JULI Engineering

After many projects practice, the intelligent lubricating system of bucket wheel stacker reclaimer has reliable operating and good lubricating effect.For each lubricating point, the related people lubricate according to the demands. There will be no grease waste and lacking of lubrication. The consumption of grease is greatly decreased compared with the traditional lubrication. In this way, the surrounding environment will be kept clean, reducing the environment pollution. The good lubrication could reduce the rate of breakdown and increase the working efficiency of stacker reclaimer. The oil mass could be set and adjusted in distance. As a result, the workers could save the time of checking equipment.  In conclusion, the intelligent lubricating system of bucket wheel stacker reclaimer has following advantages: 1.Each point breakdown is clear, which make the maintenance easy.  2.Each point of lubrication system separately sets the cycle time and oil supply. The operator cou

The big-obliquity flexible side wall belt conveyor is a new belt conveyor in our country. In recent years, it is widely used in coal, chemical engineering, electric power, building materials, metallurgy, light industry, ports, shipping and etc. It has many advantages such as large delivery value, avoiding of scattering, long conveying distance, small floor space, simple processing set-up, small infrastructure scale, saving the building cost of projects and etc. The big-obliquity flexible side wall belt conveyor increases the height of the flexible rubber on the both sides of paralleled rubber conveyor belt making the material in a box-shaped containers for delivery. The largest feature of big-obliquity flexible side wall belt conveyor is using sidewall angle belt to replace the common belt. The principle and structural composition of it are same with the common belt conveyor. In this way, many spare parts could be in common use with the common belt conveyor components such as driv

The new apron feeder handling household garbage is a kind of light conveying equipment, which is mainly used in refuse processing plant. This apron feeder is placed to receive the garbage. The carrying capacity of this apron feeder is ten times larger than that of common belt conveyor. The service life of this apron feeder is five to eight times longer than that of belt conveyor. The garbage content is complicated, which will destroy the belt of common belt conveyor, resulting in the halt production. Our company adopts mould pressing carrier plate, which would reduce the situation of clamping materials. The driving part adopts carrier chain plate with high strength, which would greatly increase strength of extension and prolong the service life.  The structure of new apron feeder: 1. transmission: motor, reducer, coupling, rack 2. main wheel device: engine base, gear, driving shaft, chain wheel, transmission shaft, front stand 3. chain 4. chain board 5. tail pulley devi

Because of serious air pollution and water pollution, all the people propose that the energy conservation, emission reduction, and environmental protection should be placed in the first place. The environmental protection has become the national strategy. In the aspect of choosing mining equipment including stacker reclaimer , belt conveyor , apron feeder, the situation is same. The mining, crushing, screening, sand-making processes are completed in outdoors, which would result in noise, dust, polluted water and other wastes. If not choosing the equipment and designing the processes from the view of environmental protection, we will cause the pollution to the environment. The enterprise should increase the investment in the environmental protection, improving the production line which could not meet the related standards. Building the environment friendly sand making line could help to minimize the environmental pollution and destroy during the production period.  Our company brin

One reclaiming operating line with two bucket wheel stacker reclaimers is mainly used in the coal blending working in wharf, which belongs to belt conveyor mixture coal blending method. The fetching and coal blending means that the coals are stored and fetched by two reclaimers. BQ1 and BQ2 will be allocated with one reclaimer. Finally, the materials are transported to the ship loader. If the coal blending demand and reclaiming proportion is different, the reclaiming with low reclaiming proportion will have underloading situation, which results in the energy waste.  "One belt, two machines" layout could obviously avoid the light running of belt conveyor. After comparing the advantages and disadvantages of different layout, most wharfs will adopt "one belt, two machines" layout. One reclaiming operating line with two bucket wheel stacker reclaimers has been widely used in the wharfs of coal blending such as port of Qinhuangdao, port of Tianjin, port of Huanghua,

The circular stacker reclaimer is one kind of equipment which could do homogenization treatment, storage, and transportation of materials. The circular stacker reclaimer is made up of column structure, main beam structure, travelling device, rake, trolley, cantilever belt conveyor, platform railings, transmission and etc. The circular stacker reclaimer is one of the important equipment in cement plant, which could complete the stacking and blending reclaiming work of limestone. Besides, other material handling equipment will be adopted by most EPC companies. to coordinate it such as apron feeder, screw conveyor, pipe conveyor, stone crusher and etc. The circular stacker reclaimer plays an important role for the advance homogenization, stabilization and quality of clinker for the limestone. The circular stacker reclaimer integrates the stacking and reclaiming function. The circular stacker reclaimer has three components including stacker, reclaimer, and center pillar. There are two

