DE3030744A1 - Drum cutter for e.g. spring blank rolled strip - uses actuators to release and move blades into recesses of carrier, then place new blades in drums - Google Patents

Abstract

The arrangement is intended for changing the blades (6) secured between clamp strips (9) and wedge pieces (10) in recesses (8) of the rotary shearing drums (5) for rolled strip material. A carrier can be lowered in front of the two drums and has pairs of recesses (47,48) facing the drums, whose bottom surfaces can be aligned with the respective horizontal planes through the drum axes. Each drum contains actuated elements to release the wedge pieces and move the blades from the drum recesses whilst each recess is provided with an actuated latch to locate the replacement blades (7). An actuated swivel lever (53,55) can move the blades into the drum recesses.

Description

System for changing the knife sets on rotating

Drum shears for rolled strip The invention relates to a system for Changing the knife sets on rotating drum shears for rolled strip, which the knife blocks in recesses on the circumference of the knife drums between feed strips and clamping wedges sit as well as via tie rods engaging the clamping wedges Energy storage device, e.g. B. springs, are automatically fixable in the recesses.

With drum shears for cropping and / or cross-cutting of rolled strip is it is often necessary to change the knife sets, e.g.

when worn knife blocks are exchanged for new knife blocks Need to become. This removal and installation work for the knife sets require relatively long downtimes of the drum shears, because they are mainly manual, that is must be carried out cumbersome and time-consuming.

In many cases it is necessary to carry out this assembly work, the entire drum set either in the vertical direction from the scissor stand to expand or to close it by sliding it sideways from the scissor stand bring.

So that the effective downtimes of the drum shears on one Minjmum can be held, one has the drum scissors a second right, u1 with One-house pieces L1yediit, so that when you remove one, the worn knife sets having drum set the second, equipped with new sets of knives Drum set is available. The exchange the knife blocks on the knife drums can therefore be done in the workshop, while the The drum shears are equipped and operated with the other drum set.

Apart from the fact that by assigning two drum sets to each drum shear a considerable investment is required, can thereby the manual assembly work required for changing the knife blocks is not carried out be reduced.

The purpose of the invention is this, the utility value of the drum shears to avoid impairing defects. Therefore, the aim of the invention is a system for changing the knife sets on rotating drum shears for rolled strip of the type mentioned to create the changing of knife sets, namely especially the removal and installation of the knife blocks directly on the drum shears made possible with built-in drum set and works largely mechanically, manual activities are therefore limited to a minimum.

The basic solution to this problem is provided by the first Claim specified labeling features achieved.

The advantage here is that the knife can be changed in the shortest possible time and requires minimal manual assistance at best.

So that the change of the knife sets is quick, so without essential Loss of time can be carried out, the use of those indicated in claim 2 has also been found Proven features. The new set of knives can already be used in the Spend drum shears before removing the used knife set from the Knife drums takes place. Immediately after this used set of knives the knife drums is removed, the new set of knives can therefore be inserted into them will.

Structural design features, which the exact allocation and alignment of the mobile or portable part of the knife changing system proposed in claims 3 to 6. On the other hand, there are important design features according to the invention for the parts of the knife changing system that are directly assigned to the scissors shown in claims 7 to 13.

In claims 14 and 15 are further design features for the mobile or portable part of the knife changing system shown while in claims 16 to 18 special training features for the knife sets highlighted will.

Further features and advantages of a knife changing system according to the invention are explained below with reference to a drawing. Figure 1 shows in side view and partly in section a drum shear, with which the mobile or portable Part of a knife changing system is brought into operative connection, Figure 2 is a view the drum shears with knife changing system in the direction of arrow II in FIG. 1, FIG 3 a plan view of the drum shears and the associated knife changing system, FIG. 4 shows, on a larger scale and in more detail, the in FIG. 1 with IV marked partial area, FIG. 5 shows a partial view of FIG. 4 in the direction of the arrow V, Figure 6 shows a cross section through a single knife drum in the area of a Knife block attachment, Figure 7 further details of the knife block attachment According to FIG. 6, FIG. 8 a section along the line Vill-VIll in FIG. 7, FIG a cross section through a knife block attachment in relation to FIGS. 6 and 7 modified embodiment and FIG. 10 a cross section through a single knife drum With the knife block removed, in the area of the knife block extension device <j.

In Figs. 1 to 3 of the drawings, the basic structure of a rotating Drum shears 1 shown with an associated system 2 for changing the knife sets.

