DK2897733T3

DK2897733T3 - ARRANGEMENT OF A CRUSHING TOOTH ON A CRUSHING ROLL OF A ROLLER CRUSHER

Info

Publication number: DK2897733T3
Application number: DK13766273.0T
Authority: DK
Inventors: Piotr Szczelina; Shariatzadeh Khezr
Original assignee: Thyssenkrupp Ind Solutions Ag
Priority date: 2012-09-21
Filing date: 2013-09-20
Publication date: 2018-07-30
Also published as: BR112015006148B1; AU2013320199A1; EP2897733B1; WO2014044797A2; WO2014044797A3; EP2897733A2; EA201590514A1; CN104797342A; CN104797342B; AU2013320199B2; DE102012108935A1; EA029248B1; BR112015006148A2

Description

Arrangement of a crusher tooth on a crushing roll of a roll crusher

Description

The present invention relates to an arrangement of a crusher tooth on a crushing roll of a roll crusher, wherein a continuous tooth receptacle having an opening into which the crusher tooth is introducible from a first side and retainable is arranged on the crushing roll, and wherein a clamping sleeve is provided, in which a shank of the crusher tooth is accommodated with the clamping sleeve being radially braced in the opening. Furthermore, the invention is directed at a method for arranging a crusher tooth on a crushing roll of a roll crusher.

Roll crushers serve to break up or comminute material to be crushed or other materials and, depending on their configuration, can also be referred to as sizers. The basic structure of a roll crusher has at least two crushing rolls that rotate in opposite directions, and between the crushing rolls there is formed a crushing nip into which the material to be crushed or comminuted or other material is drawn. Arranged on the outer circumference of the crushing rolls are a number of crusher teeth which are retained in tooth receptacles and are thus arranged on the crushing roll. By way of the crusher teeth, the material is directly broken up or gripped and pulled into the nip between the crushing rolls. Depending on the material to be broken up or comminuted, very high forces therefore act, as a result the process, on the crusher teeth, and so the retained arrangement of the crusher teeth in the tooth receptacles on the outer circumference of the crushing rolls has to withstand high mechanical loads.

PRIOR ART

For example, DE 41 23 967 A1 shows the arrangement of crusher teeth on a crushing roll, and arranged on the crushing rolls are tooth carriers in the form of crushing plates which form a respective tooth receptacle having an opening. The crusher tooth has a shank in the form of a pin which projects into the opening in the tooth receptacle and is wedged by way of a wedge element in the opening of the tooth receptacle. Such a configuration of the tooth receptacle and of the arrangement of the crusher tooth in the opening of the tooth receptacle requires a complicated production method, and as a result of the type of fastening by means of the wedge element, a mechanical loading direction of the crusher tooth in the tooth receptacle has to be taken into consideration. WO 2012/113707 A2 discloses an arrangement of a crusher tooth on a crushing roll for example for degradation or for comminuting material to be crushed, wherein a continuous tooth receptacle having an opening is arranged on the crushing roll, into which opening the crusher tooth is introducible from a first side and retainable, wherein a clamping sleeve is provided, which is introduced into the opening counter to the direction of introduction of the crusher tooth and in which a shank of the crusher tooth is accommodated with the clamping sleeve being radially braced in the opening. A drawback of this is the fixing of the crusher tooth in the clamping sleeve, since, on account of the shape of the screw connection, easy releasing of the clamped connection is not possible.

DISCLOSURE OF THE INVENTION

It is therefore the object of the present invention to create an arrangement of a crusher tooth on a crushing roll for a roll crusher, which is embodied in a simple manner and which can withstand high mechanical loads.

Proceeding from an arrangement of a crusher tooth on a crushing roll of a roll crusher according to the preamble of Claim 1, this object is achieved in conjunction with the characterizing features. Advantageous developments of the invention are specified in the dependent claims.

The invention includes the technical teaching that provision is made of a screw-connection element which is screwed in the crusher tooth by way of a screw shank and is seated in a screw receptacle in the clamping sleeve by way of a screw head.

As a result of the use of a clamping sleeve, in order to fasten the crusher tooth in the tooth receptacle, provision is made of a further component which has a degree of freedom of movement both with respect to the tooth receptacle and with respect to the crusher tooth. The particular advantage of the use of the clamping sleeve is that the latter can be drawn or pushed into a gap between the shank of the crusher tooth and the opening in the tooth receptacle, while the crusher tooth is already seated in a manner resting in the opening of the tooth receptacle. While the clamping sleeve is being pulled or pushed into the, for example radially circumferential, gap between the shank and the opening of the tooth receptacle, the shank can be braced in the opening, wherein the radial bracing of the clamping sleeve in the opening is produced by a cone which the shank of the crusher tooth forms together with the clamping sleeve. The further the clamping sleeve is pulled or pushed into the radial, circumferential gap, the greater the bracing forces between the tooth receptacle and the shank of the crusher tooth become.

