Posts made by xiaohei

Gas-fired boilers include gas-fired boiling water boilers, gas-fired hot water boilers, gas-fired steam boilers, gas-fired power generation boilers, etc. Among them, gas-fired hot water boilers are also called gas heating boilers and gas bathing boilers. [link text]( link url)https://www.vacfurnace.com/technology-frontiers/improvement-of-gear-vacuum-carburizing-and-quenching-process/
Compared with oil-fired boilers and electric boilers, it is the most economical, so most people choose gas-fired boilers as boiler equipment for steam, heating, and bathing. Gas boilers are different from other gas appliances in that they are installed in a special location, consume a lot of gas, and are products with high safety requirements.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/large-molding-gear-axis-real-vacuum-carbonate-quenching/

Temperature system operation: The user switching panel to the electric furnace is sent to the electric furnace. At this time, the program is charged, and the instrument (such as P, I, D parameters) is set according to the temperature instrument manual. Arrive 6kW.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/large-molding-gear-axis-real-vacuum-carbonate-quenching/
The program setting temperature must not be higher than the temperature furnace parameter temperature. When the electric furnace works, the furnace door shall not be opened. When taking the product, you should wait until the furnace temperature is below 100 ° C. When the heating is heated, the heating power must not exceed 6kW, otherwise the damage will be heated.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/carbide-tipped-gear-hob-vacuum-brazing/

Automatic control systems are widely used in various fields, especially in industrial fields, and temperature control is one of the most common control types in control systems. With the rapid development of single-chip microcomputer technology, controlling the controlled object through single-chip microcomputer has increasingly become an important development direction in the field of automatic control in the future. This design requires the design of an electric furnace temperature control system with a single-chip microcomputer.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/vacuum-heat-treatment-process-for-mining-gears/

The temperature control system is mainly composed of four parts: temperature sensor, temperature regulator, actuator, and controlled object. Its system structure diagram. The controlled object is a large-capacity, large-inertia electric furnace temperature object, which is a typical multi-order volume delay characteristic. In engineering, it is often approximated as a second-order volume delay with pure hysteresis; due to the large capacitance of the controlled object, SCR is usually used as the actuator of the regulator.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/carbide-tipped-gear-hob-vacuum-brazing/

Most of the boilers needed by industrial and mining enterprises in production are steam boilers. Steam is mostly used in production where a certain temperature of heat is required to meet the requirements of the production process, such as textile printing and dyeing, food sugar, rubber paper, petrochemical and other industries. Therefore, it is necessary to determine the saturated steam parameters of the boiler in accordance with the requirements of the production process. The advantage of saturated steam is that it can ensure a constant temperature required for production.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/fixture-selection-in-vacuum-brazing-furnace/

Generally, the pressure of the boiler is always higher than the saturated steam pressure required for production, the reason is to overcome the pressure loss in the pipeline or pipe network. At present, in many cases, the boiler nameplate pressure is much greater than the pressure required for production. For example, many users have purchased a 13-pressure boiler, but actually only use the operating pressure of 5 gauge or 6 gauge. Running at such a low pressure has adverse effects on steam quality. Because the pressure decreases, the specific volume of the steam increases, and the flow rate at the outlet increases greatly, so that the phenomenon of steam carrying water increases. Generally, the pressure required for actual production plus the pressure drop required to overcome all pipeline resistance plus 25% to 30% of the pressure margin is enough.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/effect-of-additives-on-vacuum-sintering-of-ceramics/

Boiler tubes are a type of seamless tubes. The manufacturing method is the same as that of the seamless pipe, but there are strict requirements on the steel type used in the manufacture of the steel pipe. According to the use temperature, it is divided into two types: general boiler tube and high pressure boiler tube.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/core-hardness-control-of-carburized-gears/
High-pressure boiler tubes are often under high temperature and high pressure conditions when used, and the tubes will be oxidized and corroded under the action of high-temperature flue gas and water vapor. Steel pipes are required to have high durable strength, high resistance to oxidation and corrosion, and good structural stability.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/vacuum-sintering-of-al2o3-ceramic-products/

A device that uses the heat energy released by fuel combustion or other heat energy to heat water or other working fluids to produce steam, hot water or other working fluids with specified parameters (temperature, pressure) and quality.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/research-on-vacuum-brazing-technology-of-ceramic-and-metal/
Boiler is a kind of energy conversion equipment. The energy input to the boiler is in the form of chemical energy in fuel, electric energy, heat energy of high-temperature flue gas, etc. After conversion by the boiler, it outputs steam, high-temperature water or organic heat carrier with certain heat energy.
[link text]( link url)https://www.vacfurnace.com/technology-frontiers/20crmo-gear-vacuum-heat-treatment-process/

