2015年4月9日星期四

Cement production motivates the rotary kiln development

Xinguang Machinery is one of the leading manufacturers in producing high efficiency and energy-saving mining machinery in Henan Province, China. We mainly provide ball mills, rotary kilns , Vertical combination crusher , magnetic separators, floatation machines, pelletizers, vibrating feeders, vibrating screens, sand-washing machines, belt conveyors and driers.

Xinguang Machinery is the rotary kiln manufacturer, whihch is professional design and manufacturing of cement kiln,rotary kiln technology and whole sets of equipment, to provide free consulting for all the clients, installation debugging and other services,do the turn-key project,Great Wall company can meet the production line investment needs of the customers at home and abroad.
Rotary kiln application is originated from cement production,Enterprises get considerable economic benefit after rotary kiln put into production.The invention of the rotary kiln makes cement industry rapid development,and also promote the research on the application of the rotary kiln. rotary kiln is widely used in many industrial fields quickly, and rotary kiln plays more and more important role in the production,rotary kiln has become the core equipment of the enterprise.The quality,capacity and cost of enterprise has close relationship with rotary kiln technical performance and operation situation. As rotary kiln operation technology and the development of active lime calcination process and needs, how to further improve and perfect and unified understanding of rotary kiln operation knowledge, and achieve combination of theory and practice,which is still vitical in active quicklime calcination

ROTARY KILN STRUCTURE INTRODUCTION AND OPE

ON PROCES

Operation process of rotary kiln,the main drive motor gives power to the open gear device through the main reducer,and then drives the rotary kiln operation.Materials enter into kiln tail doe calcination,As a result of rotary kiln cylinder slope and rotary kiln ortation,the materials are rotated along the circumferential direction and along the axial direction (from high-end to low-end), After the complete decomposition and calcination process, finally,the produced clinker are cooled by cooling machine through the kiln head cover into the cooling machine.Fuel from the kiln head spray into the rotary kiln, in which waste air and clinker do the heat exchange,and then exhaust air from the kiln tial

2015年4月8日星期三

The working principle and structure characteristics of rotary kiln

rotary kiln

Raw material is entered from high-end of kiln tail shell to the inner kiln shell for calcination. The inclination and slow rotation of kiln shell makes material roll along circumferential direction and along axial direction from high end to low end. Through decomposition, calcination, cooling and other technical process, the raw material is burnt to cement clinker and then discharged from the low end of kiln shell and entered cooler.

The fuel is puffed from kiln head, burnt inside the kiln, and the heat giving out is used to heat the raw material, to make the raw material calcine to clinker. The hot air formed during the process of material heating exchange is entered from kiln feeding end to kiln tail system, and then vent the gas by chimney.

2．Structural features

The rotary kiln is mainly consist of kiln shell, driving device, supporting device, thrust roller device, kiln head sealing device, kiln tail sealing device, kiln hood and so on. Please refer to structural diagram of rotary kiln.

(1)Kiln shell part

Kiln shell is the main body of rotary kiln, and it is rolled and welded by steel plate. Kiln tail is obliquely installed many pairs of supporting rollers. The lower end of the kiln shell is equipped with high temperature and abrasion resistant kilneye guard plate and form sleeve space, and there is also air fan to cool for kilneye part. Several rectangle tyres have been set along the direction of kiln shell length, which bears the weight of kiln shell, kiln liner, material and other rotate parts, and spreads its weight to supporting device. There’s floating washer under the tyre, you can adjust or change it according to the clearance after operation, to gain the best clearance. The washer is used to enhance the rigidity of kiln shell, to avoid kiln shell suffering abrasion due to relative sliding between tyre and kiln shell along circumferencial direction

(2) bull gear device

Bull gear is fixed near the end part of kiln shell to transmit torque. The bull gear is connected with kiln shell by spring plate, because this connecting structure can make enough heat dissipation space between gear ring and kiln shell, and can also reduce kiln shell bending deflection, besides it can damping and buffer, which is good to prolong the life of kiln liner.

