WO2021093255A1 - 一种外循环辊式立磨 - Google Patents

一种外循环辊式立磨 Download PDF

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Publication number
WO2021093255A1
WO2021093255A1 PCT/CN2020/082621 CN2020082621W WO2021093255A1 WO 2021093255 A1 WO2021093255 A1 WO 2021093255A1 CN 2020082621 W CN2020082621 W CN 2020082621W WO 2021093255 A1 WO2021093255 A1 WO 2021093255A1
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powder
grinding
external circulation
cylinder
vertical mill
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PCT/CN2020/082621
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English (en)
French (fr)
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张桂才
刘子河
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南京钜力智能制造技术研究院有限公司
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Publication of WO2021093255A1 publication Critical patent/WO2021093255A1/zh

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/007Mills with rollers pressed against a rotary horizontal disc
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/20Adding fluid, other than for crushing or disintegrating by fluid energy after crushing or disintegrating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C2015/002Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs combined with a classifier

Definitions

  • the invention relates to a material bed grinding equipment, in particular to an external circulation roller type vertical mill.
  • the equipment for these grinding operations is the grinding equipment.
  • common grinding equipments include tube mills, roller presses and roller vertical mills. Because the roller press and the roller vertical mill belong to the material layer grinding equipment, their grinding efficiency is higher than that of the tube mill, so they have reached a wide range of applications in the grinding operation.
  • Roller vertical mill is a kind of grinding machine that uses the principle of material layer grinding to grind materials. It has been widely used in cement, coal, electric power, metallurgy, mineral processing and other industries. At present, the common vertical mill is a full-air-swept mill. The material is crushed by the relative movement of the grinding roller and the grinding disc, and the ground material is dried by hot air and carried upward into the powder concentrator. It is classified in the mill, and the coarse powder falls on the grinding disc to be smashed again; the finished product is sent out of the mill by air flow and collected by the dust collector. Specific process: After the material is squeezed, as the grinding disc rotates, the material falls from the edge of the grinding disc to the nozzle ring under the action of centrifugal force.
  • the high-speed swirling wind blows and blows away, and the metal and heavy ore will settle. Discharge under the spout ring.
  • the fine powder is brought to the upper part of the vertical mill and is sorted by the powder separator.
  • the finished product enters the dust collector along with the gas and is collected.
  • the sorted coarse particles fall into the grinding disc and grind again, and the high-speed swirling wind at the nozzle ring throws those coarse particles up, and as the wind speed decreases during the ascent process, they gradually lose support and settle on the grinding disc. , Relying on centrifugal force to enter the rolling area of the grinding roller and the grinding disc again for rolling and grinding.
  • heat transfer between the particles and the gas causes the moisture to evaporate.
  • the vertical mill is composed of six parts: the casing and the base, the grinding roller and the grinding disc, the pressure device, the grading device, the transmission device and the lubrication system.
  • Roller type vertical mill is a kind of full air swept mill.
  • the material ground between the grinding roller and the grinding disc is blown and dispersed by high-speed gas at the nozzle ring, and then lifted upwards.
  • the coarser particles are When it is lifted and blown upwards, due to its gravity, it is affected by the bottom-up high-speed airflow during the falling process.
  • Some materials are always in a suspended state, and some materials fall onto the grinding disc during the lifting process, and then fall from the edge of the grinding disc.
  • the airflow at the nozzle ring blows up, so a large amount of internal circulation is formed, which causes the internal dust concentration to be too high, which will cause the airflow resistance to move upwards.
  • the wind speed at the nozzle ring is higher, and its resistance is also Higher, the overall pressure difference of the vertical mill is generally higher, generally between 7000-10000Pa.
  • the use of air force to bring a large amount of materials from the bottom up requires a lot of energy consumption, which directly increases the energy consumption. The rise.
  • the finer materials in the mill are brought up by the gas and enter the classifier for classification.
  • the coarser powders that are separated fall into the inner ash hopper and enter the grinding disc for re-grinding.
  • the powder (finished product) enters the subsequent dust collector with the gas for gas-solid separation.
  • the purpose of the present invention is to overcome the above-mentioned problems and provide an external circulation roller vertical mill.
  • the method adopted by the present invention is: an external circulation roller vertical mill, comprising a mill shell, a grinding disc and a grinding roller are arranged in the mill shell, and a grinding roller is arranged on the upper part of the mill shell.
