Belt loading conveyor
belt tearing accidents can be roughly divided into two categories: longitudinal tearing and transverse tearing. Among them, longitudinal tearing accounts for more than 90% of the total number of belt tearing failures. We mainly focus on longitudinal tearing. Analyze the cause of the crack.
Cause analysis of belt tearing of belt loading conveyor
1 Belt deviation and tearing
When the belt conveyor
is in normal operation, its belt should be located in The central axis of the frame, and when the belt runs off-track, it will cause the belt to accumulate and fold on the off-track side. Under the long-term action of the unbalanced force, the belt is prone to tearing failure.
Generally speaking, this kind of situation will only occur on the side of the belt and not on the inner side of the belt, which is less of a threat to production safety. At the same time, this kind of belt tearing has It is a more obvious sign that there is a long reaction time from the deviation of the belt to the tearing, so it can be prevented through inspection and maintenance.
2 Belt shaft core tearing
When the belt conveyor is running, if it is strongly impacted by large metal materials or gangue, it may cause the belt steel core to break, and the broken part If the steel core continues to be used, under the influence of prolonged stretching and loading, it may penetrate the belt and be exposed outside the belt cover rubber. When the exposed length of the steel core is long, it may be involved in the idler, steering drum and other components when the belt is running, and be continuously pulled out as the belt is running, causing the belt to break.
There is also a situation in which the scraper clip of the head cleaner catches the metal or other debris on the surface of the belt and wears the belt through. Preventing such tearing can only strengthen the inspection vision. When the exposed wire rope ends are found, they should be cut off immediately to avoid future troubles.
3 Scratching and tearing
In the longitudinal tear of the belt, scratching and tearing are the most common cases, which can usually be divided into two types: sharp tool pressure scratches and penetrating scratches. kind. The former is that a large-sized long rod is stuck at the bottom of the chute, and the belt is scratched by the driving force of the belt; the latter is that the sharp tool falls from a certain height, and its tip penetrates the belt and gets stuck under the influence of gravity. On chutes or idlers, the belt is torn as it continues to advance.
4 Material jamming and tearing
This situation occurs in the lower part of the chute, because the distance between the front edge of the chute and the belt surface is limited, and the buffer tray under the belt The rollers are distributed at intervals, and the natural bearing capacity is uneven. When the projected length of the transported material on one side exceeds this distance, it is easy to cause large pieces of material to be stuck between the front edge of the chute and the belt under special circumstances. .
There is also a situation that when the feed at the loading point suddenly increases, the belt is blocked, and the belt is torn after a long period of friction when there is no system shutdown due to the blockage.
Countermeasures to prevent belt tearing
1Proactively prevent tearing from the source
Strengthen the control of material quality and increase impurity removal equipment for removal miscellaneous. A large block removal device is set before the primary belt to reduce the large block materials entering the entire conveying system.
2Increase the passing capacity of the chute
On the premise that the width of the chute is determined by the width of the belt, expand the outlet of the chute upward to maximize its passing capacity to avoid jamming debris or large block material.
3 Strengthen the management of equipment
Improve the inspection and inspection of the belt, especially the management of other ancillary equipment of the belt conveyor, such as the inspection of the transfer funnel, cleaner and other facilities, to prevent lining Sharp objects such as boards come off.
4Improve the conveyor structure
By reducing the drop of the blanking point, increasing the buffer grid, the fine materials fall before the bulk materials, etc., reduce the impact, reduce the material speed, reduce the Possibility of foreign matter being inserted into the belt.
5 Improve the structure of the belt itself
For example: improve the air tightness of the belt, prevent the core layer from entering the water and the steel wire rope from rusting, and require the manufacturer to strengthen the quality control and improve the quality.
6 Add tearing detection device
When the belt is torn, it will be detected as soon as possible in the shortest time, an alarm will be issued and the machine will be stopped, so as to reduce the tearing length as much as possible and reduce the loss.
Tear-resistant belts use steel wire rope as the longitudinal skeleton material, and add transverse reinforcements in the belt body as a tear-resistant layer, but this anti-tear belt Ripped belts cost about 20% more than regular belts.
8Using a belt that can detect tearing
Add a sensor with a closed coil in the belt, the detector is installed in the easy tearing part of the belt conveyor, the detector and the controller connected. If the belt is torn, the closing coil of the sensor will be cut off. When it passes the detector, the detector will stop sending out the pulse signal, and the controller will not receive the pulse signal, it will alarm and stop immediately. At present, such belts cannot be produced in China, and the cost is relatively high.
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