GB2227991A - Conveyor belt scraper mechanism - Google Patents
Conveyor belt scraper mechanism Download PDFInfo
- Publication number
- GB2227991A GB2227991A GB9002384A GB9002384A GB2227991A GB 2227991 A GB2227991 A GB 2227991A GB 9002384 A GB9002384 A GB 9002384A GB 9002384 A GB9002384 A GB 9002384A GB 2227991 A GB2227991 A GB 2227991A
- Authority
- GB
- United Kingdom
- Prior art keywords
- scraper
- shaft
- elements
- conveyor belt
- assembly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G45/00—Lubricating, cleaning, or clearing devices
- B65G45/10—Cleaning devices
- B65G45/12—Cleaning devices comprising scrapers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
Abstract
In a scraper assembly for use in cleaning an endless conveyor belt, the scraper is mounted so as to be angularly adjustable within a restricted angular extent so that the scraping edge of the blade is in advance of the axis about which the blade is resiliently rockable on a shaft 110. The mounting includes a tapered plug and socket, the plug including a collar having a lateral protuberance located in an arcuate slot in the socket element 138. The scraper includes a plurality of scraper blades individually resiliently rockable about the shaft 110 by means of synthetic plastics material 112. To aid cleaning water may be ducted to the blades via the shaft 110. <IMAGE>
Description
Conveyor belt scraper mechanism.
The invention relates to a conveyor belt scraper mechanism such as are used in quarries and coal mines.
It is known to provide an endless conveyor belt scraper mechanism having a scraper assembly including a plurality of scraper elements individually mounted on a carrier bar, the carrier bar being mounted in such a way that it is biased towards the belt to bring the scraper edges of the elements into engagement with the surface of the belt. Such an arrangement works reasonably well but has one particular disadvantage, this being that since the scraper elements are individually mounted on the carrier bar it is possible for certain operational difficulties to occur as a result of the endless conveyor belt wandering slightly to one side or the other from its normal path of movement.When this occurs, it is possible for an endmost one of the scraper elements to move relative to the remaining elements and to assume a position alongside the belt to effectively prevent the belt from returning to its proper path of movement. This can of course seriously damage the edge of the belt.
With this difficulty in mind, it has previously been proposed to make such a scraper assembly by a method including the step of moulding a noncircular section sheathing of a synthetic plastics material on a non-circular section central shaft and mounting a plurality of scraper elements thereon by slide mounting respective lengths of non-circular section hollow shaft carrying respective scraper blades onto said sheathing so that said lengths of non-circular section hollow shaft, and the scraper blades carried thereby, abut together with the scraper blades in line. In this way it has been possible to ensure that each scraper element has been capable of only a certain limited amount of resilient movement relative to the remainder of the elements, that is to say a movement limited to about 6 m.m. at the scraper edge concerned.When limited to this amount, this effectively prevents the belt edge damage which has previously been caused by an endmost one of the scraper elements being able to run off the edge of the belt because it has not prevented the belt from subsequently resuming its central position.
However, one further difficulty has been found when using a scraper assembly of the kind just described, this being that if the assembly has not been set so that each scraper element has its scraper edge located in advance of the rocking axis of the element, a build-up of dirt and slurry has taken place on the scraper assembly itself and this has in time affected the scraping efficiency of the mechanism.The fact that the opposite ends of the scraper assembly have generally been provided with frusto-conical end pieces forming part of respective taper plug and socket fixings for securing the scraper assembly very firmly at a required angle between a pair of locating arms, with the object of facilitating fine angular adjustment of the scraper assembly, has resulted in the scraper assembly on occasions having been reset at a wrong angle, sometimes with the scraper edges of the scraper elements located to the rear of the rocking axis of the elements.
