EP2433747B1 - Method and device for grinding edges of glass boards running parallel to each other - Google Patents

Description

The invention relates to a method for grinding the mutually parallel edges of glass plates, which are continuously transported by means of a horizontal conveyor on the rotating drivable grinding tools over, and that each grinding tool can be acted upon by a coolant flow. The invention also relates to an apparatus for performing the method according to the invention ,

Equipment for grinding the edges of glass plates are known In these systems, each edge of the glass plate is processed by at least three successively arranged grinding tools. As a result, the design effort for such a system is relatively high. The feed rate of the glass plate to be processed is relatively low due to the material, while the peripheral speeds of the grinding tools are relatively high. Due to the material, it is essential that the grinding tools are cooled by a coolant during the grinding process. This cooling liquid is supplied via a supply line and the cooling liquid is collected and recycled for further use

The flat, the thickness of the glass plate determining surfaces are particularly high quality and depending on the intended use with a coating of a high quality material provided. Due to the previous coolant supply, it is unavoidable that coolant is sprayed onto these flat surfaces. This leads to an impairment of the surface or the coating, so that a rework is required.

In the previously known systems not only the design effort, due to three successively arranged grinding tools, very expensive, but the surface quality of the thickness of the glass plate determining surface or the coating can be achieved only by rework.

The US 2003/0236060 discloses a glass plate grinding machine in which a plurality of grinding stations are arranged one behind the other. Each grinding station can have a supply system for a coolant.

The DE 100 20 800 shows a device for finishing an edge of a glass plate, in which a grinding wheel is sprayed at its upper and its lower edge with cooling liquid. Further, a mixture of glass dust and water is collected via a vacuum device which is generated within the housing during the grinding of the glass plate.

The invention has for its object to provide a method of the type described in more detail, in the implementation of the design complexity of a plant is minimized and the machined glass plates have a surface finish that meets the requirements without rework. The invention is further based on the object to show a working device according to the invention, in which at least the design effort for the arrangement of the grinding tools is reduced, and which is also designed so that the flat surfaces and the coatings during the grinding process remain free of the coolant.

The object directed to the method is solved by the subject matter of claim 1.

The design effort for a device operating according to the invention device is already reduced by the fact that the number of grinding units is reduced to two pieces, preferably favoriist, that each edge is processed by means of a single Schleifaggragates.

Since the coolant flow is now directed from the side of the glass plate on the grinding tool, it is effectively prevented that coolant is sprayed onto the flat sides of the glass plate. By dividing the coolant flow in a plurality of coolant fine streams optimum distribution of the coolant and thus the best possible cooling of the grinding tool is achieved.

Since now the coolant is sucked by means connected to the vacuum source Kühlmittelabsaugleitungen, wherein the height of the vacuum and the diameter of the suction are coordinated so that the coolant passes exclusively in the direction of the suction, splashing is effectively prevented on the flat sides of the glass plate ,

Since now determines the position of each grinding tool height and the diameter of the grinding tool is detected, the machining of the edge can already be done by a single grinding tool, since the position of the peripheral surface of the grinding tool to the edge does not change, mutatis mutandis during the grinding process can be done an adjustment. This process is called calibration. By calibrating and detecting the height of the grinding tool, it is possible that in coordination with the feed rate of the glass plate with the infeed movement of the grinding tool as a smooth surface to be regarded chamfered bevel.

By grinding the chamfers in the corner regions of the glass plates, an additional operation is prevented, so that the efficiency of a system operating according to the method of the invention is increased.

In a further embodiment it is provided that the Luftabsaugströmung is so intense that the centrifugal force of the grinding tool is overcome during the grinding process, so that a clearance for the air is formed.

By this free space creates an air bubble, so that the coolant can flow continuously into this space, thereby preventing the coolant from reaching the flat sides of the glass plate.

It is also advantageous for the method according to the invention if, by means of a grinding device associated with the grinding tool, the grinding tool is transferred to the desired state, i. the grinding tool, usually a grinding wheel, is machined on the peripheral surface so that the changes in the peripheral surface resulting from the wear are eliminated, i. the surface quality of the peripheral surface of the grinding wheel is always optimized.

The object directed to the device for grinding the mutually parallel edges of glass plates, in particular for carrying out the method, is achieved by a device according to claim 4.

