US20010040086A1 - Self-adjusting carrying idler assembly - Google Patents
Self-adjusting carrying idler assembly Download PDFInfo
- Publication number
- US20010040086A1 US20010040086A1 US09/329,812 US32981299A US2001040086A1 US 20010040086 A1 US20010040086 A1 US 20010040086A1 US 32981299 A US32981299 A US 32981299A US 2001040086 A1 US2001040086 A1 US 2001040086A1
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- United States
- Prior art keywords
- support
- frame
- movable frame
- belt
- conveyor belt
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- 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
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- 239000000463 material Substances 0.000 description 11
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
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
- B65G39/00—Rollers, e.g. drive rollers, or arrangements thereof incorporated in roller-ways or other types of mechanical conveyors
- B65G39/10—Arrangements of rollers
- B65G39/12—Arrangements of rollers mounted on framework
- B65G39/125—Arrangements of rollers mounted on framework for selectively adjusting troughing of the conveying belt
Abstract
Description
- This invention relates generally to belt conveyor carrying idlers and more particularly to belt carrying or support idler units which are tiltable to permit the conveyor belt to move in a curved path.
- Belt conveyors of the endless belt type have long been used to move a continuous stream of granular or particulate material, particularly where the feed rates are relatively constant so that the material will fill the belt at a relatively constant or uniform rate. In order to maintain material centered on the belt, the belts are generally formed to have a flat center section and upwardly sloping side sections and therefore the support idlers over which the belt rides and which are located at spaced intervals generally consist of three rollers in a conforming configuration. While the three idler rollers may be arranged with their axes in a plane, it has been found that better support can be obtained by having the center roller shifted laterally so that the rollers may be increased in length and provide better support.
- When the conveyor extends in a straight line, the conveyor idler assemblies need not be concerned with lateral movement because the trough shaped center is automatically self centering when the belt is under tension as it is when transporting material. However, at times it is necessary to have the conveyor follow a curved path to change direction in a horizontal plane and when this occurs there is a differential tension in the belt between the inner and outer edges as a result of the curve. Thus if the conventional idler assembly were to be used on curves there would be a natural tendency of the belt to move up along the idler roller on the inside of the curve so that if the radius of curvature was other than very long with respect to the belt size, the belt would tend to run off the roller supports toward the inside of the curve. Thus it has been found necessary to provide some arrangement to provide a counteracting force on the belt to keep it centered on the rollers.
- One approach to this has been to provide edge rollers such as those shown in U.S. Pat. No. 4,917,232 which engage the edges of the belt and retain it in position. However, such arrangements not only tend to produce excessive wear along the belt edges, but they are effective only when the radius of curvature is quite large so that the differential tension between the inside and outside edges of the belt is relatively small and the belt itself is relatively rigid to prevent any lateral buckling or folding as a result of the force on the belt from the edge rollers.
- Another approach has been to tilt the belt by suspending the idler roller assembly from an upper pivot to allow the belt to swing back and forth under the load to provide a self-aligning support for the belt. This arrangement again only works in curves with a very large radius of curvature and requires a great deal of lateral space to allow movement of the suspended assembly for the necessary degree of tilt. Since such space is often not available, particularly in underground tunnels and other areas, it has been found desirable to have the belt tilt with a minimum of lateral movement. One such arrangement is disclosed in the present inventor's U.S. Pat. No. 5,341,920, granted Aug. 30, 1994. With this arrangement, the idler assembly consists of a fixed support frame having upwardly extending wheel or roller supports carrying wheels which engage tracks in the side of each of the sloping side channels of the movable support frame to support the movable frame on each side of the center line of the belt. At one side which is on the interior of the curve, is mounted a side roller to limit belt movement, and this side roller rotates about an axis perpendicular to the adjacent side member. When the assembly is mounted on a curved portion of the conveyor, the belt, because of the differential tension between the inside and outside produced by the curvature, tends to ride upward to engage the side roller and this force, together with the shifting weight of the load of material on the belt, causes the frame to tilt until the forces are in equilibrium. Because movement requires some pressure engagement between the belt edge and the side roller, the result has been a tendency of the belt to wear and even begin to delaminate along the edge under long continued usage.
- The present invention provides a self-adjusting carrying idler assembly of improved and simplified construction which minimizes the forces required to tilt the assembly when the belt is on a curve and which minimizes edge wear and other stresses on the belt itself.