According to the invention, there is provided conveyor belt scraper mechanism including a scraper assembly for extending across the belt and secured at its opposite ends to adjustable mounting means, the scraper assembly including a plurality of scraper elements individually mounted on a common shaft by resilient means to urge edges of the elements into engagement with a corresponding part of the surface of the belt whereby the elements are individually deflectable about a rocking axis, counter to the action of said resilient means, the adjustable mounting means securing the opposite ends of the scraper assembly including means for ensuring that the assembly can only be fitted in position within an angular range of adjustment such that, with respect to the direction of movement of the conveyor belt concerned, each scraper element has its scraper edge located in advance of the rocking axis of said element. The common shaft will preferably be a non-circular section central shaft with a noncircular section sheathing of a synthetic plastics material carrying the plurality of scraper elements, each scraper element including a length of non-circular section hollow shaft fitted on the non-circular sheathing of said mounting shaft to restrain rotation thereon, respective scraper blades being carried by the lengths of non-circular section hollow shaft and abutting together in line or adjoining blades being alternately staggered.
The opposite ends of the common shaft of the scraper assembly may be provided with frustoconical end pieces forming part of respective taper plug and socket fixings for securing the scraper assembly at a required angle, and in this case the angular range of adjustment may be determined by the said taper plug and socket fixings, each fixing preferably including a collar with a lateral protuberance which is located in an arcuate slot in the adjacent face of the associated socket element forming part of said fixing, the arrangement being such that when locking elements between the frustoconical end pieces and their associated socket elements are released, the scraper assembly can be re-adjusted to the extent of the available free movement of the protuberances in the arcuate slots.
Means may be provided for ducting water to the interior of the common shaft on which the plurality of scraper elements are mounted, flow passages for water being established from the interior of said shaft through at least some of said scraper elements onto the belt. The flow passages for water from the interior of the common shaft onto the belt may have been established by a drilling operation with the scraper elements in situ on the shaft, or by a pre-drilling operation whereby holes and/or cavities forming the flow passage for water have been caused to line up as the scraper elements are being mounted on the shaft.
In order that the invention may be fully understood and readily carried into effect, the same will now be described, by way of example only, with reference to the accompanying drawings, of which:- Figure 1 is a perspective view of a scraper mechanism embodying the invention,
Figure 2 is a perspective view of a scraper assembly forming part of the mechanism of Figure 1,
Figure 3 is an end view of the scraper assembly,
Figure 4 is an exploded view showing the scraper assembly in course of assembly,
Figure 5 is an exploded view of one of a plurality of scraper elements forming part of the scraper assembly,
Figure 6 is a part-sectional side view of a taper plug and socket fixing which will be referred to,
Figure 7 is a sectional view on the line 7-7 in
Figure 6, and
Figure 8 is a view similar to Figure 4 which illustrates a possible modification which will be referred to.
Referring now in particular to Figure 1 of the drawings, the apparatus there illustrated for cleaning a conveyor belt (shown in chain-dotted lines) includes a scraper assembly generally indicated 10 secured at its opposite ends to locating arms constituted by respective leaf springs 12 so as to bear against the underside of the belt.
The leaf springs 12 are mounted at their ends remote from the scraper assembly on respective mounting blocks 14 which are provided with respective stub shafts 16 of hexagonal cross section. The stub shafts extend rotatably through plain cylindrical bores of respective fixing brackets 20, provided with apertured plates 22, which can be bolted to fixed frame structure (not shown) of the conveyor concerned. Respective circular plates 26 are welded to the fixing brackets 20.
The circular plates 26 form part of respective detent means which are provided for releasably securing the mounting blocks in an angularly adjusted position. Each detent means includes a fixing lug 28 having a boss portion 30 with a hexagonal bore by means of which it can be located on the respective stub shaft 16. Each detent means also includes a locating peg 32 by means of which the respective fixing lug can be secured to the adjacent circular plate 26. As shown, each circular plate has a plurality of equally spaced sets of holes 34 arranged on two pitch circle diameters and in which the respective pegs can be engaged.Each fixing lug has two sets of three holes 36 and these are spaced apart in such a way that by their selective use the fixing lug concerned can be secured to the adjacent circular plate in angular increments of adjustment one sixth of those of the angular spacing of the holes in either one of the sets of holes 34 in the adjacent plate. The stub shafts are axially located by respective collars 38 capable of being fixed on said shafts by screws 40.