The two scissor stands 3 'and 3 "are at the top by a head traverse 4 connected to each other and are used to support the two knife drums 5 'and 5 "of the rotating drum set 5.

A knife block 6 'is built into the knife drum 5' while there is a corresponding measuring block 6 "in the cutterhead 5", with the Knife blocks 6 'and 6 "form the knife set 6, which with synchronous rotation of the Knife drums 5 'and 5 "of the drum set 5 make the cropping or separating cuts on the rolled strip carry out.

Since the knife blocks 6 'and 6 "of the knife set 6 by the operation of the drum shears 1 over time, it is necessary to use the knife set 6 for the purpose of sharpening or regrinding its knife blocks 6 'and 6 ". So that the drum shears 1 also in operation during the reworking on the knife set 6 can be taken, it is assigned a second knife set 7, its knife blocks 7 'and 7 "do this into the knife drums 5 'and 5 "of the drum set 5 can be installed.

The knife drums 5 'and 5 "of the drum set 5 are on their periphery provided with a recess 8 'or 8 ", in each of which a knife block 6' or 7 'or 6 "or 7" is used. The definition of the respective knife block 6 'or 7' or 6 "or 7" in this recess 8 'or 8 "takes place with the interposition a lining strip 9 'or 9 "via a clamping wedge 10' or 10", on which in turn Attack fasteners that are in the cutterhead 5 'or 5 "their abutment Find.

4 makes it clear that the recesses 8 'and 8 "are not directly are limited by the knife drums 5 'and 5 ", but rather within Inserts 11 'and 11 "are located, which in turn are fastened in the knife drums 5' and 5" are.

From Fig. 6 it follows - using the example of the knife block 6 ″ like that Knife blocks 6 ', 6 "or 7', 7" with the associated lining strips 9 ', 9 "by screws 12 are rigidly but detachably connected, and how on the other hand the clamping wedges 10 'or 10 ", also via screws 13, with the interposition of a spring 14, in particular a disc spring column are held displaceably on the lining strip 9 'or 9 ". To secure against displacement, the clamping wedges 10 'or 10 "engage with a rear one Insert the spring strip 15 into a groove 16 in the lining strip ~ 9 'or 9 ".

The fastening elements for the individual knife blocks 6 ', 6 "or 7 ', 7 "in the knife drums 5', 5" can be seen from FIGS. 6 to 9. According to 6 and 7 are here in the knife drums 5 'and 5 "tie rods 17 displaceable out, which have a hammer head 18 at their front end (Fig. 7), while at its rear end with the interposition of an adjusting device 19 a powerful Disc spring column 20 engages, inside the cutterhead 5 ' or 5 "has its abutment.

A hydraulic cylinder acts with the rear end of the pull rod 17 21 together, which is housed within the cutterhead 5 'or 5 ", namely in such a way that when it is subjected to pressure medium, it passes through the disc spring column 20 on the tie rod 17 acting tension force is counteracted.

The piston rod 22 of the hydraulic cylinder cooperating with the pull rod 17 21 is arranged in the hydraulic cylinder 21 so as to be rotatable by at least 90 °, with its Rotation made both manually and by a special power drive can be. The front end of the piston rod 22 comes over a driver attachment 23 in a driving groove 24 at the rear end of the pull rod 17 engaged so that when the piston rod 22 is rotated, the pull rod 17 also rotates a corresponding angle executes around its longitudinal axis. As a result, the hammer head 18 is within a recess 25 of the clamping wedge 10 'or

10 "rotatable in such a way that it is either round with the cross-section Channel 25 'can be brought into cover position, or in the one in front of it Engages undercut area 25 ".

It can also be seen from FIG. 7 that the pull rod 17 is the lining strip 9 'or 9 "extends through, for which purpose this is provided with an opening 26, the Cross-sectional profile coincides with that of the channel 25 '.

The hammer head 18 takes the pull rod 17 within the recess 25 enters the rotational position shown in FIG. 7, it engages behind the undercut area 25 "of the recess 25.

When the pull rod 17 is then relieved of the hydraulic cylinder 21, the disc spring column 20 can develop its tensioning force and thereby pulls the tensioning wedge 10 'or 10 "in the recess 8' or 8" of the cutterhead 5 'or 5 "with a large Force into it Overcoming the restoring force of the springs 14 is thus the clamping wedge 10 'or 10 "in the direction of the lining strip 9' or 9 "pulled and thus clamped the knife block 6 'or 6" or the knife block 7 'or 7 "securely in position in the recess 8' or 8" of the respective knife drum 5 'or 5 ".