With the economic globalization, the bulk cargo terminal plays an important role. Our company optimizes the design of bulk cargo terminal to increase the operating efficiency and reduce the cost.  The bulk cargo terminal is one important part of handling system and also the place where the materials are stored. The optimizing of the belt conveyor system could increase the flexibility of stacker reclaimer , increasing the use ratio of stock yard. In this way, the operation efficiency could be better, realizing the energy conservation and efficiency of storage yard.  According to the characteristics of bulk cargo, the loading and unloading line is divided into 3 types including stacking line, reclaiming line, and combined line. According to different processing layout, the belt conveyor system will be collocated with different handling machinery such as stacker, reclaimer, apron feeder,  pipe conveyor and etc. In generally, one belt conveyor system is arranged with one handling

At present, the main problems of automated warehouse include low use ratio, unobvious effects, uncertain scale, unobtrusive advantage, which makes many storage resources idle. The reasons are mainly showed in following aspects:  The diagnoses working of warehouse construction and plan is not completed successfully. There is no necessary research and analyzing. After completing the construction of automated warehouse, people will find that the use ratio is so low.  People has poor understanding for the warehouse mechanization and roboticized idea. The lack of understanding and reluctance of using equipment make people stay in the stage of manual operation and have no confidence in the automated warehouse. In this way, the automated warehouse's research and usage are abandoned inwardly.  Although the change of external factor and turn of events, the warehouse equipment and management system have not related change and upgrade. As time passes, it will lose the original market,

For the impact stone crusher , the periodic maintenance working is very important. The stone crusher must be lubricated periodically. The machine should be checked before starting and after stopping. When the daily maintaining is completed perfectly, the stone crusher could have sufficient application.  The lubrication of impact stone crusher: Before starting the impact stone crusher, the moderate lubricating grease should be added between brackets. The selecting of the lubricating grease should be according to the using site and conditional decision. In generally, the calcium-based and sodium-based lubricating grease are adopted. The lubrication could guarantee the normal running and prolong the service life of stone crushers. The lubricating grease added into the bearing pedestal should be changed every 3 months. When changing the oil, the clean gasoline or kerosene should be used to clean the rollaway nest of roller bearing.  The usage of impact stone crusher: After the s

The screw conveyor is a kind of equipment which uses motor to drive the screw to rotate. The screw conveyor could transport the materials in horizontal, inclining, and vertical direction. It has many advantages such as simple structure, small cross sectional area, good sealing, easy operation, simple maintenance and etc. During the actual operating, there will be some problems. The reasons analysis of some problems are as follows: The conveyor screw axis would stop rotating. In generally, there are three reasons. The materials handled are too large. In this way, the materials could not get through the hanger bearing, which increases the resistance and results in the load running and machine halt. So the materials must be cleared.  The resistance of middle bearing has large resistance. The sealing is easy to be damaged. If the materials enter into the bearing, the halting and damaging of bearing will occur.  The bearing of reducer is damaged. The bearing temperature of redu

The belt conveyor is widely used to transport the loose materials because of large delivery capacity, simple structure, low cost, easy maintenance and other features. Especially in mining, the belt conveyor has wide application. If the conveyor belt break, the belt will slide for many miles, which would break up the idler, pipe, rack cable, and small parts. If serious, the belt and materials will form bulk deposition, which would result in the halt production. The reasons of belt break are as follows: 1. The gear reducer is damaged. The fluid coupling has hydrojet phenomenon. The changeover of electromotor is also one of the reasons. 2. The conveyor belt joint has something wrong. The conveyor belt joint is divided into mechanical splice and vulcanized joint. The quality of mechanical splice is worse than that of vulcanized joint. So the application ration of mechanical splice is small. For the vulcanized joint, if the vulcanizing temperature and sulfide stress are not controlled

