Have you brought a hard hat and why do you want to bring a loophole? If it is not enough to cover the rain, how can we prevent high-altitude falling objects from protecting the head? Isn't that the helmet “unsafe�
Walking into the construction site recently visited, you can see this slogan everywhere: “With a safety helmet, safety depends on safety nets, safety is dependent.†Obviously, safety helmets, safety nets, and seat belts are the building management The focus of the work of the party, but a scene seen on the construction site, actually made reporters have to fall into the middle of thinking.
A worker wearing a hole in a safety helmet is earnestly carrying a watermelon. Since the summer, if you have a hard hat, is it a loophole to open the skylight? After careful observation, during the noon break, everyone ate hot watermelons on the construction site for everyone to buy. They took home and some sat on a hard hat. One of the helmets even had a hole. The reporter went to the side of the worker and asked: If you have a loophole in your hat, are you afraid of being carried away? The site master said with a grin: "This is cooler," said the watermelon rind in his hand. "You see everyone, the helmet is a decoration. When there is no stool, you can also be a bench." Several site masters told reporters that if it weren’t for us that we didn’t wear a helmet, the boss would have to be fined by the security department. If we don’t wear a safety helmet, the boss wouldn’t care. At the end, it was learned that the helmet of that loophole was originally a smashed hole in a screw on the construction site last year. It is not difficult to see that in these sites where the master is serious, wearing a safety helmet is not for safety, but for the boss to not be fined, so there is a loophole in this scene.
Relevant departments have repeatedly emphasized personal safety, but some construction sites are inevitably forced to buy cheap and inferior helmets for construction workers in order to save money. Some of them are even more like those mentioned above, but they are used as furnishings. China Labor Safety Net reminds everyone that the safety of the top of the head is not allowed. We hope that the relevant administrative departments will strengthen market supervision and effectively supervise and manage all aspects of production, sales, and use of safety labor and safety products, and pay close attention. Whether the end user wears the clothes as required Safe labor supplies.
[China Labor Safety Network Responsibilities Editor Chen Jia]
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Black metal industry standard of the People's Republic of China: Ultra High Power Graphite Electrode (YB/T 4090-2000) "regulation of the ultra High Power Graphite Electrode shape, size and allow deviation, technical requirements, test methods, inspection rule, packing, marking, storage, transportation and quality certificate. It is applicable to high - power Graphite Electrode, which is made of high quality needle coke as the main raw material, which is made of molding, roasting, impregnating, graphitization and machining.
Graphite is very common in nature, and graphene is the intensity of the highest substance known to mankind, but scientists could still take several years or even decades, to find a way to graphite into a large high quality graphene "thin film" method, thus they can be used to manufacture all kinds of useful material for mankind. According to scientists, graphene in addition to very strong, but also has a series of unique features, graphene or conductive performance of the best known materials, which makes it also has great potential applications in the field of microelectronics. The researchers even see graphene as a substitute for silicon that can be used to produce future supercomputers.
superiority
1: the increasing complexity of the geometry of the mould and the diversification of the product application result in the higher and higher demand for the discharge accuracy of the spark machine. The advantage of graphite electrode is that it is easy to process, high removal rate and low graphite loss. Therefore, some of the group spark machine customers have abandoned copper electrode instead of graphite electrode. In addition, some special shaped electrode can't made of copper, but easier to forming, graphite and copper electrode is heavier, not suitable for processing large electrode, these factors have caused part of the group of the graphite electrode spark machine customer applications.
2. Graphite electrode is easier to process, and the machining speed is obviously faster than that of copper electrode. For example, graphite is processed by milling process, and its processing speed is 2~3 times faster than that of other metals, and no additional manual processing is required, while the copper electrode needs to be worn by hand. Similarly, if you use a high speed graphite processing center to make the electrode, it will be faster, more efficient, and will not produce dust problems. In these processes, selecting the right tools and graphite can reduce the abrasion loss of the cutter and the breakage of the copper gong. If the concrete is the milling time of graphite electrode copper electrode and graphite electrode, graphite 67% faster than copper electrode, in the general case of electro discharge machining, the adoption of graphite electrode machining 58% faster than using copper electrode. In this way, the processing time is greatly reduced and the manufacturing costs are reduced.
3: the graphite electrode is different from the traditional copper electrode design. Many mold factory in copper electrode roughing and finishing usually have different requirements, and graphite electrode is used almost the same amount of reserve, this reduces the CAD/CAM and the frequency of machine, sheet is for this reason, to a large extent is enough to improve the precision of the mold cavity.
Of course, the first thing that should be clear is how to use graphite materials and other related factors after the copper electrode is transferred to graphite electrode. Today, some group spark machine customers use graphite for electrode discharge machining, which is exempt from the process of mold cavity polishing and chemical polishing, but still achieve the desired surface finish. If the process of time and polishing is not increased, it is impossible for the copper electrode to produce such an artifact. In addition, the graphite is divided into different levels, and in particular the application of using the appropriate level of graphite and spark discharge parameters to achieve the ideal processing effect, if in the use of graphite electrode spark machine operators use the same as the copper electrode parameters, then the result is certainly disappointing. If the material of the electrode is strictly controlled, the graphite electrode can be used in the non-loss condition (less than 1%), but the copper electrode is not used.
Ultra High Power Graphite Electrode
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Fengcheng Ruixing Carbon Products Co., Ltd , http://www.lnfcrxts.com