EP2425951B1 - Quick-change system for a chisel - Google Patents

Description

The invention relates to an exchangeable holder system comprising a base part and a removable holder designed to be received in the base part with a bit receptacle for receiving and supporting a chisel, in particular a round shank chisel. Such an exchange system is in DE 8805961 disclosed.

A common field of application of generic swap-holder systems is their use in machines for soil cultivation, especially in road and road construction. These are often machines with a driven and rotatable about a horizontal axis roller on which a variety of tillage tools, in particular chisels and especially round shank bits are arranged. Such machines are, for example, stabilizers, recyclers and road milling, in particular cold milling. In operation, the holder for receiving the chisel, in particular round shank chisel, high loads and extremely high wear exposed, on the one hand by the broken material in the milling box and on the other hand by the rotating round shank chisel, especially in the field of Meißelschaftaufnahmebohrung in the bit holder and the contact surface of a possibly existing wear plate , In addition, the chisel holder worn or destroyed during chisel breakage, chisel loss and chisel wear. In order to be able to renew the worn or destroyed components of the bit holder easily and quickly, the use of so-called exchangeable holder systems has become established.

The essential components of such a swap-holder system are a base part and a change holder connected to the base part, which is designed to receive a tool for soil preparation, for example a chisel, in particular a round shank chisel. The base part is firmly attached to the cylindrical outer surface of the milling drum, which is usually mounted horizontally and perpendicular to the working direction of a corresponding construction machine, for example by firmly welding the base part to the roller body. The base part thus represents the Anknüpfungselement the interchangeable holder system to the roller body. The base also serves to support the interchangeable holder or is designed to support the interchangeable holder. For this purpose, a change-holder holder is provided in the base part, which can be, for example, a suitable receiving bore in the usually compact base part. The change-over holder is also a comparatively compact element. The changeover holder can be mounted reversibly on the base part and has beispielswei-, se corresponding thread, Spannstift- and / or Verschraubungsbohrungen, etc. for this reason. A defective changeover holder can therefore be replaced quickly; without the base part must be separated from the roll body. The change holder is further adapted to receive the bit, in particular round shank chisel, and for this purpose has a corresponding tool holder, for example a chisel holder in the form of a cylindrical receiving channel, which is provided for receiving and supporting the chisel. Round shank bits are often mounted rotatably about their cylinder axis in the removable holder and are secured by suitable clamping means, such as a clamping sleeve, against axial displacement. The advantage of the interchangeable-holder system is basically that, in the case of a defective tool, it is possible to selectively replace the tool and / or the interchangeable holder, without the complex connection of the base part to the roller body having to be effortlessly solved and subsequently restored. From the DE 10 2005 017 760 A1 is a change-holder system is known in which the change-holder has an overhang strip and is pivoted for mounting with this over the upper edge of a groove in the base part. When changing the system of DE 88 05 961 U1 The base part has a projecting anchor body, which engages with a hood that overlaps it on the change-over holder. The post-published DE 10 2009 052 351 A1 describes a retractable into the base part change holder with a tapering in the insertion direction wedge-shaped latch and with a wedge-shaped latch receptacle in the base part. The swap system of the DE 31 17 639 A1 comprises a base part with a groove from which the changeover holder is received. Further, extending transversely to the groove walls projections are present, which engage in corresponding recesses on the counter element.

Although generic swap-holder systems have already proven themselves in principle, there is still room for improvement. This relates in particular to the replacement of the machining tool and / or the interchangeable holder and the resistance of the entire interchangeable holder system. The object of the invention is therefore to offer a swivel holder system; which allows a facilitated replacement of the change holder on the base part and at the same time has an increased resistance.

The solution of the problem is achieved with a change-holder system according to one of the independent claims. Preferred developments are specified in the dependent claims.

In a first aspect of the invention, an exchangeable holder system according to the invention comprises a base part with a change holder receptacle and a support projection and a change holder with a chisel receptacle designed for insertion into the changer receptacle, wherein the change holder has a bearing body and a radially projecting in the base part in respect of the insertion direction of the replaceable holder has in the insertion direction protruding Basisumgriff, in the retracted state, the support projection on the base part engages around. This embodiment and the developments going back to her are also referred to below as "plug-in variant".

The changeover holder is thus inserted in the insertion variant in the base part and is held by the base part. It is advantageous if the change holder in the base part of obliquely above or coarse in the direction can be inserted into the later takes place the load of the bit in the working mode. The insertion direction of the change holder in the change holder receptacle of the base part is thus preferably roughly opposite to that direction in which the inserted into the bit holder chisel protrudes in the direction of its longitudinal axis on the change holder to the outside. The bearing body usually has a shape elongated along a longitudinal axis. At least the inserted into the base part of the bearing body may for example be cylindrical or conical. The longitudinal axis of the bearing body then corresponds to the cone or the cylinder axis of this area. The insertion movement is preferably a substantially linear movement with which the change holder is inserted into the base part in its end position. In other words, the changeover holder and the base part are designed in such a way to one another that the changeover holder can be inserted into the base part. In the retracted state, the changeover holder is held by the base part and protrudes with a fitting region of the bearing body in the direction of insertion at least partially into the correspondingly formed change holder receptacle of the base part. At least with the fitting area of the changeover holder is thus on the base part in the inserted state. At the same time, the bearing body of the change holder also serves to receive and support the bit. The bit holder is therefore also part of the bearing body. The bit holder is preferably designed as a hollow cylindrical bore in which a round shank bit can be rotatably mounted. The cylinder axis of this bit holder is in the base part inserted state of the swivel holder preferably coaxial with the longitudinal axis of the change holder holder in the base part.

