The zero point setting of the toxic gas alarm means that when the alarm reaches a certain critical point when the toxic gas reaches a set point, a sensitive alarm is issued, thus playing a wake-up role for us. But how to determine the value of zero? One advantage of compressed air is that the gas is easily controlled and easily carried in the bottle. It is easy and convenient to get air through the device. This kind of air means a small amount of nitrogen and hydrogen compounds, carbon monoxide, carbon dioxide and some other interfering gases. It is worth noting that carbon monoxide gas cannot be filtered out by a filter with activated carbon. According to the judgment of the operator, the gas surrounding the sensor is fresh and no abnormal conditions exist. At this time, the indicator of the instrument is close to zero, and the zero setting process can be skipped. Therefore, the rule stipulates that the content of carbon monoxide in the cylinder must be the same as that of the ambient gas. Since the use of Suda ash filter on the sampling system pipeline can filter out carbon monoxide, this method is a good way to set the zero point of the CO2 sensor and it is easy to get the basic zero point. The zero setting of toxic gas alarm requires us to have certain experience and complete it in practice. We are committed to serving our customers with the business philosophy of being sincere, quality first, technology perfect, and business-to-business. For everyone to provide high-quality toxic gas alarm, high product configuration, reasonable price, worthy of your trust, welcome to buy our gas alarm, such as special security.
Investment casting technical flow process
The silica sol casting process also called precision
investment casting process. It is a less cutting or no cutting casting
process. It is an excellent technique in foundry
industry. Its application is very extensive. It not only applicable to various
types, various kinds of alloy and casting, and produce the casting dimension
accuracy and surface quality is higher than other casting method, Even other
casting method can not do the complex, high temperature resistant, not easy
machining castings, all can be used for investment precision casting process.
The investment casting process, it is a process that use fusible
materials make soluble model, and coated with several layers of tailor-made
refractory coating on the surface, after drying and hardening become a whole
shell, melt the shell model by steam or hot water. Then put the shells in the
sand, filling dry sand in all round and modeling. Finally roasting it based on
high-temperature in the furnace, the shell after roasting, and getting the
casting part after pouring molten metal.
The investment casting process can produce High precision
dimensional parts, generally can reach to CT4-6(sand casting is CT10-13, die
casting is CT5-7). Due to the complexity of investment casting process, there
are many factors influencing the casting dimension accuracy. Such as shrinkage
of mold material, deformation of the casting, Shell heating and cooling line
quantity change in the process, alloy shrinkage and deformation of castings in
the solidification process. The surface finish of investment castings is higher
than the ordinary casting, can reach to Ra1.6~3.2.
The greatest advantages of investment casting is casting parts
have high dimensional accuracy and surface finish, so it can reduce the
mechanical processing. The another advantage of investment casting method is
that it can cast all kinds of alloy and complex casting part, special casting
high temperature alloy casting part.
The precision of the Steel Casting Part: ±0.15mm~
Smoothness of surface of rough part: Ra6.4;
Shrinkage rate of steel investment casting products: 0.6%;
Material wastage rate: 5%;
General stainless steel casting part machining allowance: 0.7mm;
Surface preparation methods: Sand blasted, Shot blasting, Powder coating,
Painting, Plating, Electrophoresis, Polishing.
Our
company's production equipment and management system
CNC machining center: 8 sets AIGEMA A-8;
CNC lathe machine: 6 Guangzhou Machines and 7 Shenyang Machines;
Work days of one week: From Monday to Saturday;
Shift work: 2 shift per day;
Working hours: From AM 8:00 to PM 5:00;
2D and 3D drawing Software: AutoCAD, UG, Pro/E, SolidWorks 2013;
QC control: New type NANO CMM, FPI M5000 desktop metal analyzer, Easson
projector, Mechanical properties tester.
The steel casting process and machining
equipment:
Steel Casting Part Stainless Steel Lost Wax Casting, Steel Casting Part, Steel Investment Casting Part, Steel Silica Sol Casting Part NINGBO BEILUN LEMA MACHINERY TECHNOLOGY CO.,LTD , http://www.china-lema.com
