Grinding roll for mineral material surfaces and a method for refurbishing a grinding roll

Abstract

The invention relates to a grinding roller for surfaces made of mineral materials, such as floors, bricks, or building blocks made of mineral materials. The roller comprises a rotating shaft and a sleeve applied around the shaft. The roller is provided with a plurality of abrasive segments applied to an external surface of the roller. The roller is characterized in that it comprises a set of plates, each having a cylindrical segment curvature. The plurality of segments is distributed over the external surface of the roller, which is formed by the external surfaces of the plate assembly. Each plate is detachably applied to the sleeve. The invention also relates to a grinding roller plate and a method for refurbishing a grinding roller by replacing a plate with worn segments with a functional plate.

Description

Scope of the invention

[0001] The present invention relates to the field of grinding surfaces of mineral material, such as floors, bricks or blocks of mineral material, in particular it relates to a grinding roller comprising a rotating shaft and a sleeve having a cylindrical external surface, the sleeve being applied around said shaft so as to be integral with the shaft, which roller is provided with a plurality of segments having abrasive material applied on an external surface of the roller. Introduction

[0002] Mechanical grinding tools, such as grinding rollers, are essential components in industry for machining the surface of various mineral materials, including soils, bricks, building blocks, and other similar objects. A grinding tool, such as a grinding roller, relies on the use of sleeves mounted around a rotating shaft, onto which segments containing abrasive material are brazed. These segments are crucial for ensuring optimal performance during the grinding process. However, the complexity involved in disassembling, debrazing, and repairing these sleeves when damaged presents a significant challenge for operators. These operations not only require specific technical skills but also result in high maintenance and repair costs for the grinding tool.In applications where precision is paramount, such as those requiring grinding to a tenth of a millimeter, vibrations caused by tool wear over time become a critical issue. These vibrations, often uncontrollable, introduce instabilities that compromise the quality of the grinding work. They result in a reduction in the accuracy and uniformity of the results, thus affecting the overall quality of the mechanical grinding process. The process of replacing segments with abrasive material must take into account their positioning on the sleeve, which adds further complexity to the replacement or repair of a grinding tool.

[0003] Despite previous advances, such as the "Segmental grinding wheel" disclosed by THE CARBORUNDUM COMPANY in 1934, the "Apparatus for grooving or grinding pavement" presented by ELECTROLUX PROFESSIONAL OUTDOOR PRODUCTS, INC. (HUSQVARNA) in 1990, the "Segmented rotor" of KOEHRING COMPANY in 1986 and the "Cutting heads" of GREENSIDE MACHINE COMPANY, LIMITED in 1986, replacing worn diamond segments remains a challenge in terms of efficiency and practicality for operators.

[0004] Prior art EP 3 951 065 B1 discloses an envelope for a soil treatment roller, specifically for use with a compaction or ground preparation machine. This tool is not intended for grinding surfaces made of mineral materials such as soil, bricks, or blocks, but rather for soil preparation operations intended for cultivation, where the precision requirements and technical challenges differ significantly from those of grinding mineral surfaces. In particular, EP 3 951 065 B1 does not disclose any overlap of abrasive material, either longitudinal or circumferential, and does not meet the surface regularity and vibration reduction requirements specific to grinding operations.

[0005] Prior art US2032362A from THE CARBORUNDUM COMPANY features a grinding wheel with segments equipped with abrasive material arranged for optimal straight-line wear, while prior art US5083839A from ELECTROLUX PROFESSIONAL OUTDOOR PRODUCTS, INC. introduces a rotating drum with segments arranged at angles that promote increased grinding efficiency. Similarly, prior art US4720207A from KOEHRING COMPANY offers a segmented rotor allowing for variable-width cuts without complex disassembly, and prior art US3647265A from GREENSIDE MACHINE COMPANY, LIMITED presents a solution for the economical repair of drum-type cutting heads, enhancing their maintenance and efficiency.

