The function of position detection equipment is to detect the displacement and speed of the moving parts of the automatic drilling machine, and send the reaction signal to form a closed-loop control system, and convert it into a digital signal sent back to CNC equipment and pulse instruction signal for comparison, in order to control the correct operation of the driving components. The precision and resolution of numerical control system depend on the accuracy of azimuth detection equipment. For different types of CNC machine tools, the precision requirements of the bit detection components, the detection system and the maximum moving speed of the measured parts are different.

At present, the highest level of detection components and systems is: when the highest moving speed of the tested component is 240m/min, the resolution of the detected displacement (the minimum amount of displacement that can be detected) can reach 1m, such as 0.1m when 24m/min. The highest resolution is 0.01pm. CNC drilling machine has the following requirements for position detection equipment.

1. The work is reliable, strong anti-interference because there are motor, solenoid valve and other electromagnetic induction components on the machine tool and the existence of lubricating oil and cutting fluid in the cutting process, therefore, the requirement of azimuth detection equipment in addition to the electromagnetic induction has a strong anti-interference ability, but also requires the equipment is not afraid of oil and water pollution. In addition, because of the generation of heat in the cutting process, it is also required that the position detection equipment has strong adaptability to the ambient temperature.

2. Meet the requirements of precision and speed

Under the condition of meeting the maximum displacement velocity of CNC drilling machine, the position detection equipment is required to reach certain detection accuracy and small cumulative error. With the development of CNC drilling machine, its precision and speed are higher and higher, therefore, it is necessary to satisfy the requirements of position detection equipment CNC drilling machine high precision and high speed.

3. Easy to install and protect

When the position detection equipment is installed, there must be certain device accuracy requirements, together with its device form and orientation, it is necessary to facilitate air protection.

4. Low cost, long life

Because of the impact of the operating environment, the position detection equipment is also required to have better dustproof, anti-oil mist, anti-chip and other characteristics.