The jaw crusher is the common stone crusher . As we all know, the working environment, materials characteristic and other performance have influence. Therefore, the jaw crusher's maintenance work should be according to the operating process, which could prolong the service life of jaw crusher. How to choose the suitable lubricating grease is one of the important operational capacities for the operating personnel. The matters needing attention are as follows: Selection of lubricating grease: The jaw crusher's working environment is different, which needs different lubricating grease. In summer, outdoor temperature is high. So the No. 70 lubricating oil could be chosen. In winter, the No. 40 lubricating oil is suitable.  Lubricating Mode The bearing and eccentric shaft of large and medium jaw crusher adopts force-circulation lubricating. If the oil pump breaks down, the jaw crusher needs swinging power for 15-20min and then stops. The hand pump needs be used to give oi

At first, the pipe conveyor is accepted because it is a form divided from universal materials handling forms. Now the pipe conveyor is standard. The pipe conveyor is the best solution for transporting grain materials. The application of pipe conveyor is unlimited. If people could think, the pipe conveyor could solve it. We think that any materials could be transported by pipe conveyor. The common materials used by pipe conveyor include mineral, coal, coke, limestone, macadam, shale, alluvium and etc. Some materials could be transported by pipe conveyor such as steel concentrate, petroleum coke, clay, waste residue, concrete, metal, coal ash, tailings, alumina and dust filtration.  The pipe conveyor's obvious advantage is turning in minor radius, which could reduce the silhouette. The pipe conveyor is restricted by surrounding idlers. So the pipe conveyor will not have the off-tracking phenomenon, compared with the common belt conveyor . The pipe conveyor could curve in vertic

The automated warehouse has many advantages such as land saving, high storage efficiency, timeliness and veracity of store management and etc. The automated warehouse is widely used by most EPC companies . In order to complete the design of automated warehouse, the related persons should do following jobs: 1. demand analysis They should conclude and analyze the demands and data of buyers to determine the design objective and standard.  2. confirmation of cargo unit and specification According to the research and statistical result, the related person should confirm the reasonable unit and specification. 3. confirmation of parameter of apparatus The automated warehouse has many forms. In general, unit cargo form is widely used. According to the technological requirements, the related persons confirm the operating type and parameter of apparatus to choose the suitable handling equipment.  4. model building The related person should confirm the layout of warehouse. 

As we all know, the lubrication is very important to the equipment. The lubrication could reduce friction and protect the equipment. The main functions of lubrication include lubricating, cooling, rust protection, cleaning, sealing, buffer and etc. 1. reduce friction and wear Through reducing the friction, we could reduce the wear of mechanical parts and other moving parts, prolonging the service life of moving parts.  2. cooling function The flow of abrasive could take away the heat produced by running. In this way, the equipment could work in reasonable temperature.  3. rust protection After lubrication cover the surface of mechanical friction, the surrounding medium could be avoided to touch, preventing the corrosive function. 4. washing function When the lubrication flows, the dust and related grains could be washed. In this way, the wear could be reduced.  5. damping function The rigidity of lubricating oil is small, which has damping function.  6. sealing

The belt conveyor roller could adopt the black rubber belt, which could be used for transporting materials in bags, sand and gravel, coal briquette and etc. Most EPC companies could realize the positive and negative transportation through increasing gib block below. Besides, we could realize the transportation of bulk materials by adding the dam-boards. The roller is the important part of the conveyor. The roller has many types. The quality of roller directly influences the quality of conveyor. The roller determines the performance of conveyor and service life of conveyor. The structure of roller set confirms the load bearing of conveyor.  The basic requirement of roller includes reasonable structure, wear well performance, better dustproof performance, good waterproofness and reliable performance. The bearing should have good lubrication, light weight, small steering resistance, low fabricating cost and smooth surface. The function of roller is supporting conveyer belt and the ma

The development of modern logistics is the precondition of creating and development of automated warehouse , which is suitable for the development of industry and technology. The modernization production promotes the socialization, specialization and specialization of production. The mechanization and automation require that the supplying of goods and materials should be timely, quick, and accurate. In this way, the development of automated warehouse is promoted. For the arrangement of space, we should make classification first, knowing the using direction of each location. Then we should assess the importance and design the layout. If the space is limited not changing the planning and design, we should let the present space's use ratio fully used. The requirements of goods shelf are high. The appearing of automated warehouse drives the development of goods shelf. Good automated warehouse should follow the principles as below.  The high performance and low cost is considered. 