Another essential feature of the swap holder is also the Basisumgriff. The base gripping fulfills a support function on the one hand and a protective function on the other. The Basisumgriff is basically designed in such a way that it overlaps in the insertion direction, a part of the base part and surrounds. The encompassing takes place in such a way that the base gripping engages behind the support projection from the perspective of the longitudinal axis of the change holder like a hook. In this area, the changeover holder with its base handle further covers the base part coming from the insertion direction of the change holder and protects it from the outside. Overall, the base wrapper allows the change holder, at least in the heavily loaded condition, in addition to the base part supported and relieved in this way, for example, the bearing body of the change holder. This applies in particular to forces acting at least partially obliquely and in particular perpendicular to the insertion direction of the change holder on the bit or on the changeover holder. The Basisumgriff thus enables a particularly advantageous power consumption by the change-holder system with a force load of the change-holder system, for example, in working mode. Specifically, the base grip is a component projecting from the bearing body. Relative to the longitudinal axis of the bearing body, the base grip projects, in particular in the radial direction, over the bearing body, preferably to the underside of the base part with which the base part is fastened to the roller. In principle, the base gripping can be an independent component which is connected to the bearing body, for example via a screwed or welded connection. However, it is preferred to manufacture the change holder as a solid component, in particular as a forged or cast part, so that the bearing body and the base handle of the change holder are integrally formed. With the help of the Basisumgriffs it is possible that the change-holder is additionally secured in the inserted into the base part state in its position relative to the base part and a more favorable power consumption is obtained. Overall, the Basisumgriff allows relief in particular of the bearing body of the change holder. Due to the fact that the base grasp when inserting the replaceable holder into the replaceable holder receptacle of the base part ("insertion direction") engages or engages around the support projection, a type of positive guidance is also obtained by the base gripping and the supporting projection with which the relative positioning of the exchangeable holder is secured to the base part.

The counterpart to the Basisumgriff on the base part forms the support projection, which is part of the base part. Also, the support projection is preferably formed solid with the rest of the base part, but in principle can also be present as an independent component. The support projection is also on the outside of the base part, so that the inserted base handle of the removable holder can embrace it in the inserted state and, at least in the heavily loaded state, can be supported on this with the base gripping. Envelope herein refers to a pertinent configuration of the base gripping the interchangeable holder that the Basisumgriff is slipped over the support projection in that it shields the Basisumgriff in, relative to the longitudinal axis of the bearing body, radial direction to both sides and against the insertion direction and, as below will be explained in more detail, at least partially and in particular completely comes with this area to the plant. The base grip thus has, for example, an approximately U-shaped profile with a protruding encircling leg. Conversely, encompassing therefore does not mean that the wrap completely engages around the support projection. Surrounding refers rather to the Insertion direction of the change holder in the base part and the base gripping surrounds the support projection in such a way that the Basisumgriff by embracing the support projection allows a support of the change holder on the base part at loads in the insertion direction and / or in the radial direction to the insertion direction and / or obliquely to these directions. The Basisumgriff is further formed in such a way that it is at least partially open to the direction of insertion and can be inserted during installation in its the supporting projection encompassing position. Conversely, the support projection is to be formed on the base part in such a way that the base cover can be pushed over it in the direction of insertion in order to allow the support projection to engage around the base cover. The support projection is also preferably arranged on the base part below the changeover holder receptacle or in the region between the mounting area or bottom of the base part and the input of the change holder receptacle into which the change holder is inserted.

In the operation of generic swap-holder systems shows that especially wear due to tribocorrosion between the base and the changeover holder considerably limit the service life of such swap-holder systems. For this reason, it is advantageous if the base part and the inserted into the base part changeover holder in the inserted state are rotationally fixed to each other. In the present case, this is achieved particularly advantageously by a corresponding design of the base grip and the supporting projection, which are preferably designed in such a way to one another that the changeover holder is mounted non-rotatably on the base part. This succeeds in particular with a base gripping and a supporting projection whose contact surfaces are not coaxial to a possible axis of rotation of the exchangeable holder relative to the base part, for example about the longitudinal axis and / or the axis along the direction of insertion of the swap holder in the base part (hereinafter also referred to as insertion axis). As an alternative or in addition, it is also possible for corresponding stops, which have a one-sided or two-sided action in the direction of rotation, to be present, which are preferably arranged in the base grasp or with the corresponding opposite side in the support projection. Another alternative, for example, locking elements, such as locking lugs, etc., which protrude in the respective opposite component in the inserted state of the change holder into the base part in corresponding recesses etc.

In principle, in order to obtain the above interactions between the base grip and the supporting projection, a broad repertoire of concrete embodiments can be used. It is essential that the base grip can embrace the support projection, that the base grip can be inserted into this encompassing position, and that the base grip in the inserted state on the support projection, at least on the chisel in the working operation obliquely acting forces can support. In terms of manufacturing technology, it has turned out to be advantageous if the base grip has an angled profile. In this case, the profile designates a sectional plane through the base grasp along the insertion axis and in the direction of the board of the base grasp. In an angled profile thus meet at least two lines to each other, as is the case for example in a rectangle. Such a profile is obtained, for example, when the Basisumgriff is a wind skew to the insertion axis of the change holder arranged stop bar.

The support projection is intended essentially a Umgriffmöglichkeit for the. Provide Basisumgriff and simultaneously be suitable for power absorption, as soon as the change holder is supported with the Bäsisumgriff on the support projection. The supporting projection may in concrete terms be an area of the base part protruding counter to the insertion direction. This can for example be part of a introduced in the Baisisteil groove, wherein the Basisumgriff protrudes in this embodiment in the inserted state into the groove.

