To maintain vibrating feeder is of great signality
In vibrating feeder, the hopper scoop the materials sent in from the feed inlet by its own. If the location of the feed inlet is too low, most of the materials will enter in to the engine base before the hopper could scoop the materials, resulting in the failure of hopper scooping materials. Thus the materials will easily become a massive, and then cause deformation and detachment of the hopper. When this phenomenon occurs, workers should adjust the location of the feed inlet. In addition they can also change the materials of the hopper, and select high-quality materials to make the hopper. The usually seen hoppers are made of ordinary steel or galvanized sheet metal welding, folding or involving in the lead wire to enhance the strength of the hopper. As the load components of the vibrating feeder, the hopper requires relatively higher for the materials, so the installation should try to use higher strength material.
Before starting the machine, workers must clear the accumulated materials within the base, otherwise it would cause the phenomenon of downtime. If workers start the machine after outage or downtime, without clearing the accumulated materials, the hopper would probably rapture or fall off. Therefore between shutdown and boot, it is essential to clear the accumulating material within the base. In addition, the connection the hopper and the hopper tie should also be regularly checked to make sure its firmness. Once finding the problem, regardless it is screws loosening and fall off or hopper skew and damage, it should be promptly repaired or replaced, as a preventive measure. Hopper tear should also be avoided in hopper operations, which would be caused by deviation of the hopper tie and detachment of the hopper. If workers discover this phenomenon, they must timely rind out the reason and remedy of the trouble. Moreover, the materials mixed with the foreign body of sharp edges should be avoided, because they could possibly crack the hopper tie. Therefore, during production process, the vibrating feeder should be installed mounted steel mesh or magnet on the feed inlet to avoid large piece of foreign matter falling into the base.
The maintenance and repair work of construction machinery is generally in the construction trimming and intermittent periods. Before the official starting of the maintenance work, the workers must understand the service condition and mechanical problems of the machine, so as to achieve the right judgment. The maintenance work must have focus and truly eliminate all kinds of failures. In the process of repair and maintenance, workers should work meticulously and do not miss a single problem. Try to resolve all the problems in the maintenance phase to reduce the loss of production caused by the machinery accident.
Concentrator operates easily and uses widely
Concentration is a process by means of gravity centrifugal force or physical and chemical effects of pharmaceutical to realize agglutination of solid particles in suspension, thereby enhancing the solid phase concentration in suspension. This process is widely used in the concentration process of ferrous metals, nonferrous metals, rare metals and non-metallic, after crushing operation of mobile crusher. Nowadays, the main equipment to achieve this process is concentrator. Due to its easy operation and relatively low maintenance costs, it is widely used in various industrial sectors. In the mineral processing equipment, concentrator is mainly used for the concentrate product concentration, tailings recycled water handling as well as dehydration condensed of intermediate products.
There are now many types and specifications of concentrator. Generally speaking, according to the structural features, they can be divided into the traction thickener and Center Drive Thickener, or divided into single-layer concentrator and multi-layer concentrator. traction thickener, in accordance with its structure, can be divided into the peripheral rack drive, surrounding roller transmission drive and surrounding rubber tire drive etc. The materials of concentrated pools are steel pull system, wood or concrete.
Currently the concentrator home and abroad is basically in a stable stage, and the development and improvement are not significant. The concentrators used in the mineral processing plant are major of center-drive, because of their reliable operation. Some mineral processing plant add inclined plate in the small and medium-sized concentrator, in order to improve the processing capability of unit area. Moreover, the multilayer (3-5 layers) concentrator is researched in order to reduce floor space. Many countries have produced complete series and more specifications. According to the structural features, they can be divided into several types:
(1) Center shaft driving inspissation concentrator: generally the small diameter concentrator is with such a structure. Its special cylinder leaves the rake frame rotating through the center of rotation axis. The diameter of such concentrator is generally no more than 20 to 25 meters.
