EP3170621A1 - Device for rotating processing of surfaces - Google Patents

Abstract

A device (1) for rotating machining or for grinding or polishing floors has an operating unit (2), a chassis (3), a drive unit (4) with a drive motor and a grinding unit (5). The grinding unit (5) has a rotating sanding pad (50) which can be driven by a drive shaft of the drive motor. At one of the surface to be machined surface facing the grinding plate (50) at least three rotatably mounted grinding wheels (51, 52, 53) with grinding wheel shafts (56, 57, 58) are arranged, which by a rotating drive belt (61) can be driven. The drive belt (61) is guided over a fixed central disk (60) arranged between the grinding wheel shafts (56, 57, 58) and abuts against it at at least one point. The drive belt (61) biases a polygon about the grinding wheel shafts (56, 57, 58), which comprises all the grinding wheel shafts (56, 57, 58) in equal parts.

Description

The invention relates to a device for the rotary machining of surfaces, in particular for grinding or polishing of floors.

The DE 196 49 282 C1 describes a device for grinding and polishing floors and surfaces with motor-driven grinding wheels. The device comprises a handle element, a chassis with wheels, a housing with a motor drive and a plate with several grinding wheels. The plate is connected via a gearbox in operative connection with a motor shaft. The axes of the grinding wheels are mounted radially displaceable and are pressed by springs inwards. To a drive-facing portion of the axes gears are rotatably arranged. On the inside, the housing has a gear rim corresponding to the gears. When the plate is rotated by the drive, the axes are pushed outwards and the gears engage in the ring gear. By combing the gears with the ring gear rotate the grinding wheels against the direction of rotation of the plate.

Task and solution

The object of the invention is to provide a device of the type mentioned above, which avoids the disadvantages of the prior art and in particular has the improved properties with respect to a fatigue-free application by reducing the rotating masses and using vibration-resistant drive means.

This object is achieved by a device having the features of claim 1. Advantageous and preferred embodiments of the invention are the subject of further claims and are explained in more detail below. The wording of the claims is incorporated herein by express reference. Some of the following, but not exhaustive enumerated features and properties are sometimes described only once, but can apply independently and independently in any combination. Furthermore, the order of the listed features is not binding, but rather may be changed and combined according to an optimized device.

The device has an operating unit, a chassis, a drive unit with drive motor and drive shaft and a grinding unit. The grinding unit has a rotating sanding pad which can be driven by the drive shaft. At one of the surface to be machined surface facing the grinding plate at least three rotatably mounted grinding wheels are arranged with grinding wheel shafts, which are driven by a rotating drive belt. The drive belt is guided over a fixed central disk arranged between the grinding wheel shafts and abuts against it at at least one point.

According to the invention, the drive belt clamps a polygon about the grinding wheel shafts, which comprises all grinding wheel shafts in equal parts. In this case, advantageously, the grinding wheel shafts form the corners of the polygon or span the polygon.

The fact that the central disk is firmly connected to the housing of the drive motor and rotate only the sanding disc, the drive belt and the grinding wheels, a rotating mass is reduced. A reduction of the rotating mass reduces vibrations and leads to a fatigue-free operation of the device.

In an embodiment of the invention, all grinding wheels rotate in the same direction, in particular in opposite directions to the grinding plate. Since the sanding pad is rotated by the drive motor, the grinding wheel shafts arranged on it are taken in the same direction. The rotating grinding wheel shafts orbit the fixed central disk. The drive belt spans the central disk and the grinding wheel shafts. The grinding wheel shafts partially lift the drive belt from the central disk when the center disk is surrounded. Advantageously, the drive belt does not rotate relative to the central disk, so the sense of rotation of the grinding wheels is reversed when the drive belt rolls off. Advantageously, this results in that the direction of rotation reversal is brought about without a further rotating element, which reduces mass forces acting in the device.

In a further embodiment of the invention, a force transmission between the central disk, the drive belt and the grinding wheel shafts is produced in a positive and / or non-positive or frictionally engaged manner. The drive belt can be designed as a form-fitting toothed belt or as a non-positive flat, round or V-belt, ie drive by means of frictional engagement. Drive belts reduce vibrations, require little maintenance and require no lubrication. Compared to chains or gearboxes, they have a much lower weight. Drive belts run quietly and act as positive or frictionally engaged overload protection. In addition, belt drives are cheaper than chain or gear transmission.

In a further embodiment of the invention, the drive belt is a flat belt or V-belt, which bears against the central disk. An embodiment of the drive belt as a flat belt acts as overload protection. Unevenness of the ground, which could result in blocking of the grinding wheel, is compensated by slippage of the flat belt and does not adversely affect the device. In addition, a low wrap angle and thus a reduced size is possible with a use of non-positive drive belt.

