US20130130603A1 - Automatically adjustable protection device for a grinding wheel - Google Patents
Automatically adjustable protection device for a grinding wheel Download PDFInfo
- Publication number
- US20130130603A1 US20130130603A1 US13/810,449 US201113810449A US2013130603A1 US 20130130603 A1 US20130130603 A1 US 20130130603A1 US 201113810449 A US201113810449 A US 201113810449A US 2013130603 A1 US2013130603 A1 US 2013130603A1
- Authority
- US
- United States
- Prior art keywords
- grinding wheel
- protection device
- fixed portion
- respect
- containment structure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 230000004224 protection Effects 0.000 title claims abstract description 30
- 230000000903 blocking effect Effects 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims description 2
- 229910003460 diamond Inorganic materials 0.000 claims description 2
- 239000010432 diamond Substances 0.000 claims description 2
- 238000007790 scraping Methods 0.000 claims description 2
- 239000003082 abrasive agent Substances 0.000 description 11
- 238000006467 substitution reaction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 239000012809 cooling fluid Substances 0.000 description 2
- 239000000110 cooling liquid Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Images
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
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/04—Protective covers for the grinding wheel
-
- 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
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
-
- 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
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/04—Protective covers for the grinding wheel
- B24B55/045—Protective covers for the grinding wheel with cooling means incorporated
Definitions
- the present invention relates to a protection device for a grinding wheel, particularly but not exclusively for a rotating grinding wheel made of an abrasive material.
- the invention can in fact also be applied to other types of grinding wheels, for example also to so-called “CBNs” which have an extremely limited consumption.
- Grinding wheels are employed in the field of grinding, for example of laminator cylinders, paper-mill cylinders, and others. Examples are rotating grinding wheels made of abrasive material, which act on cylinders or similar pieces being processed.
- the grinding wheels are rotated inside protections or shelters.
- the shelters of these grinding wheels must be designed and constructed for containing, under safety conditions, any possible fragments that can be released during the processing, also in the case of breakage or explosion of the grinding wheel during its rotation and of the engagement on the cylinder being processed.
- these grinding wheels are currently enclosed in their own shelter, which generally consists of a fixed part (so-called hood), and a movable part (so-called tile) in addition obviously to a covering and movable protection device to have access to the hood for the substitution of the grinding wheel; in particular, these covers can be fixed to the hood by means of hinges and can be opened by rotating them; or by means of guiding devices in which case they can be made to slide manually or with a motor.
- the tile can be regulated with respect to the hood in order to limit the peripheral portion of non-protected grinding wheel to the maximum, with a variation in the diameter of the grinding wheel itself
- the operator does not know the wear of the grinding wheel moment by moment and in order to satisfy the safety requirement described above, he should verify, after each grinding cycle of the machine, the distance between tile and grinding wheel and consequently intervene to re-establish the safety distance by maneuvering screw controls and/or knobs which allow the tile to be regulated with respect to the grinding wheel.
- the cooling fluid necessary for the grinding process causes jets which could, with time, endanger the health of the operator if they regularly reach the latter. It is consequently necessary to minimize the exposed surface of the grinding wheel, also on the side where there is access for substitution, in order to avoid jets and the accidental leakage of the cooling fluid as much as possible.
- a general objective of the present invention is to solve the drawbacks cited above of the known art in an extremely simple, economical and particularly functional manner.
- a further objective of the present invention is to provide a protection device for a grinding wheel, particularly but not exclusively a rotating grinding wheel made of abrasive material, which can be automatically regulated, without the necessity of complex measurements entrusted to the expertise of the operator for maintaining the correct distance between grinding wheel and outer covering element (tile) and, above all, without the direct intervention of the operator in a difficult, tiring and dangerous operation.
- Another objective of the present invention is to provide a protection device, for example, for a rotating grinding wheel made of abrasive material, which prevents a significant leakage of cooling liquid in the processing phase, in every configuration of the protection device and for each diameter of the grinding wheel.
