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Basic introduction: Bolt: a kind of fastener composed of the head and the screw (the cylinder with the external thread), which needs to cooperate with the nut to tighten the two parts with open holes. Because Plastic Bolt is also a kind of railway accessories, railway accessories are part of railway lines, the track referred to here include rail, sleeper, link parts, bed, anti-climbing equipment, rail support and turnout, etc.As an integral engineering structure, the track is laid on the subgrade, which plays the guiding role of the train operation, and directly bears the huge pressure of the rolling stock and their load. Under the power action of the train operation, its various components must have sufficient strength and stability to ensure that the train is running safely, smoothly and uninterrupted according to the prescribed maximum speed.
Main classification: according to the connection of connection: ordinary and hinged holes. Ordinary main bearing axial force, can also carry the less demanding lateral force. The bolts used for hinge holes should be matched with the size of the hole when subjected to lateral force. According to the shape of the head: have hexagonal head, round head, square head, heavy head and so on. Of these, the hexagonal heads are the most commonly used. The sink is generally used where the surface is smooth after the connection, because the sink can be screwed into the part. Round heads can also be screwed into the parts. The tightening force can be larger, but the size is very large. In addition, in order to meet the needs of locking after installation, there are holes in the head, the rod part has holes, these holes can make the bolt by vibration without being loose. Bolts without the thread of the light rod to do thin, called a thin waist bolt. This bolt is the to the variable forces. The steel structure has dedicated high strength bolts, the head will be bigger, the size will change. In addition, there are special uses of: T-shaped groove bolts, the machine tool fixture used on the most used, special shape, the two sides of the head to cut off. The anchor bolts, used for machine and ground connections, come in many shapes. The U-shaped bolts, as described above. There are special studs, a thread one end, can be welded on the parts, the other side directly twist the nut.
Horse riding bolt: horse riding bolt English name is U-bolt, non-standard, shape is U shape so also called U-shaped bolt, both ends have thread can be combined with the cap, mainly used for fixed pipe such as water pipe or sheet such as car plate spring, because its fixed objects like people riding on a horse, it is called horse riding bolt.
Performance grade: The bolts for steel structure connections are 3.6,4.6,4.6,4.8,5.6,6.8,8.8,9.8,9.9.8,10.9,12.9. The 8.8 or above bolts are made of low carbon alloy steel or medium carbon steel and heat treatment (quenching, tempering), generally called high strength bolts and the rest are ordinary bolts. The bolt performance grade mark consists of two parts of numbers, respectively representing the nominal tensile strength value and the flexion strength ratio of the bolt material.
For example: performance level 4.6 level of bolts, its meaning is: 1, bolt material nominal tensile strength of 400MPa level; 2, the yield strength ratio of bolt material is 0.6; 3, bolt material nominal yield strength of 400×0.6=240MPa level. Performance grade 10.9 high strength bolt, its material after heat treatment, can reach: 1, bolt material nominal tensile strength of 1000MPa; 2, bolt material yield ratio is 0.9; 3, the nominal yield strength of bolt material of 1000×0.9=900MPa.
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August 02, 2022
August 02, 2022
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