WO2021009654A1 - Changing station for abrasive belts - Google Patents

Changing station for abrasive belts Download PDF

Info

Publication number
WO2021009654A1
WO2021009654A1 PCT/IB2020/056552 IB2020056552W WO2021009654A1 WO 2021009654 A1 WO2021009654 A1 WO 2021009654A1 IB 2020056552 W IB2020056552 W IB 2020056552W WO 2021009654 A1 WO2021009654 A1 WO 2021009654A1
Authority
WO
WIPO (PCT)
Prior art keywords
retaining
station
fact
bearing plane
retaining elements
Prior art date
Application number
PCT/IB2020/056552
Other languages
French (fr)
Inventor
Luciano Passoni
Original Assignee
Sir S.P.A.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from IT102019000012102 external-priority
Application filed by Sir S.P.A. filed Critical Sir S.P.A.
Priority to EP20747475.0A priority Critical patent/EP3999276A1/en
Publication of WO2021009654A1 publication Critical patent/WO2021009654A1/en

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00Machines or devices using grinding or polishing belts; Accessories therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/18Accessories
    • B24B21/20Accessories for controlling or adjusting the tracking or the tension of the grinding belt
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B27/00Other grinding machines or devices
    • B24B27/0038Other grinding machines or devices with the grinding tool mounted at the end of a set of bars
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00Component parts such as frames, beds, carriages, headstocks
    • B24B41/02Frames; Beds; Carriages

Abstract

The changing station (1) for abrasive belts comprises: at least one supporting base (2) comprising one bearing plane (3) for at least one abrasive belt (4) applicable to a sanding head (T); retaining means (5, 7, 8) for the abrasive belt (4) associated with the bearing plane (3) and comprising one pair of retaining elements (5) spaced apart from each other and movable between a retaining position, wherein they are substantially protruding with respect to the bearing plane (3) and said abrasive belt (4) is positioned around them and is held on the bearing plane (3), and a release position, wherein they are substantially retracted with respect to the bearing plane (3) to release the abrasive belt (4); and thrust means (6) of the retaining elements (5) from the release position to the retaining position, the retaining elements (5) being adapted to be moved from the retaining position to the release position due to the action of the sanding head (T).

