WO2012107453A1

WO2012107453A1 - Pipe belt sanding unit

Info

Publication number: WO2012107453A1
Application number: PCT/EP2012/052065
Authority: WO
Inventors: Pham Cong; Rainer Kuehfuss; Stefan Schwarz; Arthur Rehm; Thomas Stenzel
Original assignee: Metabowerke Gmbh
Priority date: 2011-02-07
Filing date: 2012-02-07
Publication date: 2012-08-16
Also published as: DE202011002462U1; DE102011076003A1; EP2673115B1; EP2673115A1

Abstract

The invention relates to a pipe belt sanding unit, comprising an output roller (20, 20') for driving a continuous sanding belt (100), two deflecting wheels (5, 5', 6, 6') for deflecting the continuous sanding belt (100) that are arranged at a distance from the output roller (20, 20'), each deflecting wheel being arranged on a respective arm (3, 3', 3'', 3'' ', 4, 4'), wherein at least one of the two arms (3, 3', 3'', 3'' ') is designed as a movable arm and wherein a lever (1, 1') is present for moving the movable arm (3, 3', 3'', 3'' '). A handle (2, 2') is present, toward which the lever (1, 1') can be moved, wherein the handle (2, 2') is arranged relative to the lever (1, 1') in such a way that the lever (1, 1') and the handle (2, 2') can be jointly clasped by a hand of a user.

Description

Pipe belt grinding unit

The invention relates to a pipe belt grinding unit for

Grinding pipes.

Such pipe belt grinding units are commonly used to machine the cylinder jacket surface of pipes. Due to the special geometry of the too

machined object are conventional parts

The challenge consists essentially in bringing the grinding element, so usually the grinding belt of a belt grinder, with as evenly distributed over the surface fitting pressure with the surface to be ground in contact by a uniform material removal and thus to achieve a satisfactory grinding result,

From the prior art, in particular from the European patent EP 1 112 811 Bl a pipe belt grinder is known in which a grinding belt guided over two deflecting wheels and located between the ümlenkrädern

Section of the abrasive belt is used for grinding. In this case, according to the teaching of EP 1 112 811 Bl for adaptation to the geometry of the object to be ground, ie in particular to the radius of the pipe to be ground, the two

Deflecting wheels arranged with a variable distance, In the cited document, this is achieved in that one of the deflection wheels is arranged on a pivot arm, wherein the Swivel arm an outwardly projecting boom with a

Has handle, with which the pivot arm and the deflecting wheel arranged on it can be brought to the second guide wheel,

Although this solution according to the prior art allows the setting of the distance of the deflection wheels to each other within certain limits, but suffers from a bad

Handleability of the resulting device. Thus, on the one hand, the operator must press the entire device in the direction of the workpiece and, on the other hand, hold the device with one hand on its housing, wherein he additionally with the other hand said boom to

Setting the respective radius must move. Overall, this results in a little ergonomic handling of said device, In addition, the device does not allow processing of pipes such as, handrails, which are mounted close to a wall.

The object of the present invention is to provide the device known from the prior art with regard to

Improve ergonomics and manageability and allow work close to the wall.

This object is achieved by the device having the features specified in the independent claim 1. The

Subclaims relate to advantageous developments and embodiments of the invention, The pipe belt grinding unit according to the invention shows an output roller for driving an endless abrasive belt and two spaced ümlenkräder to the output roller ülenenkräder for deflecting the endless abrasive belt. The two ümlenkräder are each arranged on an arm, at least one of the two arms is designed as a movable arm. To the

Moving the movable arm, there is a lever. Movable against the said lever is a handle, wherein the handle is arranged opposite the lever in such a way that the lever and the handle can be gripped together by one hand of an operator. In other words, the operator when using the erf indungsgemäßen device with one hand grasp the pipe belt grinder on the housing and with the other hand include both lever and handle and by bringing together the lever and handle, in particular by closing the respective hand a leading the one To reach deflecting wheel against the other, so that the pipe belt sander in the direction of processing smaller

Tube radii can be adjusted. By the relative

Mobility of lever and handle each other and the

Being able to support the hand in question on the handle makes it possible to adapt to smaller pipe radii without changing the balance of power between the two arms of the operator. The distance between the two ümlenkräder to each other and the

Contact pressure of the grinding belt on the usually

Cylindrical outer surface of the pipe to be machined can thus be done completely independently, which is a

significant improvement in terms of ergonomics and not least in terms of occupational safety,

In order to enable the described embracing of lever and handle, in particular a distance of the respective outer sides of the lever and handle in the range of about 100 mm is advantageous.

