DK2897774T3

DK2897774T3 - Device for surface treatment of floors and coatings

Info

Publication number: DK2897774T3
Application number: DK13818704.2T
Authority: DK
Inventors: Steffen Widemann
Original assignee: Steffen Widemann
Priority date: 2013-12-12
Filing date: 2013-12-12
Publication date: 2017-01-16
Also published as: EP2897774B1; PT2897774T; RS55445B1; ES2606686T3; WO2015086081A1; SI2897774T1; HUE031324T2; PL2897774T3; EP2897774A1

Description

The invention concerns a device for machining the surfaces of floors and ground surfaces and for mounting on a driven mounting disk of a floor and ground surface grinding machine in accordance with the preamble of patent claim 1.

Such a device is shown by EP 0067402.

It is known for floor and ground surface grinding machines the mounting disks of which are fitted with grinding medium carriers or disks set with diamond to be used for grinding the surfaces of floors, for example, marble, granite or natural stone floors, and for removing adhesive residues and synthetic-resin coatings from floors or for machining the surfaces of roads. Good results have been achieved recently by fitting the mounting disk with contoured grinding rollers known as “bush hammers” that are rotatably mounted on a roller fixture and are fastened to the underside of the mounting disk facing the floor. Such bush hammer disks are distributed by, for example, the Italian company Klindex S.r.l at the Internet address www.klindex.it. The grinding rollers here are fitted with hollow-cylindrical, hardened grinding elements. A rolling bearing sleeve is pressed into the grinding roller inside. The grinding roller so formed is bolted to an angle piece by means of a bolt which runs through the angle piece and at the same time forms the roller axle, the angle piece in turn being bolted onto the mounting disk.

The disadvantage of the aforesaid device is that the grinding rollers, which are subject to great wear, are very complicated and can be replaced only by using tools. The grinding rollers here have only a short service life, particularly also because the fine dust set up when machining the floor finds its way into and so impairs the bearings. This fine dust prevents the rollers from running concentrically, and this in turn often causes the roller axles to bend the inner bolts out of shape, making it difficult for them to be demounted.

It is here that the invention is intended to help. The invention is based on the problem of providing a device for machining floor and ground surfaces and for mounting on a driven mounting disk of a floor and ground surface grinding machine and having a grinding roller that can be easily replaced without using tools and where fine dust is prevented from finding its way into the bearings. In accordance with the invention, this purpose is fulfilled by the features described in the characterising section of claim 1.

In the invention a device is created for machining floor and ground surfaces and for mounting on a driven mounting disk of a floor and ground surface grinding machine a grinding roller that can be easily replaced without using tools and where fine dust is prevented from finding its way into the bearings and impairing them. Because the roller fixture incorporates a housing in which the shaft is rotatably mounted, the bearings can be enclosed dirttightly.

Because the means for detachably fastening a grinding roller without using tools comprise at least one and preferably three and very preferably four locking elements that can be at least partly moved radially out of the lateral surface of the shaft and engage in a recess in the grinding roller, the grinding roller can be axially fastened onto the shaft inside the grinding roller. Because of the internal disposition of the fastening impairment through fine dust is avoided, thus making replacement of a worn roller easier.

In a further embodiment of the invention one or more of the locking elements is formed by a ball that is disposed in a radial hole in the shaft which radial hole opens into an axial hole made in the middle of the shaft in which axial hole an ejection pin by which the ball can be moved out through the radial hole is axially movably disposed.

This enables the locking element constructed in the form of a ball to be easily locked in the recess in the grinding roller. The radial hole advantageously has at least partly a smaller diameter than the ball so that the ball is completely prevented from passing through and out of the radial hole. The same effect can be obtained by providing for radially projectile pins to be fitted on the shaft.

In a further development of the invention the ejection pin incorporates at least one reduced-diameter portion into which one or more balls can be at least partly moved radially. This enables one or more balls to be released by axial movement of the ejection pin, thus enabling the grinding roller to be easily drawn from the shaft. The one or more balls that are used for axial fastening and are located in the recess that is disposed at least partly inside the grinding roller can then move back into the reduced-diameter portion of the ejection pin.