  • a partition plate is arranged in the middle and upper part of the mill shell to divide the mill shell into a grinding cylinder and a powder separator; the powder separator is arranged in the powder separator, and the powder separator is arranged in the powder separator.
  • the outlet of the coarse powder ash hopper of the machine passes through the partition plate and extends into the grinding cylinder.
  • the lower part of the powder separator is provided with an air inlet; the grinding disc and the grinding roller are arranged at
  • the lower part of the grinding cylinder is provided with a spout ring between the outer circumference of the grinding disc and the mill shell, and a discharge ring is provided at the lower part of the spout ring, and a discharge ring is also provided at the bottom of the discharge ring.
  • the material opening is also provided with a material lifting mechanism at the discharge opening. The material lifting mechanism sends the material to the powder separator in the powder separator cylinder and is connected with the feed pipe of the powder separator.
  • an air lock flap valve is installed under the partition plate, which is used to discharge the possible accumulation of material at the air inlet of the partition plate into the grinding cylinder.
  • a scraper is installed around the grinding disc, and the scraper scrapes the material to the discharge port at the lower part, thereby discharging the material from the mill.
  • the grinding disc is installed on the reducer, and the main motor provides power to the reducer.
  • the rotating cage inside the powder separator is connected to the reducer of the powder separator through the main shaft assembly, the reducer is driven by the main shaft drive motor, and the transmission device is installed on the upper cylinder.
  • a sealing mechanism is arranged on the upper part of the rotating cage to separate the materials entering the sprinkling tray in the powder concentrator from the inside of the rotating cage.
  • the grinding rollers are arranged on the shaft seat support through a rocker arm, and are equally divided and evenly distributed on the periphery of the mill shell.
  • the rocker arm is also connected with a hydraulic cylinder, and the hydraulic cylinder exerts a force on the grinding roller.
  • the outlet of the coarse powder ash hopper corresponds to the center of the grinding disc.
  • the invention separates the mill from the powder separator by setting a partition plate, and the above powder separator forms an independent system, but is located on the upper part of the mill body, so that the coarse materials after powder selection can directly enter the grinding disc for another grinding. ;
  • the following grinding rollers and discs grind the materials still in accordance with the original system, the material after the mill is no longer brought to the classifier by gas, but scraped out through the lower scraper, and passed
  • the belt conveyor and hoist feed the materials into the above powder separator for sorting. All materials are transported efficiently from the outside to form an external circulation system, forming an external circulation roller vertical mill.
  • Figure 1 is a schematic diagram of the structure of the present invention.
  • the components in the picture are: 1. Air outlet; 2. Reducer; 3. Motor; 4. Upper cylinder; 5. Main shaft assembly; 6. Feed pipe; 7. Labyrinth seal; 8. Spreading tray; 9. 10. Baffle plate; 10. Air guide blade; 11. Rotary cage; 12. Powder selection cylinder; 13. Primary feed inlet; 14. Powder selection and coarse powder ash hopper; 15. Air inlet; 16. Partition plate; 17. Air lock flap valve; 18. Grinding roller; 19. Rocker arm; 20. Grinding disk; 21. Shaft support; 22. Spout ring; 23. Discharge ring; 24. Scraper; 25. Discharge ⁇ ; 26, reducer; 27, main motor; 28, hydraulic cylinder; 29, grinding cylinder; 30, air inlet cylinder.
  • An external circulation roller type vertical mill as shown in Figure 1 includes a mill housing, a grinding disc 20 and a grinding roller 18 are arranged in the mill housing, and a powder separator is arranged on the upper part of the mill housing.
  • the grinding disc 20 is installed on the reducer 26, and the main motor 27 provides power to the reducer 26.
  • the grinding roller 18 is arranged on the shaft support 21 through the rocker arm 19, and is equally divided and evenly distributed on the periphery of the mill shell.
  • the rocker arm 19 is also connected to a hydraulic cylinder 28.
  • a ring-shaped partition plate 16 is provided in the middle and upper part of the mill housing to divide the mill housing into a grinding cylinder 29 and a powder selecting cylinder 30.
  • a wind lock flap valve 17 is installed under the partition plate 16.
