Conveyors: power-driven – Conveyor section – Thrower
Patent
1988-11-14
1990-12-18
Skaggs, H. Grant
Conveyors: power-driven
Conveyor section
Thrower
198842, 1988612, B65G 3100
Patent
active
049780000
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a conveyor belt system equipped with a discharge pulley and various preceding support rollers.
2. Background Art
In prior art conveyor belt systems, the discharge pulleys and the support rollers immediately preceding them are firmly mounted at the front end of the belt carrier. Since, moreover, the speed at which the belt of the conveyor system moves is generally fixed, it is practically impossible to change the parabola of fall during operation of the belt conveyor system. The unchangeable parabola of fall is a drawback in conveyor systems particularly when conveying sticky or dusty material or a material tending to form bridges.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an apparatus with simple means to change the parabola of fall downstream of the discharge pulley of a conveyor belt system during operation so that the parabola of fall can be adapted to different types of material being conveyed and can be set to a defined parabola of fall. In this way it is possible, for example, to prevent the occurrence of spills or clogging during the transfer of conveyed materials.
Also, for example, the development of dust can be reduced if dusty materials are conveyed. The invention solves the problem at hand by the features of a conveyor belt system for varying the parabola of fall of a conveyed material, comprising (a) a belt carrier having upstream and downstream ends; (b) an endless conveyor belt having upper and lower runs and being supported by and traveling along said belt carrier, said upper run traveling from said upstream to said downstream end of said belt carrier, the conveyed material being projected from the conveyor belt at the downstream end of said upper run; (c) a support roller carrier having upstream and downstream ends and having a plurality of rotatably attached support rollers for supporting said upper run of said endless conveyor belt, said support roller carrier being pivotably attached at its upstream end to said belt carrier; (d) a return pulley means rotatably attached to said belt carrier at its downstream end for guiding said endless conveyor belt from its upper to its lower run; and (e) means for varying the parabola of fall of a conveyed material projected from said downstream end of said conveyor belt, including: (1) a snub pulley means disposed upstream of said return pulley means for varying the height of said conveyor belt; (2) a pivot arm means attached to said snub pulley means and pivotably attached to said belt carrier for varying the height of said snub pulley means, said pivot arm means having an upper surface; (3) hydraulic cylinder means attached to said pivot arm means for pivoting said pivot arm means; and (4) a supporting roller means rotatably attached to said downstream end of said support roller carrier and engaging the upper surface of said pivot arm means for pivoting said downstream end of said support roller carrier about its upstream end when said pivot arm means is pivoted to thereby adjust the slope of said carrier belt at the downstream end of said upper run.
In the apparatus according to the invention, the additional arrangement of a snub pulley which is adjustable in any case in front of the discharge pulley-when seen in the conveying direction-permits the slope of the conveyor belt, before it runs onto return pulley, to be changed and thus the parabola of fall to be set. The conveyor belt is brought downward at a different angle in front of the return and drive pulleys depending on the height position to be set for the return pulley. The parabola of fall can be set by making the slope of the descending belt section in front of the return pulley adjustable. Thus, the parabola of fall can be selected in such a way that the material being conveyed is properly transferred even if, for example, the material is sticky. A bridge formation in the region of the dumped material can be avoided. On the other hand, the development of dust, if dusty material i
REFERENCES:
patent: 1278055 (1918-09-01), Stuart
patent: 2781892 (1957-02-01), Thevenieau
patent: 3107004 (1963-10-01), Arndt
patent: 3680681 (1972-08-01), Burk
patent: 3807549 (1974-04-01), Cowdery et al.
patent: 4128166 (1978-12-01), Kovats
Dayoan D. Glenn
PWH Anlagen & Systeme GmbH
Skaggs H. Grant
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