JULI Engineering

For the burning active lime, the rotary kiln has the following features and advantages compared with other forms of rotary kiln. (1) In the course of the burning, the temperature of combustion apparatus is easy to control. So the quality of calcining is good, and the activity degree of lime could reach 350-400ml with low pollution. (2) The rotary kiln could calcine the materials with smaller grain size(over 5mm), increasing the use ratio of the materials. The products could be used in converter steelmaking without the crushing process because of small size of materials (generally 20-50mm). (3) The mechanization degree of rotary kiln is high, and the operation process is easy to control. The productivity is large, which is suitable for the requirements for the metallurgy, smelt and other large-scale industries. (4) The rotary kiln system has many machines with large weight. So the steel dosage is large and the investment cost is much. (5) The materials wear greatly in the rotary ki

The mining equipment is essential for mining enterprises. Mining equipment includes stacker reclaimer , belt conveyor, apron feeder, screw feeder and etc. If there is no mining equipment supporting the whole enterprise, the mining enterprise could not normally operate. With the development of the machinery technology, the requirements for mining equipment maintenance become stricter than before. In order to keep the normal operation of the equipment, it is necessary that the related people take measures to check the equipment in regular time. Especially for the EPC companies , they do better in machinery maintenance. The emphasis of machinery maintenance should be placed on the prevention of machinery fault. The timely correction is very important when faults occur. The contents of maintenance include the outer of the mining equipment , such as clutch, brake, safety facilities and other important components. Besides, the related people should check whether each device becomes flexibl

Most EPC companies will choose the pipe conveyor to transport the materials rather than the normal belt conveyor. The unique belt conveyor design of pipe conveyor enables the belt conveyor. The pipe conveyor is the special belt conveyor developed from troughed belt conveyor. It is developed through compelling force on idler sets to the pipe form, in which the materials are sealed in the pipe. In this way, the materials could be protected in the pipe and this pipe conveyor reduces the pollution to the environment. The pipe conveyor has the following features: (1) The pipe conveyor is similar to the normal belt conveyor. It is easier to be accepted to the most users. (2) The pipe conveyor could prevent the other things sneaking into the materials. According to its principle, the pipe conveyor could realize the sealing conveying, avoiding the materials escape in the course of transportation. (3) The pipe conveyor could be set in flexible way, realizing the space turning. In this w

1. The purpose and significance The belt conveyor is the main equipment handling the bulk materials. Belt conveyor is widely used in metallurgy, chemical industry, mining, power plant, ports and other industrial fields. With the development of economy and technology, the belt conveyor develops in the direction of long distance, large volume, high speed. Especially in the mining equipment field, more and more belt conveyors are applying in conveying materials. To reduce the investment cost of forwarding station, the belt conveyor with horizontal curves is designed and manufactured. 2. The development situation of belt conveyor with horizontal curves According to some statistics, a belt conveyor with horizontal curves was launched to working in Algeria iron mine site in 1970, with length of 2385m, lifting height of 121m, conveying volume of 1000tons per hour. A coal belt conveyor with horizontal curves was launched to working in South Africa in 1978 with length of 3.5 km. After

The maintenance of conveyor has a direct influence on whether the service life of conveyor could be prolonged. So this maintenance job must be important in the course of operating the conveyor. There are many conveyor components. If we know these conveyor components well, the service life of conveyor could be prolonged through the conveyor components . Conveyor roller(idler) is used to load the conveyor belt. It is the bearing component for the belt conveyor, with uniform cylinder form. In the center of idler(roller), there is a hollowed-out column hole, which is used to connect the bearing device of conveyor. The machining precision of idler means inner bore concentricity of idler and the precision of axial dimensions. If the dimension error of concentricity is serious, the bearing seizure of rolling bearing will occur, increasing the running resistance and reducing the time of service life. If the error of axial dimensions of parts is serious, the large axial clearance will form, r

The slewing bearing could support the large axial load, radial load and inclining moment, which is widely used in wind power generation, hoisting machinery, mining machinery, construction machinery, harbor machinery, marine machinery, national defense equipment, and other large-scale slewing device. For a long time, the assembly technique of steel ball and separate unit adopts manual assembly. The high labor intensity and low working performance create the failure of assembly quality. The slewing bearing technology is widely used in many fields. The stacker reclaimer is a technology product of slewing bearing. However, any product needs the daily maintenance. The auxiliary equipment is applied to inject descaling fluid in high pressure. That the stacker reclaimer rotates over and over again makes the relative movement of friction pair occur, cleaning the grime and duct depositing on the roller path. After that, the engine oil will be injected into the slewing bearing to clean th

As we all know, the belt conveyor has many ways of prolonging the service life. And a good belt conveyor design counts a lot. Usually the belt conveyor coordinates with the stacker reclaimer . There are keys to successful preventive maintenance that can be summed up in two words, “Good Housekeeping”. Good belt conveyor and idler maintenance begins with “Good Housekeeping”, the master key to getting the highest return on your conveyor dollar. We have found the following procedures play a prominent part at almost every installation where high standards of maintenance are achieved. They provide excellent guidelines for any operator. 1. inspection – The key is timing and who does it. It should be done daily and ideally performed by the Maintenance Superintendent or the Foreman. 2. prompt repairs – Repairs should be made as soon as possible after reported – daily if possible. 3. conveyor records – keep a brief outline history of each conveyor noting such things as the original