  • a powder classifier is provided in the powder classifying cylinder 30, and the outlet of the powder classifying coarse powder ash hopper 14 of the powder classifier passes through the annular partition plate 16 and extends into the grinding cylinder body. In 29, the outlet of the powder ash hopper 14 corresponds to the center of the grinding disc 20.
  • An air inlet 15 is provided at the lower part of the powder selection cylinder.
  • one or more air inlets 15 are provided.
  • the air inlet 15 is connected with a circulating fan, and the gas required for powder selection enters from the air inlet 15 .
  • the grinding disc 20 and the grinding roller 18 are arranged in the lower part of the grinding cylinder 29, a spout ring 22 is arranged between the outer circumference of the grinding disc 20 and the mill shell, and a discharge ring is arranged in the lower part of the spout ring 22 23.
  • a discharge port 25 is also provided at the bottom of the discharging ring, and a scraper 24 is installed around the grinding disc. The scraper 24 scrapes the material to the lower discharge port 25, thereby discharging the mill Outside the machine.
  • a material lifting mechanism is also provided at the discharge port 25. The material lifting mechanism sends the material to the powder separator in the powder separator cylinder 30 and is connected to the feed pipe 6 of the powder separator.
  • the rotating cage 11 inside the powder separator is connected to the reducer 2 of the powder separator through the main shaft assembly 5, and the reducer 2 is driven by the main shaft transmission motor 3, and the transmission device is installed on the upper cylinder 4.
  • a labyrinth seal 7 is provided on the upper part of the rotating cage 11 to separate the materials entering the sprinkling tray 8 in the powder separator from the inside of the rotating cage 11.
  • the large-particle materials that need to be ground enter the primary feed inlet 13 and enter the mill together with the sorted coarse powder in the powder ash hopper 14 for grinding.
  • the materials are in the grinding cylinder 29,
  • the transmission part of the mill composed of the main motor 27 and the reducer 26 drives the grinding disc 20 to rotate, and the intermediate material moves to the periphery due to the centrifugal force, and moves to the area between the grinding disc 20 and the grinding roller 18 for rolling.
  • the grinding roller 18 is hydraulically pressed.
  • the cylinder 28, the rocker arm 19, the hydraulic cylinder 28 and the shaft support 21 exert a rolling pressure downward, and the crushed material moves outwards out of the retaining ring on the edge of the grinding disc, and falls into the material through the nozzle ring 22.
  • the scraper 24 installed on the grinding disc scrapes the material to the discharge port 25.
  • the discharge port 25 enters the peripheral belt conveyor and is transported out, and the material is sent to the feeding pipe 6 through the lifting device, and enters the sprinkling disc 8 of the upper classifier, and the sprinkling disc 8 is installed in the rotating cage.
  • the rotating cage 11 is driven by the motor 3, the reducer 2 and the main shaft assembly 5 on the upper part of the powder concentrator to rotate, and sprinkle the fed material onto the outer baffle 9 and fall into the air guide blade 10. And the powder selection area formed by the blades of the rotating cage 11.
  • the powder selection area is contained in the powder selection cylinder 12.
  • the airflow entering the air inlet cylinder 30 rotates upwards and enters the powder selection area through the air guide blade 10 to separate the incoming materials.
  • the coarse particles cannot enter the powder separator due to their large mass and large centrifugal force. Inside the cage 11, the coarse particles fall into the powder hopper 14 and the large particles from the primary feed port 13 are fed into the mill for rolling and grinding.
  • the fine powder in the powder selection area is due to the quality If the gas is small and the centrifugal force is small, it will be carried by the gas into the inside of the rotating cage 11, and move upward into the upper cylinder 4, and go out from the air outlet 1 into the subsequent dust removal equipment, and the fine powder will be separated from gas and solid, and the fine powder will be collected. Then the circulating fan that enters the back of the dust removal equipment is discharged into the atmosphere or recirculates into the air inlet 15 to enter the next round of sorting.
  • the air flow used for the powder separator is supplied by a circulating fan, forming a gas flow field inside the powder separator.
  • a labyrinth seal 7 is provided on the upper part of the rotating cage 11 to separate the material entering the material on the sprinkling tray 8 in the powder concentrator from the inside of the rotating cage 11 to prevent the material from directly entering the inside of the rotating cage without being sorted, causing the powder to be coarse. happening.