[0006] However, the complexity of repairing and unscrewing the diamond segments, depending on the number of interconnected sleeves, along with the vibrations observed in construction material grinding applications with these older tools, pose significant challenges for mechanical grinding operations. This situation represents a major obstacle for operators seeking to achieve high levels of precision and performance in their grinding applications. Uncontrolled vibrations caused by the improper positioning of the diamond segments compromise the quality of the grinding process.

[0007] The applicant therefore considered it useful to propose a grinding roller simplifying the assembly, disassembly, and replacement of segments fitted with abrasive material and aimed at improving the stability, precision and efficiency of the grinding tool. Solution to the invention

[0008] The invention relates to a surface grinding roller for mineral materials, in particular floors, bricks, or blocks made of mineral material, which roller comprises a rotating shaft and a sleeve having a cylindrical external surface, the sleeve being applied around said shaft so as to be integral with the shaft, which roller is provided with a plurality of segments having abrasive material applied to an external surface of the roller, said roller being characterized in that It comprises a set of plates, each plate having a cylindrical segment curvature and comprising a concave inner surface and an outer surface parallel to the inner surface, each plate being applied in a removable manner to the sleeve and such that the inner surface of each plate conforms to the outer surface of the sleeve, said plurality of segments is applied rigidly to the outer surface of the roller formed by the outer surfaces of the set of plates, said segments being substantially V-shaped and being positioned relative to each other with circumferential overlap such that the perimeter of any circumferential circle drawn on said outer surface of the roller intersects said abrasive material and with axial overlap such that any generatrix of said outer surface of the roller intersects said abrasive material,Each plate includes a peripheral edge defining teeth (133; 133') and openings (134; 134') arranged between the teeth, such that the teeth of one plate engage in the openings of adjacent plates, the openings (134, 134') and the teeth (133, 133') being positioned and dimensioned according to the shape and positioning of the segments, the segments of said plurality of segments placed at the periphery of the plates being at least partially applied to the teeth (133; 133') so as to respect said circumferential and axial overlaps. According to the invention, a "mineral material surface" is a surface whose composition is predominantly made up of mineral elements. For example, a concrete, natural stone, or terracotta surface is considered a mineral material surface. This definition can include composite materials provided that the exposed external part is predominantly made up of mineral elements.

[0009] One advantage of the grinding roller according to the invention is that it allows the worn segments with abrasive material to be replaced without damaging either the sleeve or the rotating shaft. In the roller according to the invention, each plate, having a cylindrical segment-shaped curvature, acts as an intermediary between the sleeve and the segments, unlike grinding rollers known in the prior art where the segments are directly brazed onto the sleeve or the rotating shaft. According to the invention, when segments of a plate are worn, it is sufficient either to replace the worn segments or to prepare a new plate to replace the plate with the worn segments. This offers numerous advantages, including, among others, not damaging the sleeve and thus reducing vibrations, and facilitating and accelerating assembly and disassembly.

[0010] The combination of removable plates, roughly V-shaped segments positioned with circumferential and axial overlaps, and the presence of openings and teeth along the peripheral edge of the plates, gives the grinding roller remarkable flexibility. This design allows for quick and easy replacement of segments with worn abrasive material, without damaging either the sleeve or the rotating shaft, while ensuring that the overlap between segments is maintained. The teeth and openings, positioned and sized according to the shape and positioning of the segments, effectively guarantee the overlap between the segments and ensure that the segments of the plurality of segments located around the periphery of the plates are fully pressed against them.Furthermore, the roller according to the invention guarantees precise and unambiguous relative angular and axial positioning between adjacent plates, reducing the risk of misalignment between the plates which could affect the accuracy of circumferential and axial overlaps.

[0011] Circumferential overlap, where the perimeter of any circumferential circle drawn on the outer surface of the roller intersects the abrasive material, and axial overlap, where any generatrix of the outer surface of the roller intersects the abrasive material, reduce dynamic vibrations during surfacing, maintain a constant contact surface with the workpiece, distribute roller wear more evenly, and minimize longitudinal abrasive discontinuities that cause striations or surface defects. Finally, the teeth and openings in the plates ensure that the overlap is maintained without further adjustment and regardless of dimensional variations in the sleeve or the forces generated by the grinding operations.

