EP3403763A1 - Grinding machine for grinding a surface of an object - Google Patents

Abstract

The invention relates to a grinding machine for grinding a surface of an object, wherein the grinding machine
a. a plurality of abrasive brushes (2),
i. which are rotatably mounted about a brush rotation axis,

b. at least one brush holder (4),
i. on which at least one of the abrasive brushes (2) is mounted and the
ii. about a support rotation axis (6) is rotatably mounted, and

c. a conveying device for conveying the object at a feed rate through the grinding machine,
the grinding machine having an input device and an output device, wherein
a brush rotation speed about the brush rotation axis and / or a carrier rotation speed about the support rotation axis (6) and / or the feed speed can be set by the input device, and
An expected grinding result can be output by the output device.

Description

The invention relates to a grinding machine for grinding a surface of an object, the grinding machine having a plurality of brushes rotatably mounted about a brush rotation axis, at least one brush holder bearing at least one of the brushes and rotatably mounted about a support rotation axis. and a conveying direction for conveying the object at a feed speed by the grinding machine. Such a grinding machine is for example from the DE 10 2007 022 194 B4 known. Such grinding machines are used for grinding surfaces of objects, wherein the desired grinding result can be chosen very differently. If the workpiece to be machined is further processed, for example painted, after grinding, it is advantageous to achieve as uniform a grinding pattern as possible, so that as far as possible no grinding marks, grooves, grooves or other depressions remain on the surface. If, on the other hand, the surface to be sanded is not further processed, for example, it may well be desirable to leave special types of sanding marks on the surface in order to achieve a decorative effect. This is for example from the DE 10 2011 116 842 A1 It is known to use a grinding machine which is formed with a transverse grinding belt so that the grinding direction is not necessarily perpendicular to the feed direction, but the angle enclosed between the two directions is adjustable. In addition, active areas of the abrasive belt can alternate with passive areas of the abrasive belt.

In grinding machines of the prior art, the distance between the individual brushes on the one hand and the conveyor on the other hand are usually adjustable. This can be reacted to different thick workpieces and also a contact pressure or grinding pressure of the individual brushes are adjusted to the surface to be ground. Grinding machines are known from the prior art, in which this adjustment is automatically sensor-controlled. If the same grinding effect is to be achieved with each workpiece to be ground, this can be achieved with the grinding machines known from the prior art. A change, for example, from a uniform as possible grinding result on a specific grinding pattern is not possible or only with great effort. The invention is therefore based on the object to further develop a grinding machine so that as many different grinding results achieved and the corresponding settings can be made as simple as possible.

The invention achieves the stated object by a grinding machine according to the preamble of claim 1, which is characterized in that the grinding machine has an input device and an output device, wherein a brush rotation speed about the brush rotation axis and / or a carrier rotation speed about the carrier rotation axis and / or or the feed rate is adjustable and by the output device an expected grinding result can be output.

In comparison to grinding machines of the prior art, further parameters can therefore be set in a grinding machine according to the invention. This applies in particular if several of the parameters mentioned in the claim are adjustable. Both the brush rotation speed and the carrier rotation speed and the feed speed have their own influence on the expected grinding result. Since the setting of all these parameters is a multi-dimensional parameter space, even for experienced technicians the individual grinding results are not or only with great difficulty predictable. This is especially true when, for example, the brush rotation speed and the carrier rotation speed are independently adjustable. This in combination with an adjustable feed rate provides a variety of different patterns of movement of the individual brushes relative to the surface to be ground. Therefore, the machine also has an output device, at the expected grinding result, of course can be outputted from the brush rotation speed, the carrier rotation speed and the feed speed.

Preferably, the output device is a display device, for example a display, particularly preferably an LCD or LED display, on which the expected grinding result is shown. This can be done in a black-and-white representation or particularly preferably in a colored representation, wherein the color can preferably encode a grinding depth or an applied grinding pressure. The representation can be two-dimensional or three-dimensional.

