AU5015399A

AU5015399A - Impact crusher or blast impact crusher

Info

Publication number: AU5015399A
Application number: AU50153/99A
Authority: AU
Inventors: Werner Bischoff; Klaus Czechaczek
Original assignee: Babcock Kraftwerkstechnik GmbH
Current assignee: Babcock Kraftwerkstechnik GmbH
Priority date: 1998-10-16
Filing date: 1999-09-27
Publication date: 2000-04-20
Anticipated expiration: 2019-09-27
Also published as: TR199902581A2; YU51399A; AU747834B2; HRP990322A2; EP0997195A1; DE19847772B4; DE19847772A1; TR199902581A3; YU51499A

Description

C.

C C

C

C.

C

en C

C

CC

C C 4CC C 4 CC

C.

CC C

C.

CCC*

C

CC

AUSTRALIA

PATENTS ACT 1990 CONMETE SPECIFCATION NAME OF APPLICANT(S): Babcock Kraltwerkstechnik GmbH ADDRESS FOR SERVICE: DAVIES COLLISON CAVE Patent Attorneys 1 Little Collins Street, Melbourne, 3000.

INVENTION TITLE: Impact crusher or blast impact crusher The following statement is a full description of this invention, including the best method of performing it known to me/us:- The invention relates to an impact crusher or blast impact crusher in accordance with the preamble of claim 1.

The blast impact crusher is used for the crushing of brown coal, wherein a rotor provided with beaters in conjunction with an impeller arranged on the same shaft performs the crushing operation.

From the publication "Aufbereitungs-Technik 13 (1972), pages 217-225, 305-312", an impact crusher is known which has beaters, where the beater arms in conjunction with a symmetrical, once only reversible beater head are provided with anti-wear means.

These anti-wear means consist of a plate 26, which covers a partial length of the front side of the beater arm in the rotational direction of the crusher. In heavy duty applications this type of wear protection is inadequate.

From DE-OS 26 58 469 a blast impact crusher is known where the crusher shaft is at a distance surrounded by a shaft-protecting tube to protect the top of the shaft against high temperatures. The shaft-protecting tube can consist of a continuous mantle or be comprised of individual tube segments. It is provided with openings for the passage of the beaters fastened to the crusher shaft. When the beaters are demounted, the protecting tube must first be removed before the beaters can be demounted following unscrewing of boss joint bolts 23.

It is the object of the present invention to design the generic impact crusher in such a manner that the beater arms are comprehensively protected against wear.

This object is achieved with a generic impact crusher in accordance with the present 000•0 10 invention by the characterising features of claim 1. Advantageous embodiments of the invention are claimed in the subclaims.

The impact crusher according to the present invention has anti-wear means along the entire length of the beater arm on the sides which are particularly exposed to wear.

These are on the one hand the side where the material to be crushed advances within the crusher as well as on the other hand preferably the front side of the beater arm in the rotational direction of the crusher.

An embodiment example of the invention is shown in the drawing and is explained in greater detail below. Shown are in Fig. 1 a blast impact crusher in longitudinal section.

Fig. 2 the detail Z as shown in Fig. 1 and Fig. 3 a partial section of the side view of Fig. 2 and Fig. 4 the section IV IV as per Fig. 3.

The blast impact crusher shown comprises a rotor rotating in a housing 1. The rotor consists of a shaft 2 which, via a motor 3, is driven by a transmission and is mounted in two bearings 4, 5 positioned outside the housing 1. Shaft 2 has a beater part 6 equipped with several rows of beaters as well as an impeller 8 with radial vanes 9.

The impeller 8 acting as ventilator through a suction duct (not shown) sucks hot flue gas from the combustion chamber of a boiler (not shown). The material to be crushed, in the present case raw lignite, is fed into the suction duct and together with the hot flue gas is conducted through a downstream inlet 10 into the crusher. The material to be crushed and the flue gas flow in the direction of arrow 11 through the beater part 6 of the crusher, where a precrushing process takes place. The final crushing process is performed in the impeller 8. The crushed material is transported in the direction of arrow 12 through a transition piece 13 and a downstream dust duct to the burners (not shown) of the boiler.

In an impact crusher, there is no impeller.

