EP3248687B1 - Two-shaft shredder having quick change device - Google Patents

Description

Field of the invention

The invention relates to a comminution device, comprising: two comminution shafts arranged parallel to one another and having comminution elements arranged thereon, wherein the comminution shafts are preferably rotatable in a mechanically synchronized manner with respect to each other; a shaft-side coupling member connected to a respective first end of the crushing shafts; and a housing having a housing-side coupling element which can be coupled to the shaft-side coupling element.

So-called twin-well shredders enjoy a wide application in the comminution of various input materials. These twin-shaft shredders differ from so-called single-shaft shredders in that they have two shredding shafts. The crushing itself is done with the tools on the two shafts to each other, but also against fixed crushing tools.

Not to the design of these two-shaft crushers include the so-called rotary shears, even if they have two crushing shafts. Rotary shears have only so-called cutting discs have the gaps. In the gaps passes the material to be shredded, which is actually cut by the disc of the other wave. The rotary shears have no shredding tools that extend beyond the width of the cutting discs.

Although the two-shaft shredder discussed here also have discs or support elements, only these carry additional crushing tools, so-called separating elements, which protrude considerably, up to the width of the disc on one side, across the width or thickness of the discs.

For the most part, such two-shaft shredders are used in the waste and recycling industry and in the field of biomass. For example, for shredding household waste, commercial and production waste of various kinds, Construction site waste, waste wood, green waste and other biomass, but also with iron and other metal scrap.

These two-shaft shredders are differentiated according to a further decide criterion. And whether the two shredding shafts are driven in such a way that they can only rotate synchronously or asynchronously around their own axis with the shredding tools.

For twin-shaft shredders with asynchronous drive, both shredding shafts can be operated with different speeds and directions of rotation. With synchronously driven two-shaft shredders, comminution shafts rotate only in synchronous speed and in opposite directions, so the two comminution shafts move towards each other at the same speed or move away from each other.

This synchronous drive of twin-shaft shredders allows a completely different arrangement of the crushing tools on the crushing shafts than with twin-shaft shredders with asynchronous drive.

With asynchronous drive of the crushing shafts, the crushing tools located thereon must be designed so that a mutual contact and thus damage the crushing tools is excluded because the waves can rotate in different rotational speed and direction.

In contrast, with two-shaft shredders with synchronous drive, the crushing tools can be formed so that the tools of the two shafts interlock, and each of the tools of one shaft, with the tools of the other shaft, perform the crushing, there by the synchronous drive of the crushing shafts, at correct execution of shredding tools mutual damage can be excluded.

By this technical feature of the twin-shaft shredders with synchronous drive, once a higher degree of comminution of the input materials is possible, as well a more uniform piece size is achieved by the sieve-like action of the crushing tools on both shredding shafts, than in asynchronously driven twin-shaft shredders.

The two-shaft shredders described further here are therefore exclusively those with synchronous drive of the two comminution shafts.

State of the art

These twin-shaft shredders with synchronous drive of the shredding shafts have the in Fig. 1 apparent main components of shredding tools. These include the two crushing shafts 1 and 3 with the coupling halves 5 and 7. The two shafts have so-called support elements 9 and 11 which carry the actual comminution tools. As the Fig. 1 shows that are once dividing elements 17 and 19 and the fangs 13 and 15. The main body of the crushing shafts 1 and 3 have additional separating elements 21 and 23rd

The Fig. 2 shows only by way of example from the patent application PCT / EP2013 / 066682 (published as WO 2014/026916 A1 ) Two complete shafts with 8 pcs. Support disks 9 and 11 per shaft 1, and with 8 dividers 17 and 19 per support disk 9 and 11. The number of support disks 9 and 11 per shaft 1, and the number of separating elements 17 and 19 each Support disk 9 and 11, and thus also the counterpart separation elements 21 and 23, is variable over a larger range. Thus, shafts 1 at a smaller wavelength and a small support disk diameter from four support disks 9 and 11 with only three separating elements 17 and 19 per shaft 1 in use. Or at a larger wavelength 1 and 3 and larger pulley diameter 9 and 11, up to twelve support disks 9 and 11, each with up to twelve dividing elements 17 and 19 per shaft 1 and 3 in use. Similarly, the number of fangs 13 and 15 on the support disks 9 and 11 and the number of counterparts 21 and 23 on the shaft main bodies of the shafts 1 and 3 is changed.

Another crushing main element in Fig. 1 This two-shaft shredder is the so-called counter rake 31 and 32 of the tines 33 and 34 most different Embodiment is provided. This counter rake is part of such two-shaft shredders. This counter rake once has the task to strip shredded material, which has accumulated between the support disks 9 and 11 of the two shafts 1 and 3 during comminution. This is to prevent a once crushed material from getting back between the crushing waves, and is crushed by these again. Since the two waves reversed in blockages, so change the direction of rotation of each other to each other, uncrushed material would pass from the cutting chamber in the output stream of the crushed material. This should be prevented with the counter rake 31 and 32.