The design effort is reduced in the device in that each edge of the glass sheet is processed with a maximum of two grinding tools, but preferably with a grinding tool. This is made possible by the units explained below. However, it is essential for the device that the Kühlmittelzuführleitung is guided laterally past the grinding wheel or the grinding tool, and that the coolant flow is diverted and divided by the deflection and Stromaufteilsegment towards the grinding tool, in the form that the grinding wheel or the Grinding tool is looped semicircular, so that the coolant supply takes place over an angle which may be in the range of 180 °.

In order to change the grinding tool or the grinding wheel in the shortest possible time if necessary, it is provided that each grinding tool is fixed by means of a clamping device on the rotatably driven grinding spindle, and that each grinding tool is arranged in a multi-part housing, wherein the individual housing parts are arranged one above the other, preferably three housing parts are provided, and that the middle housing part, the grinding tool is assigned, that the upper housing part is stationary, and the lower housing part about a vertical Axis for removing the released from the grinding spindle grinding tool is pivotable, and that the deflection and Stromaufteilsegment arranged in the central housing part or that the deflection and Stromaufteilsegment forms the central housing part.

The upper, the drive of the grinding tool associated with the housing part, for example, the storage of the grinding spindle in the immediate vicinity of the grinding tool. If the Schfeifwerkzeug rotates in the middle housing part, and this housing part includes the deflection and Stromaufteilsegment or is designed as a deflection and Stromaufteilsegment, not only an optimal guidance of the coolant flow is achieved, but the design effort is minimized.

Since the lower, the drive of the grinding tool facing away from the housing part, is pivotable about the vertical axis, the grinding tool passes after release of the grinding spindle in this housing part and can then be removed manually. The clamping device is designed so that a release or unlocking of the grinding tool from the outside is possible.

So that the coolant to be sucked off is sucked exclusively in the direction of the suction line, it is provided that the housing part assigned to the grinding tool increases this cross-sectional direction at the housing part assigned to the vacuum source on the side assigned to the vacuum generator. As a result, the centrifugal force of the grinding tool can be overcome by the vacuum.

The vacuum source associated end of this housing part is designed as a flange for connection to the coolant suction.

When grinding the edges of the glass plate results in grinding chips with a relatively small grain size, the hardness of these chips is particularly high. For the separation of these chips it is provided that a separator for the separation of solid particles is provided between the vacuum generator and the coolant suction line. It is then still provided that the Cross-section of the coolant suction line is greater than the cross section of the coolant supply. This additionally prevents coolant from reaching the glass plate to be processed.

In the device in question, it is necessary that various units are set at least on the width of the passing glass plates. It is therefore intended that the device has a fixed portal as a support frame for at least the horizontal conveyor, a central and below the plane of passage of the glass plates lying support bar, the two grinding tools having abrasive aggregates and an actuator for the support strip.

For safe guidance of the glass plates during the grinding process, it is provided that the horizontal conveyor consists of two spaced associated with the edge of the glass plate, connected to at least one vacuum source Saugbandförderern, and that by means of an actuator at least one Saugbandförderer and at least one grinding unit is adjustable.

A constructive simple solution for an actuator of the support rail is given if it is effective transversely to the transport direction of the suction belt conveyor, and that the actuator contains two spaced adjustment belt.

The adjustment of the adjustment of the central support rail is particularly simple, if each adjustment belt consists of two spaced individual belts that the pulleys each Verstellriemens have such different diameters that the rotational speed of a single belt is twice as large as that of the other single belt.

The conveyor belt with the higher speed could be seen as a drive belt and the conveyor belt with the lower circulation speed as an adjustment belt for the Saugbandförderer and possibly also for the grinding unit.

As is known, glass is a material with an extremely high hardness. There are therefore appropriate grinding tools necessary. Due to the hardness of glass, however, a wear of the peripheral surface of the grinding tool is given. However, since the edges to be machined must have a high surface quality, it is provided that each sharpening tool is assigned a sharpening device such that the peripheral surface of the grinding wheel or grinding tool can be considered as smooth surface. The advantage is that no disassembly is necessary for sharpening the grinding tool. Sharpening the abrasive tool is also referred to as peeling. With reference to the accompanying drawings, the invention will be explained in more detail.

