Application of PLC to transform hydraulic basic circuit test bench

View 6 mesh application, transform hydraulic basic circuit test bench Zhou Xingyuan Wuhan Institute of Technology Mechanical Engineering Wuhan 430073 and the basic components and basic functions of the software system.

0 Introduction The 6008 hydraulic basic circuit test bench is a hydraulic basic circuit comprehensive teaching experiment platform that can perform various hydraulic basic circuits and the functions and characteristics of each control valve in the circuit. It is a product of the 70s. With the rapid development and popularization of microcomputer control systems and the trend of mechanical products towards intelligent automation, in order to make the test bench better meet the requirements and development of modern electromechanical teaching experiments, we adopt programmable control. The control circuitry has been modified to extend and improve its functionality and scope.

1 Control system design 1.1 Twist system wiring distribution 0,8 hydraulic eucalyptus circuit experiment 1 The working principle of the liquid foundation system is as follows: 1. It is a mountain pump.

The liquid is made up of some electromagnetic reversal, and other components, to complete the liquid helium transmission class, the 坫 甩 甩 和 和 和 和 和 和 和 和 和 和 和 和 和 谐 谐 谐 谐 谐 谐 谐 谐 谐 谐 谐Happy and various relays to select and control the progress of each experiment, is a typical sequence and time control system.

Jiang is a kind of programmable controller, which has the characteristics of high reliability, strong control function, simple maintenance and so on. It is very suitable for the control system of this experimental platform. Therefore, we used the programmable controller as the main control unit, and carried out a comprehensive transformation of the electrical control system of the experimental bench, realizing the software control features of the automation program; and progressing and expanding its experimental content and scope.

It can be seen from the working principle of the hydraulic system that the various circuits of the hydraulic system are controlled by the direction of change of the electromagnetic reversing valve, and the solenoid valve is controlled by the on and off of the electromagnet. Therefore, as long as the programmable controller is used to control the electromagnet 糸 receiving date 200104 process puller wiring winter 2, the specific distribution of the output output points is as follows: input point total pity and bit button IOI delay, input button 102 automatic optional program switch 104 output point pump 1 start contactor 201 pump 2 start contactor 202 AC solenoid valve 1 Ding 13 called road finger small lamp latch color 213 1.2 Control system and program analysis The working characteristics of this test bench are based on the welcome of each control valve electromagnet Breaking to control the operation of the hydraulic system, so in the process of transforming the control system, the focus is on how to control the action tips of each electromagnet. 2.1 Hydraulic oil pump control The hydraulic oil pump motor in each circuit has different start and stop requirements according to different experimental items. In 3, when any of the 3103 of 3,73083 is closed, it will close 2, output current through it, and trigger the contactor after current amplification, thereby connecting the circuit of the motor 1 of the oil pump 1. When the motor 1 is operated, 312313 is closed to 1 time, it will close 2 melon through it output current, and after the current is amplified, the contactor is triggered, thus turning on the control of the oil pump 2 motor 1.2.2 shift register when automatically selected When the button 104 is closed, the program is in the automatic state. At this time, the 315 is set to 1 and the counter 1031 is started. The 61 number is completed and the second is counted. When the 2 count is completed, the 336 is set to 1.336. 1 has a function to make, 01 and 02 reset; is to make, 03 starts counting.

After 833 is set to 1, 04 is counted, and 337 is also set to 1; 337 is set to 1 to make 335 closed, 336 is turned off; so, 03 and reset; said to be 35 è¿“; The control of the wooden shifting device is to meet the time and number; to complete the work. In addition to the pulse of the shift register, the function of 0601 also cooperates with 02 603, 04 to control the time of the experimental process. After power-on, special relay 002 sends a pulse to make 349 in the shift register. When 01 is turned on, it sends a pulse to the shift register to shift the output and control the operation of each loop.

1.2.3 Control of hydraulic circuit In the traditional control, the relay and contactor control are usually used. Here, the intermediate relay control in Jiangzhong is adopted. This kind of relay is not a relay in the traditional sense. It is just a register unit inside 1. It can realize loop control in the original circuit through logic switching, and the hydraulic circuit is steered toward the steering of the reversing solenoid valve. The technical system, and the solenoid valve is converted by the on/off of the neodymium magnet, so it is necessary to screw the road. Just control the electromagnet. In the programmable controller control, the output of the river is directly connected to the electromagnet to be controlled by one person and nine people, and it is used to control the electromagnet. 2 System loop control analysis The following is a decompression loop experiment as an example to illustrate the experiment. The working principle of the control of the station. It can be known from the action cycle of the middle center that the decompression circuit experiment is divided into a partial cylinder 12 advancement; the cylinder 12 is retracted; and the check valve is maintained. Cylinder. 12 forward heart 1 屯 magnet 277> 18 people received 78 people to control. After the electricity, make two adjustments, the valve is connected. It acts as a back pressure to simulate the load; the back of the cylinder 12 is controlled by the electromagnet 4 into 5 people; the one-way holding pressure is controlled by the electromagnet 叮2781, according to the trapezoid in 1 When the 106 or 302 is set, the deduction loop operates.

With decompression circuit electromagnet electric action cycle electromagnet electric head inspection concave road decompression circuit cylinder 12 inlet cylinder 12 retracting check valve pressure injection Note + electromagnet electric connection 2.1 cylinder 12 advance this, Ding 503 At the beginning of the juice, the giant 315 sets 1315 as an intermediate relay. It is set to 1 and is logic-on, by which it is turned on to 20522212. The output of the trigger electromagnet 271891 is output by them, thereby screwing the liquid card to call the way.

The advancement of the cylinder 12 is achieved, and the retreat of the cylinder 12 is closed when the timing of the cylinder 503 is completed, so that the timing is started. At this time, 314 is turned on, by which it can be turned on 21 and turned on by the 216 output to trigger the external pulse, and find 1 electromagnetic 1 call. In the reverse direction of the intake circuit, the rear 2.3 check valve holding pressure of the blow-up cylinder 12 is closed. When the timer 504 is completed, the switch is closed, 1503314 is opened, 315316 is turned on, 315 can be turned on 20521022125, and the trigger electromagnet is outputted by them to 7 people. 8 into 9 into the switch-on, 316 can make 315203 turn on, 203 can turn on the AC electromagnet to make the oil unloading, observe the check valve holding pressure. Therefore, at this time, it is possible to connect 2 people, 7 people, 8 people, and 9 people, and they control the direction of the oil path to achieve the experimental purpose.

The other loop control is also the same as the control of the decompression loop. The logic of the intermediate relay is used to control the on-off to realize the drawing of the electromagnet, so as to control the simmering direction of the hydraulic circuit.

3 Conclusions The hydraulic basic circuit test bench is adopted. After the river control, its operational reliability is greatly improved, and many cumbersome operation time can be saved, which is convenient for students to better observe and think about the application characteristics of various valves in the experiment. The design and production cycle of the control design part is very short; by changing the program, the various work cycle states can be changed, and the function and range of the test bench can be expanded and lowered. On page 75, the convergence radius of the power series 32+1 is only =3 From the above example, we can see the role of the Cauchy Hadamard method. Therefore, the author of this paper believes that the radius of convergence of the power series is determined to be called the Advanced Mathematics Teaching and Research Program of Anfutong University. Take the variable version of the first edition. Beijing 1; 1 and so on. 1996. Ji 314. Privalov. Introduction to complex variable functions. Beijing People's Education Publishing House, 1956.5657.

2 Chang Hengyi. Programmable controller elbow. Beijing People's Posts and Telecommunications Press, 1991.

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