The third comminuting element is the regrooving rake 35, which is also referred to as a post-breaking bar. This Nachschneiderechen 35 there are depending on the crushing task in various embodiments. The two-shaft shredder described here need not be formed with this Nachschneiderechen. The Nachschneiderechen 35 also carries additional elements 36. Their training is different according to the task of comminution. The task of Nachschneiderechens 35 is to comminute the input material after crushing by the separating elements 17 and 19 of the shafts 1 and 3 in addition, and already shredded material before the counter rake 31 and 32 strip. In the case of wood and other breakable materials, the reaming rake 35 is subjected to additional comminution by breaking, from which the further term breaking bar also originates. The job of the reaming rake is to provide a smaller and more uniform output grain from the shredder.

All these three elements of two-shaft shredder, consisting of the two shafts 1 and 3, the two coupling shafts 5 and 7, the two counter rakes 31 and 32, and the Nachschneiderechen 35, referred to as a so-called wave system, are as out Fig. 3A can be seen in a complete only down and up open crushing housing 40, with the end walls 41 and 42, and the side walls 43 and 44 installed. The two shafts 1 and 3 are preferably mounted on one side in the end wall 41 of the crushing housing 40, and supported on the other hand preferably by mechanically almost rigid couplings 5 and 7 from the located on the other side end wall 42 gearbox. The counter rakes 31 and 32 are fixed to the side walls 43 and 44, respectively. The reaming rake 35 is fixed between and under the two shafts 3 and 5 on the end walls 41 and 42 of the crushing housing 40. The two lateral transfer chutes 45 and 46 are permanently attached to the crushing housing 40, and allow from these two sides also no access to the shaft system.

As the construction and the description according to the prior art of such synchronously driven twin-shaft shredders shows, they can be used very universally and economically for a variety of crushing tasks. For every shredding task of the various input materials, the desired final grain size, the required throughput, a suitable shaft system is available. The execution of all crushing components, the shaft system consisting of the shafts 1 and 3, the counter rake 31 and 32 and the Nachschneidrechen 35, can be adjusted according to the crushing task.

Unfortunately, this is not done by the operators of such twin-shaft shredders to the extent that would be technically feasible, but in part seems not economically feasible. Since the removal and replacement of the shafts 1 and 3, with counter rake 31 and 32, and the Nachschneiderechen 35, claimed too much time of the service staff, is dispensed with the otherwise economically viable remodeling on a more suitable for the task of crushing wave system, and the two-shaft shredder continued to operate with the unsuitable for the particular task of shredding shaft system.

By the following example, the scope of work of the present state of the art in use two-shaft shredder when removing and reinstalling the crushing shafts 1 and 3, while maintaining the number of support members 9 and 11, but the change in the number or type of separating elements 17 and 19, and the use of the same Nachschneiderechens 35, described in detail. All the following specific figures are exemplary of a two-shaft shredder of medium size.

First, the so-called front movable funnel wall 47, which is fastened to the crushing housing 40 and to the front end wall 41, has to be removed become. For this purpose, a hoist is required because the movable funnel wall of about 450 kg manually remove, does not allow the weight.

Then, with a suitable hanger and hoist the Nachschneiderechen 35 is lowered onto the conveyor belt located below the shredder. For this purpose, once the service personnel have to go under the crushing housing 40 on the discharge belt lying on his back, and attach the hanger of the hoist on Nachschneiderechen 35. Then, the attachment between the Nachschneiderechen 35 and the end walls 41 and 42 must be solved. Subsequently, the Nachschneiderechen 35 can be lowered onto the underlying conveyor belt with a hoist.

As a further step, 20 pcs. Of screws 50 of the two bearing housings 50 of the shafts 1 and 3 have to be removed from the end wall 40 and bearing yoke 51. Subsequently, the screws 52 of the bearing yoke 51 can be removed, and thus then the bearing yoke 51 can be removed with a hoist.

As a next step, the two counter rakes 31 and 32 are removed from the shredding case 40. For this purpose, 32 screws 30 with which the counter rake 31 and 32 are fixed to the side walls 43 and 44 together must be removed. Then the counter rakes 31 and 32 can be lifted with hoist from the crushing housing 40.

Then the two waves 1 and 3 are freely accessible. The shafts are then separated by a suitable device or hanger 53 from the mechanically nearly rigid couplings 4. This is done by moving the shafts 1 and 3 in the direction of the end wall 41. As a result, the coupling halves 5 and 7 are separated from the shaft, from the coupling halves 6 and 8 on the transmission of the clutches 4. Then, the shafts 1 and 3 can be lifted with the hanger 53 from the crushing housing 40.