Figur 1

eine Teilansicht einer erfindungsgemäßen Anlage zum Schleifen der Kanten von Glasplatten, die Schleifstation mit zwei Schleifaggregaten in perspektivischer Darstellung zeigend,

Figur 2

das Portal der Vorrichtung gemäß der Figur 1 als Einzelheit in perspektivischer Darstellung,

Figur 3

das mit dem Schleifwerkzeug ausgerüstete Schleifaggregat und das dem Schleifwerkzeug zugeordnete Gehäuse in einer sprengbildlichen Darstellung,

Figur 4

eine der Figur 3 entsprechende Darstellung, jedoch im montieren Zustand und

Figur 5

den Stelltrieb zur Verstellung der Saugbandförderer als Einzelheit in perspektivischer Darstellung.

Show it:

FIG. 1

1 shows a partial view of a system according to the invention for grinding the edges of glass plates, showing the grinding station with two grinding units in a perspective view,

FIG. 2

the portal of the device according to the FIG. 1 as a detail in perspective,

FIG. 3

the abrasive aggregate equipped with the grinding tool and the housing associated with the grinding tool in an exploded view,

FIG. 4

one of the FIG. 3 corresponding representation, but in the assembled state and

FIG. 5

the actuator for adjusting the suction belt conveyor as a detail in perspective view.

For the sake of simplified illustration, a complete system for grinding the opposite edges of glass plates is not shown in the figures. The FIG. 1 shows in a perspective and simplified representation of the grinding station 10. This grinding station 10 includes a in the FIG. 2 This portal frame 11 consists essentially of two lateral and vertical columns 12, 13, an upper slide guide 14 and a transversely to the columns 12, 13 stationary cross-beam 15. This cross-beam 15 are paired pulleys 16, 17 associated, are guided over the conveyor belt, not shown. These guide rollers 16, 17 are part of an actuator, not shown, for the glass plates fixing suction belt conveyor 18, 19. The Saugbandförderer 18, 19 are known per se and have a suction box, which is connected to a vacuum source 20. For transporting the glass plates, not shown Each Saugbandförderer 18, 19 equipped with a hinted, perforated conveyor belt.

The grinding station 10 includes two on hand FIG. 3 grinding units 21, 22, which are explained in greater detail, stand at a distance from the suction belt conveyors 18, 19 and are adjustably arranged on the sides of the suction belt conveyors 18, 19 remote from one another. Each sanding unit 21, 22 is equipped with a sharpening device 23, 24 in order to process the grinding tool of the sanding unit 21, 22 after a certain wear.

To each grinding unit 21, 22 is a Kühlmittelabsaugleitung 25, 26 connected, which are formed as a cooling housing, and open in a not further explained separator 27, 28. By means of these separators 27, 28, the solid particles are removed from the cooling water. Each separator 27, 28 is conductively connected to a vacuum generator 29, 30. The cooling water is passed from there into a cooling water tank, not shown, and used for further cooling of the grinding tools.

The Figures 3 and 4 show that in the illustration according to the FIG. 1 left sanding unit 21 each in perspective views. The grinding unit 22 of the opposite right side is constructed in mirror image. The grinding unit 21 includes a grinding tool 31 in the form of a grinding wheel, which is placed on the grinding spindle 33 by means of a clamping device 32, which is not explained in greater detail. On the opposite end of the grinding spindle 33, a pulley 34 is placed, so that the grinding spindle 33 is driven by a belt, not shown, and with a motor.

The grinding tool 31 is located within a housing 35, which consists in the illustrated embodiment of an upper, the grinding spindle 33 facing housing part 36, a middle housing part 37 and a lower, the grinding spindle 33 facing away from the housing part 38. The housing parts 36 and 38 are opened in the direction of the coolant suction line 25. How the particular FIG. 4 shows, the grinding unit 21 is designed so that the grinding tool 31 rotates in the transition region between the central housing part 37 and the lower housing 38.

