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
  • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
  • B24B21/02—Machines or devices using grinding or polishing belts; Accessories therefor for grinding rotationally symmetrical surfaces
• • 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
  • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
  • B24B5/36—Single-purpose machines or devices
  • B24B5/363—Single-purpose machines or devices for grinding surfaces of revolution in situ

Definitions

• the invention relates to a device for grinding an outer surface of a rotationally symmetrical body, in particular for grinding a roller of a paper machine, with a along the.
• WO 98/03304 shows a belt grinding apparatus which has a support frame in which a belt grinding device is arranged.
• a belt grinding device To the side of the belt grinder, two rollers attached to the outer circumferential surface of the body to be machined are attached to the free end of the U-shaped support frame and rest on the surface of the roller. Another linkage with two rollers supported on rollers is provided on the side next to one of the two rollers. One of the two rollers runs on the surface of a roller spaced from the roller to be processed.
• a drive device is arranged on a side of the support frame facing away from the surfaces of the rollers, so that the belt grinding apparatus can be moved along the outer surface of the roller.
• the belt grinder is pressed onto the roller to be processed by means of an air pressure servo device, so that the servo device presses against the weight of the supporting frame.
• a disadvantage of such a device has been found that reliable grinding and machining of the outer surface of the roller is not guaranteed, since the contact pressure is limited due to the arrangement of the device on the roller, so that the belt sander is insufficiently applied to the outer surface of the roller can be pressed. Thus, only cleaning and polishing the outer surface of the roller is possible.
• the contact pressure generated by the servo device is insufficient, since the very low weight of the device is not sufficient for contour grinding.
• the device is not guided in the axial direction, so that the control of the device is imprecise and accordingly there is no support.
• the known device can only be used if an adjacent second roller is present, because this device requires a support roller which rests on an adjacent roller. Otherwise, the belt grinding apparatus would not be held on the outer contour of the roller, but would rather slide off.
• the laterally protruding scaffold structures which prevent the belt grinding apparatus from slipping in this way, require a great deal of space, so that it is necessary to ensure before grinding the roller that the grinding device can move freely along the outer contour of the roller. Under certain circumstances, this means that the rollers used in paper mills have to be removed or at least the surrounding area around the rollers has to be freed from any other components.
• the downtime of the rollers during processing must be kept as low as possible, because for economic reasons these paper machines have to produce paper around the clock.
• a stationary counter bearing is assigned to the outer jacket surface to be machined, that an adjusting device connected to the counter bearing and the supporting frame is inserted, which is supported on the counter bearing, and that the adjusting device acts on the outer jacket surface
• the contact pressure and / or the infeed of the belt grinder can be adjusted depending on the given unevenness of the outer surface and / or the measured eccentricity of the body or that a support member is attached to the support frame and that the support member is arranged with its free end at a distance from the body Counter bearing is movable.
• the support frame of the device is supported on a counter bearing, so that the infeed and contact pressure of the belt grinder can be applied in a defined manner, since the necessary force for Infeed of the belt sander is received by the counter bearing. This ensures that the grinding process can be carried out quickly and reliably, since the contact pressure and infeed of the belt grinder can be adjusted depending on the unevenness of the outer surface.
• the shafts in paper mills for deflecting and drying tiled material, on which the supporting frame is supported can be used as a counter bearing.
• Possible geometric deviations between the longitudinal axis of the shaft and the longitudinal axis of the rotationally symmetrical body can be compensated for in that the position of the support frame is correspondingly changed in relation to the outer lateral surface of the body by the adjusting device.