(2) Center drive concentrator: structural features of this kind of concentrator is that in the center of the concentrated pool there are reinforced concrete columns above the surface, so as to support the machine, Center Drive drives harrow frame to rotate. The diameter of this type of concentrator is not too large, usually about 20 meters, but the maximum can reach 50 meters or more.
Ball mill power determines beneficiation fineness
In order to understand the power of the ball mill, power transmitter should be installed to measure powers. The flow of the second magnetic slurry of pulp distributor enters into the secondary magnetic separator for second magnetic separation, then the qualified slurry is sent into three graded slurry distributor by pipeline preparing for third classification and the failed pulp is sent to the tail ore concentrating pool.
Third cyclone classification group sets up liquid indicator to the pump mine pool to detect the level of the pump pool pulp, and regulates the water supply valve on the pump pool fill water pipes according to the detected level, so that the mine pump pool slurry level could remain relatively stable. And classification in the three cyclone group to the mine pump pool fill pipes installed on the pressure transmitters and water flow meters to complete the testing and monitoring of the supply water pressure and flow. Transmitter in the three classification cyclone group was installed on the way to the mine management, slurry flow meter, the meter of slurry concentration complete the slurry pressure, flow rate, concentration detection and monitoring. Cyclone through frequency change to the mine pump speed in order to change to the mine pressure, to achieve automatic control of hydrocyclone group. The same in order to understand the effects of three graded set in the third grade flow group overflow mouth-line particle size analyzer to detect the overflow particle size, detected data to analyze the quality of the grinding circuit products Cyclone group, and accordingly adjust the three grading ore concentration or pressure, so that granularity meet expectations. Three classification after the cyclone overflow into the three magnetic slurry distributor, bottom currents return to stand mill for regrinding. Mill stand again the grinding process products re given away three classification cyclone group to the mine pump pool re-grading.
The flow of the third magnetic slurry of pulp distributor enters into the third magnetic separator for second magnetic separation, then the qualified slurry is sent into three graded slurry distributor by pipeline preparing for third classification and the failed pulp is sent to the tail ore concentrating pool. In addition, semi-autogenous mill and ball mill manufacturer provides a set of instrumentation to assure the control and performance monitoring of the lubrication system of the mill and associated equipment, so as to ensure safe and reliable operation of the mill.
Fruitful research of grinding media in China
The research of grinding media in China started in 1981, which was later than the developed countries for more than 20 years. Before 1981, China was influenced by the former Soviet Union, main large state-owned enterprises adopted the rolling ball in the maximum number. There were three typical representatives: the Anshan Iron and Steel rolling ball machine No.1, Benxi Iron and Steel Company rolling ball machine No.1, Handan Iron and Steel Company rolling ball machine No.1, all of which served for the iron ore concentrator production.
From mid-1980s to the mid-1990s, the research, production and application of the grinding media are fruitful. It can be summed up in the following areas. Most of large and medium-sized iron ore concentrators have been started to use high-carbon steel grinding balls or low alloy steel quenching forging ball or rolling ball, instead of the ordinary low-carbon steel grinding balls
(1) the high-carbon steel forging waste heat quenching steel ball. The Angang Donganshan sintering plant promotes the φ127 mm high-carbon steel forging waste heat quenching steel ball in paragraph φ3200 mm × 3100 mm - lattice-type ball mill, and in 3 years accumulatively saves balls for 650t, saving more than 33% consumption than the original low-carbon steel ball, increasing the Wear-resisting multiples 1.5 and the total save ball effective is 5.25 million yuan /a according to planning price. The grinding process has stopped to use low-carbon steel balls. Angang mining company promotes ¢60 mm high-carbon steel forging waste heat quenching steel ball in Donganshan sintering plant, Dagushan, Qidashan concentrator, whose unit consumption is 35% ~ 40% lower than the low-carbon steel balls.
