How does the stone production line block dust pollution

Because of stone crusher is not fully closed, at work, being hit by extrusion, stone, stone clearance of air is extruded and high-speed outward movement, lead dust with escape, instantly raise large amounts of dust. The dusty air passes down through the chute (a few) or through the feeding mouth (most), causing a high concentration of dust around the feeding mouth. Being in this state for a long time will not only cause serious pollution to the environment, but also cause great harm to the human body. So how to control the dust pollution of the crusher, as a professional broken equipment manufacturer, which aspects should we improve?vacuum furnace

(1) close control will seal the dust source with a sealed cover to make the dust not spread widely.vacuum furnaces

(2) eliminate highly potential difference handling equipment hopper, shield, chute, etc for powder, high potential difference generated by the difference of the main causes of spillover is the dust float in the sky, try to reduce the gap, reduce the chute chute inclination, some secret chamber caused by negative pressure best closed, such ability for dust collection.

(3) the wet dust removal and exhaust dust removal according to the reasons of the dust, dust source can be set respectively control countermeasures: in the feeding mouth and tape transshipment point setting spray device, and to control the amount of water wet stone, can significantly reduce the crushing plant transfer point inside the dust pollution; When the reprint point, especially when the underground construction of the underground building is bad, the centrifugal fan should be used, the ventilation should be forced and the wind speed and air volume should be enhanced. When the dust is produced by the operation of the tape, the negative pressure control system of the cloth bag filter is adopted to control the dust source.
vacuum tempering furnace vacuum oven

The heating principle of induction furnace

   Electromagnetic furnace is the application of electromagnetic induction principle to food heating. Electromagnetism furnace face is heat-resistant ceramic plate, alternating current through the ceramic plate at the bottom of the coil magnetic field, magnetic field at the bottom of the magnetic field lines through the POTS, stainless steel pot, etc, produce eddy current, make the bottom of the pot hot quickly, achieve the goal of heating food.vacuum pump,vacuum furnaces,vacuum coating machine

  Its working process is as follows: ac voltage rectifier is converted to direct current (dc), and the high frequency power conversion device make it become a than audio high frequency alternating current, direct current (dc) to high frequency alternating current (ac) on flat hollow spiral induction heating coil, the resulting high frequency alternating magnetic field.vacuum furnace

 Its magnetic force lines penetrate the ceramic panels of the hearth and act on metal POTS. In the cooking pot, there is a powerful eddy produced by electromagnetic induction. The eddy current can overcome the internal resistance of the pan to complete the conversion of electric energy to thermal energy, and the resulting joule heat is the heat source of cooking.vacuum varying pressure nitri ing furnace

The superiority of multi-oven continuous vacuum furnace

The superiority of multi-oven continuous vacuum furnace

1) multi-oven continuous vacuum furnace in the process of running, preheating chamber, high temperature studio keeps in constant temperature and high vacuum state, to avoid the moist air to the frequent attacks and pollution of heating area, greatly reduces the suction of the vacuum system load and improve the work vacuum, vacuum time.
(2) to avoid the thermal shock of the impact of the heater, high temperature oxidation prevent heater, improve the service life of the heating chamber.
(3) without having to repeatedly as intermittent vacuum furnace for pumping air into vacuum state, put the atmosphere, warming and cooling is both time-consuming and energy-consuming process operation, thus greatly improve production efficiency. Generally speaking, 3 rooms, five, seven continuous vacuum resistance furnace its production efficiency are the same size of hot spots of single chamber intermittent vacuum furnace three times, five times, ten times.
(4) a large number of save energy, reduce the production cost.
(5) improve the quality of products, ensure the product quality is stable, reliable, consistent, and improve the product percent of pass.
6. High degree of automation and easy operation.