In accordance with the invention, the side or bearing surface of the support projection of the exchangeable holder facing away from the retainer holder in the insertion direction or the abutment face / abutment surface of the base gripper runs obliquely to the longitudinal axis of the retainer holder radially on the support projection of the base part in the radial direction to the longitudinal axis of the change holder receptacle. In the insertion direction in this embodiment, this side of the support projection and the longitudinal axis of the removable holder thus converge and intersect in their respective extension at an angle in the range of greater than 0 ° to 15 °, especially from 2 ° to 10 °. The angle is determined in the plane in which lies the longitudinal axis of the change holder receptacle and in which the base protrudes in the radial direction or it corresponds to the angle in the plane which is perpendicular to the axis of rotation of a milling drum with such a change holder system. The angle specification thus relates to a side-sectional plane through the interchangeable-holder system at the level of the longitudinal axis of the interchangeable holder receptacle, so that the longitudinal axis lies in the sectional plane. The contact or abutment surface of the base grip thus lies obliquely to the longitudinal axis of the bit receptacle or to the axis of rotation of the bit and intersects this longitudinal axis in a region lying in the axial direction behind the base gripping area. This angled design succeeds particularly well when the bearing body of the change holder is conical at least in the area in which it is surrounded by the changeover holder receptacle and the change-holder holder also has a conical profile. It is about that, so that the changer holder can be inserted In addition, for this embodiment, it is necessary for the insertion bevel or insertion edge on which the changeover holder is pushed into the change holder receptacle in the base part to ideally run rectilinearly in this section parallel to the side of the support projection facing away from the change holder receptacle. Also, this edge thus extends obliquely to the longitudinal axis and, preferably, parallel to the radial direction (radial direction, unless otherwise stated, refers to the longitudinal axis of the bit holder in the changeover holder) outer side of the support projection. Also suitable for this purpose is a cone-shaped design of the removable holder and the formation of the removable holder receptacle as a complementary cone-shaped bore particularly well. In this case, the cone of the interchangeable holder can be inserted into the interchangeable holder receptacle so that it slides with its lying on the side of the Basisumgriffs wall portion on the side of the side projection lying wall surface in the interior of the changeover holder along and pushed in this way in its final position becomes. The change holder can not be introduced with its cone longitudinal axis on the longitudinal axis of the change holder receptacle in the base part in this embodiment, however, because then abuts the Basisumgriff against the support projection before it has reached its Umgriffposition. Rather, it must be guided along the parallel insertion edge along the corresponding inner wall of the removable holder receptacle. In the other direction can be achieved in this way in the direction of the longitudinal axis of the Wechselhalteraufnahme or in the direction of the axis of the Wechselhalteraufnahme, in the radial direction on all sides the smallest possible distances to the wall of the change holder receptacle, by the support projection embracing base projection a kind of undercut be additionally stabilized, the storage of the swap holder in the base part.

Particularly resistant and compact exchange holder systems can then be obtained if the change holder and the base part are formed in such a way that the longitudinal axis of the change holder receptacle is parallel or in particular coaxial with the longitudinal axis of the bit holder. In this embodiment, the bit in the bit holder and the changeover holder are inserted into the changeover holder thus in the same direction and preferably even on the same axis with respect to the base part.

Alternatively, the solution of the problem with a swap body system comprising a base part with a change holder and a trained for inclusion in the change holder holder change holder with a chisel, the change holder has a bearing body and a bearing body projecting Basisumgriff, by means of a slide and rotary movement can be brought into engagement with a support projection arranged on the base part is. This embodiment and the developments going back to it are hereinafter also referred to as "insertion and Eindrehvariante". The essential feature of this embodiment is thus again in the special training of Basisumgriffs in relation to the support projection. With regard to the basic structure, reference is therefore made to the preceding embodiments and only the differences of the "insertion and Eindrehvariante" to "Eindrehvariante" are explained in detail. In principle, the interchangeable-holder system of this embodiment also comprises a base part with a change-holder holder and a change-holder holder with a chisel holder designed to be received in the change-holder holder. In contrast to the previous variant of the invention, the change-over holder, which likewise has a bearing body and a base grip projecting from the bearing body, can be brought into engagement with a support projection arranged on the base part by means of a combined insertion and rotational movement. The assembly of the swivel holder in the base part is thus carried out by means of a combined movement sequence with a, in particular linear, insertion portion and a, in particular about the longitudinal axis of the change holder holder, rotational rotary component. The rotational movement preferably takes place about the longitudinal axis of the bit holder and / or about the longitudinal axis of the holder holder in the base part. With this embodiment, it is possible to secure the changeover holder in the longitudinal direction even better on the base part, as will be explained in more detail below. The difference from the previous embodiment is thus that the change holder is just about a slide-in movement alone in the base part can not be introduced, but requires a combined rotation and insertion movement. The insertion movement and the rotational movement take place successively in such a way that when inserting the change holder into the base part, first the insertion movement and then the Eindrehbewegung up to the final position of the change holder on the base part. The peculiarity of this embodiment of the invention lies in the fact that the contact surface of the Basisumgriffs is not flat, but bent around an axis a shape of a surface section of a cone. In the axial direction, however, this contact surface also intersects the longitudinal axis of the bit holder of the replaceable container or the longitudinal / rotational axis of the round shank bit stored in the change holder, in particular at an angle> 0 °, especially in the range greater than 0 ° to 15 °, especially 2 ° to 10 ° °. In this context, reference is made to the above comments on the insertion variant.

Preferably, the changeover holder and the base part are thus connected to each other in the manner of a bayonet closure. In this embodiment, the base gripping and the supporting projection are formed in such a manner that for inserting the exchangeable holder into the base part, the rotational movement takes place after the insertion movement (and for removing in the reverse order). The embracing of the support projection by the base gripping is thus achieved in particular by a screwing of the exchangeable holder relative to the base part, preferably with a rotary movement of less than 60 °, especially less than 50 ° and in particular less than 45 °. In the state screwed into the base part or when the base gripping surrounds the support projection, the changeover holder can thus no longer be removed from the base part in a linearly directed movement and is thus additionally secured in the base part.

Specifically, the support projection may be formed in this variant, for example, as a circular arc-shaped groove segment into which the Basisumgriff is screwed. For this purpose, the base grip can be designed in the form of a bolt. For reasons of stability, however, it is ideal if the base gripping is designed in the form of a bent beam, which engages in a planar manner, for example in the above-mentioned arcuate groove segment.

The mounting of the change holder in the base part is greatly facilitated if a rotation stop is present, which limits the rotational movement of the change holder relative to the base part in the screwing. The fitter must thus turn the changeover holder against the rotation stop in this embodiment. Then it is ensured for him that the change holder has assumed its correct seating position. Preferably, a rotation stop in the opposite direction may be present. This facilitates the disassembly insofar as that the change holder must first be rotated to release from the base part to the counter-stop and then pulled out of the base part.

The following explanations concern both the "insertion variant" and the "insertion and insertion variant".

