Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B27/00—Other grinding machines or devices
  • B24B27/0076—Other grinding machines or devices grinding machines comprising two or more grinding tools
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
  • B24B7/06—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor involving conveyor belts, a sequence of travelling work-tables or the like
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
  • B24B7/10—Single-purpose machines or devices
  • B24B7/12—Single-purpose machines or devices for grinding travelling elongated stock, e.g. strip-shaped work
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
  • B24B7/20—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground
  • B24B7/28—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding wood

Definitions

• the present invention concerns a grinding apparatus for processing a workpiece, including a support arrangement for a number of grinding heads that each includes a grinding element and a grinding motor driving an associated grinding element.
• grinding apparatuses with a number of rollers, either with surrounding sandpaper or with a number of grinding elements that are disposed in the longitudinal direction of the roller.
• the grin- ding apparatus is designed either with rollers typically rotating opposite each other, or rollers set at different angles in relation to the surface.
• the grinding apparatus will not be worn evenly along the roller, in particular if items with different dimensions are to be ground.
• the sandpaper will be worn most at the centre part of the roller.
• EP 0 471 641 are used a number of grinding arrangements where each grinding arrangement consists of a number of rotating rollers rotating about a vertical shaft. In order to ensure grinding of the entire item, these grinding arrangements are arranged with overlap, causing uneven grinding, since there are areas of the item which are ground more than once.
• This construction of a surface treatment apparatus entails non-uniform surface treatment, since the grinding areas of the two rows of grinding brushes overlap each other, whereby only one grinding of the surface of the item occurs. This means that the apparatus will not ensure an efficient grinding/deburring of edges and roundings of an item, as e.g. a stationary grinding drum may only grind the surface and forward facing edges/roundings, and a bar with overlapping grinding area of the grinding brushes only ensures a grinding of large parts of the surface once.
• the support arrangement includes an endless conveying means for the grinding heads, the conveyor means being moved in an annular course by at least one moving motor for establishing an epicyclic movement of the grinding elements across the work piece during operation.
• These grinding heads are connected with a support arrangement that holds the grin- ding heads at a desired position in relation to the surface of the item.
• these grinding elements are circular grinding wheels connected to the grinding motors so that they are disposed in the horizontal plane and preferably in parallel with the surface of the workpiece to be ground.
• the support arrangement includes a conveying means for the grinding heads, the conveying means being driven by the moving motors.
• the conveying means being driven by the moving motors. This entails that the individual grinding elements, besides that they may rotate about their own vertical shaft, may move horizontally transversely of the workpiece in a direction perpendicular to the vertical shaft of the grinding elements. This will ensure that the whole workpiece is ground in one run through the grinding apparatus, as the grinding elements perform an epicyclic movement across the workpiece.
• the conveying means is an endless course providing that the grinding heads are moved in an annular path around from one side to the opposite side and back again to the first side, so that the item is surface treated by two rows of grinding heads in one run through the apparatus.
• the grinding elements are connected to the grinding motors with a fixed shaft, whereby items with uniform thickness may be ground/sanded on the top side face, as the sandpaper on all grinding elements is parallel with the surface.
• the grinding elements are connected to the grinding motors with a movable shaft, e.g. a universal shaft or a shaft with a ball joint/bowl joint, whereby workpieces/items with non-uniform thickness may be ground on the top side face, since the sandpaper may now follow the contour of the surface of the item.
• a movable shaft e.g. a universal shaft or a shaft with a ball joint/bowl joint
• eacht grin- ding head includes a grinding element with associated grinding motor, whereby it is possible to have different direction of rotation for each single grinding element.
• every other grinding head may have the same direction of rotation of the grinding element, while the intermediate grinding heads have opposite direction of rotation, or every third grinding head may have the same direction of rotation of the grin- ding element, while the intermediate grinding heads have opposite directions of rotation.
• the different directions of rotation of subsequent grinding elements cause that the grinding apparatus advantageously may be used in deburring and grinding edges and roundings.
• the lateral movement of the grinding heads furthermore entails that an epicyclic movement is effected across the workpiece, providing a more efficient grinding of the edges and roundings of the item.
• the lateral movement of the grinding heads is to be adjusted to the speed with which the item is moved through the grinding apparatus, so that the grinding heads are moved at least so fast that the item is provided at least two grinding actions, and that there are no areas on the item which are not ground.
• the conveying means is constituted by a number of drive chains or belts which are adapted for engaging a drive wheel driven by the moving motors.
• four of these drive wheels are disposed rectangularly in the support frame, so that grinding heads connected to the conveying means are moved transversely of the item at first, and then back transversely of the item.
• the drive wheel will be sprocket wheels engaging the drive chain and thereby driving the conveying means with grinding heads.
• the drive wheels will either be smooth drive wheels which by means of the resisting force between N-belt and drive wheel will drive the conveying means with grinding heads around, or be a toothed drive wheel that engage a toothed side of the N-belt.
• the conveying means may be wires or wide bands or similar where the drive wheel is a narrow drive wheel or a roller, respectively.
• the drive wheels may be envisaged set up in other polygonal arrangements, as for example: three drive wheels disposed as a triangle, or - five drive wheels disposed as a pentagon.
• some of these drive wheels may be idlers which are only provided for guiding the conveying means.
• the conveying means is a wide toothed belt running on two large sprocket wheels disposed with one sprocket wheel at each side of the grinding apparatus.
• the grinding heads are disposed on the toothed belt.
• a grinding apparatus Since a grinding apparatus is to be used on items with different thickness or for items with varying thickness, it includes an apparatus frame in which the support arrangement is adjustable in height, arranged by means of a number of displacing force providers. As the support frame with grinding heads has a considerable weight, a number of displacing force providers are applied for elevating/lowering the support frame in the apparatus frame.
• the support frame may be disposed at a set level in the apparatus frame, whereby the grinding elements may be disposed so that they grind a precise thickness of the item.
• the displacing force providers may be cylinders, rack and pinion arrangements, mechanical rocker arrangements, rotational arrangements or similar, which may be driven hydrulically, pneumatically or electrically.
• the support frame can be adjusted in height makes it easy to bring the support frame up at a level which is readily accessible for replacing the grinding elements.
• the grinding elements may be constituted by: grinding discs that are mounted on a grinding wheel, e.g. by means of Velcro faces, or grinding wheels that are formed with a pin which is connected to the shaft of the grinding motors, e.g. by a screw socket.
• grinding elements may be readily replaced so that it is not required with long productions interruptions when grinding elements are to be changed.
• the grinding heads may have grinding elements with different members, as e.g. sandpaper, grinding brushes, wire brushes, polishing cloths or brushes.
• a grinding apparatus may find application in the wood industry, but may also find application with other industries where there are surfaces to be ground, e.g. in the automobile industry where sheet parts for vehicles are to be ground.
• Fig. 1 shows a perspective view of a grinding apparatus according to the invention
• Fig. 2 shows a sectional view of the grinding apparatus in Fig. 1
• Fig. 3 shows a side view of the grinding apparatus in Fig. 1
• Fig. 4 shows an additional side view of the grinding apparatus in Fig. 1
• Fig. 5 shows a grinding head
• Fig. 6 shows an alternative support frame
• Fig. 7 shows a set-up of a grinding apparatus.
• a grinding apparatus 1 that includes a number of grinding heads
• Each grinding head 6 is suspended in the support frame 4 along a conveying means 9 with a sheet part 14.
• Conveying means 9 is adapted for engaging drive wheels 11 that are driven by moving motors 5.
• the grinding apparatus 1 there are two drive wheels 11 and two idlers 10 disposed in a rectangle so that the grinding heads 6 are moved perpendicularly and transversely of the feeding direction A of a workpiece or item (not shown).
• Drive wheels 11 are disposed at opposite comers of the support frame 4.
• the conveying means 9 is shown as two chains engaging an upper and a lower set of drive wheels 11a, l lb/idlers 10a, 10b, respectively, which are shown as sprocket wheels.
• the apparatus frame 7 is provided with a wire/a belt 13 that prevents the grinding heads 6 from lateral deflections.
• the support frame 4 is connected with the apparatus frame 7 via drive wheels 11/idlers 10 and frame part 15, and is adjustable in height by means of cylinder 12.
• Fig. 5 shows a grinding head 6 including a grinding element 2 which is drivingly con- nected to a grinding motor 3 and suspended in a plate element 21 which constitutes the connection between the grinding head 6 and the support frame (not shown).
• Fig. 6 shows an alternative support frame 4 on which a number of grinding heads 6 are arranged on a continuous conveying means 9, shown here as a broad toothed belt.
• the continuous conveying means 9 is drivingly connected with a moving motor 5 so that the grinding heads 6 may be moved around on the support frame 4, simultaneously with the grinding elements 2 being rotated by means of the grinding motors 3, whereby an epicyclic movement of the individual grinding elements 2 is established.
• Fig. 7 shows a set-up of two grinding apparatuses 22, 23 in apparatus frame 7, where a first grinding apparatus 22 is arranged so that the grinding elements 2 are in contact with a surface of an item 20 which is moved across a roller table 24.
• a second grinding apparatus 23 is so arranged in the apparatus frame that the grinding elements 2 are in contact with an underside of the item 20 while it is moved from roller table 24 to roller table 25.
• Both grinding apparatuses 22, 23 are arranged adjustable in height in the apparatus frame 7 by means of cylinders 12.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Wood Science & Technology (AREA)
• Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
• Grinding Of Cylindrical And Plane Surfaces (AREA)
• Polishing Bodies And Polishing Tools (AREA)
• Crushing And Grinding (AREA)
• Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
• Mechanical Treatment Of Semiconductor (AREA)
• Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
• Disintegrating Or Milling (AREA)
• Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)

