CA2015979C - Conveyor belt stripper - Google Patents
Conveyor belt stripperInfo
- Publication number
- CA2015979C CA2015979C CA 2015979 CA2015979A CA2015979C CA 2015979 C CA2015979 C CA 2015979C CA 2015979 CA2015979 CA 2015979 CA 2015979 A CA2015979 A CA 2015979A CA 2015979 C CA2015979 C CA 2015979C
- Authority
- CA
- Canada
- Prior art keywords
- blade
- belt
- layer
- section
- conveyor belt
- 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.)
- Expired - Lifetime
Links
Landscapes
- Details Of Cutting Devices (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
An improved method and apparatus for stripping a layer of elastomeric material from a laminated conveyor belt wherein the elastomeric strip is separated from the adjacent layer with a knife edge heated sufficiently to melt the elastomeric strip at its point of contact with the adjacent layer.
Description
201~979 This invention relates to improved means for removing the rubber layer from a laminated conveyor belt and, in partlcular, employs a heated blade to melt the rubber at its polnt of attachment to an inner ply of the belt, thereby enabling the rubber to be readily pulled away.
BACKGROUND OF THE INVENTION
An endless conveyor belt ls made by ~olning together the er-ds of a length of belt materlal. The belt material is usually made with several plies of material (e.g., a laminate) and, in general, will have an inner ply made of cords, usually steel, extending along the length of the belt in order to prevent excessive stretching of the belt during use. In general, the conveyor belts to which this invention applles will have a central layer of steel or other metal cord covered on each side with an appropriate elastomeric material.
During use, however, damage frequently occurs to conveyor belts and lt becomes necessary to make repairs on the belt. Such repairE require that a layer of the belt material be removed. One method of removing a layer of belt material from a conveyor belt is to form a cut in the layer of materlal across the length of the belt at a predetermined distance from the end of the belt, and to form one or more cuts along the length of the belt between the cross cut and the end of the belt. The strips formed by the cuts in the layer of belt materlal then can be peeled away from the other layers of belt material. The peellng away of the Etrip of 2~1~979 material is usually done by hand or by use of a winch and the strips of material are pulled away while simultAneously cutting the adhesive or bond between the layers of material with a knife or other sharp inst.rument. Since t.he layers of the belt material are us~ally securely bonded together so that the belt will last a long time when in use, the task of stripping the outer layers at the ends of a helt is onero-]s an(~ ti.me corlsllmirlg.
DISCUSSION ~F PRIOR ART
U.S. 3,929,555 discloses a conveyor belt strlpper system ln which a winch on a portable framework ls used to pull from the belt strips of material cut by hand.
SUMMARY OF THE INVENTIO~
The present lnvention relates to an lmproved method of stripping a layer of elastomeric material from a laminated conveyor belt wherein an outer layer of the elastomer is cut into strips and the strips are pulled away from an adjacent layer of the belt, the improvement which comprises separating the elastomeric strip from the adJacent layer with a knife edge which is heated sufficiently to melt the elastomeric strip at its point of contact wlth the adJacent layer, whereby removal of the elastomeric strip is greatly facilitated.
Another embodiment of the inven~lotl is an a~r~aratus ~sed in the method of the invention which comprises, in combination, a knlfe edge adapted to contact the ~uncture of metal cord and elastomer of a laminated conveyor belt, 201 5q7q supporting means for the knife edge on a guiding frame and electrical mean~ to heat the knlfe edge to a temperature sufficient to melt the elastomeric layer.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a perspective view of the apparatus in use.
Fig. 2 is an expanded, detailed view of how the knife edge is mounted on the apparatus.
Flg. ~ ls a cross-~ectional view showlng the functlon of the knife edge.