In principle, it is advantageous for the various above-mentioned interchangeable holder systems according to the invention if the supporting projection has an insertion stop which is designed in such a way that it limits the insertion movement of the interchangeable holder into the base part in the direction of insertion. In this case, the insertion stop, depending on the embodiment, for example, be obtained by the conical shape of the bearing mounted in the base portion of the swap holder. As soon as the cone rests or strikes with its side wall in the change-holder holder in the base part, it does not slide further, at least unloaded, into the change-holder holder. Additionally or alternatively, it is possible that the bearing body has an outer stop and in the radial direction projecting stop, in particular ring stop or the bearing body annular circumferential stop, which abuts against the front end of the change holder receptacle. For this purpose, the front end of the change holder holder, for example, is formed as a hollow cylindrical projection which projects beyond the remaining body of the base member against the insertion direction. The support projection is further preferably integrated in this projection in this embodiment, and the base handle is further preferably formed as part of this ring stop. Alternatively or additionally, finally, the base grip on the support projection strike in such a way that it limits the extent of the insertion movement of the change holder into the base part. The Basisumgriff proposes this either with its protruding in the direction of insertion end face at the bottom of the support projection and / or with its rearwardly offset in the insertion direction inner surface on the head portion of the support projection, ie the counter to the insertion direction protruding part.

In principle, it is possible with the various change-holder systems according to the invention to hold the change-over holder via press fit or press fit in the base part. For disassembly, it is therefore also initially necessary to overcome or solve this interference fit, for example with the aid of hammer blows in Austreibrichtung, etc., or. Alternatively, it is also possible to secure the inserted into the base part change holder with a captive. Such a captive can, for example, be a connecting screw between the base part and the changeover holder. Alternatively, a clamping sleeve or a safety pin can be used. It is also essential that the captive is arranged in such a way that it acts transversely to the insertion direction of the change holder in the base part. In this way, any tensile and compressive loads occurring in or against the direction of insertion of the swap holder into the base part do not act on the anti-loss device, so that it is relieved of load. The anti-loss device makes it possible to hold the change-over holder in the base part without the need for an interference fit. This facilitates the assembly and disassembly of the swap holder on and from the base part.

The bearing body is preferably cone-shaped or cylindrical. In this case, the cone tapers in the insertion direction of the change holder in the base part. A cone-shaped bearing body has the advantage that it is ideally held by the base part in the region of the entire conical surface lying in the change-holder holder. This results in a particularly stable positioning of the change holder in the base part. The cylindrical design is advantageous in that as being relatively easy to manufacture and ideal for producing a resilient interference fit. Both forms are also advantageous in that they allow a uniform rotation of the exchange holder relative to the base part about the cylinder axis or cone axis. This is particularly advantageous for the embodiment of the invention, in which the assembly of the swap holder on the base part via a combined insertion and rotation of the swivel holder relative to the base part takes place. In addition to the preferred cylindrical or conical shape of the bearing body but other shapes of the bearing body are in principle possible, such as a cuboid or pyramidal shape, shapes with oval or polygonal cross-sections in the insertion direction, etc .. It is important for the shape of the bearing body, that in the removable holder receptacle can be inserted and, depending on the embodiment, can be screwed in

Ideally, the interchangeable holder system has an access opening located in the rear region of the base part in order to allow access to the interchangeable holder from the rear side or against the direction of insertion. It is further preferred that a corresponding access opening is also present in the exchangeable holder, so that also the bit receptacle is accessible from the rear region of the base part. In this way, for example, a chisel stuck in the bit receptacle can be expelled from the back of the replaceable holder system, for example with a suitable expelling tool, without the disassembly of the replaceable holder system being required for this purpose. The access opening in the removable holder and the access opening in the base part are therefore preferably superimposed in these embodiments so that they form a common passage from the outside into the chisel holder. This access opening is further preferably formed in such a way that it faces outward with respect to the base surface or mounting surface of the base part. When mounted on a milling drum state, the access openings of the individual swap-holder systems are then arranged lying outwards and can be kept clean, for example by splashing. This counteracts clogging of the access opening with dirt and abrasion, which, as a result, also makes it easier to handle the swap-holder system.

Both the base part and the changeover holder are preferably made solid, for example as a forged or cast part.

In order to further minimize or prevent the entry of dirt into the mating area between the changeover holder and the base part, it is possible to provide a separate sealing of the fitting region. Such a seal can for example by means of a suitable O-rings can be achieved, which is arranged in particular at the height of the inlet region of the change holder in the change holder receptacle of the base part. In this case, the seal seals the fit region in other words on the insertion side of the change-holder holder from or at the "front" end of the change-holder holder. The "front" end of the change-holder holder corresponds to the input of the change-holder holder closer to the base gripper in the base part. Alternatively or additionally, a seal of the fit region can be provided at the "rear" end. In practical use, it has been found that a seal at the front end alone is particularly suitable for a conically shaped fitting area and a seal on both sides, in particular for a cylindrically shaped fitting area.

In principle, it is possible for the change holder and the base part to be configured in such a way that the change holder with its base grip in the state mounted in the base part is in direct contact with the support projection of the base part, in particular in the radial direction with respect to the longitudinal axis of the change holder receptacle. However, this requires a very precise work, especially in the manufacture and installation of the change holder in the base part ahead. It is therefore ideal if, at least in relation to the longitudinal axis of the change holder receptacle radial direction or parallel thereto, a gap between the base handle and the support projection is present, in particular in the range> 0 mm to 0.5 mm, in particular 0.05 mm to 0 , 5 mm, in each case based on the radial direction or the corresponding parallel. There is thus an easy play between the base gripping and the supporting projection, which considerably facilitates the installation. At the same time, the gap is dimensioned so small that already relatively small deformations of the swivel holder against the radial direction press the Basisumgriff against the support projection and thus the Basisumgriff to rest on the support projection, which early in the load case relief of the swap holder is guaranteed.

In the radial direction to the longitudinal axis of the change holder receptacle facing each other or obliquely or parallel to the insertion direction surfaces between the base handle and the support projection may be formed in principle parallel to each other. In this case, if, for example, a gap given above is present, the inner surface of the Basisumgriffs but is pressed obliquely in the loading case on the outside and in the radial direction opposite surface of the support projection, which ultimately has a punctual or linear contact and thus a high load of the contact area result , It is therefore preferable if these opposing surfaces are at an angle to each other in the unloaded state, wherein the angle is preferably dimensioned such that the base grip in the load case with its facing in the radial direction of the support projection contact surface areally comes to rest against the corresponding contact surface on the support projection to allow an ideal relief of the change holder.

In principle, it is additionally possible to use suitable pastes and greases in the area of fit between the change-over holder and the base part, in order to further improve the locking stability of the change-over holder system. In addition, it is basically advantageous if the contact surfaces between the base part and the changeover holder are formed as flush as possible.