The mounting blocks 14 on which the leaf springs 12 are mounted are of a composite construction, each block having an open ended metal outer casing and a centrally located metal sleeve for the location of the stub shaft, the space surrounding the metal sleeve within the casing being filled with polyurethane. During the installation of the cleaning apparatus, the mounting blocks can be subjected to torsion, to appropriately pre-load the scraper assembly against the conveyor belt concerned, by means of levers (not shown) which can be connected to the outer ends of the stub shafts 16. The appropriate amount of pre-load can be maintained in the installation by the use of the detent means referred to above.
Referring now in particular to Figures 2 to 5, the scraper assembly 10 includes a mounting shaft having a central shaft portion 110 of square section hollow tube on which has been moulded a square section sheathing of a synthetic plastics material 112, the square section of the tube and the square external shape of the synthetic plastics material being set at an angle of 450 to each other as shown. A plurality of scraper elements, generally indicated 114, are individually mounted side by side on the mounting shaft.
As best seen in Figure 4, each scraper element includes a length of square section hollow shaft 116 with an internal dimension such that it can be slide mounted on the square section sheathing of the mounting shaft. A mounting bracket 118 is welded to the length of hollow shaft 116 to provide an upstanding surface against which an upstanding blade carrier plate 122 can be secured by means of a set screw 124 (see Figure 5) engaging a screwthreaded hole (not shown) in said bracket. A pair of abutment plates 126 welded to a back face of the blade carrier plate are arranged to abut as shown against the side surfaces of the mounting bracket so that the blade carrier plate is secured to said bracket in an upstanding condition despite being connected thereto by only a single screw.
Referring to Figure 5, each scraper element includes a scraper blade 128 secured to the respective blade carrier plate by a pair of screws 130 with nuts 132. The opposite longitudinal edges of the scraper blade are both sharpened so that when one edge has become worn down the blade can be inverted to bring the other sharpened edge into use. An edge portion of a sheet 134 of a synthetic plastics material is sandwiched as shown between the blade and carrier plate for the remainder of the sheet to overlie the bracket 118, thus preventing at least to some extent the build-up of dirt thereon as the scraper blade scrapes dirt from the conveyor belt concerned.
When the scraper elements have been located side by side, each length of square section hollow shaft 116 having been slide mounted on the square section sheathing of the mounting shaft as shown in Figure 4, the operative scraper edges of the scraper blades 128 are located in line as shown in Figure 2. The arrangement is such that each scraper element is capable of a certain amount of resilient movement on the mounting shaft relative to the remainder of the elements but this movement, measured as a movement of the edge of the respective scraper blade, is limited to about 6 m.m. It is found that when the resilient movement of each individual scraper element is limited to approximately this amount, this effectively prevents belt edge damage which has previously been caused by an endmost one of the scraper elements being able to run off the edge of the belt.It is found that such limited free movement of an endmost scraper element does not prevent the belt from tracking back to its proper location after an endmost scraper element has run off the edge of the belt.
The opposite ends of the assembly are shown to have been provided with frusto-conical end pieces 136, these having been connected to the opposite ends of the central shaft 110 by square section location shafts 137 to which the end pieces are welded and which are a slide fit in the ends of the central shaft 110. The frusto-conical end pieces form part of respective taper plug and socket fixings for securing the scraper assembly at a required angle between their locating arms, that is to say the leaf springs 12 shown in Figure 1.
The respective taper sockets in which the frustoconical end pieces 136 are fitted are formed in upstanding socket elements 138 screwthreaded portions of which extend through holes near the free ends of the leaf springs and engage clamping nuts 140 on the underside of the springs.
