Different stone crushers create a bright scenery line. The workers in this industry should pay attention to selecting the stone crusher. Some tips about selecting stone crusher are as follows. Hope these tips could be helpful to all the friends.
At first, the environmental protection principle should be considered when choosing stone crushers. We should check whether there is energy-saving setting, not only the energy-saving setting for one machine, but also the energy conservation of system. The machine with features of low noise and less dust is the first choice for us. Secondly, we should choose the stone crusher with simple structure. Why choose simple stone crusher? If the stone crusher has something wrong, the maintenance would be simple. If the application is good, this is a good choice. According to the structure and operating principle, there are jaw crusher, impact crusher, hammer crusher, gyratory crusher and crushing mill. And for each type, there are different specifications. Before choosing stone crushers, we should confirm the exact model according to some parameters such as material properties, granularity, application of force and etc. The competition in crushing industry is so fierce. There are various crushing machines. Many customers have doubt about the products and do not know how to chose the suitable products. It is necessary to know some basic information about crushing machine. For the other equipment, we should also have above principle to select the suitable products such as belt conveyor, reclaimer, conveyor components and etc.
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EPC project's main advantage is the integrative operation including designing, purchasing, and construction. We could not separate these three items. We should integrate them to get the good effect. This is very common for EPC companies including project of stacker reclaimer, belt conveyor, screw conveyor, apron feeder and etc. The purchasing work should guarantee the quality, quantity, time of the project. We should receive required equipment, materials and related service through the reasonable price and proper supplying sources. During the implementation process, the professional persons should carry out the purchasing process. Through the standard purchasing working routine, intelligent management on contract and information management, the purchaser should meet the working of purchasing management. At the same time, the following points should be met.
1. Purchasing in good time: This could influence the long period of whole project progress and key equipment. The purchaser should order the products as soon as possible. The purchasing work should be carried out according to the progress plan. 2. Purchasing in proper place: Considering the currency rate change could help purchaser confirm the supplier in some areas, realizing the purpose of reducing cost. If the large equipment is hard to transport, the purchaser could consider the installation on site. 3. Purchasing in good quality: The purchaser should choose reasonable product with good quality to increase the purchasing benefit during the assessment process of confirming the supplier. 4. Purchasing in proper quantity: The purchaser should reduce the quantity of purchasing contract, combining similar products in one contract. In this way, purchasing management becomes easy. For EPC companies, they should remember above points when purchasing stone crusher, pipe conveyor, and other equipment. The market economy has been confirmed in China. The development of technology would be restricted by the market. However, the market is not mature, which is not only restricted by the demands. Especially for the automated warehouse project, the fund has become the most important thing. As the all walks of life develop, the automated warehouse has received a great success. In the future, stone crusher, stacker, belt conveyor, pipe conveyor and apron feeder will be listed in the production line to coordinate the transportation and management of materials. With the enlargement of the market, the automated warehouse with high grade management will pour out in the market. The designing of logistics system is so important for the future development of automated warehouse. The goods shelf with better manufacturing technique will be improved and developed. The technology of automated warehouse will be renewed with the development of the market. At the same time, most EPC companies of automated warehouse would be helpful to the development of the automated warehouse technology. Seeing from the design, manufacturing, and usage of automated warehouse, the advanced country leads the way. The introduction, digestion, absorption and transformation of foreign advanced technology is a best shortcut. However, what is important is that we should choose the suitable technology and do not need blind introduction. Some points should be mastered when we introduce some technology. We should introduce the practical product; The fast digestion and absorption of the technology is very important; The domestication will be a must, which prevents imported parts for a long time; The current market demand and future market demand should be considered. If the above points could be realized, then the introduction is successful. The design prototype of bucket wheel stacker reclaimer is the excavator. They are alike in the aspect of structure and design principle. However, the working environment is so different. The bucket wheel stacker reclaimer consists of bucket-wheel device, cantilever crane, superstructure, swing mechanism, revolving platform, running gear, gate seat, belt conveyor and tripper car. There are many types including cantilever type, gate-type, and bridge type according to the application structure. There are crawler-type, rubber-tyred, and rail-mounted according to the mode of operation.