Analysis of the single crystal furnace furnace cover for profile

Analysis of the single crystal furnace furnace cover for profile

Single crystal furnace furnace cover is commonly oval head. Due to its good mechanical properties and processing technology. It is widely used in industry. In the production of single crystal furnace, often encountered in the welding ellipsoidal head to take over the problem. This kind of production enterprises in China are generally use manual and welding. The backward mode of processing not only processing efficiency is low, and the machining quality is difficult to meet the design requirements, the production efficiency and welding quality is affected.
Main components of the ellipsoidal head is half elliptical shell. Shell is limited by two surface objects, uniform shell thickness of each point in the midpoint of the curved surface is called shell surface, the surface formed by surface of revolution is called the revolving shell, the shell surface in the busbar rotary formed a revolving shell. Therefore, represented by an elliptical head surface in busbar elliptical head geometry.
Spread principle, the single crystal furnace general elliptical head takes over the shape of cylinder cover, the case is the top surface is divided into many small line segments, each segment and the adjacent two plain wire and nozzle-vessel junction line to form a quadrilateral, obtained the side length of each side of the quadrilateral can expand the quadrilateral, such one by one on all quadrilateral is the ellipse over expansion plan.
Surface is considered to be a move line in space motion trajectory, the line is called bus, bus bar in the surface in a position, known as plain wire. Available to take over the plain wire cylinder and elliptical head surface intersection; Then calculate the corresponding node. Point to the distance on the surface of the ellipse to take over the top is the prayer plain wire length.
General furnace cover elliptical head over the single crystal furnace is a common problem in practical production. We use parallel expansion method taking over a mathematical model is established, with the aid of computer promptly and accurately draw a diagram, fast and exact underground material, thus to take over the precast, slope and the curve of the head group H in uniform after clearance, improved the welding speed, improves the production efficiency and product quality.

The two kinds of single crystal furnace control method

The two kinds of single crystal furnace control method

Do you know about single crystal furnace? Single crystal furnace in the process control method specific how should do?
The first: zone melting method
Zone melting method, the operation of the process is to avoid the pollution caused by chemical reaction between melt and crucible, and developed without crucible crystal growth process.
This method applies only to melt the surface tension coefficient of crystal growth. Vertical installed a polycrystal bar, use water cooled rf, melt heat should make one end of the stick. On the surface tension of the melt and levitation force produced by the electric field, make the melt and crystal rod sticking together. Put a treated with directional seed crystal end into the melt, using the relative motion of heater and crystal melt polycrystalline rods melt unceasingly, but on the other side gradually generated crystals. This method makes the growth of crystals will not polluted by the crucible.
The second: the czochralski method
Czochralski method is also called "klaas base method" (Czochralski method, hereinafter referred to as CZ method. Is the main method of single crystal silicon growth. The law is in czochralski method (CZ) single crystal furnace, the raw material (polysilicon) is placed in a crucible of the heated to a molten state, seed crystal, introduced into the molten silicon, seed crystal sandwiched between the lower end of the rod, appropriate control temperature. When the seed crystal and molten silicon to achieve balance, to support the surface tension of liquid and will be against the adsorption in the bottom of the seed crystal. The rotation while tyra seed crystal, the adsorption of melt movement will be as the seed crystal up. Upward movement in the process of the melt temperature to drop, will make the melt condensation into crystalline and grow into a single crystal rods as seed crystal direction.

The influencing factors of vacuum furnace temperature to transfer the three main factors

The influencing factors of vacuum furnace temperature to transfer the three main factors

According to the temperature field distribution equations, the internal heating type vacuum furnaces the whole temperature field distribution, mainly depends on several aspects of constraints. Namely material average coefficient of thermal conductivity, the average density of P and q on average than hot melt c.. Factors that influence the vacuum furnace temperature to transfer includes the following three points:
1: the strength of the furnace heating element, in the design, mainly in the form of inner heat source. Internal heat source heating, temperature, from inside to outside. The strength of size directly affect the temperature distribution in the furnace. By (5) it can be seen that when the higher the heat inside roar, a fixed point of the higher the temperature, at the same time a certain temperature difference (delta T) of (r), the greater the distribution area. So, in the actual production process, can control the surface of the furnace core through the load or furnace core power control furnace temperature distribution.
2: the response is the distance from the furnace core (delta r), when a certain core power, namely the inner heat source strength must be, the farther distance furnace core of reaction, the lower the temperature, may not be able to reach required temperature reaction. The closer distance furnace core, the higher the temperature, the reaction.
3; Burden of heat dissipation performance, the burden of the heat dissipation performance, the better, the faster the internal heat loss outward, heat loss in the reaction of material very easily, cause a fixed temperature decrease. But if the cooling performance of the reaction is not good, is needed for the convergence of heat, allows heat to pass time lengthen, conducive to the material to absorb heat and reaction, raise the temperature of a fixed point. Should be under the condition of high vacuum (pa) 4 ~ 13, reaction temperature 1200 ℃, the core temperature will soon be able to achieve the required value, so the reaction time of depending on the thickness of the material, namely the reaction furnace core periphery expect furnace insulation distance. Can through the design of furnace size control power supply time.

