US20060131136A1 - Conveyor belt cleaner assembly including scalper blade - Google Patents
Conveyor belt cleaner assembly including scalper blade Download PDFInfo
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- US20060131136A1 US20060131136A1 US11/015,656 US1565604A US2006131136A1 US 20060131136 A1 US20060131136 A1 US 20060131136A1 US 1565604 A US1565604 A US 1565604A US 2006131136 A1 US2006131136 A1 US 2006131136A1
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- Prior art keywords
- scalper
- blade
- engagement
- blades
- conveyor belt
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- 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
- B65G45/16—Cleaning devices comprising scrapers with scraper biasing means
Definitions
- the present invention relates in general to material handling conveyors and, more particularly, to a construction for providing scalper blades located in engagement against a conveyor belt for cleaning debris from the conveyor belt.
- the blades are formed of a polymer material, such as urethane or polyurethane, and therefor provide a degree of resiliency for permitting irregularities in the belt, such as splices, to pass while also engaging and removing debris.
- a mounting structure may be provided for the blades where the mounting structure is movably supported to bias the blades against the belt, and to reposition the blade edges as the blades wear down in order to maintain the blades in contact with the belt.
- the blades may be replaced when the blades have worn to the end of their useful life.
- the conveyor system must be taken out of operation for a period of time in order to perform servicing operations including adjustment and replacement of the blades. Accordingly, it is desirable to provide a scalper blade system in which the system adjustments are readily performed, and which provides for efficient replacement of the blades, while minimizing downtime to the conveyor system.
- a scalper blade for mounting on a scalper blade assembly including a support member defining a support surface and passages for supporting the scalper blade in engagement with a conveyor belt, the scalper blade comprising a body portion formed of an elastomeric material, and comprising an upper portion and a lower portion; the lower portion defining a base for the scalper blade, and including a rigid plate located within the lower portion; and at least one elongate engagement member extending through a lower surface of the lower portion and rigidly attached to the rigid plate for engagement in at least one passage in a support member.
- FIG. 1 is a side elevational view of the discharge end of a conveyor system including a scalper blade assembly constructed in accordance with the present invention
- FIG. 2 is an end elevational view of the conveyor system illustrated in FIG. 1 ;
- FIG. 3A is cross-sectional view of the scalper blade assembly
- FIG. 3 is a partially exploded view of a scalper blade assembly constructed in accordance with the present invention.
- FIG. 4 is an exploded view of an adjustment unit for the scalper blade assembly
- FIG. 5 is a cross-sectional view of the adjustment unit for the scalper blade assembly
- FIGS. 6-8 are interior views of the gear plate portion of the adjustment unit illustrating three positions of the pawl for engaging the gear of the adjustment unit;
- FIG. 9 is an exploded view of a blade support assembly
- FIG. 10 is an elevational view of a cam pin for the blade support assembly
- FIG. 11 is an end view of the cam pin for the blade support assembly
- FIG. 12 is a perspective view of a bearing cap for the blade support assembly
- FIG. 13 is a perspective view of the cam pin located in the bearing cap for the blade support assembly
- FIG. 14 is a side elevational view of a scalper blade
- FIG. 15 is a rear elevational view of the scalper blade of FIG. 14 ;
- FIG. 16 is bottom plan view of the scalper blade of FIG. 14 .
- an end portion of a material handling conveyor including a pair of side plates 10 , 12 mounting a conveyor roller 14 for supporting a discharge end portion of a conveyor belt 16 .
- a scalper blade assembly 18 is also mounted on the side plates 10 , 12 at a location adjacent the conveyor belt 16 for engaging the conveyor belt at a location approximately midway between the top and bottom of the conveyor roller 14 , i.e., a three o'clock position as seen in FIG. 1 .
- the scalper blade assembly 18 is provided to remove debris from the discharge end of the conveyor belt 16 and prevent or reduce the carry-back of material along the lower run of the conveyor belt 16 .
- the scalper blade assembly 18 comprises a blade support member 20 , illustrated as supporting a plurality of scalper blades 22 .
- the blade support member 20 is illustrated as an elongate member, and is supported for rotation about an elongate axis 24 of the blade support member 20 by a blade tension adjustment assembly, including adjustment units 26 , 28 .
- the adjustment units 26 , 28 are substantially similar units located at opposing ends of the blade support member 20 for providing an incrementally adjustable rotational position of the blade support member 20 and for providing a biasing tension to the scalper blades 22 , and are supported on the side plates 10 , 12 by respective mounting sleeves 30 , 32 .
- the adjustment unit 26 comprises a housing 34 including an actuator tube 36 , and a gear plate 38 rigidly attached to the actuator tube 36 .
- An input shaft 40 extends through a first end 42 of the housing 34
- an output shaft 44 extends through a second end 46 of the housing 34 and is coupled to the input shaft by a resilient coupling 48 , preferably comprising a rubber coupling having a Shore A hardness of approximately 40 to 45.
- the input shaft 40 , coupling 48 and output shaft 44 form a tensioning assembly 49 .
- an end seal 51 comprising a rubber seal is located on the second end 46 for closing off the housing 34 and preventing entry of contaminants into the housing.
- the input and output shafts 40 , 44 are supported for rotatable movement within the actuator tube 36 by respective bushings 50 , 52 , preferably comprising bushings formed of an ultra high molecular weight polyethylene (UHMWPE) material.
- the input shaft 40 includes an input end 54 formed with a non-circular shape, such as a square shape, for engagement with a tool (not shown) for applying a torque force to the input shaft 40 .
- Torque force from the input shaft 40 is transmitted through the coupling 48 to the output shaft 44 and to the blade support member 20 supported on an output end 56 of the output shaft 44 .
