尽所周知,沥青是作为我国公路建设过程中较为主要的道路使用材料,。普通市政道路中沥青的成本往往占比接近5成；尽管高速公路建设增加了征地等成本，但沥青采购一项所占的建设成本也往往超过2成。
As we all know, asphalt is the main road material in the process of highway construction in China,. The cost of asphalt in common municipal roads is often close to 50%; although the construction of expressways increases the cost of land acquisition, the construction cost of asphalt procurement is often more than 20%.
、煤焦沥青bai
. Coal tar pitch Bai
煤焦沥青是炼焦的副产品，即焦油du蒸馏后残留在蒸馏釜内的zhi黑色物质。
Coal tar pitch is a byproduct of coking, that is, the Zhi black substance remained in the distillation kettle after distillation of tar Du.
常规的煤沥是指从炼焦过程中产生煤焦油中提取出来的,我们称之为煤焦油沥青。煤集油沥青含有一定比例的多环芳烃,如、苯并芘等,这些多环芳烃属于有毒物质,它们会在修筑热拌沥混台料施工过程中排放易造成环境污染,危及人们健康。另外,据研究结果显示,牒沥青较石油沥的低温性能较差,容易产生低温开裂等现象,因此煤焦油沥膏的应用受到限制,现行技术规范对煤焦油沥青
Conventional coal tar pitch is extracted from coal tar produced in coking process, which we call coal tar pitch. Coal tar pitch contains a certain proportion of polycyclic aromatic hydrocarbons, such as, benzopyrene, etc., which are toxic substances. They will be discharged in the construction process of hot mix asphalt platform materials, which is easy to cause environmental pollution and endanger people's health. In addition, according to the research results, the low-temperature performance of diepitch is worse than that of petroleum asphalt, and it is easy to produce low-temperature cracking and other phenomena. Therefore, the application of coal tar asphalt is limited. The current technical specifications for coal tar asphalt
石油沥青是原油蒸馏后的残渣。
Petroleum asphalt is the residue of crude distillation.
、天然沥青
. Natural asphalt
天然沥青储藏在地下，有的形成矿层或在地壳表面堆积。
Natural asphalt is stored underground, some of which form mineral deposits or accumulate on the surface of the earth's crust.
沥青固化操作有两种：一种是将沥青加热与废物搅拌混合，一种是乳化沥青与废物混合，第一种方法对废物有一定干燥度要求，目前缺乏工业污泥脱水沥青固化一体化处理装置，
There are two kinds of asphalt curing operations: one is to mix asphalt heating with waste mixing, the other is to mix emulsified asphalt with waste. The first method requires a certain degree of dryness for waste. At present, there is no integrated asphalt curing treatment device for industrial sludge dehydration,
防爆投入式液位变送器的技术原理，允许危险气体进入隔爆外壳，外壳内可能产生爆炸。但要求外壳必须具有足够的强度；且各外壳结合面必须具有足够长的啮合长度和足够小的间隙，以确保内部爆炸不会穿过隔爆结合面而导致外部环境爆炸。防爆安全单晶硅投入式液位变送器拥有投入式液位变送器厚重的隔爆外壳，其设计承受内部爆炸性气体混合物的爆炸压力超过2MPa，阻止内部的爆炸向外部周围爆炸性性混合物传播，从而实现防爆性能。
The technical principle of explosion-proof input type liquid level transmitter allows dangerous gas to enter the explosion-proof enclosure, which may cause explosion. However, it is required that the shell must have sufficient strength; and the joint surface of each shell must have enough long engagement length and small enough clearance to ensure that the internal explosion will not pass through the flameproof joint surface and lead to the external environment explosion. The explosion-proof safety single crystal silicon input liquid level transmitter has a thick explosion-proof shell of the input liquid level transmitter, which is designed to withstand the explosion pressure of the internal explosive gas mixture more than 2MPa, to prevent the internal explosion from spreading to the external explosive mixture, so as to achieve the explosion-proof performance.
投入式液位变送器是基于所测液体静压与该液体高度成正比的原理，采用扩散硅或陶瓷敏感元件的压阻效应，将静压转成电信号。经过温度补偿和线性校正。转换成4-20mADC标准电流信号输出。投入式液位变送器的传感器部分可直接投入到液体中，变送器部分可用法兰或支架固定，安装使用极为方便。

Based on the principle that the static pressure of the liquid measured is directly proportional to the height of the liquid, the input liquid level transmitter adopts the piezoresistive effect of diffused silicon or ceramic sensitive elements to convert the static pressure into electrical signal. After temperature compensation and linear correction. Convert to 4-20madc standard current signal output. The sensor part of the input type liquid level transmitter can be directly put into the liquid, and the transmitter part can be fixed with flange or bracket, so it is very convenient to install and use.
公司的主要产品有SMART斯玛特系列压力变送器、液位(界位变送器厂家、流量计、温度传感器和多参量变送器，产品计量资质，防爆资质齐全，整个生产系统通过ISO9000质量认证体系认证。公司凭借专业技术优势，可靠稳定的产品质量，坚持大限度的满足用户的需求是企业发展的动力源泉，以优质专业的服务为我国电力、石油、化工、冶金、水泥、矿业、市政、造纸等行业提供了高性能价格比的工业自动变送器厂家产品。为我国自动变送器厂家的发展做出了重要贡献。
The main products of the company are smart smart smart smart series pressure transmitter, liquid level (boundary transmitter manufacturer, flowmeter, temperature sensor and multi parameter transmitter. The product measurement qualification and explosion-proof qualification are complete. The whole production system has passed ISO9000 quality certification system certification. Relying on the advantages of professional technology, reliable and stable product quality, and adhering to meeting the needs of users to a large extent is the power source of enterprise development. With high-quality professional services, the company has provided high-performance and price ratio industrial automatic transmitter manufacturers' products for China's power, petroleum, chemical, metallurgical, cement, mining, municipal, paper and other industries. It has made an important contribution to the development of automatic transmitter manufacturers in China.