• the contact pressure required for grinding the roller is generated exclusively by means of the weight of the device, which is supported on the outer surface of the roller via the rollers.
• the evaluation and control unit is connected to the servo devices lifting or lifting the rollers such that the contact pressure of the belt grinder can be changed so that it lies between the value zero and approximately the weight of the device.
• the device is held on the outer circumferential surface of the roller, since the weight force axis of the device is aligned with the weight force axis of the roller and because the torque generated by the rotation of the roller and / or the belt grinder is supported on the counter bearing which is arranged at a distance from the body. Additional support devices are therefore not necessary.
• the drive of the roller can also be provided by the motor attached to the device, so that a very quick and uncomplicated operation of the device along the longitudinal axis of the body is ensured.
• the device is moved solely on the basis of the rotation of the body along the longitudinal direction of the body, namely if at least one roller is deflected obliquely with respect to the longitudinal axis.
• the drawing shows two exemplary embodiments according to the invention, which are explained in more detail below. In detail shows:
• Figure 1 shows a first embodiment of a device for grinding
• FIG. 1 in top view
• FIG. 3a shows a section of the device according to FIG. 1 in a lower infeed position
• FIG. 3b shows a section of the device according to FIG. 1 in an upper infeed position
• Figure 4 shows a second embodiment of a device for grinding
• Figure 5 shows a drive variant of the device according to Figure 4 in plan view.
• FIGS. 1 and 2 show a device 1 for grinding an outer surface 3 of a rotationally symmetrical body 2.
• the rotationally symmetrical body 2 is usually used in a paper machine and is designed as a roller. After a longer running time of the paper machine, it is necessary to grind the outer surface 3 of the body 2 in order to restore the concentricity of the body 2. Due to the long operating time of the paper machine and the permanent stress, 3 bumps are generated on the outer surface, which cause the surrounding paper to tear off. To machine the outer surface 3, it is necessary to set the body 2 in rotation, so that the device 1 can be moved in a longitudinal axis 4 of the body 2 along the outer surface 3.
• a feed motor 31 is attached to the device 1, which does not drive one illustrated toothed belt or the like is in a non-positive operative connection.
• the toothed belt is firmly clamped between the supports of the paper machine, which also support the roller.
• the device 1 consists of a support frame 11 on which a belt grinder 12 and a drive motor 13 which is operatively connected to the belt grinder 12 is held. Furthermore, three rollers 14 are articulated laterally on the support frame 11 on the end face thereof. The alignment of the rollers 14 is such that they are arranged in the circumferential direction of the body 2.
• the rollers 14 are rotatably mounted in a housing 16 which are articulated to the support frame 11 by means of guide rods 15.
• the freedom of movement of the rollers 14 in the vertical direction with respect to the outer surface 3 is adjustable by means of a servo device 27. Only the two middle guide rods 15 holding the rollers 14 are positioned in a fixed bearing in such a way that movement of the rollers 14 perpendicular to the outer surface 3, in particular in the direction of the support frame 11, is prevented.
• the belt grinder 12 comprises two deflection rollers, the distance between which can be variably adjusted so that the tension of the grinding belt can be adjusted.
• the deflection roller of the belt grinder 12 arranged in the support frame 11 bears against the outer lateral surface 3.
• the second deflection roller of the belt grinder 12 is held on the support frame 11 in such a way that the latter projects opposite in relation to the direction of rotation of the body 2.
• an adjusting device 22 is attached to the support frame 11 whose free end, that is to say the end of the adjusting device 22 facing away from the outer lateral surface, is assigned to a counter bearing 21.
• the counter bearing 21 is positioned stationary and is usually designed as a shaft. In normal operation of the paper machine, the shaft serves as a deflection for felt or similar carrier material that is needed to dry the paper. The shaft can also be installed.