In a first embodiment of the invention is the

movable arm designed as a swivel arm.

The lever may in particular be designed as a two-sided lever whose load arm acts on the swivel arm for swiveling and whose power arm can be grasped by the hand of the operator. The action of the load arm of the lever on the pivot arm can be effected, for example, by the fact that the load arm acts on it by means of a roller which can roll on the pivot arm. Likewise, the load arm by means of a sliding bearing, which is formed slidably on the pivot arm, act on this. In the described variant, therefore, the lever is not with the swivel arm

Connected, but acts only mitteis one

Relative movement of lever and swivel arm on the swivel arm. In particular, this variant opens up the possibility that, for example, the roller or even the sliding bearing can be guided on the pivoting arm along a predetermined trajectory curve, as a result of which a desired one may be required

Force history can be set. Basically, however, too a solid connection between the load and the arm arm conceivable.

In a further variant of the invention, the load arm of the lever is articulated to the power arm of another two-sided lever, wherein the deflecting wheel is arranged on the load arm of the further lever. In other words, in this case, the swivel arm itself is designed as a further two-sided lever, on whose power arm the first lever, which is actuated by the hand of the operator, acts. This variant is characterized by the fact that, for example, due to the geometric design and the relative

Arrangement of the two mentioned two-sided lever to each other a desired force curve is adjustable. The articulated connection of the load arm of the first with the power arm of the second lever can be achieved in particular by the fact that a driving axis is arranged on one of the two lever arms and this driving axis in one at a

Lever arm of the second lever arranged hole engages.

To set a restoring force by which a certain basic tension of the abrasive belt is achieved in the non-actuated state of the lever, may also be present a leg spring whose first leg is on the

Mitnähmeachse and the second leg on a

Abutment supports. The abutment can be fixed

in particular in a carrier unit of the grinding andes

be arranged. In an alternative embodiment of the invention, the movable arm is designed as a displaceable arm, thus essentially executing a linear movement or a movement along a predetermined trajectory.

In this case, the displaceable arm by means of at least one

Leadership in a leadership, especially one

Guide hole, be guided. The shape of the

Guide long hole thus affects the movement of the sliding arm. Thus, to a certain extent certain movements along desired trajectories of the

Movement of the arm to be realized.

Due to the fact that the displaceable arm has a toothed slide guided in a guide, in particular a slot, the teeth of which mesh with a toothed wheel, a translational movement of the movable arm can likewise be achieved. The gear is to set over a formed on the load arm of a two-sided lever sprocket during a movement of the power arm of the two-sided lever in rotation and thus moves the tooth slide in the guide.

The flexibility of the device according to the invention with regard to adaptation to different pipe radii can be further increased by the fact that that of the two arms, which is not designed as a movable arm, to

Adaptation to the radius of the pipe to be ground

slidably disposed in a slot guide. As a result, the range may be that in which the distance between the two Deflection wheels can be adjusted to each other by the operation of the pivot arm can be adjusted within certain limits.

Characterized in that the pipe belt grinding unit a

Quick clamping device for connecting the carrier unit is arranged with a housing of a basic unit, a simple attachment of the pipe belt grinding unit can be achieved

The sliding arm can be next to the one described above

Variant also be guided by a linear guide.

By using the pipe belt grinding unit according to the invention, a complete pipe belt sander, for example, can thereby be obtained

be provided that the pipe belt grinding unit is arranged on the housing of an angle grinder; the

Grinding wheel of the angle grinder would then through the

Output roller of the pipe belt grinding unit replaced. A realization of a pipe belt grinder as a separate device, which is fixedly provided with the pipe belt grinding unit, is conceivable.

The invention will be explained in more detail with reference to the drawing.

It shows; FIG. 1 shows a first embodiment of the invention in FIG

a basic position in the front view

(perspective);

FIG. 2 shows the situation shown in FIG

Rear view;

Fig. 3, the first embodiment of the invention in one

Working position in front view;

Figure 4 shows the said embodiment in working position in rear view.