[0012] Thus, the applicant proposes a modular and robust grinding roller, which simplifies maintenance, improves the stability and precision of the grinding process, and extends the tool life while ensuring a quality finish. Rotating shaft and sleeve(s)

[0013] The rotating shaft is preferably made of steel and is dimensioned to withstand the mechanical stresses it experiences during roller operation. Advantageously, the rotating shaft comprises a cylindrical central section onto which the sleeve is fitted. Two cylindrical ends of the rotating shaft are arranged to be mechanically connected to a machine for holding the roller horizontally, at least one end of which is arranged to be connected to a power source for rotating the roller. Both ends may, for example, have a groove. In an advantageous embodiment, the diameter of the cylindrical central section of the rotating shaft is between 10 mm and 500 mm, preferably between 90 mm and 120 mm.

[0014] The sleeve is a hollow component that allows the roller to have a larger outer diameter than the diameter of the rotating shaft, while simultaneously limiting the roller's overall weight. Therefore, at least for reasons of weight and vibration reduction, it is not advisable to directly use a rotating shaft with a larger diameter onto which the pads would be mounted.

[0015] The sleeve is typically a tube, preferably made of steel, for example ST52-3 steel, characterized by a length, an outside diameter, and a thickness, these parameters being dimensioned to withstand the mechanical stresses that the sleeve undergoes during the operation of the roller. The roller may comprise several sleeves; the number of sleeves can be adapted according to the desired grinding roller and is not limited to a single sleeve. In an advantageous embodiment, the roller comprises two sleeves, each characterized by a length between 100 mm and 1000 mm, an outside diameter between 100 mm and 1000 mm, and a thickness between 10 mm and 50 mm.

[0016] The sleeve must be fitted around the rotating shaft so that it is securely attached. The shaft / sleeve assembly must allow for complete torque transmission during roller operation without damage. An improper assembly, meaning the shaft and sleeve are not fully secured, can lead to relative movement and vibrations between the sleeve and the shaft, ultimately damaging the assembly.

[0017] To ensure the sleeve and shaft are securely fastened, the roller preferably includes clamping rings to secure the sleeve against the shaft. If multiple sleeves are applied around the shaft, to ensure they are securely fastened, the sleeves can be joined by interlocking them using a male / female coupling and / or pins. The male / female coupling guides and correctly positions the sleeves on the same axis of rotation, one inside the other. The pins create the connection that transmits torque from one sleeve to the next.

[0018] To further improve the guidance and positioning of the sleeves, they can be joined by a tapered male / female coupling at an angle preferably between 1° and 7°, and even more preferably between 3° and 5°, ensuring precise alignment and good structural integrity. Furthermore, this provides a robust solution for replacing and installing the plates on the grinding roller when the sleeves need to be removed and reinstalled.

[0019] Alternatively, several sleeves can be joined by keys or any other coupling system known to a person skilled in the art.

[0020] In an advantageous embodiment, the roller comprises two sleeves. The first sleeve is applied around the shaft by means of two clamping rings, preferably at each end of the first sleeve. The second sleeve is fitted into one end of the first sleeve by means of a tapered male / female coupling and pins. The second sleeve is applied around the shaft by means of a third clamping ring at its other end. The sleeves include notches for receiving the pins to join the sleeves and to allow the transmission of torque from one sleeve to the other. In this case, the notches are positioned so that, when the sleeves are joined, the teeth of the plates on the end of the first sleeve engage with the openings of the adjacent plates on the second sleeve, and vice versa. Plates having a cylindrical segment curvature

[0021] The cylindrical curvature of each plate is essential because it is applied to the cylindrical sleeve, so that its inner surface conforms to the outer surface of the sleeve. The diameter of the inner surface of each plate is therefore logically approximately equivalent to the diameter of the outer surface of the sleeve. The radius of curvature of the inner surface of each plate is preferably between 50 mm and 500 mm, and even more preferably between 80 mm and 150 mm.

