Hexagon Bolt refers to the fastener composed of head and screw. According to the material, the bolt can be divided into iron bolt and stainless steel bolt, namely hexagon head bolt (partial thread) - C grade and hexagon head bolt (full thread) - C grade. Hex Bolt,Hex Bolts Cnc,Din933 Black Hex Bolts,Hex Bolts Head Screw With Dog Point Suzhou Gubao Screws Co.,Ltd. , https://www.gbscrewes.com
The topic starts with the analysis of the current status of the application of bar code tickets and magnetic tickets, combines the development trend of railway tickets, researches ticket ticketing technology, key equipment, application systems, technical specifications and business processes of RFID tickets, and proposes railway passenger tickets based on RFID technology. The complete technical solution of the system and the specification of the railway ticket solution and electronic ticket based on RFID technology. Through the research of this topic, not only has it achieved fruitful research results, it has overcome key technologies in many applications, and it also continuously introduces these research results and new technologies to decision-making and use departments for RFID technology in railway passenger transport. The large-scale promotion and application of the field is well-prepared for technical preparation.
The successful research and application of the project has played a very good demonstration effect in the railway industry. The research results have been applied in the Beijing-Tianjin High-Speed ​​Railway passenger ticket and the Guangzhou-Shenzhen Railway and other sections, which has laid an important role in promoting the large-scale application of RFID technology in the field of railway passenger transport. basis. At the same time, the huge circulation of railway tickets will inject vitality into the RFID industry chain and will drive upstream and downstream companies to become bigger and stronger RFID products. With the deepening of multiple ticketing systems in multi-voting system compatibility, massive data processing, system security management, automatic inspection, and other business areas, new technical requirements will be put forward for the technical innovation of railway passenger ticketing systems, thereby promoting China's railway informationization. Construction will reach a new level.
1. According to the stress mode of the connection, there are common and reamed holes. The bolts used for reaming holes should match the size of the holes and be used when subjected to transverse force
2. According to the head shape, there are hexagon head, round head, square head, countersunk head and so on. Generally, countersunk head is used in the place where the surface is smooth and no protrusion is required after connection, because countersunk head can be screwed into parts. Round head can also be screwed into parts. The tightening force of square head can be larger, but the size is large. Hexagon head is the most commonly used.
In addition, in order to meet the needs of locking after installation, there are holes in the head and in the rod, which can prevent the bolts from loosening when they are subject to vibration.
Some bolts have no thread of smooth rod to do thin, called thin waist bolt. This kind of bolt is conducive to variable force connection.
There are special high strength bolts on the steel structure. The head will be bigger. The size will also change.
In addition, there are special uses: T-shaped slot bolts, most of which are used in machine tool fixtures, with special shape, and both sides of the head need to be cut off. Anchor bolts are used to connect the machine and the ground, and there are many shapes, such as U-shaped bolts, and so on.
There are also special studs for welding, one with thread and the other without thread, which can be welded on the parts, and the other side can directly screw the nut.
RFID technology: railway ticket application passed acceptance [full text]
In order to improve the security capacity of railway tickets, avoid false tickets to the maximum extent, reduce the complexity and cost of automatic ticketing equipment, increase the level of automation, and facilitate business expansion to suit the needs of different businesses. The National 863 Program "Radio Frequency Identification (RFID) "Technology and Application" Major Project Issues The application research of RFID technology in the field of railway ticketing was carried out. Recently, this topic passed the acceptance.