the series-excited DC generator is used as an AC motor to form this kind of motor. Because the alternating current is in the magnetic field and the armature circuit and turns at the same time, the direction of the moment of the couple remains unchanged. The machine is Spinning non-stop. This kind of motor is also called "universal motor" because it can use both AC and DC. Vacuum cleaners, sewing machines and other household appliances often use this type of motor.

  B. Induction motor-a device that puts the rotor in a rotating magnetic field and rotates the rotor due to the action of eddy currents. The rotating magnetic field is not created by mechanical methods. Instead, alternating current is passed through several pairs of electromagnets to make their magnetic pole properties cyclically change, which can be regarded as a rotating magnetic field. Usually three-phase induction motors (with three pairs of magnetic poles) are used. The movement of a DC motor is just the opposite of that of a DC generator. In the generator, the induced current is formed by the induced electromotive force, so they are in the same direction. In the motor, the current is the direction of the induced electromotive force supplied by the external power source and the direction of the armature current I is opposite.

  C. Synchronous motor-a motor whose armature rotates from one pole to the next pole, exactly in the same cycle as the direction of the current. This kind of motor cannot be started by itself, and another motor or special auxiliary winding must be used to make it reach the appropriate frequency before it can be connected to the alternating current. If the load changes and the speed changes, the speed will not match the frequency of the alternating current, which is enough to make the pace disorder, tend to stop or cause damage. Due to many restrictions, it is not widely used.


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