- In the preferred embodiment of the present invention a generally horizontal fixed frame is provided which is supported at the ends and includes a pair of frame members spaced apart and providing a support plate between them which is positioned near the center line of the conveyor. This support plate provides an adjustable mounting for a wheel bracket which extends upward and carries a pair of spaced support rollers or wheels having an axis of rotation perpendicular to the frame and parallel to the center line of the belt. Also mounted on this support bracket is a horizontal roller having a substantially vertical axis of rotation which serves as a guide and takes any thrust along the axis the conveyor.
- A movable or cradle frame of hollow box members is mounted above the fixed frame and consists of a center section and two side sections each extending upwardly at an angle to the center section and welded together as a unitary piece. The center section has a slot in the bottom wall through which the mounting bracket extends so that the support wheels and guide wheel engage the inside surfaces of the box to allow relatively close tolerances as well as protection from foreign matter such as the material being carried on the belt to prevent possible damage or excessive wear for the wheels. Each section of the movable frame has a pair of laterally extending brackets which provide support at each end for the carrying idlers. One idler is carried on one side of the center section and the other two on the opposite sides of the two side sections, and in accordance with usual practice make an angle of about 40° with the center section to define the shape of the trough of the upper or carrying portion of the belt. On the side section at the outer end of what is to be the inside of the curve is mounted a guide roller which is positioned to be engageable by the edge of the belt to provide the necessary force to tilt the assembly to the desired degree.
- Since the movable frame is supported basically at only a single point, it is free to rock back and forth about that point, and to provide the necessary stabilization and angular positioning, a crank arm is connected between the outer edge of the support frame and the outer edge of the side section opposite the guide roller. This crank arm is of such a length that it would be close to vertical if the center section of the movable frame were exactly horizontal. However, since there is no need for the extra expense and complexity of a movable carrying idler arrangement when the belt is perfectly straight and horizontal, the support bracket carries an angle bracket which also serves as a flat stop plate and as a support for the guide roller. The stop plate is engageable by the upper wall of the box section of the center section when the unit is tilted about 5° so that the movable frame is never tilted at less than the 5° that would be the initial position at the entry or exit from a curve. On the other hand, the assembly can tilt up to a maximum of about 20° in a typical application since any higher tilt would risk the loss of some of the material being carried off the outside of the curve.
- With the present arrangement the forces required to tilt the movable frame and which are produced by the contact between the belt edge and the side roller are minimized so that the pressure on the belt edge tending the damage the belt is greatly reduced.
- Another feature is that the position of the support bracket is adjustable longitudinally along the fixed frame so that the pivot point moves with respect to the center of the belt. This, in turn, varies the force required to tilt the movable frame and compensate for changes in the radius of the curve of the belt.
- Further features and advantages of the invention become apparent upon the more complete description in the following detailed description and the drawings.
- FIG. 1 is a fragmentary perspective view of a section of a conveyor showing a plurality of the carrying idler assemblies of the present invention and a portion of the belt passing through a curve;
- FIG. 2 is a perspective view of a carrying idler assembly according to the preferred embodiment of the present invention without the conveyor belt;
- FIG. 3 is an elevational view with parts broken away of a complete carrying idler unit at minimum tilt and including the belt return support;
- FIG. 4 is a side elevational view of the unit shown in FIG. 3 but at maximum tilt;
- FIG. 5 is a bottom plan view of the assembly;
- FIG. 6 is a cross-sectional view taken on line6-6 of FIG. 3; and
- FIG. 7 is an elevational view similar to FIG. 3 but with the mounting bracket shifted to the right hand position.
