AU607786B2

AU607786B2 - Open-cut mining plant with an extraction device and a conveyor bridge

Info

Publication number: AU607786B2
Application number: AU19790/88A
Authority: AU
Inventors: Franz-Gunter Eschment; Peter Reinartz; Werner Rixen
Original assignee: Fried Krupp AG
Current assignee: Fried Krupp AG
Priority date: 1987-08-01
Filing date: 1988-07-22
Publication date: 1991-03-14
Anticipated expiration: 2008-07-22
Also published as: DE3725595A1; AU1979088A; DE3725595C2

Description

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COMMONWEALTH OF AUSTRALIA Patent Act 1952 C73) 7 (i CO0M PL ET E S P EC I FIC A TION

(ORIGINAL)

Class Int. Class Application Number Lodged Complete Specification Lodged Accepted This doxUrllint LO.flaifs the arnendincnts razdo under Sectio)n 49 ai~J is correct for priniting.

Published: 0 0 0 000 a0* 00 0 Priority :1 August 1987 Related Art Name of Applicant Address of Applicant Actual Inventor/s Address for Service *FRIED. KRUPP GESELLSCHAFT MIT BESCHRANKTER HAFTUNG *Altendorfer Strasse 103, D-4300 Essen 1, Federal Republic of Germany *Franz-Gunter Eschment Werner Rixen Peter Reinartz RICE CO., Patent Attorneys, 28A Montague Street, BALMAIN 2041.

Complete Specification for the invention entitled: open-cut mining plant with an extraction device and a conveyor bridge The following statement is a full description of this invention including the best method of performing it known to us/rae:- 1.

_7/e By:! Registerd Patent Attorney To: The Commissioner of Patents -COMMONWEALTH OF AUSTRALIA b. ,-A

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'N ACCEPTED AND AMENDMENTS -2 Description This invention concerns an open-cut mining plant, crawler trucks, consisting of a bucket wheel extraction device, a loader car and a conveyor length-adjustable conveyor belt, all according claim 1.

which is traversable on excavator or similar bridge equipped with a to the description of 00 0 0 0 0 0 o 00 0 00 0 00 o -1 In order to change the distance of the bucket wheel excavator from the conveyor, which transports the extracted material, the socalled face 0 conveyor, the equipment used nowadays are either centrally supported belt conveyor carriages or compound conveyor bridges, which are supported on both ends. Even though belt conveyor carriages are more mobile, the use 0 is restricted to lower extraction capacities, since the transfer of the extracted material at the joints causes difficulties. In contrast 0 hereto, the transfer does not cause any problems with the compound conveyor bridges due to the fixed transfer points, this is the reason why compound conveyor bridges are used for higher capacities. The disadvantage of the compound conveyor bridges is, however, their reduced mobility, which is particularly noticeable at the end of the working face, where the open-cut mining plant must reverse its working direction.

In order to enable reversal, a special recess must be cut into the working face with the bucket wheel excavator, which is extra work and means loss of time.

Apart from Lhis, difficulties may be experienced in the traversing of the bucket wheel excavator with the compound conveyor bridge along narrow winding tracks, in particular with the coordination between drive of the excavator and the loader car, which are connected to each other with the compound conveyor bridge.

Purpose of the invention is, to construct an open-cut mining plant in

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such a way that manoeuvering, in particular reversal of the working o direction is made easier iand is also possible on a narrower space The solution of this task can be seen in the features of the 1 characterizing par of claim 1.

o Qo0 The new open-cut mining plant permits the variation of the distance between the bucket wheel excavator and the loader car and thereby reduce the turning circle.

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0 4 A further improvement of the manoeuvability of the open-cut mining plant according to the invention is achieved in that the conveyor bridge may be detached from the bucket wheel excavator and can be moved independently through the loader car.

(AU 72.077/~l deic is aleda~- A compound conveyor device is already known.f. 1, 2 whereby the bridge is detachable from the open-cut mining device and can be shifted on its drive carriage up to its centre of gravity, however, this open-cut mining device is a spreader and the drive carriage is the track-bound undercarriage of a belt loop carriage.