The best feature of stacker reclaimer is the high working efficiency. The excavator and carrying machinery could not work together. The crawler-type operating mode limits the operating speed, which is the reason that the excavator has a low efficiency. The stacker reclaimer could operate according to the fixed route, which reduces the conveying time. Besides, the fault rate of this mode is very low, which reduces the transporting cost and maintenance fee. At the same time, the unnecessary loss of fault could be avoided. The construction cost is so low with small consumption. That explains why the stacker reclaimer is so popular in domestic and foreign market. The higher requirements on stacker reclaimer are proposed to meet the development of technology. However, our country's technology is not advanced. The advanced country carries the monopoly of techniques. For this, every technology worker should be positive to develop new technology to make a contribution to country, especially the research on technology of stacker reclaimer, belt conveyor, apron feeder, screw conveyor, stone crusher and etc. The underground metal mining's history is so long. Three thousand years ago, the Chinese people started to mine copper. And two thousand years ago, the normative mining technology has occurred. In modern times, the underground metal mining technology was in state of backwardness. The manual work is the main method of mining. Until to the 1950s, the underground metal mining technology developed rapidly. In recent years, science and technology researches about mining method are carried out in China. We have gained much achievement in intermittent-continuous mining, stage large diameter deep hole mining, sub-deep hole mining, deep-seated mining, natural caving mining, leaching and mining, high-efficiency mine filling, rock support and reinforcement, mine control water, open-pit mining equipment and underground mining equipment. The technological level has been promoted with two main methods including opencast working and underground mining. The stone crusher, apron feeder, stacker reclaimer are applied to handle and convey the ores. The opencast working is a process that some ores mined need to be conveyed by stacker reclaimer and belt conveyor. Open-pit mining can be divided into open-pit metal mining, open-pit coal mining, and open-air iron ore mining. The open-pit metal mining mainly mines non-ferrous metals. The open-pit coal mining mainly mines coal and some non-metallic ores. The open-air iron ore mining mainly mines iron ore. We should consider the geological conditions of the deposit, mining technical conditions and economic factors to meet the safety, economic, efficient and high quality requirements when choosing the mining methods. There are four common stone crushers in mining industry including jaw crusher, gyratory crusher, impact crusher and baffle crusher. The jaw crusher is suitable for the coarse crushing and secondary crushing of hard rock. The principle of jaw crusher is that motor drives the belt and belt pulley, which forces motive jaw move to realize the purpose of crushing machine. With the continuous rotation of motor and periodic movement of motive jaw, the volume production could be realized . The jaw crusher is used as the first crushing machine in production line(coarse crushing). The gyratory crusher could be used for the secondary crushing and fine crushing of ores with higher hardness and medium hardness. The motor forces the eccentric bushing to rotate through driving device. The materials are crushed through many times' impacting. The baffle crusher's rotor rotates in high speed through the driving of motor. When the materials enter into the impacting area of board hammer, the materials are crushed and then threw to the impacting device. Over and over again, the materials handled could be discharged until the materials' granularity could reach related standard. This baffle crusher's production could be used for the building stones of high-grade highways, hydropower, building and etc. The impact crusher could be called the sand making machine. The large centrifugal force make the materials crushed in manifold cycles. The materials handled by impact crusher has fine particle shape and could be used in the production of aggregate in sand making and high-grade highways. In general, the apron feeder, screw conveyor, stacker reclaimer, and belt conveyor could be used to handle materials crushed by stone crushers. The payment terms in EPC project are very complex, especially for EPC companies supplying stacker reclaimer, apron feeder, belt conveyor and other large materials handling equipment. According to the time, there are advance payment, interim payment, provisional acceptance, guarantee period and etc. For each stage, we should meet the payment conditions required. Especially for interim payment, it will involve in civil engineering, supply of equipment, installation, training and etc. Because of different content, we may meet some restrictions in payment terms. Some payment may involves in the change in workload, the change in working range, the change in price and change in payment because of fine. So the main contractor of EPC companies should fully understand the meaning of payment terms and have capacity of calculating the amount of payments. Otherwise, even if the main contractor completes the whole working of project, he may could not get all the payments from the owner.