[0022] Furthermore, each plate can be characterized by a constant thickness corresponding to the distance between its outer and inner surfaces. This thickness must be sufficient to withstand the mechanical stresses experienced during the use of the grinding roller. Ideally, the thickness of each plate is between 0.5 mm and 50 mm, preferably between 4 mm and 13 mm, and even more preferably between 6 mm and 11 mm.

[0023] Each plate is preferably made of steel.

[0024] Each plate having a cylindrical segment curvature includes a peripheral edge that defines its overall shape. This peripheral edge can be straight, curved, or have any other geometry, depending on the needs of the invention, allowing each plate to adopt a configuration adapted to its use.

[0025] Advantageously, to allow for precise fitting between each plate, similar to a puzzle, the peripheral edge of each plate defines a rectangular shape with teeth and openings, preferably along its entire length, so that the teeth of one plate engage with openings in adjacent plates, and vice versa. This geometry facilitates the positioning of the plates relative to each other during assembly and, advantageously, positions the segments with abrasive material so that they overlap.

[0026] Each plate of the roller is preferably arranged to be in contact with four adjacent plates, particularly when the peripheral edge of each plate defines a substantially rectangular shape with teeth and openings along its entire length. However, for the plates located at the ends of the roller, each is generally in contact with only three other adjacent plates, the remaining side forming the end of the roller.

[0027] To allow each plate to be detachably applied to the sleeve, the plates and the sleeve preferably include holes aligned to provide passages through both the plates and the sleeve. Each hole is designed to receive a rod, optionally at least partially threaded, which clamps each plate against the sleeve. Each plate preferably includes four holes arranged to align with four corresponding holes on the sleeve.

[0028] Advantageously, the rod clamps each plate against the sleeve by means of a nut and optionally a washer, preferably from the inside, on the sleeve side, to prevent the orifice from being clogged by external dust. The surface receiving the nut or washer and / or the rod head is preferably flattened to ensure proper clamping on a flat surface. The rod head is preferably flattened and covers at least the orifice to prevent clogging. The orifices and the rod are preferably at least partially rectangular in cross-section to prevent the rod from spinning freely when the nut is tightened. The nut solution eliminates the need to tap the sleeve and plates. Indeed, it is simpler to replace the rod and nut if damaged than to repair the threads in the sleeve and / or each plate.

[0029] Alternatively, however, it is possible that the sleeve and / or each plate includes a thread in the openings and that the tightening is done by the threaded rod and this thread.

[0030] The roller can include several plates of different dimensions in order to modulate the useful length of the tool according to the need.

[0031] To facilitate and improve the precise positioning of segments on the surface formed by the external surfaces of the plate assembly, the surface formed by the external surfaces of the plate assembly may include markers such as marks, holes, grooves, notches, etc. Abrasive segments

[0032] The roller comprises a plurality of segments with abrasive material, substantially V-shaped, distributed and bonded to the outer surface of the roller, which is formed by the outer surfaces of all the plates. The abrasive material of each segment is arranged to contact the surface of the mineral material to be ground and can therefore be subjected to significant mechanical stresses. For greater hardness and less wear, the segments are preferably diamond segments. To ensure that the segments and each plate to which they are applied are and remain bonded, the segments are preferably bonded to the outer surface of the roller, formed by the outer surfaces of all the plates, by thermal joining, such as brazing and / or welding.

[0033] In order to ensure uniform rectification and to facilitate the application of the segments to the surface formed by the external surfaces of the set of plates, the segments preferably have a curvature substantially in the shape of a segment of a cylinder so as to conform to the shape of the surface formed by the external surfaces of the set of plates to which they are applied.