If r r j e t -4 Purpose of the mobility of the known bridge is, to use it as an auxiliary spreader if the spreader itself is out of service. The maioeuverability of the known plant is not affected by the travel of the bridge.

Further advantageous forms of construction of the invention are subject of the claims 3 to 9.

One example of the construction of the invention is shown diagramatically in the drawing and is explained in the following. It is shown in

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oa I <f8 e a 4 0 0 0 o 4' o 0 0 4 a 04 440 o o oa Fig. 1 Fig. 2 an open-cut mining plant in working position the open-cut mining plant in manoeuvering position Fig. 3 0 04 a 4' 44 the conveyor bridge detached from the bucket wheel excavator section of the conveyor bridge in enlarged scale Fig.4 Fig. 5 to 7 details of fig. 4 in enlarged scale Fig. 8 Fig. 9 cross section along the line VIII VIII in fig. 4 in enlarged scale detail IX in fig. 3 in enlarged scale Fig. 10 v;iew in the direction of arrow X in fig. 9 Fig. 11 elevation of the connection between the bucket wheel excavator and the conveyor bridge Fig. 12 section along line XII -XII in fig. 11 and section along line XIII M ITI in fig. 11.

oo~ 0 4 o ItO alto Fig. 13

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A shown in fig. 1, end 1 of a conveyor bridge 2 is spatially hinged on the bogie 3 of a bucket wheel excavator 5 equipped with a crawler truck 4. The other end 6 of the conveyor bridge 2 is supported longitudinally adjustable through support rollers 7, which are formed through two links parallel to the axis, on a loader car 9 equipped with a crawler truck 8. The support rollers 7 are hereby arranged on both sides on a slewing ring 10, which pivots about the vertical axis of loader car 9. Loader car 9 shows further a conveyor bridge 11 transverse to its direction of travel, which at its discharge end is equipped with a transfer head 12, which may be connected to a face conveyor, not shown in the illustration.

4 04 0 0 4 In order to achieve the manoeuvering position of the open-cut mining plant shown in fig. 2, the loader car 9 moves forward from the position shown in fig. 1 towards the bucket wheel excavator 5 up to about the centre (relative to the centre of gravity) of the conveyor bridge 2, whereby the free endi 6 of the conveyor bridire 2 is lifted by a corresponding amount.

-6- In order to move, the loader car is turned about is central axis by means of the tracks of its crawler truck 8 and then turned back into the position shown in fig. 2 for manoeuvering.

In order to separate from bucket wheel excavator 5, as shown in fig. 3, two pairs of steering support rollers 13, 14 are brought into contact with the underside of conveyor bridge 2. Steering rollers 13 and 14 are each supported at the end of a lever 15 or 16, respectively, which with its other end is hinged parallel to the axis Of Support rollers 7 on the slewing ring 10. The steeriiig support roller pair 14 is located on the 0:0 side nearest to end 1 and steering support roller 13 on the opposite 0 0 side, near end 6 of conveyor bridge 2. After lifting end 1 by means of the steering support rollers, the conveyor bridge 2, following the 0detachment of the connection, may be moved independently in all directions with the aid of loader car 9.

A length-adjustable belt conveyor 17, also called telescopic belt, is 0 arranged within conveyor bridge 2, as can best be seen In fig. 4. The S belt loop 18 of the belt conveyor 17 is lead around a deflector pulley 19 mnounted in conveyor bridge 2 and is located underneath a belt carriage which carries the discharge end 21 of the belt conveyor 17 and is sup~ported through a pair of runner wheels 22 on a rail pair 23, which extend in the longitudinal direction of the conveyor bridge 2 in its lower region and underneath belt carriage 20. The belt loop 18 is guided on the inside through deflector pulleys 24, which are arranged on the endI of the belt carriage 20 nearest to the bucket wheel excavator. The other end of the belt carriage 20 carries a transfer head 25, which can be connected to loader car 9.