If the hydraulic cylinder 21 is acted upon, then the pull rod 17 overcome the tension force of the disc spring column 20 and the restoring force of the Spring 14 released. The spring 14 presses the clamping wedge 10 'or 10 "in the direction away from the lining strip 9 'or 9 ", so that the bracing for the knife block 6 'or 6 "or 7' or 7" releases in the recess 8 'or 8 ". Is now through Rotation of the piston rod 22 of the hydraulic cylinder 21 by 900 also the pull rod rotated by the appropriate angle, then comes the hammer head 18 of the pull rod 17 of the undercut areas 25 "of the recess 25 in the clamping wedge 10 'or 10 "free, so that the knife block 6 'or 6" or 7' or 7 "together with the associated Lining bar 9'1 9 "and the associated clamping wedge 10 'or 10" from the recess 8 'or 8 "of the cutterhead 5' or 5" can be pushed out.

Pushing out the individual knife blocks 6 'or 6 "or 7' or 7 "from the recesses 8 'and 8" of the knife drums 5' and 5 "are also hydraulic cylinders 27 useful, which are housed in the relevant knife drum 5 'or 5 ", as can be seen from FIG. The piston rod 28 of this hydratial cylinder 27 acts on the rear end of a push rod 29 ', which with its front End on the back of the feed bar 9 'or 9 "of the respective knife block 6', 6 "or 7 ', 7" acts. After loosening the knife block fastening by means of the appropriate The hydraulic cylinder 21 can then be actuated by subsequent application the hydraulic cylinder 27 the relevant knife block from the recess 8 'or 8 "of the cutterhead 5 'or 5" can be pushed out.

The connection of the hydraulic cylinders 21 and 27 to those for their operation necessary pressure medium supply source can be easily obtained with the help of Quick-release hose couplings are made when the knife drums are at a standstill in 5 'and 5 "can be attached manually.

For the rotary drive of the piston rod of the hydraulic cylinder 21 can a hydraulically operated actuator can also be used. It would be conceivable but also, the piston rod 22 manually with the aid of a corresponding Schiüsse3s to operate.

One of the embodiment according to FIGS. 7 and 8 different Training for the knife block attachment is also shown in FIG. In this The case has the piston rod 17 at its front end instead of the ijammerkopfes 18 a circumferential turn 29, so that before this circumferential turn 29 a collar 30 is formed. On diesel, collar 30 can be a clutch claw from the side 31 with an undercut area 32 open on one side.; Slide, whereby they with a shoulder 33 delimited by a radially open slot 1> in the circumferential rotation 29 intervenes. while the coupling claw 31 is from an upwardly open pocket 34 of the clamping wedge 10 'or 10 "added and when the clamping force is released Disk spring column 20 in the axial direction over a neck 35 in a recess 36 of the Clamping wedge 10 'or 10 "centered and fixed.

With this fastening device there is one rotation of the pull rod 17 about its longitudinal axis for Kuplveln or uncoupling of the fastening device necessary; instead it is necessary, when changing the Mcs; crsatzc 6 resp. 7 to manually lift or use the coupling claws 31.

As the power-operated clamping, loosening and pushing out of the knife blocks 6 ', 6 "of the knife set 6 or the knife blocks 7'7" through the into the knife drum 5 'and 5 "of the drum set built-in organs or aggregates alone The drum shears are not sufficient for a problem-free and quick knife change 1 nor the mobile or portable part of the system 2 for changing the knife sets 6 and 7 assigned.

This portable or mobile part of the system 2 to change The knife blocks 6 and 7 are lifted by means of a hoist, for example the one in the rolling hall Existing crane can be transported and can be used with its help in case of need from above with its base frame 37 on the head cross member 4 of the scissor stand Set 3 ', 3 ", as can be seen from FIGS. 1 to 3. To secure the position the base frame 37 can be locked on the cross member 4.

The base frame 37 carries a horizontally adjustable slide 38, which can be displaced to a limited extent by a hydraulic cylinder 39. The Carriage 38 vertical guide tracks 40 in which another carriage 41 is held. is, the chain drives 42 carried by tom carriage 38 are raised and lowered can. A hydraulic motor can be used as the drive device for the chain drives 42 43 come into use, which is also seated on the slide 38.