The operator of the grinding machine can thus recognize after the setting of the respective parameters on the output device, what the expected grinding result looks like. Optionally, additional parameters, such as brush contact pressure, different brush rotation speeds for different brushes, different carrier rotation speeds for different carriers, the surface finish of the surface to be ground, and other parameters may be entered and included in the expected grinding result output via the output device.

In a preferred embodiment, the grinding machine has an electrical control, in particular a microprocessor, which is set up to calculate the expected grinding result by means of the set parameters. On the electronic data processing device, ie the electrical control, an algorithm is executed in this case, which has been stored in an electronic data storage. The set parameters are introduced into the algorithm and further processed in this. For example, a movement pattern of the individual brushes relative to the surface to be ground is determined. In addition, a surface finish, in particular a surface material of the surface to be ground, can be included in the execution of the algorithm, so that, for example, a grinding depth or different grinding pressure is included in the calculation and included in the expected grinding result.

Advantageously, the grinding machine has a plurality of brush holders, for which different carrier rotation speeds can be set by the input device. Additionally or alternatively, the grinder has multiple abrasive brushes for which different brush rotation speeds are adjustable by the input device. It is quite sufficient for some embodiments to provide identical carrier rotation speeds for some of the brush supports and / or to provide identical rotation speeds for some of the brushes. In this case, the different brush holders and / or the different brushes, if necessary, can only be adjusted together to a respective rotational speed.

Preferably, the brush holder are rotatable in the same direction. To means that they can all be rotated in the same direction, ie with the same sense of rotation, for example in a clockwise direction.

Advantageously, the brush holder are arranged offset in the feed direction. It is thereby achieved that the effective circuits of the individual brush carriers and of the brushes located thereon can definitely overlap along a direction transverse to the feed direction. This prevents that there are areas of the surface to be sanded, which can not or too much be processed by a brush. In a particularly preferred embodiment, the distance of the individual brush holder in the feed direction and / or is adjustable transversely to the feed direction. This also influences the grinding result and thus increases the versatility of the grinding results to be achieved.

Preferably, the brush holder are arranged so that the active circles of the brushes overlap. Under a circle of action of a brush is in particular the area understood that is swept by a brush when the brush holder, where the brush is, performs a revolution. The circle of action of a brush holder is the sum of the active circles of the brushes, which are arranged on the respective brush holder.

Active circuits can overlap directly. This happens when there are points that are covered by two different brushes, even if the Surface is not moved, but only the brush holder to be moved. Active circuits can also overlap indirectly. In this case, points on the surface to be ground are only swept by a plurality of brushes, which are arranged on different brush holders, when the workpiece or object is moved along the feed direction. This type of overlap can be achieved particularly easily if brush holders are offset in the feed direction.

Advantageously, at least one brush holder is mounted eccentrically. This means that the carrier rotation axis does not pass through the center of the brush holder. As a result, the different brushes, which are located on this brush holder, a different distance from the support axis of rotation and thus move during the rotation of the brush holder on circular paths, but these may be different sizes for the different brushes.

In a preferred embodiment, the degree of eccentricity is adjustable by the input device. The degree of eccentricity is, for example, a measure of the distance of the carrier rotation axis from the center of the brush holder. Again, it may be advantageous to design different degrees of eccentricity adjustable for different brush holder.

In a preferred embodiment, the input device has an interface to a data connection, in particular a Bluetooth interface, a USB interface, an Internet application or a wireless interface, for example a radio or WLAN interface. In this way, preset parameter sets can for example be transmitted by a customer and made available to the grinding machine or the electrical data processing device. In addition, via the same data connection, the expected grinding result can also be sent via the output device to another location, for example a customer. It is thus not necessary to be at the site of the grinder to operate or monitor it.

Preferably, the input device has an operating element, by means of which the parameters can be set manually. This may be, for example, a keyboard or a keyboard displayed on a display. Of course, it is also possible to design, for example, an external data processing device, such as a computer, a laptop, a smartphone or a tablet as a corresponding control element. In this case, it is advantageous to install appropriate software on the data processing device. This can be, for example, in the case of a smartphone or a tablet, an app which can be downloaded, for example, from the Internet and allows operation of the grinding machine or at least adjustment of the individual parameters.

