EP1646766A2

EP1646766A2 - Method and device for extracting extraction products in underground mining

Info

Publication number: EP1646766A2
Application number: EP04740079A
Authority: EP
Inventors: Reinhold Brüggemann; Detlef Hahn; Frank Fischer; Jochen Hammel; Jörg Wirtz; Norbert KATTHÖFER; Frank Herrmann; Harry Martin; Hans TÜMPNER; Victor Raul Encina Montenegro; Jaime Hernan Carreno Valdes; Juan Delgado; Fernando Arturo Geister BÜHLMANN; Pablo Antonio Letelier Parga
Original assignee: Corporacion Nacional del Cobre de Chile CODELCO; DBT GmbH
Current assignee: Corporacion Nacional del Cobre de Chile CODELCO; Caterpillar Global Mining HMS GmbH
Priority date: 2003-06-23
Filing date: 2004-06-18
Publication date: 2006-04-19
Anticipated expiration: 2024-06-18
Also published as: AU2004251183A1; US20060208555A1; AU2004251183B2; RU2006101677A; US7350874B2; CA2526264A1; EP1646766B1; CA2526264C; RU2334111C2; WO2005001245A2; WO2005001245A3

Abstract

The invention relates to a method and to an arrangement device for extracting extraction products in underground mines in caving. According to the invention, extraction products (20) breaking into an upper coal face (10) are extracted by means of at least one extraction funnel (13) or similar, into an extraction path (14) disposed practically underneath the coal face and are evacuated in said extraction path by means of an extraction conveyor (15). According to the invention, the extraction funnels (13) are arranged next to the extraction conveyor (15) and lead into a ramp surface (17), which is inclined, towards the extraction conveyor, with the lower end thereof. The extraction products extracted from the coal face by the extraction funnels are slidingly transported to the extraction conveyor via the inclined surfaces. The inclined sloped surface is, preferably, formed by a charge ramp (22) which is arranged in an extraction chamber (16) which branches off in a lateral manner from the extraction path, such that one of the high-lying ends (19) thereof is disposed below the extraction funnel and the other low-lying end thereof (23) forms an outlet (21) leading to the extraction conveyor.

Description

Title: Method and device for extracting extraction products in underground mining

The invention relates to a method for extracting extraction products in underground extraction operations in the quarry, in which extraction products or the like breaking in in an upper strut via at least one discharge funnel. in the lying mountains pulled off into a draw-off section opened underneath the strut and removed there by means of a take-off conveyor. The invention is further directed to an arrangement for extracting extraction products in underground extraction operations in the quarry, the extraction product after it has broken in in a mining streak via at least one extraction funnel or the like arranged in the prehistoric region of the mining cancer and open to a deduction path underneath the strut. is removable and can be removed by means of a take-off conveyor arranged in the take-off section. Finally, the invention also relates to a loading ramp, as can be used in a preferred manner in the method and the arrangement according to the invention.

In DE 100 46 497 AI, a method for extracting extraction products, in particular ores such as copper ore, has been proposed, in which ore or the like breaks off or intentionally breaks off from the roof after advancing an expansion device in an extraction strut. by means of discharge funnels, roller roofs or the like arranged in the horizontal of the strut. is subtracted in deduction stretches that are located below the strut and in which the funnel, roller holes or the like. bulk material entering the draw-off section is removed by means of conveyors.

The known method and the arrangement can be used as long as the extraction product which breaks off from the top of the extraction strut has a comparatively small, comparatively small average grain size, which allows extraction down into the extraction sections also through roller holes or extraction funnels with a comparatively small cross-section , The known method or the known arrangement is limited to the extraction of products with a small grain size, since an excessively large cross section of the discharge funnels or roller holes arranged above the discharge conveyors would result in an excessive amount of material reaching the discharge conveyor, which this cannot be removed reliably. The conveyor can then quickly be spilled by the extraction product that is actually to be requested. A further disadvantage of the known method is the high wear to which the discharge conveyors are also exposed when fine-grained material is obtained, because this falls essentially unrestrained in free fall through the discharge funnel into the discharge section and for the most part directly onto the conveying element of the discharge conveyor ,

The object of the invention is to improve the known method and the known arrangement so that it can also be used to extract debris with a large grain size that breaks into the face and can be transported away via extraction paths located below it.

This object is achieved according to the inventive method in that the at least one discharge hopper is arranged laterally next to the discharge conveyor and at its lower end in a ramp surface inclined towards the discharge conveyor passes, and that the extraction products are transported over the inclined ramp surface to the take-off conveyor.

The arrangement of the discharge funnel or the side next to the discharge conveyor and the deflection of the passage cross section of the funnel or funnel on the inclined ramp surface on the one hand ensures that the pile passing through the discharge funnel (s) from the strut into the discharge path before its transfer on the trigger conveyor is braked considerably, i.e. no longer reaches the conveyor element in practically free fall. In addition, because of the laterally offset arrangement of the discharge funnel or funnels, it is also possible to dimension its cross-section or parts considerably larger than in the previously known method and thus also to obtain larger fragments without these clogging the discharge funnel. The inclined ramp surface leads to a self-regulation of the amount of piles entering the discharge section through the discharge funnel, because only a limited amount of material can slide off per unit of time over the inclined ramp surface and reach the discharge conveyor. In this context, it is particularly advantageous if the outlet of the inclined ramp surface pointing towards the discharge conveyor is blocked by means of a shut-off device if the degree of filling of the discharge conveyor exceeds a predetermined level. For the reliable removal of the extracted ore, it can be advantageous if the extraction product reaching the extraction conveyor via the ramp surface is comminuted before or when it is transferred to the extraction conveyor, in any case the parts of the extracted product which are so large that they are not or can only be transported to a limited extent by the conveyor. Furthermore, it can be advantageous if the extraction products located in the outlet of the ramp surface are transported in the direction of the take-off conveyor by means of an activatable conveying device, so that the transfer of the won Pile on the discharge conveyor is ensured in any case.