As thermal equipment for smelting, roasting, sintering, melting, heating and other processes of materials or workpieces, relatively complete copper smelting furnaces have appeared in China as early as the Shang Dynasty in industrial furnaces, and the furnace temperature can reach 1200 °C. During the Spring and Autumn Period, with the development of technology to increase furnace temperature, cast iron appeared at that time.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/influence-of-vacuum-carburizing-and-quenching-on-new-gears/
In 1794, a straight cupola for melting cast iron appeared in the world. Then, in 1864, on the basis of Siemens (England) regenerative furnace principle, Martin (France) built the first steelmaking open hearth furnace heated by gas fuel. Through the high temperature preheating of air and gas in the regenerator, he made the furnace temperature reach the temperature above 1600 ℃ required for steelmaking.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/vacuum-heat-treatment-of-vacuum-carburized-alloy-steel-gear/

The stage from the fuel into the furnace to the ignition temperature is called the preparation stage. In this stage, the evaporation of water should be completed, the volatile matter should be separated out, and the mixture of fuel and air should reach the ignition temperature. Obviously, this stage is the endothermic process, and the source of heat is flame radiation and high-temperature flue gas backflow. In addition to the burner itself, the factors that affect the length of the preparation stage are the strength of the heat provided by the hot flue gas in the furnace for the pulverized coal flow, the amount, temperature, concentration, volatile content and fineness of the pulverized coal flow.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/vacuum-heat-treatment-of-vacuum-carburized-alloy-steel-gear/
When the ignition temperature is reached, the volatile matter is first ignited and burned, releasing heat to increase the temperature, and the coke is heated to a higher temperature and begins to burn. The combustion stage is a strong exothermic process, the temperature rises rapidly, and the chemical reaction is strong. At this time, the surface of the carbon particles often appears in an oxygen-deficient state. The key to the enhanced combustion stage is to strengthen the mixing, so that the air flow is strongly disturbed, so as to provide oxygen to the surface of the carbon particles, and diffuse the carbon dioxide on the surface of the carbon particles.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/stainless-steel-and-titanium-alloy-vacuum-brazing-process/

Tempering equipment description: The glass tempering unit is mainly composed of four parts: the discharge section, the convection heating section, the flat tempering section, and the section extraction section, as well as high-pressure centrifugal fans, air supply pipes, air collection boxes, air circuits, electrical control cabinets, and operating desks. Stainless steel and titanium alloy vacuum brazing process The forced convection leveling tempering unit adopts a unique injection flow increasing technology. By sucking hot air in the furnace and mixing it with preheated compressed air in the nozzle, the temperature of the airflow ejected from the nozzle to the glass surface is greatly increased, and the hot air in the furnace is circulated by convection. The forced reinforcement, the uniformity and stability of the furnace temperature are improved, so that the heating effect of the glass in the furnace is better. Compared with general compressed air convection models, the compressed air consumption is reduced by more than half. Aircraft engine rectifier vacuum brazing The transmission of each part of the unit adopts AC frequency conversion technology, driven by a motor, and the reciprocating drive speed is adjustable; the operation of each part is automatically completed by the control system composed of industrial computers and PLC; Electric balance, automatic on-off of the main air valve;VERTICAL METAL BAND SAWING MACHINE CV SERIES The main drive of the furnace body and air grid adopts O-shaped belt drive, and the furnace body adopts triple compound drive synchronization technology, that is, orthogonal circular drive belts plus interconnected circular drive belts; the main drive of the inlet and outlet tables adopts chain drive, with a simple and reliable structure. ;The furnace body and the main drive of the air grid are equipped with a manual emergency film output function when the power is cut off. According to customer needs, an emergency power supply device can also be added to ensure the low-speed operation of the ceramic roller table of the furnace body after a power failure.VERTICAL LONGITUDINAL CUTTING PULLEY TYPE METAL BAND SAW MACHINE G53 SERIES