(3) driving device 3.1 driving mode：

a) Single drive：The driving system adopts single drive, and it is driven by a set of main driving motor.

b) Double drive：The driving system adopts double drive, and they are driven two sets of main driving motor. Two sets of transmission of the synchronization are achieved by adjusting the electrical equipment, so two systems can bear even stress. c) 3.2 motor

Except the small-scale rotary kiln can select Z2 series small-scale DC motor, the others all select ZSN4 DC motor - specialized for rotary kiln. ZSN4 DC motor is designed as per cement rotary kiln main drive working condition, with small size, light weight, high efficiency, and good performance. 3.3 Reducer

It often selects hardened tooth-surface reducer for the reducer, because it has advanced technology, small size and light weight. 3.4 Assembled spring coupler

Assembled spring coupler is used between pinion device and main reducer, because it has good flexibility, can absorb some impact and can also compensate for the larger radial deviation and axial stretch.

(4) Supporting device

Supporting device is an important part of rotary kiln. It carries the whole weight of the rotating part of kiln shell, and has the positioning function on shell to make shell and supporting roller rotate stably. Supporting device is Self-aligning sliding bearings structure, with compact structure and light weight. It also configured lubricating oil automatic heating and temperature control devices and measuring devices, which is reliable and adaptable.(5)thrust roller device

According to the stress condition and action principle of thrust roller, it is divided into mechanical signal thrust roller and hydraulic thrust roller.

a) Mechanical thrust roller: it is installed in pairs on the two sides of tyre near bull gear, to restrict kiln shell movement in axial direction.

b) Hydraulic thrust roller：it is set on lower side of tyre near bull gear. Trust roller is to force tyre and kiln shell reciprocate in certain speed and stroke along kiln centerline direction on the supporting roller, which can make the tyre and supporting roller wear evenly on the whole width to prolong lifetime.（6） kiln head sealing device

Kiln head sealing device is the SM-type kiln head sealing device or the GP-type kiln head sealing device, which can meet the working condition and the user’s requirements. a) SM-type kiln head sealing device SM graphite is block radial contact and labyrinth assembly sealing mode. It can compensate runout during kiln shell operation automatically, and it has good sealing performance.

b) GP-type kiln head sealing device is steel sheet radial contact sealing mode. It can compensate runout during kiln shell operation automatically, and it has good sealing performance.

(7) kiln tail sealing device

a) QD-type kiln tail sealing device adopts cylinder compress endface contact, and the whole sealing rings can bear the even stress and eliminate harmful effect caused by installation and kiln shell flexivity. Besides, lubricating grease is fed into friction ring contact surface to lubricate by electrical dry oil pump, with little friction, little abrasion and good sealing.(8) kiln hood

Kiln hood is welded by steel plate. It is located on kiln head operation platform by the supporting legs on the two sides. Its lower part is connected with cooler. Inside the kiln hood, there should be firebrick or heat resistant concrete. Two suspension movable kiln door are set at outer endface of kiln hood, so as to easily get into kiln for repairing and building kiln liner

2015年4月7日星期二

Rotary kiln and its working principle

Rotary kiln

Rotary kiln, also called cement rotary kiln and lime rotary kiln, belongs to the class of building material equipment.

Rotary kiln can be divided into cement rotary kiln, calcinating rotary kiln and circumgyrate kiln according to different processing materials.

Rotary kiln equipment is mainly used for calcining cement clinker, with dry process production and wet process production two kinds.

Calcinating rotary kiln is mainly used to roast lean iron ore magnetization, chromium and nickel iron for metallurgical industry, to calcining alumina bauxite ore for refractory plant, to calcine clinker and aluminum hydroxide for aluminum manufacturer, to roast chromium ore mineral powder for chemical plants, etc.

Circumgyrate kiln is used to roast active lime and calcined dolomite for roasting plant and ferroalloy plant.

The calcination technology of rotary kiln has low energy consumption, stable performance and high yield; after going through processes of dehydration, decarburization, whitening, etc., its product can be used in papermaking industry, coating industry, etc.

Brief introduction to lime rotary kiln

Lime kiln, also known as lime rotary kiln or lime pit, belongs to rotary kiln; it is main equipment to calcine active lime, composed of cylinder body, support device, bearing device with hydraulic gear wheel, transmission device, lubrication device and sealing device, with simple structure, reliable operation and convenient automatic control.

