Design Points and Application of Belt Conveyor in Large Port- Jiangyin Huadong Machinery Co., Ltd

With the development of the national economy, the volume of bulk dry bulk cargo such as coal, ore, sand, bulk grain, fertilizer, etc. in water transportation is increasing year by year, and the tonnage of transport ships is becoming larger and larger, so the loading and unloading equipment is also developing in the direction of large, efficient and low energy consumption. Port transport machinery plays a key role in the specialized terminal of bulk cargo, and belt conveyor, as one of the important components of port transport machinery, lays the foundation for the reliable, efficient, energy-saving and economic operation of port transport machinery. Combined with the process requirements and characteristics of port transportation machinery, the design points of port belt conveyor are highlighted and the application situation is briefly listed.

(I) port transportation composition and typical process:

Port transport machinery mainly includes continuous transport machinery, port handling machinery, auxiliary equipment three categories. The continuous conveying machinery is mainly belt conveyor;

Loading and unloading machinery mainly includes all kinds of ship unloaders, ship loaders, car unloaders, car dumpers, stacker-reclaimer, etc;

Auxiliary equipment mainly includes storage, feeder, metering device, iron removal device, various protection devices, etc.

According to the different uses of the port, based on the belt conveyor, the configuration of different loading and unloading machinery can be built into a considerable capacity of the import and export terminal loading and unloading conveyor system, a system generally has several processes, the typical port loading and unloading conveyor process is the following:

1) Unloading (ship) ----- stacking process;

2) reclaim ---- loading (vehicle) process;

3) Material reclaim-delivery process to the user;

4) Unloading (ship) --- loading (ship) straight take process;

5 Unloading (ship) --- direct transfer process to the user unit;

(II) port belt conveyor design requirements:

(1) Determine the reasonable reprint mode and put forward the requirements of feeding device and unloading device;

(2) straighten out the relationship between the belt conveyors of the conveying system. According to the starting sequence, the feeding conveyor moves 1st, and the stopping sequence is the feeding conveyor stops 1st. When the parameters of the conveyor are different, the requirements for starting and stopping time are put forward through this relationship;

(3) When the above start-up and stop sequence requirements cannot be met, it is necessary to consider adding a buffer silo between conveyors to improve the adaptability of the system and the operation rate of the system;.

(4) Environmental protection requirements, for the case of large dust to consider the use of closed transport or set up the necessary dust and other equipment;

(5) Standardization and generalization of parts and components and availability of wearing parts;

(6) Select the conveyor with the inclination angle adapted to the process requirements. According to the material characteristics and working conditions, the conveying inclination angle is allowed to be 15 ° for upward transportation and 10 ° for downward transportation;

(7) The tape sag between adjacent idlers shall not exceed 1%;

(8) When the belt conveyor is braked, the max. working tension should not exceed 1.5 times the working tension during normal operation;

(9) The design of the curvature radius of the concave arc section of the belt conveyor should meet the requirements of no-load starting, the belt does not break away from the roller, and does not produce the phenomenon of streamer;

(III) port belt conveyor design content and basis:

The design content mainly includes conventional belt conveyor design, dynamic design, resonance avoidance design, component design, electrical and control system design, etc. Before the system design, the requirements for equipment should be fully understood, mainly based on the conveying volume. When the material flow is uniform, it can be given directly. Generally, it should be designed and calculated according to 10% of the overload capacity, unless otherwise agreed. Detailed dimensions of the transmission line, mainly including the max. length, inclination angle, lifting height and connection size. The nature of the material; the main parameters are loose density, resting angle, material particle size and max. block degree, material humidity, wear, adhesion and coefficient of friction. Working conditions and environmental conditions; ambient temperature, place of use, environmental protection requirements, etc. Feeding and unloading methods, running time, working days, service life and other requirements, according to the design requirements, in particular, carefully weigh the selection of the max. sag, simulated friction resistance coefficient, conveyor belt and roller friction coefficient, conveyor belt safety factor and other parameters that have a great impact on the stability, safety and efficient operation of the conveyor system.