DETAILED OESCRIPTION OF THE INVENTION
The equipment required to carry out the method of the invention will comprise a power source, an apparatus to hold and guide the knife edge and means to pull the strips of elastomer from the conveyor belt, preferably a winch or similar device which enables a controlled pull of the knife edge through the rubber at the junction of the layers of the conveyor belt. Referring now to Flg. 1, a power source 11 supplies electrlcal power through two 4/0 weldlng cables 12 and umbilical cord assembly 14 to a knlfe edge 13 through contact points 13a and 13b. The knlfe edge ls mounted on a finger assembly 29 (see detail in Fig. 2 and Fig. 3) which in turn comprise part of a guidlng apparatus shown generally as 17. A winch 19 is powered by a separate source of power thro~lgh electric cables 18 and 18a via a power controller box 21 and serles of on/off switches 41 (toggle) and A5 (Eprlng off) and a foward/reverse selector swltch 43 mounted on handle 23 of the guldlng frame 17.
201 5~79 The guiding frame 17 comprises a sled frame assembly 25 made of structural material such as aluminum, a support 27 made of insulating material, such as wood, which supports a finger assembly made of structural material, such as steel, shown generally as 29, a knife edge blade 13 mounted on the finger assembly, which blade is electrically heated, a handle 23 attached to a metal plate 28, preferably aluminum, which ls fastened to the support 27 and a spring switch 47 (also known as a trigger switch) to provide on/off control of the power source 11 via umbilical cord 14 to supply electrlcal energy to the blade for heating.
In using the unlt, the operator ls requlred to pull swltches 45 and 47 ln such a way to preheat and malntain heat to the blade and to pull the sled arrangement 25 toward the winch. The directlon of the sled arrangement is controlled by the directional orlentation of the winch llne 20 and the operator's input via the handle.
The knlfe edge blade used ln the lnventlon must have certain characterlstlcs to make lt practlcal. The back section of the blade must be sufflclently strong for mountlng and have higher electrlcal resistant propertles than the front sectlon so as to dlrect most of the electrical current to the front edge whlch is to be heated. The front edge, however, must have good edge holding abillty and for these reasons, a blade fabrlcated from two dlsslmllar metals ls preferred. The preferred blade for use ln the lnventlon has a back section conslstlng of sprlng steel havlng a Rockwell hardness of from about 38 to about 40 and a front edge sectlon conslstlng of AISI M~2 alloy which has been treated to achieve a Rockwell C hardness of from about 65 to about 68. Such material is readlly available as lt is used to make band saw blades and the preferred knlfe edge blade for use ln the lnventlon is readily made from an appropriate length of such a band saw blade before it is toothed. It ls deslrable also to sharpen the front knlfe end sectlon of the blade and to bend the ends of the blade to provlde contact polnts for the electrlcal cords to the power source.
Referrlng now to Fig. 2, the mountlng of the knlfe edge blade 13 on flnger assembly 29 is shown in expanded detail.
The blade 13 is mounted on fingers 15 whlch extend from the front of the lnsulating support 27. The mountlng may be accomplished by means of bolts, screws, or other fasteners 31 which attach the rear portion 30 of the blade 13 to the flngers 15. The ends of the blade 13a and 13b are bent at an angle from the portion of the blade attached to the fingers to provide connection points for attaching the electric cables 12a and 12b to the knlfe edge blade.
To remove a layer of belt material from the conveyor belt, a cut is made in the upper layer of material across the length of the belt and, if the belt ls wide enough, one or more cuts are made along the length of the belt between the cro~s cut and the end of the belt. The heated knlfe edge bl~de is then positloned at one edge of the strip to be removed and as the elaEtomerlc materlal melts, lt iE pulled 2 ~ 7 9 away by hand or by attachment to a winch as shown in U.S.
BACKGROUND OF THE INVENTION
An endless conveyor belt ls made by ~olning together the er-ds of a length of belt materlal. The belt material is usually made with several plies of material (e.g., a laminate) and, in general, will have an inner ply made of cords, usually steel, extending along the length of the belt in order to prevent excessive stretching of the belt during use. In general, the conveyor belts to which this invention applles will have a central layer of steel or other metal cord covered on each side with an appropriate elastomeric material.
