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In the port of loading and unloading belt machine is the professional bulk material conveying equipment, mainly used in coal, iron ore and other bulk cargo stack, fertilizer, grain and other goods conveying filling. It has the advantages of convenient use, high efficiency, easy to realize automatic control, etc., belt machine can work correctly to ensure the normal production of the port has important significance. Therefore, the normal use of the belt machine becomes the important work in the port equipment management.
Conveying belt deviation is the most common fault belt machine operation process, the harm is great, from the point of view of practical operation, the effect of deviation of belt running even production mainly the following aspects:
A. has the deviation caused by system failures affect the production efficiency of machine. When the belt deviation reaches a certain level, the belt will trigger is used to prevent partial emergency stop device, caused by the operating system shutdown, the impact of the production process.
B. the abnormal damage to the main parts of the equipment. First, the deviation of the belt to drum, roller bearing axial force resulting from the increase of channeling of the roller shaft, a roller bearing damage; secondly, belt deviation caused by material spilled to return belt, belt and roller caused non normal wear and tear, shorten the service life of the roller and belt; in addition, belt deviation at runtime and stent occurred non normal friction, resulting in belt edge wear, affect the service life.
C. easy to form a security risk. Due to the serious deviation of belt, resulting in belt rolled material, which makes the leather belt unilateral by force exceeds the belt longitudinal tensile force, causing the horizontal belt tearing and other security risks.
D. pollution environment, the quality of transport material. Material in the Sala and cleaning process often cause the coal dust, pollution to the environment; at the same time, spilled material also for transporting goods quality impact.
Thus, in the actual operation of the process, deviation of the belt not only on the belt conveyor itself damage greatly, and the existence of security risks, impact on productivity, conveying goods quality, environmental pollution and other problems o
Analysis of the causes of deviation of the belt machine 1
Deviation of belt conveyor directly for two reasons: first, conveying belt on both sides by the driving force is not balanced; second, supporting rolls or cylinders have a lateral force on the conveyor belt.
Conveyor
1.1 conveyor belt on both sides by the driving force imbalance
As shown in Figure 1, the drive force of the conveyor belt is not the same, the driving force of the A side is F1, the driving force of the B side is F2, and the F1 is F2, the conveyor belt will run to the A side..
There are many factors causing the imbalance between the two sides of the belt.:
Tensioning device of a belt conveyor installation error lead to the conveying zone on both sides of the tension caused by inconsistency of belt conveyor, tensioning device installation or improper regulation is the basic cause of belt on both sides of the stress is not consistent.
B. conveyor belt joint is not caused by the deviation of straight. Belt vulcanizing joint is connected with partial or the belt itself is not straight, which caused the belt tension on both sides evenly, belt to the tensioning force of side deviation, in belt joint or belt is not straight at the most serious deviation.
C. conveyor belt deviation caused by relaxation. Conveyor belt after running for a period of time, due to tension the belt permanent deformation or aging, so as to make the belt tensioning force result in decreased belt is loose, causing belt internal stress distribution is not uniform, also will cause the deviation phenomenon of the belt to varying degrees but
D. material distribution caused by uneven deviation. If the belt is idling without deviation, heavy load operation on the deviation, indicating that material in the belt on both sides of the uneven distribution. This deviation is belt machine actual use process is the most common, distribution of materials are mainly caused by material falling direction and position is not correct, if aggregate offset to the left, belt deviation to the right; and vice versa.
E. roller, roller of belt on both sides of the friction force is not balanced, the guide material groove on both sides of the rubber plate uneven pressure caused by operation of belt on both sides of the driving force and resistance, inconsistent, causing belt deviation o
F. roller, roller sticky material caused by the deviation. Belt conveyor after running for a period of time, because the material has a certain viscosity, the part will sticky stick in roller and roller, the roller or roller local cylinder diameter becomes larger, the both sides of the belt tension caused by uneven, causing the belt deviation. The factors causing the deviation generally occurs in the short distance of belt conveyor.
1.2 conveyor belt by lateral force
Conveying lateral force roller or roller belt is produced resulting in deviation of F.
Roller, roller mount position is not positive, the belt will be subject to the operation, as shown in Figure 2. Bearing roller installation position and the center of the conveyor line verticality error larger, or axis of the roller and the belt machine center line Perpendicularity Error is too large, resulting in belt in bearing segment to the side of the deviation. In a turnabout drum, roller installation position deviation of the most serious, and regardless of the bearing or return the farther more light deviation. But the driving drum tilt caused by the increasingly serious deviation are partial to run.
The deformation caused by the deviation. Rack skew include tilt frame center line skew and frame on both sides of the level, the two will make the belt subjected to lateral force, resulting in serious deviation, and it is difficult to adjust.
In addition, belt machine in operation of mechanical vibration is inevitable, in the belt speed faster and faster, the greater the vibration, caused by the deviation of the belt. In belt machine, roller radial runout vibration caused by the influence on the maximum deviation of the belt.
The common treatment of 2 belt deviation
For the deviation phenomenon of the belt conveyor. It is necessary to take corresponding countermeasures to adjust, the key is to eliminate the conveyor belt on both sides by the driving force is not balanced and belt subjected to lateral force factors such as. The deviation caused by the installation errors, we should eliminate the installation error of the belt joint;