- a protection device has been conceived, particularly but not exclusively for a rotating grinding wheel made of abrasive material, having the characteristics specified in the enclosed claims.
- FIG. 1 is a schematic side view of a protection device for a rotating grinding wheel made of abrasive material produced according to the invention in a closed position;
- FIG. 2 is a schematic view such as that of FIG. 1 in which some of the parts have been sectioned to allow a better understanding of the invention
- FIG. 3 is a schematic view such as that of FIG. 2 in which some of the parts have been sectioned to allow a better understanding of the invention and which shows the configuration convenient for the insertion of a new grinding wheel;
- FIG. 4 is a schematic side view of the protection device as shown in FIG. 3 ;
- FIGS. 5 a , 5 b and 5 c are a further view such as that of FIG. 1 from above and an enlarged detail which shows the grinding wheel in contact with the sensor for revealing the actual diameter of the grinding wheel before the facing and grooving cycle;
- FIGS. 6 a , 6 b and 6 c show views similar to those of FIGS. 5 a , 5 b and 5 c when the grinding wheel is in contact with the diamond during the so-called “diamonding” or facing and grooving phase;
- FIGS. 7 a , 7 b and 7 c show views similar to those of FIGS. 5 a , 5 b and 5 c which represent the phase in which the correct distance between the fixed part and movable part of the protection device is re-established to ensure the safety requirements described above.
- these illustrate a protection device for a rotating grinding wheel made of abrasive material produced according to the invention.
- the protection device comprises a containment structure comprising a fixed portion 11 with respect to the rotation axis of the grinding wheel assembled on the grinding machine and a movable portion 12 .
- the movable portion 12 is assembled on a pair of scraping guides 13 , having a low friction coefficient, positioned on opposite sides with respect to the grinding wheel.
- the fixed portion 11 comprises, constrained to it for example by means of hinges 14 , a covering and protection element 15 of the containment structure of a grinding wheel 16 .
- a motor or driving device for example a pneumatic cylinder 17 , and a stem 18 with which, at its free end, it is hinged to the movable portion 12 , is constrained to the fixed portion 11 of the containment structure.
- An electromagnetic blocking unit 19 of the movable part 12 with respect to the fixed part 11 is alsoprovided.
- a blocking element 20 acts as a safety device for the movement of the movable portion 12 with respect to the fixed portion 11 .
- This element can, for example, be a stem-block, which comprises a suitable valve which, when fed with pressurized air, prevents the cylinder from effecting movements due, for example, to the residual compressed air inside the cylinder.
- the motor 17 is also equipped with a sensor 26 suitable for automatically identifying the position of the movable portion 12 corresponding to a new grinding wheel.
- a nozzle 23 for the emission of cooling and lubricating liquid between the grinding wheel 16 and piece under processing.
- a sensor 25 for revealing the diameter of the grinding wheel before the diamonding a “diamonding” or facing and grooving unit 29 and, finally, a mechanical buffer 24 on which the movable part 12 rests during the automatic positioning cycle of the movable part 12 with respect to the fixed part 11 .
- These elements 25 , 24 and 29 are in front of the movable portion 12 and near the operating opening 22 when the grinding wheel-holder trolley positions the grinding wheel itself in correspondence with the piece-holder head.
- the grinding wheel-holder trolley is brought to a “grinding wheel substitution” position, the advance axis X of the grinding wheel is then withdrawn completely, the electromagnetic brake 19 is unblocked, the cylinder 17 is activated by means of the control unit 27 to move the movable portion 12 away from the fixed portion 11 to allow the grinding wheel 16 to be inserted. In this phase the cylinder goes to the run-end. All the above operations, except for the opening of the covering element 15 , can be effected sequentially or automatically, once the specific grinding wheel substitution procedure has been activated on the control unit 27 .