In line with the method according to the invention, the arrangement according to the invention is characterized by a loading ramp with a ramp surface which is oriented essentially transversely to the conveying direction of the discharge conveyor and has an inclined ramp surface, the one of which has a higher end below the discharge funnel and the other, lower one End forms an outlet to the discharge conveyor. In order to be able to mount the loading ramp below the discharge funnel in a particularly simple manner and also to enable regular maintenance and repair work, it is particularly advantageous if an auxiliary section arranged behind the loading ramp and running essentially parallel to the removal section is provided. through which the loading ramp is accessible from the rear.

The loading ramp expediently has a loading ramp frame arranged in the area below the discharge conveyor and a base plate arranged on the lying surface. The base plate can be braced against the mountains with at least one, preferably two stamps.

In a preferred embodiment of the invention, the inclination of the ramp surface varies over its length, the ramp surface then expediently having a greater inclination below the discharge funnel than in the outlet area to the trigger unit. The ore rock extracted by the extraction funnel is slowed down by the decreasing inclination of the ramp surface as it passes over it, so that it only hits the extraction requester at a low speed. It is also particularly advantageous if the inclination and / or the height of the ramp surface or the baffle plate of the loading ramp or its loading ramp frame that forms it can be adjusted. The arrangement can be such that the ramp surface or the baffle plate forming it can be pivoted on its rear side facing the auxiliary section. In addition, it is possible in an advantageous manner that the ramp surface or the baffle plate forming it can be fixed on its front facing the draw-off section by means of a plug connection at different heights on the loading ramp frame. This makes it possible to optimally adapt the loading ramp to different underground conditions or to different extraction conveyors or other peripheral units. This configuration also facilitates repair work on the loading frame or may even make it possible in the first place

In a particularly advantageous development of the invention, the loading ramp is provided with a blocking device. This can be arranged in the outlet area or in front of it. In a preferred embodiment, the blocking device can consist essentially of at least one pivotable locking flap which, depending on its position in the outlet area of the loading ramp, increases or decreases its passage cross-section for the product obtained. Since the forces exerted on the locking flap by the extraction product can be considerable, it is expedient if the pivoting drive of the locking flap essentially consists of at least one hydraulic cylinder.

The locking flap can be pivotable about an essentially horizontal axis and can preferably be formed by a section of the ramp surface in its outlet area. In this embodiment, the inclination of the ramp area in the exit area is varied, if necessary, so far that the inclination of the ramp surface is set to zero or even a negative inclination is set, i.e. the loading ramp no longer forms a sliding surface that continuously inclines towards the conveyor, but rather an approximately V-shaped channel, in which the rock emerging from the discharge funnel is at least temporarily collected ,

An alternative, advantageous embodiment results if the locking flap is essentially formed by a segment or sector closure, which has a preferably curved baffle wall that separates the point of application of the ramp surface from the run-out area if required and can be pivoted in height about the horizontal axis via at least one swivel arm , Here, the butterfly valve works very similar to a water barrier. The preferably arched baffle has the particular advantage that the segment or sector lock can also be moved into its locking closed position if the baffle of rock o. the like is applied.

Another embodiment is also conceivable, in which the locking flap can be pivoted about an essentially vertical axis and is formed by at least one, preferably two, door flap (s) which can be pivoted like a gate above the outlet area of the ramp surface. By swiveling the gate flap (s), the passage cross-section between the free sides of the gate and if necessary. a side limitation of the ramp area can be set very sensitively. A further alternative is obtained if the shut-off flap is formed by at least one pivoting element which extends downward from the hanging part of the extraction line or an expansion frame and can be pivoted at its upper end about an approximately horizontal pivot axis which runs essentially parallel to the extraction conveyor. In a further, alternative embodiment of the blocking device, the blocking device can essentially consist of a sectional door running in lateral guide rails with a plurality of blocking segments which are connected to one another in an articulated manner. Similarly, it is conceivable that the blocking device essentially consists of a roller shutter which can be rolled up on a horizontal shaft arranged above the ramp surface and has a plurality of blocking segments which are connected to one another in an articulated manner. In these two embodiments, or in general, it is also possible for the blocking device to have at least one pendulum flap which is mounted to oscillate about a horizontal axis, or to be formed therefrom. It is particularly advantageous if a plurality of swing flaps are articulated to one another to form a swing flap curtain that forms the blocking device.

In the outlet area, the loading ramp can have or form a conveying device which conveys towards the take-off conveyor, with which it can feed parts of the extraction product which do not reach the conveyor automatically due to the inclination of the ramp surface. The conveying device can be, for example, a vibrating trough or an oscillating conveyor. It is particularly advantageous if the conveying device has a sliding plate or essentially consists of one. This sliding plate can preferably be arranged on an inclined upper side of a wedge loader that can be inserted into or under the pile on the discharge path-side front of the loading ramp or its loading ramp frame. The arrangement is then preferably made such that the wedge loader can be advanced in the direction of the draw-off path by means of impression cylinders. These impression cylinders can be supported on the base plate of the loading ramp or its loading ramp frame; in many cases it is even more useful if the impression cylinders are located on a bed support the hanging and bracing spreading frame with spreading cylinder.

The sliding plate can preferably be driven by at least one clearing cylinder, which, for example, can be arranged substantially parallel to the inclined top of the wedge loader below a fixed cover plate and on the one hand on a fixed bearing on the wedge loader and on the other hand on a part of the wedge loader that can be displaced by means of the clearing cylinder Broach supports. The clearing bar is preferably arranged at the front end of a sliding plate lying on the cover plate and displaceable over it.

In a further embodiment of the invention, the conveying device is arranged at least partially below the ramp area on the loading ramp frame and, in its operating state, protrudes out of the latter on its front side pointing towards the discharge conveyor. The conveyor can be pushed in a compact structural unit from the back of the loading ramp frame to the front thereof in the direction of the discharge conveyor. In particular, it is possible for the conveying device to be installable from the rear of the loading ramp under the loading ramp frame in the front outlet area of the loading frame. In particular, this configuration also enables the conveyor device to be replaced easily, for example if it is damaged or worn. The worn or damaged device can be removed in a particularly advantageous manner with the aid of the trigger conveyor, in that the conveyor device is pushed forward to the trigger conveyor by means of push-in cylinders supported on the base plate of the loading ramp or a spreading frame and after uncoupling from the cylinders and further Pass existing connections to the loading ramp to the conveyor for removal becomes. The "new" conveyor is then transported through the auxiliary section from the rear of the loading ramp and brought into its working position.

