EP2987596B1 - Impact tool and device for removing materials containing stone - Google Patents

Description

The invention relates to a striking tool according to the preamble of claim 1.

Milling machines or rotor hammers are known from the prior art, which serve to remove soils, roads or masonry from rock-based building materials, such as concrete, asphalt, etc.

From the DE 197 54 371 C1 For example, there is known a rock milling machine having a rotary milling tool with milling bits distributed about its circumference. By means of pendulums arranged inside the tool, a striking effect is produced on the cutting tools and transferred to the substrate which is to be processed.

The EP 2 418 059 A1 describes a device for processing concrete surfaces. On a percussion head a plurality of striking nails is arranged, which are suspended freely swinging.

FR 1 210 450 A discloses a striking tool according to the preamble of claim 1.

A disadvantage of the aforementioned prior art is that these removal devices do not run around and achieve only an uneven removal of surfaces of said building materials.

Based on this prior art, it is an object of the present invention to provide an improved impact tool for a device for the removal of rock-containing building materials, whereby a uniform removal of the rock-containing surface can be achieved.

This object is achieved by a striking tool having the features of claim 1.

The further object of providing a device for removing rock-containing building materials or surfaces of such building materials whose operation is simple and their operation is inexpensive and reliable, is achieved by the device with the features of the dependent claim 7 achieved. Preferred embodiments of the impact tool and the device are set forth in the subclaims.

An impact tool as a device for removing rock-containing building materials according to a first embodiment of the invention comprises a striking roller which can be rotated about its longitudinal axis with a predetermined direction of rotation. Further, the impact roller on two or more impactor, which are arranged eccentrically along the circumference of the impact roller with respect to the longitudinal axis and oscillating. According to the invention, the impact roller has a recess along its periphery for each impactor, in which a bearing end of the impactor is received, wherein the recess has walls which limit a pendulum angle of the impactor.

"End of storage" means in the sense of the invention that a striker is suspended at a certain point and that a section is defined around this point, on which the striker is movably mounted, that is mounted. The impactor is formed substantially elongated rectangular and has in its arrangement within the recess a bearing end, with which he is just suspended pendulum. The bearing end may have a radius of curvature which is dimensioned somewhat smaller than the radius of the curvature section, so that the impactor can oscillate sufficiently. The shape of the impactor may be straight or conical towards its free end. The bearing end is opposite to a free end as the "effect", with which the impactor can impinge on the surface to be machined of the rock-containing building material and the edges are rounded. As a result, a uniform removal of a rock-containing building material can be effected.
Advantageously, given by the recess according to the invention a guide for the impactor in the direction of rotation of the impact roller, whereby a uniform removal of the rock-containing building material can be achieved by means of this tool.
"Gestelnshaltig" For the purposes of the invention means various hard building materials such as various types of concrete, asphalt, solid rock and other materials and materials. In the building materials, various types of rock of any grain size, for example. Fine, in the form of sand or coarse, in the form of pebbles. The size of the grain can be between a few mm to several cm. Both natural rock and artificially produced stone or rock conglomerates can be present in the building material.

A first wall and a second wall of the recess are connected by a curved portion. The curvature section is axially oriented with respect to the axis of rotation of the impact roller. In this case, the recess opens against the direction of rotation of the impact roller, wherein an opening angle of the recess corresponds to the pendulum angle of the impactor.

Furthermore, the first wall of the recess forms an impact stop for the impact body and the second wall a guide stop. The guide stop is directed in the direction of rotation of the impactor and takes during the rotation of the impact roller with the impact body. If the impactor meets the rock-containing building material, the pendulum action of the impactor is limited by the impact stop and a power transmission to the surface is significantly improved in comparison to the prior art. A knockback of the impactor or a rollover of it, so that the impact roller starts to double, can be prevented by limiting the pendulum angle. In a cross section through the impact roller, the walls of the recess of an extension of their lines can be described as secants of the circular cross section of the impactor.

In embodiments of the invention, the pendulum angle may be in a range of 10 ° to 45 °. Preferably, there is a very good power transmission when the pendulum angle is 20 °. The pendulum angle should in any case be such that the recess can be so large that the impactor can perform a pendulum motion and thus sufficient space for commuting is available. This ensures that the impactor has sufficient freedom of movement and optimal power transmission of the impactor can be done on the rocky building material. Since the impact of the impactor takes place at a certain angle, a particularly smooth running of the tool and thus a more uniform removal can be achieved.

