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Afisez de la 1 - 9 din 279 jurnale.


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DG series boiler feed water pump
Adaugat pe 18/10/2018 12:11:09

This series of pumps is a segmented single-suction multi-stage centrifugal pump for the transport of clear water and other liquids with physicochemical properties similar to water. The maximum temperature of the medium is 160 C. It is mainly used for boiler water supply and mine drainage.


This series of pumps select excellent water conservancy model and structural design method, so advanced structure, high efficiency and energy saving is one of its remarkable characteristics. The structure of 100DM100 type drainage pump is slightly different, its inlet is in horizontal direction, while the inlet and outlet of DG series pumps are vertical upward, the performance is the same as 100DG, the highest head is 1000 meters. It is suitable for mine drainage.


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Tag-uri: wpc


Application of oil quenching vacuum furnace in heat treatment process
Adaugat pe 18/10/2018 08:38:15
Oxidation corrosion is one of the fatal flaws in product parts. In the past, the heat treatment of many products of a company in China was quenched by salt furnace. When the rainy season came, the parts had to be surface treated within one week. Otherwise, the residual salt would corrode the workpiece, which would lead to the quality problem of batch scrapping. In this season, the surface treatment of the product parts is usually carried out immediately after heat treatment to solve this problem. However, due to the large output and variety of the product parts, this practice increases the workload of the surface treatment workshop during the construction period, resulting in production arrangements. The pressure on it. In order to alleviate this pressure and achieve balanced production, the company introduced the VQ02-100 oil quenching vacuum furnace. Oxidation corrosion is one of the fatal flaws in product parts. In the past, the heat treatment of many products of a company in China was quenched by salt furnace. When the rainy season came, the parts had to be surface treated within one week. Otherwise, the residual salt would corrode the workpiece, which would lead to the quality problem of batch scrapping. In this season, the surface treatment of the product parts is usually carried out immediately after heat treatment to solve this problem. However, due to the large output and variety of the product parts, this practice increases the workload of the surface treatment workshop during the construction period, resulting in production arrangements. The pressure on it. In order to alleviate this pressure and achieve balanced production, the company introduced the VQ02-100 oil quenching vacuum furnace. 1. Parts processing technology analysis and new equipment support capability A variety of product parts produced by a domestic company are thin-walled, complex-shaped parts with folded edges, no through-holes, etc., and require no oxidative decarburization on the surface after heat treatment. The process uses a salt bath furnace to heat, although it can effectively prevent decarburization, but often residual salt is retained on the surface of the workpiece. Because it is difficult to clean thoroughly, it is caused by oxidative corrosion. The workpiece is heated in a vacuum to remove surface grease, decompose the oxide, and the surface is activated to improve surface quality. VQO-100 double chamber quenching and tempering furnace can guarantee the condition of high vacuum (10Pa). Firstly, it fully meets the requirements of non-oxidative decarburization and heating quenching of the workpiece. Secondly, the equipment is controlled by the program and automatically executes the set process parameters. The influence of human factors is ruled out; again, the temperature control system adopts PID to adjust the temperature automatically, and the uniformity of the furnace temperature can be controlled within 2 C. Related products: read more:

Tag-uri: wpc


Development of large vertical high pressure gas quenching vacuum furnace
Adaugat pe 16/10/2018 07:39:00
At present, vacuum quenching furnace is mainly vacuum oil quenching and vacuum gas quenching, each of which has its advantages and disadvantages. From the surface quality after quenching, the brightness of vacuum oil quenching is 20% ~ 30% lower than that of vacuum gas quenching, and it needs to be cleaned. From the mechanical properties of quenched workpiece, a white layer composed of residual austenite and carbide is formed on the surface of high speed steel tool after vacuum oil quenching. Carbides and retained austenite are composed of carbides, and the carbon to form carbides does not come from the residual atmosphere in the furnace, but from quenching oil. There are three factors affecting the cooling capacity of vacuum gas quenching: first, the type of quenching gas, the cooling capacity from high to low is H2, He, N2, Ar; second, the pressure of gas filling in quenching, the higher the pressure of gas filling, the stronger the cooling capacity of vacuum furnace, but when the pressure increases to a certain extent, its influence weakens; third, the transmission through the workpiece. The greater the flow rate of the heat medium, the greater the cooling capacity of the vacuum furnace. In addition, the cooling effect of high pressure gas quenching is also affected by the distribution of gas flow through the burden and the re-cooling of the heated gas flowing through the workpiece. In production and application, vacuum and high pressure gas-cooled quenching of 5-6bar (1bar = 105Pa) is still insufficient for quenched parts of low alloy steel, large-size dies, shafts and high-density loaded workpieces. In order to improve the quality of products, customers who produce large molds need faster quenching furnace. Related products: read more:

Tag-uri: wpc


Main components of vacuum furnace system
Adaugat pe 15/10/2018 09:39:00
Vacuum furnace system is mainly composed of vacuum system, heating system and related control equipment. The vacuum system consists of mechanical pump, diffusion pump, main path valve, bypass valve and high vacuum baffle valve. The mechanical pump is a coarse vacuum device, its power source is a three-phase alternating current motor, through the AC contactor suction and disconnection to achieve the pump's work and stop. The high vacuum oil diffusion pump is a high vacuum device. It uses the function of the front mechanical pump, the diffusion pump oil and the electric furnace heating to complete the high vacuum pumping work. The heating system is composed of heating power supply and heating elements. The magnetic voltage regulator is selected as the heating power supply, and the DC excitation power supply is used to realize the smooth stepless voltage regulation without contact with load. The DC excitation power supply is controlled by the power regulator. The power regulator uses the thermocouple to detect the difference between the current value and the set value of the furnace temperature. PID operation, output 4 ~ 20mA DC signal, control the magnetic saturation voltage in the magnetic regulator, and then according to the temperature control curve set by the temperature controller to achieve automatic control of heating current and temperature. In the designed distributed control system, the powerful data operation and processing functions of the computer are fully utilized, and the working state of the monitoring system is timely monitored, especially the automatic tuning of intelligent PID parameters is introduced to further improve the control index of the vacuum furnace system. Related products: read more:

Tag-uri: wpc


Metal heat treatment process
Adaugat pe 11/10/2018 06:36:08

Metal heat treatment technology can be broadly divided into three categories: integral heat treatment, surface heat treatment and chemical heat treatment. According to the different heating medium, heating temperature and cooling method, each category can be divided into several different heat treatment processes.


Different microstructure and properties can be obtained by different heat treatment processes for the same metal.


Steel is the most widely used metal in industry, and the microstructure of steel is also the most complex, so there are many kinds of heat treatment process of steel.


Integral heat treatment is the heat treatment process of heating the workpiece as a whole and then cooling it at an appropriate rate to obtain the required metallographic structure to change its overall mechanical properties. The overall heat treatment of steel consists of four basic processes: annealing, normalizing, quenching and tempering.


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Tag-uri: wpc


Alloy steel
Adaugat pe 10/10/2018 09:51:41

Alloying steel in addition to iron and carbon, adding other alloy elements, is called alloy steel. An iron carbon alloy consisting of one or more alloying elements on the basis of ordinary carbon steel. Special properties such as high strength, high toughness, abrasion resistance, corrosion resistance, low temperature resistance, high temperature resistance and non-magnetism can be obtained by adopting proper processing technology according to the different added elements.

Alloy steel has a history of more than 100 years. More steel is used in industry than in the latter half of nineteenth Century.

In 1868, R.F. Mushet, an Englishman, invented self-hardening steel with a composition of 2.5% Mn-7% W, which increased the cutting speed to 5 m/min.

In 1870, a 158.5-metre bridge was built on the Mississippi River with chrome steel (1.5-2.0% Cr) in the United States; later, some industrial countries used nickel steel (3.5% Ni) to build long-span bridges or to repair warships.