Continuous high temperature brazing furnace working principle and composition

Continuous high temperature brazing furnace working principle and composition

High temperature continuous brazing furnace is the decomposition of ammonia decomposition equipment out of hydrogen after purification of hydrogen nitrogen mixture as protective atmosphere under the influence of continuous brazing and bright annealing of special equipment, main use: iron base, copper base workpiece workpieces, continuous brazing of stainless steel workpiece and light processing.
(1), continuous brazing furnace parts:
The equipment by the actuator (feed), the preheating section, heating furnace, cooling section, driven organization (discharge), sea pneumatic control system, electric control system and liquid ammonia decomposition furnace, etc.
1, the working principle of the
Work-piece with stainless steel mesh belt transmission, placed on the mesh belt, from the preheating section inlet, through the mesh belt transmission, through preheating, heating, cooling (solder melting). From cooling period of discharging of artifacts within the muff ruler is pure hydrogen gas protection, due to the reducing hydrogen gas, make the product surface bright, no oxidation. Artifacts is welded by heating the workpiece, melt filling material (solder), using capillary action to make liquid solder filling the space between the parent metal, welding after cooling to achieve.
2, work process
Manual feeding to mesh belt transmission, the preheating section - mesh belt transmission - heating section (solder melting) - > mesh belt transmission to cooling section, manual

The advantages of vacuum furnace

The advantages of vacuum furnace

1, completely eliminates the oxidation and decarburization on the surface of the workpiece during the process of heating, clean surface without metamorphic layer can be obtained. That only when grinding mill side of cutting tools (such as after twist drill grinding groove on the surface of the decarburization layer directly exposed to improve the performance of blade, cutting relationship greatly.
2, on the environment pollution-free, "three wastes" treatment is not required.
3, obviously improve the temperature measurement, the monitoring precision. Indicated value of thermocouple temperature and furnace temperature reached plus or minus 1.5 ° c. But in different parts of a large number of artifacts in the furnace temperature difference is bigger, if USES the rarefied gas forced circulation, can still be controlled within + / - 5 ° c temperature difference.
4, high degree of mechanical and electrical integration. Increase in the temperature measurement and control accuracy, on the basis of the workpiece moving, pressure adjustment, power adjustment, etc all can set programming in advance, according to the steps to implement the quenching and tempering.
5, significantly below the salt bath furnace energy consumption. Modern advanced vacuum furnace heating chamber is made of high quality insulation material of insulation walls and barriers, electric energy can be highly focused on indoor heating, energy saving effect is remarkable.

The basic principle of the vacuum furnace and performance advantages

The basic principle of the vacuum furnace and performance advantages

1.1 the principle of vacuum furnace and structure
Mainly by the furnace, smoke tube, heating coil and a chimney. Using the negative pressure of steam heat exchange technology, the runtime will be used as heat medium of the liquid level control between the smoke and fire tube and the heating coil, the pressure in the furnace is made by high temperature exhaust gas pressure, operation and control the negative pressure condition. Full combustion of fuel burner, heating tube and the fire heat pipe is passed to the pot shell intermediate medium water, boiling water is heated by the liquid into gas phase evaporation, water vapor gradually filled with gas phase space of the furnace body, because the coil is the heating medium and the tube wall temperature is lower than the steam temperature, so that the vapor in the outside wall of the condensing coil, and the heat transfer medium to coil. After the condensation water in gravity whereabouts backwater space. Cycling heat process was realized. To take the negative pressure of heating furnace operations, mainly considering the security issue, the normal pressure will cause the high temperature furnace flue gas leakage, heat loss increase, not only will cause the destruction of the stove itself and the harm to personal safety.
1.2 the advantages of vacuum furnace
(1) safe and reliable, energy saving water. Negative pressure, can be exempt from explosion hazard.
(2) the furnace combustion, the system is not easy to scale. Using pipe, corrugated pipe do itself as a thermal compensation device, with self-cleaning heat bilges cold shrink role, is not easy to scale.
(3) high thermal efficiency, environmental protection and energy saving. Adopts the design of positive pressure combustion type, ensure high efficiency heat transfer, fuel efficiency as high as more than 99%, compared with the traditional boiler, fuel can save about 17%; Low nitrogen oxide and carbon monoxide generation makes flue gas emissions clean, no pollution to the environment.
(4) the fuel adaptability is extensive, natural gas is a plus.
(5) the high degree of automation control, the user can on-demand configuration.

Good performance of vacuum brazing furnace

                          Good performance of vacuum brazing furnace

Vacuum brazing furnace to maintain excellent soldering quality depends on the performance of the vacuum unit. Often, vacuum pump needs to be careful not to think that "you never turn it off, it will run forever." If vacuum maintenance crew at the time, on weekends and holidays shutdown, more economical to do so. Otherwise, if still idling at the weekend, mechanical pump will be stuck and difficult to start again. The results of our experiments show that this method can save a lot of electricity.
Due to the lack of water or overheating, mechanical pump overheating, and noises. It's better to keep the water temperature is 140. (60 ~ 150 F a 6 ℃), the use of portable devices to pump oil filter once a week, check the oil level and take sample, check the oil quality by feeling and appearance. A few years ago, we have found that the mechanical pump with high quality oil is more economic. The cost of high quality oil is generally more than three times of industrial oil, and keep the pump qing jie time is five times the sustainable. Live a door should be changed every three months and spring. Stainless steel spring live longer.