During use, however, damage frequently occurs to conveyor belts and lt becomes necessary to make repairs on the belt. Such repairE require that a layer of the belt material be removed. One method of removing a layer of belt material from a conveyor belt is to form a cut in the layer of materlal across the length of the belt at a predetermined distance from the end of the belt, and to form one or more cuts along the length of the belt between the cross cut and the end of the belt. The strips formed by the cuts in the layer of belt materlal then can be peeled away from the other layers of belt material. The peellng away of the Etrip of 2~1~979 material is usually done by hand or by use of a winch and the strips of material are pulled away while simultAneously cutting the adhesive or bond between the layers of material with a knife or other sharp inst.rument. Since t.he layers of the belt material are us~ally securely bonded together so that the belt will last a long time when in use, the task of stripping the outer layers at the ends of a helt is onero-]s an(~ ti.me corlsllmirlg.
DISCUSSION ~F PRIOR ART
U.S. 3,929,555 discloses a conveyor belt strlpper system ln which a winch on a portable framework ls used to pull from the belt strips of material cut by hand.
SUMMARY OF THE INVENTIO~
The present lnvention relates to an lmproved method of stripping a layer of elastomeric material from a laminated conveyor belt wherein an outer layer of the elastomer is cut into strips and the strips are pulled away from an adjacent layer of the belt, the improvement which comprises separating the elastomeric strip from the adJacent layer with a knife edge which is heated sufficiently to melt the elastomeric strip at its point of contact wlth the adJacent layer, whereby removal of the elastomeric strip is greatly facilitated.
Another embodiment of the inven~lotl is an a~r~aratus ~sed in the method of the invention which comprises, in combination, a knlfe edge adapted to contact the ~uncture of metal cord and elastomer of a laminated conveyor belt, 201 5q7q supporting means for the knife edge on a guiding frame and electrical mean~ to heat the knlfe edge to a temperature sufficient to melt the elastomeric layer.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a perspective view of the apparatus in use.
Fig. 2 is an expanded, detailed view of how the knife edge is mounted on the apparatus.
Flg. ~ ls a cross-~ectional view showlng the functlon of the knife edge.
DETAILED OESCRIPTION OF THE INVENTION
The equipment required to carry out the method of the invention will comprise a power source, an apparatus to hold and guide the knife edge and means to pull the strips of elastomer from the conveyor belt, preferably a winch or similar device which enables a controlled pull of the knife edge through the rubber at the junction of the layers of the conveyor belt. Referring now to Flg. 1, a power source 11 supplies electrlcal power through two 4/0 weldlng cables 12 and umbilical cord assembly 14 to a knlfe edge 13 through contact points 13a and 13b. The knlfe edge ls mounted on a finger assembly 29 (see detail in Fig. 2 and Fig. 3) which in turn comprise part of a guidlng apparatus shown generally as 17. A winch 19 is powered by a separate source of power thro~lgh electric cables 18 and 18a via a power controller box 21 and serles of on/off switches 41 (toggle) and A5 (Eprlng off) and a foward/reverse selector swltch 43 mounted on handle 23 of the guldlng frame 17.
201 5~79 The guiding frame 17 comprises a sled frame assembly 25 made of structural material such as aluminum, a support 27 made of insulating material, such as wood, which supports a finger assembly made of structural material, such as steel, shown generally as 29, a knife edge blade 13 mounted on the finger assembly, which blade is electrically heated, a handle 23 attached to a metal plate 28, preferably aluminum, which ls fastened to the support 27 and a spring switch 47 (also known as a trigger switch) to provide on/off control of the power source 11 via umbilical cord 14 to supply electrlcal energy to the blade for heating.
In using the unlt, the operator ls requlred to pull swltches 45 and 47 ln such a way to preheat and malntain heat to the blade and to pull the sled arrangement 25 toward the winch. The directlon of the sled arrangement is controlled by the directional orlentation of the winch llne 20 and the operator's input via the handle.