Description

CHANGING STATION FOR ABRASIVE BELTS
Technical Field
The present invention relates to a changing station for abrasive belts.
Background Art
In particular, the present changing station for abrasive belts is usable in robotized cells for sanding and finishing metal workpieces.
The robotized cells allow the execution of different operations without the direct intervention of human operators and an articulated robotic arm is housed inside them.
The use of automated robotic arms makes it possible to replace the manual work of the operators, thus limiting the risks for their safety and significantly reducing processing times.
The robotic arm is able to pick up a series of tool heads from special positions and to bring them into contact with the metal workpieces.
Among these, sanding heads are used, e.g., for the removal of welding burrs and the final finishing of the workpiece by means of the use of suitable abrasive belts.
The abrasive belt, in particular, is closed in a loop and is set in rotation by the sanding head by means of a motorized roller.
More specifically, the movement is provided by a series of rollers, spaced apart from each other, which at the same time keep the belt taut.
The abrasive belts used in the aforementioned sanding heads need to be changed with others of different grind depending on the desired finish or to be replaced after wear.
The installation of the abrasive belt must be carried out with precision in order to position it correctly on the rollers.
However, this generally leads to a lengthening in the processing time with a consequent increase in the related costs.
Description of the Invention
The main aim of the present invention is to devise a changing station for abrasive belts that allows reducing the time and costs related to this operation. Within this inventive concept, one object of the present invention is to enable the installation of abrasive belts quickly and safely.
Another object of the present invention is to devise a changing station for abrasive belts that allows precise installation of the abrasive belts onto the sanding head.
Another object of the present invention is to devise a changing station for abrasive belts that allows overcoming the aforementioned drawbacks of the prior art within a simple, rational, easy, effective to use and low cost solution. The aforementioned objects are achieved by the present changing station for abrasive belts having the characteristics of claim 1.
Brief Description of the Drawings
Other characteristics and advantages of the present invention will be more evident from the description of a preferred, but not exclusive, embodiment of a changing station for abrasive belts, illustrated by way of an indicative, yet non limiting example, in the attached tables of drawings wherein:
Figure 1 is an axonometric view of the changing station for abrasive belts according to the invention;
Figures 2-4 are side sectional views of the changing station for abrasive belts in different configurations of use.
Embodiments of the Invention
With particular reference to these figures, a changing station for abrasive belts has been globally indicated with reference numeral 1.
The station 1 is usable in robotized cells for sanding and finishing metal workpieces with the aid of an articulated robotic arm.
The robotic arm is able to pick up a series of tool heads from special positions and to bring them into contact with the metal workpieces to be processed.
The station 1, according to the invention, comprises at least one supporting base 2 comprising at least one bearing plane 3 for at least one abrasive belt 4 applicable to a sanding head T.
In detail, the abrasive belt 4 is closed in a loop and is applicable to the sanding head T at the point where motorized rollers R are located which are adapted to keep it taut and to move it in order to carry out sanding and finishing operations. The station 1 is provided with retaining means 5, 7, 8 for retaining the abrasive belt 4 associated with the bearing plane 3 and comprising at least one pair of retaining elements 5 spaced apart from each other and movable between a retaining position, wherein the retaining elements 5 are substantially protruding with respect to the bearing plane 3 and the abrasive belt 4 is positioned around the retaining elements 5 themselves and is held on the bearing plane 3, and a release position, wherein the retaining elements 5 are substantially retracted with respect to the bearing plane 3 to release the abrasive belt 4.
In addition, the station 1 comprises thrust means 6 of the retaining elements 5 from the release position to the retaining position: the retaining elements 5 are adapted to be moved from the retaining position to the release position due to the action of the sanding head T.
The sanding head T exerts a pressing force on the retaining elements 5, which are shifted to the release position, thus releasing the abrasive belt 4.
In the release position, therefore, the motorized rollers R of the sanding head T are surrounded by the abrasive belt 4.
As shown in detail in the figures, the bearing plane 3 is substantially horizontal and the abrasive belt 4 rests thereon; in particular, the abrasive belt 4 is positioned on the bearing plane 3 so as to surround the retaining elements 5.
The retaining elements 5 are spaced appropriately apart from each other so that the abrasive belt 4 is kept stationary in the retaining position.
The retaining elements 5 are positioned in such a way as to define a coupling to corresponding motorized rollers R of the sanding head T.
For this purpose, at least one of the retaining elements 5 is of the type of a cylindrical support.
In the embodiment shown in the figures, both the retaining elements 5 are of the cylindrical support type.
In addition, the retaining means 5, 7, 8 comprise at least one tensioning element 7 of the abrasive belt 4, in the retaining position.
The tensioning element 7 operates in conjunction with the retaining elements 5 to keep the abrasive belt 4 stationary and stable on the bearing plane 3.
The tensioning element 7 is in turn movable between the retaining position, wherein it is substantially protruding with respect to the bearing plane 3 and keeps the abrasive belt 4 taut, and the release position, wherein it is substantially retracted with respect to the bearing plane 3 to free the abrasive belt 4.