In another embodiment of the invention, the drive belt is a toothed belt whose teeth engage in a toothing of the central disc. Timing belts have a good synchronization, are slip-free and usually require a lower belt tension than non-positive belt drives such as flat belts. This results in lower bearing loads and increased life of bearings.

In a further embodiment of the invention, the drive shaft is positively connected to the sanding pad, preferably by means of a plate closure, in particular by means of a bayonet closure. For simple and tool-free assembly and disassembly, the drive shaft can be positively connected to the sanding pad. The drive shaft and the sanding pad can be connected to one another by a wedge connection, a single or multi-start thread or advantageously by a bayonet lock. Also positive connections via splined or splined shafts are possible, as well as a connection with a groove and a feather key.

In a further embodiment of the invention, a positive connection between the drive shaft and the sanding pad acts in a direction of rotation of the drive shaft. The positive connection is designed such that the direction of rotation of the drive motor is at the same time a locking direction of the positive connection or the connection between the drive shaft and the sanding pad. Thus, by an operation of the device, the connection is made and secured during that time. Advantageously, the correctly mounted connection can not be released automatically during operation of the device. Such a connection can be realized for example with a single or multi-start thread, a wedge connection or a bayonet lock. In addition, a positive connection in the axial direction of the drive shaft act.

In a further embodiment of the invention, the central disc engages over a flange of the sanding plate. An outer diameter of the rotating flange of the grinding disc is smaller than an inner diameter of the fixed central disc. When mounting the sanding pad on the device, a locking element penetrates the distal end of a drive shaft the flange of the sanding plate and engages in a corresponding plate closure of the sanding plate. The inner diameter of the central disc and the outer diameter of the flange of the grinding plate can cooperate as a guide and thus facilitate the assembly of the grinding plate on the device or on the drive shaft.

In a further embodiment of the invention, the central disk is attached to a cover of the drive motor. To reduce components, the central disk can be attached directly to the cover of the drive motor. Advantageously, existing threads can be used for the connection already in the cover, which serve to connect two cover parts.

In a further embodiment of the invention, the central disk over at least one straight polygonal side by 1 mm to 10 mm, advantageously such that the drive belt with force or pressure is applied to the central disk when it is inserted therein. The central disk may be geometrically designed such that it protrudes beyond at least one rectilinear polygonal side beyond it in its state without inserted central disk and thus causes an increased belt tension and thus an improved power transmission. The central disk can advantageously be designed circular, alternatively deviate from a circular shape.

In yet another embodiment of the invention, the central disk over all rectilinear polygonal sides equally over in such a way that the drive belt rests at several points with force or pressure on the central disk. The central disk can be designed such that in each case such a number of sections of the drive belt rests against it at the same time or engages in it as the polygon has corners.

In a further embodiment of the invention, the drive belt and the central disk is associated with a pressing device. The pressing device can exert additional pressure on the drive belt, advantageously in the direction of the grinding wheel shafts and / or the central disk, so that a slipping or slipping of the drive belt can be better or completely prevented with insufficient drive belt tension. The pressing device can be used both with toothed belts and with flat belts.

In a further embodiment of the invention, the pressing device has pressure rollers which act on the drive belt in the pressure position. During operation of the device, the pressure rollers of the stationary pressure device can thus roll over the rotating drive belt and exert pressure on it.

In a further embodiment of the invention, the pressing device can be latched in at least one pressing position. In order to transfer the pressing device from a rest position, in which it exerts no pressure on the drive belt, in such a pressing position, the pressing device rotatably mounted about a rotation axis of the grinding plate can be rotated such that the pressure rollers approximate the grinding wheel shafts in a rotational direction of the pressing device , preferably all pressure rollers evenly. In this position, the pressing device can be locked, for example by means of locking bolts, which can advantageously be done automatically or automatically. Likewise, a screw or any other type of attachment in the Andrückposition is possible.

These and other features will become apparent from the claims and from the description and drawings, wherein the individual features each alone or more in form and sub-combination in one embodiment of the invention and in other areas be realized and advantageous and protectable Represent embodiments for which protection is claimed here. The subdivision of the application into individual sections and intermediate headings does not limit the statements made thereunder in their generality.