  • the invention separates the mill from the powder separator by setting a partition plate, and the above powder separator forms an independent system, but is located on the upper part of the mill body, so that the coarse materials after powder selection can directly enter the grinding disc for another grinding. ;
  • the following grinding rollers and discs grind the materials still in accordance with the original system, the material after the mill is no longer brought to the classifier by gas, but scraped out through the lower scraper, and passed
  • the belt conveyor and hoist feed the materials into the above powder separator for sorting. All the materials that have been crushed and ground are transported efficiently from the outside to form an external circulation system, forming an external circulation roller vertical mill.
  • the working principle has completely changed the way of conveying materials solely by pneumatics and changed to a highly efficient mechanical concentration.
  • the conveying method can greatly save energy consumption, and because the two independent grinding systems are organically combined with the sorting system, it saves space and greatly saves civil construction costs. Due to the change of the air intake mode of the powder classifier, the air can be easily introduced according to the surrounding conditions, and it is also convenient for the peripheral equipment to have a negative pressure state, and it is also conducive to the clean production of the peripheral equipment.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)

Abstract

一种外循环辊式立磨,在磨机壳体的中上部设置有一分隔板(16),将磨机壳体分隔成粉磨筒体(29)以及选粉筒体(12);在选粉筒体(12)内设置有选粉机,选粉机的选粉粗粉灰斗(14)的出口穿过分隔板(16)伸入到粉磨筒体(29)内,在选粉筒体(12)的下部设置有进风口(15);磨盘(20)以及磨辊(18)设置在粉磨筒体(29)的下部,在磨盘(20)的外圆周与磨机壳体之间设置有喷口环(22),在喷口环(22)的下部设置有出料环道(23),在出料环道(23)的底部还设置有出料口(25),在出料口(25)处还通过物料提升机构将物料送入选粉筒体(12)内选粉机的进料管(6)。

