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Comprehensive Control of Transfer Station in Coal Transportation System
author:none pubdate:2019-01-29 views:222
    Transport point technology affects the efficiency of material conveying, the service life of equipment such as belt, the working environment of the station, the safety of system operation and the running cost of the system. The design of "head and tail" and "receiving and blanking" of belt conveyor has attracted more and more attention of designers and production operators. The quality of the design of "head and tail" and "receiving and blanking" of belt conveyor has also attracted more and more attention. Quantity directly affects the efficiency of belt conveyor operation and the environment of transfer station. 3-DEM transfer point technology improves the belt by optimizing the design of head funnel and chute, eliminating dust and material overflow by reducing impact through reducing speed, ensuring good receiving point to avoid belt heavy load deviation, prolonging the service life of various parts of the conveyor system, ensuring system output and reducing system maintenance. Conveying efficiency.
    Discrete Element Method Conveying Technologies (DEM) consists of head collector diversion device, anti-plug diversion device, streamlined chute and feeding key system, collector damper device for collecting flow and restraining induced wind, buffer bed for balanced support of blanking point, modular fully sealed (or double-sealed) conductor for improving sealing grade. Material trough, belt deviation diagnosis and control system for ensuring tape centralized operation, dust control powerless dust removal unit, professional belt backhaul material cleaning system, patent technology debris removal system and patent flexible vibration control system for preventing material clogging can be solved by optimizing the system to solve the problems of large dust, serious blockage, belt deviation and spraying at the transfer point. The design of the system ensures the efficient and smooth transfer of materials, the cleanliness of the transfer station and the safety of the system. 3-DEM transfer point technology fundamentally optimizes the site environment and improves the safe and economic operation level of material transportation.
◆  3-DEM Transfer Point Technology for Dust Control of Bulk Materials
    The key to dust control at 3-DEM transfer point is to design 3-DEM chute by using "dispersed material gathering technology". By collecting and transporting materials, the falling speed of materials can be delayed to a certain extent. By reducing the impact between materials and equipment, dust generation can be reduced from the source, and the necessary damping system can be designed through the change of material flow direction, the change of chute section and the design of damping system. Reduce the generation of induced wind, by improving the sealing characteristics of the guide trough and installing a non-dynamic inertial dust removal unit in the guide trough, ensure that when the induced wind speed at the outlet of the guide trough is reduced to less than 2.5 m/s, the dust at the outlet is very little, thus achieving the "treatment of both the symptoms and the symptoms".
◆  3-DEM Transport Point Technology for Blocking Material Treatment of Bulky Material
    There are two kinds of blocking materials in chute, impact blocking and hanging blocking, among which impact blocking is the most common and has the greatest impact on the operation of conveying system.
Impulsive plugging is mainly caused by the large impact angle between material and chute in the process of chute transportation. When the water content of material is high, the impact angle between material and chute is more than 30 degrees, the current plugging will easily occur.
3-DEM transfer point technology guarantees that the impact angle of materials in the complete conveying system and chute is less than 30 degrees by optimizing chute structure, ensures the collection and fall of materials, reduces the impact and avoids the accumulation and blockage of materials.
Streamlined chute is used to change the traditional rigid vibration to flexible vibration for the material conveying system which may be seriously blocked. Flexible connection and spring suspension system are used for the upper and lower chute, and resonance is realized through limit spring to improve the vibration efficiency. Vibration control system sets vibration time and vibration interval by PLC, realizes automatic timing vibration, and prevents accumulation of material.
◆  3-DEM Transport Point Technology Used to Control the Deviation of Bulk Material Belt
   For the control of tape deviation, the guiding principle of 3-DEM transfer point technology is to ensure that the return tape does not deviate, to ensure that the tape is in a very positive position after the tail drum through the design and installation of deviation correction device, and then to ensure that the tape does not occur heavy-duty deviation through the design of blanking point. If the belt does not deviate when it is unloaded but when it is overloaded, it is the deviation caused by the improper blanking point that we usually say. Serious deviation must be solved by changing the blanking point. By optimizing the system of the chute system with 3-DEM technology, the phenomenon of deviation can be eliminated fundamentally.
◆  3-DEM Transfer Point Technology Used for Wear Protection of Chute
    The wear failure of liner in curved chute includes various complex wear mechanisms. The role of material in the complex movement of chute includes abrasive wear, corrosive wear, fatigue wear and erosion wear. Different wear conditions have different wear principles and different requirements for material properties. The impact and fatigue wear of material are the main failure reasons. By combining three-dimensional design with EDEM simulation analysis, the impact angle of material on all parts of chute is ensured to be less than 30 degrees. Through EDEM simulation analysis, the wear position and wear strength of material on chute can be accurately determined. On the premise of equal life design principle, different lining material combinations are selected to ensure the long life of chute lining and reduce its operation. Maintenance cost.
Based on the principle of equal life design, it is not the best choice to choose any single kind of wear-resistant material with single specifications. Different material combinations should be optimized according to the different characteristics of conveying materials, different wear forms of different parts of curve chute and impact magnitude of drop, so as to achieve long life, equal life and economy.
◆  Application of Non-power Dust Removal Diversion Tank
    Part of the high-speed induced air enters the circulation area through the blocking curtain, and the other part of the over-circulation pressure relief device relieves pressure and changes the direction of wind. The induced air at the outlet of the device and entering the circulation area forms a confrontation, thus reducing the wind speed. At the same time, this part of air can promote the local circulation of dust in the circulation area, and then through the circulation dust-reducing area, the secondary circulation speed can be reduced, and finally through the S-shaped arrangement. Dust is retained in the labyrinth dustfall area of the lifting curtain, so as to achieve the goal of low outlet wind speed and small dust.
    The material trough adopts double sealing structure and enlarges the volume of the material trough to effectively reduce the wind pressure in the material trough. The structure is as follows: Polyurethane wear-resistant liner is used in the inner side of the side plate of the guide groove, the liner can be adjusted up and down, the lowest distance of the belt height is not more than 5 mm, which can be used as a first-class seal; the outer side plate of the guide groove is installed with a super high molecular polyurethane anti-overflow skirt pendulum, which can be used as a second-class seal, and the anti-overflow skirt pendulum is a double-layer elastic seal to ensure
    A 3-DEM tail sealing device is installed at the inlet position of the tail guide groove of the belt conveyor. The multiple sealing structure ensures that the dust can not be ejected from the tail.
    Double-sided rectangular bracket structure is adopted at the lower part of the guide groove. Double-sided rectangular wear-resistant bracket is arranged around the material point to prevent the material from jumping and improve the sealing grade. Ultra-high molecular polyethylene material is used in rectangular bracket, which can be used on both sides to improve the service life of components.
    3-DEM technology and products can fundamentally solve and improve the dust, material clogging, belt deviation, belt tearing, low belt output, frequent trestle washing, high energy consumption, serious equipment impact damage and noise at the conveying and transporting points.
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