-7- A locking device 26 is mounted between the end of rails 23 and the transfer head 25, which, in the retracted position, locks belt carriage 20 on-to conveyor bridge 2, as shown in fig. 4.

Figs. 5 to 8 show details of conveyor bridge 2, of belt carriage 20 and transfer head 25 in an enlarged scale. Fig. 5 shows the location of stop blocks 27 at the end of rails 23 on one side and stop blocks 28 at belt carriage 20, which serve as travel limits of the loader car. For safety reasons, additional electrical limit switches are installed as well.

The locking device 26 at the other end of the bel t carriage 20 consists of two downwards pointing centering cones 29, arranged on either side of belt carriage 20, which engage in a correspondingly shaped socket of form 0 0 pockets 30 on belt bridge 2 (fig. 6) Fig. 7 shows Lhe connection 0 beiween bel t carriage 20 and the slewing ring 10 of loader car 9. On either side of transfer head 25, into which the end 21 of the conveyor belt 17 engages, the belt carriage 20 shows downward pointing lugs 31, 00 which carry one support roller 32 each at their lower ends. In the working position shown in fig. 1, the two axis-parallel support rollers 32 are each braced against a stop block 34 by means of a rocker lever 33, whereby the connection between transfer head 25 and loader car 9 is established. In this position, a chute 35 of the loader car 9 is located U underneath the transfer head After the conveyor belt 17 has been retracted into the position shown In fig. 4, the connection between belt carriage 20 and loader car 9 is loosened by release of rocker lever 33.

-8- This position also constitutes the limit of the positioning capacity of the loader car in working position. Furthermore, the truss of the conveyor bridge 2 is open in the lower part in this region, such that an opening 36 is established, as shownt in fig. 8 and indicated in fig. 4.

,klso, the support rollers 7 arranged on slewing ring 10 can be recognized in fig. 8, which support themselves against one rail 37 each, which is arranged in longitudinal direction in the region of the adjustment on the underside of the conveyor bridge 2. Following the release of the rocker lever 33, the support r'ollers 32 roll downwarids on an inclined rail 47, ttO which is mounted in the region of the rocker lever, as soon as the loader car 9 moves towards the centre of the conveyor bridge, whereby the simultaneously aligned parts of the locking device 26 become engaged.

000 Following the release of the belt carriage 20 from loader car 9, the loader car can traverse in the direction of the bucket wheel excavator so far until the position shown in fig. 9 is reached, which is about the centre of the conveyor bridge 2. Hereby the conveyor bridge 2 supports.

0itself on the support rollers 7 through A s rails 37. In order to S achieve a greater Support width, the levers 15 and 16 are lifted up by means of attached hydraulic cylinders 15' and 16' so far until the steering support rollers 13 and 14 also contact the rails 37. For the purpose of tracking, the rollers 13, 14 and 7 are equipped with wheel flanges on each side. Pinions not shown which are provided with a drive and are connected to levers 15, are mounted parallel to the axes of the steering support rollers 13 and engage Into toothed racks on the underside of the conveyor bridge 2, which run parallel to the rails 7.

This permits a small displacement of the conveyor bridge 2, which Is detached fromt the bucket wheel excavator, relative to the loader car 9.