Referring to Figure 3, it is important that the scraper assembly is set so that each scraper element has its scraper edge located in advance of the rocking axis of the element so that a build-up of dirt and slurry does not take place on the scraper assembly itself. In Figure 3 the scraper edge of the scraper element illustrated is shown to be located in advance of the rocking axis by the distance 'd'. This requirement has been allowed for in the design of the mounting bracket 118 so that the scraper element is shown presented to the underside of the belt at a suitable angle of attack. However, different working conditions require the scraper elements to be presented to the conveyor belt surfaces at slightly different angles and a required adjustment to effect such variation can be made by steplessly adjusting the settings of the taper plug and socket fixings.
Referring now to Figures 6 and 7, means are provided for ensuring that the scraper assembly can only be fitted in position within a certain angular range of adjustment such that, with respect to the direction of movement of the conveyor belt concerned, each scraper element has its scraper edge located in advance of the rocking axis of the element so that a build-up of dirt and slurry on the scraper assembly will tend to be avoided. Said means are associated with the taper plug and socket fixings for securing the scraper assembly in position and with reference to each fixing include a collar 142 with a square shaped central hole which is a slide fit on the location shaft but is locked in position against the frusto-conical end piece by a grub screw 143.The collar is provided with a lateral protuberance 144 which is located in an arcuate slot 145 formed in the adjacent face of the associated socket element 138. The arrangement is such that when a pair of set screws 146, which normally hold the frusto-conical end pieces tightly in their associated socket elements, have been slackened, the scraper assembly can be re-adjusted, as required, but only to the extent of the available free movement of the protuberances 144 in their arcuate slots 145. The set screws 146 will then be re-tightened.
Various modifications may be made. For example, means may be provided for facilitating the fine adjustment of the scraper assembly within the limited angular range referred to. Such means may be associated with one or possibly both of the taper plug and socket fixings by which the assembly is located in position and may include a screwthreaded abutment member which can be brought into engagement with an adjacent locating member, the abutment member and the locating member being carried by mutually adjustable parts of the or each fixing concerned. In Figure 8 there is illustrated a possible modification in which the mounting shaft has a central shaft 110 of triangular section hollow tube on which has been moulded a triangular section sheathing as shown.In this case each scraper element includes a length of triangular section hollow shaft 116 with an internal dimension such that it can be slide mounted on the triangular section sheathing of the mounting shaft. (The shape of each mounting bracket has of course been modified to suit the modified shape of the hollow shaft to which it is to be welded and again with due regard to the fact that, when the scraper assembly is in use, each scraper element has its scraper edge located in advance of the rocking axis of the element as shown in Figure 3). The central shaft 110 could be of any other non-circular shape (and the holes in the collars 142 will be made of the same shape) and the hollow shafts 116 could likewise be of any other non-circular shape.The central shaft could even be made of circular section tube but in this case would be provided with a plurality of metal pins or the like projecting through it and acting as key pieces on which the non-circular section sheathing 112 will be moulded. The collars 142 would in this case probably require to be welded on.
It will be understood that the scraper blades can be made of steel or of polyurethane or a combination of the two. It may also be found advantageous to secure spare scraper blades to each scraper element using the same pairs of screws 130 by means of which the scraper blades are shown to be connected to the upstanding carrier plates in the illustrated embodiment. If spare scraper blades are carried, they can be used as spacer members in such a way that adjoining operative scraper blades are staggered. Of course, staggering of the scraper blades can be brought about by other means, for example by using mounting brackets 118 of appropriately different shapes, and in this case the scraper blades can be made somewhat wider so that they slightly overlap each other whereby there is no danger of adjacent staggered blades leaving an unscraped strip of conveyor belt between them.