The tensioning element 7 is also moved from the retaining position to the release position by the sanding head T on the retaining elements 5.
The tensioning element 7 is positioned so as to define a coupling to a corresponding motorized roller R of the sanding head T.
The tensioning element 7 is misaligned with respect to the pair of retaining elements 5.
In more detail, the tensioning element 7 is arranged in a far-away position from an ideal joining axis of the two retaining elements 5.
In even more detail, the retaining elements 5 and the tensioning element 7 are arranged together to form a triangle.
Again with reference to the preferred embodiment shown in the figures, the tensioning element 7 is of the type of a fin.
The retaining means 5, 7, 8 comprise a holding element 8 of the retaining elements 5 and of the tensioning element 7.
The holding element 8 is substantially of the type of a rigid plate to which the retaining elements 5 and the tensioning element 7 are locked integrally.
The holding element 8 ensures that the retaining elements 5 and the tensioning element 7 move at the same time after the interaction with the sanding head T. The holding element 8 is in turn movable between the retaining position, wherein it is moved close to the bearing plane 3, and the release position, wherein it is moved away from the bearing plane 3.
Substantially, the pressure force of the sanding head T on the retaining elements 5 gives movement to the holding element 8, which shifts away from the bearing plane 3.
In more detail, the holding element 8 is arranged lower than the bearing plane 3 and the retaining elements 5, as well as the tensioning element 7, are shifted between the retaining position and the release position through respective openings made on the bearing plane 3.
Advantageously, the thrust means 6 are associated with the supporting base 2 and with the holding element 8.
This way, the thrust means 6 move the retaining elements 5 and the tensioning element 7 at the same time towards the retaining position.
Preferably, the thrust means 6 are of the type of elastic means.
More specifically, the thrust means 6 are of the type a spring provided with one end associated with the supporting base 2 and with the opposite end associated with the holding element 8.
In addition, the supporting base 2 comprises guidance means 9 of the holding element 8.
The guidance means force the holding element 8 to shift between the retaining position and the release position so as to always keep substantially parallel to the bearing plane 3.
In doing so, the retaining means 5, 7, 8 are shifted along a direction that is always substantially orthogonal to the bearing plane 3.
In more detail, the guidance means comprise a pair of guidance elements 9 associated with the holding element 8 and adapted to slide inside respective seats defined in the supporting base 2.
Advantageously, the station 1 comprises a plurality of retaining means 5, 7, 8 arranged side by side to each other with respect to the bearing plane 3.
This way, a plurality of abrasive belts 4 can be positioned on a single bearing plane 3 at the point where the respective retaining means 5, 7, 8 are located. Conveniently, the abrasive belts 4 may be of the same type or with different grinds.
The station 1 comprises a load-bearing structure 10, wherein the supporting base 2 is associated in a movable manner with the load-bearing structure 10 between an operating position, wherein it is arranged inside an operating area for the picking of the abrasive belts by means of the sanding head T, and a home position wherein it is moved away from the operating area.
In particular, the supporting base 2 is movable by sliding between the operating position and the home position.
In more detail, in the home position, the supporting base 2 is moved to a loading area, wherein the abrasive belts 4 can be positioned by an operator at the point where the retaining means 5, 7, 8 are located.
Advantageously, the station 1 comprises at least one motor unit 11 operationally connected to the supporting base 2 and adapted to move the supporting base 2 between the operating position and the home position.
In more detail, the supporting base 2 is connected to the motor unit 11 through a toothed belt 12.
The toothed belt 12 is set in motion by a pulley associated with the motor unit itself.
Conveniently, as shown by way of example in Figure 1 , the station 1 comprises a plurality of supporting bases 2.
The supporting bases 2 are movable with respect to each other so that at least one of the supporting bases 2 is positioned in the operating area and that, therefore, there are always abrasive belts 4 available for the sanding head T.
The station 1 comprises at least one pair of supporting bases 2.
The supporting bases 2 are connected to each other by means of the toothed belt 12 so that when one supporting base 2 is brought towards the loading area, the other supporting base 2 moves towards the operating area.
The operation of the present invention is as follows.
The supporting base 2 is moved towards the operating area by the motor unit 11 and the sanding head T is moved to the supporting base 2 by means of an articulated robotic arm.
As shown in Figure 2, the sanding head T is positioned in the proximity of the bearing plane 3 so that the motorized rollers R are positioned at the point where the retaining elements 5 are located.
Afterwards, the sanding head T pushes the retaining means 5, 7, 8 towards the release position so that the abrasive belt 4 is positioned around the motorized rollers R. (Figure 3)
At this point, the sanding head T moves away and the retaining means 5, 7, 8 are returned to the retaining position by the thrust means 6 (Figure 4).
Once the available abrasive belts 4 are finished, the supporting base 2 is moved to the home position to be loaded with new abrasive belts 4.
It has in practice been ascertained that the described invention achieves the intended objects and in particular it is underlined that the changing station for abrasive belts allows reducing the time and costs related to the replacement operation of the abrasive belts from the sanding heads.
The present changing station for abrasive belts enables the abrasive belts to be installed quickly and safely.
In addition, the changing station for abrasive belts ensures precise installation of the abrasive belts to the sanding head.