The knlfe edge blade used ln the lnventlon must have certain characterlstlcs to make lt practlcal. The back section of the blade must be sufflclently strong for mountlng and have higher electrlcal resistant propertles than the front sectlon so as to dlrect most of the electrical current to the front edge whlch is to be heated. The front edge, however, must have good edge holding abillty and for these reasons, a blade fabrlcated from two dlsslmllar metals ls preferred. The preferred blade for use ln the lnventlon has a back section conslstlng of sprlng steel havlng a Rockwell hardness of from about 38 to about 40 and a front edge sectlon conslstlng of AISI M~2 alloy which has been treated to achieve a Rockwell C hardness of from about 65 to about 68. Such material is readlly available as lt is used to make band saw blades and the preferred knlfe edge blade for use ln the lnventlon is readily made from an appropriate length of such a band saw blade before it is toothed. It ls deslrable also to sharpen the front knlfe end sectlon of the blade and to bend the ends of the blade to provlde contact polnts for the electrlcal cords to the power source.
Referrlng now to Fig. 2, the mountlng of the knlfe edge blade 13 on flnger assembly 29 is shown in expanded detail.
The blade 13 is mounted on fingers 15 whlch extend from the front of the lnsulating support 27. The mountlng may be accomplished by means of bolts, screws, or other fasteners 31 which attach the rear portion 30 of the blade 13 to the flngers 15. The ends of the blade 13a and 13b are bent at an angle from the portion of the blade attached to the fingers to provide connection points for attaching the electric cables 12a and 12b to the knlfe edge blade.
To remove a layer of belt material from the conveyor belt, a cut is made in the upper layer of material across the length of the belt and, if the belt ls wide enough, one or more cuts are made along the length of the belt between the cro~s cut and the end of the belt. The heated knlfe edge bl~de is then positloned at one edge of the strip to be removed and as the elaEtomerlc materlal melts, lt iE pulled 2 ~ 7 9 away by hand or by attachment to a winch as shown in U.S.
3,925,555.
Referring now to Fig. 3, which is a sectional view taken along line 3-~ of Fig. 2, the conveyor belt is shown as a three layer laminate; viz., a bottom elastomeric layer 33, a middle section 35 composed of steel cable and an upper elastomeric layer 37 which is pulled away as the heated blade 13 meets and melts elastomeric layer 37 at its print of attachment to the cable layer 35.
As indicated, the movement of the sled 25 is dependent upon the winch 19 which is readlly controlled by the operator using the forward/reverse selector switch q3 on control box 21. Similarly, the electrlc power to the blade may be readily controlled by a rheostat control (not shown) on the power source 11 and a spring switch ~7 in handle 23 to turn the pnwer off and on to the blade to maintain it at a desired constant heat level. The sprlng on/off swltch 47 ls used by the operator to optimize the heating of the blade during the stripplng process.
The apparatus and method of the invention greatly enhances the speed and eaEe of removing an ela~tomerlc layer from a conveyor belt and as work tlme is reduced, so is the cost of the operation. As an indication of the lmproved efflciency that the lnventlon provides, lt has heretofor required about 20 minutes to remove 10 feet of elastomer from a conveyor belt, whereas u6ing the method of the lnventlon, the same length of elastomer can be strlpped from the belt in 201~79 8 mlnutes, thus achle~lng a signlflcarlt reduction of wnrk
Referring now to Fig. 3, which is a sectional view taken along line 3-~ of Fig. 2, the conveyor belt is shown as a three layer laminate; viz., a bottom elastomeric layer 33, a middle section 35 composed of steel cable and an upper elastomeric layer 37 which is pulled away as the heated blade 13 meets and melts elastomeric layer 37 at its print of attachment to the cable layer 35.