The safety of the vacuum furnace characteristics

The safety of the vacuum furnace characteristics

Vacuum furnace that vacuum heat treatment technology and comprehensive technology, the combination of the two professional heat treatment is to point to the whole and part of heat treatment process in a vacuum. Our country could be divided into low, medium and high vacuum and high vacuum. At present most of the vacuum heat treatment furnace work vacuum degree in 1.33 ~ 1.33 x 10 ˉ after Pa.
Vacuum heat treatment can achieve almost all heat treatment process, such as quenching, annealing, tempering, carburizing, nitriding, during the quenching process can realize gas quenching, quenching oil, water nitrate quenching, quenching, etc., can also be vacuum brazing, sintering and surface treatment, etc. Vacuum heat treatment furnace thermal efficiency is high, which can realize the rapid heating and cooling, which can realize no oxidation and decarburization, carburizing, can remove phosphorus crumbs on the surface of the workpiece, and has the effect such as degreasing degassing, so as to achieve the surface brightness purification effect. Generally speaking, the processed workpiece in the heating furnace is slow, and internal temperature difference is small, the thermal stress is small, so little deformation. Product qualified rate is high. Can reduce costs, have degassing effect, so as to improve the mechanical properties of the work and life. Good working environment, safety operation, no pollution and no pollution. Be processed workpiece no hydrogen embrittlement risk, to prevent surface of the titanium and refractory metal shell hydrogen embrittlement, stability and repeatability of vacuum heat treatment process. A series of advantages, the development of vacuum heat treatment equipment and process was more and more attention and applied more and more.

H13 Tool Steel Heat Treatment Technology

H13 Tool Steel Heat Treatment Technology

H13 tool steel after heat treatment to obtain excellent performance, such as high strength, red hardness and high impact toughness. From the analytical H13 steel chemical composition start the selection of high-temperature ball annealing, quenching and tempering made secondary instructions provided process data, and gives five production practice experience gained in the conclusion.
H13 steel is widely used internationally a hot die steel, because it has a good impact toughness at high temperatures, wear resistance, ductility, hot hardness and applied die casting, forging die and extrusion die manufacturing. This article describes a heat treatment process H13 steel after forging change.
1, The chemical composition of the steel
H13 steel is the American National Standard ANSI steel, the equivalent of China GB / T1299 4Cr5MoSiV1. H13 steel in Cr, Mo, Si, V and other alloying elements [1], shown in Table 1, except Si element does not form carbides, Cr, Mo, V three elements will combine to form special carbides with carbon, these special carbide will improve the steel tempering resistance.
Chemical composition Table 1 H13 tool steel.
Influence of Cr: Cr with carbon to form special carbide, chromium carbide as a solid solution in austenite can increase over the stability of supercooled austenite. When it is dissolved in the tempered martensite contribute to enhancing its ability to promote secondary hardening effect, more Cr main purpose is to raise H13 steel hardenability, high temperature strength and high temperature oxidation resistance [2].
Influence of Mo: Mo is a carbide-forming elements, in H13 steel can improve the steel tempering stability and wear resistance.
Influence of Si: increase steel strength, hardness and resistance to tempering, heat treatment furnace at the same time weaken the oxidizing atmosphere.
Effect of V: The lower thermal sensitivity of steel to improve stability of steel tempering and secondary hardening effect, the vanadium carbide particle dispersed can greatly improve the wear resistance of steel.
2, The heat treatment process selection
2.1, The critical point
The heat treatment temperature, cooling method depends on the critical transition point of steel and isothermal transformation diagram. 1) H13 steel critical point: Ac1,850 ~ 885 ℃, Ac3: 910 ℃. 2) cooling transition critical point: Ar1,700 ℃; Ar3,820 ℃; Ms, 335 ℃. 3) austenitizing temperature: 1 010 ℃.
2.2, Annealing
In order to H13 steel forgings eliminate stress, improve the organization, grain refinement, lower hardness, ease of machining, the need for annealing. H13 alloy elements more change when heated slowly, it can not and should be used with conventional annealing temperature ball annealing, the alloy carbides form a uniform granular material, to give a fine granular pearlite. High temperature ball annealing temperature should be slightly higher than the heating temperature of Ac1 critical point of steel, were kept at the same temperature, is conducive to retain undissolved carbide particles, the cooling process, these dots can become granular structure of nuclei, guaranteed uniform fine granular structure.
Cooling ball annealing in Ar transformation point should be in the region isothermal treatment, prompting the formation of fine granular pearlite and carbide aggregation of fine particles contribute to reduce hardness, ease of machining.
2.3, Quenching
H13 steel has good hardenability, of less than 150 mm thick parts oil quenching to achieve a uniform hardness. But because the steel contains Mn, Si element prone to oxidation and decarbonization. In the production practice, the proposed salt bath, controlled atmosphere heat treatment, vacuum heat treatment can also be used for anti-covering or coating decarbonization protection.
Select 1 030 ℃ quenching temperature can be obtained hardness 54 ~ 55 HRC, 1 040 ℃ grain begins to grow. It is recommended heat treatment temperature range 1 030 ~ 1 040 ℃. Special attention should also be released when the pre-cooling to Ac3 above 20 ~ 30 ℃ (950 ~ 980 ℃) in order to reduce stress concentrations, thus avoiding cracking.
2.4, Tempering
In order to eliminate stress and improve the toughness of H13 forging at high temperatures must be tempering. The use of H13 steel alloying elements good resistance to tempering and secondary hardening effect, using secondary tempering can improve die life. Tempering temperature (580 ± 20) ℃ obtain hardness 47 ~ 52 HRC. Organization after tempering is tempered martensite and a small amount of granular carbide.
3. Conclusion
H13 steel after heat treatment has a good red hardness, high-temperature toughness and thermal fatigue resistance. To ensure the quality of heat treatment, production should pay attention to the following points:
1) Inspection of raw materials: the need to make the macro defect inspection, to discover such as slag, center shrinkage, folding, surface cracks and other defects.
2) After forging Forging should slow furnace cooling or cold, and timely annealing.
3) The H13 steel is easy to oxidation and decarbonization, so die blanks allowance should be increased after the soft spot in order to avoid hardening.
4) After the mold rework must be low-temperature annealing in order to avoid re-quench cracking.
5) during heat treatment operations should be strictly in accordance with operating instructions.