The recess has predetermined dimensions relative to the impactor body. Preferably, a first distance of the impactor from a vertex of the curvature section to a lateral surface of the impact roller three quarters of an overall length correspond to the impactor. However, the first route can also be longer or shorter in an alternative embodiment. In any case, the first distance forms the dimension of the first wall of the recess, so the impact stop.

The second distance of the impactor from the vertex of the curvature portion to an outer surface of the impact roller may be selected to be half the total length of the impactor or less. Again, in an alternative embodiment, the second distance may be longer or shorter than the aforementioned dimension. The second distance forms the dimension of the second distance corresponding to the first distance and defines the dimension of the guide stop.

Preferably, the second distance will always be shorter than the first distance, so that the concept of the active or guide stop for the impactor body can be implemented. The lateral surface of the impact roller substantially corresponds to its outer surface or its outer periphery.

In order to achieve a uniform removal of rocky building materials, it can be provided that the impactor consists at least partially or completely of a hard metal. These show a very high hardness, wear resistance and hot hardness. As a rule, sintered carbide carbides, for example of tungsten carbide, can also be used based on titanium or tantalum. Depending on which material is selected, the life of the impactor can be changed. Also, a corresponding carbide can be selected for different floors to be removed.

According to a further embodiment, the recess may be rounded at both transitions of the walls of the recess in the lateral surface of the impact roller. Alternatively, only one of the first or second walls may have a rounded edge. This avoids that the impactor can break off when hitting the walls. The life of the impactor is significantly extended.

In one development of the invention, it can be provided that a longitudinal extension of the recess can extend axially along the impact roller in one or more predetermined sections. Alternatively, the recess or the plurality of recesses may extend over the entire length of the impact roller. As a result, different length dimensions of the impact roller are possible, it can be realized both very short impact rollers and very long impact rollers.

Preferably, a separate recess may be provided for each impactor, so that in an embodiment with a plurality of impactors, the impact roller in cross section receives a substantially sawtooth-shaped contour. It is particularly advantageous that the impactors can be suspended individually or along a suitable suspension device, such as a rod or individual riveting, threaded. If one of the impactors have been removed or damaged, it is possible that not the complete roll body, but only individual impactors must be replaced.

An inventive device for removing rock-containing building materials in one embodiment has a housing and a rotatable impact tool. The impact tool is an inventive impact tool of the aforementioned type and embodiments. In this case, a drive device for the impact tool is arranged in the housing according to the invention.

To propel the device forward, a transport motor, such as an electric or conventional gasoline engine, may be provided to automatically move the device. In addition to the feed of the device wheels are provided in a rear area, which are driven by the motor and thus can set the device in motion. The device may also have a handle for a manual feed of the device.

In a further development of the invention it can be provided that the device has a spray unit that sprays water or other liquids onto the surface to be removed. Immediately after impact of the impactors can take place a suction of the removal, so that the working space within the housing and around the device remains largely clean. This avoids the formation of excessive dust and reduces health risks for people who need to work with the machine. Also, the complete device can be used without loss of power in a water bath.

Advantageously, a thinner removal by faster removal, ie a faster feed done. Furthermore, no adjustment is necessary because the impact the impactor is always the same. Depending on the impactors used or the removal nails, a removal of up to 20 mm can take place in one work train. Depending on the used material of the impactor, the removal can also be higher. Each striker can also be compensated by this amount. The impactor strikes the ground during rotation of the impact roller and rotates past the pendulum angle of approximately 20 ° counter to the direction of advance of the device. Even if due to each impact and the material wear each percussion body is also removed, the same removal can be achieved, since with buckling of the impactor body a constant change in length takes place.

Regardless of the removal results always the same impact force for the impact body. For controlled milling, the impactors had to be readjusted so far - this is no longer necessary, so that due to the low material wear and the ability to remove the impactor in an amount corresponding to the total removal of a soil in one step, the life of the impact roller as a whole can be further increased.