The replacement of another or the same repaired shaft system with the two shafts 1 and 3, the two counter rake 31 and 32 and the Nachschneidrechen 35 then takes place in exactly the reverse order, as the procedure described here for the expansion of the shaft system.

Here, the sliding of the two shafts 1 and 3, with the coupling halves 5 and 7 of the waves on the counterpart of the coupling of the coupling halves 6 and 8 on the gearbox, very laborious, time-consuming and is subject to a high risk of injury, since the correct position of the waves the coupling halves 5 and 7 to each other, as well as to the counter-couplings 6 and 8 on the gearbox of the synchronous drive, it is difficult to find because the coupling halves have a very low clearance play each other.

In addition, however, there is a considerable expenditure of time for the assembly and the proper alignment of the bearing housing 49 of the shafts 1 and 3 with the screws 50 on the end wall 41 and bearing yoke 51 when the two shafts 1 and 3 inserted into the crushing housing 40 and the bearing yoke 51 are attached.

As a time expense in the average size of the twin-shaft shredders, with e.g. a wavelength of about 1800 mm and a circle diameter of the shafts 10 of e.g. about 650mm, and a total weight of about 2,200 kg, are for the expansion of the shafts 10 and the replacement, with unchanged retention of the same Gegenrechens 15 and Nachschneidrechen 17, at least between 6-8 hours with 2 service people required, ie between 12- 16 man hours.

For the larger size two-shaft shredders, e.g. a wavelength of 2700mm, and a circle diameter of e.g. about 950mm, and a total weight of about 8,500 kg, at least 12-16 hours with 3 servicemen required, so between 36-48 man hours.

If not only the shafts 1 and 3 are exchanged by removal and replacement, but also the counter rakes 31 and 32 and the Nachschneiderechen 35 is exchanged, extend the periods specified here of the service personnel only slightly, since the counter rake 31 and 32 and the Nachschneiderechen 35, always have to be mined.

This not inconsiderable expenditure of time, makes many of the advantages described here of this synchronously driven twin-shaft shredder again canceled out. Since once the times for the exchange of the wave system as a production time of the twin-shaft shredder is missing, as well as the costs for the service staff for the shaft replacement spend trying to avoid largely.

As a result, the operators of such synchronously driven twin-shaft shredders often fail to install the shaft system that is most suitable for the respective shredding task. Instead, an unsuitable shaft system attempts to cope with the shredding task, with significantly more time and wear on the unsuitable shaft system.

The situation is similar with the maintenance intervals for processing the shaft system by the wear caused by the operation. Here, too, the wave system works far beyond the actual required maintenance intervals, since it again shuns the time and costs for shorter maintenance intervals. Instead, work is being done beyond the maintenance interval with the twin-shaft shredders, although this inevitably requires less throughput and thus longer processing times, and also disproportionately high further wear on the shaft system, which then requires significantly higher refurbishment costs on the shaft system.

In the same way, the situation with damage to the shaft system. Of course, it is inevitable by the entry of impurities that it comes to the dividing elements 17 and 19 or to the fangs 13 and 15 to breakouts. Damage to the tines 33 and 34 of the counter rake 31 and 32 can not be excluded, as it sometimes comes to damage to the Nachschneidrechen 35 and its attachments 36. Instead of immediately repairing these inevitable damages, the respective shredding system is still being used. Of course, this leads to low throughput and longer operating times. The quality of the output also suffers, as well as the wear on the damaged areas increases, and it may be caused by the unresolved damage to the shaft system to further damage. All that because it is not easy to spend the time required for removal and replacement of the shaft system of repairing the damage.

In many cases such damages are attempted to be remedied without removal of the shaft system. This is only possible by working the service personnel in the cutting room of the twin-shaft shredder itself, with the workstation located directly on the shafts 1 and 3, and the work actually has to be done under the feet of the service personnel.

In addition, due to all these concerns, the availability of such two-shaft shredders with synchronous drive described here, of course, considerably reduces their economic disadvantage.

Another disadvantage of this two-shaft shredder with synchronous drive of the waves according to the current state of the art is still that the removal of the impurities, ie of input material, which can not be crushed, is possible only under very difficult conditions. For this it is often essential that the operator go into the crushing area of the crusher and must step on the crushing shaft to remove the contaminant. Such measures again reduce availability.

It should not be forgotten that the work on changing, maintaining and repairing the state-of-the-art shaft system in two-shaft shredders requires partially unreasonable work by the service personnel and is sometimes associated with a greater risk of injury.

The document DE 43 15 671 A1 discloses a crusher having the features according to the preamble of claim 1.

Description of the invention

The invention is therefore based on the object at least partially overcome the disadvantages of the prior art.

This object is achieved by a comminution device according to claim 1. Advantageous developments are defined in the dependent claims.

