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 accelerating and decelerating, starting and braking, whose power consumption is reduced by 30% compared with grab ship unloader. 4. Small Follow-Up Investment The chain bucket ship unloader could reach the rated capacity. If the rated capacity is 3 000 t/h, the following belt conveyor, stacker reclaimer's capacity is 3 000 t/h. While the grab ship unloader's related equipment need to reach 3 600 t/h. The cost is so high for EPC companies. The ship loader has similar function as ship unloader. In the following articles, the ship loader would be introduced in detail.
0 Comments
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, apron feeder 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 grinding bodies, under the shear force. When the material stress reaches the ultimate strength, the materials are attrited. This is used for the grinding of patch material. hacking (figure c) The materials are extruded between metallic surface with cuspidal edges and then fissure appears. If the tensile stress reaches tensile breaking points, the materials are hacked. It is used for brittle materials. breaking (figure d) The materials are broken between metallic surface with beads. The materials have curving. When the stress reaches the transverse modulus of rupture, the materials breaks. It is suitable for breaking brittle materials. shredding (figure e) When the materials suffers the external impact force, the kinetic energy quickly turns to deformation energy of materials. If the crushing methods could not be selected properly, the crushing effect would be influenced and the energy consumption will be increased. 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 metals produce the tensile plastic deformation in axial and size contraction in radial under control of the mould, which could guarantee the precision and forming of the blades. Mold Design The key of cold pressing method is the mold design. The mold structure should meet the requirements of accuracy and guarantee that the unfolded material could smoothly slip into the mould cavity. Besides, the tensile plastic deformation in axial and size contraction in radial could be completed without any errors. There are many advantages as follows. The efficiency and workplaces precision are greatly increased. The working environment is improved and the labour intensity is reduced. The helical blade has better quality. The energy consumption is reduced, which saves costs. In following blogs, the technology of pipe conveyor will be referred to. 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 sector could break the trade monopoly. In this way, it can solve prominent problem of construction market, realizing the risk guarantee. The building cost of projects could be controlled easily, which promotes the level of bidding. For example, most EPC companies have access to controlling the building cost of automated warehouse, stacker reclaimer, belt conveyor and etc. For the conveyor components, the cost will be controlled in plan. The management modernization could be realized. The computer system is built to realize the electronization, informatization, automation and normalization, which enhances the management level and efficiency. The main Scraper belt conveyor is a kind of large conveyor device, using the traction of scraper chain to convey bulk material in the tank. Scraper conveyor is consisted of the headpiece, the middle part and the tail part. According to the arrangement and structure of the chute, scraper conveyor can be divided into two types: parallel and superimposed. According to the number and arrangement of the chain, it can be divided into single chain, double chain, double center chain and three chain. In generally, the stacker reclaimer will coordinate with the belt conveyor, apron feeder to complete the materials handling. Pipe conveyor is the upgraded one for the belt conveyor. Scraper conveyor can be used for horizontal transport and tilt transport. When transported along the inclined upward, coal bed pitch should not exceed 25 degrees. When downward transport, the angle should not exceed 20 degrees. When the coal bed pitch is larger, the anti-skid device should be installed. The curved scraper belt conveyor is allowed to bend about 2 to 4 degrees in both horizontal and vertical directions. The open chute is as the supporter of coal, waste rock and material, then the scraper conveyor immobilize the blade on the chain(consisting scraper chain) as the traction component. When the head drive starts, scraper conveyor rotates with the chain wheel on the headpiece. This makes the chain keeps cycle operation along with the chute until the headpiece unloads. Scraper chain does the closed cycle operation bypass the chain wheel to complete material transfer. The main parts of the scraper conveyor are: scraper blade, chain wheel module, middle trough, dumbbell module, chain wheel, clapper, sub chain, middle trough, reduction box, sprocket shaft group, E type bolt, ring chain, dumbbell pin, derailleur, guard board, belt pulley, guild board and etc. The cement plant needs to reduce the production cost and energy consumption. The large scale development has become a must. The large stone crusher has many features such as large reduction ratio, high efficiency, high degree of automation, simple technological process and etc. The demands of enlarging production scale could be met. The enlargement of stone crusher leads to a lot of problems such as manufacturing, difficult transportation, economic benefit and etc. From the development of stone crusher, there are extruding stone crushers such as jaw crusher, cone crusher and roll crusher. Then the impact crusher is created including vertical type, hammer type. With the development of crushing technology, some mechanisms of action are applied during the design and manufacturing of crushing machines. The jaw crusher uses impact mechanism of action. The hammer crusher use the inter-collision mechanism of action. In fact, there is a certain limitation in the actual practice. More and more people agree to the rift theory. As the theory is fined time by time, the fracture mechanism and related equipment would get the large breakthrough. In generally, when the stones are handled by crushing machines, they would be transported by belt conveyor and then handled by stacker reclaimer. 