By the centrifugal force in about 600-800 revolutions / min can be achieved a high impact force and thus a longer milling time of the tool can be achieved. In order to obtain a possibility for different types of concrete or different building materials to make the removal even more precise and uniform, it can be provided that the device has a speed control, whereby the number of revolutions per minute of the impact roller can be adjusted on the device. This speed setting can be used to achieve a metered and controlled serve even in a water bath. For this purpose, the speed can be set below 600 revolutions / min.

Furthermore, the speed control can be used to clean the impact roller by using the handle raised the wheels and the impactors so that they can not touch the ground. Due to the centrifugal force, dirt particles and parts of the removed floor covering, which adhere to the impactor, are simply thrown out and the impact roller is cleaned in this way. Replacement of the impact roller due to contamination and encrustations is therefore not necessary. The life of the impact roller can be increased even further.

By the aforementioned embodiments and alternatives can be a device provide with an impact tool that can achieve a particularly gentle and uniform removal of the aforementioned building materials.

Other embodiments as well as some of the advantages associated with these and other embodiments will become apparent and better understood by the following detailed description with reference to the accompanying drawings. The figures are merely a schematic representation of an embodiment of the invention.

Fig. 1

eine Schnittansicht eines erfindungsgemäßen Schlagwerkzeugs, und

Fig. 2

eine Detailansicht eines pendelnd aufgehängten Schlagkörpers.

In Fig. 1 ist ein erfindungsgemäßes Schlagwerkzeug 1 mit einer Schlagwalze 2 dargestellt, wobei die Schlagwalze 2 um einen Drehabschnitt 3 mit einer mittleren Längsachse, die mit der Längsachse der Schlagwalze 2 übereinstimmt, rotieren kann. Eine Drehrichtung B ist durch Pfeile in der Fig. 1 angegeben. Ferner ist eine Vorschubrichtung A bestimmt, in der die Schlagwalze 2 bewegt werden kann, sodass ein Abtrag eines gesteinshaltigen Baustoffes, hier einer Asphaltoberfläche 8, stattfindet. Über eine Befestigungsvorrichtung 3a ist die Schlagwalze 2 rotierbar gelagert, wobei die Befestigungsvorrichtung eine Schraube oder eine Niete sein kann.Showing:

Fig. 1

a sectional view of a striking tool according to the invention, and

Fig. 2

a detailed view of a pendulum suspended impactor.

In Fig. 1 an impact tool 1 according to the invention is shown with a beater roller 2, wherein the beater roller 2 about a rotary section 3 with a central longitudinal axis, which coincides with the longitudinal axis of the beater roller 2, can rotate. A direction of rotation B is indicated by arrows in the Fig. 1 specified. Further, a feed direction A is determined, in which the impact roller 2 can be moved, so that a removal of a rock-containing building material, here an asphalt surface 8 takes place. About a fastening device 3a, the beater roller 2 is rotatably mounted, wherein the fastening device may be a screw or a rivet.

Further, two recesses 6 are provided along the circumference of the impact roller 2, which are arranged opposite with respect to the rotary section 3. In the recesses 6 impactor 4 are arranged pendulum mounted. The impactors 4 are formed substantially elongated rectangular, wherein a bearing end 5 defines a portion on which the impactor 4 is suspended by means of suitable holding devices rotatably suspended within the recess 6. An end facing away from the bearing end 5 is provided as a knitting end 9, whose edges are rounded. The rounded action end 9 serves to achieve a more uniform removal of the asphalt 8, which is located below the impact roller 2.

The recess 6 is essentially formed from a first wall 6a and a second wall 6b. The first wall 6a is connected to the second wall 6b via a curvature section K. The curvature section K is arranged axially in the direction of the longitudinal axis of the impact roller 2. So that the impactor 4 within the Recess 6 can oscillate sufficiently, a radius of curvature of the bearing end 5 is slightly smaller than a radius of curvature of the curvature portion K.

In Fig. 2 a region around the curvature section K is shown in detail, wherein the walls 6a, 6b limit a pendulum angle α of the impactor 4 in the manner shown there. In Fig. 1 and 2 is the pendulum angle α in the size of 20 °. But there are also larger or smaller angles possible.