- the covering element 15 is closed and firmly fixed by means of the knobs 21 or another equivalent blocking device.
- the movable portion 12 is brought back onto the fixed portion 11 until the sensor 26 identifies the correct starting operative position on the basis of the maximum value of the diameter of the grinding wheel 16 used.
- the cylinder 17 is then stopped and the electromagnetic blockage unit 19 is activated ( FIG. 1 ).
- the operating cycle initiates with the intervention of the grinding wheel 16 for example on a cylinder to be ground (not shown).
- the diameter of the grinding wheel 16 is controlled by control means of the whole grinding machine consisting of a CNC system, schematized in 27 , and when there is a wear of 2-3 mm, a warning/alarm is visualized on a display 28 asking the operator to effect a procedure for reestablishing the safety distance between the movable portion 12 and the fixed portion 11 as soon as possible, i.e. at the end of the grinding cycle underway.
- the regulation of the movable part 12 with respect to the fixed part 11 can, for example, be effected by means of an automatic cycle managed by the control system 27 after requesting the operator, and is composed of the following phases:
- the grinding machine positions the grinding wheel-holder trolley so that the grinding wheel is in correspondence with the sensor 25 situated onboard the piece-holder head.
- the advancement axis X of the grinding wheel moves the grinding wheel itself towards the sensor.
- the control system 27 on the basis of the position of the advancement axis X of the grinding wheel and original diameter of the new grinding wheel, calculates the present diameter.
- the grinding wheel-holder trolley is positioned so that the grinding wheel is in correspondence with the facing and grooving unit 29 situated onboard the piece-holder head and the facing and grooving is effected automatically.
- the control system 27 automatically calculates the decrease in the diameter of the grinding wheel in relation to the increase in the advance axis X of the grinding wheel. c) Finally, the grinding wheel is positioned so as to put the movable part 12 in correspondence with the reference 24 situated onboard the piece-holder head until it touches it. The brake 19 is unblocked and the advance axis X of the grinding wheel advances until the movable part 12 touches the reference 24 .
- the control system 27 activates the advance axis X of the grinding wheel which “pushes” the movable part 12 which, as it is not braked and the piston 17 is not charged, moves towards the fixed part 11 positioning the movable part 12 at the desired distance from the grinding wheel.
- the run of the advance axis X of the grinding wheel necessary for effecting this operation is calculated automatically by the control system 27 .
- the magnetic blocking unit 19 is activated.
- the operating cycle initiates with the intervention of the grinding wheel 16 . It can therefore be understood how the correct position of the protection device is imparted giving the operator more protection in the case of explosion of the grinding wheel and preventing the operator from having any contact with fragments made of abrasive material.
- the safety of always operating at the correct distance between the grinding wheel 16 and containment structure 11 , 12 provides greater control on the emission of the cooling liquid onto the grinding wheel 16 and onto the piece, minimizing the jets outside the machine and preventing damages to the operator's health.
- the invention can be indifferently applied to hoods with both a sliding and rotating cover.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
- Braking Arrangements (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
Abstract
A protection device for a grinding wheel includes a containment structure having an operating opening for a grinding wheel, wherein the containment structure includes a fixed portion and a movable portion which can be moved with respect to the fixed portion by means of a motor and which can be blocked with respect to the first fixed portion by means of a magnetic blocking unit. The device further includes a sensor adapted to automatically detect the position of the movable portion, and a control means of the entire device.
Description
- The present invention relates to a protection device for a grinding wheel, particularly but not exclusively for a rotating grinding wheel made of an abrasive material.
- The invention can in fact also be applied to other types of grinding wheels, for example also to so-called “CBNs” which have an extremely limited consumption.
- Grinding wheels are employed in the field of grinding, for example of laminator cylinders, paper-mill cylinders, and others. Examples are rotating grinding wheels made of abrasive material, which act on cylinders or similar pieces being processed.