Claims

1) Changing station (1) for abrasive belts characterized by the fact that it comprises:
at least one supporting base (2) comprising at least one bearing plane (3) for at least one abrasive belt (4) applicable to a sanding head (T);
retaining means (5, 7, 8) for said abrasive belt (4) associated with said bearing plane (3) and comprising at least one pair of retaining elements (5) spaced apart from each other and movable between a retaining position, wherein said retaining elements (5) are substantially protruding with respect to said bearing plane (3) and said abrasive belt (4) is positioned around said retaining elements (5) and is held on said bearing plane (3), and a release position, wherein said retaining elements (5) are substantially retracted with respect to said bearing plane (3) to release said abrasive belt (4); and thrust means (6) of said retaining elements (5) from said release position to said retaining position, said retaining elements (5) being adapted to be moved from said retaining position to said release position due to the action of said sanding head (T).
2) Station (1) according to claim 1, characterized by the fact that said retaining means (5, 7, 8) comprise at least one tensioning element (7) of said abrasive belt (4), in said retaining position.
3) Station (1) according to one or more of the preceding claims, characterized by the fact that said tensioning element (7) is movable between said retaining position, wherein said tensioning element (7) is substantially protruding with respect to said bearing plane (3) and stretches said abrasive belt (4), and said release position, wherein said tensioning element (7) is substantially retracted with respect to said bearing plane (3) to free said abrasive belt (4).
4) Station (1) according to one or more of the preceding claims, characterized by the fact that said tensioning element (7) is misaligned with respect to said pair of retaining elements (5).
5) Station (1) according to one or more of the preceding claims, characterized by the fact that said tensioning element (7) is of the type of a fin. 6) Station (1) according to one or more of the preceding claims, characterized by the fact that at least one of said retaining elements (5) is of the type of a cylindrical support.
7) Station (1) according to one or more of the preceding claims, characterized by the fact that said retaining elements (5) are both of the type of cylindrical supports.
8) Station (1) according to one or more of the preceding claims, characterized by the fact that said retaining means (5, 7, 8) comprise a holding element (8) of said retaining elements (5) and of said tensioning element (7), said holding element (8) being movable between said retaining position, wherein it is moved close to said bearing plane (3), and said release position wherein it is moved away from said bearing plane (3).
9) Station (1) according to one or more of the preceding claims, characterized by the fact that said thrust means (6) are associated with said supporting base (2) and with said holding element (8).
10) Station (1) according to one or more of the preceding claims, characterized by the fact that said thrust means (6) are of the type of elastic means.
11) Station (1) according to one or more of the preceding claims, characterized by the fact that it comprises a plurality of retaining means (5, 7, 8) arranged side by side with respect to said bearing plane (3).
12) Station (1) according to one or more of the preceding claims, characterized by the fact that it comprises a load-bearing structure (10), wherein said supporting base (2) is associated in a movable manner with said load-bearing structure (10) between an operating position, wherein it is arranged inside an operating area for the picking of said abrasive belts (4) by means of said sanding head (T), and a home position, wherein it is moved away from said operating area.
13) Station (1) according to one or more of the preceding claims, characterized by the fact that it comprises at least one motor unit (11) operationally connected to said supporting base (2) and adapted to move said supporting base (2) between said operating position and said home position. 14) Station (1) according to one or more of the preceding claims, characterized by the fact that it comprises a plurality of supporting bases (2).
PCT/IB2020/056552 2019-07-17 2020-07-13 Changing station for abrasive belts WO2021009654A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20747475.0A EP3999276A1 (en) 2019-07-17 2020-07-13 Changing station for abrasive belts

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102019000012102A IT201900012102A1 (en) 2019-07-17 2019-07-17 CHANGE STATION OF ABRASIVE TAPES
IT102019000012102 2019-07-17

Publications (1)

Publication Number Publication Date
WO2021009654A1 true WO2021009654A1 (en) 2021-01-21

Family

ID=68501978

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2020/056552 WO2021009654A1 (en) 2019-07-17 2020-07-13 Changing station for abrasive belts

Country Status (3)

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EP (1) EP3999276A1 (en)
IT (1) IT201900012102A1 (en)
WO (1) WO2021009654A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0847849A (en) * 1994-08-08 1996-02-20 Hitachi Ltd Polishing belt exchanging method for belt polishing device and device thereof
US7886929B2 (en) * 2007-01-18 2011-02-15 Snecma Device for storing and dispensing endless machining belts for a robotic installation
CN105252385A (en) * 2015-11-11 2016-01-20 佛山市博科数控机械有限公司 Multi-station robot belt sander with rear-arranged abrasive belt drive
CN105666290A (en) * 2016-01-29 2016-06-15 苏州普维迪工业自动化有限公司 Large plane grinding device for grinding hardware pliers tool and method based on large plane grinding device
CN106625137A (en) * 2017-03-03 2017-05-10 东莞市铁犀智能科技有限公司 Sanding belt automatic replacing device of belt sander
EP3385030A1 (en) * 2017-04-07 2018-10-10 Flexmill Oy Method and apparatus for installing endless abrasive belt

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0847849A (en) * 1994-08-08 1996-02-20 Hitachi Ltd Polishing belt exchanging method for belt polishing device and device thereof
US7886929B2 (en) * 2007-01-18 2011-02-15 Snecma Device for storing and dispensing endless machining belts for a robotic installation
CN105252385A (en) * 2015-11-11 2016-01-20 佛山市博科数控机械有限公司 Multi-station robot belt sander with rear-arranged abrasive belt drive
CN105666290A (en) * 2016-01-29 2016-06-15 苏州普维迪工业自动化有限公司 Large plane grinding device for grinding hardware pliers tool and method based on large plane grinding device
CN106625137A (en) * 2017-03-03 2017-05-10 东莞市铁犀智能科技有限公司 Sanding belt automatic replacing device of belt sander
EP3385030A1 (en) * 2017-04-07 2018-10-10 Flexmill Oy Method and apparatus for installing endless abrasive belt

Also Published As

Publication number Publication date
EP3999276A1 (en) 2022-05-25
IT201900012102A1 (en) 2021-01-17

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