Shaft 2 of the crusher is internally cooled with water. The body of shaft 2 has annular grooves 14 resulting in annular bosses 15 being formed. At a distance from the front end of the annular bosses 15 said shaft 2 is surrounded by a protecting tube 16. A space 17 is thereby formed which has cooling air flowing through it.

Each beater 7 consists of a beater arm 18 onto the free end of which and swinging Sfrom it a beater head 19 is fastened by means ofa bolt 20. Said bolt 20 has a stepped diameter and is passed through correspondingly shaped bores in said beater head 19 and said beater arm 18. On the side of said beater head 19 where the crushed material flows off there is a squared end 21 welded onto said bolt 20 to secure it against falling out.

Beater 7 has a foot 22 which is fitted into an annular groove 14 between two annular bosses 15. Said beaters 7 are held in said shaft 2 by means of boss joint bolts 23 which are passed through aligned bores in said annular bosses 15 and said feet 22 of said beaters 7. Said protecting tube 16 is provided with recesses 24 through each of which a beater arm 18 projects. The width of the part of said beater arm passing through said recess 24 corresponds to the greatest width of said beater arm 18 including said foot 22. This allows, after unscrewing of said boss joint bolts 23, said beaters 7 to be removed from the shaft, without said protecting tube 16 having to be demounted.

The beater arms of said beater 7 are protected against wear by a protective part This protective part 25 consists of a plate 26 which can be of angular shape. Said plate 26 bears against the side of said beater arm 18 where, as per arrow 11, the material to be crushed advances. An angle leg 27 of plate 26 overlaps the front side of said beater arm 18 in the rotational direction of the shaft. Said plate 26 together with said angle leg 27 extends along the entire length of said beater arm 18. At the upper end it is overlapped by a step 28 cast integrally with said beater head 19. At the lower end said protective part 25 projects into recess 24 of the protecting tube 16 penetrated by said beater arm 18 and is thus overlapped by said protecting tube 16.

Said protective part 25 is releasably connected with said beater arm 18. It is provided with two openings each of which accommodates a conical adjustable block 29. Said adjustable block 29 is provided with an internal thread which the external thread of a screw bolt 30 engages. Said screw bolt 30 from the opposite side is passed through a *6O bore in said beater arm 18. Said plate 26 of said protective part 25 thickens in the direction of said angle leg 27 which has a thickness greater than that of said plate 26.

The reference numerals in the following claims do not in any way limit the scope of the respective claims.

Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.

Claims

1. Impact crusher or blast impact crusher consisting of a shaft rotating in a housing, into which shaft annular bosses (15) are formed between which beaters (7) are held, each of which beaters consisting of a beater arm (18) which carries at its free end a beater head (19) and is provided at its side where the material to be crushed advances with a protective part (25) consisting of a plate (26), characterised in that said protective part (25) extends along the entire length of the side of said beater arm (18) where the material to be crushed advances and is at one end overlapped by a step (28) of said beater head (19) and at the other end by a protecting tube (16) surrounding said shaft

2. Impact crusher in accordance with Claim 1, characterised in that said protective part (25) is of angular shape and that the angle leg (27) of said protective part overlaps the side of said beater arm (18) pointing in the rotational direction of said shaft

3. Impact crusher in accordance with Claim 1 or 2, characterised in that said protective part (25) is penetrated by a conical adjustable block (29) which is provided with an internal thread which is engaged by a screw bolt (30) passed through said beater arm (18) from the flow-off side of the crushed material.

4. Impact crusher in accordance with one of Claims 1 to 3, characterised in that said beater arm (18) reaches through a recess (24) of the protecting tube (16) surrounding said shaft and that the greatest width of said beater arm (18) corresponds to the width of the part of said beater arm (18) penetrating said recess (24). .0 6 9 So 0** e9 *6 k 8 An impact crusher substantially as hereinbefore described with reference to the drawings and/or Examples.

6. The steps, features, compositions and compounds disclosed herein or referred to or indicated in the specification and/or claims of this application, individually or collectively, and any and all combinations of any two or more of said steps or features. f DATED this TWENTY SEVENTH day of SEPTEMBER 1999 Babcock Kraftwerkstechnik GmbH 00 by DAVIES COLLISON CAVE ***Patent Attorneys for the applicant(s) patent Attorneys for the applicant(s)