(2) the mid-carbon and low chromium forging waste heat quenching steel ball. Luzhong metallurgical and mining company ore dressing plant promotes φIOO mm mid-carbon and low chromium forging waste heat quenching steel ball in the low carbon chrome forging concentrator φ2700 mm x 3600 mm sec lattice-type ball mill, whose consumption reduces from 0.817 kg / t of the original low-carbon steel ball of to 0 347 kg/t, saving consumption 57%, saving grinding balls costs$ 039 per ton of ore. If the total annual ore processing if 1.26 million tons, the saving balls per year will be 592 t and saving efficiency will be 255 million.
(3) high-carbon and low-alloy steel forging waste heat quenching steel ball. 4100 mm high-carbon and low-alloy steel forging waste heat quenching steel ball researched by Shandong Metallurgical Design and Research Institute is tested and applied in the Laiwu Iron Concentrator 42700 mm x 2100 mm ball mill industry, in which the ball consumption of the manganese cast iron reduces from 0 95 kg/t to 0 348 kg / t, saving consumption 63%, multiples wear-resistance 2.7. If the raw ore processing per year is 30 000 t, the saving ball per year will be 200 t.
Maintenance of engine base and mid-stander mouth
After years of use, the engine base and the middle rack mouth of gyratory mobile crusher would probably be seriously worn and torn. The actual size would be largely different from the design size, resulting in the powerful shaking of central rack, resulting in the rapture of the dowel in engine base and middle rack mouth links, or even the dowel hole would be torn into oval. The maintenance methods of engine base and mid-stander mouth are as follows:
1. to mark with vertical bar (2580 circumference can be of eight parts) in the links of engine base and mid-stander mouth, and then mark in order to prepare the alignment and measurement with the original position during installation.
2. to hang the central rack, and to measure and record the actual size of the bottom edge of the base mouth with the wild card (homemade) or box tape.
3. to measure the actual size of the bottom edge of the central rack mouth and then record.
4. to get the thickness of the needed steel plate at the same location of the engine base mouth. Considering the concentricity of central rack mouth size and the engine base mouth size, the whole needed thickness of the steel plate should be in half placement. In addition, the specification of each piece of iron is: if the height of the mouth is 85mm, the width of each iron could be 80mm, and the length is of 100-200mm.
5. to hammer the above 8 iron plates (materials from the Q235, or 45 steel) into arc-shaped with a sledgehammer, paste on the engine base mouth (both radius should be consistent), and then welding.
6. to adjust and install the central rack with above-mentioned methods.
Design drawings ensure hardness of the accessories
As for the accessories like taper sleeve and bearing pad ring in mobile crusher, the designers must base on the design drawings to ensure their hardness and the hardness difference between them. Because of the particular importance of the suspension, it needs not only regular maintenance, but also maintenance during production gaps at any time. The screw is used to separate the nuts and coat, so should be painted with the oil custody after maintenance. The nut should be firmly fixed to the spindle key. The suspension system should be lubricated with clean grease after maintenance. During operating process, the crusher should be with regular lubrication.
The liner of the crusher contacts directly with the ore, so it wears the most and should be replaced timely. When the whole thickness of the liner is worn two-thirds or the mill leakage ruptures, or the dischange setting is too big to be adjusted, the fixed and movable cone liner must be replaced. According to the wear and tear and rupture condition, the replacing range can be divided generally into the following situations: 1. Fixed and movable cone liner are replaced at the same time. 2. To change the fixed cone liner or movable cone liner. 3. To only replace the two lower cone liners. 4. To only replace one of the lower liner of the cone liner. 5. To only replace parts of the liner.
Crusher installation must have a solid foundation
Gyratory mobile crusher should be installed on a solid foundation, and the basis should have sufficient discharge space, not allowing ore deposited on the moving cone, because of all the differences in terrain conditions around the crusher infrastructure in the form. Strength and size are determined according to the actual situation. Install or repair the broken machine must be equipped with appropriate lifting equipment. The lifting equipment should be based on the weight of the largest components in the gyratory crusher used to select.