The crusher tooth can have a tooth head which is formed with a bearing collar for bearing against a bearing rim, surrounding the opening, on the tooth receptacle. Comminution forces during operation of the roll crusher act on the crusher tooth via the tooth head, and since the tooth head bears against the bearing rim of the tooth receptacle by way of the bearing collar, the comminution forces are directly transferred from the tooth head into the tooth receptacle without the actual fastening of the crusher tooth in the tooth receptacle being mechanically loaded. The shank, which is located on the underside of the tooth head and projects into the opening of the tooth receptacle, is consequently mechanically loaded only minimally by the comminution forces under normal loading of the crusher tooth via the tooth head. A particular advantage arises from the fact that the bearing collar bears fully against the bearing rim of the tooth receptacle about the longitudinal axis of the crusher tooth, and independently of the loading direction of the tooth head, a force flow always takes place from the tooth head via the bearing collar and the bearing rim directly into the tooth receptacle. The clamping sleeve braces the crusher tooth in such a way in the tooth receptacle that the bearing collar of the tooth head is pressed against the bearing rim of the tooth receptacle, and the arrangement of the crusher tooth in the tooth receptacle thus has very high mechanical rigidity on account of the large bearing surface between the bearing collar and the bearing rim.

According to a further advantageous embodiment, the clamping sleeve can have a conical receptacle in which a likewise conically formed shank of the crusher tooth is seated. In this case, the opening in the tooth receptacle can be formed by a cylindrical bore, wherein the clamping sleeve has a cylindrical outer contour by way of which said clamping sleeve is seated in the opening. The outside diameter of the clamping sleeve can in this case correspond to the diameter of the opening in the tooth receptacle. Within the meaning of the present invention, however, the shank of the crusher tooth can also be embodied in a cylindrical manner, and the clamping sleeve can have a cylindrical receptacle in which the shank of the crusher tooth can be seated. In this case, the clamping sleeve can be embodied in an externally conical manner, and the opening in the tooth receptacle can have a conical opening into which the conical clamping sleeve can be drawn. This results in a functionally identical arrangement of the clamping sleeve between the shank of the crusher tooth and the tooth receptacle on the basis of a clamping receptacle that is likewise conical with regard to the overall arrangement.

The cone of the shank and the receptacle in the clamping sleeve can have a cone angle which has a value between for example 0.2° and 10°, preferably a value between 1° and 5° and particularly preferably a value of 2°. The cone angle can be such that the clamping sleeve holds the shank of the crusher tooth in a self-retaining manner in the opening of the tooth receptacle. As a result, securing means are not absolutely necessary in order to keep the clamping sleeve in its arrangement between the shank of the crusher tooth and the tooth receptacle.

Further advantageously, the clamping sleeve can be embodied in a slotted manner such that relatively large tangential stresses which would counteract the bracing action for bracing the shank of the crusher tooth in the clamping sleeve cannot build up in the clamping sleeve. In this case, the clamping sleeve can have for example one or more slots which extend at least partially through the clamping sleeve in a longitudinal direction of the latter.

According to the invention, provision is made of a screw-connection element which is screwed in the crusher tooth by way of a screw shank and is seated in a screw receptacle in the clamping sleeve by way of a screw head. As a result of this arrangement of a screw-connection element, the clamping sleeve is drawn into the gap between the shank of the crusher tooth and the tooth receptacle, or secured in the drawn-in arrangement.

The longitudinal direction of the clamping sleeve can form the rotational axis of the opening in the tooth receptacle, and the longitudinal direction can extend for instance in a manner tangentially spaced apart from the crushing roll. If the crushing roll is set in rotation, the tooth head of the crusher tooth points for instance in the direction of rotation and material which is introduced between two crushing rolls can be collected by the tooth head without the latter being loaded substantially from the side, that is to say transversely to the longitudinal direction. The tooth receptacle can in this case be arranged in a radially projecting manner on the crushing roll and in particular be integrally formed thereon or connected thereto in a cohesive manner. Crushing plates, as they are known, which can be screwed onto the outer circumference of the crushing roll and which have the tooth receptacle, are known. However, the tooth receptacle itself can also be connected directly to the body of the crushing roll, for example by way of a welded connection or by way of a screw connection.