- the output end 56 of the output shaft is formed with a non-circular shape, such as a square shape for cooperating with an opening of corresponding shape in the blade support member 20 .
- Engagement of the blades 22 against the conveyor belt 16 operates to resist rotation of the blade support member 20 toward the conveyor belt 16 , such that a resilient tension force is produced in the coupling member 48 , which operates to maintain a biasing force
- the adjustment unit 26 is provided with a tension mechanism which is housed within the gear plate 38 .
- a gear 58 is rigidly fixed to the input shaft 40 and is located within a gear recess 60 of the gear plate 38 .
- a pawl 62 is located in a pawl recess 64 in the gear plate 38 and is supported on an actuator pin 66 extending through a bushing 68 in a passage 70 of the gear plate 38 .
- An outer end of the actuator pin 66 supports a pawl positioning lever 72 which is located against a spacing washer 74 for pivotal movement relative to the gear plate 38 . Pivotal movement of the positioning lever 72 moves the pawl 62 to one of a plurality of selectable positions relative to the gear 58 .
- a spring plunger 76 is mounted in the gear plate 38 and includes a casing 78 and a resiliently biased plunger portion 80 extending into the pawl recess 64 for engagement with a cam side of the pawl 62 .
- the spring plunger 76 operates to locate the pawl 62 in one of three positions for controlling rotation of the gear 58 and the associated tensioning assembly 49 formed by the input shaft 40 , coupling 48 and output shaft 44 .
- the pawl 62 includes a first cam detent area 82 , a second cam detent area 84 and a third cam detent area 86 for engagement with the plunger portion 80 of the spring plunger 76 .
- a first pawl tooth 88 is located in engagement with the teeth 53 of the gear 58
- a second pawl tooth 90 is located adjacent a stop wall 92 located at one side of the pawl recess 64 .
- the pawl 62 rotates in the clockwise direction, as seen in FIG. 6 , when a force is applied to rotate the gear 58 in a forward counterclockwise direction, with the second pawl tooth 90 moving in a direction away from the stop wall 92 to permit the first pawl tooth 88 to move away from the gear 58 in a ratcheting action as the gear 58 rotates.
- the first pawl tooth 88 includes a curved or ramp-like surface 94 for facilitating movement of the gear teeth 53 past the first pawl tooth 88 during rotation of the gear 58 in the forward direction.
- a stop surface 100 on the second pawl tooth 90 engages against the stop wall 92 and a stop surface 96 on the first pawl tooth 88 engages against the gear teeth 53 to prevent rotation of the gear 58 in the reverse direction.
- FIG. 7 illustrates the pawl position with the lever 72 positioned in a reverse position to locate the second cam detent area 84 engaged with the plunger portion 80 , such that the second pawl tooth 90 is located in engagement with the teeth 53 of the gear 58 , and the first pawl tooth 88 is located adjacent the stop wall 92 .
- the pawl 62 rotates in the counterclockwise direction, as seen in FIG. 7 , when a force is applied to rotate the gear 58 in the reverse clockwise direction, with the first pawl tooth 88 moving in a direction away from the stop wall 92 to permit the second pawl tooth 90 to move away from the gear 58 in a ratcheting action as the gear 58 rotates.
- the second pawl tooth 90 includes a curved or ramp-like surface 98 for facilitating movement of the gear teeth 53 past the second pawl tooth 90 during rotation of the gear in the reverse direction.
- the stop surface 96 of the first pawl tooth 88 engages against the stop wall 92 and the stop surface 100 on the second pawl tooth 90 engages against the gear teeth 53 to prevent rotation of the gear 58 in the forward direction.
- the plunger portion 80 cooperates with the respective cam detent areas 82 , 84 to resiliently maintain the pawl 62 in the selected position while permitting limited pivoting movement of the pawl 62 in response to passage of the gear teeth 53 during unidirectional ratcheting movement of the gear 58 .
- FIG. 8 illustrates a neutral position of the lever 72 to position the third cam detent area 86 in engagement with the plunger portion 80 .
- both the first and second pawl teeth 88 , 90 are located out of engagement with the gear 58 , such that the gear 58 and associated tensioning assembly 49 may freely rotate in either direction.
- the gear recess 60 and pawl recess 64 in the gear plate 38 are covered by a clamping plate 102 , with a rubber seal 104 located between the gear plate 38 and the clamping plate 102 .
- Threaded studs 106 are rigidly fastened in the gear plate 38 and extend through apertures 108 in the clamping plate 102 , and the clamping plate 102 is held in position by nuts 110 engaged on the ends of the studs 106 .
- the end 54 of the input shaft 40 is rotated in an appropriate direction, such as counterclockwise as viewed in FIG. 6 , to pivot the blade support member 20 in a direction to bias the blades 22 against the conveyor belt 16 with a desired tension.
- the lever 72 is positioned in the forward tension position to engage the first pawl tooth 88 with the teeth 53 of the gear 58 .
- the nuts 110 are loosely engaged on the ends of the studs 106 such that the clamping plate 102 and seal 104 are loosely engaged adjacent the gear plate 38 .
- the nuts 110 are tightened to cause an inner surface 112 of the clamping plate 102 to frictionally engage and press against a front face 114 of the gear 58 to press a rear face 116 of the gear 58 against an inner surface 118 of the gear recess 60 . Accordingly, the gear 58 is clamped between the clamping plate 102 and the gear plate 38 to clamp the position of the input shaft 40 such that during operation of the blades 22 to scape debris from the conveyor belt 16 , shock forces from the blade support 20 will be transferred through the tensioning assembly 49 to the gear 58 and directly from the gear 58 to the housing 34 of the adjustment unit 26 .
- the adjustment unit 26 comprises two locating mechanisms in which one provides for incremental adjustment of tension on the blades 22 and the other provides a locking function for maintaining the selected adjustment position.
