4 automation system implementation
4.1 Electric control system (1) Man-machine interface: The man-machine interface model selects Delta's DOP-AE80THTD type touch screen. It is characterized by the DOP-AE80THTD human-machine interface, which can reach zero temperature in the wild in winter; the graphics and text are clearly displayed in the shade of sunlight in summer. (The estimated DOP-AE80THTD brightness is 350 cd/m 2 ).
The display resolution of the DOP-AE80THTD is 640×480; 65,536 colors; the picture is as realistic as the digital photo, and the appearance is exquisite and generous. Easy to develop, easy to use, powerful and powerful editing software to be humanized, fully suitable for the system requirements. Two serial communication interface UARTs and two USB interfaces are configured, in which COM2/RS458 is connected to a programmable controller (PLC); a USB Host Ver1.1 port is used to connect the mobile U disk as a whole screen content dump.
The welding parameter setting screen in the man-machine interface uses the screen open macro and the screen close macro function and the screen cycle macro function Cycle. When the PLC internal clock and the man-machine interface clock are proofed, synchronization is required. The GETSYSTEMTIME command and the data transfer MOV command are used. The "system time and date button" on the screen is very convenient to set the real-time time in the PLC, so that the PLC internal clock and the person The machine clock and the local time zone are unified, ensuring the real-time and accuracy of the job record. Others such as oxygen flow setting, acetylene flow setting, displacement setting, pre-top pressure setting, upsetting pressure setting, etc. are completely represented by real numbers, which are represented by two decimal places of two digits. The heating time parameter setting and the like are represented by three-digit integers. Important parameters such as pre-top pressure and to-be-top pressure, if you set the non-conformity on the value, the flashing “wrong†word and audible alarm will be used until the “right†is displayed correctly. And the parameters set after the system is powered off will not be lost.
There are a total of eight parameters: 1 pre-top pressure 12.34Mpa; 2 top time 123Sec; 3 top top length 12.34mm; 4 top top pressure 12.34Mpa; 5 top forging length 1.23mm; 6 top forging pressure 12.34Mpa; 7 oxygen flow 123.45 SLM; 8 acetylene flow 123.45 SLM, as shown in Figure 4.
Figure 4 Process parameter setting screen
(2) Programmable controller PLC: The programmable controller is the core of the whole system. It consists of a CPU unit with digital and extended analog modules. The digital quantity completes the functions of position detection and limit of each valve and fine adjustment of gas flow; analog A/D part samples the mass flow rate of oxygen and acetylene gas, system pressure sampling, and sampling of rail forging displacement. The D/A section controls the valve opening of the oxygen and acetylene gas mass flow control. The gas mass flow control is performed by two independent closed loop systems with PID regulation. The pressure sensor adopts diffused silicon type, built-in pressure transmitter and linear correction circuit, 24V power supply, and the output current of 4-20mA standard current signal corresponds to 0-60Mpa.
4.2 Oil pump and press system
The ultra-high pressure oil pump produces the maximum pressure of the hydraulic oil that transmits power to 60Mpa, and the oil supply is more than 4 liters per minute. The electric cone type pressure regulating valve, pressure sensor, PLC and man-machine interface form a closed-loop control system, and the oil pump pressure keeps track of the pressure value set by the man-machine. The electric ultra-high pressure cut-off valve enables the oil circuit to be quickly commutated under high and low pressure conditions and has a holding function; the position of the valve is limited by the proximity switch (OMRON--PNP). The total bearing capacity of the press is capable of generating a maximum force of 70 tons under the action of the high-pressure oil pump, which satisfies the force required for the steps of the rail for upsetting, pushing and holding, and holding pressure during welding. In the whole process of welding, the center of the two sections of the rail is in a straight line, so that the bottom surface of the top surface of the rail is aligned to meet the mechanical strength requirements. The oil circuit between the oil pump and the press is interconnected by a special quick connector. At the moment, when the pressure is stronger than 32.5 Mpa, the reversing is still cutting-edge technology in the field of hydraulic control.
4.3 Heating system
It consists of a gas source, a pressure gauge, a controller, a gas mixer, an acetylene tempering preventer, an external combustion type heater, a gas filter and a gas quick connector, and a cooling circulation pump. The size and distribution of the flame aperture of the heater shall be such that the section of the rail is uniformly heated and the rail is heated to a plastic state (typically 1300 ° C) according to the welding procedure standard. Safety measures should be taken to prevent tempering of the pipeline and to prevent air leaks. The controller is more complicated; it consists of PLC part switch, analog unit, man-machine interface, and two gas quality controllers (D07-9E). Features large flow rate 200SML (N2); linearity ± 0.2% FS; accuracy ± 1.5% FS; repeatability ± 0.2% FS; response time 1Sec; leakage rate <1 × 10-8SCCSHe; with gas channel cleaning, shutdown, Valve control function.
4.4 Magnetic ruler
It consists of a resistive displacement sensor and a 5.2V reference power supply with a measurement accuracy of one hundredth of a meter. Three pieces of NdFeB are embedded in it, which is very convenient to install and disassemble. It is not necessary to set the geometric origin of the magnetic tape. The forging amount is automatically detected by the PLC program and calculates the relative difference of the rail displacement, which is directly displayed by the man-machine interface. When the rail is heated to 200-1000 °C, the axial expansion is obvious. The human-machine interface directly shows a negative value, and the system pressure increases. The human-machine interface dynamically reflects the changes of various parameters of the welding process in real time.
4.5 Fire-fighting mechanism
It consists of a DC adjustable speed motor, a variable crank linkage mechanism and a sliding small trolley. The jog button can make the heater fire hole be aligned with the weld between the two rails, and there is no carbon pollution between the welds during ignition. The rotational speed of the swaying motor is changed by the program, and the displacement linear velocity of the swaying fire is changed according to the cosine law, so that the heating effect of the rail can be optimized.
Previous Next
With a global reach, huge inventory, excellent warranties and great customer service, you won't find a better place to purchase Final Drives. Yanmar Final Drive,Yanmar Final Drive Assy,Yanmar Travel Motor,Yanmar Travel Gearbox,Yanmar Final Drive Spare Parts,Yanmar Drive Parts,Yanmar Motor.
With our great products, you know you will be receiving Quality parts at great Value. We make sure our customers get the lowest price on the market. We also offer fast Free Shipping and a Lifetime Replacement Plan with every purchase.
Yanmar Final Drive,Yanmar Final Drive Assy,Yanmar Travel Motor,Yanmar Travel Gearbox,Yanmar Final Drive Spare Parts,Yanmar Drive Parts,Yanmar Motor
Jining Juheng Hydraulic Machinery Co., Ltd. , https://www.sdjuhengmachine.com