Anti blocking regulating valve Botou Youjian Environmental Protection Equipment Co. LTD. , http://www.btdustmachine.com
With the rapid development of integrated circuits and computer technology, new vitality has been injected into the upgrading of numerical control hardware technology. Modern digital control systems commonly use VLSI, ASIC, and digital signal processing (DSP) technologies. Surface mounting (SMT) and three-dimensional high-density (3D) high density technologies are widely used in electrical installations to greatly improve system reliability.
High-speed, high-performance storage technologies such as flash memory and PCMCIA cards are extremely user-friendly. Thin film transistor liquid crystal display (TFTLCD) technology tends to flatten the display device, which facilitates the installation of electromechanical integration and improves the man-machine interface. As the core of the numerical control system, the processor uses a high-speed RISC CPU above the bit to ensure high-speed, high-precision CNC machining.
Architecture to open development
The discussion of open CNC has been for several years, but it should be noted that there has been no consistent definition of open architecture. Some users believe that Open Expression can accept locally used communication protocols; while others believe that openness means that all controllers have an identical user interface; for machine tool application engineers, open means that the tool holder moves, sensors and Logical controls have standard input/output interfaces; for large companies and university research engineers, open style means that these are all blocks of blocks that are immediately available. Due to pressure from end-users and integrators (machine tool plants), the development of open architecture is moving forward and will continue. The current positive result is PC-based CNC, PC-based.
Real-time operating system enters CNC
Strictly speaking, CNC control software contains the idea of ​​real-time operating systems, such as task scheduling, memory management, interrupt handling, etc., but this technology is implicit, and CNC applications such as interpolation, servo, decoding Such as mixed. Every CNC system is unique and opaque. This situation is inconvenient for end users and system integrators. With the increasing popularity of open CNC, it is logical to study the application of real-time operating systems in CNC software. In particular, the recent rapid development of embedded real-time operating system technology, which will have a revolutionary impact on the development of CNC control software. Choose a suitable commercial embedded real-time operating system, and put the NC application software, such as interpolation, servo, decoding, and data processing, up “hangingâ€, and finally migrate to a hardware environment to form a numerical control system that will ultimately satisfy the users. This is the personalized CNC system, which will be the main direction of open CNC.
Valve blockage is one of the common faults, especially when mud, pulp, pulp, caustic soda, or carbonized occasion are blocked. Except that the medium is not clean, the plug in the pipe will cause plugging. Therefore, it is necessary to have better anti blocking function, but there are no plugging valves at present, so it can only be considered from all aspects to improve its anti blocking function.
Anti blocking regulating valve
Selection of 1. valve flow patterns
A: from the structural point of view, the flow path of the straight stroke is S streamlined and the flow path is complex. So the anti blocking performance must be bad. Take the single seat valve as an example, after the medium flows into the valve from the horizontal direction, it flows vertically and flows out again. It can be seen that the complex flow of turning and turning can produce a lot of whirlpool dead zones, providing a precipitable space for the medium, so it is very easy to block up; from the combination of the sleeve and the valve plug, the gap between the two is small, and some unclean things will cause the jam. Look at the old single seat valve and the double seat valve. The direction of the lower cover is a dead zone where the medium precipitates. Precipitated things are easy to accumulate, causing the valve core to move downward very difficult, and valve blocking is not in place.
B: the angle stroke valve overcomes the problem that the flow path of the direct stroke valve is complicated and the upper and lower guide card is easy to plug in. The valve of the medium through the angle stroke seems to be straight out, the most typical "O" type, just like straight pipe, its anti blocking performance is the best, and the second is the eccentric rotary valve.
Selection of 2. type of throttling
When the medium flows through the throttle, under the same throttle area condition, if the throttle gap is small, the clean medium is not easy to pass through, so it is easy to clog; conversely, it is not easy to block. For the plunger type valve core, the throttle area is evenly distributed on the circumference, so the gap is the smallest; and then the window type valve core has the throttle area on the window, so the gap is larger than the plunger type, and the particles are easier to pass through. It can be seen that the more concentrated throttling area and the larger the throttling gap, the better the anti blocking performance. Such a typical product has a "V" type. Especially in the small opening work, the "V" type of throttling area is more concentrated, and more difficult to block the card, which fully demonstrates the "V" type of anti blocking advantages.
3. common measures for anti blocking:
In addition to improving the traditional flow path and improving the linear flow prevention measures, some anti blocking measures can be adopted for the medium, such as pulp, pulp, slurry, pulp and other media.
1) the smooth flow of the flow, the more balanced the better the transition. In view of the advantages of high concentration of thick slurry, poor fluidity and easy settlement, the direct through shell structure is adopted to minimize flow resistance and prevent blockage (that is, the diameter of the shell flange, and the outlet is larger than the import). This measure is very effective for thick slurry and other occasions.
2) according to the calculation, if necessary, the valve seat diameter can be reduced to improve the flow speed of the throttle port so as to improve the "self-cleaning" function of the valve itself.
3) add punching and sweeping interface before the valve seat, and use high pressure air or water to clean and block the inner cavity of the shell.
4) use an actuator with sufficient torque and strength.