The grinding machine preferably has an electronic data memory in which set parameters can be stored. It is sufficient if the grinder has access to a corresponding electronic data storage. The electronic data storage does not have to be part of the grinding machine itself within the scope of the present invention. In such a data memory, the set parameter sets can be stored and used again at a later time.

Preferably, the grinding machine has a detection device, by which an achieved grinding result can be detected. This detection device is for example a camera and is preferably directed to the ground surface. It is therefore arranged in the feed direction behind the actual grinding unit, so the brushes and brush holders. The detection device is preferably connected to an electronic data processing device. The acquired data, for example recorded images, are transmitted to the data processing device and further processed therein. By way of example, the data processing device is set up to compare the data of the achieved grinding result with the expected grinding result. If a deviation determined is greater than a predetermined tolerance value, the electronic data processing device can change at least one parameter, for example the brush rotation speed, the carrier rotation speed, a contact pressure and / or the feed rate, and thus iteratively achieve this Adjust the grinding result to the expected grinding result. The result of the comparison can therefore be used as control parameter or control parameter.

• Figur 1 - die schematische dreidimensionale Ansicht eines Teils einer Schleifmaschine gemäß einem ersten Ausführungsbeispiel der vorliegenden Erfindung,
• Figur 2 - die schematische Darstellung von Bürstenträgern und Schleifbürsten,
• Figur 3 - die schematische Darstellungen von Wirkungskreisen,
• Figur 4 - die schematische Darstellung eines Antriebs für eine Schleifmaschine,
• Figur 5 - die schematische Darstellung von Wirkkreisen gemäß einem anderen Ausführungsbeispiel der vorliegenden Erfindung,
• Figur 6 - eine weitere Ansicht von Wirkkreisen gemäß einem weiteren Ausführungsbeispiel der vorliegenden Erfindung und
• Figur 7 - die schematische Darstellung von zwei unterschiedlichen Steuermodi.

With the aid of the accompanying drawings, some embodiments of the present invention will be explained in more detail below. It shows:

• FIG. 1 the schematic three-dimensional view of a part of a grinding machine according to a first embodiment of the present invention,
• FIG. 2 the schematic representation of brush holders and brushes,
• FIG. 3 - the schematic representations of spheres of action,
• FIG. 4 the schematic representation of a drive for a grinding machine,
• FIG. 5 the schematic representation of active circuits according to another embodiment of the present invention,
• FIG. 6 - Another view of active circuits according to another embodiment of the present invention and
• FIG. 7 - The schematic representation of two different control modes.

FIG. 1 schematically shows a part of a grinding machine according to a first embodiment of the present invention. It has a plurality of brushes 2, of which three are arranged on a brush holder 4 in the illustrated embodiment. Each of the brush holder 4 is rotatably supported about a support rotation axis 6. For this purpose, a carrier drive 8, for example in the form of an electric motor, through which the carrier rotation axes 6 and thus the brush holder 4 are set in rotation via a first transmission belt 10 can. By deflection rollers 12 it is ensured that the carrier wheels 14 surrounding the respective carrier rotation axes 6 are surrounded by the first transmission belt 10 with sufficient tension.

The grinding machine according to FIG. 1 also has a brush drive 16, which may also be in the form of an electric motor. Through him, the individual brushes 2 are driven by a second transmission belt 18, not shown. For this purpose, in the exemplary embodiment shown, each brush holder 4 has a third transmission belt 20, by means of which the movement transmitted via the second transmission belt 18 is transmitted to the individual brushes 2 of a respective brush holder 4.

FIG. 1 also shows an output device 17, which is for example a monitor. Preferably, an input device, for example in the form of a keyboard, may also be included so that the desired values for the parameters to be set can be entered. The output device 17 is coupled to a schematically illustrated electronic data processing device 19, which is connected to the brush drive 16 and the carrier drive 8.

