Connecting sleeve (coupling) and drill rod
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1. The drill bit has a male (external) thread and is connected with the drill rod by means of a connecting sleeve;
2. The drill bit has a female (internal) thread and is directly connected with a drill rod with a male (external) thread. The latter is used more. The commonly used thread forms are: wave thread, anti-sawtooth thread and trapezoidal thread. The thread direction is left-handed (that is, the direction of rotation of the rock drill slewing mechanism is opposite). There are also drill bits that use cone connections. The connection is an interference fit. The cone of the drill rod is pressed into the cone hole of the drill bit, and the friction force of the contact surface is used to transmit the impact force and torque, so that the two will not loosen and slip off. The cone connection is easy to process, sturdy and durable, so this type of connection is widely used in small diameter drill bits. The parameters and accuracy of the cone connection have an important influence on the quality of the connection.
The smaller the cone angle, the better the connectivity, but the worse the disassembly. Our country's standard is: the drill bit diameter is less than or equal to 35mm adopts 4.8° cone angle, the diameter of 36~43mm adopts 7° cone angle, and the diameter of more than 45mm adopts 12° cone angle.
For a tool to be used normally, the connection between devices is very important. The link between them is like the communication and exchange between us. Only by combining appropriately can we create more value. Our mining accessories manufacturers sell all kinds of products, but also to ensure that customers can choose the equipment that suits them, and bring good benefits to customers.
Drill bit calculation formula: 1. Lengthening the drill rod will increase the probability that the drill rod will break during use. The material itself is inferior, and it depends on the chemical composition of the steel and the heat treatment system. The addition of drill 2. will reduce the hammer's striking strength. The breaking hammer uses hydraulic oil and air pressure to push the piston back and forth to hit the drill rod so that the energy is transferred to the tip of the drill rod through the drill rod and converted into impact force to achieve the crushing effect. The conversion rate of a too long drill rod will definitely decrease during the energy transmission process, resulting in insufficient hammer striking force and reduced work efficiency.
