Conveyors: power-driven – Conveyor having impinging fluid to feed – shift or discharge... – Having cleaning means
Patent
1995-04-10
1997-04-22
Werner, Frank E.
Conveyors: power-driven
Conveyor having impinging fluid to feed, shift or discharge...
Having cleaning means
152566, B65Q 4512
Patent
active
056222491
DESCRIPTION:
BRIEF SUMMARY
This invention relates to belt scrapers, being scrapers of the kind used to scrape caked material from conveyor belts.
BACKGROUND TO THE INVENTION
Conveyor belts are in common use in mines for the transport of ore and debris to and from crushing and milling machines and the like. A problem with conveyor belts is that dust and fine particles of crushed ore and debris can become caked very firmly indeed to the belt, especially if moisture is present. The caked material is not necessarily worthless dirt, but may contain valuable minerals, including gold dust; it is important to scrape the blade clean, not just for the sake of cleanliness, but in order not to waste valuable material.
Scraping caked material from mine conveyor belts is well-known to be a most demanding task. The designer usually approaches the task on the basis of pressing a scraper blade against the (moving) face of the belt. The scraper blade gradually wears down under the abrasive conditions, and one of the problems of belt-scraping lies in providing a scraper blade of sufficient length that the blade has a long service life between replacements.
Another of the problems associated with belt scrapers arises because the belt is not of a uniform thickness. For example, at the joints between sections of the length of the belt the overall thickness of the belt can be greater, which can cause the scraper to "bump" as the belt-joint passes the scraper.
The scraper blade should be able to retract to accommodate this bump; if it cannot retract, the blade (and the belt) may be damaged. It is preferable that this retraction movement, if the scraper is to accommodate the bump easily, be not accompanied by friction, i.e., that the retraction and recovery movement, or the bounce and rebound, should be hysteresis-free.
It is a first aim of the invention to provide a scraper assembly in which the force applied between the scraper blade and the belt remains at a substantially constant or uniform level, even though the scraper may be bouncing and bumping towards and away from the belt, for example because of variations in the thickness of the belt. Bumping and bouncing can also be caused by debris that sticks to the belt with varying intensities of adherence.
It is a second aim of the invention to provide a means for adjusting the position of the scraper blade, relative to the blade housing, to compensate for the gradual wearing away of the blade. Preferably, it is an aim that the adjustment be automatic.
BASIC FEATURES OF THE INVENTION
The invention consists in a conveyor belt scraper apparatus, suitable for use with a conveyor belt which is travelling with respect to a fixed frame, having the following characteristics.
The scraper blade is arranged for direct scraping contact with the belt, and is mounted in a housing. In one form of the invention, the housing is mounted for movement in a suspension means, the movement being in the direction towards and away from the belt. In this case, where the housing is suspended, the arrangement is such that an actuator presses the suspended housing, together with the blade, against the conveyor belt.
The actuation force pushes the housing and the blade together against the belt. The reaction to this force is supported by a suitable reaction means. The arrangement of the reaction means might involve pushing the scraper against the belt, the reacting that force against something solid. The reaction means is solid in the case where the reaction means comprises a reaction roller with a fixed axle, positioned on the other side of the belt, directly opposite the blade. The reaction means is solid also in the case where the reaction means comprises the head pulley of the belt. The housing and scraper blade can be pushed against the head pulley very hard, with virtually no deflection of the belt.
On the other head, it may be preferred for the reaction means to have a little "give", in which case the reaction means can include a resilient component for reacting the scraper actuation load. One way in which the reaction me
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