- the pawl 62 and cooperating teeth 53 of the gear 58 are relieved of carrying a substantial portion of forces imparted to the blades 22 and transmitted between the support member 20 and the housing 34 .
- substantially identical adjustment units 26 and 28 may be provided on either side of the support member 20 for exerting a biasing force to tension the blades 22 against the conveyor belt 16 .
- the adjustment unit 26 may be provided on the left side of the conveyor belt 16 and the substantially identical second unit 28 may be provided on the right side of the conveyor 16 .
- the positions of the lever 72 for forward and reverse rotation of the gear 58 in the second unit 28 will be reversed, such that the lever 72 will be moved to engage the plunger portion 80 in the second cam detent area 84 for rotation in a forward direction for tensioning the blades 22 , and to engage in the first cam detent area 82 to provide ratcheting movement of the gear 58 in the reverse direction.
- the blade support member 20 comprises a tubular upper member 120 rigidly attached, such as by welding, to a tubular lower member 122 .
- the upper member 120 is illustrated as a square tubular member having a plurality of upper holes 124 in an upper support surface 126 , and a plurality of lower holes 128 formed in a lower side 130 and aligned with the upper holes 124 .
- the lower member 122 is illustrated as a square tubular member having an upper side 132 formed with a plurality of holes 134 , and attached adjacent the lower side 130 of the upper member 120 , with the holes 134 aligned with the upper and lower holes 124 , 128 of the upper member 120 .
- the holes 124 , 128 and 134 have substantially the same diameter.
- the upper member 120 defines an inner circumference which is sized to fit over the output ends 56 of the output shafts 54 for mounting the support member 20 on the adjustment units 26 , 28 .
- the upper member 120 and output ends 56 are maintained in associated with each other by fasteners 131 extending through aligned holes 133 and 135 in the upper member 120 and output ends 56 , respectively.
- a locking member 136 is located within the lower member 122 and, in the present example, is illustrated as a tubular member of circular cross-section.
- the locking member 136 includes a plurality of openings 138 axially aligned with the holes 124 , 128 and 134 .
- the openings 138 are formed as key hole openings, where each opening comprises an enlarged, generally circular portion 140 having a diameter substantially similar to the diameter of the holes 124 , 128 and 134 .
- An elongate slot portion 142 is located extending circumferentially from each of the circular portions 140 , where the slot portions 142 define a width less than the diameter of the circular portions 140 .
- the locking member 136 is located for rotation within the lower member 122 by cam pins 144 .
- the cam pins 144 have an inner end 145 located within respective ends of the locking member 136 and the cam pins 144 are held in place by pins (not shown) extending through holes 148 in the cam pins 144 and aligned holes 146 in the locking member 136 .
- Bearings 150 are positioned over a central portion 152 of the cam pins 144 , and the assembled cam pins 144 and bearings 150 are located within bearing caps 154 ( FIGS. 12 and 13 ), where the cam pins 144 are rotatable relative to the bearing caps 154 .
- the bearing caps 154 are shown as including generally square end portions 156 which are positioned within the ends of the lower member 122 to thereby provide support for the locking member 136 .
- a bearing cap 154 is illustrated for use on either side of the support member 20 . It can be seen that the end portion 156 defines a circular opening 158 through which the cam pin 144 passes.
- the opening 158 is offset relative to two adjacent sides of the bearing cap 154 . Specifically, the position of the opening 158 is offset closer to a side L of the bearing cap 154 and is additionally offset closer to a side R of the bearing cap 154 .
- the side L is positioned facing horizontally to the rear, i.e., adjacent a rear side 160 , of the support member 122 .
- the bearing cap 154 When the bearing cap 154 is mounted in the right side of the lower member 122 , the side R is positioned facing horizontally adjacent a rear side 160 of the support member 122 .
- the openings 158 on the left and right side of the lower member 122 is offset toward the upper side 132 and the rear side 160 of the lower member 122 .
- each cam pin 144 is offset or eccentric relative to the central axis of the central portion 152 of the cam pin 144 , such that rotation of the cam pin 144 within the opening 158 operates to move the inner end 145 , and thus the locking member 136 , in a direction transverse to an elongate axis of the locking member 136 .
- an outer end 162 of the cam pin 144 is rotatable through 90° of movement, which movement will move the locking member 136 in a transverse direction away from the upper side 132 of the lower member 122 .
- the bearing cap 154 is preferably provided with an indicia indicating the side of the bearing cap 154 to be placed in the rearward facing position and thereby facilitate use of a common bearing cap 154 on either side of the lower member 122 .
- the side L of the bearing cap 154 may be provided with an “L” and the side R of the bearing cap 154 may be provided with an “R” as indicia indicating the proper orientation of the bearing cap 154 on the lower member 122 .
- opposing flat sides 164 , 166 of the outer end 160 are provided with indicia.
- the flat sides 164 and 166 may be provided with the indicia “L” and “R”, where the left cam pin 144 is located with the “L” facing upwardly in a first, non-operational position and is located aligned with the “L” side of the bearing cap in a second, operational position of the cam pin 144 (see FIG. 13 ).
- the cam pin 144 on the right side of the lower member 122 will be located with the “R” indicia facing upwardly in a first, non-operational position of the cam pin 144 , and will be located aligned with the “R” side of the right side bearing cap 154 in a second, operational position of the cam pin 144 .
- the cam pin 144 is provided with a hole 168 located adjacent the outer end 160 , where the cam pin hole 168 is aligned with one of two through holes 170 or 172 in the bearing cap 154 when the cam pins 144 have been rotated to the operational position on the left and right side, respectively, of the lower member 122 . Further, when the cam pins 144 are located in the operational position, a blade locking pin 174 ( FIG. 3 ) is inserted through the aligned holes 168 and 170 or 172 to lock the locking member 136 in the operational position.
