NZ196191A - Jaw rock crusher:jaws free to pivot simultaneously in same direction - Google Patents

Description

1 96191 1 SUBSTITUTION Of AFFLICT ONDEB SECTION 24 I*" ^oe.oom <Korx^g£> ;Patents Form No. 5- ;No.196191 Patents Act 1953 ;Date: 5•2.19^1 ;COMPLETE SPECIFICATION ;"Crushing Apparatus" ;ft©fifjETPof 65 Bentley Street, Christchurch, New Zealand, and^LESL-I-& GEORQ-B—EfcHrS, of 26D Hanrahan Street, Christchurch, New Zealand, both citizens of New Zealand, ;hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- ;- 1 - ;196191 ;This invention relates to crushing apparatus. ;The apparatus of the present invention is useful for crushing rock, and will be described with particular reference to this application. However, the apparatus also is useful for crushing other materials (e.g. glass, minerals, bricks, grains). ;Crushing at present is carried out in a number of types of apparatus:- ball mills, rod mills, hammer mills and jaw crushers. However, for •accurate* crushing i.e. crushing material to obtain particles within a narrow size range, and with relatively few fines, a jaw crusher commonly is used. A jaw crusher crushes by a hammer-and-anvil type of action:- amoving jaw is swung against a stationary jaw. The position of the stationary jaw can be adjusted to alter the minimum gap between the jaws. This type of crusher gives good results, but is rather wasteful of power because a great deal of the force of the moving jaw is absorbed by the stationary jaw rather than by the material being crushed, In consequence, the apparatus requires a heavy support, to endure the uneven load on the apparatus imposed by the impacts on the stationary jaw.

An object of the present invention is the provision of a crusher which is as accurate as a stationery jaw crusher, but which overcomes the above-described disadvantages by providing opposed driven jaws which balance each other. 188191 A further object of this invention is to provide a crusher which is simple and inexpensive to manufacture and repair, and which is adjustable so that the rock may be crushed to a greater or lesser degree.

According to this invention there is provided a crusher which includes: a pair of opposed crushing jaws, a pivotal mounting of each jaw for pivotal movement towards and away from the other jaw, means for driving said jaws to pivot towards each other simultaneously and away from each other simultaneously, whilst allowing them to pivot simultaneously in the same direction, the pivotal mounting of each jaw being adjacent one end of said jaw, said one ends of said jaws being located opposite each other, and the other ends of said jaws being located opposite each other.

Preferably, means vare provided for adjusting the minimum gap between the jaws when they are swung towards each other.

The jaws may be reciprocated by a variety of different drives (of known type) but preferably one of the jaws is driven by a drive shaft carrying eccentrics which bear against said jaw, and the other jaw is connected to said one jaw by one or more connecting rods and further eccentrics.

By way of example, a preferred embodiment of the present invention is described with reference to the accompanying drawings, in which Fig. 1 is an end view of the apparatus of the present invention; and Fig. 2 is a side view of the apparatus of Fig. 1, with N.Z. PATENT 0 2 9 NOV 1985 196191 half of the frame members removed.

Referring to the drawings, a rock crushing apparatus comprises two upper elongated parallel' frame members 3> 4 supported horizontally by end members (not shown). On the top of the frame members 3, 4, two pairs of crusher jaw pivot bearings 5, 6 are provided. Both pairs of pivot bearings 5, 6 oppose each other across the frame members 3, 4- Each jaw 7, 3 has a horizontal shaft 9 extending from each side of its upper end; the ends of each shaft 9 are pivotally secured in the pivot bearings 5, 6. The two jaws 7, # of the crusher are therefore suspended opposite each other from the horizontal frame members, 3, 4« Preferably, the inner surfaces 10 of the crusher jaws are made of heavy gauge plate steel with a plurality of reinforcing ribs (not shown) on their working surface. The inner crushing surfaces of the jaws may be lined with hard alloy steel to reduce wear. The jaws 7> 8, are spaced wider at the top than the bottom,- and two vertical end plates (not shown) are supported by the upper frame members 3, 4 adjacent to the ends of the jaws; the arrangement being such that a "V"shaped hopper is formed by the end plates and jaws. When the crusher is operating, material is to be crushed /fed into the top of the hopper from a chute 11, falls under gravity through the crusher, and leaves the bottom of the crusher in its crushed condition.