Description

一种外循环辊式立磨 技术领域
本发明涉及一种料床粉磨设备,特别涉及一种外循环辊式立磨。
背景技术
在粉磨生产作业中,需要把大量粗颗粒磨细成细粉,并需要将细粉中的颗粒按一定粒径大小分开来,成为合格产品。这些粉磨作业的设备就是粉磨设备。目前常见的粉磨设备有管磨机、辊压机以及辊式立磨。由于辊压机与辊式立磨属于料层粉磨设备,其粉磨效率要高于管磨机,因此在粉磨作业中达到了广泛的应用。
辊式立磨是利用料层粉磨原理进行粉磨物料的一种研磨机械,现已被广泛应用于水泥、煤炭、电力、冶金、选矿等行业。目前常见立磨是一种全风扫式磨机,通过磨辊与磨盘的相对运动将物料粉碎,并靠热风将磨细的物料烘干、向上带起进入选粉机内,由选粉机在磨内分级,粗粉落入磨盘上重新被粉碎;成品利用气流送出磨外由收尘器收集。具体过程:入磨物料经过挤压,随着磨盘的旋转,在离心力作用下物料从磨盘边缘翻落到喷口环处,靠该处的高速旋流风吹起,吹散,金属、重矿石将沉降到喷口环下排出。细粉带到立磨上部,经选粉机分选,成品随同气体进入收尘器收集起来。分选出的粗颗粒则落入磨盘上再次粉磨,而在喷口环处高速旋流风将那些粗颗粒抛起,在上升过程中随着风速的降低,使其逐渐失去依托而沉降到磨盘上,靠离心力又进入磨辊与磨盘的碾压区域又一次的碾压粉磨。由此,经多次循环,颗粒与气体之间传热使水分蒸发。
立式磨由机壳与机座、磨辊与磨盘、加压装置、分级装置、传动装置和润滑系统等六大部分组成。
辊式立磨是一种全风扫式磨机,磨辊与磨盘之间粉磨出来的物料,在喷口环处依靠高速的气体将物料吹起分散,并往上抬升,较粗的颗粒被带起吹向上方,由于其重力作用在落下过程中受到自下而上的高速气流作用,部分物料始终处于悬浮状态,部分物料在抬升过程中则落入到磨盘上,从磨盘边缘滑落又被喷口环处的气流吹起,因此就形成了大量的内循环,导致其内部粉尘浓度太高,因而会导致往上运动的气流阻力较大,再加上喷口环处风速较高,其阻力也较高,立磨整个压差普遍较高,一般在7000-10000Pa之间,这么大的阻力,利用气力作用将大量的物料由下而上带起需要消耗大量的能耗,直接增加了能耗的上升。
在磨内较细的物料由气体带起一直向上进入选粉机进行分级,分选出的较粗的粉料落入到内灰斗中,进入磨盘中重新粉磨,而我们所需要的细粉(成品)则随着气体进入后续的除尘器内进行气固分离。由于所有的物料都需要气体进行提升运输,而且气体在立磨磨体内的风道处于不规则通道,存在各种各样的涡流等现象,风速高,阻力大,而且在实际生产中,由于大量的粉体物料需要抬升,在磨盘上粉尘浓度很高,导致气体阻力较大,在物料提升过程中,如遇到系统风量的波动,打破了气体压力的平衡,还会导到悬空的物料出现垮塌等现象,造成磨辊振动异常而出现跳停。这种依靠气体抬升输送物料的方式既消耗大量的能耗,也会带来其他不稳定的因素。
发明内容
本发明的目的是为了克服上述问题,提供一种外循环辊式立磨。
为达到上述目的,本发明采用的方法是:一种外循环辊式立磨,包括磨机壳体,在所述的磨机壳体内设置有磨盘以及磨辊,在磨机壳体上部设置有选粉机,在磨机壳体的中上部设置有一分隔板将磨机壳体分隔成粉磨筒体以及选粉筒体;在所述的选粉筒体内设置有选粉机,选粉机的选粉粗粉灰斗的出口穿过所述的分隔板伸入到所述的粉磨筒体内,在选粉筒体的下部设置有进风口;所述的磨盘以及磨辊设置在粉磨筒体的下部,在磨盘的外圆周与磨机壳体之间设置有喷口环,在喷口环的下部设置有出料环道,在所述的出料环道的底部还设置有出料口,在出料口处还设置有物料提升机构,所述的物料提升机构将物料送入选粉筒体内的选粉机上,并与选粉机的进料管连接。
作为本发明的一种改进,在所述的分隔板下安装有锁风翻板阀,用于将分隔板上进风口有可能的积料排入到粉磨筒体内。
作为本发明的一种改进,在磨盘四周安装有刮料板,由刮料板将物料刮至下部的出料口,由此排出磨机外。
作为本发明的一种改进,在所述的进风筒体上有一个或多个进风口,选粉所需要的气体则由该进风口处进入。
作为本发明的一种改进,所述的磨盘安装在减速机上,由主电机给减速机提供动力。
作为本发明的一种改进,选粉机内部的转笼通过主轴总成与选粉机减速机相连,该减速机由主轴传动电机带动,该传动装置安装在上部的筒体上。
作为本发明的一种改进,在所述的转笼上部设置有一密封机构,将进入选粉机内撒料盘上的物料与转笼内部分开。