- the scalper blades 22 each comprise a body 176 formed of an elastomeric material, preferably rubber, and elongate engagement members, illustrated as a pair of rigid metal engagement pins 178 extending from a lower side of the body 176 .
- the engagement pins 178 are formed with a diameter which permits the pins 178 to pass in a close tolerance fit through the holes 124 , 128 and 134 in the upper and lower members 120 , 122 of the support member 20 .
- the engagement pins 178 include a groove area 180 defining an upwardly facing land surface 182 .
- Each scalper blade 22 is located on the support member 20 with a lower surface 184 of the scalper blade 22 positioned on the support surface 126 and lower ends of the engagement pins 178 extending into the locking member 136 .
- the locking member is rotated to position the generally circular portions 140 in alignment with the holes 124 , 128 and 134 , and insertion of the lower ends of the engagement pins 178 though the locking member 136 positions the groove areas 180 adjacent the circular wall of the locking member 136 .
- the elongate slot portions 142 of the locking member 136 define a width less than the diameter of the engagement pins 178 , but large enough to permit passage of the groove areas 180 though the slot portions 142 .
- the scalper blades 22 are locked in position by rotation of the cam pins 144 from the non-operational position to the operational position, causing the locking member 136 to rotate and engage the slot portions 142 of the locking member 136 with the groove areas 180 of the engagement pins 178 , such that the land surfaces 182 face and engage an inner wall surface of the locking member 136 to prevent removal of the scalper blades 22 from the support member 20 .
- the length of the openings 138 in the locking member is such that only approximately 90° rotation of the locking member 136 is permitted from the non-operational to the operational position.
- rotation of the cam pins 144 also results in transverse movement of the locking member 136 away from the support surface 126 , the lower surface 184 of each scalper blade 22 is drawn downwardly into tight engagement against the support surface 126 .
- the engagement pins 178 engage within the holes 124 , 128 and 134 (see FIG. 3A ) in a close tolerance fit to provide a structure for holding the engagement pins 178 at longitudinally spaced locations along the pins 178 for resisting lateral loads applied against the scalper blades 22 during use in association with the conveyor belt 16 , which structure is separate from the structure of the locking member 136 for maintaining the blades 22 in engagement on the support member 20 .
- the structure for locking the scalper blades 22 in place on the support member 20 enables all of the blades 22 to be locked or unlocked on the support member 20 simultaneously through movement of a single member, i.e., through rotation of the locking member 136 .
- the present structure facilitates a reduction in maintenance time associated with installation and removal of the blades 22 .
- each scalper blade 22 is formed with seal portions comprising ribs 186 extending from the lower surface 184 for engaging and forming a seal around the engagement pins 178 and holes 124 in the upper surface 126 .
- front and rear flaps or skirts 188 , 200 extend from front and rear sides 202 , 204 of the scalper blade 22 for engaging over front and rear side edges 206 , 208 of the upper member 120 .
- the ribs 186 and skirts 188 , 200 function to seal out contaminants from entering the interior of the upper and lower members 120 , 122 through the holes 124 , and thereby protects the locking member 136 from being affected by contaminants.
- the scalper blade body 176 includes a metal plate 210 located within a lower, base portion 212 of the body 176 .
- the engagement pins 178 are attached to the plate 210 , preferably by welding, and the plate 212 is molded within the base portion 212 during formation of the scalper blade 22 to provide a firm attachment structure between the engagement pins 178 and the elastomeric material of the blade 22 .
- An upper portion 214 of the scalper blade body 176 angles forwardly from the base portion 212 , and the front and rear sides 202 , 204 converge toward each other in a direction toward a blunt engagement edge 216 .
- the base portion 212 is formed as a wide block-like structure, having the front and rear sides 202 , 204 formed as substantially parallel vertical surfaces, for providing a generally rigid lower support for the elongated upper portion 214 .
- the rear side 204 of the upper portion 214 includes an indicia, such as a rib 218 , indicating a wear point on the scalper blade 22 when the blade 22 should be replaced.
- the adjustment units 26 , 28 may be operated to pivot the scalper blade support member 20 forward, and to tension the scalper blades 22 against the conveyor belt 16 .
- a predetermined torque force applied to the blades 22 through the support member 20 may be provided through the resilient couplings 48 which will elastically deform as tension in applied through the input shaft 40 to the output shaft 44 .
- the resilient material of the blades 22 and the resilient material of the couplings 48 provide two resilient structures for absorbing shock loads applied to the blades 22 .
- the pawl positioning lever 72 may be moved to the neutral position to permit free pivotal movement of the support member 20 away from the conveyor belt 16 .
- the pawls 62 may be located to a position engaging the gear 58 to limit the support assembly 20 to a stationary position and thereby facilitate application of a torque force for turning the locking member 136 .
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Abstract
Description
- 1. Field of the Invention
- The present invention relates in general to material handling conveyors and, more particularly, to a construction for providing scalper blades located in engagement against a conveyor belt for cleaning debris from the conveyor belt.
- 2. Description of Related Technology
- Transportation of a materials, such as materials in a mining operation, is often accomplished through use of a conveyor belt system. In use, material is loaded on the conveyor belt at a loading location and the conveyor belt carries the material to another location where the material is unloaded. During this process, some of the material may adhere to or otherwise accumulate on the surface of the conveyor belt, resulting in the material being carried back to the loading location. In being carried back, the material may drop off the conveyor, resulting in an undesirable accumulation of debris beneath the conveyor, or may remain adhered to the conveyor, potentially interfering with the continued operation of the conveyor. Accordingly, scalper blades are often located at the discharge end of the conveyor in order to scrape debris from the belt as the belt passes down to the return run of the conveyor.