[0034] To ensure uniform coverage of the outer surface of each plate, the segments are substantially V-shaped. This V-shape can be achieved for a single segment or alternatively by juxtaposing several segments, for example, by juxtaposing several I-shaped segments so that they form a V. Furthermore, the segments are positioned relative to each other with a circumferential overlap such that the perimeter of any circumferential circle (c) drawn on said outer surface of the roller intersects said abrasive material, and with an axial overlap such that any generatrix (g) of said outer surface of the roller intersects said abrasive material.Preferably at least 20%, preferably at least 30%, preferably at least 40%, of the perimeter of any circumferential circle (c) drawn on said outer surface of the intersecting roller of said abrasive material, and preferably at least 20%, preferably at least 30%, preferably at least 40%, of any generatrix (g) of said outer surface of the intersecting roller of said abrasive material. For the purposes of the present invention, "perimeter of any circumferential circle" and "any generatrix" are understood to mean imaginary lines around the roller drawn respectively in a plane perpendicular to its axis for the circle and parallel to its axis for the generatrix, serving as a geometric reference for defining the position and overlap of the abrasive segments. These lines do not correspond to physical elements of the roller but to theoretical reference points.

[0035] In an advantageous embodiment, the segments are positioned in a staggered pattern to ensure homogeneous and continuous coverage of the sleeve. Ideally, to maximize the abrasive surface of the roller and make it as uniform as possible, the roller comprises several rows of V-shaped segments along its length, each spaced a distance d apart. Adjacent rows are preferably offset lengthwise, advantageously by a distance d / 2, so that the tip of a V-shaped segment engages between two segments of the adjacent row. Advantageously, when the peripheral edge of each plate defines a rectangular shape with teeth and openings to allow for precise alignment, the teeth and openings are sized according to the rows of segments and the offset between each row.

[0036] The invention also relates to a grinding roller plate according to the invention, the plate having a cylindrical segment curvature and comprising a concave inner surface and an outer surface parallel to the inner surface, the plate being applied in a detachable manner to a sleeve and such that the inner surface of the plate conforms to the outer surface of the sleeve, segments provided with abrasive material and substantially in the shape of "V" being applied securely to the outer surface of the plate and being positioned relative to each other with circumferential overlap such that the perimeter of any circumferential circle drawn on said outer surface of the roller intersects said abrasive material and with axial overlap such that any generatrix of said outer surface of the roller intersects said abrasive material,the plate comprising a peripheral edge defining teeth and openings arranged between the teeth so that the teeth of the plate engage in the openings of at least one adjacent plate, the openings and teeth being positioned and dimensioned according to the shape and positioning of the segments, the segments of said plurality of segments placed at the periphery of the plate are at least partially applied to the teeth so as to respect said circumferential and axial overlaps.

[0037] The invention also relates to a method of refurbishing a grinding roller according to the invention comprising a plate, with segments provided with worn abrasive material, mounted in a detachable manner on a sleeve, said sleeve being mounted on a rotating shaft, the method comprising the step of replacing the plate with worn segments with an operational plate.

[0038] Replacing a plate with worn segments with a functional one preferably involves preparing a new plate onto which new abrasive segments are applied, preferably by thermal bonding. Thermal bonding is preferably brazing and / or welding.

[0039] Alternatively, the replacement may consist of keeping the plate and replacing only the worn segments.

[0040] In the case of preparing a new plate and / or to facilitate the replacement of worn segments, the method may include a step of removing the plate with the worn segments. The method then also includes a step of mounting the plate.

[0041] The method may also include a step of removing the shaft sleeve if removing the plate with the worn segments requires access to the inside of the sleeve. For example, if the plate is clamped onto the sleeve by means of a nut and threaded rod, and the nut is inside the sleeve, then the method includes a step of removing the sleeve before removing the plate.

[0042] When the method includes the step of dismantling the sleeve, it also includes a step of mounting the sleeve onto the rotating shaft after mounting the operating plate onto the sleeve.