The comminution device according to the invention comprises: two comminution shafts arranged parallel to one another and having comminution elements arranged thereon, wherein the comminution shafts are preferably rotatable in a mechanically synchronized manner with respect to each other; a shaft-side coupling member connected to a respective first end of the crushing shafts; and a housing having a housing-side coupling element which can be coupled to the shaft-side coupling element. The crushing device according to the invention is characterized by a displacement device, which causes a displacement of the crushing shafts for decoupling and coupling the shaft-side coupling element from or on the housing-side coupling element. With the displacement device (as part of the comminuting device), the two comminution shafts designed for synchronous operation can be displaced as a unit in order, for example, to change the shafts. Therefore, according to the invention, an external device for moving, which is necessary according to the prior art, is unnecessary. The synchronization of the shafts takes place on the drive side.

According to a development of the comminution device according to the invention, the housing-side coupling element and the shaft-side coupling element can have mutually complementary centering elements. This facilitates merging and aligning the two coupling elements.

Another development is that a coupling-side housing wall can be made double-walled and undivided. In this way, there is a gap in which can fall from the shaft side penetrating parts of the input material, without further to get to the coupling elements. Since the shredding waves can be moved by means of the displacement device with a sufficiently large stroke, it is therefore not necessary to divide the wave-side wall of the double-walled housing wall, thus allowing a removal of a partial surface, whereby a way to lift out the waves would be possible.

The shredding device according to the invention further comprises: an end wall in which two bearing housings are provided for supporting a respective second end of the shredding shafts; the second ends are in the axial direction of the shredding waves opposite to the first ends; and wherein the end wall is releasably secured to the housing and as a two-shaft assembly of end wall and crushing shafts can be installed and removed. This has the advantage that the arrangement of the end wall (with the bearing housings) and the crushing waves (with the shaft-side coupling element) is stable with respect to the relative position to each other and can be moved and replaced as a unit.

In another development, the shredding device may further comprise a funnel wall of a hopper, wherein the funnel wall is coupled to the end wall and provided pivotable about an axis to cause disengagement or coupling of the shaft-side coupling element from or on the housing-side coupling element when pivoting the funnel wall ; wherein the pivoting of the funnel wall in particular causes a displacement of the two-shaft assembly in the axial direction of the shredding shafts and a pulling or pushing the shaft-side coupling element from the housing-side coupling element, wherein the end wall is supported after the removal or before pushing on the housing. The funnel wall is included in this development in the displacement device. By supporting the end wall on the housing, an external support is not required.

Another development is that the crushing device may further comprise at least one maintenance cover of the housing, which is arranged along the shafts and about a preferably parallel to the crushing shafts rotation axis is hinged, preferably two such maintenance flaps are disposed on opposite sides of the housing.

This can be further developed to the effect that on an inner side of the at least one maintenance flap a counter rake can be attached or formed as a unit with counter rake, the teeth of which engage between the size reduction elements on the size reduction shafts. In this way, the counter rake is unfolded together with the maintenance cover.

The maintenance flap can be held on the housing by means of a lock. This allows a quick change of the maintenance door by the lock is unlocked, for example, which also serves as a rotation axis bolt is moved.

In another development, a Nachschneiderechen or breaking bar may be provided in the housing, which is designed for additional crushing already shredded by the crushing input material, wherein the Nachschneiderechen or breaker bar is below the crushing waves and by means of a pivoting device from the housing in the direction of the open Maintenance flap is pivotable. By means of the pivoting device, the Nachschneiderechen can be easily moved out and / or out.

In this case, parts that hinder pivoting of the Nachschneiderechens be moved before or together with the Nachschneiderechen so that a swinging is possible. In particular, for example, lateral hopper plates can be folded away to release the space below the waves.

The reaming rake may be secured to the front wall of the twin-shaft assembly and to an opposite end wall of the housing by means of a respective fastening device, the fastening device preferably comprising displaceable elements. Thus, the Nachschneiderechen can be easily removed or replaced.

The invention also provides a shredding system comprising a shredding device according to the invention with the two-shaft assembly or one of its developments, as well as a changing device for gripping, holding and transporting the two-shaft assembly. With the changing device (for example in the form of a gripping arm), the two-shaft assembly can be removed from the housing after removal from the housing-side coupling element, effected by the displacement device. The installation of the two-shaft assembly is carried out in the reverse order.

This can be further developed in that the gripping device can have retaining clips which can be positioned around the comminuting shafts. With the brackets, the waves can be taken, preferably in a space between the crushing elements.

Another development of the crushing system is that a height-adjustable support device may be provided at a coupling end of the housing on which the changing device can be supported to allow for a change of the two-shaft assembly a height-defined position of the two-shaft assembly. This allows accurate positioning of the shafts during installation, in particular when coupling the shaft-side and housing-side coupling elements.

