AU3434302A

AU3434302A - Impact cone crusher

Info

Publication number: AU3434302A
Application number: AU34343/02A
Authority: AU
Inventors: Roger Trevor Kay
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-05-04
Filing date: 2002-04-17
Publication date: 2002-11-07
Anticipated expiration: 2022-04-17
Also published as: AU784324B2

Description

Our Ref:7698330 P/00/011 Regulation 3:2

AUSTRALIA

Patents Act 1990

ORIGINAL

COMPLETE SPECIFICATION STANDARD PATENT Applicant(s): Address for Service: Invention Title: Roger Trevor Kay 971 Cobbitty Road Formerly Oran Park Road ORAN PARK New South Wales 2567 Australia DAVIES COLLISON CAVE Patent Trade Mark Attorneys Level 10, 10 Barrack Street SYDNEY NSW 2000 Impact cone crusher The following statement is a full description of this invention, including the best method of performing it known to me:- P:\WPDOCS\DYS\ pcic\7598150 comp.do-16/04/02 -1- IMPACT CONE CRUSHER This invention relates generally to crushers for crushing materials such as for example rock, ore and other friable materials and more particularly, to impact crushers.

Impact crushers are used when it is required to produce finely graded materials, and/or when a cube product is necessary. Impact crushers yield more cube shaped product than can be obtained from that which is produced by cone or gyratory crushers. Currently known impact crushers comprise an arrangement by which feed material is directed by gravity towards rotating "blow bars" travelling at high rotational speed. The high speed and energy required to initially hit the feed with great force and then direct it to secondary fracture, by collision with fixed breaker bars ensures that a relatively high percentage of dust is produced. This dust generally has a particle size of less than 5mm. Many crushing operations which produce aggregates such as for example, for use in a pre mixed concrete, require good cubic shaped aggregate, for the reason of providing concrete strength and quality, and the need for minimal dust, if any.

Because of the way in which known impact type crushers apply energy to the feed material, very high power is used, and often too finely graded product occurs. Further with known impact type crushers, high wear to the crushing elements results, when feed material having abrasive qualities, and or a high work index value is processed.

Another form of crusher currently in use is what is commonly referred to as a cone crusher. An example of a crusher of this type is described in Australian Patent Specification No. 492091. Known gyratory or reciprocating cone crushers largely use squeeze or compressive force, to perform the crushing operation and not designed for use as impact type crushers.

P:\WPDOCS\DYS\Spc\7598150 -omp.doc-614fO2 -2- It is an object of the present invention to provide an improved impact crusher which alleviates one or more of the aforementioned problems.

According to the present invention there is provided an impact crusher apparatus which includes a fixed crusher member which includes a an internal chamber having opposed open ends with a longitudinal axis extending between the open ends, the chamber having an internal wall surface which is generally frusto-conical in shape and which tapers towards one of the open ends. The apparatus further includes a movable crusher member having an external wall surface which is generally frusto-conical in shape, the movable crusher member being at least partially disposed within the internal chamber and adapted for reciprocating movement in the general direction of the longitudinal axis. The crusher apparatus further includes drive means and a connecting member operatively connecting the drive means to the movable crusher member, the connecting member providing for a positive connection between the drive means and the movable crusher member such that the drive means provides a positive drive to the movable crusher member in both directions of reciprocating movement, the drive means being adapted to cause reciprocating movement of the movable crusher member to cause material to be crushed by impact with the movable crusher member.

Preferably, one open end of the fixed crusher member forms a feed inlet opening through which material to be crushed enters the internal chamber. A space is formed in the internal chamber between the inner wall surface of the fixed crusher member and the external wall surface of the movable crusher member. The arrangement is such that material to be crushed passed along the space from the feed inlet open end and out through the other open end which form an outlet opening. Preferably, the crusher apparatus is arranged with the longitudinal axis being generally upright with the feed inlet opening being disposed above the outlet opening. Preferably, the space between the inner wall surface of the fixed crusher member and the movable member converges from the inlet opening towards the outlet opening.

