GB2025788A

GB2025788A - Improvements in and Relating to Crushing Machines

Info

Publication number: GB2025788A
Application number: GB7920695A
Authority: GB
Original assignee: Engelbrecht & Lemmerbrock; Engelbrecht and Lemmerbrock GmbH and Co
Current assignee: Engelbrecht & Lemmerbrock; Engelbrecht and Lemmerbrock GmbH and Co
Priority date: 1978-06-14
Filing date: 1979-06-14
Publication date: 1980-01-30
Also published as: CH638407A5; FR2428467B1; DE2825952A1; FR2428467A1; IT7923555A0; GB2025788B; SE7905084L

Abstract

In a crushing machine of the kind comprising a housing accommodating two parallel shafts 6, 7 driven in contrarotation and fitted with alternate cutting blades and spacing elements, the two shafts 6, 7 are mounted by one end in a reducing gear box 5, and pass through holes 8 in an end wall 1 of the housing, the gear box being detachably mounted on the housing and the opposite end wall 4 of the housing being arranged to be pushed onto the free ends of the shafts 6, 7 via bearings 13 and abutted to the housing, to facilitate removal of blades. <IMAGE>

Description

SPECIFICATION Improvements in and Relating to Crushing Machines The present invention relates to crushing machines for crushing or comminuting bulky materials, of the kind comprising a housing accomadating two parallel shafts arranged to be driven in contra rotation and fitted with alternate cutting blades and spacing elements, said shafts being mounted in two opposed end walls of the housing. Hereinafter, such a machine will be referred to as "of the kind described". Generally the housing is rectangular and may form a frame.

Also, the housing is generally provided with a feed hopper for input of the materials to be processed, and an outlet fitted with a sizing sieve which may be securable to the underside of the housing.

In known crushing machines of the kind described mounting the two parallel shafts with the cutting blades and spacing elements and above all the exchange of blades which have become damaged or which have to be resharpened is extremely complicated and time consuming.

It is therefore an object of the invention to facilitate the assembly and disassembly of the machine thus to simplify the exchange of damaged or blunt blades.

Accordingly, the invention consists in a crushing machine of the kind described wherein the two shafts are mounted by one end in a reducing gear box, and pass through holes in an end wall of the housing, said gear box being detachably mounted on said housing and the opposite end wall of said housing being arranged to be pushed onto the free ends of said shafts via bearings and abutted to said housing.

A construction of the important part of the crushing machine is carried out in practice in unit fashion from components consisting of the housing, the gear box combined with the two shafts and the end wall of the housing, facing the gear box so that assembly is definitely facilitated.

For the simple exchange of the cutting blades and spacing elements which can be slid onto the two shafts, only the end wall of the housing on which the free shafts ends are mounted is made detached so that the blades and spacing elements are freely accessible and can be pulled off the shafts and exchanged.

In order that the invention maybe more clearly understood, reference will now be made to the accommpanying drawings which show one embodiment thereof by way of example and in which: Fig. 1 is a vertical cross-section through a crushing machine according to the invention, Fig. 2 is a top plan view of the machine according to Fig. 1, and Fig. 3 is a section along the line 3-3 of Figure 1.

Referring now to the drawings the embodiment of crushing machine shown consists of a rectangular rigid housing on which a feed hopper and a lower outlet having a sieve which defines the size of reduction of the material can be screwed and which can be mounted on a base support. The feed hopper and lower outlet are, however, not shown. The housing is rigidly constructed and has one end wall 1 and two side walls 2 and 3. The fourth wall 4, which faces the end wall 1, is a separate part from the housing per se and can be screwed thereto as will hereinafter be explained.

A gear box 5 accommodating reduction gearing is detachably connected to the rectangular housing 1-3. The ends of two parallel shafts 6 and 7, which are advantageously somewhat offset in height are fixidly mounted in the gear box 5. For connecting the gear housing 5 in which the shafts ends are mounted to the housing 1-3 the, end wall 1 is provided with two apertures 8 for the passage of the shafts 6 and 7, and the end wall 1 is also provided with two recesses 9 in its outer side in which two projections 10 of the gear box 5 fit, so as to ensure a secure central location of the gear box 5 opposite the housing 1-3. Then the gear box 5 is screwed onto the end wall 1.

The two parallel shafts 6, 7 protrude horizontally through the housing which is open on the other end side. It is thus possible to push the cutting blades 11 and spacing elements 12 interchangeably onto the shafts 6, 7 from this side to enable their mounting and peripheral positioning with regard to each other to be altered as required.

For mounting the free ends of the shafts 6 and 7 which are fitted with cutting blades and spacing elements, the detached end wall 4 which faces the gear box 5 is provided with a bearing 13 and a spacer ring or thrust celler 14 in each of two apertures. This end wall 4 with the two bearings 13 and spacing rings 14 is pushed onto the end of the shafts and then a nut 1 5 is screwed onto the threaded ends of the shafts 6, 7, the nut clamping the bearing 13 between it and the spacing ring 14 whereby the spacing ring presses the one shaft 6 against the last cutting blade 11 and the other shaft 7 against a spacing element 12 so that the bladeiand spacing elements are secured in the axial direction. Finally the end wall 4 is screwed to the side walls 2, 3 of the rectangular housing. So as to obtain a satisfactorily fixed mounting of the end wall 4 against the side walls 2, 3, the end wall 4 has a shoulder 1 6 on an inner side of its vertical walls in which the vertical ends of the side walls 2, 3 fit on screwing on the end wall 4.

To exchange blades 11 which are damaged or which have to be sharpened it is only necessary to detach the end wall 4 from the rectangular housing 1-3 and loosen the nut 1 5 so that the end wall 4 can be removed from the shaft ends whereby the cutting blades 11 and the spacing elements 12 can be removed from the shafts and replaced. During this exchange the gear box mounting the shafts remains rigidly connected to the rectangular housing 1--3.

Claims

1. A crushing machine of the kind described, wherein the two shafts are mounted by one end in a reducing gear box, and pass through holes in an end wall of the housing, said gear box being detachably mounted on said housing and the opposite end wall of said housing being arranged to be pushed onto the free ends of said shafts via bearings and abutted to said housing.

2. A crushing machine as claimed in claim 1, wherein the gear box is located on its end wall of said housing by means of protrusions which encircle said shafts engaging centraily in corresponding recesses in said end wall of the housing.

3. A crushing machine as claimed in claim 1 or 2, wherein the bearings for the free shaft ends are kept in place by a nut screwable to the shaft, a spacing ring or thrust collar lying against the last blade cutting or spacing element being interposed therebetween.

4. A crushing machine as claimed in claim 1, 2 or 3, wherein said opposite end wall of the housing has shoulders on the vertical edge of the inner side to abut against the ends of two side walls of the housing.

5. A crushing machine substantially as hereinbefore described with reference to the accompanying drawings.