In 1901, high carbon chromium bearing steel was developed in Western Europe.

In 1910, S-4Cr-1V high speed tool steel was developed, and the cutting speed was further increased to 30 m/min.

After 1920s, stainless steel and heat resistant steel came out during this period.

In 1920, German Maurer (E.Maurer) invented the 18-8 type stainless acid resistant steel.

In 1929, Fe-Cr-Al resistance wire appeared in the US.

In 1939, Germany began to use austenitic heat-resistant steel in the power industry.


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Tag-uri: wpc


Impeller structure of centrifugal pump
Adaugat pe 10/10/2018 09:02:20

The structure of impeller is different according to the specific speed of centrifugal pump. The structure of impeller of centrifugal pump can adopt the form of radial flow impeller, mixed flow impeller or axial flow impeller.

Vacuum Pump

The runoff impeller and the mixed flow impeller can adopt the structure of open flow passage (without cover plate) or closed flow passage (with cover plate).


rotary vane vacuum pump

The axial impeller can be cast into a whole as a propeller impeller and hub. In order to better modify the pump characteristic curve, the blade can be designed as a semi-adjustable structure fixed in the hub, or in order to facilitate the adjustment of installation angle during operation, the blade can be designed as a fully adjustable structure.


It is not necessary to arrange propeller blades in a vertical direction with the rotating shaft of the pump. Especially when the propeller impeller with the advantage of easy adjustment of the mounting angle is used for high lift, the radial velocity component is needed to flow.

dry vacuum pump

In addition, in the transport of special media, special structure of the impeller can also be used. For example, single blade impeller, double channel impeller, three channel impeller, non-blocking impeller can see sewage pump and swirl impeller.


vacuum valve

Tag-uri: wpc


Importance of metal heat treatment in mechanical manufacture
Adaugat pe 29/09/2018 06:55:26
Compared with other processing technology, metal heat treatment generally does not change the shape of the workpiece and the overall chemical composition, but by changing the microstructure of the workpiece, or by changing the chemical composition of the workpiece surface, endow or improve the workpiece performance. Metal heat treatment is characterized by improving the internal quality of the workpiece, which is not generally visible to the naked eye. In order to make the metal workpiece have the required mechanical, physical and chemical properties, heat treatment process is often an important process step in addition to the rational selection of materials and forming process. Iron and steel is a kind of material widely used in machinery industry. The microstructure of iron and steel is complex and can be controlled by heat treatment. So the heat treatment of iron and steel is the main content of metal heat treatment. In addition, Al, Cu, Mg, Ti and their alloys can also be heat treated to change their mechanical, physical and chemical properties to obtain different performance. Related Products: read more:

Tag-uri: wpc


What is steel plastic composite pipe?
Adaugat pe 26/09/2018 06:12:43

The steel-plastic composite pipes are made of hot-dip galvanized steel pipes as the matrix, and are coated with plastics by powder melt spraying technology on the inner wall (or on the outer wall if necessary). Compared with galvanized pipe, it has the advantages of corrosion resistance, rust-free, scale-free, smooth and smooth, clean and non-toxic, and long service life. According to the test, the service life of the steel plastic composite pipe is more than three times of that of the galvanized pipe.316L Stainless Steel Welded Pipe With Low Price In China


Compared with plastic pipe, it has the advantages of high mechanical strength, good pressure resistance and good heat resistance. Because the matrix is steel pipe, there is no problem of embrittlement and aging. It can be widely used in water, gas, chemical products and other fluid conveying and heating projects, is an upgrade of galvanized pipe products. Because its installation and use method is basically the same as the traditional galvanized pipe, pipe fittings are the same, and can replace the aluminum-plastic composite pipe in the large-diameter tap water conveying role, welcomed by users, has become one of the most competitive new products in the pipeline market.
4 Stainless Steel 90 Degree LR Pipe Elbow

Tag-uri: wpc




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