- Typically, the blades are formed of a polymer material, such as urethane or polyurethane, and therefor provide a degree of resiliency for permitting irregularities in the belt, such as splices, to pass while also engaging and removing debris. A mounting structure may be provided for the blades where the mounting structure is movably supported to bias the blades against the belt, and to reposition the blade edges as the blades wear down in order to maintain the blades in contact with the belt. In addition, the blades may be replaced when the blades have worn to the end of their useful life. Generally, the conveyor system must be taken out of operation for a period of time in order to perform servicing operations including adjustment and replacement of the blades. Accordingly, it is desirable to provide a scalper blade system in which the system adjustments are readily performed, and which provides for efficient replacement of the blades, while minimizing downtime to the conveyor system.
- In one aspect of the invention, a scalper blade is provided for mounting on a scalper blade assembly including a support member defining a support surface and passages for supporting the scalper blade in engagement with a conveyor belt, the scalper blade comprising a body portion formed of an elastomeric material, and comprising an upper portion and a lower portion; the lower portion defining a base for the scalper blade, and including a rigid plate located within the lower portion; and at least one elongate engagement member extending through a lower surface of the lower portion and rigidly attached to the rigid plate for engagement in at least one passage in a support member.
- Other features and advantages of the invention will be apparent from the following description, the accompanying drawings and the appended claims.
-
FIG. 1 is a side elevational view of the discharge end of a conveyor system including a scalper blade assembly constructed in accordance with the present invention; -
FIG. 2 is an end elevational view of the conveyor system illustrated inFIG. 1 ; -
FIG. 3A is cross-sectional view of the scalper blade assembly; -
FIG. 3 is a partially exploded view of a scalper blade assembly constructed in accordance with the present invention; -
FIG. 4 is an exploded view of an adjustment unit for the scalper blade assembly; -
FIG. 5 is a cross-sectional view of the adjustment unit for the scalper blade assembly; -
FIGS. 6-8 are interior views of the gear plate portion of the adjustment unit illustrating three positions of the pawl for engaging the gear of the adjustment unit; -
FIG. 9 is an exploded view of a blade support assembly; -
FIG. 10 is an elevational view of a cam pin for the blade support assembly; -
FIG. 11 is an end view of the cam pin for the blade support assembly; -
FIG. 12 is a perspective view of a bearing cap for the blade support assembly; -
FIG. 13 is a perspective view of the cam pin located in the bearing cap for the blade support assembly; -
FIG. 14 is a side elevational view of a scalper blade; -
FIG. 15 is a rear elevational view of the scalper blade ofFIG. 14 ; and -
FIG. 16 is bottom plan view of the scalper blade ofFIG. 14 . - Referring to
FIGS. 1 and 2 , an end portion of a material handling conveyor is illustrated including a pair ofside plates conveyor roller 14 for supporting a discharge end portion of aconveyor belt 16. Ascalper blade assembly 18 is also mounted on theside plates conveyor belt 16 for engaging the conveyor belt at a location approximately midway between the top and bottom of theconveyor roller 14, i.e., a three o'clock position as seen inFIG. 1 . Thescalper blade assembly 18 is provided to remove debris from the discharge end of theconveyor belt 16 and prevent or reduce the carry-back of material along the lower run of theconveyor belt 16. - Referring additionally to
FIG. 3 , thescalper blade assembly 18 comprises ablade support member 20, illustrated as supporting a plurality ofscalper blades 22. Theblade support member 20 is illustrated as an elongate member, and is supported for rotation about anelongate axis 24 of theblade support member 20 by a blade tension adjustment assembly, includingadjustment units adjustment units blade support member 20 for providing an incrementally adjustable rotational position of theblade support member 20 and for providing a biasing tension to thescalper blades 22, and are supported on theside plates respective mounting sleeves - Referring to
FIGS. 4 and 5 , theadjustment unit 26 is illustrated, it being understood that theadjustment unit 28 is of substantially similar construction, including components corresponding to those described below for theunit 26. Theadjustment unit 26 comprises ahousing 34 including anactuator tube 36, and agear plate 38 rigidly attached to theactuator tube 36. Aninput shaft 40 extends through afirst end 42 of thehousing 34, and anoutput shaft 44 extends through asecond end 46 of thehousing 34 and is coupled to the input shaft by aresilient coupling 48, preferably comprising a rubber coupling having a Shore A hardness of approximately 40 to 45. Theinput shaft 40,coupling 48 andoutput shaft 44 form atensioning assembly 49. In addition, anend seal 51 comprising a rubber seal is located on thesecond end 46 for closing off thehousing 34 and preventing entry of contaminants into the housing. - The input and
output shafts actuator tube 36 byrespective bushings input shaft 40 includes aninput end 54 formed with a non-circular shape, such as a square shape, for engagement with a tool (not shown) for applying a torque force to theinput shaft 40. Torque force from theinput shaft 40 is transmitted through thecoupling 48 to theoutput shaft 44 and to theblade support member 20 supported on anoutput end 56 of theoutput shaft 44. Theoutput end 56 of the output shaft is formed with a non-circular shape, such as a square shape for cooperating with an opening of corresponding shape in theblade support member 20. Engagement of theblades 22 against theconveyor belt 16 operates to resist rotation of theblade support member 20 toward theconveyor belt 16, such that a resilient tension force is produced in thecoupling member 48, which operates to maintain a biasing force against theblades 22. - The