In order to prevent too large parts of the extraction product from reaching the conveyor, it is particularly advantageous if the loading ramp is assigned a comminution device for extraction products, which can essentially consist of a crusher arranged in the outlet area of the loading ramp, in particular an impact roller crusher or jaw crusher , However, it has proven to be particularly advantageous if the comminution device essentially consists of a chisel and / or rotary hammer which is effective in the outlet area of the loading ramp and is arranged above the ramp surface and with which particularly large piles of workpieces can be comminuted in a targeted manner. Preferably, the chisel and / or rotary hammer is arranged depending on the slope of the draw-off section or a rail track arranged thereon and can be moved in the longitudinal direction of the draw-off conveyor at least over the width of the loading ramp.

A further preferred embodiment of the invention results if the loading ramp is assigned a mesh screen, which can be arranged above the shaking channel, for example. With the help of such a vibrating sieve, also known as a grizzly, it is possible to classify the extraction product on the conveyor before it is put in place and to initially hold large parts of the heap to shred them before transferring them to the conveyor, while smaller lumps of extraction product pass through the sieve mesh unhindered can. It is particularly advantageous if the mesh screen is coupled to the shaking channel, which supports the classification process and even a shredding of brittle piles is caused solely by the sieve.

It has proven to be advantageous if the grating screen has at least one screen surface which is variable in its inclination relative to the loading ramp, the arrangement being able to be such that the grating screen has two articulatingly connected screen surface parts which can be erected roof-like above the loading ramp. The changing position of the screen surface causes different screen results that can be adjusted to different needs. In addition, by setting up its screen surface or parts of the screen surface, the mesh screen can also serve as a shut-off device at least for the larger parts of the pile brought up by the discharge funnel, and thus possibly an additional blocking device. replace completely or make redundant.

The discharge conveyor can be arranged below the outlet area of the loading ramp, which facilitates material transfer. The loading ramp is preferably provided at the free end of its outlet area with a loading flap spanning a side wall of the discharge conveyor, so that the product obtained does not get between the latter and the loading ramp when it is transferred to the conveyor.

The take-off conveyor can be a chain scraper conveyor or preferably a vibratory trough conveyor, as is usually used in underground mining.

The invention provides a loading ramp for extracting extraction products in underground extraction operations in quarry construction, in particular for use in the method according to the invention and in the arrangement, with a loading ramp pen frame, which has on its top a ramp surface sloping downwards from a feed point to an outlet area with a final loading flap, a blocking device with at least one adjustable locking element being provided in the outlet area, the adjustment of which allows the passage cross section above the ramp surface to be varied towards the loading flap. The inclination of the ramp surface can preferably vary over its length, the ramp surface then preferably having a greater inclination below the discharge funnel than in the outlet area. A pivotable locking flap can preferably be used as the locking member.

The locking flap of this loading ramp can be pivotable about an essentially horizontal axis and can be formed by a section of the ramp surface in its outlet area. Another very advantageous embodiment results when the locking flap is essentially formed by a segment or sector lock, which has a preferably arched baffle wall that separates the point of application of the ramp surface from the run-out area if required and can be pivoted in height about the horizontal axis via at least one swivel arm ,

It is also possible if the locking flap can be pivoted about an essentially vertical axis and is formed by at least one, preferably two, door flap (s) which can be pivoted in a gate-like manner above the outlet region of the ramp surface. The loading ramp can have or form a driven shaking channel in the exit area and it is possible that the inclination of the ramp surface of the loading ramp can be changed at least in the exit area.

Finally, it is also expedient if a mesh screen is assigned to the loading ramp. This can be above the shaking arranged trough and is coupled in a particularly advantageous embodiment of the invention with the shaking trough.

The grating screen can have at least one screen surface that is variable in its inclination relative to the loading ramp, preferably it has two screen surface parts which are connected to one another in an articulated manner and can be set up like a roof above the loading ramp.

Further features and advantages of the invention result from the following description and the drawing, in which preferred embodiments of the invention are explained in more detail by means of examples, in which:

Fig.l an underground mining operation for copper ore extraction on average;

2 shows a withdrawal route in the extraction operation according to FIG. 1 on average along the line II -II;

3 shows a first embodiment of the arrangement according to the invention for performing the method according to the invention in a section along the line III-III in FIG. 2;

4 shows the subject of FIG. 3 in a perspective illustration, with the mountains surrounding the arrangement being omitted;

5 shows a second embodiment of the arrangement according to the invention for performing the method according to the invention in a perspective view; 6 shows the subject of FIG. 5 in a first working position of the loading ramp in a view;

7 shows the subject of FIG. 6 in a second working position of the loading ramp in a view;

8 shows a third embodiment of the arrangement according to the invention for carrying out the method according to the invention in a representation corresponding to FIG. 7;

9 shows a fourth embodiment of the arrangement according to the invention for carrying out the method according to the invention in a representation corresponding to FIG. 3;

10 shows a fifth embodiment of the arrangement according to the invention for carrying out the method according to the invention in a representation corresponding to FIG. 3;

11 shows a sixth embodiment of the arrangement according to the invention for carrying out the method according to the invention in a perspective view;

12 shows a seventh embodiment of the arrangement according to the invention for carrying out the method according to the invention in a representation corresponding to FIG. 3;

Figure 13 shows the subject of Figure 11 in a section along the line XII-XII; 14 shows an eighth embodiment of the arrangement according to the invention for carrying out the method according to the invention in a representation corresponding to FIG. 3;

15 shows the object of Figure 14 in a perspective view obliquely from above;

16 shows a perspective view of a ninth embodiment of the arrangement according to the invention for carrying out the method according to the invention;

17 shows the subject of FIG. 16 in a representation corresponding to FIG. 3;

18 shows a further embodiment of a loading ramp according to the invention, in particular for use in the embodiment of the arrangement according to the invention according to FIGS. 16 and 17, in a perspective illustration; and

Fig. 19 the conveyor of the loading ramp according to Fig. 18 in a longitudinal section.