The lower ends of the jaws 7, 8 are supported by a 196191 reciprocating mechanism 12 which causes both the crusher jaws to swing simultaneously about their pivot bearings 5, 6. The reciprocating mechanism causes the jaws to come together at the same time and move apart at the same time; each jaw is moved with the same force. The reciprocating movement is provided by eccentrics on the driving shaft 13, which is mounted horizintally in two bearings 14, 15 on the outer surface at the lower end of one of the jaws. The driving shaft 13 extends beyond the width of the jaw 7 and two connecting rods 16, are mounted on two eccentric journals on the driving shaft 13 at each side of the jaw 7-The other ends of the connecting rods 16 are mounted on similarly disposed eccentric journals on a cross-shaft 17, which is mounted horizontally at the lower end of the other jaw &, parallel to the driving shaft 13 on the jaw 7- A V-belt drive pulley 20 is secured to the end of the driving shaft 13, and this pulley 20 is driven from a motor (not shown) in known manner. When the pulley 20 is driven, it rotates the driving shaft 13, so that the eccentric journals on the shaft 13 cause the jaw 7 to swing towards and away from the jaw 3. At the same time, the driving shaft 13 reciprocates the connecting rods 16, and the eccentric journals on the cross-shaft 17 cause the jaw 8 to swing towards and away from the jaw 7. The connecting rods 16 and the two sets of eccentric journals are designed such that the jaws 7 and S move towards and away from each other simultaneously, each jaw moving with the same velocity. '96191 Thus, each jaw acts with the same force on material to be crushed passing between said jaws.

To increase or decrease the distance which the jaw 8 moves, the orientation of the eccentric journals on the cross shaft 17 is altered. This is a simple operation, and may even be done while the apparatus is in use. Alternatively, provision may be made for adjusting the lengths of the connecting rods 16.

In the above-described apparatus, the jaws 7 and 8 are balanced i.e. each jaw transmits the same force in use. The major proportion of the force of each jaw is transmitted to the material being crushed, rather than to the opposite jaw. Because of these two factors, the apparatus can be mounted on a lightweight frame compared to the conventional stationary jaw type of crusher, in which a great deal of the force of the moving jaw is transmitted to the stationary jaw rather than to the stone, so that a very heavy supports frame is needed. It follows that the present apparatus is economical in its use of power, since most of the power used to move the jaws is used to crush the material. 188191

Claims (10)

WHAT WE CLAIM IS:-

1. A crusher including a pair of opposed crushing jaws, a pivotal mounting of each jaw for pivotal movement towards and away from the other jaw, means for driving said jaws to pivot towards each other simultaneously and away from each other simultaneously, whilst allowing them to pivot simultaneously in the same direction, the pivotal mounting of each jaw being adjacent one end of said jaw, said one ends of said jaws being located opposite each other, and the other ends of said jaws being located opposite each other.

2. The crusher as claimed in Claim 1 wherein means are provided for adjusting the minimum gap between the jaws when said jaws are swung towards each other.

3. The crusher as claimed in Claim 1 or 2 including a drive shaft rotatably mounted on one of said jaws, the drive shaft formed with an eccentric portion, a connecting rod pivotted at one end on the eccentric portion and at the other end to the other jaw, the connecting rod being pivotted to the drive shaft and the other jaw remote from the pivotal mountings of the jaws.

4. The crusher as claimed in Claim 3 including means for adjusting the distance between said pivots at the ends of the connecting rod.

5. The crusher as claimed in Claim 3 or 4 including N.Z PATEiYr ftciEgm-s 7 2 9 NO- ms 196191 one of said eccentric portions at each end of the drive shaft, one of said connecting rods pivotted on each of said eccentric portions, the said other ends of the connecting rods pivotted to the jaw and the connecting rods disposed on opposite sides of the jaws.

6. The crusher as claimed in Claim 4 or 5, in which said means for adjusting the distance between the pivots includes a further shaft pivoted on the said other jaw parallel to the drive shaft, the further shaft formed with a further eccentric portion, the said other end of the connecting rod rotatable on the further eccentric portion and clampable thereon, whereby partial rotation of the further shaft within the connecting rod will adjust the distance between said pivots-thereof.

7. The crusher as claimed in any preceding claim in which the pivotal mountings of the jaws are at or adjacent the top thereof and the means for driving said jaws is located at the lower half of the jaws.

8. The crusher as claimed in any preceding claim, in which the jaws form facing walls of a downwardly convergent hopper.

9. The crusher as claimed in any preceding claim, in which the jaws have opposing working faces which bear against material passing through the crusher, in order to crush the material, and at least one of- - 8 - 'u. ;-/uj T'S€'tlVF:0 196191 the working faces if formed with a plurality of parallel grooves extending towards the outlet for crushed material.

10. A crusher substantially as hereinbefore described with reference to and as shown in the accompanying drawings. IAN GORDON RODGER by his authorised agents P.L. BERRY & ASSOCIATES per: W - - y J >60 - 9 - RECEIVED