adjustment unit 26 is provided with a tension mechanism which is housed within thegear plate 38. Agear 58 is rigidly fixed to theinput shaft 40 and is located within agear recess 60 of thegear plate 38. Apawl 62 is located in apawl recess 64 in thegear plate 38 and is supported on anactuator pin 66 extending through abushing 68 in apassage 70 of thegear plate 38. An outer end of theactuator pin 66 supports apawl positioning lever 72 which is located against aspacing washer 74 for pivotal movement relative to thegear plate 38. Pivotal movement of thepositioning lever 72 moves thepawl 62 to one of a plurality of selectable positions relative to thegear 58. Aspring plunger 76 is mounted in thegear plate 38 and includes a casing 78 and a resilientlybiased plunger portion 80 extending into thepawl recess 64 for engagement with a cam side of thepawl 62. - Referring to
FIGS. 6-8 , thespring plunger 76 operates to locate thepawl 62 in one of three positions for controlling rotation of thegear 58 and the associatedtensioning assembly 49 formed by theinput shaft 40,coupling 48 andoutput shaft 44. Thepawl 62 includes a first camdetent area 82, a second camdetent area 84 and a third camdetent area 86 for engagement with theplunger portion 80 of thespring plunger 76. When thelever 72 is pivoted to locate the first camdetent area 82 in engagement with theplunger portion 80, afirst pawl tooth 88 is located in engagement with theteeth 53 of thegear 58, and asecond pawl tooth 90 is located adjacent astop wall 92 located at one side of thepawl recess 64. Thepawl 62 rotates in the clockwise direction, as seen inFIG. 6 , when a force is applied to rotate thegear 58 in a forward counterclockwise direction, with thesecond pawl tooth 90 moving in a direction away from thestop wall 92 to permit thefirst pawl tooth 88 to move away from thegear 58 in a ratcheting action as thegear 58 rotates. Thefirst pawl tooth 88 includes a curved or ramp-like surface 94 for facilitating movement of thegear teeth 53 past thefirst pawl tooth 88 during rotation of thegear 58 in the forward direction. When a force is applied to rotate thegear 58 in a reverse clockwise direction, astop surface 100 on thesecond pawl tooth 90 engages against thestop wall 92 and astop surface 96 on thefirst pawl tooth 88 engages against thegear teeth 53 to prevent rotation of thegear 58 in the reverse direction. -
FIG. 7 illustrates the pawl position with thelever 72 positioned in a reverse position to locate the secondcam detent area 84 engaged with theplunger portion 80, such that thesecond pawl tooth 90 is located in engagement with theteeth 53 of thegear 58, and thefirst pawl tooth 88 is located adjacent thestop wall 92. Thepawl 62 rotates in the counterclockwise direction, as seen inFIG. 7 , when a force is applied to rotate thegear 58 in the reverse clockwise direction, with thefirst pawl tooth 88 moving in a direction away from thestop wall 92 to permit thesecond pawl tooth 90 to move away from thegear 58 in a ratcheting action as thegear 58 rotates. Thesecond pawl tooth 90 includes a curved or ramp-like surface 98 for facilitating movement of thegear teeth 53 past thesecond pawl tooth 90 during rotation of the gear in the reverse direction. When a force is applied to rotate thegear 58 in the forward counterclockwise direction, thestop surface 96 of thefirst pawl tooth 88 engages against thestop wall 92 and thestop surface 100 on thesecond pawl tooth 90 engages against thegear teeth 53 to prevent rotation of thegear 58 in the forward direction. In the positions of thepawl 62 illustrated inFIGS. 6 and 7 , theplunger portion 80 cooperates with the respectivecam detent areas pawl 62 in the selected position while permitting limited pivoting movement of thepawl 62 in response to passage of thegear teeth 53 during unidirectional ratcheting movement of thegear 58. -
FIG. 8 illustrates a neutral position of thelever 72 to position the thirdcam detent area 86 in engagement with theplunger portion 80. In the neutral position, both the first andsecond pawl teeth gear 58, such that thegear 58 and associatedtensioning assembly 49 may freely rotate in either direction. - It should be noted that in the above-described adjustment structure, other elements equivalent to the
gear 58 andpawl 62 may be provided, such as member including detent areas or other structure for engaging with thepawl 62 or a similar element. - Referring to
FIGS. 4 and 5 , thegear recess 60 andpawl recess 64 in thegear plate 38 are covered by aclamping plate 102, with arubber seal 104 located between thegear plate 38 and theclamping plate 102. Threadedstuds 106 are rigidly fastened in thegear plate 38 and extend throughapertures 108 in theclamping plate 102, and theclamping plate 102 is held in position bynuts 110 engaged on the ends of thestuds 106. - During a blade tensioning operation, the
end 54 of theinput shaft 40 is rotated in an appropriate direction, such as counterclockwise as viewed inFIG. 6 , to pivot theblade support member 20 in a direction to bias theblades 22 against theconveyor belt 16 with a desired tension. In such a tensioning operation, thelever 72 is positioned in the forward tension position to engage thefirst pawl tooth 88 with theteeth 53 of thegear 58. In addition, during the tensioning operation, thenuts 110 are loosely engaged on the ends of thestuds 106 such that the clampingplate 102 and seal 104 are loosely engaged adjacent thegear plate 38. - When the
gear 58 has been rotated to obtain the desired tensioning force biasing theblades 22 against theconveyor belt 16, thenuts 110 are tightened to cause aninner surface 112 of theclamping plate 102 to frictionally engage and press against afront face 114 of thegear 58 to press arear face 116 of thegear 58 against aninner surface 118 of thegear recess 60. Accordingly, thegear 58 is clamped between the clampingplate 102 and thegear plate 38 to clamp the position of theinput shaft 40 such that during operation of theblades 22 to scape debris from theconveyor belt 16, shock forces from theblade support 20 will be transferred through thetensioning assembly 49 to thegear 58 and directly from thegear 58 to thehousing 34 of theadjustment unit 26. Thus, theadjustment unit 26 comprises two locating mechanisms in which one provides for incremental adjustment of tension on theblades 22 and the other provides a locking function for maintaining the selected adjustment position. In this manner, thepawl 62 and cooperatingteeth 53 of thegear 58 are relieved of carrying a substantial portion of forces imparted to theblades 22 and transmitted between thesupport member 20 and thehousing 34. - It should be understood that substantially