Further features and exemplary embodiments and advantages of the present invention will be explained in more detail with reference to the drawing. It is understood that these embodiments can not exhaust the entire scope of the present invention. It is further understood that some or all of the features described below may be combined with each other in other ways.

Brief description of the drawings

Fig. 1-3

show the state of the art.

Fig. 4-10

show an embodiment of the twin-shaft shredder according to the invention.

embodiments

The invention has for its object to largely eliminate the above-mentioned disadvantages of the prior art, so as to make better use of the advantages of this two-shaft shredding system described here. This is done by a achieved considerable shortening of the time required for the change of the shaft system. The time required for maintenance and repair work is significantly reduced. As well as the implementation of such work for the service personnel considerably easier and labor-technically safer.

As a result, the operator of such synchronously driven twin-shaft shredder is able to install in the crusher the most suitable shaft system, consisting of crushing shafts, counter and recut rakes, for the respective task of comminution, since the time required and thus the costs for the dismantling and reassembly are significantly less than the economic benefit of operating with the most appropriate shaft system, cost, and throughput.

Also, it is the operator of such two-shaft shredder easier to comply with the economically advantageous maintenance intervals for the processing of waves, counter and Nachschneiderechen. This not only reduces the cost, but also increases throughput.

Also on the damage of parts of the shaft system, such. On broken knives or licks, the operator of such synchronously driven twin-shaft shredder can respond immediately, and repair immediately without additional time required.

By this invention, the availability of the twin-shaft shredding system is considerably increased, which again contributes significantly to increasing the economy.

To increase the availability also contributes that with the solution according to the invention, the removal of the contaminants, ie non-shredded input material is very easy and fast, without having to go to the operating staff in the twin-shaft shredder.

The object according to the invention is achieved by a mobile or stationary two-shaft comminution device with synchronous drive of the two comminution shafts, wherein the comminution device according to the invention comprises: two comminution shafts arranged in parallel with comminution elements arranged thereon; a shaft-side coupling member connected to a respective first end of the crushing shafts; and a housing having a housing-side coupling element which is connected to the shaft side Coupling element can be coupled. The crushing device according to the invention is characterized by a displacement device, which causes a displacement of the crushing shafts for decoupling and coupling the shaft-side coupling element from or on the housing-side coupling element.

In twin-shaft shredders with synchronous drive of the shredding shafts, the two side walls 43 and 44 are in accordance with the prior art Fig. 3A which also includes the two counter rakes 31 and 32 ( Fig. 3A ), fixed to the housing (crushing housing) 40 ( Fig. 3A ), and can not be opened.

For the implementation of the task according to the invention, the twin-shaft shredder according to Fig. 4 provided with two maintenance flaps or Ausschwenkwänden 100, which are swung down or folded down. On the service door 100 and the counter rake 101 are attached, similar to the counter rake 31 and 32 in Fig. 3A are executed. By replacing the side walls 43 and 44 of Fig. 3A through the service flaps 100, the shafts 102 are easily accessible after opening and swinging the service door 100 to perform maintenance. Also, the counter rake 101 is accessible by a very good working position so to carry out maintenance work, which was previously not possible in the prior art, because this had the counter rake 31 and 32 in Fig. 3A so far completely expanded.

The maintenance flap 100 is attached to the bottom of the crushing housing 103 in a storage 104. Other embodiments of a movable attachment form are possible.

The attachment of the maintenance flap 100 in the working position takes place on the crushing housing 103, preferably by a hydraulically actuated locking unit 105. Also other embodiments of the locking mechanism with different actuation, e.g. manual or electrical actuation are possible in a further development of the invention.

In a further development of the embodiment according to the invention, it is also conceivable not to swing down or fold down the maintenance flap 100, but to raise it upwards or swing it out laterally.

In a further embodiment of the invention, the maintenance flap 100 is held not by a storage of the maintenance flap 104 on the lower side of the crushing housing 103, but also with a locking unit 105, as in the locking of the maintenance flap on the upper side of the crushing housing 103th used in the working position.

This makes it possible, quickly and easily, with little effort, the maintenance cover 100 remove and reinstall, and thus easily replace the attached on the maintenance flap 100 counter rake 115, in a well exchange.

In a further embodiment of the invention, the maintenance flap 100 can already be carried out so that it contains the elements of the counter rake 101 with prongs 101Z. The maintenance flap 100 is thus with the counter rake 101 a permanently connected unit.

A further advantage of the embodiment according to the invention with the maintenance flaps 100 is that the removal of so-called contaminants, that is, non-comminutable input materials, can thus be carried out easily. In a blockade of the waves 102 by impurities of the crusher is stopped. The side walls of the discharge chute 106 lowered inwardly to cover the discharge belt, the maintenance flaps 100 open with the counter rake 101 and the shafts 102 of the crusher in Reversierbetrieb, ie in the direction of rotation of the shafts 102 not to each other but from each other, operated until the contaminant from the Crushing housing 103 is ejected.

