This kind of cement transfer station is mostly used in urban construction, and it can be transported by cement tanker, which can reduce unnecessary space and time and speed up the project progress.
Extension:
A, the classification of bulk cement equipment
Bulk cement equipment involves transportation engineering and powder engineering. According to their uses, they can be divided into the following five categories: (1
Loading equipment: including unloading device, loader, dust collector, etc. (2) Transportation equipment: including bulk cement trains,
Cars, ships, containers, container bags, etc. ; (3) Storage equipment: including cement silos, transfer silos, flowing tanks and solids.
Moving device for fixed tank and flowing tank; (4) Measuring equipment: including track scale, ground scale, electronic scale, rotor scale,
Nuclear scale, belt scale, etc. ; (5) Conveying equipment: including screw conveyors, belt conveyors, hoists and various types.
Pneumatic conveying and loading device, etc.
Second, the technical status and analysis of bulk cement equipment in China
Since 1957, China has built the first bulk cement conveying control system at the site of Sanmenxia water control project of the Yellow River.
Over the past 40 years, it has been more than 40 years' efforts. It should be said that great progress has been made and some bulk cement facilities have been formed.
Equipment production capacity, according to incomplete statistics of scattered offices all over the country, there are more than 60 bulk cement facilities and equipment production enterprises nationwide.
Among them, there are more than 30 automobile factories, 6 train factories, 5 air compressor factories, ship unloaders,
There are also 19 measuring instruments from other manufacturers. Some of these facilities and equipment manufacturers have considerable strength, production technology,
Management experience and other aspects have reached a certain level. However, there is still a big gap with the technical level of advanced countries in the world.
The gap between the production, circulation and use of bulk cement in China can not meet the needs of practical application, and the problem is serious.
Restricting the development of bulk cement in China, from a technical point of view, the bulk cement equipment in China mainly exists in the following aspects.
A prominent problem:
1. Bulk cement loading and unloading control system is relatively backward. At present, the loading and unloading control system adopted in China is relatively backward. eye
The loading and unloading equipment used in China before was basically mechanical automation and instrument control, which could not load and unload materials and speed in time.
Preset and automatic adjustment.
2. The design of bulk truck tank is not reasonable, the effective utilization rate of space needs to be further improved, and the self-weight of tank needs to be further improved.
Further reduce. In addition, the fluidized bed generally adopts the microporous ventilation technology of fiber woven board, which determines that bulk trucks are not allowed.
Inevitably, with the extension of service time, the unloading speed will be greatly reduced, while the remaining quantity will be greatly increased.
Incomplete. Although many manufacturers' car calibration indicators are very advanced, after actual operation, especially after operation 3.
After 10 months, its index decreased rapidly, and some of them decreased by 50% compared with the original calibration value. It is common that the unloading time is too long and there is residue.
The number is seriously exceeding the standard.
3. As the power source for bulk carriers to transport materials, the air compressor also affects the unloading performance of bulk carriers. At present,
Swing bar air compressor is the most widely used in China, and the efficiency of domestic special air compressor is low, generally only about 65%, with energy consumption.
At the same time, the specific gravity index of domestic air compressor is 3 1 ~ 45 kg/m3, which is four times that of foreign advanced level. very important
But the compressor is heavy, so it is necessary to reduce the loading capacity of cement. In addition, the running noise and vibration of domestic compressors are compared.
Large, relatively short service life.
4. At present, the flowing tanks for bulk cement storage are generally made of iron, which is relatively heavy and requires cranes and special equipment.
The equipment is inconvenient to handle and use, and the handling cost is high. In addition, the tin can is stored in the open air, which has poor oxidation resistance, and the whole tank body
Often rust affects the appearance, and you have to pay a certain maintenance fee every year.
5. Standardization and systematization need to be further strengthened. The production of bulk cement equipment is produced with the development of bulk cement.
Exhibition and development, in the manufacturing of industrial production equipment, is a new industry. The standardization of many products has not kept up.
Production development. Such as bulk cement riser tank, bulk cement machine, bulk train loading head, etc. There is no national standard so far.
Accurate, resulting in field use can not be connected. The product structure of air compressor is not standardized, and the problem of accessories cannot be solved. Although this country
1993, the state bulk office proposed to use a unified quick standard connector for the unloading pipe of bulk cement truck, but
Due to the lack of effective measures, it is still not unified, which seriously affects the unloading speed of bulk cement trucks. In addition, the product line
The arrangement needs to be further strengthened, the equipment specifications are not complete enough, and the range for users to choose is relatively narrow.
