Wrench related knowledge
Wrenches are basically divided into two types, dead wrenches and live wrenches
The former refers to the fixed number has been written on the wrench, the latter is the wrench.
1. wrench: one or both ends of the fixed size of the opening, used to twist a certain size of the nut or bolt.
2. Plum wrenches: both ends with a hexagonal hole or twelve hole hole of the working end, suitable for small work space, can not use ordinary wrench occasions.
3. Dual wrench: one end with the same single wrench, the other end with the same wrench, both ends twist the same specifications of the bolt or nut.
4. Wrench: The width of the opening can be adjusted within a certain size range, can be screwed to different specifications of the bolt or nut. The structure of the wrench is characterized by a fixed jaw made with a flat tooth clamp Concave; movable jaw made at one end of the flat jaw; the other end made with a fine teeth of the concave jaw; down the worm, the activities of the jaws can be quickly removed, change the jaw position.
5. Hook wrench: also known as crescent-shaped wrench, used to twist the thickness of the restricted flat nuts and so on.
6. Socket wrench: it is composed of a number of hexagonal holes or twelve holes in the sleeve and with a handle, connecting rod and other accessories, especially for the twist position is very small or very deep depression Bolts or nuts.
7. Allen wrench: into the L-shaped hexagonal rod wrench, dedicated to twist the hexagon socket screws. Hexagon wrench model is in accordance with the hexagonal side of the size of the bolt, the size of the country standard. Uses: designed for fastening or dismantling machine tools, vehicles, machinery and equipment on the use of round nut.
8. Torque wrench: it can be used to twist the bolt or nut to show the applied torque; or when the applied torque reaches the specified value, it will emit light or sound signal. Torque wrench apply It is expressly prescribed in terms of torque size. The use of open wrench and technical characteristics Screw is the main fastener in mechanical equipment, open wrench is the machinery industry processing, production and maintenance of an important tool, the project is a traditional wrench tool revolution, it has the following
Several advantages.
1. Can work quickly, working faster than traditional wrenches three to four times faster than the speed of the fast wrench.
2. An open-end wrench can be used for 2-6 kinds of screws, and a double-headed wrench only applies 2 kinds of screws. An open-end wrench is equivalent to 2-3 wrenches, which is equivalent to an active wrench but can be quickly operated without adjustment of the opening.
3. Long life, bad, and the former fast wrench bad.
4. The manufacturing process is simple and cost less than the wrench.
5. Light weight, easy to carry, work effort.
Detection requires editing
1. There must be rust, burrs, cracks and spots;
2. Wipes symmetrical, laser lettering to be clear;
3. Hardness to meet the required standards, and the card bit to be accurate
4. The wrench of the active wrench is flexible and the pin can not be loosened