Fig. 5 shows another embodiment of the invention;

Fig. 6 shows an alternative embodiment of the invention;

Fig. 7, the variant shown in Figure 6 in

Working position;

Fig. 8 to 11 show a further variant of the invention with a displaceable arm;

12 to 15, a first alternative embodiment of a

sliding arm;

16 and 17, a second alternative embodiment of a

movable arm. FIG. 1 shows a non-designated pipe belt grinding unit with a carrier unit 7, which is mounted on a housing of a

Basic unit, which contains a drive unit, can be arranged. In this case, the carrier unit 7 can be attached to different basic devices. Conceivable as basic equipment are, for example, angle grinders, in which the grinding wheel is replaced by an output roller 20, on which the grinding belt 100 is guided. On the support unit 7, the arms 4 and 3 are arranged, wherein the arm 3 is designed as a pivoting arm. Both arms 3 and 4 are provided with the guide wheels 5 and 6, on which the abrasive belt 100 rolls. A relative movement of the pivot arm 3 in the direction of the arm 4 and thus of the ümlenkrades 6 can now be achieved in that the pivot arm 3, which in the present

Example as a two-sided lever with power arm. 31 and load arm 32 is formed, about the pivot point 50 is moved. For this purpose, the lever arm 1, which is likewise designed as a two-sided lever, engages on the power arm 31 of the pivoting arm 3, which lever can be turned about the pivot point 40. The power arm 12 of the lever 1 shows the driving axis 9, which engages in the bore 10 and thus ensures a hinged connection between the two levers 1 and 3. The leg spring 8 is supported

on the one hand on the driving axle 9 and on the other hand on the abutment 60 from which fixed to the carrier unit 7

connected is. Here, the leg spring 8 serves to ensure a certain bias of the abrasive belt 100 in the basic position of the device according to the invention. Now, if the lever 1 moves in the direction of the handle 2, this is

Movement through the described mechanism to that effect implemented that the deflection wheel 5 moves in the direction of the deflection wheel 6 and thus an adjustment in the direction of smaller pipe diameter can be achieved. The

corresponding working position is shown in FIG.

Also clearly visible from Figure 1 is that the handle 2, which is fixedly arranged on the support unit 7, is located at a distance from the lever 1, that both the lever 1 and the handle 2 by the fingers of one hand easily gripped can be and thus a simple

Actuation of the device according to the invention is possible. Also clearly visible from the drawing, there in particular from Figure 2 is the slot bearing of the guide wheel 6 in the support unit 7. The slot is formed substantially as a slot 80 in the support unit 7, through which the arm 4 is screwed by means of the screw 85. A slight loosening of the screw 85 causes the arm 4 in the

Slot 80 can be moved in the direction of the arm 3; in extreme cases, the arm 4 can be completely removed through the slot 80, which can be used, for example, to insert a new deflecting wheel or an alternative arm. In addition, Figures 2 and 4 show in the figures

I and 3 shown embodiment in rear view, The lever 1 and the handle 2 need not necessarily be configured as shown symmetrically with respect to their to be gripped by the operator's hand areas; also a one-sided attachment of the part to be gripped of the lever 1 on the power arm

II and a corresponding design of the handle 2 are conceivable. FIG. 5 shows a further embodiment of the invention.

In this case, the lever 1 'is also designed as a two-sided lever, wherein the power arm 11' of the lever 1 * relative to the fixed to the support unit 7 'arranged handle 2' can be moved. It can, as already at the front

described, the two levers 1 'and 2' are embraced by the hand of an operator, resulting in the desired

Relative movement easily accomplish. The load arm. 12 'of the lever 1' is angled and has at its end on the roller 110, which rolls on the pivot arm 3 'and pushes it upon actuation of the lever 1' in the direction of the second guide wheel 6 ', wherein also an adaptation to lower pipe radii can be made. The roller 110 may alternatively not by a in the figure

In the absence of a force exerted by an operator force on the lever 1 ', the grinding belt by the compression spring 200, on the one hand on the support unit 7 · and on the other hand on the Swivel arm 3 'supports, preloaded.