- Referring now to the drawings in greater detail, FIG. 1 shows a fragmentary portion of a
conveyor assembly 10 passing around a relatively long radius curve. As shown, there are a plurality of idlerroll assembly units 11 mounted on a suitable surface such as a tunnel floor by a supporting framework which is not shown since it forms no part of the present invention. The spacing of theassemblies 11 depends upon the belt size and load of thebelt 12. This belt has acarrying portion 15 on the upper surface supported directly on rollers of each assembly as described in greater detail hereinafter. Thereturn portion 14 of the belt is supported in a flat configuration either on intermediately spacedreturn idlers 17 or such idlers may become the lower portion of eachidler roll unit 11 as shown in FIG. 3. - Each of the idler roll units comprises a
fixed frame 20 having a pair ofside members end members side members side members flat support plate 26 welded to each of the side members not only to increase the rigidity of the fixed frame but to provide a roller support to carry most of the weight of the conveyor belt and its load. As shown in FIG. 5, thesupport plate 26 is preferably mounted slightly offset toward theend member 23 and is provided with a plurality of alignedholes 27 for adjustment purposes as explained hereinafter. - A movable or
cradle frame 30 is mounted above thefixed frame 20 and includes acenter section 31 and twoside sections sections center section 31 at opposite ends are mountedbrackets 35 to support acenter roller 36 by customary anti-friction bearings with the upper surface of theroller surface 36 projecting above the top surface of thecenter section 31. In like manner, pairs ofbrackets side sections support side rollers roller 36. By placing thecenter roller 36 and theside rollers frame 30, a better support is provided for the belt and the vertical loading on the belt is distributed more evenly to minimize any lateral or twisting forces on themovable cradle 30. As shown in FIG. 3, thebelt 12 is formed so that it lies across and conforms to the threerollers center roller 36, this weight tends to be balanced by the lesser amount of material supported by theside rollers - To constrain movement of the belt when it goes around a curve as well as to provide the force to tilt the cradle frame, a
bracket 43 is mounted at the outer end of theside section 32 on the opposite side of theroller 40 and extends upward perpendicular to the top surface of the side section.Bracket 43 carries anedge roller 45 having a limitingflange 46 on the upper side to prevent the belt from moving entirely off the roller and when the belt tends to move sideways around a curve the belt moves up theside roller 40 until the edge engages theedge roller 45 which causes the cradle frame to tilt as described in greater detail hereinafter. - Both support and lateral guidance of the
cradle frame 30 is provided by a roller assembly mounted on thesupport plate 26. As best shown in FIG. 5, the bottom wall 51 ofcenter section 31 is provided with anelongated slot 53 which terminates at the one end in anenlarged opening 54 formed in thebottom wall 52 ofside section 32. A mountingbracket 56 has a base 57 which rests onsupport plate 26 and is secured thereto bybolts 58 extending through bolt holes 27. Since there are plurality of sets ofholes 27, it will be noted thatbracket 56 can be mounted at several different longitudinal locations along the fixedframe 20 to change the location of the pivot support ofcradle frame 30. Thus, FIGS. 3, 4 and 5 show one end position and FIG. 7 shows thebracket 56 at the other end position. - The mounting
bracket 56 includes a standard 60 extending upward from the base 57 in passing through theslot 53 into the interior of thecenter section 31. Theslot 53 thus serves to allow the center section and the entire cradle frame to move back and forth with respect to the mountingbracket 56 and theenlarged opening 54 provides clearance for insertion of the rest of the roller assembly carried bybracket 56 into thecenter section 31.Standard 60 at its upper end carries astub axle 61 having a horizontal axis and journalling a pair ofsupport rollers 62 which bear against thetop wall 63 ofcenter section 31. This arrangement allows the cradle frame to not only rock about the axis ofstub axle 61 but also slide longitudinally with respect to fixedframe 20 and perpendicularly to the axis of the belt.Standard 60 also carries anangle bracket 64 supporting aguide roller 65 for rotation about a nearly vertical axis to engage the side walls of thecenter section 31 and prevent lateral movement thereof. Theangle bracket 64 has anupper side 66 which extends at a slight angle of approximately 5° to the horizontal as defined by the fixedframe 20 and when the cradle is in the lower most or most nearly horizontal position, thetop wall 63 will make abutting contact with theupper side 66 and thereby limit motion of thecradle frame 30 toward the horizontal position. - To control the position and motion of the