The segment facing away from the coolant suction line 25 or arcuate end region of the middle housing part 37 is designed as a deflection and current distribution segment, and is closed towards the outside. This Housing part 37 is provided with a connection 39 for the Kühlmittelzuführlekung, not shown. The incoming coolant flow impinges on the coolant suction line 25 facing away from the end and is diverted and divided this end portion of the housing part 37 is provided with an inner ring having a plurality of holes with a has relatively small diameter through these holes through many individual streams are passed to the grinding tool 31 The middle housing part 37 is connected via a flange 40 with the coolant suction line 25. The region between the grinding tool 31 and the flange 40 is formed as a cooling housing and widens in cross-section toward the flange 40th

The lower housing part 38 is pivotable about a vertical axis. If the grinding tool 31 is released by the grinding spindle 33 after the clamping device 32 has been actuated, the lower housing part 38 can be pivoted and the grinding tool can be removed. For changing the grinding tool 31 no assembly work is therefore necessary.

The FIG. 4 shows the grinding unit 21 in the assembled state. Clearly the position of the Schlelfwerkzeuges 31 can be seen. The figure also shows that the grinding unit 21 is extremely compact. The figure also shows that the upper housing part 36 is located within the middle housing part 37.

The FIG. 5 shows in conjunction with the FIG. 1 in that a support rail 41 is always provided centrally between the movable Saugbandförderem 18, 19, which is below the passage plane of the glass plates to be processed transverse to this support rail 41 are two Verstellriemen 42, 43 are provided, which are transverse to the support rail 41 and to the Saugbandförderern 18th , 19 work. These adjustment belts 42, 43 form an actuator for the support rail 41. The adjustment belts 42, 43 are driven by the suction belt conveyor 18, 19, so that the support rail 41 is moved. Each Versteltriemen 42, 43 consists of two individual belt drives 44, 45 wherein the pulleys are matched in diameter from each other so that the rotational speed of the individual belt 45 is 50% of the rotational speed of the individual belt 44. As a result, the support rail 41 is moved at half the drive speed. Since the individual belts 44, 45, due to the smaller diameter of the pulleys, rotate at half the speed, as the Verstellriemen 42, 43, and the support bar 41 is moved at half the speed the suction belt conveyor 18 or 19, so that the support bar 41 is always in the middle between the Saugbandförderern 18, 19.

The invention is not limited to the illustrated embodiment. It is essential that, procedurally, the coolant flow is deflected by a deflecting and flow dividing element so that it impinges on the grinding tool 31 from the side of the glass plate, advantageously dividing this coolant flow into a multiplicity of individual flows. Furthermore, it is important that each glass edge is processed by a maximum of two grinding units 21, 22 but always only by a grinding unit, and that the feed rate of the glass plate and the feed movement of each grinding unit 21, 22 are coordinated so that in the corner regions of the glass plate a smooth-surfaced bevel can be sanded.

LIST OF REFERENCE NUMBERS

10

grinding station

11

portal frame

12

pillar

13

pillar

14

carriage guide

15

crossbeam

16

idler pulley

17

idler pulley

18

suction belt

19

suction belt

20

vacuum source

21

sanding unit

22

sanding unit

23

sharpener

24

sharpener

25

Kühlmittelabsaugleitung

26

Kühlmittelabsaugleitung

27

separator

28

separator

29

vacuum generator

30

vacuum generator

31

grinding tool

32

jig

33

grinding spindle

34

pulley

35

casing

36

housing part

37

housing part

38

housing part

39

connector

40

flange

41

support rail

42

timing belt

43

timing belt

44

Single belt

45

Single belt

Claims (12)