• the adjusting device 22 comprises two struts 23 which carry a guide slide 29.
• Two rollers 28 are mounted in the guide carriage 29.
• the outer circumferential surfaces of the rollers 28 are concavely curved, so that the rollers 28 abut against differently large diameters of the counter bearings 21, since the contact points on the outer circumferential surface of the rollers 28 are determined by the diameter of the counter bearing 21.
• the adjusting device 22 is supported on the counter bearing 21 via the rollers 28.
• the distance between the counter bearing 21 and the outer surface 3 can be variable in the direction of the longitudinal axis 4, so that it is necessary to design the adjusting device 22 to be adjustable in height.
• the adjusting device 22 has the two struts 23, which are connected to one another like scissors at a pivot point 25.
• a spindle 26 is articulated on each strut 23, which interacts with the servo device 27.
• the spindle 26 is articulated on an intermediate member which is in a non-positive connection with the pivot point 25 of the struts 23.
• the intermediate member rotates in the direction of movement of the spindle 26, so that the respective strut 23 is moved in the vertical direction via the pivot point 25.
• the distance between the counter bearing 21 and the outer surface 3 can be compensated individually by the adjusting device 22.
• the contact pressure of the belt grinder 12 on the outer surface 3 can be adjusted via the force of the servo device 27, since the adjusting device 22 is attached directly to the belt grinder 12.
• FIGS. 3a and 3b show the maximum and minimum deflection positions of the adjusting device 22. Any positioning of the adjusting device 22 is steplessly possible between the two extreme positions.
• FIG. 2 shows in particular that two belt grinders 12 are attached to the support frame 11. The belt grinders 12 are arranged on the respective end face of the support frame 11, which lie in the direction of the longitudinal axis 4. The belt grinder 12 can thus also be moved in the respective outer regions of the body 2, so that the entire length of the body 2 can be machined.
• the rollers 14 are arranged downstream of the respective housing 16 with respect to the direction of rotation of the body 2, so that only tensile forces act on the rollers 14 due to the rotation of the body 2, so that the rollers 14 do not jam and no torques in the Housing must be included.
• the direction of rotation of the body 2 specifies the positioning of the rollers 14 in their housing 16.
• the device 1 is placed on the outer lateral surface 3 of the body 2 in such a way that the weight force axis 18 of the device 1 runs in alignment with the weight force axis 5 of the body 2.
• the device 1 can be placed on the body 2 at a deflection angle of 0 ° - this corresponds to the aligned arrangement - and a deflection of up to 20 ° from the vertical, in the direction of the counter-bearing 21 '.
• the rollers 14 accordingly support the device 1 laterally and are held movably on the support frame 11 perpendicular to the outer lateral surface 3.
• a support member 36 is pivotally and fixably articulated in a pivot bearing 39 on the support frame 11 of the device 1.
• the support member 36 has at its free end a roller 38 which on one Counter bearing 21 ', which is spaced from the body 2, abuts.
• the counter bearing 21 ' is usually another roller within the paper mill street.
• the positioning of the roller 38 on the counter bearing 21 ' is freely adjustable.
• the support member is formed from two telescopically displaceable tubes 37 which can be locked in any position relative to one another.
• the longitudinal axis of the support member 36 is perpendicular to the tangent extending at the point of contact of the roller 38 with the counter bearing 21 '.
• the roller 38 must not rest below a limit point, because then the support member 36 would slide off the counter bearing 21 '.
• the rollers 14 are arranged in their position on the outer contour 3 of the body in relation to the height level lower than the device 1, so that the rollers 1 provide support for the device 1 with regard to the torque generated by the body 2.
• a measuring device 41 is attached to the support frame 11 of the device 1, which lies on the outer surface 3 of the body 2 and detects the unevenness of the outer surface 3.
• the measuring device 41 can also be held on an external support frame and moved parallel to the device 41.
• the determined data of the measuring device 41 are forwarded to an evaluation and control unit 42, which is also attached to the support frame 11 of the device 1.