- In related machine tools, the grinding wheels are rotated inside protections or shelters. The shelters of these grinding wheels must be designed and constructed for containing, under safety conditions, any possible fragments that can be released during the processing, also in the case of breakage or explosion of the grinding wheel during its rotation and of the engagement on the cylinder being processed.
- In short, these grinding wheels are currently enclosed in their own shelter, which generally consists of a fixed part (so-called hood), and a movable part (so-called tile) in addition obviously to a covering and movable protection device to have access to the hood for the substitution of the grinding wheel; in particular, these covers can be fixed to the hood by means of hinges and can be opened by rotating them; or by means of guiding devices in which case they can be made to slide manually or with a motor. The tile can be regulated with respect to the hood in order to limit the peripheral portion of non-protected grinding wheel to the maximum, with a variation in the diameter of the grinding wheel itself
- In this respect, reference can be made to the safety regulations UNI EN 13128 and it can be deduced that, for example, shelters for grinding wheels with a diameter D>125 mm must be designed so that, due to peripheral wear, the span between the periphery of the grinding wheel and the movable shelter of the same grinding wheel must be kept at less than or equal to 5 mm.
- In view of this requirement, it should also be noted that in current shelters for grinding wheels, the regulation of the distance between the periphery of the grinding wheel and the shelter is generally manual.
- When a new grinding wheel is installed, its diameter is normally known and consequently it is generally possible to assign the desired position to the tile without making a direct measurement of the span between tile and periphery of the grinding wheel.
- During the processing, however, the operator does not know the wear of the grinding wheel moment by moment and in order to satisfy the safety requirement described above, he should verify, after each grinding cycle of the machine, the distance between tile and grinding wheel and consequently intervene to re-establish the safety distance by maneuvering screw controls and/or knobs which allow the tile to be regulated with respect to the grinding wheel.
- Furthermore, the cooling fluid necessary for the grinding process causes jets which could, with time, endanger the health of the operator if they regularly reach the latter. It is consequently necessary to minimize the exposed surface of the grinding wheel, also on the side where there is access for substitution, in order to avoid jets and the accidental leakage of the cooling fluid as much as possible.
- A general objective of the present invention is to solve the drawbacks cited above of the known art in an extremely simple, economical and particularly functional manner.
- A further objective of the present invention is to provide a protection device for a grinding wheel, particularly but not exclusively a rotating grinding wheel made of abrasive material, which can be automatically regulated, without the necessity of complex measurements entrusted to the expertise of the operator for maintaining the correct distance between grinding wheel and outer covering element (tile) and, above all, without the direct intervention of the operator in a difficult, tiring and dangerous operation.
- Another objective of the present invention is to provide a protection device, for example, for a rotating grinding wheel made of abrasive material, which prevents a significant leakage of cooling liquid in the processing phase, in every configuration of the protection device and for each diameter of the grinding wheel.
- In view of the above objectives, according to the present invention, a protection device has been conceived, particularly but not exclusively for a rotating grinding wheel made of abrasive material, having the characteristics specified in the enclosed claims.
- The structural and functional characteristics of the present invention and its advantages with respect to the known art will appear more evident from the following description, referring to the enclosed drawings which, among other things, show an embodiment of a protection device for a rotating grinding wheel made of abrasive material produced according to the same invention.