It is very clear in the figures that it is possible by the inventive design of lever 1 or 1 'and handle 2 or 2', the inventive

Pipe belt grinding unit in areas with limited to

Available space such. B. when grinding

mounted handrails in the area between wall and handrail. Figure 6 shows a variant of the presented in Figure 1 to 4 embodiment of the invention. Corresponding parts are provided here with the same reference numerals. The embodiment shown in Figure 6 differs from the embodiment of Figures 1 to 4, characterized in that the load arm 12 of the lever 1 with the power arm 31 of the pivot arm 3 is not connected via a slot connection, but via an intermediate piece 21. The intermediate piece 21 is in each case connected via a joint (not designated) to the load arm 12 or the power arm 31. An advantage of this variant is that in the present case no pin under the influence of

Sliding friction slides in a slot, but that to

Movement of the swing arm 3 only rotational movements must be made to the said joints.

FIG. 7 shows the variant shown in FIG

Working position.

In the figures 8 to 11 is another variant of

Pipe belt grinding unit shown in which no

Swiveling of an arm takes place, but rather the

displaceable arm 3 "can be moved by means of a linear movement toward and away from the deflection wheel 6. For this purpose, the arm 3" is guided by means of two guide rollers 51 and 52 in the guide slot 53 in such a way that it moves in the direction described above of the deflection wheel 6 and can run away from this. Thus, in the example shown, the arm 3 "does not execute a pivoting movement about an axis, but rather a linear movement Guide slot 53 drawn with a straight course; a course along a deviating from the straight line curve is conceivable, by means of which a desired movement of the deflection wheel 5 along a predetermined trajectory

can be realized.

Figure 9 shows a rear view of the presented in Figure 8 embodiment, well recognizable is the leg spring 8, which "with one of its legs on the arm 3" and thus exerts a restoring force on the arm 3 ", which pushes it away from the ümlenkrad 6 .

Figures 10 and 11 show the embodiment of Figures 8 and 9 in the working position.

A first alternative embodiment of the invention is shown in Figure 12, in which also the arm 3 "'which points the steering wheel 5 is not pivoted, but instead moved linearly, in particular displaced Slot 54 guided

Zahnschlitten 33, the toothing with a gear 34 in

Intervention is. The toothed wheel 34 is rotated by a movement of the power arm 11 'in the direction of the handle 2 "via a toothed ring 13 formed on the load arm 12' of the two-sided lever 1 *, so that the arm 3"'with the eccentric wheel 5 located in it Direction of the guide wheel 6 moves and thus adaptation to smaller pipe radii is possible. The arranged in the slot 54 compression spring 55 exercises it the arm 3 "'from a restoring force, which is directed away from the guide wheel 5.

FIG. 13 shows a rear view of that presented in FIG

embodiment; Figures 14 and 15 show the

Embodiment of Figures 12 and 13 in Arbeitssteliung.

16 shows a second alternative embodiment of the invention, in which also the arm 3 "which shows the deflecting wheel 5 is not pivoted, but rather moved linearly, in particular displaced, The arm 3" is displaced by means of a linear guide 56 led, for example in the region of a recess of

Carrier unit 7 is connected to the same. The arm 3 "with the deflection wheel 5 located thereon is moved in the direction of the deflection wheel 6, so that an adaptation to smaller

Tube radii is possible. The linear guide 56 shows a carriage sliding in a rail, wherein the rail can be connected to the carrier unit and the carriage to the arm 3 * * {or vice versa). The carriage can be partially surrounded by the rail, so that the

Carriage is movable only in the desired direction and in particular falling out of the carriage can be avoided from the rail. Both the sled and the

Rail may be overmoulded with a linear polymer to improve its sliding and / or wear properties. Such linear guides are also offered under the type designation DryLin by igus GmbH.

Furthermore, in the embodiment shown here as Scne11scan a eccentric 300 to the

Carrier unit 7 is arranged. By means of the eccentric clamp 300, it is possible for the carrier unit 7 to be attached to a housing of a basic unit which contains a drive unit,

comparatively easy and quick to assemble.