Fig. 1 shows an underground mining operation for extracting copper ore, which is about 40 meters thick. The first extraction step takes place in a manner known per se in longwall construction with expansion racks 11 advancing in a mining strut 10 and an associated extraction and loading device, which are not shown in detail here and are not to be described in detail. The extraction facility can be one of these yours, as described for example in DE 100 46 497 AI, to which reference is hereby made.

The copper ore is mined only in the lower part of its entire thickness with the quest for mining; the much larger part of the existing copper ore, which forms the slope at the passage of the mining cancer, collapses after the passage of the mining site and is extracted for its extraction by means of extraction funnels 13 arranged in the lying area 12 of the mining cancer 10, in order to over below the mining cancer in one Height distance of about six meters of deduction sections 14 to be removed by means of deduction conveyors 15.

In Fig. 2 - on a smaller scale - the withdrawal section 14 shown in longitudinal section in Fig. 1 is shown in a plan view. It can be seen that the discharge funnels are arranged laterally next to the discharge conveyor 15, specifically at a distance of preferably about four to eight meters from the conveyor running in the discharge section. A plurality of discharge funnels are provided on each side over the entire length of the discharge path or the conveyor arranged therein, the arrangement being such that the left and right discharge funnels are offset from one another in the longitudinal direction of the path.

Discharge chambers 16, in which inclined ramp surfaces 17 are located, into which the discharge funnels 13 merge with their lower end 18 by the pulling funnels 13 with their lower end 18, are opened to the discharge funnels located at a lateral distance from the discharge path or the conveyor arranged therein open above a feed point 19 of the ramp area. Over the inclined ramp surfaces in the discharge chambers, the pile 20 passing through the discharge funnel 13 can slide laterally into the discharge section 14 and over an outlet 21 of the ramp surface be transferred to the discharge conveyor 15.

As can be seen from FIGS. 3 to 8, the inclined ramp surface 17 in each discharge chamber 16 is part of a loading ramp 22 made of a steel structure, the upper side of which it forms. The loading ramp is set up in its discharge chamber 16 in such a way that the higher end of the ramp surface with the loading point 19 is below the discharge funnel 13, while its other, lower end 23 forms the outlet 21 towards the discharge conveyor 15. As can be clearly seen in FIG. 3, the inclination of the ramp surface 17 can vary over its length, wherein it has a greater inclination below the discharge funnel 13 than in the discharge area 21 to the discharge conveyor 15. In the discharge area 21 there is the loading ramp 22 with a blocking device 24 3 and 4, the first embodiment essentially consists of two guide plates 25 which laterally delimit the ramp surfaces in their run-up area and gate flaps 27 which are pivotally connected to these about vertical axes 26 and which on the one hand have the guide plates and on the other hand hydraulic cylinders 28 acting on the gate flaps can be pivoted inwards towards one another about the vertical axes 26 and as a result can narrow the passage cross section 29 in the outlet area 21 for the extraction product 20 obtained or can also completely close it if required.

In the second embodiment of the arrangement according to the invention shown in FIGS. 5 to 6, the blocking device 24 is formed by the front section 30 of the ramp surface in its outlet area 21, which for this purpose can be pivoted about a horizontal axis 31 and with the aid of two lifting cylinders 32 the completely lowered position shown in FIG. 6 into the raised position shown in FIG. 7 can be brought in which the loading ramp forms an approximately V-shaped collecting trough 33 for the pile. In this embodiment, the front section 30, which can be pivoted about the axis 31 by the lifting cylinders 32, is designed as a driven shaking channel 34, ie an oscillating movement directed transversely to the longitudinal direction of the draw-off section can be impressed here, which movement is only slightly lower than the horizontal axis 31 Position of the front portion 30 supports the transport of the pile 20 on the discharge conveyor.

In the third embodiment of the arrangement according to the invention shown in FIG. 8, the blocking device is formed by a pivot 35, which at its upper end can be pivoted about a horizontal pivot axis 36, which runs essentially parallel to the trigger 15, and which is located in the trigger section 14 arranged expansion rack 37 is located. To release the passage cross section 29, the swing arm can be pivoted into an upper position shown in dashed lines in FIG. 8 by means of a hydraulic drive (not shown), in which it lies essentially against the upper crossbar 37a of the expansion frame. In order to substantially completely close the passage cross-section 29, the swing arm is brought into its lowered position, shown in solid lines in FIG. 8, in which it ends with its lower end immediately above the ramp surface 17.

In the fourth embodiment according to FIG. 9, a blocking flap in the form of a segment closure 46 is provided as a blocking device, which has a baffle wall 47 that is curved around the horizontal pivot axis 31. The baffle wall is provided with two lateral pivot arms 48, which are pivotably mounted about the pivot axis 31. The arrangement is so hit that the baffle wall 47 is on the discharge path of the recovered pile from the feed point 19 to the outlet area 21 in front of the pivot axis 31. To release the trigger, the shut-off flap can be pivoted downward and the baffle wall 47 can be sunk into a space 50 provided below the ramp 17 through a slot 49 arranged between the feed point 19 and the outlet 21. A hydraulic cylinder drive (not shown) is also provided here for actuating the flap.

It can be seen from the drawing that the baffle 47 can completely close off the part of the discharge chamber 16 located above the ramp surface 17 up to the slope, while it also completely clears the passage when the shut-off valve is completely lowered.

In the embodiment of the invention shown in FIG. 10, the blocking device 24 essentially consists of a sectional door 51, which essentially consists of a plurality of shut-off segments 52 which are connected to one another in an articulated manner. As is known per se in sectional doors, the shut-off segments 52 are provided at their ends with guide and support rollers which run in lateral guide rails 53. The guide rails 53 are attached with a first section 54 above the outlet on the slope of the discharge chamber 16 and pass in the direction of the feed point 19 with a radius 55 into a second, inclined section 56, which ends a little way above the ramp surface 17. At the lowest shut-off segment 52a, a pendulum flap 57 is connected in an articulated manner, which is not laterally guided in the guide rails 53, but instead hangs vertically downwards due to its own weight and, in the closed position of the sectional gate 51, the above the ramp surface 17 to the beginning of the second section 56 of the Guide rails 53 closes remaining gap 58. The embodiment shown in FIG. 11 shows a similar design. Instead of a segment gate with side guides, the length of which is dimensioned such that all the shut-off segments are arranged one behind the other, even when the gate is completely open, the blocking device 24 here consists of a roller gate 60 with a plurality of hinged-shut-off segments 61 which are connected to one another Above the ramp surface 17 directly below the hanging horizontal shaft 61 can be wound. Lateral guide rails 63 are also provided here via the actual opening path or the lifting height, in which the shut-off segments 61 run when the roller shutter is opened and closed. A lower pendulum flap 64 also provides the lower end to the ramp surface when the gate is completely closed.