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 sector could break the trade monopoly. In this way, it can solve prominent problem of construction market, realizing the risk guarantee. The building cost of projects could be controlled easily, which promotes the level of bidding. For example, most EPC companies have access to controlling the building cost of automated warehouse, stacker reclaimer, belt conveyor and etc. For the conveyor components, the cost will be controlled in plan. The management modernization could be realized. The computer system is built to realize the electronization, informatization, automation and normalization, which enhances the management level and efficiency. As we all know, the mining equipment includes apron feeder, belt conveyor, stacker reclaimer, rotary kiln, crushing machine, magnetic separator and etc. Here, the apron feeder's fault solution will be introduced. Equipment trouble The relative rotation between the transmission shaft of the apron feeder and the hollow shaft of the reduction box leads to the abrasion. Reason analysis Due to the long-running, metal material would produce metal fatigue, changing from elastic deformation to plastic deformation, so there is a gap between axle and the fitting surface of the inner race, which leads to abrasion. In the process of the operation, due to the insufficient lubrication or cooling, bearing will become heat. The increasing operating resistance would result in the erosion of bearing. The bearing will bend or even break because of the durable years, the increasing gap and the metal fatigue. The solution of the traditional handicraft Repair welding machine: difficult installation. Brushing electroplating: large limitation of the coating layer thickness which overs 0.3mm, low efficiency, easy to fall off the brush coating, short service life. Thermal spraying technology: difficult transportation, low efficiency, long period, high cost, easy to stress thermal concentration of the axle. Replace new parts: high cost of assembly unit. Belt conveyor is a kind of the economic and modern transportation equipment with long history. In its 200 years of history, pipe conveyor occupies an important position in the conveyor. Due to the requirements of environmental protection in the world is more and more urgent, since 1972 the pipe belt type conveying machine since the birth of all walks of life come into use among them, the most common is the stacker reclaimer and apron feeder. The pipe belt conveyor belt in the conveying process suggests that exist in the pipe, conveying material on the frame. The material feeding section from the tail of the hopper into the conveyor belt, by a flat deformation type U again After the transition gradually into tubular material, wrapped and sealed operation. Transported to the head of filtration, the tubular belt is unfolded from U shape into flat, the material is removed. The bearing, the return process can form a tube or run in parallel form.
Since twentieth Century, the green design has become a major theme of the EPC companies . The so-called green design refers to the quality assurance function of products, cost, under the premise of considering the environmental impact and resource efficiency of modern manufacturing mode, it makes products from design, manufacturing, use to scrap the entire life cycle of the products produced environmental pollution or environmental pollution minimum words, conform to the requirements of environmental protection, no harm to the ecological environment or harm little, saving resources and energy, the resource utilization rate is highest, the lowest energy consumption in China. Our country promulgated the cleaner production promotion law in 2003, cleaner production is to take design improvement continuously And the use of clean energy and raw materials, the technology of advanced technology and equipment, improvement of management and comprehensive utilization and other measures to reduce pollution from the source, improve resource utilization, reduce or avoid production, generation and emission of pollutants in the process of service and product use, to reduce or eliminate the harm to human health and the environment. The pipe belt conveyor is shouldering the historical mission. In the process of conveying materials, the materials are circular pipe conveyor belt wrapped up, avoids the material due to a variety of causes of waste and air pollution, really play an important role in environmental protection. The pipe belt conveyor will boom in twenty-first Century. The appearance of the invention patent of Chinese pipe belt conveyor has solved the problem of vertical transportation and small turning radius, breaking through the two-dimensional mode of transport, promoting the development of pipe belt conveyor. Facing the increasingly serious global environmental protection, the protection of the ecological, to prevent dust pollution, and circular economy superiority in the transport, the pipe belt conveyor will appear in prosperity. The screw conveyor is widely used by coal, building materials, chemical industry as a continuous conveyor department of food processing and machinery etc., suitable for horizontal or inclined conveying powder, granular and small bulk materials, such as coal, coal, cement, grain, EPC companies often with a belt conveyor, stacker reclaimer, apron feeder the use of with the use of heavy plate feeder, screw conveyor in life depends mainly on the spiral blade life. The spiral blade mainly stretch forming, rolling molding, die casting, extrusion molding, molding method for different section shape of spiral blade, large The majority of methods to obtain the same thickness of spiral blades, analysis and study of the working conditions of the spiral blade on the development of spiral blade forming methods, increase the wear resistance of the blade is essential. The spiral conveyor leaf without wear, against the cylinder wall, the sealing ring for drive shaft support, keep the center position of the cylinder. The screw conveyor shaft rotating in the cylinder wall, the wall bound swing is small. Parts of the sealing force uniform screw conveyor drive, the drive box effective sealing. Blade wear, when rotating lost binding cylinder wall of the blade, the swing range increased. The helical blade abrasion of the shaft under the action of gravity to a certain tilt, the upper wall of the spiral shaft gap distance increase, the lower clearance decreases. That is the heart line screw shaft down tilt, resulting in the increase of the upper seal the ring cavity, the lower ring cavity gap Small, the sealing and oil ring driving sites caused certain extrusion. When rotating form grinding, lead to wear copper sleeve. And copper sleeve wear, to further increase the drive shaft center line. The magnitude of settlement and inclination of blade wear is exacerbated, and the gap between the upper wall of the cylinder is further increased. When the effective elastic range of the gap between the more than sealing in the seal cavity. It contains into the muck muck into the gravel and intensify the seal wear. Eventually driving box is polluted. In order to prevent the problem of screw conveyor blade wear and driving box pollution, influence of the screw conveyor working efficiency and service life of the screw conveyor blade and other parts easy to wear resistant material spraying, it can not only protect the machine equipment materials by water erosion, cavitation erosion, can prevent the body from corrosion. It is the key to select the suitable wear resistant material with high wear resistance and wear resistance before the wear resistance of the material. |