**Abstract**
This paper presents the application of the 8031 single-chip microcontroller in measuring the shaft angle of a stator car boring machine, introducing a new approach for high-precision digital display transformation. The system improves accuracy, reduces human error, and enhances operational efficiency in industrial settings.
**Keywords**: Digital display; Absolute angle measurement; Microcontroller application; Precision indexing
**Data Display Reconstruction for Axial Angle Measurement of Stator Turning and Boring Machine**
Liu Fang, Li Ping, Yang Guang
**Abstract**
In this study, the 8031 microcontroller is employed to achieve precise axis angle measurement for the stator turning and boring machine, offering a novel method for improving numerical display technology. This system not only increases measurement accuracy but also simplifies operation and reduces errors.
**Key Words**: Digital display reconstruction; Absolute angle measurement; Microcontroller application
**1. Introduction**
The stator car boring machine used by Harbin Electric Co., Ltd. is primarily designed for manufacturing turbo-generator stator frames. Traditionally, shaft angle measurements were conducted using optical reflection and projection methods, which are limited by low resolution and operator fatigue. These manual techniques often led to inaccuracies and inefficiencies. To address these issues, the SJF-01 digital precision indexing instrument was introduced. This device provides an intuitive and accurate way to measure and display angles, significantly improving the overall performance of the machine.
**2. Technical Performance and Specifications**
After the digital modification of the stator car boring machine’s shaft angle indexing system, operators can now simply press a switch to view the spindle rotation angle in digital form. The display shows values in degrees, minutes, seconds, and decimals, with two rows of displays that can be customized based on user preferences. The system offers a resolution of 2 arcseconds and a measurement accuracy of 2.5 arcseconds. It operates at speeds below 30 revolutions per minute and supports absolute zero setting. The power supply is AC 220V ± 5%, and the optimal operating temperature ranges from 0°C to 40°C.
**3. How Does the SJF-01 Digital Indexer Work?**
**3.1 Signal Acquisition**
The SJF-01 digital indexing instrument uses the JX130 absolute shaft angle encoder as its angular displacement sensor. The encoder is mounted coaxially on the indexing gear shaft and has 24 signal outputs. Since the signal amplitude is insufficient, it is amplified using a single-supply four-op-amp LM324. The amplified signal is then fed into a voltage comparator LM339 for further processing before being sent to the motherboard.
**3.2 Principle of Digital Display Instrument**
The SJF-01 utilizes the advanced 8031 single-chip microcontroller as its central processor. It is supported by various peripheral circuits such as address latches, program memory, decoders, A/D and D/A converters, buffers, and drivers. These components work together to perform accurate angle measurement and digital display. The hardware block diagram of the instrument is shown in Figure 1.
**Figure 1: Hardware schematic of precision indexer**
[Image description: Schematic diagram of the 8031-based digital indexing system.]
The 8031 microcontroller includes a CPU, RAM, timers, and I/O ports, making it highly versatile for control systems. It requires external program memory (EPROM2732) due to the absence of internal program storage. The chip features multiple I/O interfaces, enabling easy expansion and communication. The 8031 also includes timers and counters for precise timing operations. Additional peripheral components such as AD7574 for A/D conversion, LF398 for sampling, AD7502 for analog switching, and UA1489 for level conversion are integrated into the system to ensure accurate and reliable data processing.
**3.3 Software Structure**
The software of the SJF-01 is written in assembly language, ensuring fast execution and efficient memory usage. Mnemonics and label addresses are used to simplify programming, eliminating the need to memorize machine code or perform complex address calculations. The software block diagram is illustrated in Figure 2.
**Figure 2: Software block diagram of the precision indexer**
[Image description: Flowchart showing the main steps of the software process.]
**4. Conclusion**
After the modification, the stator car boring machine at Harbin Electric Co., Ltd. became significantly more efficient. Operators can now easily read the shaft angle on the digital display by pressing a switch, allowing for quick positioning of drill holes. The modified system completed a machine stand in 4–5 days, compared to the previous time frame, reducing labor costs and increasing productivity. The use of the 8031 microcontroller and dual absolute encoders ensures high accuracy and reliability, marking a successful step toward automated machine control.
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