In the embodiment shown in FIGS. 12 and 13, the blocking device 24 consists of a pendulum flap curtain 65, which consists of a plurality of pendulum flap elements 66 which are connected to one another in an articulated manner, the uppermost of which is attached to the hanging wall. As a result of its high dead weight, the pendulum flap curtain 65 closes the discharge chamber until the rock pressure on its rear side 67 on the feed side is large enough to press the pendulum flaps 66 towards the outlet and thus open up a passage gap. The maximum height of the passage gap can be set in that one or more of the pendulum flap elements 66 starting from the hanging side or the like by means of locking bolts (not shown). be locked on side locking rails 68.

With the help of the various blocking devices, it is possible to narrow the outlet 21 of the inclined ramp surface or to block it completely if the degree of filling of the trigger fδrderers threatens to get too big. This effectively prevents overloading the discharge conveyor.

In order to shred large pieces of heap that reach the ramp area of the loading ramp through the extraction funnel, before they are transferred to the triggering device to a size suitable for this purpose, a shredding device 38 for such parts of the extraction products is assigned to the loading ramp of the arrangement according to the invention. In the first two exemplary embodiments of the arrangement according to the invention, the comminution device 38 essentially consists of an hydraulic chisel or hammer drill 39 which is effective in the outlet area 21 of the loading ramp 22 and is arranged above the ramp surface 17 and which hangs on a rail track 41 arranged on the hanging line 40 of the extraction section 14 is arranged and can be moved in the longitudinal direction of the discharge conveyor. In the embodiment shown in FIG. 5, the rail track 41 also has a branch 42 into the discharge chamber 16, so that the hydraulic hammer drill 39 can be moved close to the discharge funnel 13 and already have large fragments of the aggregate falling through the funnel the feed point 19 of the ramp surface 17 can shred.

It can be seen from the drawings relating to the first and second exemplary embodiments that the discharge conveyor 15 can be arranged below the run-up area 21 of the loading ramp, the loading ramp being expediently provided at the free end of its outlet area 21 with a loading flap 44 which overlaps a side wall 43 of the discharge conveyor 15, so that even small-grained piles cannot get into the space 45 between the conveyor and the loading ramp. In the exemplary embodiments shown, the discharge conveyor is designed as a vibrating trough conveyor, but it is also possible lent to use another type of conveyor for this, for example a chain scraper conveyor.

A very advantageous embodiment of the discharge and transfer area of the loading ramp is shown in FIGS. 14 and 15. Here, the loading ramp 22 is assigned a grating screen 70 (grizzly) in its lower area, which is arranged above the shaking channel 34 and coupled to it. The arrangement is such that the screen 70 has two articulated screen parts 71, 72, which are variable in their inclination relative to the loading ramp 22, so that the two parts roof-like above the loading ramp with the aid of a hydraulic drive o. the like can be set up, as can be clearly seen in the drawing. The screen 70 effects a classification of the aggregate obtained in such a way that only rock of a grain size is given to the discharge conveyor 15, which can pass through the screen 70, ie fall through its mesh or pass over the ridge 73 of the "screen roof". Larger pieces of rock are initially retained by the sieve and can be comminuted using a suitable comminution device, which is not shown in FIGS. 14 and 15, but which can be designed, for example, as in one of the other embodiments. Particularly in the case of slightly brittle piles, the initially larger rock parts are already crushed by their pressure on the bars of the wire mesh XY, so that in such cases an additional size reduction device can be dispensed with. By lowering the two roof surface parts 71, 72 set up in a roof-like manner, the extraction chamber can also be completely released for large rock parts. Conversely, it is also possible with the mesh screen to block the fume cupboard by setting up the screen surfaces and then blocking the fume cupboard in front of the screen by means of the screen is added. A separate blocking device can then be dispensed with in particular if the product obtained is not brittle and is therefore not broken up into smaller parts by itself on the bars of the sieve.

16 and 17 finally show a further embodiment of the arrangement according to the invention, it being possible for the loading ramp used there to also be designed as shown in FIGS. 18 and 19. In this further embodiment of the arrangement according to the invention, an auxiliary section 74 is arranged behind the loading ramp (s) 22 and is raised parallel to the withdrawal section 14 at a somewhat higher level than this. The withdrawal chamber 16 receiving the loading ramp 22 is connected at its rear end to the auxiliary section, as can be clearly seen in the figures, so that the auxiliary section provides access to the withdrawal chamber or the loading ramp arranged therein. The loading ramp or parts of it can be introduced into its discharge chamber through the auxiliary section and access is also particularly easy from here for repair purposes.

It can be seen that in this embodiment the loading ramp 22 consists essentially of two main elements, namely a loading ramp frame 75 which forms the part of the ramp surface 17 below the discharge funnel 13 and a conveyor device 77 which at the The embodiment shown in FIGS. 16 and 17 is still in a rest or pre-assembly position below the baffle plate 76 inside the loading ramp frame 75.

The loading ramp frame 75 has a base plate 78 resting on the lying L in the discharge chamber 16 with connecting flanges 79 for two impression cylinders 80 which are connected to their other, piston rod ends are articulated to the conveyor 77. When the impression cylinders 80 are extended, the conveying device 77 is advanced from its preassembly position shown in FIGS. 16 and 17 in the direction of the take-off section 14 and thereby emerges from the front of the loading ramp frame 75 below its upper baffle plate 76. The pile lying in front of the loading ramp frame, not shown in the drawing, is passed underneath by a wedge piece 81 which is attached to the front of the conveyor device for the correct positioning of the conveyor 77 in front of the loading ramp frame 75 and which the pile when the conveyor 77 is pushed forward lifts upwards or pushes in the direction of the take-off section, where it falls on the lower-lying take-off conveyor 15. When the conveyor 77 is in its desired position, the wedge piece 81 projects into the draw-off section 14; it is then dismantled from the conveyor and can be removed with the help of the discharge conveyor 15. The loading ramp is then ready for operation.

