The position control system consists of PLC and expansion module, PPI pulse comparison and output amplifier, AAI signal conversion unit, hydraulic servo valve controller, hydraulic cylinder displacement sensor (magnetic scale), amplification and phase detector and human-machine interface touch screen. Feedback closed loop control system. Since the original system computer OMRONC200H computer is broken, the computer is composed of Siemens S7-CPU226 plus digital input/output expansion module EM223, EM222 and analog input/output expansion module EM235. The touch screen is replaced and the control software is re-programmed. The load sorting is changed from qualified/unqualified two grades to qualified ones to four grades plus unqualified one grade. The CPU 226 is a DC input type and a DC output type, and has 24 points input and 16 point output. The EM223 and EM222 are 16DC input, 16RELAY output and 8RELAY output expansion module respectively, and the expansion module EM235 is used for analog signal input processing of the load cell. The parameter input and display of the control system is done using a touch screen. Edit and configure the screen with dedicated touch screen editing software. The PPI is a pulse comparison and amplification output board. It receives the pulse width modulation signal and the cylinder movement direction signal respectively sent from the PLC output terminals Q010 and Q011 and compares it with the hydraulic cylinder position signal detected by the displacement sensor, and then outputs the corresponding analog signal to the hydraulic servo valve, and drives the hydraulic cylinder to press The direction is moved to the given position.
Motion control process and the process of achieving positional motion. The order of motion control is: the hydraulic piston rod is returned to the origin (o), and the position at the origin is detected to be in place. It then moves to the operating point (w), which is done using the pulse width modulated signal (PWM) of the Q010 output, which is detected by the hardware (position sensor at the operating point). Then move from the working point to the required detection point 1 (x1). This process is completed by the pulse sequence signal (PTO) output from Q010. It is calculated by the software whether it is in place, that is, the displacement of the motion is equal to the number of pulses set by the software. The process of detecting point 1 (x1) moving to detection point 2 (x2) is the same as the process of moving from the working point to detecting point 1 (x1). The piston stays at the detection point 1 (x1) and the detection point 2 (x2) for a certain time in order to obtain a sample value of a stable load cell. Finally, it moves from the detection point 2 (x2) to the working point. The first half of the process uses pulse train (PTO) output control, and the second half is pulse width modulated (PWM) output, which is sensed by the position sensor at the operating point. Then, the next spring is detected in the same manner, thereby completing the spring load detection process. According to the above motion control method, the control program is programmed with a ladder diagram, and the experiment carried out on the spring detection table has been applied to the detection of the spring of the intake and exhaust valves of the actual motorcycle engine. Satisfactory effect.
Solid hardwood is what most people think of when they picture beautiful, authentic hardwood floors. As the name implies, solid hardwood flooring consists of single, solid pieces of wood nailed to a plywood subfloor. It`s extremely durable and customizable, and when properly installed can last more than 100 years. However, solid hardwood is sensitive to moisture, so it`s not recommended for bathrooms, kitchens, and other areas prone to spills.
Simple European Laminate Flooring
Laminate Flooring Tools,Simple European Collection Floor,Eir Laminate Flooring,12Mm Hdf Laminate Flooring
Shenyang Rongdida Wood Industry Co., Ltd. , http://www.rddfloor.com