movable frame 30, additional support and guidance is provided by a rigid link or crank arm arrangement on the side opposite theedge roller 45. On the top ofend member 24 of fixedframe 20 there is mounted abracket 70 having a pair ofupstanding ears 71 which support across pin 72. Likewise, asecond cross pin 74 is mounted between the side walls of the outer end ofside section 33 parallel to crankpin 72. Acrank arm 76 having acenter section 81 extending between ends 77 and 79 guides and anchors the movable frame. Since thecrank arm end cross pin cradle 30 has a minimum of friction allowing it to move between the positions shown in FIG. 3 and FIG. 4. - The operation of the assembly is best seen from FIGS. 3, 4 and7. Turning to FIG. 3, assuming that the load is evenly distributed on the belt, it will have an effective downward weight force in the middle of
center section 31. Since this weight tends to act, as shown in FIG. 3, to the right of thesupport rollers 62 there is little tendency for the assembly to tilt. On the other hand, if the belt is extending around a curve, as shown in FIG. 1, the belt will in effect tend to tilt outward and since the effect of the tension forces on the belt tends to move the belt toward the inside of the curve, the edge of the belt will ride up until it contacts theedge roller 45 and the resulting force applied to the cradle will tend to tilt the assembly from the bottom position shown in FIG. 3 toward the extreme tilt position shown in FIG. 4. As the frame tilts, it moves toward the left as shown in FIG. 3 and rolls upward on thesupport rollers 62 tending to move the center of gravity toward the left and as a result, this force also tends to increase the tilt. On the other hand, thecrank arm 76 changes its angularity as it moves from a near vertical position toward the horizontal so that it provides a greater restraining force to limit the tilt, so that depending upon the load on the belt and the radius of curvature the forces will come into balance and the movable frame on a curve will generally assume a position intermediate the extremes shown in FIG. 3 and 4. - The balance of forces can be changed by movement of the mounting
bracket 56 to different positions along thesupport plate 26. In FIGS. 2-6 the mountingbracket 56 has been shown as positioned in the left hand set of holes as shown in FIG. 5. If the bracket were repositioned by bolting it in the right hand position the result would be the arrangement shown in FIG. 7. As can be seen, the angular position of themovable frame 30 remains at 5° as determined by the contact between the upper wall ofcenter section 31 and theangle bracket 64 but the center of the belt is now closer to the center of thesupport roller 62 and thecrank arm 76 is now closer to a vertical position. In this position, the force required to tilt the movable frame around the curve is decreased and under the same radius of curvature and belt load the tilt will assume a higher angle and this tends to minimize the contact between the belt edge and theedge roller 45 and minimizes wear on the belt edge as a result of this contact. With the adjustablilty for the forces provided by different belt loading and different radius of curvature for the belt, the adjustment can be made by moving the position of thebracket 56 so that the assembly can operate with a minimum edge load of the belt against theedge roller 45 to produce a balanced tilt angle for the cradle with a minimum of edge force on the belt to minimize belt wear at this point. - This arrangement permits rocking of the cradle in only one direction since the
edge roller 45 must always be on the inside of the curve. However, if a curve in the opposite direction is desired, it is only necessary to mount the entire assembly with a fixed frame rotated 180° to again place the edge roller on the inside of the curve. Because of the balance of forces resulting from the center roller being on the opposite side from the two side rollers and the fact that a normal belt loading the center roller takes a vertical load equal to the sum of the loads on both side rollers it is not significant whether the center is in the leading or lagging position with regard to the direction of belt movement. By mounting the support rollers and the rest of the mechanism carried bybracket 56 within the hollow box section of thecenter section 31, this arrangement is generally shielded from any dirt or other material such as spills of material from the belt, which could interfere with proper lubrication and operation of the unit. - While the preferred embodiment of the invention has been shown and described in detail, it is recognized that various modifications and rearrangements may be resorted to without departing from the scope of the invention as defined in the claims.