Fig. 1

ein Wechselhaltersystem in perspektivischer Ansicht von schräg vorn rechts in einer ersten Ausführungsform;

Fig. 2

das Wechselhaltersystem aus Fig. 1 in einer Ansicht von schräg vorn links mit zum Teil herausgezogenem Wechselhalter;

Fig. 3

eine Ansicht von schräg hinten auf das Wechselhaltersystem aus den Figuren 1 und 2;

Fig. 4

einen Längsschnitt durch das Wechselhaltersystem aus den Figuren 1 bis 3;

Fig. 5

einen Längsschnitt durch ein Wechselhaltersystem in einer zweiten Ausführungsform;

Fig. 6

eine perspektivische Schrägansicht von schräg vorne auf ein Wechselhaltersystem in einer dritten Ausführungsform;

Fig. 7

das Wechselhaltersystem aus Fig. 6 mit abgenommener Drehsicherung und aus dem Eingriff herausgedrehtem Wechselhalter;

Fig. 8

eine Rückansicht auf das Wechselhaltersystem aus Fig. 6;

Fig. 9

eine Längsschnittansicht des Wechselhaltersystems aus Fig. 6;

Fig. 10

eine Längsschnittansicht einer weiteren Ausführungsform eines Wechselhaltersystems;

Fig. 11

eine Ausschnittsvergrößerung des Umgriffbereichs aus Fig. 4; und

Fig. 12

eine Ausschnittsvergrößerung des Umgriffbereichs aus Fig. 9.

The invention will be further explained with reference to two embodiments. They show schematically:

Fig. 1

a change-holder system in a perspective view obliquely from the front right in a first embodiment;

Fig. 2

the swap-holder system Fig. 1 in a view obliquely from the left front with partially withdrawn changeover holder;

Fig. 3

a view obliquely from behind on the change-holder system from the Figures 1 and 2 ;

Fig. 4

a longitudinal section through the change-holder system from the FIGS. 1 to 3 ;

Fig. 5

a longitudinal section through a change-holder system in a second embodiment;

Fig. 6

a perspective oblique view obliquely from the front of a change-holder system in a third embodiment;

Fig. 7

the swap-holder system Fig. 6 with removed rotation lock and unscrewed from engagement change holder;

Fig. 8

a rear view of the change-holder system Fig. 6 ;

Fig. 9

a longitudinal sectional view of the interchangeable holder system Fig. 6 ;

Fig. 10

a longitudinal sectional view of another embodiment of a change-holder system;

Fig. 11

a partial enlargement of the Umgriffbereichs Fig. 4 ; and

Fig. 12

a partial enlargement of the Umgriffbereichs Fig. 9 ,

Identical and functionally identical components are provided in the following figures with the same reference numerals. The FIGS. 1 to 5 and 11 relate to embodiments for the insertion variant of the invention and are marked with 100 reference numerals. The FIGS. 6 to 10 and 12 relate to embodiments for the combined insertion and Eindrehvariante of the invention and are marked with 200 reference numerals. Functionally and or structurally identical components are given with corresponding in one and two-digit area reference numerals and will not be listed individually for each embodiment for the sake of clarity. The reference numeral 110 (base part) of the insertion variant thus corresponds to reference numeral 210 (base part) of the insertion and Eindrehvariante, etc .. Repeating components are also not marked separately in each figure.

Fig. 1 relates to a change-over holder system 100 with a base part 110 and a change-over holder 120. In Fig. 1 Furthermore, as a tool for tillage a chisel 130, which is designed as a so-called round shank chisel exists. A plurality of such swap-holder systems 100 are applied to a cylindrical roller for use and brought into rotation in working direction AR during use. The FIGS. 1 to 4 and 11 illustrate the structure and operation of the interchangeable holder system 100 and will be explained together in more detail below.

In the FIGS. 1, 2 . 3 and 4 the chisel 130 comprises a cylindrical bearing shaft 131 and a chisel head 132 with a contact surface 133 facing the changeover holder 120 and a chisel tip 134 facing away from the changeover holder 120. The chisel 130 is arranged in the changer holder 120 and is held by the latter. For this purpose, the change holder 120 has a cylindrical bit receptacle 121 which extends linearly along the longitudinal axis A1 of the exchangeable holder 120 from the bit insert or the annular bit stop surface 122. The longitudinal axis A1 of the interchangeable holder 120 is thus defined defined by the longitudinal axis of the bit holder 121 or by the coaxially extending axis of rotation A1 of the recorded in the bit holder 121 round shank chisel 130. In the bit receptacle 121, the bit 130 is braced with a clamping sleeve 135 with the inner wall of the bit receptacle 121. The bit receptacle 121 leads to the rear into an outlet opening 122, which is open to the outside of the exchangeable holder system 100 and establishes a connection from the rear of the bit 130 mounted in the bit receptacle 121 to the outside environment of the exchangeable holder system 100. Through the exit bore, access to the front end of the bit 130 received in the bit receptacle 121 is possible, for example, for disassembly purposes.

The bit receptacle 121 is part of a bearing body 123 of the exchangeable holder 120 which, in the axial direction of the longitudinal axis A1 of the bit receptacle 121, initially has a cone-shaped rear region mounted in the base part 110 and a projecting front region. The bearing body 123 is thus formed longitudinally along the axis A1. The cylinder axis of the bit 130 and the longitudinal axis A1 of the bit receptacle 121 are coaxial. In addition to the bearing body 123, the changeover holder 120 comprises a Basisumgriff 126, with respect to the axis A1 in Radially protrudes outward and has a web portion 127 and a Umgriffarm 128. The base gripping 126 thus protrudes outward in the radial direction with respect to the longitudinal axis A1 of the bearing part 123 and has in its end region a cranked over or protruding gripping arm 128 bent over in the insertion direction. Thus, a receiving space is formed between the wraparound arm 128 and the outer wall of the bearing part 123 opposite thereto, into which a support projection 111 of the base part 110 is received when inserting the exchangeable holder 120 into the base part 110. This area is thus generally U-shaped on average, wherein the Umgriffarm 128 forms a leg of this U-profile and has on its inner side a bearing surface 180.