Further advantageously, the radially circumferential seat of the crusher tooth in the tooth receptacle can have a form-fit region at at least one point, said form-fit region adjoining for example the internal region of the bearing rim. By way of the form fit, twisting of the crusher tooth in the tooth receptacle can be prevented, and this can be advantageous in particular during operation of the crushing roll. The form fit can be achieved by way of a securing flank, a multiple toothing or for example by way of a square or polygon which forms the receiving opening of the tooth receptacle in the form-fit region shown.

The invention is furthermore directed at a method for arranging a crusher tooth on a crushing roll of a roll crusher, wherein a tooth receptacle having an opening into which the crusher tooth is introduced is arranged on the crushing roll, wherein provision is made of a clamping sleeve which is introduced into the opening counter to the direction of introduction of the crusher tooth and into which a shank of the crusher tooth is drawn with the clamping sleeve being radially braced in the opening, and wherein once the conical shank has been drawn into the clamping sleeve, the clamping device is removed, and a screw-connection element is provided by way of which the braced arrangement of the conical shank in the clamping sleeve is secured. In order to draw the clamping sleeve into the radial, circumferential gap, provision is therefore made according to the invention of a clamping device by way of which the preferably conical shank of the crusher tooth is drawn into the clamping sleeve with a bracing force being applied. Since the tooth head bears with its bearing collar against the bearing rim of the tooth receptacle even before the clamping sleeve is drawn in, the position of the crusher tooth in the tooth receptacle no longer changes and the clamping sleeve can be drawn into the gap between the shank and the opening in the tooth receptacle by way of a movement counter to the tooth receptacle and counter to the crusher tooth. In this case, the opening in the tooth receptacle can be formed in a continuous manner, and the crusher tooth can be introduced into the opening from the first opening side and the clamping sleeve can be introduced into the opening from the opposite, second opening side.

In the simplest case, the clamping device can already be formed by the screw-connection element between the clamping sleeve and the shank of the crusher tooth, but preferably, the clamping device can be embodied in a hydraulic, mechanical or some other manner, and once the conical shank has been drawn into the clamping sleeve, the clamping device can be removed and the screw-connection element, by way of which the braced arrangement of the conical shank in the clamping sleeve is secured, can be inserted. Finally, the opening side through which the clamping sleeve and the screw-connection element have been introduced can also be closed by a cover element.

PREFERRED EXEMPLARY EMBODIMENT OF THE INVENTION

Further measures that improve the invention are explained in more detail in the following text together with the description of a preferred exemplary embodiment of the invention with reference to the figures, in which:

Figure 1 shows an exemplary embodiment of an arrangement of a crusher tooth on a crushing roll with a clamping device, and

Figure 2 shows the arrangement of the crusher tooth on the crushing roll with securing by way of a screw-connection element.

Figure 1 shows an exemplary embodiment of an arrangement of a crusher tooth 10 on a crushing roll 1 of a roll crusher, wherein only a part of the crushing roll 1 is shown. A tooth receptacle 11 is arranged on the outer circumference of the crushing roll 1, and welds 28 are shown by way of example between the tooth receptacle 11 and the surface of the crushing roll 1 in order to fasten the tooth receptacle 11 to the roll 1.

Introduced into the tooth receptacle 11 is an opening 12 which is formed for example in a cylindrical manner and extends in the form of a through-opening through the tooth receptacle 11 in the longitudinal direction 20 shown. A crusher tooth 10 has been introduced into the opening 12 of the tooth receptacle 11 from the direction of a front side of the tooth receptacle 11, which is located at the front in the direction of rotation as per the shown rotation arrow of the crushing roll 1. A clamping sleeve 13 has been introduced into the opening 12 of the tooth receptacle 11 from the direction of an opposite rear side. The crusher tooth 10 has a conically formed shank 14 which extends from the underside of the tooth head 15, wherein the tooth head 15 points in the direction for rotation of the crusher roll 1.

The clamping sleeve 13 encloses the conically formed shank 14 of the crusher tooth 10 in that the shank 14 has been introduced into a receptacle 18 of the clamping sleeve 13. The cylindrically formed outer contour 19 of the clamping sleeve 13 sits in this case in the opening 12 of the tooth receptacle 11.

The tooth head 15 of the crusher tooth 10 has a bearing collar 16 which bears flat against a bearing rim 17 of the tooth receptacle 11, wherein the bearing rim 17 fully encloses the opening 12 in the tooth receptacle 11. If comminution forces act on the tooth head 15, these forces are transferred directly from the tooth head 15 into the tooth receptacle 11 via the bearing collar 16 and the bearing rim 17 without the comminution forces having to be conducted into the tooth receptacle 11 via the shank 14 and the clamping sleeve 13.

