Screening, crushing or mixing bucket

The invention relates to a screening, crushing or mixing bucket, which is formed into a bucket of an excavating machine or bucket loader, comprising a bottom plate (1), side walls (2) and at the back of the bucket working drums (3) rotatable about their shafts, which screen, crush or mix the material in the bucket as they rotate and at the same time deliver screened, crushed or mixed material out of the bucket, between or through the working drums (3). In the bucket are casings (4) for the power transmission and bearings of the working drums (3). The casings (4) are limited by frame plates (5) to which the bearing housings (6) of the working drums (3) are attachable. The frame plates (5) have receiving and fastening formings (5a, 5b) for the working drums (3), into which the drums (3) with their bearings (6) can be positioned through the rear side of the bucket. The sides of the casings (4) may in that case be smooth and their opening wall plates are on the rear side of the bucket.

BACKGROUND OF THE INVENTION

The invention relates to a screening, crushing or mixing bucket, which is formed into a bucket of an excavating machine or bucket loader, comprising a bottom plate, side walls and at the rear part of the bucket working drums rotatable about their shafts, which screen, crush or mix the material in the bucket as they rotate and at the same time deliver screened, crushed or mixed material out of the bucket between or through the working drums, and casings for the power transmission and bearings of the working drums, the said casings being limited by frame plates to which the bearing housings of the drums are attachable.

A bucket of this type is known from the Applicant's international patent application WO 0158595. In this known bucket, the casings for power transmission and the bearings are located outside the side walls of the bucket in order to prevent the arching problem of material flowing on the working drums. Buckets of similar type are also known, where the power transmission casings are located inside the bucket. Regardless of the location of the power transmission casings, they have to be made openable for servicing. In this case, the problem is that stones will stress the openable sides of the casings and their fixing screws which will no longer be openable after a period of use. Another problem with known buckets is that working drums have to be assembled of several parts during the installation stage in order to be able to install them into place.

BRIEF SUMMARY OF THE INVENTION

The aim of the invention is to provide a bucket of the above type, which does not have the above-mentioned problems.

This aim is achieved in accordance with the invention, in such a way that the frame plates have receiving and fastening formings for the working drums, into which the drums with their bearings can be positioned through the rear side of the bucket.

When the working drum with bearings is brought from behind and the bearing housings are fixed to the frame plates limiting the casing, the outer side walls can be made completely smooth and provided with wear-resistant plates. The working drums may, in addition, be built so as to be installed into place as a single entity.

DETAILED DESCRIPTION OF THE INVENTION

The bucket according to the invention can be fixed to be the bucket of an excavating machine or bucket loader, for which purpose there are fastening lugs8on the top side of the bucket.

The bucket comprises a bottom plate1, side walls2and at the rear part of the bucket working drums3rotatable about their shafts, which screen, crush or mix the material in the bucket as they rotate and at the same time deliver screened, crushed or mixed material out of the bucket between or through the working drums. Between the flanges of the working drums3may be fixed different types of crushing teeth, which are not shown.

To the rear parts of the side walls2are attached casings4for power transmission and the bearings of the working drums3. The casings4have external side walls4aand in the embodiment shown, the casings4are separated from the interior of the bucket by frame plates5, to which the bearing housings6of the working drums3are attachable. In the case shown, the frame plates5are a direct extension of the side walls2and of the same plate material as the side walls2.

What is novel and special about the invention is the fact that the frame plates5comprise receiving and fastening formings5a,5bfor the working drums6, into which the working drums3with their bearings6can be positioned as a single entity through the rear side of the bucket.

The working drums3are horizontal in the operating position of the bucket. The frame plates5are between the external side walls4aof the casings4, at a distance from the external side walls4a, whereupon chain wheel and bearing casings are formed between the frame plates5and the external side walls4aof the casings.

The frame plates5are provided with backwards opening drum receiving openings5a, the assembling slot5bof which allows the drums to be brought into their positions, whereupon the bearings6and the drive gears7of the drums are positioned between the frame plates5and the external side plates4aof the casings. A particularly strong attachment for the drums and their bearing housings is achieved by the bearing housings6being movable in the axial direction of the drums3towards one another into a form locking with the receiving openings5aof the frame plates5. For this purpose, there are low cylindrical projections in the bearing housings6, the diameter of the said projections only just fitting in the round opening5a. The attachment flange of the bearing housings, which surrounds the bearing housings, is fixed with screws or bolts to the frame plate5.

To the rear parts of the frame plates5can be fixed complementary pieces5.1, which limit the receiving openings5aof the working drums in the frame plate and close the assembling slot5bof the working drums to the receiving openings5a. The chain wheel and bearing casings formed between the frame plates5and the external side walls4aof the casings can be closed from behind by fixing detachable back wall plates4bon the rear side of the bucket. Each of the back wall plates4bis preferably fixed from one edge with bolts or screws both to the frame plate5and to the complementary piece5.1, and from the other edge to the rear edge of the external side wall4aof the casing. In this way, the exterior faces of the external side walls4aof the casings4area maintained as smooth wearing plates, which do not need to be opened. The back wall plates4bof the casings4are not subjected to substantial stress from stones when the bucket is in operation and thus it is possible to open them even after a long period of use.