An essential component of the base part is therefore initially the support projection 111, which in the present case is part of a groove 112 which extends transversely over the base part 110. The base part 110 further has an assembly area 113 located on the underside with fastening feet, via which the base part 110 is welded onto, for example, a cylindrical body of a milling drum. As a result, the connection to the respective support element of the working device is produced via the mounting surface 113. The Basisumgriff 126 is relative to the axes A1, A2, or A3 in the radial direction in the direction of the mounting portion 113 and the Umgriffarm 128 is bent in the direction of insertion.

In the base part 110, a change holder receptacle 114 is also provided, which is designed to receive the rear region 124 of the bearing body 123. The change-holder receptacle 124 is also substantially (hollow) conical or complementary to the conical region of the replaceable holder 120 and forms in this region a receptacle into which the bearing body 123 partially or completely comes into abutment in the inserted state. In relation to the working direction AR of the chisel 130 rear portion of the base member 110, an outlet opening 115 is also present, coming from the outside into the outlet hole 122 in the removable holder 120, so that the back of the inserted into the bit holder 121 bit 130 from the outside through the outlet opening 115th and the exit port 122 is accessible. Thus, for example, a Austreibdruck be applied to the bit 130 for pushing out the bit 130 against the insertion direction C of the bit 130 from the bit receptacle 121 to the end of the bit 130. The insertion direction C of the bit 130 is in the present embodiment (and also in the other embodiments) on the longitudinal axis A1 of the bit receptacle 121st

For installation of the changeable holder 120 in the base part 110, the changeover holder 120 in the insertion direction B, as shown in Fig. 2 shown is inserted. The Basisumgriff 126 is thereby pushed onto the base part 110 and engages around the support projection 111 in the radial direction to the longitudinal axis A1 of the Wechselhalteraufnahme 114. Envelope here means thus that the Basisumgriff 126 and the corresponding region of the bearing body 123 on both sides of the support projection 111 [at the two in the radial direction opposite sides 111a (radially outer side of the support projection 111) and 111b (radially inner side of the support projection)] and sandwich the support projection 111 in this area. For this purpose, it is not absolutely necessary that the Basisumgriff 126 on both sides 111 a and 111 b comes to rest, as it is in Fig. 4 For example, shown.

The radially outer side of the support projection 111a extends in the axial direction further obliquely to the longitudinal axis A1 of the bit holder in the changeover holder. This side is designed as a plane contact surface for the base grip 128 or for the contact surface 180. In the longitudinal section plane in Fig. 4 are the longitudinal axis A1 and the longitudinal axis A2 of the wall 111a and parallel thereto extending inner edge 124a of the rear portion of the bearing body 123 with the axis A3 (corresponding to the insertion axis) at the angle α to each other. This special design has the advantage that the support projection 126 is not formed at right angles but undercut relative to the outer side wall 111a in the direction of insertion C and thus represents a hook-like security in the longitudinal direction A1 of the bit holder. For the installation of the change holder 120 in the base part 110, it is therefore also necessary that the changeover holder 120 is inserted into abutment against the mounting edge A3 in the direction B in the base part 110.

The changeover holder 120 is also fixed against rotation on the base part 110. The rotation is also ensured by the retracted in the state with its Basisumgriff 126 the support projection 111 encompassing Umgriffarm 128 in the inserted state relative to the cone axis A1 or longitudinal axis of the change holder 120 in the radial direction, comparable to one, based on the circular in the radial plane Chisel holder 121, Passante, which is in a positive connection with the base handle 126. Thus, the rotational movement is blocked in this plane and the changeover holder 120 mounted against rotation about the axis A1 against the base part 110.

The extent of the insertion movement is limited by abutment of the cone outer surface of the rear region 124 of the bearing body 123 on the cone inner wall of the base part 110 in the removable holder receptacle 114. This space is also sealed to the outside by a seal, specifically the O-ring seal 116. The change holder 120, however, comes in the direction of insertion neither with its base handle 126 nor with the front end of the bearing body 123 for direct contact with the base part 110, so that in the direction of insertion B quite still settlements can occur in the working mode. For this reason, the free spaces H1 and H2 are present in the insertion direction in these areas between the base part 110 and the changeover holder 120. In order to prevent slippage of the change holder 120 from the base part 110 and to ensure reliable storage, therefore, a screw 150 is present, which is screwed through a suitable bore in the base part 110 in an internally threaded portion 151 in the removable holder 120 from the rear. The longitudinal axis of the screw lies coaxially with the longitudinal axis A1. In the axial direction A1, the screw connection with the screw 150 is further cushioned by a spring washer 152, so that possibly occurring in the insertion direction B or in the axial direction C settlements are compensated during operation.

In the base part 110 and the change-over holder 120, sloping wedge surfaces, which effect a better guidance of the milled material, are disposed in each case symmetrically with respect to the mounting region 113. This arrangement is also referred to collectively as Materialleitbereich comprising a changeover-side part 129 and a base part-side part 119.

An essential advantage of the interchangeable holder system 110 is first that the mounting of the interchangeable holder 120 on the base part 110 is particularly simple, since the interchangeable holder 120 can be pushed accurately on the base part 110. A guarantee of the correct positioning is achieved in particular by the relative to the base 110 rotatably mounted changeover holder 120 by means of the support projection 111 encompassing base handle 126, which thus corresponds to a total positive guidance of the change holder 120 in the base part 110. A further advantage lies in the fact that a force relief of the forces acting on the changeover holder forces is caused by the wrap. Usually act in the working mode applied to the bit 130 counterforce by the substrate to be processed in the direction of arrow F on the chisel 130. This force is transmitted to the changeover holder 120. By Grundumgriff 126 is therefore obtained a kind of overload protection, since by means of the Umgriffs 128 part of the force acting on the changeover holder F is transmitted directly to the support projection 111. In the embodiment according to the FIGS. 1 to 4 the Basisumgriff 126 is with its Umgriffarm 128 on the support projection 111 in the radial direction to A2 and A3 in the direction of the changeover holder 120 (the contact surface 111 a is congruent to the contact surface 180), so that a discharge under load of the bit 130 immediately occurs. The detail enlargement in Fig. 11 that the dashed box in Fig. 4 corresponds, this arrangement illustrates.