- In the drawings:
-
FIG. 1 is a schematic side view of a protection device for a rotating grinding wheel made of abrasive material produced according to the invention in a closed position; -
FIG. 2 is a schematic view such as that ofFIG. 1 in which some of the parts have been sectioned to allow a better understanding of the invention; -
FIG. 3 is a schematic view such as that ofFIG. 2 in which some of the parts have been sectioned to allow a better understanding of the invention and which shows the configuration convenient for the insertion of a new grinding wheel; -
FIG. 4 is a schematic side view of the protection device as shown inFIG. 3 ; -
FIGS. 5 a, 5 b and 5 c are a further view such as that ofFIG. 1 from above and an enlarged detail which shows the grinding wheel in contact with the sensor for revealing the actual diameter of the grinding wheel before the facing and grooving cycle; -
FIGS. 6 a, 6 b and 6 c show views similar to those ofFIGS. 5 a, 5 b and 5 c when the grinding wheel is in contact with the diamond during the so-called “diamonding” or facing and grooving phase; -
FIGS. 7 a, 7 b and 7 c show views similar to those ofFIGS. 5 a, 5 b and 5 c which represent the phase in which the correct distance between the fixed part and movable part of the protection device is re-established to ensure the safety requirements described above. - With reference to the figures, these illustrate a protection device for a rotating grinding wheel made of abrasive material produced according to the invention.
- The protection device comprises a containment structure comprising a fixed
portion 11 with respect to the rotation axis of the grinding wheel assembled on the grinding machine and amovable portion 12. - The
movable portion 12 is assembled on a pair ofscraping guides 13, having a low friction coefficient, positioned on opposite sides with respect to the grinding wheel. - The
fixed portion 11 comprises, constrained to it for example by means ofhinges 14, a covering andprotection element 15 of the containment structure of agrinding wheel 16. - A motor or driving device, for example a
pneumatic cylinder 17, and astem 18 with which, at its free end, it is hinged to themovable portion 12, is constrained to the fixedportion 11 of the containment structure. Anelectromagnetic blocking unit 19 of themovable part 12 with respect to thefixed part 11 is alsoprovided. - A
blocking element 20, for example mechanical, acts as a safety device for the movement of themovable portion 12 with respect to the fixedportion 11. This element can, for example, be a stem-block, which comprises a suitable valve which, when fed with pressurized air, prevents the cylinder from effecting movements due, for example, to the residual compressed air inside the cylinder. - The
motor 17 is also equipped with asensor 26 suitable for automatically identifying the position of themovable portion 12 corresponding to a new grinding wheel. - It should be pointed out that, in the embodiment proposed, once the covering
element 15 has been overturned to close thegrinding wheel 16, it is firmly fixed by means ofspecific knobs 21 which can be substituted by equivalent means in the case of sliding covering elements. - Furthermore, inside the movable portion close to the area in which the operating opening 22 for the grinding
wheel 16 is positioned, there is anozzle 23 for the emission of cooling and lubricating liquid between the grindingwheel 16 and piece under processing. - Finally, the following devices are assembled on the so-called “piece-holder head” or that part of the grinding machine which rotates the piece being processed: a
sensor 25 for revealing the diameter of the grinding wheel before the diamonding, a “diamonding” or facing and groovingunit 29 and, finally, amechanical buffer 24 on which themovable part 12 rests during the automatic positioning cycle of themovable part 12 with respect to thefixed part 11. Theseelements movable portion 12 and near the operating opening 22 when the grinding wheel-holder trolley positions the grinding wheel itself in correspondence with the piece-holder head. - The functioning of a protection device for a rotating grinding wheel made of abrasive material produced according to the invention is as follows.