As indicated, the movement of the sled 25 is dependent upon the winch 19 which is readlly controlled by the operator using the forward/reverse selector switch q3 on control box 21. Similarly, the electrlc power to the blade may be readily controlled by a rheostat control (not shown) on the power source 11 and a spring switch ~7 in handle 23 to turn the pnwer off and on to the blade to maintain it at a desired constant heat level. The sprlng on/off swltch 47 ls used by the operator to optimize the heating of the blade during the stripplng process.
The apparatus and method of the invention greatly enhances the speed and eaEe of removing an ela~tomerlc layer from a conveyor belt and as work tlme is reduced, so is the cost of the operation. As an indication of the lmproved efflciency that the lnventlon provides, lt has heretofor required about 20 minutes to remove 10 feet of elastomer from a conveyor belt, whereas u6ing the method of the lnventlon, the same length of elastomer can be strlpped from the belt in 201~79 8 mlnutes, thus achle~lng a signlflcarlt reduction of wnrk
Claims (5)
1. An apparatus for removing a section of elastomer from a laminated conveyor belt comprised of a central metal cord covered on each side with an elastomeric material which apparatus comprises in combination a knife blade adapted to have its front edge contact said metal cord where it meets an upper elastomeric layer of said conveyor belt, guiding means on which said knife edge is mounted and electrical means to heat said knife edge to a temperature sufficient to melt the elastomeric material of said conveyor belt.
2. The apparatus of Claim 1 wherein an electrically controlled winch is used to pull said apparatus.
3. The apparatus of Claim 1 wherein the knife blade is fabricated from two dissimilar metals, the metal blade comprising a front edge section of said blade having good edge holding ability and the metal comprising a back section of said blade having an electrical resistance higher than said front edge section.
4. The apparatus of Claim 1 wherein the knife blade is comprised of a back supporting section and a front edge section wherein the back section consists of a spring steel having a Rockwell C hardness of from about 38 to about 40 and the front edge consists of AISI M42 alloy which has been heat treated to obtain a Rockwell C
hardness of from about 65 to about 68.
hardness of from about 65 to about 68.
5. In the process of stripping an elastomeric layer from a laminated conveyor belt comprised of a central metal cord covered on each side with an elastomeric material wherein an outer layer of the elastomer is cut into strips and the strips pulled away from an adjacent layer of the belt, the improvement which comprises the steps of a) making one or more cuts in the upper layer of the elastomer across the length of the belt;
b) positioning a knife edge to contact said metal cord where it meets an upper elastomeric layer of said belt;
c) electrically heating said knife edge sufficiently to melt said elastomer;
d) pulling said heated knife edge along said cut section and e) removing the elastomeric strip.
b) positioning a knife edge to contact said metal cord where it meets an upper elastomeric layer of said belt;
c) electrically heating said knife edge sufficiently to melt said elastomer;
d) pulling said heated knife edge along said cut section and e) removing the elastomeric strip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2015979 CA2015979C (en) | 1990-05-03 | 1990-05-03 | Conveyor belt stripper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2015979 CA2015979C (en) | 1990-05-03 | 1990-05-03 | Conveyor belt stripper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2015979A1 CA2015979A1 (en) | 1991-11-03 |
| CA2015979C true CA2015979C (en) | 1997-10-07 |
Family
ID=4144905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2015979 Expired - Lifetime CA2015979C (en) | 1990-05-03 | 1990-05-03 | Conveyor belt stripper |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2015979C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7914670B2 (en) | 2004-01-09 | 2011-03-29 | Suncor Energy Inc. | Bituminous froth inline steam injection processing |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009184045A (en) * | 2008-02-05 | 2009-08-20 | Fujipura Kk | Film cutting device |
-
1990
- 1990-05-03 CA CA 2015979 patent/CA2015979C/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7914670B2 (en) | 2004-01-09 | 2011-03-29 | Suncor Energy Inc. | Bituminous froth inline steam injection processing |
| US8685210B2 (en) | 2004-01-09 | 2014-04-01 | Suncor Energy Inc. | Bituminous froth inline steam injection processing |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2015979A1 (en) | 1991-11-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |