This paper introduces the application of PLC in control system of drilling machine with multi-head.The construction,function and control conditions of the machine are analyzed,the hardware and software design of the control system are also expounded.Put forward the distribution table,and programming the automation control program.The results shows that efficiency are effective improved and the equipment maintenance workload are reduced.
The passage is on the basis of introducing the PLC communication function CP1H,by a actual case which introducing the use of PC Link communication way.The practice of this project is of value which referred to.
Machining tool crawling problem is one of important research topic to improve the accuracy of CNC machine.The principle of creeping of CNC machine tools is analyzed based on reasons of the crawling phenomenon and the mathematical model of crawling is established.The effective measure of solving crawling problem is proposed based on the analysis of the reasons of CNC machine tools.How to change the parameters to improve the crawling phenomenon of the CNC machine tools is elaborated,the popular Siemens 802D CNC system in the market is used as example,This studies of this paper is useful to the design of CNC machine tools,manufacturing and maintenance.
PLC communication is an important way to achieve factory automation,and it is the objective of building a multi-level automation system requirements.In this paper,principle and method of Mitsubishi FX series PLC communication was Introduced.Communications solutions and software hardware design methods of N: N network and parallel link network was focused on,and details of the application instances were given.
In this paper,the design method of the solar cells maximum output power control was introduced.And it was made up of solar panels,detection circuit,DC-DC transform circuit,controller,DC load,etc.With this device,the effective use of the solar energy was realized by sampling the solar cells output power real-time,calculating and adjusting the duty ratio of DC-DC converter,and changing the load absorption power to make the solar panels always keep the most high output power.This system has a cost-effective,easy maintenance design,stable and reliable advantage..
In this paper,12 virtual vectors with equivalent amplitudes are constructed,and a scheme of direct torque control on three-level inverter based on virtual vectors with fuzzy logic is proposed,based on space voltage vector of three-level inverter.The virtual vectors don't introduce midpoint current in principle,so don't cause fluctuations to mid-point voltage of DC;equal magnitude designed and selected with fuzzy logic can reduce the torque ripple effectively.The control of mid-point voltage is realized by adjusting the action time of positive and negative small vectors of virtual vector odd-numbered.The effectiveness of the proposed method is verified by Matlab simulation,and suitable for large-capacity AC drive system.
The features、innovations and applied materials of a large specifications AC contactor with new type save electricity technology are emphatically introduced.In particular,technical characteristics and innovations of products have been illustrated in detail,such as pulse-width modulation PWM,unique removable structure and fixed form of the lead wire.The large specifications ac contactor has high saving the electrical energy efficiency,very strong capability of resistance to voltage fluctuation,general AC/DC control voltage,stable and reliable operation,easy maintenance,to meet international and domestic trend with the latest AC contactor developments.
In order to make the machine tool servo parameters and mechanical properties to achieve the best matching,based on the machine tool servo parameter optimize,improve machine dynamic state characteristic and machining accuracy.According to the 840Dsl SINAMICS drive system,using Startup-Tool tools and systems with optimization function of servo parameter optimization through manual,frequency response,step response,reference model,FFW,TRACE,circular testing realization of velocity loop and position loop optimization,enhances the CNC processing precision and servo performance.
This paper introduces a principle to compensate the screw pitch error of rotary axis,as well as a system to measure the screw pitch error of rotary axis based on laser interferometer.Apart from that,the problems and solutions which may be met in improving the positioning accuracy of CNC rotary table through the screw pitch are also presented.
This paper summarizes the current situation of resistive touch-screen、capacitive touch-screen、infrared touch-screen、acoustic wave touch-screen,analyses the market of touch panel and propose that the future developing tendency is in-cell structure、multi-touch、tactile feedback.
Aiming at the current problems in the support of the CNC equipment about excessive maintenance and inadequate maintenance,the significance of Autonomic Logistics research on CNC equipment were analyzed.A startup signal was needed to operate the automotive support system,and the prognostics and health management system in the equipment was the very key that could power automatic response of the system.Based on the CNC equipment intelligence support system research,design,introduces the key technologies and methods.
The structure and function of AS/RS are introduced briefly in this paper.The configuration of the control system of AS/ RS based on GE PAC System is analysed.The paper puts the emphasis on hardware configuration of control system and process and method of control software development.Finally,the realization of the remote monitoring function is described briefly.The control system has advantages of simple,reliable,flexible and fine for its operation.
CNC machine tools have various forms of mechanical failure.In this paper,for example,describes the general form of mechanical failure in the form of CNC machine tools,diagnostic methods and the transmission of the common symptoms,Analysis of the reasons for the phenomenon have problems,And the corresponding methods of troubleshooting.Readers and maintenance personnel for the maintenance of CNC machine tools offer the idea of mechanical failure.
In the design of active power filter,the real-time detection of harmonic current is the key techniques of control and compensation.In the paper,based on the theory of coordinate transformation and instantaneous reactive power,we got the value of harmonic current.Meanwhile,to verify the theory's analysis,we used MATLAB to simulate the nonlinear load which is the uncontrolled bridge rectifier with capacitive load.The simulation results showed that we could effectively get the fundamental and harmonic components of the current.
The article to bedway grinder V model wheel dressers on the application of the original version,this paper focuses on the development of based on single chip microcomputer stepping motor controller application.
针对转向架构架生产、组装过程中温度具有非线性、时滞、随机性和动态时变等特点,提出了一种基于灰色预测的智能算法,首先,利用灰色预测的强自适应性,预测电阻炉炉温,减少了炉温滞后的影响,采用了一种参数自校正的模糊控制策略,对构架电阻炉温度进行控制;运行结果表明时效炉温度基本稳定在设定值的±5℃,经实践证明:该系统控制精度高,超调量小,能满足控制要求。
This paper introduces how to use the major functional blocks of MAP library instruction.The positioning control principle and the key technologies are elaborated based on MAP.With YL-335B,an automation production line,as an example,using the MAP library instruction can achieve a precise positioning control between the various stations.Finally,this paper gives a hardware design and a software design of the position control system.