Performance characteristics of horizontal lime kiln

The horizontal kiln has advanced structure; it adopts reliable combined-type

scales seal on both ends of the machine, so that the air leakage coefficient is less than 10%; kiln lining uses composite refractory, reducing radiation heat loss; in addition, horizontal lime kiln makes full use of waste heat, which can preheat secondary air into the kiln to 700 ℃ or above, saving energy greatly.

Working principle of limestone rotary kiln

Pulverized coal produces heat in the furnace, then the heat is conducted to materials through gas or radiation; at the same time, kiln body keeps turning according to the design of slope and speed, and raw materials also periodically roll forward in the stove so that they can be sent to discharging end from feeding end.

Hongxing company is always committed to the improvement of limestone rotary kiln. We will try our best to make progress in the performance of lime rotary kiln!

2015年4月3日星期五

vertical-combination-crusher-in-cement-production-line

Vertical combination crusher is a new type of fine crushing and rough milling product after optimizing and designing the main technical parameter and combining the domestic and international crushing technologies. Vertical combination crusher is also applicable for crushing iron ore, sandstone, gypsum, blast furnace residue, coal stone, piece coal, and many other ores of medium hardness.

Material falls the feed hopper, then enters the high-speed rotary sling wheel from center feeding hole, which is speeded immediately in the sling wheel. The speed can reach several dozens times of the gravity acceleration. Then vertical combination crusher is thrown from the sling wheel. First, it is crushed with other rebounded material fell freely from the sling wheel. Then both of them are impacted to the material lining (rock-rock) or strike back block (rock-iron), rebounded and stroke to the top of eddy cavity of vertical combination crusher in the inclined-up direction. Then it moves along deflection-down, and forms a continuous material curtain with the material from the impellers passage. Just like this, the material is stroke, rubbed, crushed twice or more, then is discharged from the down discharging hole.

Vertical combination crusher is mainly used to crush crude cement materials and grogs in medium–sized factory, providing an ideal fine crushing equipment for the technological innovation of cement factories or setting up the cement production line.

Xinguang adopts imported material and advanced techniques for our product manufacturing. We expect your choice and prepare to provide you with heartfelt service at any time. Welcome to visit our factory.

2015年4月2日星期四

Rod Mill Compared with Ball Mill

Rod Mill

Rod mill is very similar to ball mill, except it uses long steel rods with a diameter of 50-100mm as grinding media. The rods grind the ore by tumbling within the the mill, similar to the grinding balls in a ball mill.

Rod mill is composed by the cylinder part, feeding part, discharging part, main bearing part and driving part, which is similar with ball mill.

Rod mill is widely used grinding mill to grind all kinds of ore and rocks in metal and nonmetal mining, water conservation, building materials,sand making industry and so on. It grinds ore into coarse size.The output could be 0.3mm-2mm. It often worked in first-stage grinding before ball mill.

Rod mill is mainly used for processing or crushing the feldspar, quartz, minerals and other raw materials, and it is also suitable for finely or secondarily crushing the various tough or brittle materials, such as grinding material, refractory material, cement, steel shot, pulverized slag, Copper Ore, iron ore, gold ore, concrete aggregate,
bituminized aggregate.

High Weir Type & Immersed Weir Type Spiral Classifier

Spiral Classifier

Spiral classifier is mechanical grading equipment which works based on the different proportion of solid particles with different sedimentation rate in the liquid. Fine mineral particles floating in the water to overflow while the coarse mineral particles sink to the bottom, then pushed out by the screw to the ball mill feed mouth, thus filter out the fine material discharged from the overflow tube.

According to the height of the surface of the liquid classification, the machines can be divided into high weir type and immersed weir type.

The overflow weir of the high weir type spiral classifier is higher than the center of the spiral axle at the bottom and lower than the top of the spiral blades. As the surface of the liquid classification is not very long, the liquid surface can feel the mixing of the spiral blades, and then this kind of machine can be used for the classification of coarse particles, whose classification granule is more than 0.15MM. The whole spiral blades of the immersed weir type are immersed in the flooding level, the area of the classification is large and stable, which is suitable for the classification of the fine particles, the classification granule of which is less than 0.15mm. It has high productivity.

Besides, there is one kind of low weir type of spiral classifier, whose surface of the liquid classification is lower than the spiral bearing. The area of the liquid surface is small, but the machine can mix strongly. It is mainly used in the washing of the ores with mud.

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E-mail/ info@ballmillxg.com

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