- It is first of all necessary to open the covering
element 15 by overturning it to be able to position anew grinding wheel 16, as shown inFIG. 3 . - In order to do this, the grinding wheel-holder trolley is brought to a “grinding wheel substitution” position, the advance axis X of the grinding wheel is then withdrawn completely, the
electromagnetic brake 19 is unblocked, thecylinder 17 is activated by means of thecontrol unit 27 to move themovable portion 12 away from thefixed portion 11 to allow thegrinding wheel 16 to be inserted. In this phase the cylinder goes to the run-end. All the above operations, except for the opening of the coveringelement 15, can be effected sequentially or automatically, once the specific grinding wheel substitution procedure has been activated on thecontrol unit 27. - Once the
grinding wheel 16 has been firmly positioned, the coveringelement 15 is closed and firmly fixed by means of theknobs 21 or another equivalent blocking device. - At this point, by activating the
cylinder 17 in recall mode, themovable portion 12 is brought back onto thefixed portion 11 until thesensor 26 identifies the correct starting operative position on the basis of the maximum value of the diameter of thegrinding wheel 16 used. - The
cylinder 17 is then stopped and theelectromagnetic blockage unit 19 is activated (FIG. 1 ). - The operating cycle initiates with the intervention of the
grinding wheel 16 for example on a cylinder to be ground (not shown). - The diameter of the
grinding wheel 16 is controlled by control means of the whole grinding machine consisting of a CNC system, schematized in 27, and when there is a wear of 2-3 mm, a warning/alarm is visualized on adisplay 28 asking the operator to effect a procedure for reestablishing the safety distance between themovable portion 12 and the fixedportion 11 as soon as possible, i.e. at the end of the grinding cycle underway. - The regulation of the
movable part 12 with respect to thefixed part 11 can, for example, be effected by means of an automatic cycle managed by thecontrol system 27 after requesting the operator, and is composed of the following phases: - a) The grinding machine positions the grinding wheel-holder trolley so that the grinding wheel is in correspondence with the
sensor 25 situated onboard the piece-holder head. The advancement axis X of the grinding wheel moves the grinding wheel itself towards the sensor. When the sensor is touched by the grinding wheel, the advancement movement stops and thecontrol system 27, on the basis of the position of the advancement axis X of the grinding wheel and original diameter of the new grinding wheel, calculates the present diameter.
b) At this point, the grinding wheel-holder trolley is positioned so that the grinding wheel is in correspondence with the facing and groovingunit 29 situated onboard the piece-holder head and the facing and grooving is effected automatically. Thecontrol system 27 automatically calculates the decrease in the diameter of the grinding wheel in relation to the increase in the advance axis X of the grinding wheel.
c) Finally, the grinding wheel is positioned so as to put themovable part 12 in correspondence with thereference 24 situated onboard the piece-holder head until it touches it. Thebrake 19 is unblocked and the advance axis X of the grinding wheel advances until themovable part 12 touches thereference 24. At this point, on the basis of the present diameter of the grinding wheel after the facing and grooving and safety distance established between themovable part 12 and fixedpart 11, thecontrol system 27 activates the advance axis X of the grinding wheel which “pushes” themovable part 12 which, as it is not braked and thepiston 17 is not charged, moves towards thefixed part 11 positioning themovable part 12 at the desired distance from the grinding wheel. The run of the advance axis X of the grinding wheel necessary for effecting this operation is calculated automatically by thecontrol system 27. - Once the
movable part 12 has reached the predetermined position, themagnetic blocking unit 19 is activated. - The operating cycle initiates with the intervention of the
grinding wheel 16. It can therefore be understood how the correct position of the protection device is imparted giving the operator more protection in the case of explosion of the grinding wheel and preventing the operator from having any contact with fragments made of abrasive material. - Furthermore, the safety of always operating at the correct distance between the
grinding wheel 16 andcontainment structure wheel 16 and onto the piece, minimizing the jets outside the machine and preventing damages to the operator's health. - Finally, the possibility of effecting all these operations by means of an automatic cycle considerably increases the comfort of the operator who is no longer obliged, each time the
movable part 12 is to be moved towards the fixedpart 11, to measure the distance between thegrinding wheel 16 andmovable part 12 and effect manual operations which, as mentioned above, are inconvenient, difficult and dangerous. - The previously indicated objectives have therefore been achieved.
- The forms of the structure for producing a protection device for a rotating grinding wheel made of abrasive material according the invention, as also the materials and assembly modes, can obviously differ from those shown for purely illustrative and non-limiting purposes in the drawings.
- In particular, as already specified, the invention can be indifferently applied to hoods with both a sliding and rotating cover.
- The protection scope of the invention is therefore delimited by the enclosed claims.