The carriage 41 consists of two vertical bars 44 ', 44 ", the by means of a plurality of transverse pieces 45, formed for example by tubes, at a distance from one another are held and firmly connected to each other and each via guide rails. 46 ' and 46 ″ engage in the guide tracks 40 on the slide 38.

Each of the two bars 44 'and 44 "of the vertically movable carriage; 41 has two pairs 47 and 48 of pockets 47 ', 47 "and 48', 8 aiif that follow the the longitudinal side surfaces of the spars 441, 44 "facing the knife drums 5 ', 5" are open are, dz n then J. 1 tld 4 can be taken.

The outline of the pockets 4-7 ', 47 "and 48', 48" is largely on the cross-sectional shape of the knife blocker 6 ', 6 "and 7', 7 "and the lining strips 9 ', 9" and the clamping wedges 10', 10 "existing structural units Voted.

The distance between the two pockets 47 'and 47 "of the pocket pair 47, as well as the distance between the two pockets 48 'and 48 "of the pocket pair 48 (corresponds to the distance between the rotation; axes of the two Knife drums 5 'and 5 "of the drum sate 5, like that readily shown in FIGS. 1 and 4 can be found. It can also be seen from these figures that the e Pockets 47 'and 48' as well as 47 "and 48" of the two pairs of pockets 47 and 48 alternately lie one below the other, so that the pocket 48 'of the pocket pair 48 between the two Pockets 4 / 'and 47 "of the pair of pockets 47 lies, while the pocket 48" of the pair of pockets 48 is located below the pocket 47 ″ of the pocket pair 47.

When changing the knife set on drum shears 1 is to be, is initially movable when not yet on the drum shears or mobile part of the knife changing system 1, a new knife set 7 into the Spars 44 'and 44 "of the carriage 41 located pockets 48' and 48" of the pocket pair 48 used and secured in position with the aid of latches 49 'and 49 "which are attached to the Inside of the spars 44 'and 44 "are pivotably suspended and by means of spring tensioning cylinders 51 'and 51 "can be actuated, as can be seen from FIGS. 4 and 5, then becomes the mobile or portable part of the system 2 for changing the pairs of knives placed by means of the indoor crane on the head cross member 4 of the drum shear 1 and regulated on this via the base plate 37. The carriage 41 then initially takes the elevation shown in FIGS. 1 and 2, at which the spars 44 'and 44 "as a whole above, the drum set 5 of the drum shears 1 are located.

After the last cropping or separating cut with the drum shears 1 has been carried out, the slide 41 or

its spars 44 ', 44 "are fully extended through h Lines from Fig. 1 apparent position shut down.

The pockets 47 ′ and 47 ″ of the empty pocket pair 47 arrive with their base on the plane of the axes of rotation of both cutter drums 5 ' and 5 ". The knife drums 5 'and 5" in their zero position corresponding to FIG are brought and locked, the carriage 41 or

can its spars 44 'and 44 "by moving the horizontal slide accordingly 38 can be moved close to the drum circumference via the hydraulic cylinder 39. The base areas of the pockets 47 ′ and 47 ″ of the pocket pair 47 then grasp under the two knife blocks 6 'and 6 ". If the Knife block attachment described is loosened and unlocked, then you can then the knife blocks 6 'and 6 "with their lining strips 9' and 9" and their clamping wedges 10 'and 10 "by the push-out device already described with reference to FIG out of the recesses 8 'and 8 "of the knife drums 5' and 5" and into the pockets 47 'and 47 "of the spars 44' and 44" are inserted. After this is done the load pawls 50 'and 50 "assigned to the pockets 47' and 47" are released, so that they ken behind the knife blocks through the action of their spring tensioning cylinders 52 'and 52 " get into the blocking position and prevent it from being pushed out of the pockets 47 'and 47 " to back up.

The carriage 41 or the bars 44 ', 44 "are then passed through the chain drives 42 raised so far that the base of the pockets 48 ' and 48 ″ of the pair of pockets 48 on the same el> ene with the axes of rotation of the knife drums 5 'and 5 "have been achieved. If this has happened, then those shown in FIGS. 4 and 5 are pivoting levers 53 'each mounted on the outside of the two bars 44' and 44 " and 53 "from their rest position from left to right by the also on the Outside of the bars 44 'and 44 "arranged hydraulic cylinders 54' and 54" moved, so that they are in the pockets 48 'and 48 "of the pocket pair 48 knife blocks 7 'and 7 "of the knife set 7 after lifting the latches 4)' and 49" in the Cutouts 8 'and 8 "of the knife drums Slide in 5 'and 5 ". Now only need knife fastening devices according to FIGS. 6 to 9 to be brought into their operative position to the knife blocks 7 'and 7 "of the new knife set 7 functionally correct and safe in the knife drums 5 'and v " of the drum shears 1.