Claims (12)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US09/329,812 US6390287B2 (en) | 1999-06-10 | 1999-06-10 | Self-adjusting carrying idler assembly |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US09/329,812 US6390287B2 (en) | 1999-06-10 | 1999-06-10 | Self-adjusting carrying idler assembly |
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US20010040086A1 true US20010040086A1 (en) | 2001-11-15 |
US6390287B2 US6390287B2 (en) | 2002-05-21 |
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US09/329,812 Expired - Lifetime US6390287B2 (en) | 1999-06-10 | 1999-06-10 | Self-adjusting carrying idler assembly |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006045463A3 (en) * | 2004-10-22 | 2006-06-01 | Horn Gerhard | Belt support for pipe conveyor |
WO2013134730A2 (en) * | 2012-03-08 | 2013-09-12 | Flexible Steel Lacing Company | Apparatus and method for tracking conveyor belts |
US9884730B2 (en) | 2015-11-12 | 2018-02-06 | Flexible Steel Lacing Company | Apparatus and method for tracking conveyor belts |
CN113548377A (en) * | 2021-08-09 | 2021-10-26 | 中煤科工集团上海有限公司 | Efficient deviation correcting device and method for upper carrier roller of belt conveyor |
CN114536740A (en) * | 2022-01-25 | 2022-05-27 | 河南新开源石化管道有限公司 | Bent pipe conveying device of bent pipe anticorrosion adhesive tape winding machine |
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US9233035B2 (en) * | 2005-07-28 | 2016-01-12 | Paul Baverso | Support chair for body cast patients |
EP2080720B1 (en) * | 2006-11-10 | 2013-04-03 | Bridgestone Corporation | Device for monitoring conveyor belt |
JP4458165B2 (en) * | 2007-12-28 | 2010-04-28 | 村田機械株式会社 | Conveyor |
CA2765990C (en) * | 2012-01-23 | 2014-11-18 | Frank Ivan | Guide roller for centering conveyor belts |
WO2016094033A1 (en) | 2014-12-09 | 2016-06-16 | Laitram, L.L.C. | Flexible-belt conveyor and methods of conveying |
US9550647B1 (en) | 2015-10-14 | 2017-01-24 | Xerox Corporation | Self-setting exit roll assembly |
US11072503B1 (en) * | 2020-04-28 | 2021-07-27 | Jason Heida | Discarding rail for unloading material from a continuously moving conveyor belt |
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US1815099A (en) * | 1930-01-02 | 1931-07-21 | George A Foote | Automatic belt guide |
US2575598A (en) * | 1948-04-30 | 1951-11-20 | Shank Harvey Tillman | Conveyer idler |
DE971808C (en) * | 1953-06-23 | 1959-04-02 | Buckau Wolf Maschf R | Device to ensure the straight running of conveyor belt lines |
SU609690A1 (en) * | 1976-12-21 | 1978-06-05 | Предприятие П/Я А-7225 | Centering roller support of belt conveyer |
SU797980A1 (en) * | 1977-08-15 | 1981-01-23 | Государственный Научно-Исследова-Тельский И Проектный Институт Уголь-Ной Промышленности | Belt conveyer linear section |
SU783148A1 (en) * | 1979-01-08 | 1980-11-30 | Всесоюзный научно-исследовательский и проектно-изыскательский институт по проблемам добычи, транспорта и переработки минерального сырья в промышленности строительных материалов | Cargo flow shaping device |
SU870285A1 (en) * | 1979-08-06 | 1981-10-07 | Николаевский Филиал Одесского Инженерно-Строительного Института | Roller support for centering conveyer belt |
US4917232A (en) | 1980-05-02 | 1990-04-17 | Joy Technologies Inc. | Flexible conveyor belt supporting structure |
SU1661097A1 (en) * | 1989-07-10 | 1991-07-07 | Донецкий политехнический институт | Device for centering conveyor belt |
DE69124117D1 (en) * | 1990-10-23 | 1997-02-20 | Tasman Eng Pty Ltd | DEVICE FOR CORRECTING CROSS DEVIATIONS OF A CONVEYOR BELT |
US5341920A (en) | 1993-05-12 | 1994-08-30 | Long-Airdox Company | Load sensitive conveyor training apparatus |
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- 1999-06-10 US US09/329,812 patent/US6390287B2/en not_active Expired - Lifetime
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006045463A3 (en) * | 2004-10-22 | 2006-06-01 | Horn Gerhard | Belt support for pipe conveyor |
WO2013134730A2 (en) * | 2012-03-08 | 2013-09-12 | Flexible Steel Lacing Company | Apparatus and method for tracking conveyor belts |
WO2013134730A3 (en) * | 2012-03-08 | 2014-05-30 | Flexible Steel Lacing Company | Apparatus and method for tracking conveyor belts |
US9346622B2 (en) | 2012-03-08 | 2016-05-24 | Flexible Steel Lacing Company | Apparatus and method for tracking conveyor belts |
US9884722B2 (en) | 2012-03-08 | 2018-02-06 | Flexible Steel Lacing Company | Apparatus and method for tracking conveyor belts |
US9884730B2 (en) | 2015-11-12 | 2018-02-06 | Flexible Steel Lacing Company | Apparatus and method for tracking conveyor belts |
CN113548377A (en) * | 2021-08-09 | 2021-10-26 | 中煤科工集团上海有限公司 | Efficient deviation correcting device and method for upper carrier roller of belt conveyor |
CN114536740A (en) * | 2022-01-25 | 2022-05-27 | 河南新开源石化管道有限公司 | Bent pipe conveying device of bent pipe anticorrosion adhesive tape winding machine |
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