identical adjustment units support member 20 for exerting a biasing force to tension theblades 22 against theconveyor belt 16. For example theadjustment unit 26 may be provided on the left side of theconveyor belt 16 and the substantially identicalsecond unit 28 may be provided on the right side of theconveyor 16. However, the positions of thelever 72 for forward and reverse rotation of thegear 58 in thesecond unit 28 will be reversed, such that thelever 72 will be moved to engage theplunger portion 80 in the secondcam detent area 84 for rotation in a forward direction for tensioning theblades 22, and to engage in the firstcam detent area 82 to provide ratcheting movement of thegear 58 in the reverse direction. - Referring to
FIGS. 3, 3A and 9, theblade support member 20 comprises a tubularupper member 120 rigidly attached, such as by welding, to a tubularlower member 122. Theupper member 120 is illustrated as a square tubular member having a plurality ofupper holes 124 in anupper support surface 126, and a plurality oflower holes 128 formed in alower side 130 and aligned with theupper holes 124. Thelower member 122 is illustrated as a square tubular member having anupper side 132 formed with a plurality ofholes 134, and attached adjacent thelower side 130 of theupper member 120, with theholes 134 aligned with the upper andlower holes upper member 120. Theholes upper member 120 defines an inner circumference which is sized to fit over the output ends 56 of theoutput shafts 54 for mounting thesupport member 20 on theadjustment units upper member 120 and output ends 56 are maintained in associated with each other byfasteners 131 extending through alignedholes upper member 120 and output ends 56, respectively. - A locking
member 136 is located within thelower member 122 and, in the present example, is illustrated as a tubular member of circular cross-section. The lockingmember 136 includes a plurality ofopenings 138 axially aligned with theholes openings 138 are formed as key hole openings, where each opening comprises an enlarged, generallycircular portion 140 having a diameter substantially similar to the diameter of theholes elongate slot portion 142 is located extending circumferentially from each of thecircular portions 140, where theslot portions 142 define a width less than the diameter of thecircular portions 140. - Referring additionally to
FIGS. 10 and 11 , the lockingmember 136 is located for rotation within thelower member 122 by cam pins 144. The cam pins 144 have aninner end 145 located within respective ends of the lockingmember 136 and the cam pins 144 are held in place by pins (not shown) extending throughholes 148 in the cam pins 144 and alignedholes 146 in the lockingmember 136.Bearings 150 are positioned over acentral portion 152 of the cam pins 144, and the assembled cam pins 144 andbearings 150 are located within bearing caps 154 (FIGS. 12 and 13 ), where the cam pins 144 are rotatable relative to the bearing caps 154. The bearing caps 154 are shown as including generallysquare end portions 156 which are positioned within the ends of thelower member 122 to thereby provide support for the lockingmember 136. - Referring to
FIG. 12 , abearing cap 154 is illustrated for use on either side of thesupport member 20. It can be seen that theend portion 156 defines acircular opening 158 through which thecam pin 144 passes. Theopening 158 is offset relative to two adjacent sides of thebearing cap 154. Specifically, the position of theopening 158 is offset closer to a side L of thebearing cap 154 and is additionally offset closer to a side R of thebearing cap 154. When thebearing cap 154 is mounted in the left side of thelower member 122, the side L is positioned facing horizontally to the rear, i.e., adjacent arear side 160, of thesupport member 122. When thebearing cap 154 is mounted in the right side of thelower member 122, the side R is positioned facing horizontally adjacent arear side 160 of thesupport member 122. Thus, theopenings 158 on the left and right side of thelower member 122 is offset toward theupper side 132 and therear side 160 of thelower member 122. - Referring to
FIG. 11 , the central axis of theinner end 145 of eachcam pin 144 is offset or eccentric relative to the central axis of thecentral portion 152 of thecam pin 144, such that rotation of thecam pin 144 within theopening 158 operates to move theinner end 145, and thus the lockingmember 136, in a direction transverse to an elongate axis of the lockingmember 136. Specifically, an outer end 162 of thecam pin 144 is rotatable through 90° of movement, which movement will move the lockingmember 136 in a transverse direction away from theupper side 132 of thelower member 122. - As seen in
FIG. 12 , thebearing cap 154 is preferably provided with an indicia indicating the side of thebearing cap 154 to be placed in the rearward facing position and thereby facilitate use of acommon bearing cap 154 on either side of thelower member 122. For example, the side L of thebearing cap 154 may be provided with an “L” and the side R of thebearing cap 154 may be provided with an “R” as indicia indicating the proper orientation of thebearing cap 154 on thelower member 122. Similarly, in order to locate the eccentricinner end 145 of thecam pin 144 in the correct orientation within eachrespective bearing cap 154, opposingflat sides outer end 160 are provided with indicia. For example, theflat sides left cam pin 144 is located with the “L” facing upwardly in a first, non-operational position and is located aligned with the “L” side of the bearing cap in a second, operational position of the cam pin 144 (seeFIG. 13 ). Similarly, thecam pin 144 on the right side of thelower member 122 will be located with the “R” indicia facing upwardly in a first, non-operational position of thecam pin 144, and will be located aligned with the “R” side of the rightside bearing cap 154 in a second, operational position of thecam pin 144. - The
cam pin 144 is provided with ahole 168 located adjacent theouter end 160, where thecam pin hole 168 is aligned with one of two throughholes bearing cap 154 when the cam pins 144 have been rotated to the operational position on the left and right side, respectively, of thelower member 122. Further, when the cam pins 144 are located in the operational position, a blade locking pin 174 (FIG. 3 ) is inserted through the alignedholes member 136 in the operational position. - Referring to