Before the drum shears 1 is put back into operation, only need the quick-release hose couplings for those in the knife drums 5 'and 5 " Hydraulic cylinders 21 and 27 released and the mobile or portable part of the system 2 to change knives must be moved up to the starting position and / or with be transported away with the overhead crane.

It should also be noted that the pockets 47 'and 47 ″ the spars 44 'and 44 "are assigned pivot levers 55' and 55", which are controlled by hydraulic cylinders 56 'and "can be moved.

Swivel lever movable by hydraulic cylinders 56 'and 56 " 55 'and 55 "work in a similar way with latches 50' and 50" together, like the pivot levers 53 'and 53 "with the locking pawls 49' and 49". So it is also possible to close the pockets 47 'and 47 "of the pocket pair 47 with new knives occupy that inserted into the recesses 8 'and 8 "of the knife drums 5' and 5" must be and instead the pockets 48 'and 48 "of the pocket pair 48 as To use empty pockets to hold the used sets of brass.

Finally it should be mentioned that it is z: angular, also the hydraulic unit to operate the vel different actuators in the mobile part of the system 2 for To integrate knife change, with the knife rommf ln 5 'and 5 " Hydraulic lines to be connected from this via the hose quick couplings Hydraulic unit would be fed.

Structure and mode of operation of the above-described system for exchange The knife sets on rotating drum shears for rolling stock are designed in such a way that that the operations required for changing the knife are largely automated are carried out and only the control processes for starting the individual work it positions to be triggered by hand, for example by actuating switching and control elements are.

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Claims (18)