Gas circulation technology of vacuum tempering furnace and gas quenching furnace

Gas circulation technology of vacuum tempering furnace and gas quenching furnace

 In order to overcome the low temperature vacuum tempering, easy to cause uneven heating and vacuum tempering after cooling speed slower, etc, were using forced gas circulation at the time of heating and cooling heat transfer technology, using two gas circulation system in the structure.
  Vacuum tempering furnace gas circulation system, set on the top of the furnace thermal cycling fan, when heated to charge a small amount of N2 (about 0.05 MPa), and start the fan, the gas flow through the heater to workpiece, the formation of convection heating, in order to ensure the uniformity of heating workpiece, at the same time, improve heating efficiency.
  Gas circulation second measures is set up in the back of my furnace cooling fan, cooling the recharge N2 of 0.12 ~ 0.13 MPa, can join a proportion of H2, when necessary to prevent oxidation, cooling gas through the heat ex-changer and the wind deflector, forced convection flow artifacts formation circulation cooling, because the cooling speed increases, helps to avoid some of the steel tempering brittleness, shorten the production cycle, improve the productivity.

Vacuum high-pressure gas quenching furnace

Vacuum high-pressure gas quenching furnace

Usage:
It is mainly used for high speed steel, die steel, stainless steel quenching; Stainless steel and titanium alloy solid solution treatment; Magnetic Material of vacuum heat treatment and high temperature brazing and vacuum sintering. Add convection fan can also be to low temperature tempering.
Structure features:
Heating chamber adopts stainless steel skeleton, new carbon felt composite material, less deformation, resistance to high temperature and high pressure air flow Washing, long service life, easy maintenance. Using graphite tube heater, easy installation and maintenance, low failure rate. Air cooled by jet cooling way, graphite nozzle circumference uniformly distributed, make high pressure air flow more reasonable (part of the main duct air volume size adjustable, customers can according to the characteristics of the artifacts the size of the control part of the main duct airflow), can effectively control the workpiece deformation. High speed and high pressure large flow fan, copper, copper efficient circular heat exchanger, achieve rapid cooling. Fan can use single speed, double speed, frequency control of motor speed in a variety of ways, air cooling speed control. Heating chamber can also adopts full metal structure, in order to satisfy the requirement of the titanium alloy, precision alloy solid solution treatment. Electric control system adopts PLC and programmable temperature controller, realize fully automatic, semi-automatic and manual control modes of three, flexible operation.