FIG. 2 shows the schematic representation of a similar embodiment of the grinding machine. One recognizes us in FIG. 1 four brush holder 4, on each of which three brushes 2 are arranged. The individual brushes 2 are presently designed as cup brushes, so that the bristles 22 of the individual grinding breasts 2 are located only in their edge region. Of course, disc brushes or other brush shapes are conceivable.

It can also be seen the carrier rotation axes 6. They are surrounded by a respective first brush gear 24 in which they can rotate freely. The first brush gears 24 are connected to each other via the second transmission belt 18. Via a drive gear 26 is one of the in FIG. 2 not shown brush drive 16 torque applied to the second transmission belt 18 and thus transferred to the first brush gears 24. These are coupled to a second brush gear 28 which meshes with the third transmission belt 20 and transmits the movement to the actual abrasive brushes 20. Because the Abrasive brushes 2 are driven by the brush drive 16 and the brush holder 4 by the carrier drive 8, the respective rotational speed can be set independently. In the exemplary embodiment shown, however, it is not possible to set different carrier rotation speeds for different brush holders 4 or different brush rotation speeds for different brushes 2.

The four brush holders 4 in FIG. 1 and 2 are arranged in a transverse direction. Perpendicular to the feed direction, ie in the embodiments shown from bottom to top or from top to bottom. One recognizes in FIG. 2 in that the individual brush holders 4 are arranged offset in this feed direction, which is indicated by the arrow 30.

The individual working groups of the brushes are in FIG. 3 shown. It can be seen schematically the brush holder 4, on each of which three brushes 2 are located. They stand beyond the circumference of the brush holder 4 addition. Now, if the brush holder 4 is moved along the brush rotation direction shown by the arrow 32, the brushes 2 are rotated and the outermost edge of the brush 2 describes the shown in dotted line active circuit 34. At the same time, the individual brushes 2 in the direction shown by the arrow 36 Bürstenrotationsrichtung emotional.

Since the individual brush carriers 4 are arranged offset in the feed direction, which is again represented by the arrow 30, there is no place on a surface of a workpiece that is not processed by a grinding brush 2, although the individual active circles 34 do not overlap each other ,

FIG. 4 shows schematically the structure of the different drives. It can be seen two brushes 2, which are arranged on a brush holder 4. This is driven by a drive shaft 38 at the upper end of which is the carrier gear 14, which is in engagement with the first transmission belt 10. One recognizes one of the already in FIG. 1 shown pulleys 12th

Around the drive shaft 38, there is disposed the first brush gear 24 engaged with the second transmission belt 18. It extends into FIG. 2 down and is connected to the second brush gear 28, which is in engagement with the third transmission belt 20 and transmits the movement to the actual grinding brush 2.

FIG. 5 shows one of the FIG. 3 similar representation. It can be seen three brush holder 4, on each of which three brushes 2 are arranged. These also protrude beyond the outer periphery of the brush holder 4 and are rotated along the brush rotation direction indicated by the arrow 36. Unlike in FIG. 3 However, the individual brush holder 4 are arranged eccentrically about the support rotation axis 6 shown embodiment. To this carrier rotation axis 6, the individual brush holder are rotated in the direction shown by the arrow 32. As a result, each of the brushes 2 describes a circular path around the support rotation axis 6, but the individual distances of the brushes from the support rotation axis 6 are of different sizes, so that different functional circuits 34 result for different brushes. Due to the eccentricity of the suspension of the brush holder 4 about the support rotation axis 6, the individual active circuits 34 overlap, without it being possible for collisions between the individual brush holders 4 or the brushes 2. Therefore, it is in the in FIG. 5 shown embodiment not necessary to arrange the brush holder 4 offset along the feed direction.