[0043] The invention also relates to a machine for grinding surfaces made of mineral material, in particular floors, bricks or building blocks made of mineral material, said machine being provided with a grinding roller according to the invention. Detailed description

[0044] The invention will now be explained in more detail, with the help of the attached drawings, on which: There figure 1 is an overview of a grinding roller according to an advantageous embodiment of the invention; The figure 2 is an exploded view of the grinding roller of the figure 1 ; There figure 3 is a longitudinal section of the grinding roller of the figure 1 ; There figure 4 is a longitudinal section of a female sleeve of the grinding roller of the figure 1 ; There figure 5 is a longitudinal section of a male sleeve of the grinding roller of the figure 1 ; There figure 6 is an overview of a grinding roller plate of the figure 1 ; There figure 7 is an overview of a plate, the grinding roller of the figure 1 , onto which segments equipped with abrasive material are applied; The figure 8is a cross-section of the grinding roller of the figure 1 ; There figure 9 is an enlargement of the figure 8 ; There Figure 10 is an exploded view of the grinding roller of the figure 1 ; There figure 11 is a diagram of a preferred method for reconditioning a grinding roller of the figure 1 .

[0045] THE figures 1,2 And 3The drawings illustrate a grinding roller 1 for surfaces made of mineral material, in particular soil, bricks, or blocks made of mineral material, according to an advantageous embodiment of the invention. The roller 1 comprises a rotating shaft 11 with a cylindrical central portion 111 onto which two sleeves 12 and 12' are fitted so as to be fixed to the shaft 11. Two ends 112 of the shaft 11 have a groove for mechanical connection to a machine and for maintaining the roller 1 horizontally. These grooves also allow at least one of the ends 112 to be connected to a power source (not shown in the drawings) to rotate the roller 1.

[0046] To secure the two sleeves 12;12' to the shaft 11, the roller 1 includes three clamping rings 15;15';15'' to clamp the sleeves 12;12' against the shaft 11, more specifically against the cylindrical portion 111. The sleeves 12;12' also each include a male or female end for interlocking with one another by male / female coupling. In particular, as illustrated in figures 4 And 5The sleeve 12 has a female end 121 and the sleeve 12' has a male end 121' so that the sleeve 12' fits into the sleeve 12. The sleeves 12 and 12' also have notches 122 and 122' for receiving pins (not shown) to join the sleeves 12 and 12' and to allow the transmission of torque from one sleeve 12 and 12' to another. To optimize the guidance and positioning of the sleeves 12 and 12', the male ends 121' and female ends 121 are preferably tapered at an angle between 1° and 7° with the axis of rotation. More specifically, the sleeve 12 is applied around the shaft 11 by means of the clamping rings 15;15' while the sleeve 12' is fitted into the sleeve 12 and is applied against the shaft 11 by means of the clamping ring 15". Holes 123 are provided in each sleeve to receive threaded rods.

[0047] The illustrated scroll figures 1,2 And 3also includes a set of plates 13, each of which is detachably applied to the sleeves 12; 12' such that the inner surface 131 of each plate 13 conforms to the outer surface of the sleeves 12; 12'. Each plate 13, as illustrated in the figure 6The plate 13 has a cylindrical segment curvature and comprises a concave inner surface 131 and an outer surface 132 parallel to the inner surface 131. Each plate 13 includes a peripheral edge defining openings 134; 134' and polygonal teeth 133; 133'. Specifically, rectangular teeth 133' and trapezoidal teeth 133 are used so that the teeth 133; 133' of one plate engage with the openings 134; 134' of adjacent plates and vice versa. The teeth 133, 133' are positioned and sized according to the shape and positioning of the segments coated with abrasive material. The rectangular teeth 133' are preferably applied to the transverse edges and the trapezoidal teeth 133 to the longitudinal edges of the plate. Each plate also includes four holes 135, each designed to receive a threaded rod. Flat surfaces 136 at the bottom of the orifice are provided to accommodate the heads of the threaded rods.

[0048] The roller 1 also comprises a plurality of segments provided with abrasive material 14 and substantially V-shaped, distributed and applied by thermal bonding over a surface formed by the external surfaces 132 of all the plates 13 so as to be integral with each plate 13 to which they are applied. Each abrasive segment 14 has a curvature substantially in the shape of a cylindrical segment to better conform to the external surface 132 of the plate 13. Furthermore, as illustrated in the figure 1 , the segments 14 are positioned relative to each other with circumferential overlap such that at least 20% of the perimeter of any circumferential circle (c) drawn on said external surface of the roller intersects said abrasive material and with axial overlap such that at least 20% of any generatrix (g) of said external surface of the roller intersects said abrasive material.