Steel for high-strength bolts The chemical composition requirements of steel for high-strength bolts are as follows: Carbon is the most important element affecting the plastic deformation of steel. The higher the carbon content, the higher the strength of the steel and the lower the plasticity. The higher the carbon content, the lower the quenching heating temperature, the higher the hardenability, and the higher the tendency of cracking and deformation. Manganese can reduce the harmfulness of sulfur to steel.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/vacuum-sintering-of-quartz-ceramics/

Gas-fired hot water boiler refers to a boiler that uses flammable gases such as natural gas and liquefied petroleum gas as fuel, and automatically supplies hot water to meet people's daily needs such as heating and bathing. With the awareness of environmental protection and energy saving and emission reduction in the whole society, the energy structure of boilers and heating systems has also shown corresponding changes.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/17cr2ni2mo-steel-gear-vacuum-carburizing/
Gas-fired hot water boilers have received widespread attention due to their energy-saving, environmental protection, safety and automatic operation characteristics. At present, they have gradually replaced traditional coal-fired boilers and become the main heating method in cities.
How to effectively use energy-saving technology to reduce the operating cost of the boiler, further save limited resources, and prolong its service life as much as possible under the premise of safe operation has become an important issue for the staff.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/classification-and-selection-of-vacuum-carburizing-process/

The reasonable selection of the furnace bottom strength of the regenerative heating furnace is closely related to the furnace length, actual heating capacity, heating quality, and furnace operating conditions (combustion load, furnace pressure, maintenance cycle, furnace body life, etc.). However, there is no detailed information on the calculation of the bottom strength of the regenerative heating furnace. Through the selection and calculation of the furnace bottom strength in the medium-plate regenerative heating furnace project of a steel plant, it is ensured that the use effect is basically consistent with the actual capacity of the furnace.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/classification-and-selection-of-vacuum-carburizing-process/

(1) The selection of the furnace bottom strength of the regenerative slab continuous heating furnace. When the billet is a room temperature billet and the thickness of the raw material is 150-300mm, it should be based on the heat penetration time of the billet. The furnace bottom strength is generally 600-700kg ( m2.h) is more suitable.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/vacuum-pressureless-sintering-of-boron-carbide-ceramics-with-additives/

There are two types of suspension preheaters: cyclone preheater and vertical cylinder preheater. In the preheater, due to the contact surface between the raw material and the gas.Large volume and good heat exchange, so the thermal efficiency of the system is much higher than other kiln types.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/aircraft-engine-rectifier-vacuum-brazing/
The exhaust gas discharged from the main combustion zone enters the four-stage or five-stage cyclone after complete combustion in the subsequent combustion zone. The preheated raw meal enters the fuel decomposition and combustion zone of the D-D furnace from the three-stage or four-stage cyclone, and enters the kiln through the five-stage cyclone after preheating and decomposition.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/precision-gear-vacuum-heat-treatment-process/

1. When the electric furnace is used for the first time or is used again after long-term inactivity, it must be dried in an oven.
   Oven temperature and time:
   Room temperature - 300°C for 4 hours Open the furnace door to evaporate most of the moisture in the furnace.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/principle-of-vacuum-heat-treatment-process/
   300°C--800°C rapid temperature rise, close the furnace door.
   800℃--1000℃ for 3 hours Open the furnace door regularly until there is no moisture in the furnace door.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/large-complex-mold-vacuum-heat-treatment-process/

The focus pusher is made of Q345-B material, with water cooling wall; it is made of 16Mo3 material, without water cooling wall. Since the coke pusher is the core component of the coke pusher equipment and even the entire coke oven machinery, if the design structure of the coke pusher is unreasonable or the material is improperly selected, the entire coke discharge process will be affected. Therefore, it is very important to choose the structure and material of the focus pusher reasonably. The design structure, material and advantages and disadvantages of the two focus pusher rods are introduced below.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/rare-earth-low-temperature-vacuum-carburizing-process-of-20crmnti-steel/

The design concept of Yankuang 7.63m coke oven machinery is environmental protection, structural optimization and energy saving. Therefore, the coke pusher they designed is a cooling wall structure, that is, the coke pusher is cooled by circulating water, so that the coke pusher will not be thermally deformed and cracked due to excessive temperature in the carbonization chamber. The body material of the focus pusher is Q345-B, and the structure is a box beam type with water cooling walls on both sides.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/ndfeb-magnet-vacuum-sintering-process/