作为本发明的一种改进,所述的磨辊通过摇臂设置在轴座支架上,且等分均匀分布在磨机壳体周边。
作为本发明的一种改进,所述的摇臂还与液压油缸相连,通过液压油缸对磨辊施加作用力。
作为本发明的一种改进,所述的选粉粗粉灰斗的出口与磨盘的中心对应。
有益效果:
本发明通过设置分隔板将磨机与选粉机分割开,上面的选粉机形成独立的体系,只是坐落于磨体上部,便于选粉后的粗物料直接进入磨盘上进行再一次粉磨;下面的磨辊与磨盘粉磨物料仍然按照原来的体系运行,磨机粉磨后的物料则不再由气体带到选粉机处,而是通过下面的刮板将物料刮出,并通过皮带机以及提升机将物料送入到上面的选粉机内进行分选。所有的物料从外面途径高效率输送,形成外循环系统,形成外循环辊式立磨,从工作原理上彻底改变了全靠气力输送物料的方式,改为高效的机械集中输送方式,可大大节约能耗,而且由于两个独立的粉磨系统与分选系统有机的结合在一起,节约了空间,大大地节约了土建费用。由于选粉机进风方式的改变,可以根据周边情况方便地进风,也便于周边设备存在负压状态,也有利于周边设备的清洁生产。
附图说明
图1为本发明的结构示意图。
图中各部件为:1、出风口;2、减速机;3、电动机;4、上部筒体;5、主轴总成;6、进料管;7、迷宫密封;8、撒料盘;9、挡料板;10、导风叶片;11、转笼;12、选粉筒体;13、一次进料口;14、选粉粗粉灰斗;15、进风口;16、分隔板;17、锁风翻板阀;18、磨辊;19、摇臂;20、磨盘;21、轴座支架;22、喷口环;23、出料环道;24、刮料板;25、出料口;26、减速机;27、主电机;28、液压油缸;29、粉磨筒体;30、进风筒体。
具体实施方式
下面结合附图和具体实施例,进一步阐明本发明,本实施例在以本发明技术方案为前提下进行实施,应理解这些实施例仅用于说明本发明而不用于限制本发明的范围。
实施例1:
如图1所述的一种外循环辊式立磨,包括磨机壳体,在所述的磨机壳体内设置有磨盘20以及磨辊18,在磨机壳体上部设置有选粉机,所述的磨盘20安装在减速机26上,由主电机27给减速机26提供动力。磨辊18通过摇臂19设置在轴座支架21上,且等分均匀分布在磨机壳体周边。所述的摇臂19还与液压油缸28相连。
在磨机壳体的中上部设置有一环形的分隔板16将磨机壳体分隔成粉磨筒体29以及选粉筒体30,分隔板16下安装有锁风翻板阀17。在所述的选粉筒体30内设置有选粉机,选粉机的选粉粗粉灰斗14的出口穿过所述的环形的分隔板16伸入到所述的粉磨筒体29内,选粉粗粉灰斗14的出口与磨盘20的中心对应。
在选粉筒体的下部设置有进风口15,在本实施例中进风口15设置有一个或多个,进风口15与循环风机相连,选粉所需要的气体则由该进风口15处进入。
所述的磨盘20以及磨辊18设置在粉磨筒体29的下部,在磨盘20的外圆周与磨机壳体之间设置有喷口环22,在喷口环22的下部设置有出料环道23,在所述的出料环道的底部还设置有出料口25,在磨盘四周安装有刮料板24,由刮料板24将物料刮至下部的出料口25,由此排出磨机外。在出料口25处还设置有物料提升机构,所述的物料提升机构将物料送入选粉筒体30内的选粉机上,并与选粉机的进料管6连接。
选粉机内部的转笼11通过主轴总成5与选粉机减速机2相连,该减速机2由主轴传动电机3带动,该传动装置安装在上部的筒体4上。
在所述的转笼11上部设置有一迷宫密封7,将进入选粉机内撒料盘8上的物料与转笼11内部分开。
具体工作流程:
需要粉磨的大颗粒物料由一次进料口13进入,并和选粉粗粉灰斗14里的分选后的粗粉一起进入磨内进行粉磨,物料在粉磨筒体29内,由主电机27和减速机26组成的磨机传动部分带动磨盘20旋转,将中间物料因离心力作用,物料向外围移动,移动到磨盘20与磨辊18之间区域进行碾压,磨辊18由液压油缸28、摇臂19、液压油缸28以及轴座支架21的作用,向下施加碾压力,碾压过的物料向外运动翻出磨盘边缘的挡料圈,通过喷口环22处落入到出料环道23中,由安装在磨盘上面的刮料板24将物料刮到出料口25处。
由此出料口25进入外围的皮带输送机上运出,并通过提升设备将物料送到进料管 6处,进入上部选粉机的撒料盘8上,该撒料盘8安装在转笼11上,转笼11在选粉机上部的电机3和减速机2以及主轴总成5的带动下旋转,将喂入的物料撒向外围的挡料板9上,落入由导风叶片10和转笼11叶片所组成的选粉区域。