Priority Applications (8)

Applications Claiming Priority (2)

Publications (1)

Family

ID=34673549

Family Applications (1)

Country Status (12)

Cited By (7)

Families Citing this family (10)

Citations (5)

Family Cites Families (11)

• 2003
  • 2003-12-10 DK DK200301826A patent/DK200301826A/da not_active Application Discontinuation
• 2004
  • 2004-12-09 EP EP04801175A patent/EP1708850B1/en active Active
  • 2004-12-09 WO PCT/DK2004/000851 patent/WO2005056234A1/en active Application Filing
  • 2004-12-09 DE DE602004020267T patent/DE602004020267D1/de active Active
  • 2004-12-09 US US10/581,958 patent/US20070099546A1/en not_active Abandoned
  • 2004-12-09 ES ES04801175T patent/ES2326892T3/es active Active
  • 2004-12-09 CA CA002548245A patent/CA2548245A1/en not_active Abandoned
  • 2004-12-09 AT AT04801175T patent/ATE426485T1/de not_active IP Right Cessation
  • 2004-12-09 PL PL04801175T patent/PL1708850T3/pl unknown
  • 2004-12-09 RU RU2006124354/02A patent/RU2360780C2/ru not_active IP Right Cessation
  • 2004-12-09 DK DK04801175T patent/DK1708850T3/da active
  • 2004-12-09 BR BRPI0417483-6A patent/BRPI0417483A/pt not_active IP Right Cessation
• 2006
  • 2006-07-04 NO NO20063094A patent/NO327527B1/no not_active IP Right Cessation

Patent Citations (5)

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