MBZ direct-type coal-fired hot air stove is composed of MBL coal-burning machine, high-temperature gas purification room and air mixing room. This device uses a coal-fired machine as the first-level heat supply. The raw (bituminous) coal is added to the coal hopper at one end of the coal-fired machine through the coal feeder, and the coal seam of a certain height is fed into the coal-fired machine at a uniform speed by the chain grate. In the combustion chamber, under the action of the combustion-supporting fan, the high-temperature flue gas generated by coal combustion is ejected from the side fire outlet of the coal-fired machine into the high-temperature gas purification chamber. [link text]( link url)https://www.vacfurnace.com/technology-frontiers/rare-earth-low-temperature-vacuum-carburizing-process-of-20crmnti-steel/
The high-temperature gas purification chamber is made of refractory materials, and the high-temperature flue gas undergoes secondary combustion in the purification chamber, and a small amount of dust entrained during the coal combustion process is polymerized and settled in the purification chamber by high temperature. The clean hot air (~1000°C) coming out of the purification room is mixed with a certain amount of cold air, and mixed to form hot air at the temperature (200-300°C) required for material drying, which enters the spray tower to dry the material (papermaking black liquor). [link text]( link url)
https://www.vacfurnace.com/technology-frontiers/influencing-factors-of-20crmnti-gear-vacuum-carburizing-and-quenching-deformation/

The new resistance furnace with full-fiber overturning trolley is a new type of product developed for the traditional brick resistance furnace, which generally has high energy consumption, low production efficiency, easy damage, poor temperature control accuracy and inconvenient loading and unloading. [9]( link url)https://www.vacfurnace.com/technology-frontiers/factors-affecting-vacuum-sintering-of-alumina-ceramics/
The full-fiber lining structure is adopted, which has excellent energy-saving performance. Compared with the brick resistance furnace of the same specification, it can save energy by about 30%, double the heating speed, and has good heat preservation performance. The full-fiber structure has good thermal shock stability and is resistant to rapid heat and rapid cooling.[l]( link url)https://www.vacfurnace.com/technology-frontiers/vacuum-carburizing-process-of-gear-steel/

The ventilation rate of the calciner also affects the outlet temperature of the calciner and the temperature of the lower part of the final cyclone. Even if the coal feed and material volume of the calciner remain unchanged, changes in the ventilation rate will also have an impact. When the ventilation rate is too large, the air velocity in the calciner is too fast, and the residence time of fuel and materials in the calciner is insufficient; https://www.vacfurnace.com/technology-frontiers/carbide-vacuum-brazing-process/
on the contrary, when the ventilation rate is too small, the gas supply is insufficient, and fuel combustion is also affected. In short, the fluctuation of the ventilation volume, the improper arrangement of the kiln air volume and the calciner air volume will affect the combustion of the calciner fuel, resulting in abnormal temperature at the outlet of the calciner and the temperature of the lower part of the final cyclone.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/304-stainless-steel-sound-absorbing-honeycomb-vacuum-brazing/

Basic inspection: Firstly, the sundries on the foundation should be removed, and a temporary and reliable fence should be erected on the edge; level gauges for measuring elevation, Ф0.5mm steel wire, wire hammer, ink fountain and adjustable brackets for pulling steel wire ropes should be prepared; foundation center given by civil engineering line position, check whether the vertical and horizontal centerlines are vertical.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/vacuum-annealing-process-of-steel-ring/
After the center line meets the requirements, use a hammer to cast the center position on the foundation embedded part or the foundation edge angle iron frame, and mark it; [link text]( link url)https://www.vacfurnace.com/technology-frontiers/research-on-properties-of-h13-after-vacuum-nitriding/

The main task of the aluminum alloy smelting furnace is to efficiently melt aluminum ingots, scrap and other furnace materials to prepare aluminum alloys. The development history of aluminum alloy smelting furnace is actually the history of continuous improvement and improvement of furnace efficiency in view of existing problems. The basic requirements for modern aluminum alloy melting furnaces are:[link text]( link url)https://www.vacfurnace.com/technology-frontiers/the-importance-of-brazing-holding-time/

1. Good thermal performance. That is, the melting speed is fast, the thermal efficiency is high, and the fuel consumption per unit output is small.[link text]( link url)https://www.vacfurnace.com/technology-frontiers/effect-of-magnesium-on-aluminum-alloy-vacuum-brazed-joints/
2. Good operability. That is, the furnace temperature is uniform, the furnace temperature, furnace pressure, and furnace atmosphere can be easily adjusted and controlled, and the charging and stirring are easy to realize mechanized operations, and the adaptability to fuel changes is strong.