WO1988000916A1

WO1988000916A1 - Conveyor scraper apparatus

Info

Publication number: WO1988000916A1
Application number: PCT/AU1987/000253
Authority: WO
Inventors: Richard Thomas Owen Couper
Original assignee: Richard Thomas Owen Couper
Priority date: 1986-08-08
Filing date: 1987-08-10
Publication date: 1988-02-11

Abstract

A conveyor scraper assembly which is supported by a frame member (17) attached to a conveyor support frame (18) including a shaft (10) rotatable with respect to the frame member which includes a mounting member and a bearing slide member (23) with a bearing (14) therein which is slidable with respect to the frame member and is responsive to the position of the shaft with respect to the frame. A torsion arm is secured to the shaft at one end and at the other end is attached to an end of an elongated fluid cushion (28) and the other end is secured to a support member attached to the frame member and blade members (13) attached to the shaft which are urged against a conveyor belt (30) by means of the fluid cushion.

Description

CONVEYOR SCRAPER APPARATUS This invention relates to a conveyor scraper for scraping retained material off the return part of the conveyor after it has discharged. Such a scraper should be arranged as close as possible to the discharge point but on the return side - 5 of the conveyor. The scraper should also be designed to move away from any obstruction on the return side of the conveyor.

The invention is hereinafter described with reference to the accompanying drawings in which: 10 Figure 1 is a plan view of the torsion arm mechanism of the scraper of this invention.

Figure 2 is a plan view of an idle mount for one end of the torsion arm of Figure 1.

Figure 3 is a side elevation of the idle mount of Figure

2 15 '

Figure 4 is an end elevation of a secondary scraper assembly attached to the torsion arm of Figure 1.

Figure 5 is a side elevation of the scraper of Figure 4. Figure 6 is a side elevation of a primary scraper. 20 Figure 7 is an end elevation of an idle mount for one end of the scraper of Figure 6.

Figure 8 is a pictorial view of the primary scraper and mounting of Figure 6.

Figure 9 is a pictorial view of the secondary scraper of 5 Figures 1,2 & 4. ^' Figure 10 is an end elevation of a primary scraper blade. In the conveyor scraper of this invention there is provided a rotatable shaft 10 having secured along its length a retainer member 11 on which is slidably mounted a scraper mount 12 which has return projections which locate around the retainer member 11 and which is shown in Figure 10 as an angle piece.

The scraper mount is free to slide axially between prearranged limits and attached to it are scraper blades 13. The shaft is mounted at each end in a slidable bearing block having associated compression springs 15. A control arm is secured on the shaft 10 and the bearing block 14 is slidably mounted in a frame 17 with the springs 15 located between part of the bearing block 14 and the frame 17. A similar assembly of components may be provided at the other end of shaft 10. The frame 17 incorporates components _.to attach it to a conveyor housing 18 and has spaced webs 20 extending from a mounting part 21. Each web is provided with an opening 22 so that the direction of operation can be reversed without dismantling all of the components. The frame 17 incorporates an enlarged bearing slide section 23 with internal retaining guides which locate in grooves not shown in the bearing block 14.

A cushion support arm includes spaced arms 26 with a support pad 27 on which an air cushion housing 28 locates and has a fluid connection 24 so that the pressure therein may be varied and if there are more than one cushion there is provided a balance pipe 25 joining each air cushion. This air cushion acts to provide a constant tension applied to the shaft 10 and hence the contact pressure of the scrapers on the conveyor belt 30 passing around the end roller 37. The air cushion has a head 29 having a blind threaded stud hole in which a stud on a U shaped yoke threads. The arms of the yoke 31 are hinged on the control arm 17 by a pin 32. A limiting rod 33 is pivotally mounted on the control arm 27 inboard of the yoke 31 by means of a pin 34 and yoke block 35. The rod 33 passes through a hole in a guide block 36 and beyond the guide block is adjustable secured at its distal end. A link member 38 in the form of a U shaped rod is journalled or pinned to the spaced arms of the yoke 31 and yoke block 35 and these components keep the air cushion in alignment with its supports at each end.

The other end of the shaft may have the bearing block assembly aforesaid but omit the air cushion components if the- installatio is of short length and does not require a balancing torsion at each end.

The scraper blades may be plastic or rubber 13 secured to the individual scraper mounts 12 or metal scrapers 39 may be mounted on the distal ends of resilient rods mounted in blocks 40 on the scraper mounts 12.

Claims

The claims defining the invention are as follows:-

1. A conveyor scraper assembly including a frame member for attachment to a conveyor support frame, a shaft rotatable with respect to the frame member, a mounting member attached to the frame member and including a bearing slide member, a bearing slidable with respect to the to ..tlie.-frame.- member and in which the bearing is mounted for movement in.,responce to the position of the shaft axis in relation: tσ _______eErams .. member, a torsion arm secured to said shaft at one- end and. . at the other end pivotally attached to art _md-'me-__er._'Of an. elongated fluid cushion, the other end being secured to a support member attached to the frame member, blade members; attached to the shaft for contact with a conveyor belt and the blade members being urged against the conveyor belt by means of the fluid cushion.

2. A conveyor scraper as claimed in claim 1 in which the shaft includes a retainer member on which is slidably mounted a scraper mount to which a scraper blade is attached.

3. A conveyor scraper as claimed in claim 1 in which the torsion arm is pivotally attached to the end member and which torsion arm is pivotally attached to a link member which is pivotally attached to an attachment plate on a control arm the other end of the control arm being adjustably attached to the frame member.

4. A conveyor scraper as claimed in claim 1 in which the fluid is air.

5. A conveyor scraper as claimed in claim 1 in which there are two or more fluid cushions connected to the same fluid supply.