该选粉区域包含在选粉筒体12内,在选粉筒体下部有进风筒体30,进风筒体30上有一个或多个进风口15,选粉所需要的气体则由该处进入,进入进风筒体30的气流旋转向上,通过导风叶片10进入到选粉区域,对进入的物料进行分选,粗颗粒由于质量大,其离心力大,则不能进入选粉机转笼11内部,粗颗粒则落入到选粉粗粉灰斗14中与一次进料口13进入的大颗粒一起喂入磨机内进行碾压粉磨,而在选粉区域的细粉由于质量小,离心力小,则被气体携带进入转笼11内部,并向上运动到上部筒体4内,并由出风口1出去进入后续的除尘设备,将细粉气固分离,细粉收集下来,气体则进入除尘设备后面的循环风机排入大气或再次循环进入进风口15,进入下一轮的分选作用。
选粉用的气流由一台循环风机进行供给,在选粉机内部形成一个气体流场。
在转笼11上部设置一迷宫密封7,将进入选粉机内撒料盘8上的物料与转笼11内部分开,防止该处物料没有分选而直接进入转笼内部造成选粉跑粗的情况。
在进风筒体下部的分隔板16下,安装有几个锁风翻板阀17,主要用于防止进风筒体30下部的分隔板16上由于风速变化而导致积料,如果有积料,就由该处的锁风翻板阀17将物料排出到磨内进行粉磨。
本发明通过设置分隔板将磨机与选粉机分割开,上面的选粉机形成独立的体系,只是坐落于磨体上部,便于选粉后的粗物料直接进入磨盘上进行再一次粉磨;下面的磨辊与磨盘粉磨物料仍然按照原来的体系运行,磨机粉磨后的物料则不再由气体带到选粉机处,而是通过下面的刮板将物料刮出,并通过皮带机以及提升机将物料送入到上面的选粉机内进行分选。所有的碾压粉磨过的物料从外面途径高效率输送,形成外循环系统,形成外循环辊式立磨,从工作原理上彻底改变了全靠气力输送物料的方式,改为高效的机械集中输送方式,可大大节约能耗,而且由于两个独立的粉磨系统与分选系统有机的结合在一起,节约了空间,大大地节约了土建费用。由于选粉机进风方式的改变,可以根据周边情况方便地进风,也便于周边设备存在负压状态,也有利于周边设备的清洁生产。
本发明方案所公开的技术手段不仅限于上述技术手段所公开的技术手段,还包括由以上技术特征任意组合所组成的技术方案。应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也视为本发明的保护范围。

Claims (10)

  1. 一种外循环辊式立磨,包括磨机壳体,在所述的磨机壳体内设置有磨盘以及磨辊,在磨机壳体上部设置有选粉机,其特征在于:在磨机壳体的中上部设置有一分隔板将磨机壳体分隔成粉磨筒体以及选粉筒体;在所述的选粉筒体内设置有选粉机,选粉机的选粉粗粉灰斗的出口穿过所述的分隔板伸入到所述的粉磨筒体内,在选粉筒体的下部设置有进风口;所述的磨盘以及磨辊设置在粉磨筒体的下部,在磨盘的外圆周与磨机壳体之间设置有喷口环,在喷口环的下部设置有出料环道,在所述的出料环道的底部还设置有出料口,在出料口处还设置有物料提升机构,所述的物料提升机构将物料送入选粉筒体内的选粉机上,并与选粉机的进料管连接。
  2. 根据权利要求1所述的一种外循环辊式立磨,其特征在于:在所述的分隔板下安装有锁风翻板阀。
  3. 根据权利要求1所述的一种外循环辊式立磨,其特征在于:在磨盘四周安装有刮料板,由刮料板将物料刮至下部的出料口,由此排出磨机外。
  4. 根据权利要求1所述的一种外循环辊式立磨,其特征在于:在所述的进风筒体上设置有一至多个进风口,选粉所需要的气体则由该进风口处进入。
  5. 根据权利要求1所述的一种外循环辊式立磨,其特征在于:所述的磨盘安装在减速机上,由主电机给减速机提供动力。
  6. 根据权利要求1所述的一种外循环辊式立磨,其特征在于:选粉机内部的转笼通过主轴总成与选粉机减速机相连,该减速机由主轴传动电机带动,该传动装置安装在上部的筒体上。
  7. 根据权利要求6所述的一种外循环辊式立磨,其特征在于:在所述的转笼上部设置有一密封机构,将进入选粉机内撒料盘上的物料与转笼内部分开。
  8. 根据权利要求1所述的一种外循环辊式立磨,其特征在于:所述的磨辊通过摇臂设置在轴座支架上,且等分均匀分布在磨机壳体周边。
  9. 根据权利要求7所述的一种外循环辊式立磨,其特征在于:所述的摇臂还与液压油缸相连,通过液压油缸对磨辊施加作用力。
  10. 根据权利要求1所述的一种外循环辊式立磨,其特征在于:所述的选粉粗粉灰斗的出口与磨盘的中心对应。
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