Fig. 5 shows the longitudinal section of an alternative embodiment of the exchange system 100 from the FIGS. 1 to 4 , Wherein structurally identical or functionally identical components are provided with the same reference numerals. The main difference of the exchange system 100 from Fig. 5 consists in the manner of performing the fixation of the change holder 120 on the base part 110, which in contrast to the embodiment according to the FIGS. 1 to 4 in Fig. 5 is achieved by a cylindrical seat, specifically a press fit. An additional backup of the change holder 120 in the base part 110, for example by a fixing screw, is therefore not required. In the longitudinal direction two further with respect to the axis A1 in the axial direction one behind the other O-ring seals are also available.

The FIGS. 6, 7 . 8 and 9 show different views of a further embodiment of a change-holder system 200, which corresponds in its basic structure to the aforementioned change-holder system. With regard to functionally corresponding components, reference is made to the preceding figures. For reasons of clarity, furthermore, not every correspondingly introduced reference numeral is included in the FIGS. 6 to 10 be reiterated. On the contrary, the differences will be dealt with essentially, and with respect to the similarities, reference will be made to the previous statements.

The essential difference between the interchangeable-holder system 200 and the interchangeable-holder system 100 is the design of the base part 210 and the interchangeable holder 220 in such a way that the interchangeable holder 220 can be introduced into the base part 210 in a combined insertion and rotation movement. The embracing of the support projection 211 by the Basisumgriff 226 succeeds in this embodiment, not only by inserting the change holder into the base part or pushing the Basisumgriffs on the support projection, but by a combined insertion and Eindrehbewegung.

Specifically, this succeeds in the embodiment 200 according to the FIGS. 6 to 9 with the circular segment-like design of the base gripping 226 and the circular-arc-segment-like formation of the groove 212. It is important for understanding the operation of the interchangeable holder system 200 first, in that the circular paths of the groove 212 and of the part of the base handle 226 facing the change holder 220 are concentric with the axis of rotation D about which the change holder 220 is screwed in (or removed for disassembly) for engagement with the base part 210. In the swivel holder system 200, the axis of rotation D is at the same time the longitudinal axis A1 of the chisel receiver 221.

Another essential detail is further that the Basisumgriff 226 is undercut and thus forms a hook element in the installed state against the insertion direction B, which secures the change holder 220 with respect to its axial displacement against the insertion direction B relative to the base part 210. This is particularly clear from a comparison of the position of the longitudinal axis A1 and the parallel cylindrical wall in the change holder receptacle 214 A2 or the thus in contact cylindrical region of the change holder 220 with the axis A3 extending obliquely thereto. The axis A3 extends along the contact surface between the facing to the changeover holder 220 portion of the Umgriffarms 228 of the base handle 226 and the radially outwardly facing portion of the support projection 211. The existing there on the changeover holder 220 contact surface 280 corresponds to a curved axis about the longitudinal axis A1, the in their training corresponds to a surface section of a cone. In the plane of the axes A1 and A3 or in the sectional plane through the interchangeable-holder system 200 in which the axes A1 and / or A3 lie, these axes converge at an angle α and intersect. It is thus not possible to withdraw the changeover holder 220 in its installed and screwed state from the base part 210 against the insertion direction B. Rather, this is prevented by the gripping arm 228 of the base gripping 226 engaging behind the supporting projection 211. The change holder 220 or the base handle thus forms a kind of bayonet closure with the base part 110 or its support projection.

Basically, the changeover holder 220 relative to the base part 210, at least in the area between the state behind the support projection 211 and the herausgerehten insertion state pivotally relative to the base part 210. Although in principle the use of pivot limitations, for example in the groove 212 or the support projection 211 is possible, that is in the FIGS. 6 to 9 illustrated embodiment formed in such a way that the changeover holder 220 in the inserted into the base member 210 state by 360 ° about the rotation axis D (which is coaxial with the axis A1, is rotatable.

The extent of the insertion is limited in the present embodiment by a stop of the interchangeable holder 220 against the axially projecting annular stop of the base member 210 against which the changeover holder abuts with a corresponding counter surface. In order to prevent unscrewing of the wraparound arm 228 of the exchangeable holder 220 from the undercut of the supporting projection 211 of the base part 210 during operation of the exchangeable holder system 200, an anti-twist device is also provided in the exchangeable holder system 200. Specifically, this is obtained by a securing screw 250, which screws the change holder 220 to the base part 210 perpendicular to the longitudinal axis or axis of rotation. The screw 250 is therefore almost completely decoupled with respect to the change holder acting, transmitted by the bit forces (except possibly occurring torsional forces of the round shank bit 230) and therefore has a very long life. To disassemble the screw 250 must first be removed and removed (arrow P1) and then the changeover holder 220 from the position in Fig. 6 rotated in the direction of arrow P2 from the engagement of the Basisumgriffs 126 on the support projection 111 out and then pulled against the insertion direction B from the base part 210 out (for mounting in accordance with the opposite order). This will be explained in more detail below.

Moreover, in the embodiment of the interchangeable holder system 200, the base part 210 and the interchangeable holder 220 are rearward, i. pointing away from the tip of the bit 230 pointing generously open in both the axial and perpendicular to the axial direction outward and thus allows, for example, access to the back of the bit in the bit receptacle 221. This opening also facilitates cleaning and cooling of the entire system, as the Chisel 230 and the change holder 220 are directly accessible from behind. The bit receptacle 221 is also rectilinear and the changeover holder formed completely continuous. Similarly, the Wechselhalteraufnahme 214 is also straight and the base member 210 formed completely continuous and arranged with respect to its longitudinal axis coaxial with the bit 230 and coaxial with the longitudinal axis of the bit holder 221.

Especially FIG. 7 illustrates the essential characteristic of the embodiment of the interchangeable holder system 200 with the manner of a bayonet closure connection manner between the base part 210 and the changeover holder 220. FIG. 7 indicates thereby starting from the state in FIG. 6 the dismantling steps again. Accordingly, the mounting purposes for installing the exchangeable holder 220 into the base part 210 are in reverse order. First, the fastening screw 250 is released, whereby the achieved with the screw 250 against rotation of the removable holder 220 relative to the base part 210 is repealed. Therefore, the changeover holder 220 can be rotated in a next step about the rotation axis D in the direction of arrow P2 from the bayonet mount. For this purpose, the base handle 226 must be rotated so far that it comes out of engagement with the formed in the support projection 211 undercut. Then the Change holder 220 in the direction of arrow P3 or opposite to the insertion direction of the change holder 220 in the base part 210 are pulled out of the base part 210. At the same time, this embodiment also enables the force relief already mentioned above for working example 100 in working mode. In this case, the force F is introduced in the direction of arrow F in the round shank chisel 230 and the entire changeover holder 220 thus pushed in the direction of arrow F, which can lead to significant material loads. By Basisumgriff 226 relief takes place in such a manner that the contact surface 280 abuts against the inner surface of the U-leg of the Basisumgriffs 226 on the counter surface 211 a and in this area allows a force transmission of the loading force F.