The main faults of reclaimer focus on the bucket-wheel and running mechanism. The bucket-wheel component of each reclaimer includes reclaiming hopper, wheel body, rollaway nest, chain wheel, tension device, actuating device, supporting roll, side roll, supporting wheel of trolley. The main fault form is the sharp wear of supporting wheel and supporting roll. The reasons and solutions are as follows: The water content of materials is large. The freezing of base and material pile would result in the rapid change of materials. The solution is making the reasonable proportion to the dry and wet materials, reducing the freezing of materials base.  If the clearance adjustment check is not done timely, the interval will be over the standard.  The solution is measuring the interval in regular time. If there is something wrong, we should arrange the related persons to make adjustment or make replacement.  The rollaway nest surface evenness of wheel body exceeds the standard, which is a

The conveyor belt is the bearing carrier and traction component of the belt conveyor(not including steel wire rope traction). The conveyor belt should have the carrying capacity and enough strength of extension. The framework and coating make up the conveyor belt. The coating is divided into upper cover glue, edging glue, and below glue. The framework of conveyor belt is made up of various fabrics or steel wire ropes, which are the backbone layers of belt bearing the total load of working. In this way, the core materials of belt should have enough strength and stiffness. The coating is used to protect the core materials from damage of harmful medium. The upper cover glue is thick, which is the bearing layer of conveyor belt. It directly contacts the materials and bears the impact of materials. The below glue is a contacting layer of belt and idler, which bears pressure. In order to reduce the resistance, the below glue layer is thin. The edging glue could protect the belt core materia

In general, the apron feeder could be divided into three types including heavy, medium, light type, which is the continuous transportation machinery widely used in mining, metallurgy, construction materials, ports, coal and industrial and mining enterprises. The apron feeder is mainly used as the storage bunker to continuously supply the materials or transfer large material to crushing machine or batching apparatus. The apron feeder is one of necessary machine for handling materials in the process of continuous production. Sometimes some EPC companies would choose stacker reclaimer, belt conveyor, stone crusher and etc to complete the transportation of materials. The light apron feeder is suitable for transporting materials under 160mm granularity in short distance. It is used for continuous feeding in mine, mill plant, chemical industry, cement, building materials. The light apron feeder could be installed horizontally or obliquely. The maximum inclination degree is 20, which is su

The conveyor belt is the bearing carrier and traction component of the belt conveyor (not including steel wire rope traction). The conveyor belt should have the carrying capacity and enough strength of extension. The framework and coating make up the conveyor belt. The coating is divided into upper cover glue, edging glue, and below glue. The framework of conveyor belt is made up of various fabrics or steel wire ropes, which are the backbone layers of belt bearing the total load of working. In this way, the core materials of belt should have enough strength and stiffness. The coating is used to protect the core materials from damage of harmful medium. The upper cover glue is thick, which is the bearing layer of conveyor belt. It directly contacts the materials and bears the impact of materials. The below glue is a contacting layer of belt and idler, which bears pressure. In order to reduce the resistance, the below glue layer is thin. The edging glue could protect the belt core mate

The stacker reclaimer is a continuous bulk materials handling equipment, which is widely used in port, metallurgy, cement, steelworks, coking plant, coal factory, power station and etc. Sometimes, the stacker reclaimer coordinates the belt conveyor, apron feeder to complete the materials handling process.  The center pillar is regarded as the center of cantilever stacker. One end is steel structure belt conveyor and the other end is balance weight. The stacker is connected with rotation device, realizing the rotation through the engaging between small pinion of rotary actuator and gear ring of large bearings. The materials entering into the round yard would be unloaded to the stock ground through the head of cantilever belt conveyor. The materials probe is set in the two sides of discharge opening. If the top surface of material pile touches the probe, it shows that the material pile has reached the designed height. The pitching of hydrocylinder is adopted by stacker, whose advant

With the rapid development of national infrastructure and industrial construction, the type of stone crusher and related manufacturers emerge in endlessly. In this way, the users have more choices. At the same time, the customers do not know how to choose the suitable stone crusher. For a gravel plant, the stone crusher with different production and function will be used to meet the production requirements. But how to choose to suitable stone crusher which would meet the production requirements?  Character of Stones The hardness, silt content and water content of stones are the important data for selecting the equipment. If the hardness of stone is large, we could choose jaw crusher or gyratory crusher. If the hardness of stone is small, we could choose impact crusher, which could save the cost and increase the production efficiency.  Requirements on Product Quality The requirements of granularity and stone shape of finished product also influence the selecting of the stone