In addition, the general contractor should study how to calculate cash flow based on the payment terms. Some contractors have got the payment from the owners, but do not want to pay to the subcontractor. They think late payment is safer and can get a certain interest income, not knowing the subcontractor have convey payment of high interest and possible payment risk to general contractor by raising the price all passed on to the total package, which greatly increases the cost of subcontracting. Therefore, the general contractor must be soberly aware that the excessive protection of their own needs to pay the cost of the price. Only the rational use of the preparation of funds, could the owners of payment and subcontract payment be the organic combination, as far as possible to reduce their advance funds. The leaking coal of belt conveyor is very common, which increases the working sum and water quantity of washing. There are many reasons about leaking coal. There is leaking coal in forwarding station. If the belt conveyor design for guide chute has problem of small flow capacity, the coal would leak from the guide chute. For the above problem, we could increase the height of guide chute and install arched cover plate to control the load capacity of coals. The leaking coal would appear when the coals are in the hollow belt section. The belt has left the trough roller unit, the coal would leak because of small groove angle. In order to solve this problem, we should be better to adopt the hollow belt with large radius of curvature to avoid the leaking. Besides, we could install pinch roller at the large radius of curvature point to avoid the hollow belt. The deviation of belt would result in the leaking coals. If the deviation of belt occurs, the two sides of belt would have two heights, which makes the coals leak. This problem could be solved through adjusting the deviation of belt. Belt Conveyor is a general mechanical conveying equipment, which is common in the power generation industry. To ensure that the belt conveyor runs in good condition, maintenance personnel should have a good maintenance process and quality standards, while the daily maintenance and maintenance of coal handling equipment is also very important. We should gradually accumulate the experience of the use and maintenance about belt conveyors in our daily work. At present, the belt conveyor and other equipment including stacker reclaimer, screw conveyor, pipe conveyor have been applied in automated warehouse. The daily checking on equipment is very important for maintenance persons. The pulley is regarded as the transmission mechanism of belt conveyor, also one of the conveyor components. It has many advantages and features, with bright prospect. Because of some limitations on power parameters and technical reason, the pulley of belt conveyor design has a series of problems, which limits the development of conveyor pulley. The drive pulley is the spare part of belt conveyor, which conveys power and torque. In the actual belt conveyor design, we should carry on the intensity check and force analysis to the pulley. As a result, during the design of drive pulley, we should fully consider the structure of transmission shaft, support, load and other factors, simplifying the structure and building suitable mechanical model. The bend pulley is used to change the operating direction of the conveyor belt. Besides, the bend pulley could compress the belt, increasing the rubber coating with drive pulley. The slipping between belt and drive pulley would result in the wearing of the conveyor belt. If serious, fire accident will occur. The add of bend pulley could prevent the slipping.
The pulley design of belt conveyor has technological difficulties, which limits the stable operation of belt conveyor. The optimization design for the conveyor pulley is imperative. During this process, we could take full advantage of present technology, analyzing the problems of belt conveyor to find the final reason. With the continuous development of the conveyor industry and technology innovation, EPC companies should strengthen the innovation and improvement of conveyor pulley design. At the same time, EPC companies should pay attention to other materials handling equipment's design such as stacker reclaimer, screw conveyor and pipe conveyor. The technology innovation is very important at present. The EPC project includes the design and purchasing. When signing the EPC contract, the EPC companies only give the description of the project function. The exact scope of purchasing and specifications could not be showed in contract, which puts hidden danger in the future.
As the general contractor, he should protect himself through exact terms in contract. The problem easily neglected is spare parts carried in EPC contract. Because the spare parts could not be confirmed when signing the contract, some owners put forward part lists and quantity according to reference project. However, the general contractor would find that the equipment confirmed by bidding will be different from EPC contents. There will be the following several situations. The spare parts required by owner is not suitable for actual equipment. The spare parts matching with equipment are not listed in the contract. The quantity of spare parts listed in contract are different from the actual demands. What's worse, some general contractors signed the contract with the owners without confirming the quantity and models. They think the spare parts supplied could meet the demands of the owner, while the customer could not be satisfied with the quantity of spare parts supplied by contractor. So the negotiation between them starts. The general contractor could solve this problem through the contract showing that the spare parts could be supplied for free during the guarantee period not listing the specified spare parts and related quantity. It is very common in the supply of materials handling equipment including stacker reclaimer, belt conveyor, screw conveyor, pipe conveyor, apron feeder, crushing machine and etc. |