In the the pre-installation, the, the crushing machine shall on the In addition to the all of the net parts processing table dust and Protective Coatings, the Elimination of new generated by in the transport process - cut defects of. Installation parts all contacts must be coated with oil (except for lining). Fixed surface coated with dry oil activities coated with a thin oil, and protection of the friction surface, and not allow dust and dirt falls above in mind when installing. Can not be used to clean oil and cotton yarn, where they get dirty easily use the fat guard and a clean canvas cover. Installation in accordance with the technical requirements on the general layout and component diagrams.
The base unit is the lower part of the rack. The first installation base mounted on the base so that the centerline coincident with the Technology Center to find usually placed on a level surface in the center hole in the top of the base plus, flat feet, and its level of tolerance of 0.1mm / m. Between the base of the base surface and foundation, you want to keep a gap greater than 30mm, so that once the grout and metal wedge carefully to find. When the grout layer is solidified, and then removed from under the surface of the base to adjust the metal wedge gap fill up with cement, and finally re-tighten the anchor bolts.
In addition, all the drive shaft of the mine equipment is installed, it should be noted that the two copper centers should be on the same level. The radial clearance between the copper sleeve and the drive shaft should be within the range of (0.0025 to 0.003) D, D is the diameter of the drive shaft. Fixed retaining ring to keep the drive shaft axial string momentum of 0.3 ~ 0.8mm lateral independent bearing and should be a certain distance between the basis, usually around 30mm, so that once the grout. Install the drive shaft, between the flange and the base unit of the drive shaft shell to add the right amount of adjustment shims. In order to adjust the position of the bevel gear and use the model to examine the difference between them in line with the requirements of product design. If the drive shaft housing from the base to remove. Three screws that can turn a transmission housing.
Grinding technology optimization cuts investment
In the process of actual operation and research experiments, ball mill grinding system technology gets further optimization. The optimization of technology in the production process is on the basis of a combination of many factors of particle size, temperature, admixture types, the equilibrium theory for the technical principle, by the length of the twelve positions on the mill, as well as mill ventilation material ability to strengthen and promote the efficiency of the entire mill system upgrade. Capital investment of the technological transformation efficiency significantly. Even the raw materials into the ground water up to 3.5% yield any riding in the closed-circuit raw mill modified contingent can get higher yields. A 7m ф2.2 * raw mill, for example, the transformation fund a minimum of a few thousand dollars can transform time are generally not more than 24 hours under the same conditions, the output of each device can be improved from 20 to 80 percent.
In addition to the use of solid volume principle, and laminate theory, and through careful study of the broken nature of the materials, particle size can be achieved to optimize the design of the crusher jaw. After the optimization and upgrading of the new jaw crusher features: Since the material into the crushing chamber will be squeezed, run to the bottom of the crushing chamber will be a certain distance parallel to the extrusion. The number of such materials in the crushing cavity by squeezing the number of extruded several times more than ordinary crusher, thus crushing efficiency greatly improved. This optimization method for jaw crusher, just to transform the jaw, so the transformation of the lower cost. Transformation of the time only need 3 to 4 hours, is the best choice of the cement plants and other manufacturing facilities.
At present, the domestic part of the screening grinding the sieve plate aperture small, narrow through the material surface, and caused by loose material from the sieve Coarse, grate grate sew plug weaknesses in the actual operation of the process. The existence of these phenomena has led to increased yields slow fluctuations in the quality is too large, serious and even through the downtime to deal with the sieve plate failure, to produce huge losses. After a long grinding commonly used screening analysis and research, the latest development within the powder screening mill technology, this technology brings together the essence of the many outstanding milling technology, and made significant improvements for these shortcomings. The technology integrated material properties, particle size and other factors, on the basis of the original grinding process force, science operations by using the new screening device in a ball mill to achieve the desired goal of efficient production.