A scraper assembly embodying the invention may be very useful if washing of the conveyor belt is required. In this case water can be ducted to the interior of the central shaft 110 and water jets could be established through at least some of the scraper elements onto the belt. The way in which water jets are established can either be by a drilling operation with the scraper elements in situ on the mounting shaft or such holes may be pre-drilled to line up with cavities formed in the sheathing of the shaft as the scraper elements are being mounted on the shaft.
Claims (8)
1. Conveyor belt scraper mechanism including a scraper assembly extending across the belt and secured at its opposite ends to adjustable mounting means, the scraper assembly including a plurality of scraper elements individually mounted on a common shaft by resilient means to urge edges of the elements into engagement with a corresponding part of the surface of the belt whereby the elements are individually deflectable about a rocking axis, counter to the action of said resilient means, the adjustable mounting means securing the opposite ends of the scraper assembly including means for ensuring that the assembly can only be fitted in position within an angular range of adjustment such that, with respect to the direction of movement of the conveyor belt concerned, each scraper element has its scraper edge located in advance of the rocking axis of said element.
2. Conveyor belt scraper mechanism according to claim 1, in which the common shaft is a noncircular section central shaft with a non-circular section sheathing of a synthetic plastics material carrying the plurality of scraper elements, each scraper element including a length of non circular section hollow shaft fitted on the noncircular sheathing of said mounting shaft to restrain rotation thereon, respective scraper blades being carried by the lengths of non-circular section hollow shaft and abutting together in line or adjoining blades being alternately staggered.
3. Conveyor belt scraper mechanism according to claim 1 or claim 2, in which the opposite ends of the common shaft of the scraper assembly are provided with frusto-conical end pieces forming part of respective taper plug and socket fixings for securing the scraper assembly at a required angle.
4. Conveyor belt scraper mechanism according to claim 3, ,in which the angular range of adjustment is determined by the taper plug and socket fixings for securing the scraper assembly in position.
5. Conveyor belt scraper mechanism according to claim 4, in which each fixing includes a collar with a lateral protuberance which is located in an arcuate slot formed in the adjacent face of the associated socket element forming part of said fixing, the arrangement being such that when locking elements between the frusto-conical end pieces and their associated socket elements are released, the scraper assembly can be re-adjusted to the extent of the available free movement of the protuberances in the arcuate slots.
6. Conveyor belt scraper mechanism according to any one of the preceding claims, in which means are provided for ducting water to the interior of the common shaft on which the plurality of scraper elements are mounted, and flow passages for water are established from the interior of said shaft through at least some of said scraper elements onto the belt.
7. Conveyor belt scraper mechanism according to claim 6, in which the flow passages for water from the interior of the common shaft onto the belt have been established by a drilling operation with the scraper elements in situ on the shaft, or by a pre-drilling operation whereby holes and/or cavities forming the flow passage for water are caused to line up as the scraper elements are being mounted on the shaft.
8. Conveyor belt scraper mechanism constructed, arranged and adapted to be adjusted substantially as hereinbefore described with reference to and as illustrated by the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB898903217A GB8903217D0 (en) | 1989-02-13 | 1989-02-13 | Conveyor belt scraper mechanism |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9002384D0 GB9002384D0 (en) | 1990-04-04 |