The drive means may be in the form of a drive shaft operatively connected to a P:\WPDOCS\DYS'spnic\7598150 womp.dom-16/4/02 -3suitable drive source such as a motor. Preferably, the drive shaft extends generally at right angles to the longitudinal axis of the fixed crusher member and is disposed below the outlet end thereof.

The connecting member may be in the form of a connecting bar having one end operatively connected to the movable crusher member and the other end operatively connected to the drive shaft. The connection of the connecting member to the drive shaft may be by way of a bearing portion operatively connected to an eccentric on the drive shaft so that rotation of the drive shaft will cause reciprocation of the connecting member.

Preferably, the connecting member is disposed generally upright in the same direction as the longitudinal axis of the fixed crusher member. Preferably, the arrangement is such that the movable crusher member can reciprocate at speeds of 350 strokes per minute or higher and preferably from 350 to 500 strokes per minute.

Preferably, the length of stroke of the movable crusher member is from 40mm to The apparatus may further include a fly wheel operatively connected to the drive shaft.

Preferably, the movable crusher member has a relatively high cone angle from 500 to The crusher apparatus of the present invention in its preferred form has a number of advantages over known crushers. For example, as the impact strength of the materials to be crushed is considerably lower than the compressive strength, it follows that relatively less power will be needed, and that the mass of the crusher members can be considerably less. The combination of higher speed of operation, a longer crushing stroke and steep mantle angle, provide the conditions in which impact crushing can take place. At the higher speed of operation required for impact crushing to take place, it is necessary to have positive connection between the drive shaft and the movable crusher member to enable it to rise and lower in equal time. Sufficient mechanical advantage to perform the impact PAWPDOCS\DYS\Wc\7598150 comp.dom-16/04/02 -4crushing can be provided by the eccentric shaft combined with the flywheel action. A more evenly graded product is produced than with known impact crushers. The crushing action overcomes feed material through its resistance to impact rather than squeeze or compression, power usage reduced. Interparticle crushing occurs around 360 degrees of the crushing chamber when using the crusher of the present invention. This combined with impact crushing provides a high quality product. Durable and fracture resistant materials can be used in the construction of the main crushing elements. It follows that because minimal rubbing and relative motion between the feed material and the crushing elements takes place, longer useful life of the crushing elements occurs. Such life will be improved over that life gained when using known cone or gyratory crushers.

Preferred embodiments of the invention will be hereinbefore described with reference to the accompanying drawings, and in those drawings: Figures 1 is a schematic side elevation of crusher apparatus according to a preferred embodiment of the present invention; Figure 2 is a schematic front elevation of the apparatus shown in Figure 1; and Figure 3 is a schematic view of part of the apparatus shown in Figures 1 and 2 with the eccentric in its uppermost position.

Referring to the drawings there is shown a crusher apparatus generally indicated at which includes a main support frame 12 in the form of a tubular shaped body 13 and a crusher assembly 14 which is carried by the main support frame 12.

The crusher assembly 14 includes a fixed crusher member 16 having an internal chamber 17 of general frusto-conical shape with a feed inlet opening 18 at one end and an annular outlet opening 19 at the other end. The inner wall surface of the internal chamber 17 has a liner 20 thereon. The crusher assembly 14 further includes a movable crusher member 24 which includes a generally frusto-conical body portion 25 and a guide rod 26 PAWPDOCS\DYS\spk\75985IO .np.do.-16/04/02 extending from one end of the body 25. The outer surface of the frusto-conical body has a liner 27 thereon.

The movable crusher member 24 is supported by a slide member 32 which is adapted to receive the guide rod 26 therein. The guide rod 26 can move relative to the slide member 32 under the influence of for example, hydraulic force thereby enabling adjustment of the size of product to be produced. The slide member 32 is mounted for sliding movement within bearing assembly 33 which is secured to the main support frame 12. Preferably, the movable crusher member has a cone angle X (see Figure 2) from 500 to 75 This high cone angle is particularly desirable because the impact crusher of the present invention is limited to axial reciprocation.

A hopper 36 is mounted at the feed inlet opening 18 of the fixed crusher member 16. The finished product can be discharged from the apparatus via discharge outlets 11.

