A drill rod is a tool that connects the drill bit and is matched with rock drilling machinery to be used in rock or rocky soil for drilling by rock drills. Its dimensional accuracy and stability have an important impact on the performance and safety of the equipment. Therefore, the study of drill rod size has practical significance.

Size requirements

Length

The length of the drill rod should ensure stability of the connection and ease of operation. Generally speaking, the drill rod length should be within the requirements of the connecting equipment. Too long or too short may affect the performance of the equipment.

Diameter

The diameter of the drill rod directly affects its strength and stability. Too small a diameter may cause the rod to bend or break easily, while too large a diameter may increase the consumption of raw materials and the weight of the equipment. Therefore,  it is necessary to combine and consider the actual needs.

Material

The material of the drill rod has an important influence on its dimensional stability, corrosion resistance, and wear resistance. Choosing the appropriate material can ensure the dimensional accuracy of the drill rod and extend its service life.

Influencing factors

Environment

Environmental factors such as temperature, humidity, and corrosive media can affect the drill rod. For example, in a humid environment, the drill rod is prone to rust; in a high-temperature environment, the drill rod may expand and contract with heat, affecting accuracy.

Temperature

Temperature is an important factor affecting the size of the drill rod. High temperature will cause the drill rod to expand and reduce its dimensional accuracy; low temperature may cause it to shrink and affect its connection stability. Therefore, the effect of temperature on drill rods should be considered when designing them.

Working pressure

Changes in operating pressure may cause dimensional changes in the drill rod. Under high pressure, the drill rod may deform. While under low pressure, the drill rod may elastically recover, affecting its dimensional stability.

Measuring methods

Direct measurement

Direct measurement involves placing the drill rod in a measuring instrument and reading the dimensions directly. This measurement method is simple and intuitive, but the operation requires manual labor and may have some errors.

Indirect measurement

Indirect measurement is by measuring other parameters related to the size of the drill rod, such as weight, volume, etc., and then calculating the size of the drill rod based on these parameters. This measurement method is suitable for drill rods with complex shapes that cannot be directly measured, but there may be errors in the calculation process.

Digital measurement

Digital measurement uses computer technology and sensor technology to measure the drill rod. The data acquired by the sensors are input into the computer, and the software can process them to obtain accurate drill rod dimensions. Digital measurement methods have the advantages of high precision, high efficiency, and automation, but the equipment cost is high.

The importance of the size of the drill rod is self-evident. The accuracy and stability of its size are directly related to the performance and safety of the equipment. In practical applications, many factors may affect the drill rod size. Therefore, the design of drill rods should fully consider these factors and take appropriate measures to minimize their effects. At the same time, using appropriate measurement methods is also the key to ensuring the dimensional accuracy of the drill rod.