1. Method for grinding the mutually parallel edges of glass boards which can be transported continuously by means of a horizontal conveyor past the mutually opposite and rotationally driveable grinding tools (21, 22), each grinding tool being capable of being acted upon by a coolant stream, and each edge of the glass board being ground by means of a grinding assembly (21, 22) or by means of two grinding assemblies (21, 22) arranged one behind the other, as seen in the run-through direction of the glass boards, characterized in that the coolant stream is directed by a deflecting and stream-dividing element such that it is directed onto the grinding tool (31) from the side of the glass board, in that the coolant stream is divided into a multiplicity of coolant fine streams, and in that the coolant is sucked away by means of a suck-away line (25, 26) connected to a vacuum generator (29, 30), the coolant fine streams being directed towards the suck-away line (25, 26), in that the height position of each grinding tool (31) is determined by means of a tool measurement device and the diameter of the grinding tool (31) is detected, and in that the position of each grinding tool (31) can be set in such a way that at least the position of the grinding tools (31) is calibrated in relation to the assigned edge of the glass board running through and the corners of the glass board are ground into a chamfer.
2. Method according to Claim 1, characterized in that the coolant suck-away flow is intensive in such a way that the centrifugal force of the grinding tool (31) during the grinding operation is overcome so that a free space for air is formed.
3. Method according to Claim 1, characterized in that the grinding tool (31) is converted into the desired state by means of a sharpening device (23, 24) assigned to the grinding tool (31).
4. Device for grinding the mutually parallel edges of glass boards, in particular for carrying out the method according to Claim 1, which is equipped with a horizontal conveyor (18, 19) transporting the glass boards and the mutually opposite grinding tools (31) rotationally driveable in each case by a drive (21, 22), and which is equipped with a coolant supply line for cooling each grinding tool (31), characterized in that the device is equipped on each side of the glass board edge to be ground with a grinding assembly (21, 22) or with two grinding assemblies (21, 22) which are arranged one behind the other, as seen in the run-through direction of the glass boards, and which are equipped with a rotationally drivable grinding tool (31), in that each grinding tool (31) is assigned a lateral coolant supply line and a coolant suck-away line (25, 26) arranged at a distance from the latter, and in that the coolant stream supplied can be diverted and divided by a deflecting and stream-dividing segment (37), from the side of the glass board, in the direction of the grinding tool (31).
5. Device according to Claim 4, characterized in that each grinding tool (31) is fixed on the rotationally driveable grinding spindle (33) by means of a tension device (32), and in that each grinding tool (31) is arranged in a multi-part housing (36, 37, 38), the individual housing parts (36, 37, 38) being arranged one above the other, and in that preferably three housing parts (36, 37, 38) are arranged one above the other, and in that the middle housing (37) is assigned the grinding tool (31), and in that the upper housing part (36) is fixed in place, and in that the lower housing part (38) can be pivoted about a vertical axis for the removal of the grinding tool (31) released from the grinding spindle (33), and in that the deflecting and stream-dividing segment is arranged in the middle housing part (37), or in that the deflecting and stream-dividing segment forms the middle housing part (37).
6. Device according to Claim 5, characterized in that the housing part (37) assigned to the grinding tool (31) is arranged on the side assigned to the vacuum source (29, 30) and increased in cross section.
7. Device according to one or more of the preceding Claims 4 - 6, characterized in that a separator (27, 28) for separating the solid particles is provided between the vacuum generator (29, 30) and the coolant suck-away line (25, 26), and in that the cross section of the coolant suck-away line (25, 26) is larger than the cross section of the coolant supply line.
8. Device according to one or more of the preceding Claims 4 - 7, characterized in that the device has a fixed gantry for at least the horizontal conveyor (18, 19) of a supporting rail (41) lying centrally and beneath the run-through plane of the glass boards, the two grinding assemblies (21, 22) receiving the grinding tools (31), and an actuating drive for the horizontal conveyor (18, 19).
9. Device according to one or more of the preceding Claims 4 - 8, characterized in that the horizontal conveyor consists of two suction-belt conveyors (18, 19) standing at a distance from the assigned edge of the glass board and connected to at least one vacuum source, and in that at least one suction-belt conveyor (18, 19) and at least one grinding assembly (21, 22) can be adjusted in parallel and in distance by means of an actuating drive.
10. Device according to one or more of the preceding Claims 4 - 9, characterized in that an actuating drive for adjusting the supporting rail (41) is active transversely thereto and consists of two spaced-apart adjusting straps (42, 43).
11. Device according to one or more of the preceding Claims 4 - 10, characterized in that each adjusting strap (42, 43) consists of two spaced-apart individual straps (44, 45), in that the deflecting rollers (16, 17) of the adjusting straps (42, 43) have different diameters in such a way that the rotational speed of one individual strap is twice that of the other individual strap.
12. Device according to one or more of Claims 4 - 11, characterized in that each grinding tool (31) is assigned a sharpening device (23, 24) in such a way that the circumferential surface of the grinding tool (31) can be considered as smooth-surfaced.

Images