In the prior art, the side walls of the transfer chutes 45 and 46 are in FIG Fig. 3A fixed with crushing housing 40 ( Fig. 3A ) connected. As a result of the embodiment according to the invention, the side walls of the transfer chute 106 are designed to be movable. By the movable design of the transfer chute 106, this can be folded under the shafts 102, or outwardly away from the shafts.

According to the preferred embodiment of folding the side wall of the transfer chute 106 under the shafts 102, a cover of the discharge conveyor therebelow is also provided so as not to damage it when carrying out maintenance work.

Only by folding the side wall of the transfer chute 106, both under the shaft 102, and outwardly away from the shafts 102, an opening to the chopping rake or breaking bar 107 is created.

The operation of the side wall of the transfer chute 106 can be done in both directions of movement, both manually, hydraulically, pneumatically or electrically, as well as in all other types of actuation.

As in the prior art, the twin-shaft shredders with synchronous drive of the crushing waves was performed, the Nachschneiderechen 35 Fig. 3A be removed with the attachments 36, only with considerable effort to wave change from the crushing housing 40.

In the prior art, the reaming rake 35 is in FIG Fig. 3A attached to the two end walls 43 and 44 of the crushing housing 40.

For the attachment of the Nachschneiderechens 107, in the solution according to the invention, although an attachment to the end walls 108 and 109 of the crushing housing 103 was selected.

The attachment is not, however, as in the prior art, by various types of screw, but in one embodiment, such as preferably by a rapidly releasable shape of a sliding and securing bolt 110, as it Fig. 5 shows. Preferably, the sliding and securing bolts 110 are mechanically operated by turning threaded bolts.

This inventive task of easier removal of the Nachschneiderechens 107, in addition to the easily detachable attachment with sliding and securing bolts 110, is also achieved in that the Nachschneiderechen on a movable pivoting device 111 according to Fig. 4 is attached. As Fig. 6 5, it allows the rake 107 to move, underneath the shafts 102, the opening created by folding down the side wall of the transfer chute 106, to the outside of the crushing housing 103, above the opened service door 100.

For the execution of the pivoting device 111, all embodiments are conceivable which make it possible to move out of the shredding housing 107 through the opening created by folding down the transfer chute 106 from the shredding housing 107.

In an embodiment of the invention according to the embodiment, it is also possible to form the side walls of the transfer chute 106 so that they can be moved together with the Nachschneiderechen 107 with a pivoting device 111 under the waves 102 to the outside of the crushing housing 103 out.

Compared to the prior art, the actual removal of the shafts 102 from the crushing housing 103 has been decisively further developed according to the invention. The Fig. 7 shows to the side of the storage of the shafts 102 in the end wall 108 and the movable funnel wall 113th

The movable funnel wall 47 off Fig. 3A must be removed according to the state of the art, to change the shaft. This is no longer necessary with the embodiment according to the invention. The movable funnel wall 113 can remain completely in the twin-shaft shredder. Wherein all types and forms of training the funnel wall 113 are conceivable that do not require the removal of the funnel wall 113 to replace the waves.

Contrary to the prior art with the bearing yoke 51 in Fig. 3B the end wall 108 is formed so that once the two bearing housing 114 are fixed thereto. The attachment of the bearing housing 114 is effected by the screws 115, which, however, need not be removed for removal of the shafts 102. The end wall 108 is not as in the current state of the art, inextricably linked to the crushing housing 103, but can be solved by this by removing the screws 116.

The shaft change of the two shafts 102 thus takes place together with the end wall 108 with the two bearing housings 114 and the shafts 102 mounted therein without the bearing housing 114 having to be separated from the end wall 108. Other embodiments are possible in a development of the method, which no longer requires a removal of the bearings, preferably a bearing housing or the like 114, of the shafts 102 or the end wall 108 in an expansion of the waves from the twin-shaft shredder.

When all screws 116 of attachment of the end wall 108 to the bearing housing 114 on the crushing housing 103 are removed, the shaft pair 112 can be removed together with the end wall 108 of the twin-shaft shredder.

As the Fig. 8 As a plan view of the still installed shafts 102 shows, must first be attached to the shaft pair 102, a lifting and transporting device 117. This device engages with brackets 118 in the shafts 102, thus securing the shafts for safe removal from the twin-shaft shredder, and for subsequent transport.

The shafts 102 are still held by the bearings in the bearing housing 114 in the end wall 108 after attachment of the device 117 on one side. On the other side of the shaft coupling halves 119W on the shafts and 119G on the gearbox.

To be able to remove the shafts 102 with the device 117 from the twin-shaft shredder, the coupling connection 119 must first be released, which consists of the one coupling half 119W on the shaft 102, and the other coupling half 119G on the drive side.