Although the bucket wheel stacker reclaimer has some advantages such as large radius, high capacity, low cost, environment friendly, the problems of it also exist. The feed rate is not insufficient when  reclaiming materials. The feed rate is that the onward distance of reclaimer, which is controlled by walking motor and controls the depth of reclaiming materials. In generally, there are two reclaiming speed. The onward distance is about 24mm when it is in low speed(200 t/h), while the onward distance is about 60mm when it is   in high speed(500 t/h). There is insufficient materials in piles. If the capacity of materials is large, the height of material pile is higher. In this way, the materials reclaimed be reclaimer is much more than that of small quantity of materials, which could increase the productivity of stacker reclaimer. Otherwise, the productivity of stacker reclaimer will be influenced greatly. When bucket wheel stacker reclaimer reclaims the materials, the equipment

The maintenance of conveyor has a direct influence on whether the service life of conveyor could be prolonged. So this maintenance job must be important in the course of operating the conveyor. There are many conveyor components . If we know these conveyor components well, the service life of conveyor could be prolonged through the conveyor components. Conveyor roller(idler) is used to load the conveyor belt. It is the bearing component for the belt conveyor, with uniform cylinder form. In the center of idler(roller), there is a hollowed-out column hole, which is used to connect the bearing device of conveyor. The machining precision of idler means inner bore concentricity of idler and the precision of axial dimensions. If the dimension error of concentricity is serious, the bearing seizure of rolling bearing will occur, increasing the running resistance and reducing the time of service life. If the error of axial dimensions of parts is serious, the large axial clearance will form,

With the development of coal mine production mechanization, the belt conveyor is more and more widely used in the coal power plant. Then let us discuss some problems of belt conveyor design and some reformations. In the mine excavation, how to solve the non-interaction of conveyor and track conveying, reduce the cost of equipment? The good belt conveyor design is necessary. Because of the complex geological structures, there would be crossed roadways in the coal mine. Then the belt conveyor design should solve the difficulty of crossed lapping technique. There are two ways advised. The headstock of belt conveyor is transformed. Prolonging the roller support frame and increasing the height of headstock foundation realizes the control of height of conveyor belt and baseboard, achieving the purpose of no interference among conveying materials in rail and conveying materials by conveyor belt. The second way is on the basis of the first way failure. The end of belt conveyor would be l

The magnetic separator is one of the mining equipment. It is the main equipment in the production line of magnetic separation. The efficiency of magnetic separation is the hot issue for manufacturers and users. How to increase the efficiency is very important technological problem. There is some advice from NHI. 1. The usage of machine for blending material The magnetic separator completes the magnetic separation through the magnetic force. If the material layer is thick, the effect of magnetic separation will be bad. So the users could increase the magnetic separation efficiency through the machine for blending materials. 2. The height adjustment of material distribution board The height of material distribution board influences the effect of magnetic separation. When the height of material distribution board is low, the lean magnetite could not recycled better, reducing the use ratio of ore resources. When the height of material distribution board is high, the gangue mineral coul

The life circle of project could be divided into concept, developing, implementing, and ending. And there are five main processes of project management of EPC companies . The introduction is as follows: 1. Starting process of project The starting process includes project identification and starting. The leader of project should know the concept that the tiny success of important project has more significance and value that that of unimportant project. So the starting process is so important because the investment is determined in this stage. Emphasis on starting process is the first step to guarantee the success of the project. 2. Planning process of project The detailed planning of project scope, task decomposition, resource analysis should be completed in this stage, making the teamwork easy to carry on. According to the planning, we could complete the work more quickly and orderly. 3. Implementation process of project In this stage, the key points of the project are emphasi

As we all know, the apron feeder would always coordinate with other mining equipment (such as screw conveyor , long inclination belt conveyor, stacker reclaimer ) to realize the materials handling process. Then sometimes the apron feeder would have something wrong in the operation. Equipment failure Torque transmission fitting surface of transmission main shaft and reducer hollow shaft has relative rotation, resulting in abrasion of hollow shaft and shaft. Causes analysis 1. After long time operating, the metal would have metal fatigue, transforming from elastic deformation to plastic deformation. Then there would be gap of the fitting surface between shaft and bearing cone, resulting in the abrasion. 2. In the course of operating, the lack of lubrication and cooling leads to the heating of bearing, the increasing the running resistance, and the bending deformation of bearing. Traditional solution repairing welding：difficult installation, low efficiency, long period, high co

In practice, the slewing bearing failed in many aspects, such as larger load, abnormal impact, abrasion in raceway, noise increasing and other problems. The main causes of these problems include the installation of slewing bearing, stress of slewing bearing, and post-maintenance of slewing bearing. The installation of slewing problems mainly include quality flaw of slewing bearing. The overall quality of slewing bearing is better, but there will be some problems in transporting and storing, such as deformation in slewing bearing. The weak location of slewing bearing is broken. The ball track of slewing bearing is processed with quenching. Then there will be quenching weak area in the slewing bearing, where the hardness and intensity are poor. In this way, the failure of slewing bearing may occur because of this reason. Besides, installation accuracy of slewing bearing is bad. When the slewing bearing works, its end face and supporting platform should coordinate closely. If the f