In the embodiment shown in FIGS. 16 and 17, the conveying device 77 is an oscillating conveyor 82, in the case of the vibration exciter (not shown in more detail) driving an oscillating device (not shown) in such a way that the pile arriving on the conveyor accelerates and at the point of reversal Vibration is thrown off the discharge conveyor. Vibratory conveyors of this type are built comparatively high and can only deliver effectively up to a certain height of the carpet of material lying on them, since if the maximum height is exceeded, there is no longer any throwing movement. In most cases, a device with a sliding plate 83, as shown in FIGS. 18 and 19, is therefore advantageous as the conveying device. The embodiment of the loading ramp 22 according to the invention shown in FIGS. 18 and 19 differs from the loading ramp according to FIGS. 16 and 17 essentially only in the type and the rear support of its conveyor 77. The conveyor 77 here is a comparatively low sliding plate 83, which is arranged on the top 84 of a wedge loader 85 which can be pushed into or under the pile. The wedge loader 85 can be advanced by means of two impression cylinders 80 in the direction of the excavation section in order to bring it into its correct working position, as is also the case with the conveyor device in the embodiment according to FIGS. 16 and 17 in a similar manner described above. 18 and 19, the impression cylinders 80 are not supported on the base plate 78 of the loading ramp frame 75, but on a spreading frame 86 which has two spreading cylinders 87 with which it lies between the horizontal L and the Hanging 40 is braced in the pull-off chamber behind the loading ramp frame 75.

The sliding plate 83 itself has four broaching cylinders 89 arranged parallel to one another on the upper side of the wedge loader 85 below a cover plate 88, which are supported on the one hand on fixed bearings 90 on the wedge loader 85 and are connected with their piston rod-side front end to a broaching bar 91, which they move forward or backward over the top 83 of the wedge loader 85 when it is loaded. The arrangement is such that the clearing bar 91 is arranged at the front end of a sliding plate 92 lying on the cover plate 88 and displaceable over this, so that the clearing cylinder 89 is always completely under the cover and the sliding plate regardless of the position of the clearing bar 91 lie and are so protected from the slipping pile. One recognizes that the conveyor device 77 in the two embodiments shown in FIGS. 16 to 19 is arranged at least partially below the ramp surface 17 on the loading ramp frame 75 and, in its operating state, protrudes from the front side 93 thereof pointing towards the discharge conveyor 15. It can also be seen that the conveyor 77 can be pushed in a compact unit from the rear 94 of the loading ramp frame 75 to the front 93 thereof in the direction of the discharge conveyor 15 and that the conveyor 77 from the rear 94 of the loading ramp 22 below the loading ramp frame 75 in the front Outlet area of the loading frame 22 can be installed.

Finally, it can also be seen in FIG. 18 that the inclination and / or the height of the ramp surface 17 or the baffle plate 76 of the loading ramp 22 or its loading ramp frame 75 which forms it can be adjusted. For this purpose, the ramp surface 17 or the baffle plate 76 forming this is pivotally received on its rear side 94 facing the auxiliary section 74 on two upstanding supports 95 of the frame 75 in pivot bearings 96, while on its front side 93 facing the trigger section 14 by means of a plug connection 97 in different heights on the loading ramp frame 75 can be set.

The invention is not limited to the exemplary embodiments shown and described, but a number of changes and additions are conceivable without departing from the scope of the invention. For example, in the simplest embodiment of the method and the arrangement according to the invention, it is possible to completely dispense with a loading ramp in the form of a frame arranged in the extraction chamber and to obtain the inclined ramp surface by correspondingly inclining the bottom of the extraction chamber, i.e. the inclined ramp surface directly in the Open mountains. The- This particularly inexpensive variant of the invention can be used in particular where a precisely determined angle of the inclination and in particular a change in the inclination is not important in any case in some areas of the ramp area. The locking flap of the blocking device can also be arranged directly depending on the slope 40 of the draw-off section, the function and direction of movement of which corresponds to that of the pivot 35 in the third embodiment. Instead of a hydraulic hammer drill as a crushing device, a crusher arranged in the discharge area of the ramp prior to transfer to the conveyor, for example an impact roller crusher or the like, can also be used in individual cases for this purpose. be used.

Claims

Expectations :

1. Method for winning in extraction products in underground extraction operations in the quarry, in which extraction products breaking in in an upper strut or the like via at least one discharge funnel. in the lying mountains pulled off into a draw-off section opened below the strut and removed in this by means of a take-off conveyor, characterized in that the at least one take-off funnel (13) is arranged laterally next to the take-off conveyor (15) and at its lower end (18) into a ramp surface (17) inclined towards the discharge conveyor (15), and that the extraction products (20) are transported over the inclined ramp surface (17) to the trigger conveyor (15).

2. The method according to claim 1, characterized in that the discharge conveyor (15) facing outlet (21) of the inclined ramp surface (17) by means of a blocking device (24) is blocked when the degree of filling of the discharge conveyor (15) exceeds a predetermined level ,

3. The method according to claim 1 or 2, characterized in that the extraction product (20) arriving via the ramp surface (17) to the deduction conveyor (15) is comminuted before or upon its transfer to the deduction requester (15).

4. The method according to any one of claims 1 to 3, characterized in that the extraction products located in the outlet (21) of the ramp surface (17) by means of an activatable conveyor (77) are transported in the direction of the discharge conveyor (15).

5. Arrangement for the extraction of extraction products in underground extraction operations in the quarry, the extraction product after its collapse in a mining streak via at least one extraction funnel or the like arranged in the prehistoric region of the mining cancer, to an extraction path open below the strut. is removable and can be transported away by means of a discharge conveyor arranged in the discharge section, characterized by a loading ramp (22) with a ramp surface (17) which is oriented essentially transversely to the conveying direction of the discharge conveyor (15) and has one, higher end thereof (19) is located below the discharge funnel (13) and the other, lower end (23) of which forms an outlet (21) towards the discharge conveyor.