In a further embodiment of the invention the ejection pin is spring-mounted in the axial blind hole from which the ejection pin projects at one end. By this the ejection pin is pretensioned in an end position in which the one or more balls are pressed outwards through the radial hole in the shaft. To release the axial fastening, the ejection pin can be moved axially against spring pressure so that the one or more balls can move back into the reduced-diameter portion of the ejection pin, so enabling the grinding roller to be easily drawn off the shaft.

In a further development of the invention the recess disposed in the grinding roll to enable one or more locking elements to engage is formed by a groove running all the way round. By this the locking elements can be radially positioned as desired, thus enabling the grinding roller to be mounted more easily on the shaft.

The means for detachably fastening a grinding roller without using tools comprise a number of driving elements that engage in a corresponding recess in the grinding roller.

By this a positive connection is made between the shaft and the grinding head, so that the grinding head is also radially fastened on the shaft. The shaft incorporates an increased-diameter portion opposite its free end by which a shoulder is formed on which are disposed two or more and preferably three axially projecting, preferably cylindrical driving elements that engage in corresponding recesses in the grinding roller. Here a raised portion running all the way round and fully enclosing the increased-diameter portion of the shaft is advantageously formed on the end face of the grinding roller. By this fine dust is prevented from finding its way into the positive connection between the grinding roller and the shaft. In a further development of the invention a driving element is additionally formed by an out-of-round and preferably polygonal outer contour of an end portion of the shaft which polygonal outer contour engages in a shaft fixture on a grinding roller corresponding to the polygonal outer contour.

The housing is advantageously constructed to fully enclose the bearing part of the shaft dusttightly. By this the running properties of the shaft bearings are protected against impairment.

The shaft fixture of the grinding roller is preferably formed by a blind hole. This enables a tool fixture closed at one end to be achieved, thus helping to prevent fine dust from finding its way in when the floor or ground is being machined.

In an embodiment of the invention the shaft fixture incorporates an out-of-round cross-section constructed preferably in the form of a polygon. This enables a positive connection between the grinding roller and a corresponding shaft to be achieved, thus also achieving a radial fastening.

Provided on the front face of the grinding roller next to the shaft fixture are preferably also three holes to receive driving elements disposed on a shaft to be mounted, thus enabling a corresponding positive fit to be achieved.

In a further embodiment of the invention an axially projecting raised portion running all the way round and enclosing the shaft fixture is formed on the front face. By this fine dust is prevented from finding its way in between the shaft fixture and a shaft mounted in the shaft fixture.

The present invention further comprises a mounting disk for a floor and ground surface grinding machine that is provided on one side at least with three devices according to the invention.

Other further-developments and embodiments of the invention are set out in the other subclaims.

One example embodiment of the invention is shown in the drawings and is described in detail in the following. The following is shown in the drawings:

Figure 1 schematic exploded view of a device for machining floors and for mounting on a driven mounting disk of a floor and ground surface grinding machine;

Figure 2 view of the shaft of the device shown in Fig. 1. a) side view; b) plan view.

Figure 3 view of the housing of the device shown in Fig. 1. a) front view; b) sectional view; c) back view; d) bottom view;

Figure 4 view of the housing cover of the housing shown in figure 3. a) front view b) side view;

Figure 5 schematic view of the grinding roller of the device shown in Fig. 1. a) plan view. b) view of section A-A and

Figure 6 view of a mounting disk for a floor and ground surface grinding machine as shown in Fig. 1 with a device fastened to it.

The device chosen as an example embodiment of a device for machining floor and ground surfaces and for mounting on a driven mounting disk of a floor and ground surface grinding machine consists essentially of a housing 1, in which a shaft 2 that is fitted with a grinding roller 3 is rotatably mounted.