For this purpose, the funnel wall 113, which has a nearly upright position in the working position, with the cylinders 120 and the pivoting device 127 is pressed down. As the Fig. 9 a shaft-shifted plan view 102, thereby the shaft pair 102, with the end wall 108 and the bearing housings 114, displaced in the direction, while the shaft is withdrawn from the coupling 119, in which the funnel wall 113 and the pivoting device 127 forward and is pivoted down.

In the development of the device according to the invention further embodiments are conceivable, which ensure that the shaft pair 102li and 102re, each equipped with the coupling halves 119W, are deducted from the coupling halves 119G, and so the coupling 119 is released or separated.

After this process, the shaft pair 102 is supported on one side with the end wall 108 on the crushing housing 103. On the other hand, the shaft pair 102 is held by the lifting and transporting device 117, which is supported on the tilting hopper 122 with an adjustable support foot 121.

The pair of shafts 102 is then free for removal with a suitable hoist from the twin-shaft shredder. Up to this point, except for the insertion of the device 117 in the shaft pair 102, no hoist was still required.

The method may be further developed in further embodiments, which once allows the pair of shafts 102 to be withdrawn from the coupling 119 within the two-shaft shredder, and the requisite force is applied to actuate devices of whatever type that is on or within the two-shaft shredder.

A further development of the method is also made possible by ensuring that whatever the type of suitable measures, that the pair of shafts 102 during displacement and removal of the couplings 119 requires no support or support, which takes place from outside the twin-shaft shredder.

For a better understanding of the wave change already described in the prior art, even after the inventive execution of the quick change method described as follows, wherein the same conditions were chosen. So simple shaft replacement 102, without replacing the counter rake 101 and Nachschneiderechen 107th

For this purpose, first the maintenance flap or Ausschwenkwand 100 must be solved by the locking device 105 from the crushing housing 103. Then, the service door 100 can be pivoted together with the counter rake 101 down and out or folded.

Then, in a preferred embodiment, the sliding and securing pins 110 of the reaming rake 107 are pulled out of the reaming rake 107 with the screws 110S, thus releasing the reaming rake for removal. Subsequently, the side wall of the discharge chute 106 is folded down, whereby a continuous opening under the waves 102 is formed. Through this opening then the Nachschneiderechen 107 can be pivoted with the pivoting device 111 to the outside.

Then the screws 116 of the end wall 108 are released. This end wall includes the bearing housing 114 which are secured to the end wall 108 with the screws 115, which, however, need not be removed.

As a next step, the lifting and transporting device 117 is placed on the two shafts 102 and secured thereto. In this case, the device 117 is supported with a plurality of brackets 118 on the shafts 102, and with the support leg 121 on the tilting funnel 122 from.

Now, the pair of shafts 102 can be displaced by lowering the funnel wall 113, which is done by the operation of the cylinder 120, and the shafts 102 are withdrawn from the clutches 119 and released. The shaft pair 102 can then be removed with the device 117 with a suitable lifting gear from the crushing housing 103.

The installation of the waves is then in the reverse order of the steps listed here. As time expenditure for the wave change only 0.5 to 1 man hour to spend in the average size of a two-shaft shredder, compared to the current state of the art of 12-16 man hours. In the larger series, the time required is about 1-2 man-hours, compared to the current state of the art with 26-48 man hours.

These times in the embodiment according to the invention relate only to the replacement of the shafts 102, but maintaining the counter-rake 101 and the Nachschneiderechens 107th

Even if not only the replacement of the shafts 102 occurs, but also the replacement of the counterpart 101 and Nachschneiderechens 117 when changing the shaft, these times are extended in the application of the invention Embodiment only very insignificant, when storing the maintenance flap 101 with a locking unit 105, instead of in a storage unit 104, and the maintenance flap 100 with the counter rake 101 in one unit.

The other disadvantages of the prior art when installing the shafts 1 and 3 in conjunction with the clutch 4, or the coupling halves 5 on the shaft, and the coupling half 7 on the transmission, could also be eliminated with the method according to the invention.

The Figure 10 shows a view in the region of the coupling 119, with the coupling halves 119W on the shaft 102, wherein a shaft 102 has been arranged offset for better view, and the coupling half 119G on the drive side. From this you can see the close fit between the two coupling halves. In order to facilitate the sliding of the shaft 102 with the coupling half 119W on the coupling half 119G, the coupling half 119G has been provided with an additional centering mandrel 123. In the shaft 102 with the coupling half 119G, a bore has been provided which can receive the centering mandrel.

When installing the shafts 102 with the coupling half 119W and the sliding onto the coupling half 119G, first a centering of the shaft with the centering mandrel 123 is performed. Then you can easily check the position of the waves to each other and corrected if necessary. Subsequently, the shaft with the coupling half 119W can be completely pushed onto the coupling half 119G and so, and so a positive connection can be created.

