Coal mine machinery PLC technology applied to special combined machine tool Feng Hongmei\Wang Shuangping\Qin Feng 2 (1. Henan Polytechnic University, Henan Jiaozuo 454000; 2. Jiaozuo Brake Co., Ltd., Henan Jiaozuo 454000) applied to the control of special combined machine tools, improved Equipment reliability and labor productivity reduce costs and increase economic efficiency.
The picture number: TP342; 1 Foreword The machine tool used to process the brake lever is controlled by a large number of relays. It has low reliability, easy to cause malfunction, fault is difficult to check, maintenance is frequent, noise is high and energy is consumed, and production cannot be satisfied more and more. need. At the same time, programmable logic controller (PLC) has been widely used in various fields of industrial control as a new type of industrial automation device. It has small size, low power consumption, long life, high reliability, flexible and universal, easy to program, repair and use. Convenient and other features. The PLC technology is applied to the special combination machine tool for brake lever machining, which enables the machine to realize all automatic cycle processes except for loading and unloading workpieces, avoiding the shortcomings caused by the large number of relays used in the past, improving and improving the control performance and improving the control performance. Production efficiency reduces production costs.
2 Basic principle The machine tool is a special machine tool using PLC control and hydraulic-mechanical transmission. It has a universal spindle box with 15 spindles, which can drill, expand and drill holes for 3 different specifications of the lever. 15 workpieces are machined simultaneously. The workbench adopts a six-station hydraulic rotary table with end-toothed disc positioning. Among them, five stations are drilled, expanded and drilled at the same time, and the remaining one station is the loading and unloading workpiece station. The clamping and loosening of the workpiece is achieved by a hydraulic system, and the clamping position of the workpiece is achieved by means of a specifically rotatable eccentric positioning pin. The control system is controlled by a programmable controller, which can realize the automatic cycle process except for loading and unloading the workpiece.
The input of the system as shown in the block diagram is mainly some switches and buttons, etc., which are input to the internal memory through the PLC external input terminal, processed by the PLC internal logic operation or other various operations, and then sent to the output terminal as the output of the PLC. Controls the execution of the solenoid valve and indicator light to achieve various parts of the device. The programmer of this system is hand-held, which is the peripheral device of PLC. It can input the programmed control program and read, check, modify and debug the user program through it. It can also monitor the working status and display error of PLC. Code or modify the setting parameters of the system registers, etc.
The system has 13 inputs and 9 outputs. Each input signal is transmitted to the PLC through each switch and button. After being processed by the CPU, it is output to each solenoid valve to complete the required sequence actions. In addition, each output branch is connected with an alarm fuse and an indicator light. Once an alarm is detected, it can be detected which output is faulty, which is convenient for maintenance.
The system operation flow chart is as shown.
The lC/control system is composed of input quantity-PLC-output quantity. This U1.u.tt Fig.2The coal mine machinery article number: 100-conveyor belt hinge connection application Zhang Guoping, Hu Changwei (Pingdingshan Coal Industry Group electromechanical equipment Co., Ltd., Henan Pingdingshan 467021) Introduction. Introduced here - an advantageous connection method - hinge connection in small coal mines, low power conveyor belts. It is fast, efficient, and requires no special tools.
Medium No.: TD528: A 1 Introduction Conveyor belt is not only the carrier of belt conveyor, but also the transmission part. It plays an important role in the belt conveyor. There are various connection methods, as shown in Table 1. In the general coal mine books, due to the high strength of the vulcanized joints, the application range is wide and there is a more detailed introduction; at the same time, the hook-and-pin connection and the stud connection are standardized because the joints are standardized and equipped with special tools, so there are detailed descriptions. Other connection methods are rarely or rarely introduced, for example, the hinge connection of the conveyor belt. Due to the short construction period of hinge connection, it has a wide range of applications in some small and medium-sized coal mines, and has been continuously improved and developed in practice, for example, Zhengzhou Coal Group Xindeng Coal Industry Co., Ltd., Yangcheng Group Mine and Second mine and so on.
Table 1 various conveyor belt connection conveyor belt connection method hook card connection buckle connection vulcanization connection hinge connection board card connection lap connection equipment operation can be divided into manual and automatic 2, in the manual state, through the button can achieve each The stepped equipment is operated in a single step for commissioning, adjustment and maintenance of the equipment.
When running the equipment, first start the oil pump motor and the spindle motor. After selecting the automatic operation mode, press the automatic cycle button to enter the automatic cycle processing. The loosening and clamping action of the workpiece requires manual button pressing. Once the workpiece is clamped, the device can automatically perform other actions in sequence. During the four movements of the turntable's lifting, indexing, dropping and resetting, a certain delay time is set to ensure that the mechanical action is fully in place.
In addition, the system also sets a loop pause, which is controlled by the inner coil 376 coil in the CPU, that is, when the system is in any state, press the cycle pause button, the 376 coil is immediately turned on, all the output points are disconnected, and there is no external Output, but does not affect the state of the internal coil, nor does it change the state of the output coil inside the CPU. In this way, in the event of a fault, the internal state of each coil (output and internal coil) can be checked on the premise of cutting off the output signal, making it easier to find the cause of the fault. This setting is used for system parking in an emergency.
3 Application results The special combined machine tool controlled by PLC greatly improves the production efficiency, shortens the processing time, improves the processing quality and precision, improves the reliability of the equipment and improves the economic benefit compared with the previous lever processing equipment. Reduce labor intensity and reduce production costs.
2L Small Internal Mixer,2L Rubber Mixer,2L Plastic Mixer,2L Silicone Mixer,2L Metal Powder Mixer
Dongguan Zhenggong Electromechanical Equipment Technology Co., Ltd , https://www.mixer-cn.com