In summer, the high temperature will bring difficulties to the usage of mining equipment. The user should prevent high temperature of mining equipment in advance. What problems will appear in summer? The high temperature of water tank and engine would result in the damage to the cooling system, hydraulic system, circuit, and tire. In this way, the use ratio of mining equipment would be reduced and failure rate would be increased, which increases the construction cost. We should do high temperature protection of mining equipment in advance.  Firstly, we should maintain the mining equipment. We should change the engine oil of apron feeder, stacker reclaimer , belt conveyor , screw conveyor . The belt should be changed or adjusted. We should check whether the performance of fan, water tank, generator, compressor is reliable. If necessary, we should do maintenance or change.    Secondly, we should increase the viscosity grade of the equipment in high temperature zone. The cooling sy

The EPC means that one company undertakes whole process of work including investigation, design, procurement, construction, commissioning (completion and acceptance) and etc from the end user. Besides, the working content, task and responsibility will be showed in the contract. Most EPC companies would know the following contents. According to the different designing scope, EPC mode has many forms including EPC with all designs, EPC with partial designs, EPC with relay mode design and etc.  Under the EPC with all designs, the user would propose the functional requirements for the future project. The EPC companies would complete all designs, purchasing, construction, pre-operation and other work.  Under the EPC with partial designs, the user need to propose the functional requirements and do some designs. The EPC companies would complete the rest of working such as detail of construction/Detail Design, purchasing, construction, pre-operation and other work.  Under the EPC with

The screw conveyor is a kind of common continuous conveying equipment without driving component. The screw conveyor is widely used in metallurgy, mining, motive power, building materials, light industry, wharf for transporting bulk materials such as coal, ores, grains, sand, chemical fertilizer and etc. The screw conveyor has many types, much architectural difference,  and many designing parameters. Besides, each parameter has interrelation and restrict, which makes the design and selection complex. We should consider following points when choosing the screw conveyor.  1. delivery capacity The delivery capacity means the volume of materials conveyed in unit interval. If the material is bulk material, it will be calculated according to mass or volume. If the thing conveyed is product in piece, it will be calculated according to quantity. If the screw conveyor is matched with linear vibrating screen, spin vibration sieve, ultrasonic vibrating screen and etc, we need to calculate

EPC means that one turnkey company is responsible for prospecting, designing, purchasing, constructing, commissioning, and other process. The working content, responsibility, tasks will be  explicitly stipulated in contract form. Internationally, project general contracting in petroleum, chemical, electric power and other industries is called as EPC. Most EPC companies would choose large project to earn money such as contracting the construction of stacker reclaimer . Sometimes, EPC companies would serve for materials handling industry such as the design and manufacturing of pipe conveyor . According to the practice at home and abroad, mature EPC companies should have following features.  The operating income mainly comes from providing project services(including project contracting and project management) to the end user.  The business range covers the total process of project including preliminary consultation, design, purchasing, construction, commission, EPC, PMC, PM and o

The automated warehouse is a kind of automated storage and retrieval system fully controlled by computer, which could take full advantage of space to realize the most stocking capacity, supermatic stocking, high speed stocking and the integration of information. In the future, the automated warehouse would have new improvement, which is preferred by EPC companies.  The automation level of warehousing and storage activities will be increased. The advanced country has obtained the large achievement because of supermatic industry and the wide application of computer. The application of computer and related controlling device would greatly increase the automation level of warehousing and storage activities. With the further development of production, the requirements of logistics system will be strict. It should be ok to supply exact products in fixed time and place according to right order. In order to realize it, the automation level of warehousing and storage activities should be in

There are many places which need the unloading of bulk materials such as specialized marine terminal, steelworks, large-scale thermal power plants, storage yard of mining. The bucket wheel stacker reclaimer is one kind of continuous conveyors. The materials could be transported according to the fixed landline with constant or variational speed. Most EPC companies would choose the bucket wheel stacker reclaimer to complete the materials transportation. In the loading and unloading operation of bulk materials, the stacker reclaimer is the main part of line production transportation. The stacker reclaimer could coordinate with other conveying equipment to make up different technological processes, meeting the different requirements of different storage yards and operation points. The apron feeder and belt conveyor are the common matching equipment. The stacker reclaimer plays an important role in bulk handling inside of ports and in materials transportation outside of ports. Besides, t