In order to receive the clamping sleeve 13 in the gap between the shank 14 and the opening 12, a clamping device 25 is shown, said clamping device 25 having as simplest embodiment a spike 26 and sleeve 27 in order to draw the clamping sleeve 13 into the gap. The spike 26 has been screwed into a threaded bore 33 in the shank 14 of the crusher tooth 10 such that a tensile force can be applied to the shank 14 via the spike 26. The sleeve 27 has been screwed into a thread 29 which is located at the sleeve foot 30 of the clamping sleeve 13. Consequently, tensile and compressive forces can be introduced into the shank 14 and into the clamping sleeve 13, respectively, both via the spike 26 and via the sleeve 27.

In order to draw the clamping sleeve 13 into the gap between the shank 14 and the opening 12, while the tooth head 15 is already bearing against the bearing rim 17 of the tooth receptacle 11 by way of the bearing collar 16, a tensile force is exerted on the spike 26 and a compressive force is exerted on the sleeve 27, wherein the respective forces correspond to the bracing force F. The bracing force F can be applied for example by a hydraulic or mechanical device which is not shown in more detail. The clamping sleeve 13 can in this case be pushed into the gap until the required bracing force F has been achieved. A residual gap 31 between a shoulder 32 in the opening 12 and the sleeve foot 30 of the clamping sleeve 13 ensures that the clamping sleeve 13 does not come into abutment against the shoulder 32 before the bracing force F has been achieved. The shoulder 32 forms a geometric form fit such that the crusher tooth 10 cannot be released from the opening 12 in the direction of rotation of the crushing roll 1.

In order to avoid the buildup of tangential stresses in the clamping sleeve 13, the latter has a slotted embodiment, wherein a longitudinal slot in the clamping sleeve 13 is located in the lower side of the section plane such that, as a result of the slotted embodiment, the lower half of the clamping sleeve 13 is formed by the side face of the slot and so the hatching is omitted.

The described clamping device 25 can furthermore be used to remove the crusher tooth 10 from the receptacle 11 again and in particular from the seat of the clamping sleeve 13. The bracing forces F shown in figure 1 merely have to be reversed, such that a tensile force is introduced via the sleeve 27 and a compressive force is introduced via the spike 26 into the clamping sleeve 13 and into the shank 14 of the crusher tooth 10, respectively, in order to remove the clamping sleeve 13 from its shown seat again.

As an alternative to the shown clamping device 25, the clamping sleeve 13 can also be pushed into the gap between the shank 14 and the opening 12, for example by a tool that engages equally around the crusher tooth 10 and the clamping sleeve 13. In this case, the pulling and pushing is understood as taking place in a relative manner between the crusher tooth 10 and the clamping sleeve 13.

Figure 2 shows the arrangement of the crusher tooth 10 in the tooth receptacle 11 on the crushing roll 1 in a braced arrangement, wherein a screw-connection element 21 is inserted in a screw receptacle 24 in the sleeve foot 30 of the clamping sleeve 13. The screw-connection element 21 has a screw head 23 which is seated in the screw receptacle 24, which at the same time serves for the use of the thread 29 for the arrangement of the sleeve 27, and the screw-connection element 21 furthermore has a screw shank 22 which is screwed in the threaded bore 33 in the shank 14 of the crusher tooth 10. As a result, the screw-connection element 21 braces the clamping sleeve 13 with the crusher tooth 10, such that the bracing force F which has been applied by the clamping device 25 is secured and is maintained. The arrangement of the screw-connection element 21 in the screw receptacle 24 can furthermore be secured by a securing element 34 which is located under the screw head 23 in abutment against the sleeve foot 30 and can be configured for example in the form of a Nord-Lock securing element.

The radially circumferential seat of the crusher tooth 10 in the tooth receptacle 11 can have a form-fit region 35 at the point shown, said form-fit region 35 adjoining the internal region of the bearing rim 17. By way of the form fit, twisting of the crusher tooth 10 in the tooth receptacle 11 can be prevented, and this can be advantageous in particular during operation of the crushing roll 1. The form fit can be achieved by way of a securing flank, a multiple toothing or for example by way of a square or polygon which forms the receiving opening of the tooth receptacle 11 in the form-fit region 35 shown.