The housing 1 is constructed essentially box-shaped with a top surface sloped like a saddleback roof. The housing is provided with a hole 11 in which a raised portion 12 running all the way round is formed about two-thirds of the way along the hole, the hole 11 being constructed with an increased diameter behind the raised portion 12. This increased-diameter area 111 serves to receive sealing rings 6 to seal the housing 1 against dust. Inserted into the hole 11 on the side of the raised portion 12 opposite the increased-diameter area 111 are two grooved ball bearings 4 disposed one behind the other for rotatably mounting the shaft 2. The housing 1 is closed at the end by a cover 13 that is provided with a hole 14 corresponding to the hole 11 in the housing 1. Next to the hole 14 an annular shoulder 15 that rests inside against the increased-diameter area 111 of the hole 11 is formed on the cover 13. The cover 13 is bolted on with hexagon-head bolts 8 fitted with washers 81 and inserted into holes 16 made in the cover 13 and tapped holes 17 disposed in the housing 1. Disposed on the underside opposite the saddleback-roof-shaped upper side of the housing 1 are four tapped blind holes 18 for fastening to a mounting disk 5. The shaft 2 is constructed as a hollow shaft and provided at its end with four radial holes 21 set 90 degrees apart to receive one ball 22 each. The holes 21 open into the axial hole 20 running through the centre of the shaft 2. An increased-diameter portion 23 that is provided with three holes 24 set 120 degrees apart to receive cylindrically formed dowel pins 25 is formed next to the holes 21 on the shaft 2. Abutting the increased-diameter portion 23 is a reduced-diameter shoulder 26 that is constructed with a diameter greater than the shaft 2. The shaft 2 incorporates at its end opposite the holes 21 a threaded portion 27 provided with an outside screw thread. An ejection pin 28 is inserted into the axial hole 20 in the shaft 2. The ejection pin 28 is so pretensioned in the axial hole 20 by means of a spring (not shown) disposed in the axial hole 20 that movement of the ejection pin 28 takes place in the direction of the holes 21 against spring tension. Furthermore, a groove (not shown) having a width approximately equal to the cross-section of the ball 22 is made all the way round the outside of the ejection pin. This groove (not shown) is positioned so that, when the ejection pin 28 is pushed in, the balls 22 can move back into this groove (not shown).

The shaft 2 so constructed is inserted into the hole 11 of the housing 1, the increased-diameter portion 23 being made to rest via the sealing rings 6 against the raised portion 12 running all the way round. The shaft 2 here is rotatably mounted in the grooved ball bearings 4 through which the shaft 2 runs and is fastened axially by two mutually locking hexagon-head nuts 7 screwed behind a shim 71 onto the threaded portion 27 of the shaft 2.

The grinding roller 3 is constructed essentially cylindrical. On its lateral surface 31 the grinding roller 3 is provided with grinding contours (not shown). A shaft fixture 32 in the form of a blind hole in the inner wall of which a groove 33 running all the way round approximately in the middle is disposed is fitted into the grinding roller 3. Disposed next to the shaft fixture 32 in the front face of the grinding roller 3 are three blind holes 34 set 120 degrees apart to receive a dowel pin 25. In extension of the lateral surface of the grinding roller an axially projecting portion 35 enclosing the blind holes 34 is also formed on the front face.

The grinding roller 3 is fastened onto the shaft 2, the end of the shaft 2 provided with holes 21 being inserted into the shaft fixture 32. When the shaft 2 is inserted into the shaft fixture 32, the ejection pin 28 is pushed towards the grinding roller 3, causing the balls 22 disposed in the holes 21 to move back into the groove (not shown) in the ejection pin 28. After the shaft 2 is inserted into the shaft fixture 32 the ejection pin 28 is moved back into its starting position by the restoring forces of the spring (not shown), at the same time causing the balls 22 to be pressed out of the groove (not shown) of the ejection pin through the holes 21 and into the groove 33 running all the way round in the shaft fixture 32 and causing the shaft 2 to be axially fastened in the shaft fixture 32. At the same time, when the grinding roller 3 is pushed onto the shaft 2, the dowel pins 25 located in the hole 24 in the increased-diameter portion 23 of the shaft 2 are moved into the blind holes 24 in the grinding roller 3, thus forming a positive connection between the grinding roller 3 and the shaft 2. The grinding roller 3 is thus positively connected to the shaft 2.