• the evaluation and control unit 42 is electrically connected to the servo devices 27 'acting on the individual rollers 14, so that the contact pressure of the belt grinder 12 on the outer surface 3 can be adjusted by means of the evaluation and control unit 42.
• the servo devices 27 press the rollers 14 onto the outer lateral surface 3, so that the belt grinder 12 is lifted off the outer lateral surface 3. If, on the other hand, the rollers 14 are lifted from the outer surface 3, the belt grinder 12 presses on the outer surface 3 with almost the entire weight of the device 1. Consequently, the contact pressure of the belt grinder 12 is between a value of zero and approximately the value of the weight of the device 1 Usually the grinding force to be applied is between zero and 600 Newtons. The weight of the device 1 is between 2100 and 2500 Newtons.
• the device 1 can be moved along the longitudinal axis 4 of the body 2. This is accomplished by driving the roller 38, which is supported on the counter bearing 21 '.
• a feed motor 31 ′ which is fastened to the support frame 11 and is drivingly connected to the roller 38 via a first cardan shaft 32 is provided.
• the feed motor 31 ' can also be operatively coupled to at least one of the rollers 14 via a second cardan shaft 32, so that the roller 14 is also driven. This leads to the fact that the body 2 is set in rotation via the roller 14. An additional drive of the device 1 or of the body 2 is therefore not necessary, because the movement of the device 1 and the rotation of the body 2 is accomplished directly via the feed motor 31 '.
• the drive of the device 1 in the direction of the longitudinal axis 4 has the following effect on the movement of the rollers 14, which are oriented perpendicular to the direction of movement of the device 1.
• the rollers 14 slide over the outer contour 3 of the body 2.
• the feed of the device 1 in the direction of the longitudinal axis 4 is very small - roughly comparable to the feed of a fine thread - the rollers 14 can easily slide onto the body 2 ,
• the evaluation and control unit 42 is electrically connected to the feed motor 31 'and controls it.
• the exactly necessary contact pressure can be generated and the device 1 can be moved in any direction along the longitudinal axis 4 of the body 2, so that the machining of the outer surface 3 in dependence on the measured unevenness in relation to the respective position of the device 1 on the body 2.
• the device 1 is moved in the direction of the longitudinal axis 4 of the body 2 due to the deflection of one of the rollers 14. This is done by rotating the body 2 in the direction of the arrow.
• a pivot 43 is provided, by means of which the roller 14 on the support frame 15 is articulated.
• a servo device 44 is attached between the support joint 43 and the support frame 15, by means of which the roller 14 can be pivoted from the vertical to the longitudinal axis 4.
• the deflection of the roller 14 in the direction of the servo 44 so that the device 1 moves due to the rotation of the body 2 clockwise in the direction of the arrow.
• the servo device 44 is pressed in the direction of the roller 14, the device 1 moves counter to the direction of the arrow shown.
• the diameter of the body 2 is usually 1,500 mm; the feed generated by the deflection of the roller 14 is approximately 50 mm, so that the undeflected rollers 14 slide over the outer contour 3 of the body 2. With such a low feed rate, the thread pitch is very low, so that the slipping of the individual rollers 14 has no impairment on the smooth running of the device 1.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
• Polishing Bodies And Polishing Tools (AREA)
• Grinding Of Cylindrical And Plane Surfaces (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7669519

Family Applications (1)

Country Status (7)

Cited By (2)

Families Citing this family (10)

Family Cites Families (7)

• 2000
  • 2000-12-23 DE DE10065881A patent/DE10065881A1/de not_active Withdrawn
• 2001
  • 2001-12-17 AT AT01985891T patent/ATE297833T1/de active
  • 2001-12-17 EP EP01985891A patent/EP1343612B1/fr not_active Expired - Lifetime
  • 2001-12-17 DE DE50106551T patent/DE50106551D1/de not_active Expired - Lifetime
  • 2001-12-17 US US10/250,630 patent/US6835122B2/en not_active Expired - Fee Related
  • 2001-12-17 WO PCT/EP2001/014883 patent/WO2002051585A2/fr not_active Application Discontinuation
  • 2001-12-17 ES ES01985891T patent/ES2243576T3/es not_active Expired - Lifetime
  • 2001-12-17 AU AU2002235784A patent/AU2002235784A1/en not_active Abandoned

Non-Patent Citations (1)

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