[0049] For the largest and most homogeneous abrasive surface possible, as illustrated in the figure 7 For a plate, the roller comprises along its length several rows 141 of V-shaped segments 14. The segments are placed at a distance 'd' from each other, with adjacent rows offset along their length by a distance d / 2 such that the tip 142 of a V-shaped segment engages in the space 143 between two segments of the adjacent row. The teeth 133; 133' and the openings 134; 134' formed by the peripheral edge of each plate are dimensioned taking into account the shape of the segments 114 and their arrangement. When the plates 13 are arranged end to end on the sleeves 12; 12', the grinding roller 1 has several rows of segments 14 along its entire periphery, as shown in the figure 1 .

[0050] With reference to figures 8 , 9 and 10In order for the assembly of plates 13 to be applied in a removable manner to the sleeves 12;12', the four holes 135 are arranged to be aligned with four holes in a sleeve 12;12' so as to obtain continuous holes 116 through the plates 13 and the sleeves 12;12'. Each hole 16 thus obtained is arranged to receive a threaded rod 161 and to clamp each plate 13 against a sleeve 12;12'. The head 1611 of the rod 161 rests on a flattened surface 136 of the plate 13, while its end 1612 protrudes from the side of the sleeve 12;12' to accommodate a nut (not shown). The nut is engaged on the protruding end 1612 of the rod 161 and rests on a flattened surface 124;124' of the sleeve so as to clamp the plate against the sleeve.

[0051] With reference to the figure 11 , a preferred method for restoring a grinding roller as described in figures 1 to 10comprising a plate, with segments fitted with worn abrasive material, mounted in a removable manner on a sleeve, said sleeve being mounted on a rotating shaft.

[0052] The method preferably includes a first step A of dismantling the sleeve. This step is necessary to remove the plate if the nut is tightened from inside the sleeve. This step can be omitted if the original plate is retained. To remove the sleeve from the roller according to the figures 1 to 10 The clamping rings must be loosened and the two sleeves uncoupled to retrieve the sleeve in question.

[0053] The next step, B, preferably involves removing the plate from the sleeve. This is done by unscrewing the nuts on the threaded rods inside the sleeve. The plate can then be separated and removed from the sleeve. This step can be omitted if the segments are replaced directly.

[0054] The method includes the essential step C of replacing the plate with worn segments with a functional plate. Preferably, the plate is a new, functional plate with new segments. Alternatively, it is possible to keep the original plate and replace the worn segments to obtain a functional plate again.

[0055] After replacing the plate, the plate is mounted onto the sleeve by screwing the nuts onto the threaded rod from inside the sleeve. This step is omitted if the plate was not removed and the segments were replaced directly.

[0056] Finally, the sleeve is mounted E onto the rotating shaft and the grinding roller is operational again. Mounting the sleeve, in this case, consists of coupling and tightening the sleeves using the clamping rings.

Claims

1. Grinding roller (1) for surfaces made of mineral material, in particular soils, bricks or building blocks made of mineral material, which roller comprises a rotating shaft (11) and a sleeve (12; 12') having a cylindrical external surface, the sleeve being applied around said shaft so as to be integral with the shaft, which roller is provided with a plurality of segments (14) having abrasive material applied to an external surface of the roller, said roller being characterized in that- it comprises a set of plates (13), each plate having a cylindrical segment curvature and comprising a concave inner surface (131) and an outer surface (132) parallel to the inner surface, each plate being detachably applied to the sleeve such that the inner surface of each plate conforms to the outer surface of the sleeve, - said plurality of segments is rigidly applied to the outer surface of the roller formed by the outer surfaces of the set of plates, said segments being substantially V-shaped and positioned relative to each other with circumferential overlap such that the perimeter of any circumferential circle (c) drawn on said outer surface of the roller intersects said abrasive material and with axial overlap such that any generatrix (g) of said outer surface of the roller intersects said abrasive material,- each plate includes a peripheral edge defining teeth (133; 133') and openings (134; 134') arranged between the teeth, such that the teeth of one plate engage in the openings of adjacent plates, the openings (134, 134') and the teeth (133, 133') being positioned and dimensioned according to the shape and positioning of the segments, the segments of said plurality of segments placed at the periphery of the plates are at least partially applied to the teeth (133; 133') so as to respect said circumferential and axial overlaps.