Fig. 12 clarifies the investment conditions of the embodiment of the FIGS. 6 to 9 with respect to the base gripping 226 on the support projection 211. In contrast to the previous embodiments, the base gripping 226 also abuts with its web region 227 in the direction of insertion against the abutment surface 260 of the support projection 211. On the other hand, the parallel surface in the end region of the wraparound arm 228 in the insertion direction is spaced from the bottom of the groove 212 (free space FR).

FIG. 10 Finally, a longitudinal sectional view of a further variant of the interchangeable-holder system 200 is concerned, in which case the positioning of the anti-rotation device has been varied. Instead of the internal screw 250, a top-mounted clamping pin 270 is also inserted transversely to the axis of rotation in a superimposed bore 261 in the base part 210 and the removable holder 220 and thus prevents the rotational capability of the removable holder 220 relative to the base part 210.

Claims (18)

1. Quick-change tool holder system (100), comprising

   - a base part (110) with a quick-change tool holder receptacle (114) and a supporting projection (111) and

   - a quick-change tool holder (120) configured for insertion in the quick-change tool holder receptacle and comprising a chisel receptacle (121) for a round shank chisel (130) with a longitudinal axis (A1),

   wherein the quick-change tool holder (120) has a mounting body (123) and a base gripping part (126) protruding radially with respect to the direction of insertion of the quick-change tool holder (120) in the base part (110) and projecting in the direction of insertion, which base gripping part (126) grips the supporting projection (111) on the base part (110) in an inserted stated, and wherein the base gripping part has a contact surface (180) for making contact with an outer side (111 a) of the supporting projection (111) in the radial direction, which is configured as undercut in the insertion direction, runs obliquely in the insertion direction relative to the longitudinal axis (A1) and intersects the same in its extension at an angle (α) of greater than 0° to 15° in an area behind the base gripping part.
2. The quick-change tool holder system (100) according to the preceding claim,
   characterized in that
   the base gripping part (126) and the supporting projection (111) are configured with respect to one another in such a way that the quick-change tool holder (120) is mounted in the base part (110) in a non-rotatable manner.
3. The quick-change tool holder system (100) according to any one of the preceding claims,
   characterized in that
   the base gripping part (126) has an angled profile.
4. The quick-change tool holder system (100) according to any one of the preceding claims,
   characterized in that
   the base gripping part (126) is a stop bar arranged askew to the axis of insertion of the quick-change tool holder (120).
5. The quick-change tool holder system (100) according to any one of the preceding claims, characterized in that
   the supporting projection (111) is part of a groove in the base part (110).
6. The quick-change tool holder system (100) according to any one of the preceding claims,
   characterized in that
   the quick-change tool holder (120) and the base part (110) are configured such that the longitudinal axis of the quick-change tool holder receptacle is coaxial to the longitudinal axis of the chisel receptacle.
7. Quick-change tool holder system (200), comprising

   - a base part (210) with a quick-change tool holder receptacle and

   - a quick-change tool holder (220) configured to be received in the quick-change tool holder receptacle and comprising a chisel receptacle,

   wherein the quick-change tool holder (220) has a mounting body and a base gripping part projecting from the mounting body, which base gripping part can be brought into engagement with a supporting projection (211) arranged on the base part (220) by means of an insertion and turning motion,
   characterized in that
   the quick-change tool holder (220) comprises a contact surface (280) which corresponds to a surface bent around a longitudinal axis (A1) of the quick-change tool holder receptacle and configured as a cut-out surface of a cone, which intersects the longitudinal axis (A1) at an angle α and together with a wall (211 a) of the supporting projection (211) forms an undercut, and that the turning movement occurs about the longitudinal axis.
8. The quick-change tool holder system (200) according to claim 7,
   characterized in that
   the base gripping part (226) and the supporting projection (211) are configured such that, for the introduction of the quick-change tool holder (210) in the base part (220), the turning motion occurs after the insertion motion.
9. The quick-change tool holder system (200) according to any one of claims 7 or 8,
   characterized in that
   the supporting projection (211) is part of an arc-shaped groove segment.
10. The quick-change tool holder system (200) according to any one of claims 7 to 9,
    characterized in that
    the base gripping part (226) is configured in the form of a bent bar.
11. The quick-change tool holder system (200) according to any one of claims 7 to 10,
    characterized in that
    a rotary stop is present that limits the turning motion of the quick-change tool holder (220) relative to the base part (210) in the turning direction.
12. The quick-change tool holder system (100, 200) according to any one of the preceding claims,
    characterized in that
    the supporting projection (211) has an insertion stop.
13. The quick-change tool holder system (100, 200) according to any one of the preceding claims,
    characterized in that
    a securing device is provided.
14. The quick-change tool holder system (100, 200) according to any one of the preceding claims,
    characterized in that
    the securing device is a connecting screw between the base part (110, 210) and the quick-change tool holder (120, 220).
15. The quick-change tool holder system (100, 200) according to any one of the preceding claims,
    characterized in that
    the mounting body (123, 223) is configured in the shape of a cone.
16. The quick-change tool holder system (100, 200) according to any one of claims 1 to 14,
    characterized in that
    the mounting body (123, 223) is configured in the shape of a cylinder.
17. The quick-change tool holder system (100, 200) according to any one of claims 15 or 16,
    characterized in that
    in the inserted state the mounting body (123,223) is sealed towards the base part (110, 210), in particular on both sides.
18. The quick-change tool holder system (100, 200) according to any one of the preceding claims,
    characterized in that
    the quick-change tool holder (120, 220) and the base part (110, 210) comprise an access opening via which the chisel receptacle is accessible from a rear area.

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