Pneumatic marking needle and use method

Abstract

The invention provides a pneumatic marking needle and a use method. The pneumatic marking needle comprises a cavity, wherein the top of the cavity is provided with an air inlet hole and a sealing ring, a printing needle is arranged in the cavity, a spring sleeves a needle bar, a needle seat limiting groove and a spring limiting groove are formed in the bottom of the cavity, the diameter of the sealing ring is smaller than the diameter of a needle seat, the cavity comprises a sealed stroke cavity and a non-sealed stroke cavity, the needle seat is in clearance fit with the sealed stroke cavity,the diameter of the non-sealed stroke cavity is larger than the diameter of the needle seat, and an exhaust hole is formed in the bottom of the cavity. According to the marking needle, by increasing the acting distance of compressed air on the needle seat, the initial kinetic energy of the printing needle is increased, the utilization rate of air compression energy is increased, the impact strength of the printing needle is greatly improved, the compression potential energy of the spring is increased, and the striking frequency is improved.

Description

technical field [0001] The present application relates to the technical field of pneumatic marking, in particular to a pneumatic marking needle and its use method. Background technique [0002] Pneumatic marking needles are the marking devices currently equipped on pneumatic marking machines. In principle, pneumatic marking needles drive marking needles to compress springs through compressed air to achieve high-frequency vibration to complete marking, and the main sealing method is through needles. It is realized by the cooperation of the seat and the sealing ring. [0003] In the prior art, the compressed air is sealed by the sealing ring in the needle seat and the needle cavity. After the compressed air is conducted, once the needle seat is pushed away from the sealing ring, the compressed air passes through the large gap between the needle seat and the needle cavity. It is connected to the atmosphere and loses the driving force. This structure makes the time and stroke o...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the compressed air is sealed by the sealing ring in the needle seat and the needle cavity. After the compressed air is conducted, once the needle seat is pushed away from the sealing ring, the compressed air passes through the large gap between the needle seat and the needle cavity. It is connected to the atmosphere and loses the driving force. This structure makes the time and stroke of the driving force of the compressed air acting on the needle seat very short, the printing needle cannot be fully charged, the utilization rate of the gas compression energy is low, and the impact force is small. ; Similarly, there is not enough strength to compress the spring to provide enough kinetic energy for the return needle, and the printing frequency is naturally not high, resulting in small impact force of the marking needle, low frequency, and shallow marking depth, which often cannot meet the marking requirements

Even in the cold northern region, due to the reduction of the elasticity of the sealing ring, there is a gap between the needle seat and the sealing ring, which cannot be sealed, resulting in the situation that it cannot vibrate

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