9 S 9 However, instead of the toothed rack connection, a hydraulic shifting device, which may also serve as a connection security device, may be provided. For the release of the connection between the conveyor bridge 2 and the bucket wheel excavator 5, the end 1 of the conveyor bridge 2 is lifted with the hydraulic cylinders 16' so far, until the space-hinged connection is sufficiently separated from eacl other, after electrical and possibly other connections have been disconnected. In order to S reconnect the conveyor bridge 2 with the bucket wheel excavator 5 at the S end of the manoeuvering operation, an adjusting device 38 is provided for 0 convenience, which is mounted in a known roller table carrier platform 39 Q 00 in the region nearest to the conveyor bridge 2, and which is mounted pivotting about the vertical axis of the connection on the superstructure 0 0 0 S 3 of the bucket wheel excavator 5. Tle roller table carrier platform 39 has a guide track 40 on each side, which allows tilting of the conveyor 0 t bridge 2 about its longitudinal axis through rollers 41, which act together with the guide tracks 40. The adjusting device 38 is formed by S, a hydraulic cylinder 42, which is mounted on the underside of the 0 °o o conveyor bridge 2 and can be extended downwards and at its extendable end is equipped with a support roller pair 43, which engage into a rail 44 on the top of the roller table carrier platform 39. In order to make the i engagement easier, the guide rail 44 is made wider towards the outside.

Hydraulic cylinder 42 also serves preferably the lowering of end 1 of the conveyor bridge into the connection position with the bucket wheel excavator 5. Other means can be employed for the adjustment of the I connection, such. as electro-magnetic guiding devices.

I 0 4 120 Following the reattachment of the conveyor bridge to the bucket wheel excavator, the described operating cycles are carried out in reverse order, until the working position according to fig. 1 is reached. The extracted material can again be transferred from the bucket wheel excavator 5 through a chute 4 44, which is arranged at the end 1 of the conveyor bridge 2, through the belt conveyor 17 and the transfer head onto the belt conveyor of the conveyor bridge 11 of loader car 9, in order to reach the face conveyor through discharge head 12. Conveyor bridge 2 shows one spillage belt 45 and 46 each under the two ends of conveyor belt 17.

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Claims

1. An open-cut mining plant, which is traversable on crawler trucks, consisting of a bucket wheel excavator or similar extraction device, a loader car and a conveyor bridge equipped with a length-adjustable belt conveyor, which conveyor bridge is pivotally connected about one vertical axis with each of the bucket wheel excavator and the loader car, said conveyor bridge being longitudinally adjustable by '-ans of rails and support rollers, wherein the loader car is adjustable up to about the centre of the conveyor bridge, whereby the rails are mounted underneath np the length-adjustable belt conveyor, with a detachable *connection to the loader car.

2. An open-cut mining plant according to claim 1, wherein the conveyor bridge is detachable from the bucket wheel excavator and independently traversable through the loader car.

3. An open-cut mining plant according to claim 2, wherein steering support rollers are mounted on the loader car at least on the side of the support rollers nearest to the bucket wheel excavator, the steering support rollers oo 4 being height-adjustable and attachable to said rails.

4. An open-cut mining plant according to claim 2, wherein a drive arrangement comprising rack and pinion is mounted in the region of the centre of the conveyor bridge .otooo and can be engaged or disengaged.

An open-cut mining plant according to claim 4, wherein the pinion of the drive arrangement is connected coaxially with aic least one coaxial pair of the steering support rollers.

6. An open-cut mining plant according to any one of the previous claims, wherein the conveyor bridge is constructed as a box-type truss, where the lower stringer is left open in the region of the traversing path of a transfer head oi the conveyor. s 11" 12 I

7. An open-cut mining plant according to any one of the previous claims, wherein the conveyor bridge is flat on the underside.

8. An open-cut mining plant according to any one of the previous claims, wherein a transfer head of the length-adjustable belt conveyor is mounted at the end of a belt carriage for a belt loop of the belt conveyor, whereby the belt carriage is supported longitudinally adjustable on the conveyor bridge by means of at least one pair of running wheels.

9. An open-cut mining plant according to claim 8, wherein the belt carriage is lockable in its retracted position. An open-cut mining plant according to claim 9, wherein the locking device is formed via two i centering cones, which engage in corresponding sockets on form pockets located on the conveyor bridge. 11 An open-cut mining plant substantially as herein before described with reference to the accompanying o, drawings. Dated this 21st day of July 1988 o a FRIED. KRUPP GESELLSCHAFT MIT Vo BESCHRANKTER HAFTUNG Patent Attorneys for the Applicant F.B. RICE CO. I I i,