FIG. 6 shows a further embodiment of the different arrangements. It can be seen three brush holder 4, on each of which three abrasive brushes 2 are arranged, which are rotated about the brush rotation direction shown by the arrow 36. The individual brush holder 4 are not offset from each other, but positioned on a common carrier beam 40. This is arranged at its two ends to a respective rotation disk 42, wherein the attachment 44 is carried out eccentrically. If the rotary disks 42 are set in motion along the direction of rotation 46, a pivoting or tumbling movement of the support beam 40 occurs. In a preferred embodiment, the rotational speed with which the rotary disks 42 rotate can also be adjusted.

FIG. 7 shows that in principle two different modes of rotation can be selected. In the example below FIG. 7 rotate the two rotation discs 42, the in FIG. 7 are shown only schematically, in the same direction. The movement of the brush holder 4, not shown, and the brushes 2 is superimposed in this way, an additional rotational movement, since the support beam 40 without its orientation to change, is moved. In the upper part of the FIG. 7 On the other hand, the two rotary disks 42 rotate in different directions of rotation. This results in a wobbling movement of the support beam 40, which is superimposed on the movement of the brushes 2 and the brush holder 4. Advantageously, consequently, the direction of rotation of at least one of the two rotating disks can also be adjusted so as to be able to achieve further grinding patterns.

LIST OF REFERENCE NUMBERS

2

brush

4

brush carrier

6

Carrier rotation axis

8th

carrier drive

10

first transmission belt

12

idler pulley

14

carrier gear

16

brush drive

17

output device

18

second transmission belt

19

Data processing device

20

third transmission belt

22

bristles

24

first brush gear

26

drive gear

28

second brush gear

30

arrow

32

arrow

34

pitch circle

36

arrow

38

drive shaft

40

beams

Claims (12)

Grinding machine for grinding a surface of an object, the grinding machine a. a plurality of abrasive brushes (2), i. which are rotatably mounted about a brush rotation axis, b. at least one brush holder (4), i. on which at least one of the abrasive brushes (2) is mounted and the ii. about a support rotation axis (6) is rotatably mounted, and c. a conveying device for conveying the object at a feed rate through the grinding machine, characterized in that the grinding machine comprises an input device and an output device, wherein
a brush rotation speed about the brush rotation axis and / or a carrier rotation speed about the support rotation axis (6) and / or the feed speed can be set by the input device, and
An expected grinding result can be output by the output device. Grinding machine according to claim 1, characterized in that the output device has a display device on which the expected grinding result can be displayed. Grinding machine according to claim 1 or 2, characterized in that the grinding machine has an electrical control, in particular a microprocessor, which is set up to calculate the expected grinding result by means of the set parameters. Grinding machine according to one of the preceding claims, characterized in that the grinding machine comprises a plurality of brush holders (4), for which different carrier rotation speeds are adjustable by the input device, wherein the brush holder are preferably rotatable in the same direction. Grinding machine according to claim 4, characterized in that the brush holder (4) are arranged offset in the feed direction. Grinding machine according to claim 4 or 5, characterized in that the brush holder (4) are arranged such that active circles of the brushes overlap. Grinding machine according to one of the preceding claims, characterized in that at least one brush holder (4) is mounted eccentrically. Grinding machine according to claim 7, characterized in that a degree of eccentricity is adjustable by the input device. Grinding machine according to one of the preceding claims, characterized in that the input device has an interface to a data connection, in particular a Bluetooth interface, a USB interface, an Internet connection or a wireless interface, for example a radio or WLAN interface Grinding machine according to one of the preceding claims, characterized in that the input device has an operating element by means of which the parameters can be set manually. Grinding machine according to one of the preceding claims, characterized in that the grinding machine has an electronic data memory in which set parameters can be stored. Grinding machine according to one of the preceding claims, characterized in that it comprises a detection device, in particular a camera, by which an achieved grinding result on the surface of the object after grinding can be detected, the grinding machine preferably having an electronic data processing device which is set up to compare the detected grinding result with the expected grinding result and to use the result of this comparison as control parameter or control parameter.

Images