Claims (7)
1. A protection device for a grinding wheel, comprising:
a containment structure having an operating opening (22) for a grinding wheel (16), wherein said containment structure comprises,
a fixed portion (11),
a movable portion (12) configured to be moved with respect to the fixed portion (11) by a motor (17) and to be blocked with respect to the first fixed portion (11) by a magnetic blocking unit (19),
a first sensor (26), which identifies a correct operational starting position based on a diameter of the grinding wheel (16), and
a control unit for the protection device (27).
2. The protection device according to claim 1 , wherein said motor comprises a pneumatic cylinder (17).
3. The protection device according to claim 1 , further comprising a pair of low-friction scraping guides (13) assembled between said fixed portion (11) and said movable portion (12).
4. The protection device according to claim 1 , wherein said fixed portion (11) comprises a covering element (15), constrained to said fixed portion with hinges (14), said covering element being configured to be overturned to open the containment structure (11, 12) to allow the a positioning of the grinding wheel (16).
5. The protection device according to claim 1 , wherein a mechanical reference point (24) is positioned, externally with respect to said movable portion (12), in proximity of the operating opening (22), said mechanical reference point collaborating with a second sensor (25) that establishes the diameter of the grinding wheel (16) and that is positioned externally with respect to the containment structure (11, 12), but firmly fixed with respect to the fixed portion (11) together with a diamond or grooving unit (29) of the grinding wheel (16).
6. The protection device according to claim 1 , further comprising a nozzle (23) disposed inside said movable portion (12), in proximity of an area in which the operating opening (22) for the grinding wheel (16) is positioned, said nozzle (23) providing cooling oil onto the grinding wheel (16).
7. The protection device according to claim 1 , wherein said control unit of the protection device comprises a CNC system (27) which controls the diameter of the grinding wheel (16) when a maximum tolerated wear level is reached, and a warning/alarm visualized on a display (28).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI2010A001458A IT1401503B1 (en) | 2010-08-02 | 2010-08-02 | PROTECTION DEVICE FOR A DISC WHEEL |
ITMI2010A001458 | 2010-08-02 | ||
PCT/EP2011/003190 WO2012016611A1 (en) | 2010-08-02 | 2011-06-29 | Automatically adjustable protection device for a grinding wheel |
Publications (1)
Publication Number | Publication Date |
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US20130130603A1 true US20130130603A1 (en) | 2013-05-23 |
Family
ID=43739489
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/810,449 Abandoned US20130130603A1 (en) | 2010-08-02 | 2011-06-29 | Automatically adjustable protection device for a grinding wheel |
Country Status (9)
Country | Link |
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US (1) | US20130130603A1 (en) |
EP (1) | EP2601013A1 (en) |
JP (1) | JP2013535347A (en) |
KR (1) | KR20130094296A (en) |
CN (1) | CN103052469A (en) |
CA (1) | CA2805169A1 (en) |
IT (1) | IT1401503B1 (en) |
RU (1) | RU2013102136A (en) |
WO (1) | WO2012016611A1 (en) |
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US20130280993A1 (en) * | 2010-12-24 | 2013-10-24 | Komatsu Ntc Ltd. | Scattering prevention structure of grinding machine |
CN105312989A (en) * | 2015-11-30 | 2016-02-10 | 周建绿 | Construction steel bar polishing device with limit function |
