Classifications

• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
  • E01B31/00—Working rails, sleepers, baseplates, or the like, in or on the line; Machines, tools, or auxiliary devices specially designed therefor
  • E01B31/02—Working rail or other metal track components on the spot
  • E01B31/12—Removing metal from rails, rail joints, or baseplates, e.g. for deburring welds, reconditioning worn rails
  • E01B31/17—Removing metal from rails, rail joints, or baseplates, e.g. for deburring welds, reconditioning worn rails by grinding
• • 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
  • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
  • B24B19/004—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding rails, T, I, H or other similar profiles
• • 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
  • B24B27/0007—Movable machines
• • 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

Definitions

• the present invention relates to a tangential grinding machine.
• Tangential grinding machines for regenerating the worn profile of rails on site, comprising a grinding device consisting essentially of a grinding wheel of abrasive material which when rotated removes by abrasion a part of the material with which it comes into contact.
• each grinding device consists generally of a d isc of abrasive material , or grind ing wheel , designed to operate with its circumferential edge.
• a further drawback of a tangential grinding wheel is the fact that to re- profile a ra il an apparatus with a negative contou r is requ ired , such an apparatus being of high cost.
• the final rail therefore presents a polygonal profile instead of the orig inal rad iused profile, with the cusps being flattened out and the profile being rounded by the subsequent passage of the train wheels, causing a continuous mechanical and metallurgic shock on the rail surface.
• those cup wheels which operate on the rail lateral surface are hindered by the presence of natural obstacles such as points, guide and containing blades at the points and , in the particular case of tram-rails, the cement and asphalt plus the actual rail counterblade.
• a further drawback is that cup grinding wheels generally have to work on both rails simultaneously for mass balancing reasons. This makes it more difficult to carry out grinding work on a single rail, such as the central earth rail or the outer lateral live rail for subway trains.
• Figure 1 is a perspective view of the base structure, the first frame and the second frame of the grinding machine according to the invention;
• Figure 2 shows it in the same view as Figure 1 but with the add ition of the support plate, and;
• FIG. 3 shows it with the grinding unit mounted.
• th e mach in e comprises substantially a base structure 2 mounted on four wheels 4 with their rim 6 slidable on the rails 8 to be ground.
• the frame 1 8 can be moved horizontally by cylinder-piston units 22 which urge said frame outwards until abutment means 24, rigid with it, come into contact with the head 26 of the rail 8.
• the vertical and horizontal sections of the frame 1 8 are connected together by a curved portion 28 comprising a plurality of holes 30.
• a plate 46 is appl ied in a positionable manner to the annular portion 38, and locked to said portion by stops 48.
• Said plate 46 supports a motor 50 which operates an abrasive grinding wheel by means of a pulley 52.
• the machine of the invention is firstly transferred to the site on which that section of rail to be ground is located, after which the procedure is as follows:
• the frame 32 is adjusted with respect to the curved portion 28 such as to slightly incl ine the axis of the grinding wheel 54 to the longitudinal axis of the rail 8 (inclination variation),
• the plate 46 is adjusted relative to the annular portion 38 such as to vary the angle which the axis of the grinding wheel 54 makes to the axis of the rail (convergence variation),
• the cyl inder-piston u n its 44 or red u cers 45 are operated to bri ng the grinding wheel 54 into contact with the rail, and the cylinder-piston units 22 are operated such that the sensors 24 lie in contact with the rail head,
• the motor 50 is operated to rotate the grinding wheel 54.
• the grind ing wheel implements its abrasive effect by virtue of the operating pressure on the cyl inder-piston u n its 44 , su itably regulated by pressure reducers, while wearing down in accordance with a certain profile having a rad ius independent of the worn contour of the rail by virtue of its particular disposition (inclination, convergence and translation relative to the rail). For each radius of the rail profile there corresponds a suitably positioned tangential grinding wheel .
• th e inclination of the second frame 32 to the curved portion 28 and/or the position of the plate 46 relative to the annular portion 38 have merely to be varied such as to vary the inclination or the convergence of the grinding wheel to the rail .
• the tangential grinding machine completely eliminates the negative contour which continuously reprofiles the grinding wheel by making the regeneration of the profile of the tangential grinding wheel take place by the abrasive wear due to the contact between the grinding wheel and rail (self-profiling).
• the rail becomes both a material to be ground and a negative contour, which continuously regenerates the profile of the tangential grind ing wheel , so also el im inating the entire wastage of abrasive material caused by traditional tangential systems.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Machines For Laying And Maintaining Railways (AREA)
• Cyclones (AREA)
• Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=44554220

Family Applications (1)

Country Status (5)

Cited By (5)

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Citations (6)

Family Cites Families (6)

• 2011
  • 2011-04-26 IT IT000025A patent/ITVE20110025A1/it unknown
• 2012
  • 2012-04-20 EP EP12717657.6A patent/EP2761089B1/en active Active
  • 2012-04-20 CN CN201280020220.XA patent/CN103518020B/zh active Active
  • 2012-04-20 ES ES12717657.6T patent/ES2561409T3/es active Active
  • 2012-04-20 WO PCT/EP2012/057287 patent/WO2012146540A1/en active Application Filing

Patent Citations (6)

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