To replace a worn grinding roller 3, the ejection pin 28 is pressed towards the grinding roller 3, causing the groove (not shown) made in the ejection pin 28 to be moved level with the balls 22. The grinding roller 3 can then be drawn off the shaft 2, the dowel pins 25 being moved out of the blind holes 34 and the balls 22 forced back into the groove (not shown) running all the way round in the ejection pin 28. A new grinding roller 3 can then be mounted onto the shaft 2 in the way described in the foregoing and, after the ejection pin 28 has been shifted into its starting position, locked with the shaft 2 by means of the balls. In the mounted position the increased-diameter portion 23 of the shaft 2 is enclosed by the raised portion 35 running all the way round the grinding roller 3, thus providing a good seal against fine dust.

The device so constructed is fastened with bolts through the tapped blind holes 18 disposed in the housing to a mounting disk 5 for a floor and ground surface grinding machine, as shown, for example, in Figure 6. The mounting disk 5 incorporates in the example embodiment a clover-leaf-shaped recess 51 for positive connection to a drive for the floor and ground surface grinding machine (not shown). Set 120 degrees apart on either side of this recess 51 are four holes 52 forfastening by means of bolts (not shown) the housing 1 of the device according to the invention.

Claims

Apparatus for surface processing of floors and coatings, for mounting on a driven holding disc (5) on a floor grinding machine, comprising a roller holder with a rotatably mounted profiled milling roller (3), the roller holder comprising a shaft (2) on which the profiled milling roller ( 3) is disposed, the roller holder comprising a housing (1) in which the shaft (2) is rotatably mounted, said shaft (2) being provided with means for toolless releasable fastening of a milling roller (3), characterized in that the means for toolless releasable attachment of a milling roller (3) comprises at least one radially at least partially projecting locking element (22) movable on the shaft surface of the axis (2) to a recess (33) provided in the milling roller (3). and at least one carrier engaging in a corresponding recess in the milling roller (3), the shaft (2) comprising a section (23) which is enlarged in diameter relative to the free end of the shaft (2), by helper p, of which a ledge is formed on which at least two axially projecting carriers (25) are arranged, which engage in corresponding recesses (34) in the milling roller (3).

Device according to claim 1, characterized in that the at least one locking element is formed by a ball (22) arranged in a radial bore (21) in the shaft (2), which radial bore (21) opens into an axial bore (20) centered in the shaft in which an excavator pin (28) is disposed axially movable, through which the ball (22) can be moved outwardly through the radial bore (21), the radial bore (21) being preferably at least in a certain area has a smaller diameter than the ball (22).

Device according to claim 2, characterized in that the trigger pin (28) comprises at least one diameter-reduced section into which the at least one ball (22) can move at least partially radially.

Device according to claim 2 or 3, characterized in that the trigger pin (28) is biased in the axial bore (20) via a spring from which the axial bore (20) protrudes at the end side.

Device according to claim 3 or 4, characterized in that the recess (33) provided in the milling roller (3) for engagement with the at least one locking element (22) is formed by a circular groove (33) and / or the area of reduced diameter in the trigger pin (28) is formed by a circumferential groove provided therein.

Device according to any one of the preceding claims, characterized in that the carrier is formed of a non-round, preferably multi-angled, outer contour on an end side area of the shaft (2) which engages a corresponding shaft holder in the milling roller (3). ).

Device according to any one of the preceding claims, characterized in that a circumferential projection (35) is formed on the end roller (3) which encloses the diameter-increasing section (23) of the shaft (2).

Device according to any one of the preceding claims, characterized in that the housing (1) in the region of the bearing shaft (2) is designed to be dust-tight enclosing.