FIGS. 14-16 , thescalper blades 22 each comprise abody 176 formed of an elastomeric material, preferably rubber, and elongate engagement members, illustrated as a pair of rigid metal engagement pins 178 extending from a lower side of thebody 176. The engagement pins 178 are formed with a diameter which permits thepins 178 to pass in a close tolerance fit through theholes lower members support member 20. The engagement pins 178 include agroove area 180 defining an upwardly facingland surface 182. Eachscalper blade 22 is located on thesupport member 20 with alower surface 184 of thescalper blade 22 positioned on thesupport surface 126 and lower ends of the engagement pins 178 extending into the lockingmember 136. In an installation operation for placing thescalper blades 22 on thesupport member 20, the locking member is rotated to position the generallycircular portions 140 in alignment with theholes member 136 positions thegroove areas 180 adjacent the circular wall of the lockingmember 136. - The
elongate slot portions 142 of the lockingmember 136 define a width less than the diameter of the engagement pins 178, but large enough to permit passage of thegroove areas 180 though theslot portions 142. Thescalper blades 22 are locked in position by rotation of the cam pins 144 from the non-operational position to the operational position, causing the lockingmember 136 to rotate and engage theslot portions 142 of the lockingmember 136 with thegroove areas 180 of the engagement pins 178, such that the land surfaces 182 face and engage an inner wall surface of the lockingmember 136 to prevent removal of thescalper blades 22 from thesupport member 20. The length of theopenings 138 in the locking member is such that only approximately 90° rotation of the lockingmember 136 is permitted from the non-operational to the operational position. In addition, as rotation of the cam pins 144 also results in transverse movement of the lockingmember 136 away from thesupport surface 126, thelower surface 184 of eachscalper blade 22 is drawn downwardly into tight engagement against thesupport surface 126. - It should be understood that the engagement pins 178 engage within the
holes FIG. 3A ) in a close tolerance fit to provide a structure for holding the engagement pins 178 at longitudinally spaced locations along thepins 178 for resisting lateral loads applied against thescalper blades 22 during use in association with theconveyor belt 16, which structure is separate from the structure of the lockingmember 136 for maintaining theblades 22 in engagement on thesupport member 20. - It should also be noted that the structure for locking the
scalper blades 22 in place on thesupport member 20 enables all of theblades 22 to be locked or unlocked on thesupport member 20 simultaneously through movement of a single member, i.e., through rotation of the lockingmember 136. The present structure facilitates a reduction in maintenance time associated with installation and removal of theblades 22. - Referring to
FIG. 16 , thelower surface 184 of eachscalper blade 22 is formed with sealportions comprising ribs 186 extending from thelower surface 184 for engaging and forming a seal around the engagement pins 178 andholes 124 in theupper surface 126. In addition, front and rear flaps orskirts rear sides scalper blade 22 for engaging over front and rear side edges 206, 208 of theupper member 120. Theribs 186 andskirts lower members holes 124, and thereby protects the lockingmember 136 from being affected by contaminants. - The
scalper blade body 176 includes ametal plate 210 located within a lower,base portion 212 of thebody 176. The engagement pins 178 are attached to theplate 210, preferably by welding, and theplate 212 is molded within thebase portion 212 during formation of thescalper blade 22 to provide a firm attachment structure between the engagement pins 178 and the elastomeric material of theblade 22. - An
upper portion 214 of thescalper blade body 176 angles forwardly from thebase portion 212, and the front andrear sides blunt engagement edge 216. Thebase portion 212 is formed as a wide block-like structure, having the front andrear sides upper portion 214. In addition, therear side 204 of theupper portion 214 includes an indicia, such as arib 218, indicating a wear point on thescalper blade 22 when theblade 22 should be replaced. - In use, the
adjustment units blade support member 20 forward, and to tension thescalper blades 22 against theconveyor belt 16. A predetermined torque force applied to theblades 22 through thesupport member 20 may be provided through theresilient couplings 48 which will elastically deform as tension in applied through theinput shaft 40 to theoutput shaft 44. The resilient material of theblades 22 and the resilient material of thecouplings 48 provide two resilient structures for absorbing shock loads applied to theblades 22. - In addition, when it is desired to provide maintenance to the
blades 22, thepawl positioning lever 72 may be moved to the neutral position to permit free pivotal movement of thesupport member 20 away from theconveyor belt 16. It should also be noted that during maintenance involving release or locking of theblades 22 by the lockingmember 136, thepawls 62 may be located to a position engaging thegear 58 to limit thesupport assembly 20 to a stationary position and thereby facilitate application of a torque force for turning the lockingmember 136. - While the form of apparatus herein described constitutes a preferred embodiment of this invention, it is to be understood that the invention is not limited to this precise form of apparatus, and that changes may be made therein without departing from the scope of the invention which is defined in the appended claims.
Claims (5)
Priority Applications (1)
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US11/015,656 US7051862B1 (en) | 2004-12-17 | 2004-12-17 | Conveyor belt cleaner assembly including scalper blade |
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US11/015,656 US7051862B1 (en) | 2004-12-17 | 2004-12-17 | Conveyor belt cleaner assembly including scalper blade |
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US7051862B1 US7051862B1 (en) | 2006-05-30 |
US20060131136A1 true US20060131136A1 (en) | 2006-06-22 |
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US11/015,656 Active US7051862B1 (en) | 2004-12-17 | 2004-12-17 | Conveyor belt cleaner assembly including scalper blade |
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