Mineral granularity is pivotal for magnetic separator
The ore particle size for magnetic separator is an important factor that cannot be ignored in magnetic separation process, because most the effect of magnetic separator is determined by it. To the degree of the thickness of the ore particle size reflects the size of the ore monomer separation is two kinds of magnetic particles of mineral particles and gangue mineral particles of the degree of segregation. The small particle size of ore mineral separation of monomer is high, can achieve better sorting index, on the contrary relativeasly coarse granularity, on behalf of the mineral has not been fully dissociation, monomer separation is not high, that is produced more with the body. Even the living body has a larger magnetic impact, in large measure a magnetic effect. Must be fully separated mineral monomer into the magnetic separator magnetic separator operating a very important standard. Disseminated coarse-grained ore, does not necessarily require a size too small, as long as the mineral monomer are fully separated to. This size of ore, although crude, but the sorting is not low quality, the main reason ore disseminated coarse granularity, after a certain degree of grinding, we need useful minerals and gangue separated.
The highest magnetic field strength measured data is 8000mT, while the latest magnetic separator magnetic system using the latest high-quality composite materials, and greatly improve the original tube-like appearance to roll like a magnetic field strength. The magnetic separator is applicable in many fields, such as to remove the iron, resource recovery, also applies to the particle size 3mm magnetite, pyrrhotite, magnetic separation operations. The iron removal operation of the coal, non-metallic minerals, building materials and other materials, of course, evident. Wonder known as the world's most widely used generic super performance machine one. Magnetic separation technology is the main method of the physical beneficiation technology, but also enriched in iron minerals is the most economical and effective method one of the parties.
In accordance with the principle of enrichment and separation of magnetic iron minerals: the separation of magnetic minerals and non-magnetic minerals depending on the price of iron minerals and gangue mineral by the magnetic effect of the difference. To make effective use of this principle must be through the process mineralogy studies to fully grasp the basic nature of the various types of ore minerals, the study consists of: mineral content and phase than the susceptibility determination, the price of mineral monomer separation and harmful minerals associated status. The use of magnetic separation equipment, attention to the magnetic field strength is an important aspect of the most important thing to a single degree of separation into the minerals, so these two aspects in the operation must take into account, so that you can achieve the forecast to reach the theoretical value indicators and business indicators
Rational allocation of Raymond increases productivity
With the continuous development of the industry, Raymond ball mill, as the main equipment of grinding powder industry, its development of high efficient, stable, low-power, precision and automation has become an inevitable trend. Throughout mill crushing the field, improved crushing, grinding operation process, improve the existing equipment configuration structure, equipment operation data of information technology to simplify the upgrade process, a consensus has been reached in the industry and the development of most businesses struggle goals. The long production practice, and take the development of big crushing ratio, high efficiency, low consumption of new crushing equipment road gradually be respected to achieve this goal is the most effective, most economical and reasonable way.
Experts generally believe that Raymond Mill powder industry efficiency and low consumption, automated direction has been very clear. Real-time, on the job site through the use of condition monitoring, and microcomputer automatic control device to achieve effective management. Stability to achieve the rationalization of mechanical principles to study the wear resistance of the various accessories to improve the lubrication of continuous work between the machine bearings. Raymond inside the intelligent electronic control system and out of the automatic control of materials, grinding, and quantitative and other intelligent equipment operation data of the set goals. In order to achieve the goal of high efficiency and low consumption, and technical staff through the crushing and grinding energy consumption and utilization of research analysis and comparison of design now strongly advocated more crushing mill "the new process, that is, by reducing the fragmentation products the final product particle size, increase the content of the product of the level of fine-grained level in the fragmentation products, greatly improve the handling capacity of the mill, to reduce fragmentation, reduce costs, and technology to enhance the goal of the enterprise market competitiveness.
In the past, the production, milling equipment gap change is a vexing problem, and improved device gap adjustment can be mechanical or hydraulic adjustment to achieve, the use of the hydraulic adjustment system is through the local operating buttons or remote controls system to complete the adjustment of the gap, so that improved wear wearing parts than high pressure mill reduces the metal utilization, the original appears on both sides of the plate hammer of wear to the mere presence in the Looking material. Such board hammer back and sides are not being worn, greatly reducing the board hammer wear. Part of the bottom of the grinding becomes more easy to replace a series of design improvements to the board hammer metal mill utilization can be as high as 45% -48%, matured now see the structural design of milling equipment, industry production provides strong technical support of equipment.