Pipe clamp is what we know better, and it is often used in life. It is used to grip and rotate steel pipe workpieces. It can be divided into many kinds according to the carrying capacity, weight and style, and is widely used in the installation of oil pipelines and civil pipelines. It is also known as the clamp, pipe clamp, pipe installation and repair work is often used in the tool. Then when buying pipe pliers, we should understand some necessary knowledge to facilitate the purchase of appropriate pipe pliers. The following Xiaobian take you to understand the characteristics of the pipe clamp.
The structure of the pipe clamp is composed of an active clamp mouth, a clamp handle body, a adjusting nut, a piece spring, a fixed clamp mouth, etc. Its type can be divided into American, British, heavy three, specifications are: 200mm, 250mm, 300mm, 350mm, 450mm, 600mm, 900mm and so on.
1, strength test: pipe clamp according to the standard requirements of strength test, can withstand the relevant provisions of the test torque.
2, surface quality inspection: pipe clamp can not have lines, burrs, the surface should not have obvious oxidation skin, sand holes, pores and other defects. The surface roughness Ra value of the machined surface on both sides of the jaws should not be greater than 3.2μm, and the machined surface roughness Ra value of the remaining parts should not be greater than 12.5μm. The surface coating of the handle body should be uniform and uniform in color, without obvious flow marks, delamination and other defects.
3, hardness test: the hardness of each part of the pipe clamp after heat treatment, the hardness of the clamp teeth ≥47HRC, the hardness of the clamp thread and the adjusting nut ≥30HRC, the spring hardness should be ≥71HRA.