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US5111625A (en) * | 1990-06-01 | 1992-05-12 | Diskus Werke Frankfurt Am Main Aktiengesellschaft | Machine for contour grinding outside peripheral surfaces of workpieces |
US5396122A (en) * | 1991-02-26 | 1995-03-07 | Elge Elektronik-Geratewerk Gmbh & Co. | Door or protective hood locking control system as a safety device for machines |
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DD227076A1 (en) * | 1984-09-26 | 1985-09-11 | Werkzeugmaschinenbau Fz | DEVICE FOR SELF-TIMING ADJUSTMENT OF THE PROTECTIVE SCREEN OF A GRAPH DISCONNECTOR |
JPS61188077A (en) * | 1985-02-14 | 1986-08-21 | Alps Electric Co Ltd | Truing device |
JP2566245B2 (en) * | 1987-07-09 | 1996-12-25 | 豊田工機株式会社 | Pre-grinding stone cover compensator |
JPH0266928U (en) * | 1988-11-10 | 1990-05-21 | ||
JPH0671056U (en) * | 1993-03-19 | 1994-10-04 | フジオーゼックス株式会社 | Grinding wheel cover |
US6636153B1 (en) * | 2000-07-26 | 2003-10-21 | Simon C. Barton | Sensing system for magnetic clamping devices |
JP2006068838A (en) * | 2004-08-31 | 2006-03-16 | Toyoda Mach Works Ltd | Grinding wheel guard device |
DE102006041671B4 (en) * | 2006-09-06 | 2018-03-29 | Robert Bosch Gmbh | Protective hood of a hand tool machine |
WO2008032333A1 (en) * | 2006-09-13 | 2008-03-20 | Uttam Sarda | An electro permanent magnetic work holding system which clamps ferromagnetic work piece(s) and simultaneously senses displacement |
JP3138361U (en) * | 2007-10-18 | 2007-12-27 | 株式会社丸仲鉄工所 | Blade polishing equipment |
-
2010
- 2010-08-02 IT ITMI2010A001458A patent/IT1401503B1/en active
-
2011
- 2011-06-29 JP JP2013522117A patent/JP2013535347A/en active Pending
- 2011-06-29 EP EP11729066.8A patent/EP2601013A1/en not_active Withdrawn
- 2011-06-29 KR KR1020137002480A patent/KR20130094296A/en not_active Application Discontinuation
- 2011-06-29 WO PCT/EP2011/003190 patent/WO2012016611A1/en active Application Filing
- 2011-06-29 US US13/810,449 patent/US20130130603A1/en not_active Abandoned
- 2011-06-29 RU RU2013102136/02A patent/RU2013102136A/en not_active Application Discontinuation
- 2011-06-29 CA CA2805169A patent/CA2805169A1/en not_active Abandoned
- 2011-06-29 CN CN2011800382871A patent/CN103052469A/en active Pending
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DE2613160A1 (en) * | 1976-03-27 | 1977-10-06 | Karstens Georg Messgeraete | Protecting cover for grinding machine - has box covering sides of wheel and shield to cover part of wheel front |
US5111625A (en) * | 1990-06-01 | 1992-05-12 | Diskus Werke Frankfurt Am Main Aktiengesellschaft | Machine for contour grinding outside peripheral surfaces of workpieces |
US5396122A (en) * | 1991-02-26 | 1995-03-07 | Elge Elektronik-Geratewerk Gmbh & Co. | Door or protective hood locking control system as a safety device for machines |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130280993A1 (en) * | 2010-12-24 | 2013-10-24 | Komatsu Ntc Ltd. | Scattering prevention structure of grinding machine |
US8777700B2 (en) * | 2010-12-24 | 2014-07-15 | Komatsu Ntc Ltd. | Scattering prevention structure of grinding machine |
CN105312989A (en) * | 2015-11-30 | 2016-02-10 | 周建绿 | Construction steel bar polishing device with limit function |
Also Published As
Publication number | Publication date |
---|---|
WO2012016611A1 (en) | 2012-02-09 |
WO2012016611A8 (en) | 2012-08-16 |
ITMI20101458A1 (en) | 2012-02-03 |
JP2013535347A (en) | 2013-09-12 |
EP2601013A1 (en) | 2013-06-12 |
RU2013102136A (en) | 2014-09-10 |
CA2805169A1 (en) | 2012-02-09 |
KR20130094296A (en) | 2013-08-23 |
IT1401503B1 (en) | 2013-07-26 |
CN103052469A (en) | 2013-04-17 |
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