3 large industrial bus network status quo
485 network : RS485 / MODBUS is now a popular way of industrial networking, which is characterized by the implementation of simple and convenient, and now supports RS485 instruments and particularly large. Now the meter manufacturers have also turned to support RS485 / MODBUS, the reason is very simple, RS485 conversion interface is not only cheap but also a wide range. At least in the low-end market, RS485 / MODBUS will still be the most important industrial networking. HART Network : HART is an overbuilt bus standard proposed by Emerson. Its main feature is the digital signal superimposed on the 4-20 mA current signal, but the protocol is not really open. To join his foundation, Joining the foundation requires a fee. HART technology is dominated by several large foreign companies, in recent years there are companies doing, but have not yet reached the level of foreign companies. There are many smart meters now with [HART card] that support HART communication. However, from the domestic situation, there is no real use of this part of the function of equipment for network monitoring, up to just use the terminal to set parameters. In the long run, due to the low HART communication rate and networking difficulties, the application of HART meters will show a downward trend. Fieldbus Fieldbus Network : Fieldbus is one of the hottest technologies in today's automation field and is reputed as a computer LAN in the field of automation. Its appearance marks the beginning of another new era of automation and control technology. Fieldbus is a network of digital, serial, multi-station communications that connects control devices in the control room with instrumentation and control rooms. The key symbol is to support bi-directional, multi-node, bus-based all-digital communications. Fieldbus technology has become a hot spot in the world of automation and instrumentation development in recent years. Its appearance has revolutionized the structure of the traditional control system and made the automatic control system move towards the goal of "intelligent, digitalized, informatized, networked and decentralized The direction of "further" to form a new type of network communications fully distributed control system - Fieldbus Control System FCS (Fieldbus Control System). However, so far, the fieldbus has not yet formed a truly unified standard. Many standards such as ProfiBus, CANbus and CC-Link exist side by side and have their own living space. When unified, in the foreseeable future. At present, there are still a few types of instruments that support field bus, so there is little room for selection. The price is too high and the dosage is also small.
Daily maintenance of excavator hydraulic cylinders
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The hydraulic cylinder of an excavator is one of the important hydraulic components responsible for driving and controlling mechanical movements. In order to ensure the normal use of hydraulic cylinders and extend their service life, daily maintenance is necessary.
1. Regularly clean the hydraulic cylinder: During use, the hydraulic cylinder will be attacked by various pollutants, such as dust, sediment, oil stains, etc. These pollutants can affect the working efficiency and lifespan of the hydraulic cylinder. Therefore, it is necessary to regularly clean the hydraulic cylinder.
2. Regular inspection of seals: The seals of hydraulic cylinders are key components to ensure their normal operation. If the seals are damaged or worn, it can lead to oil leakage or unstable operation of the hydraulic cylinder. Therefore, it is necessary to regularly inspect the sealing components of the hydraulic cylinder and replace them in a timely manner if there is any damage or wear.
3. Regular inspection of hydraulic oil: The operation of hydraulic cylinders requires the support of hydraulic oil, so the quality of hydraulic oil has an important impact on the working effect of hydraulic cylinders. Regularly check the quality of hydraulic oil, and replace it promptly if there is contamination or deterioration.
4. Regularly check the hydraulic pipeline: The hydraulic pipeline is the blood vessel of the hydraulic cylinder. If there is oil leakage or damage to the pipeline, it can cause the hydraulic cylinder to not work properly. Therefore, it is necessary to regularly inspect the hydraulic pipelines and promptly repair or replace them if there is any oil leakage or damage.
5. Regularly lubricate the hydraulic cylinder: The piston rod and piston ring of the hydraulic cylinder need to be lubricated to reduce wear and friction. Therefore, it is necessary to regularly apply lubricating oil to ensure the normal operation of the hydraulic cylinder.
In short, the daily maintenance of excavator hydraulic cylinders is very important, which can extend their service life and improve work efficiency. Regular cleaning of hydraulic cylinders, inspection of seals, hydraulic oil, hydraulic pipelines, and lubrication of hydraulic cylinders are required.