FIG. 17 shows the variant of FIG. 16, wherein the arm 3 ' ^{1 is} linearly displaced so that smaller pipe diameters can also be processed. The leg spring 8 is in this case in the tensioned state and presses against each

Abstützlager, Alternatively, the arm 3 '' or a component attached to this be designed such that a leg of the leg spring 8 in a groove-shaped recess of the arm 3 '* or the component which is connected to the arm 3' ¹ , runs and thereby in the tensioned state a

Restoring force on the arm 3 ' ¹ exercises.

Claims

claims

1. Rohrbandschleifeinheit with an output roller (20,20 '} to drive a continuous abrasive belt {100}, two to the driven roller (20, 20') arranged spaced

Deflection wheels (5, 5 ', 6, 6') for deflecting the

Endless grinding (100), each on one arm

(3, 3 ¹ , 3 ", 3"', 4, 4') are arranged, wherein at least one of the two arms (3, 3 ', 3 ", 3"') is designed as a movable arm and wherein a lever ( 1,1 ') for moving the movable arm (3, 3', 3 ", 3"') is present, which means that a handle

(2, 2 ') is provided, against which the lever (1,1') is movable and wherein the handle (2,2 ') opposite the lever (1,1'} is arranged in such a way that the lever

(1,1 '} and the handle (2,2') from one hand of a

Operator can be embraced together.

2. pipe strap assembly according to claim 1,

That is, the movable arm (3, 3 ') is designed as a pivoting arm.

3. pipe belt grinding unit according to claim 2,

That is, the lever (1, 1 ') is designed as a two-sided lever whose load arm (12, 12') acts on the swivel arm (3, 3 ') for

Swiveling acts and its force arm (11,11 ') can be detected by the hand of the operator.

4. pipe belt grinding unit according to claim 3,

d a d u r c h e c i n e s that the

Load arm (12 ') of the lever (1') by means of a roller (110) which is formed on the pivot arm (3 ¹ ) unrolled, on the pivot arm (3 ') acts.

5. pipe belt grinding unit according to claim 3,

d a d u r c h e c i n e s that the

Load arm (12 ') of the lever (1') by means of a sliding bearing, which is formed on the pivot arm (3 ¹ ) slidably acting on the pivot arm (3 "),

6. pipe belt grinding unit according to claim 3,

d a d u r c h e c i n e s that the

Load arm (12) of the lever (1) with the power arm {31} of another two-sided lever (3) is pivotally connected, wherein on the load arm (32) of the further lever (3) a

Deflecting wheel (5} is arranged,

7. pipe belt grinding unit according to claim 6,

characterized in that the articulated connection of the load arm (12) of the first with the power arm (31) of the second lever (3) by a on a lever (1) arranged driving axis (9) which engages in a bore of the other lever is formed ,

8. pipe belt grinding unit according to claim 7,

characterized in that around the fulcrum (40) of the first lever (1) a leg spring (8) is arranged, the first leg is supported on the driving axis (9) and the second leg on an abutment (60),

9. pipe belt grinding unit according to claim I,

The mobile arm can be used as a sliding arm

(3 '', 3 "') is formed.

10. pipe belt grinding unit according to claim 9,

That is, the displaceable arm (3 ") can be moved by means of at least one of them

Guide roller (51, 52) in a guide, in particular a guide slot (53) is guided.

11. pipe belt grinding unit according to claim 9,

That is, that the displaceable arm (3 '' ') has one in a guide,

in particular a slot (54) guided toothed slide (33), the toothing with a gear (34) is engaged.

12. pipe belt grinding unit according to claim 11,

d a d u r c h e c i n e s that the

Gear (34) via one on the load arm {12 ') of a

two-sided lever (1 ¹ ) formed sprocket (13} during a movement of the power arm (11 ') of the two-sided

Lever (1 ') is set in rotation. -ISIS. Pipe belt grinding unit according to one of claims 1 to 12, since it is noteworthy that the one (4) of the two arms, which is not designed as a movable arm, is slidably disposed in a slot guide (80) for adaptation to the radius of the pipe to be ground ,

14, pipe belt grinding unit according to one of claims 1 to 13, since it is c e c e s e s that these a quick-release device (300) for connecting the carrier unit (7) with a housing of a basic unit, which contains a drive unit, is arranged.

15. The pipe belt grinding unit according to claim 1, wherein the displaceable arm. {3) by means of a linear guide (56) is guided.