Stability of the control system of the public normal line detector
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These kinds of measurement methods use mechanical manual operation, low efficiency, high error rate, not suitable for mass production, can not meet the requirements of industrialized large-scale production, and do not meet the current production practice in China, especially in Chongqing, as a Industrialized cities, automobile and motorcycle are the main pillar industries, and the contradiction between the production volume and detection of gears is particularly prominent. Therefore, the research of the gear common normal measuring instrument is also important in practice. The status quo at home and abroad has passed a large number of market surveys, the public normal line micrometer, the public normal line card table (card gauge) and the universal tooth measuring instrument. These kinds of measurement methods adopt mechanical manual operation, low efficiency, high error rate, simple operation and low price, but the measurement accuracy is low, and there are many gears that are not required for single-piece small-volume production or processing precision. The most typical are the common normal micrometers for absolute measurements; the common normal line gauges for relative measurements. In addition, there are various self-designed public normal line testing instruments. However, it is not suitable to use this kind of measurement method for the inter-process inspection in the production of large-volume gears. One of the reasons is that because the detection frequency is very high, and the same value is always measured, the control technology realizes the automation and digitization of the detection. It achieves the purpose of improving detection efficiency and detection accuracy, and can also meet the current production requirements. Through investigation, there is no such product at home and abroad, at least in the development stage.
Research purposes and content 1. Research purposes To solve the problem that the current large-volume gear production detection methods of automobile and motorcycle enterprises are single, the detection accuracy is not high, and the efficiency is low. The use of advanced testing methods can meet the needs of large-scale industrial production. Research content This design is to achieve automatic detection of the public normal line, that is, to achieve automation of gear clamping, transmission, measurement, and decomposition. The positioning, clamping, conveying and disassembly of the gear can be realized by using a hydraulic or pneumatic transmission device. The sensor is used to monitor the condition of the workpiece at various positions and control the next action. The control of the entire motion process is realized by the PLC control system. It is necessary to complete the control system schematic diagram, the control system component layout diagram, the control cabinet design diagram, the gear common normal line detector appearance diagram and some software design.
It is a structural study design description of this subject. The public normal line detector consists of three systems: mechanical system, control system and auxiliary system. The mechanical system includes a power source, a transmission mechanism, an actuator and a detection mechanism; and the PLC control system can simultaneously control a plurality of devices, and it is also convenient to change the control program and modify the control parameters. At the same time, the industrial computer is used to realize the friendly human-machine interface to realize the monitoring of the detection, the selection and modification of the workpiece parameters, and the recording of the detection results. Therefore, after comparison and analysis, the control scheme combining PLC and industrial computer is selected. The system structure diagram of the control scheme is shown in Figure 2. The whole system consists of the host computer, stepper motor driver, measurement system, and auxiliary. Industrial computer control system The functions of each part are introduced below: upper computer: The upper computer (industrial PC) reads and writes the motor control card through the control software, and can send commands such as position and acceleration to the control card.
The stepping motor driver generates a multi-beat pulse driving signal according to the received pulse signal to control the rotation of the stepping motor, and uses the differential variable pressure sensor to realize the automatic detection process of the gear common normal. The differential transformer type sensor is a sensor that converts the change of the measurement signal into a linear mutual inductance coefficient. The working principle is to convert the change of the measured displacement amount into the change of the mutual inductance M of the transformer coil by using electromagnetic induction.
The design system realizes the automatic detection of the gears and the automatic control of the whole process through the design, selection and development of the control system hardware and software. Through the design of the subject, the following conclusions are drawn: the design of the control system of the gear common normal line detector is completed, the automatic control of the whole detection process is realized, and the control strategy of using the computer as the upper computer and the single chip as the lower computer is realized. The PLC controls the operation of the stepper motor. The detection and operation process detection of the cylinder and the stepping motor by the control system is realized. The PLC system can communicate with the host computer using RS232. The PLC control system can realize the input and display of the program through the keyboard and the display, and can modify and clear the program, and has a good human-machine interface effect. Automatic storage of detected data is achieved. The stability of the control system of the public normal line detector is improved, and the reliability of the operation of the equipment is improved. Achieved the expected goals.