In a further development of these methods, all other possibilities of shaft centering are conceivable, such as, for example, with a mandrel in the shaft, or a mandrel which extends on the drive side through a gearbox into the shaft and can be displaced.

The method for quick change of crushing shafts on twin-shaft shredders has brought a further advantage over the prior art. By moving the shafts 102 with the cylinder 120 of the funnel wall 113, a larger displacement could be achieved. This made it possible to achieve a greater distance between the sealing of the shaft with the sealing ring 124 with the bulkhead and the end wall 109 on the drive side. As a result, the penetration of foreign bodies in the seal of the drive side is almost avoided, but such should happen the seal between the sealing ring 124 and the bulkhead.

The utilization of this greater distance than the bulkhead space is possible in two-shaft shredder according to the prior art only if a split bulkhead is provided.

The illustrated embodiments are merely exemplary and the full scope of the present invention is defined by the claims.

Claims (12)

1. Shredding device, comprising:

   two shredding shafts (102) arranged parallel to each other with shredding elements arranged thereon, wherein the shredding shafts are preferably rotatable mechanically synchronized to each other;

   a shaft-side coupling element (119W) which is connected to a respective first end of the shredding shafts;

   a housing (103) with a housing-side coupling element (119G) which can be coupled to the shaft-side coupling element (119W); and

   a displacement device (113, 127) enabling displacement of the shredding shafts (102) for decoupling and coupling the shaft-side coupling element (119W) from or to the housing-side coupling element (119G);

   an end wall (108) in which two bearing housings (114) are provided for supporting a respective second end of the shredding shafts (102);

   wherein the second ends are opposite to the first ends in the axial direction of the shredding shafts (102); and

   wherein the end wall (108) is detachably fastened to the housing (103) and can be installed and removed as a dual-shaft assembly of end wall (108) and shredding shafts (102);

   wherein the displacement device (113, 127) is coupled to the end wall (108) in order to effect decoupling and coupling of the shaft-side coupling element (119W) from or to the housing-side coupling element (119G),

   characterized in that

   the displacement device (113, 127) effects displacement of the dual-shaft assembly in the axial direction of the shredding shafts (102) and withdrawal of the shaft-side coupling element (119W) from the housing-side coupling element (119G);

   wherein the end wall (119) is supported on the housing (103) after withdrawal.
2. Shredding device according to claim 1, wherein the housing-side coupling element and the shaft-side coupling element have complementary centering elements.
3. Shredding device according to claim 1 or 2, wherein a coupling-side housing wall is double-walled and undivided.
4. Shredding device according to one of claims 1 to 3, wherein the displacement device comprises a hopper wall (113) of a feed hopper, and wherein the hopper wall is coupled to the end wall and is provided pivotably about an axis in order to effect decoupling and coupling of the shaft-side coupling element from or to the housing-side coupling element when the hopper wall is pivoted, in particular wherein the pivoting of the hopper wall causes a displacement of the dual-shaft assembly in the axial direction of the shredding shafts and a withdrawal of the shaft-side coupling element from the housing-side coupling element, wherein the end wall is supported on the housing after withdrawal.
5. Shredding device according to one of claims 1 to 4, further comprising:
   at least one maintenance flap (100) of the housing that is arranged along the shafts and is foldable about an axis of rotation extending preferably parallel to the shredding shafts, wherein preferably two such maintenance flaps are arranged on opposite sides of the housing.
6. Shredding device according to claim 5, wherein a counter rake (101) is fastened to an inside of the at least one maintenance flap or the maintenance flap is formed with counter rake as a unit, the tines of which engage between the shredding elements on the shredding shafts.
7. Shredding device according to claim 5 or 6, wherein the maintenance flap is held on the housing by means of a lock.
8. Shredding device according to one of claims 1 to 7, wherein a re-cutting rake (107) or crushing beam is further provided in the housing, which is designed for the additional shredding of input material already shredded by the shredding shafts, wherein the re-cutting rake or crushing beam is located below the shredding shafts and is pivotable out of the housing in the direction of the opened maintenance flap by means of a pivot device.
9. Shredding device according to claim 8, wherein parts which impede a pivoting out of the re-cutting rake are moved beforehand or together with the re-cutting rake in such a way that a pivoting out is possible.
10. Shredding device according to claim 8 or 9, wherein the re-cutting rake is fastened to the end wall of the dual-shaft assembly and to an opposite end wall of the housing by means of a respective fastening device, wherein the fastening device preferably comprises displaceable elements.
11. Shredding system comprising:

    a shredding device according to one of claims 1 to 10; and

    a changing device for gripping, holding and transporting the dual-shaft assembly.
12. Shredding system according to claim 11, wherein the gripping device comprises retaining brackets which can be positioned around the shredding shafts.

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