As can be readily seen in Figures 1 and 2 the cone angle of the fixed and movable crusher members is different so that the walls converge from the feed inlet opening towards the outlet opening.

A drive shaft 40 is operatively connected to a motor (not shown), the drive shaft being supported in bearings 42 and 43 (See Figure Fly wheels 41 and 45 are mounted to the drive shaft The apparatus further includes a connecting member 46 which operatively connects the drive shaft to the movable crusher member 24 so as to cause reciprocating movement thereof. To this end, the drive shaft 40 includes an eccentric 44 to which a bearing section 49 of the connector member 46 is connected. The other end of the connecting member is operatively connected to the slide member 32 via a hinge portion 47 through a hinge pin 48.

Rotation of the drive shaft causes rotation of the eccentric in a revolving fashion P:\WPDOCS\DYSspecic\7598150 comp.doc-16/04/02 -6about the central axis of the drive shaft. The eccentric can rotate within bearing section of the connector member thereby causing a reciprocation motion of the movable crusher member towards and away from the stationary member.

Finally, it is to be understood that various alterations, modifications and/or additions may be incorporated into the various constructions and arrangements of parts without departing from the spirit or ambit of the invention.

Claims

1. An impact crusher apparatus which includes a fixed crusher member which includes a an internal chamber having opposed open ends with a longitudinal axis extending between the open ends, the chamber having an internal wall surface which is generally frusto-conical in shape and which tapers towards one of the open ends, the apparatus further including a movable crusher member having an external wall surface which is generally frusto-conical in shape, the movable crusher member being at least partially disposed within the internal chamber and adapted for reciprocating movement in the general direction of the longitudinal axis, the crusher apparatus further including drive means and a connecting member operatively connecting the drive means to the movable crusher member, the connecting member providing for a positive connection between the drive means and the movable crusher member such that the drive means provides a positive drive to the movable crusher member in both directions of reciprocating movement, the drive means being adapted to cause reciprocating movement of the movable crusher member to cause material to be crushed by impact with the movable crusher member.

2. An impact crusher apparatus according to claim 1 wherein one open end of the fixed crusher member forms a feed inlet opening through which material to be crushed enters the internal chamber, there being a space in the internal chamber between the inner wall surface of the fixed crusher member and the external wall surface of the movable crusher member, the other open end forming an outlet opening.

3. An impact crusher apparatus according to claim 1 or claim 2 wherein the longitudinal axis is disposed generally upright with the feed inlet opening being disposed above the outlet opening.

4. An impact crusher apparatus according to any preceding claim wherein the space between the inner wall surface of the fixed crusher member and the movable member converges from the inlet opening towards the outlet opening.

P:\WPDOCS\DYS'pcic\7598150 omp.dom- 1604/02 -8- An impact crusher apparatus according to any preceding claim wherein the drive means includes a drive shaft operatively connected to a drive source.

6. An impact crusher apparatus according to claim 5 wherein the drive shaft extends generally at right angles to the longitudinal axis of the fixed crusher member and is disposed below the outlet end thereof.

7. An impact crusher apparatus according to claim 5 or claim 6 wherein the connecting member includes a connecting bar having one end operatively connected to the movable crusher member and the other end operatively connected to the drive shaft.

8. An impact crusher apparatus according to claim 7 wherein the connection of the connecting member to the drive shaft may be by way of a bearing portion operatively connected to an eccentric on the drive shaft so that rotation of the drive shaft will cause reciprocation of the connecting member.

9. An impact crusher apparatus according to claim 8 wherein the connecting member is disposed generally upright in the same direction as the longitudinal axis of the fixed crusher member.

An impact crusher apparatus according to any one of claims 5 to 9 further including a fly wheel operatively connected to the drive shaft.

11. An impact crusher apparatus according to any preceding claim wherein the movable crusher member has a relatively high cone angle from 500 to 750 P:\WPDOCS\DYS\specic\7598150comp.doc-16/04/02 -9-

12. An impact crusher apparatus substantially as hereinbefore described with reference to the accompanying drawings. Dated this 1 7 th day of April, 2002 ROGER TREVOR KAY By Its Patent Attorneys DAVIES COLLISON CAVE