| GB2227991A true GB2227991A (en) | 1990-08-15 |
| GB2227991B GB2227991B (en) | 1992-05-20 |
Family
ID=10651605
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB898903217A Pending GB8903217D0 (en) | 1989-02-13 | 1989-02-13 | Conveyor belt scraper mechanism |
| GB9002384A Expired - Fee Related GB2227991B (en) | 1989-02-13 | 1990-02-02 | Conveyor belt scraper mechanism |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB898903217A Pending GB8903217D0 (en) | 1989-02-13 | 1989-02-13 | Conveyor belt scraper mechanism |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB8903217D0 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2259682A (en) * | 1991-09-17 | 1993-03-24 | Willem Dirk Veenhoff | Conveyor belt stripper/scraper assembly |
| EP0574600A1 (en) * | 1992-06-15 | 1993-12-22 | Nippon Tsusho Kabushiki Kaisha | Apparatus for supporting belt cleaners |
| DE29709117U1 (en) * | 1997-05-23 | 1997-07-17 | Stahlgruber Otto Gruber GmbH & Co, 81675 München | Scraper device for cleaning conveyor belts |
| US6179114B1 (en) * | 1998-07-23 | 2001-01-30 | Slic Trading Company Limited | Torsion holder conveyor belt scraper |
| US6820734B1 (en) * | 1999-09-27 | 2004-11-23 | Mato Australia Pty Ltd. | Conveyor belt cleaner tensioning device |
| WO2020200441A1 (en) * | 2019-04-03 | 2020-10-08 | Schulte Strathaus GmbH & Co. KG Fördertechnik Dichtungssysteme | Conveyor belt scraping device and displacement guide therefor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0004809A2 (en) * | 1978-04-07 | 1979-10-17 | FIVES-CAIL BABCOCK, Société anonyme | Cleaning apparatus for endless conveyor belt |
| EP0090985A1 (en) * | 1982-03-30 | 1983-10-12 | Hosch Fördertechnik GmbH | Scraper device for belts |
| GB2221887A (en) * | 1988-07-29 | 1990-02-21 | Conveyor Improvements | Conveyor belt scraper assembly |
-
1989
- 1989-02-13 GB GB898903217A patent/GB8903217D0/en active Pending
-
1990
- 1990-02-02 GB GB9002384A patent/GB2227991B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0004809A2 (en) * | 1978-04-07 | 1979-10-17 | FIVES-CAIL BABCOCK, Société anonyme | Cleaning apparatus for endless conveyor belt |
| EP0090985A1 (en) * | 1982-03-30 | 1983-10-12 | Hosch Fördertechnik GmbH | Scraper device for belts |
| GB2221887A (en) * | 1988-07-29 | 1990-02-21 | Conveyor Improvements | Conveyor belt scraper assembly |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2259682A (en) * | 1991-09-17 | 1993-03-24 | Willem Dirk Veenhoff | Conveyor belt stripper/scraper assembly |
| US5310042A (en) * | 1991-09-17 | 1994-05-10 | Martin Engineering Company | Conveyor belt stripper |
| GB2259682B (en) * | 1991-09-17 | 1995-02-15 | Willem Dirk Veenhoff | Conveyor belt stripper |
| EP0574600A1 (en) * | 1992-06-15 | 1993-12-22 | Nippon Tsusho Kabushiki Kaisha | Apparatus for supporting belt cleaners |
| DE29709117U1 (en) * | 1997-05-23 | 1997-07-17 | Stahlgruber Otto Gruber GmbH & Co, 81675 München | Scraper device for cleaning conveyor belts |
| US6179114B1 (en) * | 1998-07-23 | 2001-01-30 | Slic Trading Company Limited | Torsion holder conveyor belt scraper |
| US6820734B1 (en) * | 1999-09-27 | 2004-11-23 | Mato Australia Pty Ltd. | Conveyor belt cleaner tensioning device |
| WO2020200441A1 (en) * | 2019-04-03 | 2020-10-08 | Schulte Strathaus GmbH & Co. KG Fördertechnik Dichtungssysteme | Conveyor belt scraping device and displacement guide therefor |
| US11034526B2 (en) | 2019-04-03 | 2021-06-15 | Schulte Strathaus GmbH & Co. KG Fördertechnik Dichtungssysteme | Conveyor belt stripping device and displacement guide for the same |
| AU2019316538B2 (en) * | 2019-04-03 | 2021-08-12 | Schulte Strathaus GmbH & Co. KG Fordertechnik Dichtungssysteme | Conveyor belt stripping device and displacement guide for the same |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2227991B (en) | 1992-05-20 |
| GB8903217D0 (en) | 1989-03-30 |
| GB9002384D0 (en) | 1990-04-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19940202 |