2. Grinding roller according to claim 1, wherein at least 20% of the perimeter of any circumferential circle (c) drawn on said outer surface of the roller intersects said abrasive material, and at least 20% of any generatrix (g) of said outer surface of the roller intersects said abrasive material.

3. Grinding roller according to claim 1 or 2, said roller comprising at least two sleeves (12;12').

4. Grinding roller according to claim 3, in which the sleeves are coupled to each other by conical male / female coupling (121;121') at an angle between 1° and 7°, more preferably between 3° and 5°.

5. Grinding roller according to any one of the preceding claims, wherein the segments are diamond segments.

6. Grinding roller according to any one of the preceding claims, wherein the segments are applied by thermal assembly to the surface formed by the external surfaces of the set of plates.

7. Grinding roller according to any one of the preceding claims, wherein the segments have a curvature substantially in the shape of a cylinder segment so as to conform to the shape of the external surface of the plate on which they are applied.

8. Grinding roller according to any one of the preceding claims, wherein the plates and the sleeve on which they are applied in a detachable manner comprise orifices (123; 135) aligned so as to obtain continuous orifices (16) through the plates and the sleeve, each orifice being arranged to receive a rod (161), optionally at least partially threaded, clamping each plate against the sleeve.

9. Grinding roller according to claim 8, in which each plate comprises four orifices (135) arranged to align with four corresponding orifices (123) on the sleeve.

10. Grinding roller according to claim 8 or 9, wherein the rod clamps each plate against the sleeve by means of a nut and optionally a washer, from the inside, on the sleeve side.

11. Plate (13) of a grinding roller according to the preceding claims, the plate having a cylindrical segment curvature and comprising a concave inner surface (131) and an outer surface (132) parallel to the inner surface, the plate being arranged to be detachably applied to a sleeve and such that the surface conforms to the outer surface of the sleeve, substantially V-shaped abrasive segments (14) being rigidly applied to the outer surface of the plate and being positioned relative to each other in a circumferential overlap such that the perimeter of any circumferential circle drawn on said outer surface of the roller intersects said abrasive material and in an axial overlap such that any generatrix of said outer surface of the roller intersects said abrasive material,the plate comprising a peripheral edge defining teeth and openings arranged between the teeth so that the teeth of the plate engage in the openings of at least one adjacent plate, the openings and teeth being positioned and dimensioned according to the shape and positioning of the segments, the segments of said plurality of segments placed at the periphery of the plate are at least partially applied to the teeth so as to respect said circumferential and axial overlaps.

12. Method of reconditioning a grinding roller according to the preceding claims comprising a plate, with substantially "V"-shaped segments and provided with worn abrasive material, mounted in a detachable manner on a sleeve, said sleeve being mounted on a rotating shaft, the method comprising the step of replacing (C) the plate with worn segments with an operational plate.

13. Method of reconditioning a grinding roller according to claim 12, comprising a step of dismantling (B) the plate with the worn segments before replacement with an operational plate and comprising a step of mounting (D) the operational plate after replacement (C).

14. Method of reconditioning a grinding roller according to claim 13, comprising a dismantling step (A) of the sleeve of the rotating shaft when dismantling the plate with the worn segments requires access to the inside of the sleeve and comprising an assembly (E) of the sleeve.

15. Machine for grinding surfaces of mineral material, in particular floors, bricks or building blocks of mineral material, said machine being provided with a grinding roller according to any one of claims 1 to 10.

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