Practical Application of Numerical Control System in Toothbrush Tufting Machine1

High-speed positioning with an error of less than 0.005mm 1,000 times per minute, fully independent action mechanism with consistent and coordinated action, efficient and intelligent equipment, and the successful application of the general CNC control system on the toothbrush tufting machine are regarded as pride by the industry.

1. Toothbrush hair planting machines are roughly divided into 3 types:

The first is a low-speed intelligent tufting machine driven by a stepping motor developed by a single-chip microcomputer system (high degree of intelligence, but the speed is low and the maximum is 240 holes/min),

The second type is a high-speed cam tufting machine, but the replacement of varieties must follow the pre-designed track to make three types of cam discs and color changing discs (the processing cycle is long, the process is complicated, and only fixed varieties and colors can be used).

The third model is a dedicated intelligent high-speed tufting machine system developed by Germany or Taiwan (strong specificity, expensive equipment and spare parts).

2. Key issues in system design

General CNC system configuration determination Due to our company's research and development of high-speed cam machinery, familiarity with equipment and action principles combined with the company's own automation control technology level, we confirmed that the use of general CNC systems with high-performance servo drive equipment can achieve The control requirements of the intelligent high-speed tufting machine, coupled with the stability, reliability and anti-interference of the general-purpose numerical control system, can fully meet the process requirements.

Before the configuration is determined, we have listed in detail the technical requirements of the high-speed tufting machine for the system:

(1) High-speed and high-precision positioning requirements of 1000 times in 1.5 minutes for 2 axes, each positioning action including acceleration and deceleration time shall not exceed 48MS; positioning accuracy error shall be less than 0.005MM;

(2) Judgment of up to 4 kinds of output signals during the positioning action without delay output

(3) Logical fast stop, when the main shaft frequency conversion motor fails, the stop from 1000RPM does not exceed 2 revolutions at most, which is twice as fast as the mechanical brake speed

(4) Rapid response of the detection element (>5000HZ)

(5) System reliability, stability and operational versatility

The best combination of the stability and reliability of the general CNC system and the high-speed response servo drive equipment is applied to the toothbrush hair planting machine, which increases the production speed of the original single-chip microcomputer by nearly 3 times, and fully improves the production efficiency. The consistency and integration of the supporting system will make the advantages of the system gradually manifest.

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