6. Arrangement according to claim 5, characterized by an behind the loading ramp (22), substantially parallel to the draw-off section (14) extending auxiliary section (74) through which the loading ramp (22) from its rear (94) is accessible.

7. Arrangement according to claim 5 or 6, characterized in that the loading ramp (22) has a loading ramp frame (75) arranged in the region below the discharge funnel (13).

8. Arrangement according to one of claims 5 to 7, characterized in that the loading ramp (22) or its loading ramp frame (75) has a bottom plate (78) arranged on the lying surface (L).

9. Arrangement according to claim 8, characterized in that the base plate (78) can be braced against the mountains with at least one, preferably two stamps.

10. Arrangement according to one of claims 5 to 9, characterized in that the inclination of the ramp surface (17) varies over its length, the ramp surface below the discharge funnel (13) has a greater inclination than in the outlet region (21) to the discharge conveyor (15th ).

11. Arrangement according to one of claims 5 to 10, characterized in that the ramp surface (17) or the baffle plate forming this (76) of the loading ramp (22) or the loading ramp frame (75) in their inclination and / or their height adjustable is.

12. The arrangement according to claim 11, characterized in that the ramp surface (17) or the baffle plate forming this (76) on its rear side pointing towards the auxiliary section (94) is pivotable.

13. Arrangement according to claim 11 or 12, characterized in that the ramp surface (17) or the baffle plate forming this (76) on its towards the trigger section (14) facing front (93) by means of a plug connection (97) at different heights on Loading ramp frame (75) can be fixed.

14. Arrangement according to one of claims 5 to 13, characterized in that the loading ramp (22) is provided with a blocking device (24).

15. The arrangement according to claim 14, characterized in that the blocking device (24) is arranged in the outlet region (21) of the loading ramp.

16. The arrangement according to claim 14, characterized in that the blocking device (24) is arranged in front of the outlet area (21) of the loading ramp.

17. The arrangement according to claim 15 or 16, characterized in that the blocking device (24) consists essentially of at least one pivotable locking flap (27; 30; 35; 46).

18. The arrangement according to claim 17, characterized in that the pivot drive of the locking flap (27; 30; 35) consists essentially of at least one hydraulic cylinder (28, -32).

19. The arrangement according to claim 17 or 18, characterized in that the locking flap is pivotable about a substantially horizontal axis (31).

20. The arrangement according to claim 19, characterized in that the locking flap is formed by a portion (30) of the ramp surface (17) in its outlet area (21).

21. The arrangement according to claim 19, characterized in that the locking flap is essentially formed by a segment or sector closure (46), which preferably a curved, the feed point (19) of the ramp surface (17) from the outlet area (21) if necessary Storage wall (47) which has at least a swivel arm (48) can be swiveled in height about the horizontal axis (31).

22. The arrangement according to claim 17 orlδ, characterized in that the locking flap is pivotable about a substantially vertical axis (26) and of at least one, preferably two, above the outlet area (21) of the ramp surface (17) gate-like pivotable door flap (s) (27) is formed.

23. The arrangement according to claim 17 or 18, characterized in that the locking flap of at least one of the hanging line (40) of the draw-off section (14) or an extension frame (37) extending downward, at its upper end by an approximately horizontal, substantially pivotable pivot (35) is formed parallel to the discharge conveyor (15) pivot axis (36).

24. Arrangement according to one of claims 14 to 16, characterized in that the blocking device (24) consists essentially of a sectional door (51) running in lateral guide rails (53) with a plurality of articulated shut-off segments (52).

25. Arrangement according to one of claims 14 to 16, characterized in that the blocking device (24) consists essentially of a roller door (60) which can be rolled up on a horizontal shaft (62) arranged above the ramp surface and has a plurality of articulated shut-off segments (61).

26. Arrangement according to one of claims 14 to 16, 24 and 25, characterized in that the blocking device (24) has or is formed from at least one pendulum flap (57; 64; 66) which is mounted so as to oscillate about a horizontal axis.

27. The arrangement according to claim 26, characterized in that several pendulum flap elements (66) are articulated to one another to form a pendulum flap curtain (65) which forms the blocking device (24).

28. Arrangement according to one of claims 5 to 27, characterized in that the loading ramp (22) in the outlet area (21) in the direction of the discharge conveyor (15) conveying conveyor device (77) or forms.

29. The arrangement according to claim 28, characterized in that the conveyor (77) is a shaking trough (34).

30. The arrangement according to claim 28, characterized in that the conveyor (77) is an oscillating conveyor (82).

31. The arrangement according to claim 28, characterized in that the conveyor (88) has a sliding plate (83) or consists essentially of such.

32. Arrangement according to claim 31, characterized in that the sliding plate (83) on an inclined upper side (84) one in or under the pile on the discharge path side of the loading ramp (22) or its loading ramp frame (75) insertable wedge loader (85) is arranged.

33. Arrangement according to claim 32, characterized in that the wedge loader (85) by means of impression cylinders (80) in the direction of the draw-off section (14) can be advanced.

34. Arrangement according to claim 33, characterized in that the impression cylinder (80) on the base plate (78) of the loading ramp (22) or the loading ramp frame (75) are supported.

35. Arrangement according to claim 33, characterized in that the impression cylinder (80) on an between lying (L) and hanging (40) braced, spreading cylinder (87) having expansion frame (86) are supported.

36. Arrangement according to one of claims 31 to 35, characterized in that the sliding plate (83) can be driven by at least one clearing cylinder (89).

37. Arrangement according to claim 36, characterized in that the clearing cylinder (89) is arranged substantially parallel to the inclined upper side (84) of the wedge loader (85) below a fixed cover plate (88) and on the one hand at a fixed bearing (90) on the wedge loader (85) and on the other hand on a clearing bar (91) which can be displaced by means of the clearing cylinder over part of the upper side (84) of the wedge loader.

38. Arrangement according to claim 37, characterized in that the clearing bar (91) is arranged at the front end of a on the cover plate (88) and this sliding plate (92).