The dimensions of the walls 6a, 6b can be defined as distances S1, S2: a first distance S1 is defined by a vertex SP of the curvature section K up to a lateral surface M of the impact roller 2, wherein the first distance S1 in about three quarters of the total length of the impactor 4 from the end of storage 5 to the end of action 9 means. The first wall 6a forms the so-called impact stop.

The second wall 6b is dimensioned by a second distance S2, starting from the vertex SP of the curvature section K up to the outer surface M of the impact roller 2. The second distance S2 is at most as long as half the total length of the impactor 4th

The two walls 6a, 6b, one would extend the distances S1 and S2 so that they intersect, forming an opening angle of the recess 6, which corresponds to the pendulum angle α. The second wall 6b forms a guide stop, wherein during a rotation of the impact roller 2, the impactors 4 abut by this wall 6b due to the centrifugal force and are guided in the direction of rotation B. When hitting the asphalt 8, the impactor strikes 4 with its action end 9 on the tarmac 8 and is moved against the direction of rotation B of the impact roller 2. The impactor 4 is from the first wall 6a, so the impact stop, collected and limited in its pendulum motion. As a result, the impact force of the impactor 4 can be well transferred to the asphalt 8 and depending on the speed of the impact roller 2 a defined removal can be achieved.

LIST OF REFERENCE NUMBERS

1

impact tool

2

beater roll

3

rotating portion

3a

fastening device

4

impactors

5

Bearing impactors

6

recess

6a

First wall operative stop

6b

Second wall guide stop

7

edge

8th

asphalt

9

acting

α

swing angle

A

feed direction

B

Direction of rotation of the impact roller

K

curved section

M

lateral surface

SP

vertex

S1

First route

S2

Second route

Claims (7)

1. An impact tool (1) for a device for removing materials containing stone, which has an impact roller (2), which can be rotated about its longitudinal axis in a predetermined direction of rotation, and at least two impact bodies (4), which are arranged eccentrically and pendulum-mounted along the circumference of the impact roller (2) in relation to the longitudinal axis, wherein
   the impact roller (2), along its circumference for each impact body (4), has a recess (6), in which a support end of the impact body (5) is received, wherein the recess (6) has walls (6a, 6b), which limit a pendulum angle (a) of the impact body (4),
   wherein a first wall (6a) and a second wall (6b) of the recess (6) are connected by means of a curved section (K), which is oriented axially in relation to the axis of rotation of the impact roller (2), characterised in that the first wall (6a) forms an effective stop for the impact body (4), and the second wall (6b) forms a guide stop, wherein the effective stop limits the pendulum effect of the impact body when the impact body hits the material containing stone, and
   wherein the recess (6) opens against the direction of rotation (B) of the impact roller (2) and an opening angle of the recess (6) corresponds to the pendulum angle (a) of the impact body (4).
2. The impact tool (1) according to claim 1,
   characterised in that
   the pendulum angle (a) lies in a range of between 10° and 45°, preferably at 20°.
3. The impact tool (1) according to claim 1 or 2,
   characterised in that
   a first distance (S1) of the impact body (4) from an apex (SP) of the curved section (K) to a jacket surface (M) of the impact roller (2) corresponds at least to three-quarters of a total length of the impact body (4), and a second distance (S2) of the impact body (4) from an apex (SP) of the curved section (K) to the jacket surface (M) of the impact roller (2) corresponds to maximally half of the total length of the impact body (4).
4. The impact tool (1) according to any one of claims 1 to 3,
   characterised in that
   the impact body (4) consists at least partially or completely of a hard metal.
5. The impact tool (1) according to any one of claims 1 to 4,
   characterised in that
   the transition of the first wall (6a) and/or of the second wall (6b) of the recess (6) into the jacket surface (M) of the impact roller (2) is rounded.
6. The impact tool (1) according to any one of claims 1 to 5,
   characterised in that
   a longitudinal extension of the recess (6) extends axially along the impact roller (2) into at least one predetermined section or across the total length of the impact roller (2).
7. A device for removing materials containing stone, comprising a housing and a rotatable impact tool,
   characterised in that
   the impact tool is an impact tool (1) according to any one of claims 1 to 6, and that a drive device for the impact tool (1) is arranged in the housing.

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