Three, the improvement of China's cement technology and equipment and supporting capacity is an important symbol of the development of bulk cement, but also the need for the development of bulk cement.
The indispensable material basis and conditions for loading cement. The state has always attached importance to accelerating the development and application of bulk cement facilities and equipment.
1985 the State Council Guofa [1985] No.27 document provides financial guarantee for the development of bulk cement facilities and equipment; 1997
The State Council [1997] No.8 document clearly pointed out that it is necessary to speed up the production, transportation, storage and use of new equipment and technologies for bulk cement.
The development and application of technology should be standardized and serialized to increase the content of science and technology. At the same time, the development of bulk cement is also bulk.
Cement products and equipment provide broad market prospects, whether in terms of policy, capital or market space, bulk water.
Mud equipment can be said to be in an extremely favorable opportunity. Let's talk about the basic technology of bulk cement facilities and equipment in China.
Potential.
1. Improve loading (ship) technology and adopt dust-free loading equipment to reduce loading dust and labor intensity of workers.
Degree, improve the automation level of loading, measurement, production, scheduling and other links, using computer intelligent processing technology.
2. The application of spraying technology in transporting and conveying bulk cement.
Jet technology is based on the principle of fluidized differential pressure transportation (unloading), and the gasification rod is used to replace the woven fabric for fluidization.
Bed, the device plays the role of fluidized materials when there are many materials in the tank, with small resistance and no blockage; When the material is less, it is porous and consolidated.
The directional jet forms an air cushion, which sweeps the residual materials in the tank to the front of the feeder, so that the feeder sucks the paper roll and realizes cleaning.
Present situation of residual materials. A positive and negative pressure converter is added in the tank to replace the original discharge pipe. When the material is long, you can press
The air pressure and distance are automatically adjusted to the optimal mixing ratio and transported to the predetermined position efficiently; If there is less material, it will become negative.
In the pressure suction state, the materials cleaned by gasification sweeper are sucked to the discharge pipe. This technology solves the problem of air permeability of flat micropores.
The resistance of the material itself is large, and the condensation causes the powder to harden and agglomerate.
3. The bulk cement flowing storage tank is made of FRP made of polymer materials instead of steel. make steel
The flow tank is bulky, inconvenient to carry, poor in oxidation resistance and seriously corroded when placed in the open air. And glass fiber reinforced plastic
The material is light in weight, easy to carry, strong in oxidation resistance, simple in manufacturing process and low in cost. Although China's glass and steel products
There is still a gap in strength and hardness between China and foreign countries, that is, it is very mature, but glass fiber reinforced plastic is used for bulk cement.
Storage and transportation are still feasible and will eventually replace steel.
4. With the rapid development of highway and bridge construction in China, the performance of automobile chassis has been continuously improved, and the structure of bulk cement truck has gradually taken shape.
The model develops to semi-trailer mode, and the loading tonnage develops to heavy type. Requirements of semi-trailer and heavy truck on pavement
Higher, but the transportation cost per ton kilometer is very low, and the transportation radius is enlarged. According to statistics, semi-trailer is used for transportation, per ton kilometer.
The transportation cost only accounts for 20% of the whole vehicle, and the fuel only accounts for 60% of the whole vehicle.
5. Whether the measurement of bulk cement is accurate in the process of transportation, transit and use not only affects the economy of both supply and demand.
Benefits, but also affect the progress and quality of the project. The new type of bulk cement truck scale introduced and developed in China has basically solved this problem.
The problem of bulk cement load measurement is solved, and the problem of inaccurate measurement caused by long-term vibration fatigue of vehicles is overcome. not have
Whether the vehicle is dynamic or static, the weight data can be displayed on the instrument. In addition, dynamic electron metrology of WGY powder materials.
The device has been successfully developed and put into use. The device consists of a feeding system connected with a cement moving tank, electronic feeding processing and electronic metering.
Monitoring system, electronic display and computer data processing system are dynamic instruments that can realize quantitative and non-quantitative output.
Quantity, which can be used to measure the loading quantity and flow rate of flow tank.
6. The acceleration of serialization and standardization of bulk cement equipment will greatly facilitate users' choice.
Wider range, more varieties to choose from, interchangeable accessories, universal and easy to maintain.