Brief description of the drawings

Fig. 1

zeigt eine Gesamtdarstellung einer erfindungsgemäßen Vorrichtung zur rotierenden Bearbeitung von Flächen,

Fig. 2

zeigt eine Schleifeinheit einer erfindungsgemäßen Vorrichtung mit einem Flachriemen in Draufsicht,

Fig. 3

zeigt eine Schleifeinheit einer erfindungsgemäßen Vorrichtung mit einem Zahnriemen und einer Andrückvorrichtung in einer Draufsicht und

Fig. 4

zeigt eine Schrägdarstellung einer Schleifeinheit einer erfindungsgemäßen Vorrichtung.

Embodiments of the invention are shown schematically in the drawings and are explained in more detail below. In the drawings show:

Fig. 1

shows an overall view of a device according to the invention for the rotary machining of surfaces,

Fig. 2

shows a grinding unit of a device according to the invention with a flat belt in plan view,

Fig. 3

shows a grinding unit of a device according to the invention with a toothed belt and a pressing device in a plan view and

Fig. 4

shows an oblique view of a grinding unit of a device according to the invention.

Detailed description of the drawings

Fig. 1 shows a device 1 for rotating machining of surfaces, in particular parquet. The device 1 has an operating unit 2, a chassis 3, a drive unit 4 and a grinding unit 5. The operating unit 2 has a handle area and an extension for connection to the chassis 3. Rollers for moving the device 1 are arranged on the chassis 3. On the chassis 3, the grinding unit 5 is further attached. The grinding unit 5 is partially covered by a housing cover 6. On one of the surface to be machined facing the housing cover 6, a suction device 7 is arranged, which protrudes from the housing cover to the outside and represents a kind of flexible ring as a kind of apron, which ultimately rests on the ground. Sanding dust can be extracted by means of a connected vacuum cleaner. This corresponds to the state of the art.

The Fig. 2 . 3 and 4 show details of the grinding unit 5. The grinding unit 5 has in its the surface to be machined facing area, which thus points downward, a sanding pad 50. On the sanding pad 50 here three grinding wheels 51, 52, 53 of the surface to be machined facing down. The grinding wheels 51, 52, 53 have on a side facing away from the surface to be machined grinding wheel shafts 56, 57, 58, with which they are rotatably mounted on the sanding pad 50. Between the grinding wheel shafts 56, 57, 58, a plate lock 55 is centrally arranged, which is surrounded by a flange of the grinding plate 50, hereinafter called plate flange 54.

To the grinding wheel shafts 56, 57, 58, a drive belt 61 is wound, which spans or forms such a triangle. The drive belt 61 is without additional tension through a central disk 60 as a solid line in Fig. 2 shown. In Fig. 2 Moreover, the drive pulley 61 stretched around the center disk 60, which is shown in dotted lines, is shown dotted. As in Fig. 4 shown, the central disk 60 is fixed to a cover flange 62, which is not connected to the cover of the Fig. 2 shown drive 4 is connected. In the centrally arranged plate lock 55 engages as a bayonet closure, not shown closure element on a drive shaft of the drive unit 4, which corresponds to the shape of the bayonet closure. By a rotation of the closure element, not shown, in a conventional direction of rotation of the drive shaft, the closure element in the plate closure 55 of the plate flange 54 is secured in a form-fitting manner. In Fig. 3 In addition, a pressing device 63 with three pressure rollers 64, 65, 66 is shown. The pressure rollers 64, 65, 66 halve in a rest position in each case the angle between two grinding wheel shafts 56, 57, 58 and are arranged outside the polyhedra spanned by the drive belt 61. The pressure rollers 64, 65, 66 are arranged on arms, which converge centrally in a circular disk, not shown. The annular disk is rotatably mounted on an underside of the grinding plate 50.

If the drive shaft of the drive unit 4 rotates, its closure element also rotates and the plate closure 55 is carried along by the closure element. Correspondingly also rotates the sanding pad 50 in the direction of rotation of the drive shaft. The grinding wheels 51, 52, 53 are carried by the sanding pad 50 in the direction of rotation of the drive shaft. The attached to the fixed cover flange 62 central disk 60 does not rotate. The drive belt 61, which is placed around the grinding wheel shafts 56, 57, 58 rotating with the sanding pad 50 and around the fixed central disk 60, is revolving around the sanding disk shafts 56, 57, 58 from the central disk 60 when the sanding disk 50 rotates but still on. By a tension or a toothing on the fixed central disk 60, the drive belt 61 is prevented from rotating relative to the central disk 60. Thus, a reversal of the rotational direction of the grinding wheel shafts 56, 57, 58 is brought about, which roll on the drive belt 61 fixed in this respect. The three areas in which the drive belt 61 rests against the central disk 60, run around accordingly. In the Fig. 3 shown pressing device 63 is locked in a pressing position. The rotatably mounted pressure rollers 64, 65, 66 of the pressing device 63 exert constant pressure on the drive belt 61 in this pressure position and press it against the central disk 60.