39. Arrangement according to one of claims 28 to 38, characterized in that the conveying device (77) is arranged at least partially below the ramp surface (17) on the loading ramp frame (75) and in its operating state on its front side facing the trigger (15) 93) protrudes from this.

40. Arrangement according to one of claims 28 to 39, characterized in that the conveyor (77) in a compact unit from the rear (94) of the loading ramp frame (75) to the front (93) in the direction of the discharge conveyor (15) can be pushed ,

41. Arrangement according to one of claims 28 to 40, characterized in that the conveying device (77) from the rear (94) of the loading ramp (22) below the loading ramp frame (75) through in the front outlet area of the loading frame (22) can be installed.

42. Arrangement according to one of claims 5 to 41, characterized in that the loading ramp (22) is associated with a shredding device (38) for extraction products (20).

43. Arrangement according to claim 42, characterized in that the comminution device (38) consists essentially of an in the outlet area (21) of the loading ramp (22) arranged crusher, especially impact roller crusher or jaw crusher.

44. Arrangement according to claim 42, characterized in that the shredding device (38) consists essentially of a chisel and / or hammer drill (39) arranged in the outlet area (21) of the loading ramp (22), above the ramp surface (17).

45. Arrangement according to claim 44, characterized in that the chisel and / or hammer drill (39) from the hanging wall (40) of the draw-off section (14) or a rail track (41) arranged thereon is arranged depending and in the longitudinal direction of the draw-off conveyor ( 15) can be moved at least over the width of the loading ramp (22).

46. Arrangement according to one of claims 5 to 45, characterized in that the loading ramp (22) is assigned a mesh screen (70).

47. Arrangement according to claim 46, characterized in that the grid screen (70) is arranged above the shaking channel (34).

48. Arrangement according to claim 46 or 47, characterized in that the screen (70) is coupled to the shaking channel (34).

49. Arrangement according to one of claims 25 to 27, characterized in that the grid screen (70) has at least one screen surface (71) variable in its inclination relative to the loading ramp (22).

50. Arrangement according to claim 49, characterized in that the grid screen (70) has two articulated screen parts (71, 72) which can be set up like a roof above the loading ramp (22).

51. Arrangement according to one of claims 5 to 50, characterized in that the discharge conveyor (15) is arranged below the outlet region (21) of the loading ramp (22).

52. Arrangement according to one of claims 5 to 51, characterized in that the loading ramp (22) is provided at the free end of its outlet area (21) with a side wall (43) of the discharge conveyor (15) overlapping loading flap (44).

53. Arrangement according to one of claims 5 to 52, characterized in that the discharge conveyor (15) is a chain scraper conveyor or a vibratory trough conveyor.

54. Loading ramp for extracting extraction products in underground extraction operations in quarry construction, in particular for use in the method according to one of claims 1 to 3 and in the arrangement according to one of claims 4 to 19, characterized by a loading ramp frame which has one of one at its top Feed point (19) to an outlet area (21) with a closing loading flap (44) has a sloping ramp surface (17), in the outlet area a blocking device (24) with at least one adjustable locking member (27; 30) is provided, by adjusting the Passage cross section (29) half of the ramp surface (17) to the loading flap (44) can be varied.

55. Loading ramp according to claim 54, characterized in that the inclination of the ramp surface (17) varies over its length, the ramp surface at a feed point (19) having a greater inclination than in the outlet area (21).

56. Loading ramp according to claim 55 or 56, characterized in that the ramp surface (17) or the baffle plate forming this (76) of the loading ramp (22) or its loading ramp frame (75) is adjustable in its inclination and / or its height.

57. Loading ramp according to claim 57, characterized in that the ramp surface (17) or the baffle plate forming this (76) on its rear side pointing towards the auxiliary section (94) is pivotable.

58. Loading ramp according to claim 56 or 57, characterized in that the ramp surface (17) or the baffle plate forming this (76) on its front side (93) pointing towards the trigger section (14) by means of a plug connection (97) at different heights Loading ramp frame (75) can be fixed.

59. Loading ramp according to one of claims 54 to 58, characterized in that the locking member is a locking flap (27; 30; 46).

60. loading ramp according to claim 59, characterized in that the locking flap is pivotable about a substantially horizontal axis (31).

61. Loading ramp according to claim 60, characterized in that the locking flap is formed by a section (30) of the ramp surface (17) in its outlet area (21).

62. Loading ramp according to claim 60, characterized in that the locking flap is essentially formed by a segment or sector closure (46) which separates a preferably curved, the feed point (19) of the ramp surface (17) from the outlet area (21) if necessary Storage wall (47) which can be pivoted in height about the horizontal axis (31) via at least one swivel arm (48).

63. Loading ramp according to claim 59, characterized in that the locking flap can be pivoted about a substantially vertical axis (26) and by at least one, preferably two, gate flap (s) which can be pivoted like a gate above the outlet region (21) of the ramp surface (17) ( 27) is formed.

64. Loading ramp according to one of claims 54 to 63, characterized in that it has or forms a conveying device (77) in the outlet area (21) in the direction of the discharge conveyor (15).

65. Loading ramp according to claim 64, characterized in that the conveyor (77) is a shaking channel (34).

66. Loading ramp according to claim 64, characterized in that the conveyor (77) is a vibratory conveyor (82).

67. Loading ramp according to claim 64, characterized in that the conveyor (77) has a sliding plate (83) or consists essentially of one.

68. Loading ramp according to one of claims 54 to 67, characterized in that the loading ramp (22) is assigned a mesh screen (70).

69. Loading ramp according to claim 68, characterized in that the mesh screen (70) is arranged above the shaking channel (34).

70. Loading ramp according to claim 68 or 69, characterized in that the mesh screen (70) is coupled to the shaking channel (34).

71. Loading ramp according to one of claims 68 to 70, characterized in that the grid screen (70) has at least one screen surface (71) which is variable in its inclination relative to the loading ramp (22).

72. Loading ramp according to claim 71, characterized in that the mesh screen (70) has two screen surface parts (71, 72) which are connected to one another in an articulated manner and can be set up like a roof above the loading ramp (22).

73. Loading ramp according to one of claims 54 to 72, characterized in that the inclination of its ramp surface (17) can be changed at least in the outlet area (21).