The embodiment of the invention is not limited to the merely preferred exemplary embodiment that is given above. Rather, a number of variants are conceivable which make use of the illustrated solution even in fundamentally different embodiments. All of the features and/or advantages which are apparent from the claims, the description or the drawings, including structural details or spatial arrangements, can be essential to the invention both on their own and in a large variety of combinations. In particular, the conical seat of the clamping sleeve 13 does not necessarily have to be formed between the clamping sleeve 13 and the shank 14, because the shank 14 can also be embodied in a cylindrical manner, and so the receptacle 18 in the clamping sleeve 13 is also embodied in a cylindrical manner. In this case, however, the outer contour 19 of the clamping sleeve 13 can be embodied in a conical manner, wherein the conical outer side of the clamping sleeve 13 can correspond to a correspondingly conical opening 12 in the tooth receptacle 11.

List of reference signs I Crushing roll 10 Crusher tooth II Tooth receptacle 12 Opening 13 Clamping sleeve 14 Conical shank 15 Tooth head 16 Bearing collar 17 Bearing rim 18 Receptacle 19 Cylindrical outer contour 20 Longitudinal direction 21 Screw-connection element 22 Screw shank 23 Screw head 24 Screw receptacle 25 Clamping device 26 Spike 27 Sleeve 28 Weld 29 Thread 30 Sleeve foot 31 Gap 32 Shoulder 33 Threaded bore 34 Securing element 35 Form-fit region F Bracing force

Claims

An arrangement of a crusher tooth (10) on a crusher roller (1) of a roller crusher, wherein a continuous tooth holder (11) has an opening (12) in which a crusher tooth (10) can be inserted from a first side and retention is arranged on the crusher roller (1), wherein there is a clamping sleeve (13) which is inserted into the opening (12) from opposite end relative to the insertion of the crusher tooth (10) and wherein a shank portion (14) of the crusher tooth (10) is received with the clamping sleeve ( 13) radially supported in the opening (12), characterized in that a screw connection element (21) is provided which is screwed into the crusher tooth (10) by means of a screw shank (22) and arranged in a screw fitting (24) in the clamping sleeve (13) eg a screw head (23).

Arrangement according to claim 1, characterized in that the crusher tooth (10) has a tooth head (15) formed with a bearing collar (16) for bearing against a bearing ring (17) enclosing the opening (12) of the tooth holder (11).

Arrangement according to claim 1 or 2, characterized in that the shank part (14) is conically shaped and in that the clamping sleeve (13) has a tapered receiver (18), wherein the tapered shaft part (14) of the crusher tooth (10). is embedded.

Arrangement according to claims 1-3, characterized in that the opening (12) in the tooth holder (11) is formed by a cylindrical bore, wherein the clamping sleeve (13) has a cylindrical outer contour (19) by means of said clamping sleeve (13). is embedded in the opening (12),

Arrangement according to any one of the preceding claims, characterized in that the cone of the shaft part (14) and of the receiver part (18) has a cone angle having a value of 0.2 ° -10 °, preferably a value between 1 ° - 5 ° , in particular preferably a value of 2 °.

Arrangement according to any one of the preceding claims, characterized in that the clamping sleeve (13) is formed in a slotted manner and preferably has one or more slits extending at least partially through the clamping sleeve (13) in its longitudinal direction.

Arrangement according to any one of the preceding claims, characterized in that the longitudinal direction (20) of the clamping sleeve (13) forms the axis of rotation of the opening (12), which preferably extends tangentially away from the crusher roller (1).

Arrangement according to any one of the preceding claims, characterized in that the tooth holder (11) is arranged in a radially protruding manner on the crusher roller (1) and in particular is formed integrally thereon or connected thereto in a continuous manner.

A method of arranging a crusher tooth (10) on a crusher roller (1) of a roller crusher according to one of the preceding claims, wherein a continuous tooth holder (11) has an opening (12) into which the crusher tooth (10) can be inserted, the tooth holder (11) is arranged on the crusher roller (1), where there is a clamping sleeve (13) which can be inserted into the opening (12) from the opposite end with respect to the insertion of the crusher tooth (10) and in which a tapered shaft part (14) of the crusher tooth (10) is provided with the clamping sleeve (13) which is radially embedded in the opening (12) and wherein - a clamping device (25) is provided by means of which the tapered shaft part (14) is inserted into the clamping sleeve (13) a stiffening force (F), - when the tapered shaft portion (14) has been pulled into the clamping sleeve (13), a clamping device (25) is removed, and where - there is a screw connection element (21) screwed into the crusher tooth (10). by means of a screw shank (22) and embedded in a screw holder are (24) in the clamping sleeve (13) by means of a screw head (23) and by means of which the stiffening arrangement of the tapered shaft part (14) in the clamping sleeve (13) is secured.