In the illustrated embodiment is in Fig. 3 a first axis of rotation A in the center of the grinding plate 50 is arranged. The sanding pad 50 rotates driven by the drive shaft about this axis and the grinding wheels 51, 52, 53 revolve around the rotation axis A. In addition, each grinding wheel 51, 52, 53 rotates about its own axis of rotation B, C, D against the direction of rotation of the sanding pad 50, the rotating objects B, C, D pass through the grinding wheel shafts 56, 57, 58.

In order to release the sanding pad 50 together with the grinding wheels 51, 52, 53 from the device 1, a locking of the pressing device 63 is released by an operator by hand. The pressing device 63 is rotated by the operator about the axis of rotation A in a rest position in which the pressure rollers are each approximately between two grinding wheel shafts 56, 57, 58. The sanding pad 50 is rotated by the operator in the direction of rotation of the drive 4 about the axis of rotation A, preferably by hand. In the illustrated embodiment, a rotation angle to a release of the connection between the sanding pad 50 and drive 4 is about 60 °. Three lugs of the locking element, not shown, of the drive shaft of the drive 4 can now be removed by recesses from a groove of the plate closure 55.

In order to fasten the sanding pad 50 to the drive 4, the sanding pad 50 is attached to the device 1 in such a way that the lugs of the locking element of the drive 4 dive into the recesses of the disk lock 55. By turning the sanding pad 50 um About 60 ° counter to the direction of rotation of the drive shaft of the drive 4, the connection is positively secured. The pressing device 63 is rotated by the operator about the rotation axis A such that the pressure rollers 64, 65, 66 approximate the grinding wheels 56, 57, 58 in the direction of rotation and pressure is generated by the pressure rollers 64, 65, 66 on the drive belt 61. In this pressing position, the pressing device 63 is locked and thus the device 1 is ready for operation.

Claims (14)

Device (1) for the rotary machining of surfaces, the device (1) comprising: an operating unit (2), a chassis (3), - A drive unit (4) with a drive motor and a grinding unit (5), - wherein the grinding unit (5) has a rotating grinding plate (50) which can be driven by a drive shaft of the drive motor, wherein at least three rotatably mounted grinding wheels (51, 52, 53) with grinding wheel shafts (56, 57, 58) are arranged on one of the surface to be machined facing surface of the grinding disc (50), which are drivable by a rotating drive belt (61), - wherein the drive belt (61) via a between the grinding wheel shafts (56, 57, 58) arranged fixed central disc (60) is guided and at least one point abuts it, characterized in that
the drive belt (61) spans a polygon around the grinding wheel shafts (56, 57, 58), which comprises all the grinding wheel shafts (56, 57, 58) in equal parts. Device (1) according to claim 1, characterized in that all grinding wheels (51, 52, 53) rotate in the same direction, in particular in opposite directions to the sanding pad (50). Device (1) according to claim 1 or 2, characterized in that a force transmission between the central disc (60), the drive belt (61) and the grinding wheel shafts (56, 57, 58) is produced positively and / or non-positively or frictionally. Device (1) according to claim 3, characterized in that the drive belt (61) is a flat belt, which rests against the central disc (60). Device (1) according to claim 3, characterized in that the drive belt (61) is a toothed belt whose teeth engage in a toothing of the central disc (60). Device (1) according to one of the preceding claims, characterized in that the drive shaft is positively connected to the sanding pad (50), preferably by means of a plate closure (55), in particular by means of a bayonet closure. Device (1) according to claim 6, characterized in that a positive connection between the drive shaft and the sanding pad (50) acts in a direction of rotation of the drive shaft. Device (1) according to one of the preceding claims, characterized in that the central disc (60) engages over a flange of the grinding plate (50). Device (1) according to one of the preceding claims, characterized in that the central disc (60) is fixed to a cover of the drive motor. Device (1) according to one of the preceding claims, characterized in that the central disc (60) projects beyond at least one rectilinear polygonal side of the drive belt (61) by 1 mm to 10 mm, such that the drive belt (61) bears against the central disc ( 60) is applied. Device (1) according to one of the preceding claims, characterized in that the central disc (60) over all rectilinear polygons equally protrudes such that the drive belt (61) with force on the central disc (60). Device (1) according to one of the preceding claims, characterized in that the drive belt (61) and the central disk (54) is associated with a pressing device (63). Device (1) according to claim 12, characterized in that the pressing device (63) can be latched in at least one pressing position. Device (1) according to claim 12 or 13, characterized in that the pressing device (63) has pressure rollers (64, 65, 66) which act on the drive belt (61).

Images