Claims bJ system for changing the knife sets on rotating Drum shears for rolled strip, in which the knife blocks in recesses on the circumference of the knife drums sit between the chuck bars and the clamping wedges as well as on the Fastening elements engaging clamping wedges can be fixed in the recesses, characterized by the shear stand (3 ', 3 ") from the head traverse (4) both knife drums (')', 5 ") lowerable bars (44 ', 44"), which correspond to the center distance of the two knife drums (5 ', 5 ") arranged in pairs (47 and 48) Pockets (47 ', 47 "and 48', 48") in those facing the knife drums (5 ', 5 ") Have longitudinal side surfaces and with their base surfaces on the axial planes of the two Knife drums (5 ', 5 ") can be aligned, and on the one hand by the fact that in each Knife drum (5 'and 5 ") at least two power-operated actuators (21 and 27) one of which (21) acts as a release device for the clamping wedges (10 ', 10 ") the knife blocks (6 ', 6 "or 7', 7") with their fastening elements (17 to 20 or 17, 30, 31) can be coupled (22 to 24), while the other (27) is a device (28, 29) for pushing the loosened knife blocks (6 ', 6 "or 7', 7") out of the Forms pockets (47 ', 47 "or 48', 48"), and on the other hand in that each pocket (47 ', 47 ") and (48', 4EI") on the bars (44 ', 44 ") a power-operated (51', 51" or 52 ', 52 ") latch (49', 49" or 50 ', 50 ") as a position securing device for the knife block (6 ', 6 "or 7', 7") in the pocket (47 ', 47 "or 48', 48") and a likewise power-operated (54 ', 54 "or 56', 56") pivot lever (53 ', 53 " or 55 ', 55 ") as a device for inserting the knife block (6 ', 6 "or 7 ', 7") assigned to the recess (8', 8 ") of the knife drum (5 ', 5") is. 2. Installation according to claim 1, characterized in that on the spars (44 ', 44 ") two pairs (47 and 48) of pockets (47', 47" and 48 ', 48 ") one above the other are arranged, with one pair of pockets (e.g. 48) holding the receptacles for the Knife set (7) and the other pair of pockets (e.g. 47) are the receptacles for the one to be removed Knife set (6) forms. .3. Plant according to one of Claims 1 and 2, characterized in that that the spars (44 ', 44 ") sit on a vertically movable carriage (41), the in turn rests on a horizontally adjustable carriage (38), which of a Base frame (37) that can be placed on the head cross-member (4) of the scissor stand (3 ', 3 ") is held. 4. Plant according to one of claims 1 to 3, characterized in that that the spars (44 ', 44 ") are held at a distance from one another by cross pieces (45) and are firmly connected to each other and even the vertical guides (40) of the horizontal slide (38) movable (46, 47) slide (41) which is adjustable via chain drives (42) relative to the horizontal slide (38). 5. Plant according to one of claims 1 to 4, characterized in that that the horizontal slide (38) relative to the base frame (37) via hydraulic cylinders (39) is adjustable. 6. Plant according to one of claims 1 to 5, characterized in that that the base frame (37) can be locked on the head traverse (4) of the scissors stand (3 ', 3 ") is. 7. Plant according to claim 1, d a d u r c h g e k e n n z e i c h n e t that the power-operated actuators (21 and 27) in the knife drums (5 ', 5 ") ouch Hydraulic cylinders exist, which when the measuring drums (5 ', 5 ") are at a standstill Hoses and quick-release couplings. In the line of an external pressure medium supply source are connectable. 8. Plant according to claim 1, d a d u r c h g e k e n n z e i c h n e t that the fastening means for the clamping wedges (10 ', 10 ") consist of tie rods (17) exist, which are detachably coupled to the clamping wedges (10 ', 10 ") (18, 25, 25', 25 "or 30, 31, 35, 36). 9. Installation according to claim 8, characterized in that the tie rods (17) carry a hammer head (18) at its front end, which is inside a sideways undercut (25 ") Riecjel recess (2r3) of the clamping wedge by 900 between a coupling (25 ") and a decoupling position (25 ') is rotatable. 10. Plant according to one of claims 1 and 7 to 9, characterized in that that the piston rod (22) of the pull rod (17) assigned as an actuator hydraulic cylinder (21) arranged to be rotatable, but non-rotatably coupled to the pull rod (17) (23, 24). 11. Plant according to one of claims 1 and 7 to 10, d a d u r c h it is not indicated that the piston rod (22) is manual or power driven rotatably provided and axially displaced with the rear end of the drawbar (17) can be engaged and disengaged (23, 24) in a rotationally fixed manner. 12. Plant according to claim 8, characterized in that the pull rod (17) has a stepped collar (30) at its front end, into which one laterally undercut (32) which can be inserted into a pocket (34) of the clamping wedge (10 ', 10 ") Coupling claw (31) can be engaged, which by limited axial displacement in the pocket (34) of the clamping wedge (10 ', 10 ") can be locked and unlocked (35, 36). 13. Plant according to one of claims 1 and 7, characterized in that that the push-out device for the knife block (6 ', 6 "or 7', 7") forms Actuator (27) one between the piston rod (28) of the hydraulic cylinder (27) and the recess (8 ', 8 ") on the knife drum circumference arranged push rod (29) having. 14. Plant according to claim 1, d a d ti r characterized in that the Position securing device forming latches (49 ', 49 "or 50', 50") Spring tensioning cylinder (51 ', 51 "or 52', 52") and used as an insertion device for the knife blocks (6 ', 6 "or 7', 7") serving pivot levers (53 ', 53 "or 55', 55 ") can be actuated by hydraulic cylinders (54 ', 54" or 56', 56 "). 15. Plant according to one of claims 1 and 14, characterized in that that the latches (49 ', 49 "and 50', 50") with the associated Spring tension cylinders (51 ', 51 ") or (52', 52") sit on the inside of the spars (44 ', 44 ") while the pivot levers (53 ', 53 "and 55', 55") with the associated hydraulic cylinders (54 ', 54 "and 56', 56") are arranged on the outside of the spars (44 ', 44 "). 16. Plant according to claim 1, characterized in that each knife block (6 ', 6 "or 7', 7") and each clamping wedge (10 ', 10 ") with the associated lining strip (9 ', 9 ") is detachably connected (12, 13), e.g. screwed. 17. Plant according to one of claims 1 and 16, characterized by d a d u r c h, that the clamping wedge (10 ', 10!') can be displaced to a limited extent with the interposition of spring columns (14) is connected to the lining strip (9 ', 9 "). 18. Plant according to one of claims 1, 16 and 17, characterized in that that the clamping wedge (10 ', 10 ") via tongue and groove (16, 15) with the Lining bar (9 ', 9 ") is engaged.