The stone crusher or crushing machine would crush materials and then the materials would reach other conveyors such as screw conveyor , belt conveyor, stacker reclaimer and etc. The conveyor components should have long service life. The crushing is the essential craft process during the process of manufacturing cement. The advanced and reliable crushing process and equipment matters in cement production. There are five common crushing methods adopted by building materials industry. They depend on the mechanical force. The stone crusher or crushing machine uses the following crushing methods.      a─crushing   b─trituration   c─hacking  d─breaking   e─shredding crushing (figure a) The materials are under the slow increasing pressure between two metal plates. When the materials stress reaches crushing strength, the materials would crush, which is used for crushing the hard block materials.     trituration (figure b) The materials do relative move among metal plates or various g

The screw conveyor is widely used in power plant, cement, mining, chemical and other industries for transporting the materials. Sometimes, the screw conveyor will be used in automated warehouse with stacker reclaimer, pipe conveyor, stone crusher and other equipment. The processing difficulty of helical blade is large, which greatly influences the performance and costs. There are three common manufacture methods of helical blade. The first one is to use special rolling brake, which is suitable for volume-production but has high requirements on equipment. The second one is cold-forming with low efficiency and bad quality of blade. The third one is hot rolling method with complex process and high labor intensity. As a professional conveying equipment manufacture, our company has obtained a new process(cold pressing method) after many years' exploring. This method is efficient and simple, which could produce the blades with high quality. The Principle of Pressing The sheet meta

The EPC is the common method for EPC companies, which is in favor of clarifying various complex relationships such as owner and contractor, enforcing authority and main market players. The advantages of EPC are as follows: The first one is Optimization of resource allocation. The foreign experience has proved that the EPC has reduced the occupancy of resources and administrative cost. In our country, the three aspects are showed. The owner is free of various affair, which avoids the waste of personnel and fund. The general contractor reduces the cost of alteration, dispute, and claim for compensation. The subcontractor's division of labor could be increased. The scale economy is easy to form. The EPC, construction contracting and subcontract could form tower structure. The unitary type of organization form could change into synthesizing type, which could integrate fund, technology, management as large enterprise groups. The market share could be extended. The government

The chain bucket ship unloader is a kind of continuous ship unloading machinery for bulk materials. It could use chain bucket to excavate materials from the ship cabin, and then transport materials through belt conveyor to the wharf. There are several advantages compared with grab ship unloader. 1. High Unloading Efficiency The chain bucket ship unloader's efficiency could reach over 65%, while the grab ship unloader could keep between 50% ～55%. The chain bucket ship unloader could change the shape of reclaiming head, which could reclaim the materials in maximum. Besides, the capacity of continuous ship unloader is larger than grab ship unloader by 20%. 2. Environmental Protection The materials could be transported in sealing condition during the operation of the chain bucket ship unloader, which would not result in flying dust. The grab ship unloader would produce the flying dust during operation. 3. Energy Conservation The chain bucket ship unloader has no frequent ac

The EPC is the common method for EPC companies , which is in favor of clarifying various complex relationships such as owner and contractor, enforcing authority and main market players. The advantages of EPC are as follows: The first one is Optimization of resource allocation. The foreign experience has proved that the EPC has reduced the occupancy of resources and administrative cost. In our country, the three aspects are showed. The owner is free of various affair, which avoids the waste of personnel and fund. The general contractor reduces the cost of alteration, dispute, and claim for compensation. The subcontractor's division of labor could be increased. The scale economy is easy to form. The EPC, construction contracting and subcontract could form tower structure. The unitary type of organization form could change into synthesizing type, which could integrate fund, technology, management as large enterprise groups. The market share could be extended. The government secto

The bucket wheel excavator does not travel when excavating the materials. The compound motion of rotating of bucket wheel and cantilever crane helps to excavate the materials. The materials would drop to the conveyor belt receiving the materials. And then the materials would be transported to conveyor belt to the transport machines. In general, the bucket wheel excavator has a long distance in aspect of technology, manufacturing level compared with advanced countries. The types and quantities could not meet the demands of open mining industry. The following problems exist.  The bucket wheel excavator and its supporting auxiliary equipment are complex. There are some limitations in the usage. The equipment is bulky. The low mobility and poor flexibility are main problems.  The digging force is small. For the large and hard rock, the direct operation is more difficult, generally not suitable for use in hard rock. The initial investment cost of bucket wheel excavator is large wit