GB2170772A

GB2170772A - Angular mining conveyor

Info

Publication number: GB2170772A
Application number: GB08602868A
Authority: GB
Inventors: Zdzislaw Sender; Alojzy Mura; Leonard Liduchowski; Pawel Zok; Wojciech Skolik; Stanislaw Szyngiel; Henryk Rojek; Bogdan Gajda; Miroslaw Major; Piotr Stanislawski; Henryk Sliwiok; Jan Sikora
Original assignee: STASZIC KATOWICKIE GWARECTWO W
Current assignee: STASZIC KATOWICKIE GWARECTWO W
Priority date: 1985-02-12
Filing date: 1986-02-05
Publication date: 1986-08-13
Also published as: DE3604366A1; GB2170772B; GB8602868D0

Abstract

A mining conveyor having a scraper chain conveyor for withdrawal of the excavated material includes a corner member. Within the range of the corner member (1) the chain (2) is guided in a forced way by the horizontal supporting of the vertical links (5) of the chain (2) along the desired path of the curved conveyor flight. The path of movement of the chain (2) is so adapted that within the entire range of the corner member (1) the required play between the end face of scrapers (9) and the outer radius of curvature of the side wall of the corner trough (11) is maintained. Vertical links (5) of the chain (2) within the range of curvature of the conveyor flight, are supported on the rims (4) of guiding wheels (3) mounted rotatably, the rims (4) of guide wheels (3) being shaped as sprocket wheel rims. In an alternative embodiment the chain (2) is guided in the corner unit on a series of closely spaced rollers. <IMAGE>

Description

SPECIFICATION Angular mining conveyor This invention relates to an angular mining conveyor with a pulling chain lying in the axis of the conveyor flight suited to haulage in the arched conveyor corners.

The angular mining conveyors so far known, such as e.g. those made acc. to FRG Patent Specifications Nos. 2 051 384 and 2 065 424 have been so designed that within the corner, where the path of the conveyor has been curved most often at an angle of 90 degrees, the scrapers of the drag conveyor run in the appropriately shaped rims of the guide wheels placed horizontally one above another. The above mentioned wheels are freely supported in a bearing frame of the conveyor flight corner in such a way that their vertical axis of rotation passes through the point of application of the radius of curvature of the corner.

Also known is a conveyor such as that acc. to the Patent Specification No. 120 749 provided with additional reloading device situated immediately before the corner member of the conveyor flight.

This re-loading device is provided with a separate independent drive and a tensioning mechanism.

This design has been aimed at a diminishing effectively the resistance of the scrapers of the corner member to motion, said resistance being directly proportional to the tensioning forces of the drag chain.

The angular conveyors so far known have the following drawbacks: intermediate guiding of the pulling chain by mounting of the inner scraper ends in the grooves of the guide wheel rims requires a considerable diminishing of the scraper spacing so as to ensure a simultaneous cooperation of at least four scrapers with a guide wheel rim. The purpose in so doing has been to ensure a maximum reduction of the loading of the scraper end and to maintain as uniform a motion of the pulling chain as possible. A diminished scraper spacing, as well as an increased amount of the number of the scrapers in the conveyor causes in effect increased deadloads and thus leads to an increased driving power demand and to an increased cost of the conveyor. Also unavoidable is non-uniform chain run which exerts a negative influence on the fatigue strength of the chain.The design with an additional reloading device is a sophisticated one the manufacturing, installing and operating costs being too high.

The aim of this invention has been an improvement of the design of the angular conveyor which would be devoid of the drawbacks given above.

This aim has been achieved by the use of a design being the subject of this invention. It consists in such a construction of the angular conveyor as to obtain a forced guiding of the drag chain within the reach of the corner member by the horizontal supporting of the vertical chain links along the given curved path of the conveyor flight. The link supporting line has been so chosen as to ensure the required play between the scraper ends and the side wall of the corner trough.

A forced guiding of the chain has been ensured due to the use of the known guiding wheels with the rims shaped in the same way as those of the sprocket wheels. These wheel have been mounted in a known way on a vertical pin mounted in the axis of application of the radius of curvature of the conveyor flight. In order to enable the drag chain to be appropriately supported, it is fastened to the scraper by mounting the individual chain sections in an articulated way to a yoke suspended on a pin mounted in the scraper body, said yoke arms being situated in the appropriately shaped seats in the bottom part of the scraper. In this way the chain can be appropriately lowered with respect to the working part of the scraper.The pulling chain so produced is accommodated in the recesses of the troughs situated along the whole conveyor flight opened on the side of the scrapers, said recesses in the standard members of the conveyor flight lying close one to another and being separated by a common side wall, whereas inside the system and close to the corner member said recesses are situated either as in the conveyor flight in a longwall, or one above another. In the latter case said recesses are opened also on the inner side of the curvature of the corner member. This enables the chain to freely co-act with the guide wheel.

The forced guiding of the conveyor chain at the corner may also be effected in still another way, and namely by constructing of such a corner member which would have on the inner side of the curvature densily spaced rollers freely supported on pins rigidly mounted in the horizontal walls of the corner member. The roller rims are suited to cooperation with scraper chain. Both extreme rollers have been so situated that their axes lie in the planes limiting the arched part of the corner member, the remaining rollers being so spaced that the maximum distance between the roller rim edges does not exceed two diameters of scraper chain link arms in the plane in which the rollers lie. Such a design of an angular conveyor also requires an appropriate construction of the joint suited to the assembly of scrapers without the necessary cutting of the chain into the individual sections.It consists in that the chain is connected to the scraper by clamping of the bottom horizontal chain link between the scraper offset protruding downwards and the internal face of the shaped head of the coupling bolt mounted in the scraper. Both the scraper set-off, as well as the bolt head have been suited as far as the dimensions and the shape are concerned to clamping of the horizontal link with ensuring simultaneously a free motion to the vertical link, adjacent to the former. Still another solution to this problem consists in such a construction of the scraper in which the vertical plane of symmetry of mounting of the chain lies ahead of the vertical plane passing through the bottoms of the side recesses of the working faces of the scraper when viewed upon from the side of the motion of conveyor.The advance of the bottoms of the working faces passing through the point of application of the chain ranges within the limits from 0.5 up to 1.0 of the distance between the chain axis and the bottom surface of the scraper depending upon the anticipated degree of loading of the working parts of the scraper. Such an advanced location of the point of application of the chain enables the forces which raise the scraper by revolving it around its lontitudinal axis to be effectively counteracted.

The design of the angular mining conveyor acc.

to the design presented above has the fllowing advantages: it ensures a uniform travel of the pulling chain, reduces considerably the resistance to motion within the range of the corner member of the conveyor flight, as well as ensures considerable economic advantages due to an increased scraper spacing and the resulting reduced drive power demand.

The subject of the invention has been shown on an example of embodiment in theaccompanying drawing, wherein Figure 1 presents a fragment of the conveyor including the corner member when viewed upon from above, Figure 2 shows the corner member in a cross section along line A-A shown in Figure 1, Figure 3 visualizes the standard member of the conveyor flight in a cross section along line B-B shown in Figure 1, Figure 4 illustrates still another design of a corner member when viewed upon from above, Figure 5 presents the same corner member in a cross section along line C-C shown in Figure 4, Figure 6 visualizes the joint of a scraper with the chain viewed upon from above, Figure 7 shows the joint in a section along line D-D shown in Figure 6, Figure 8 presents the same joint but this time in a section along line E-E shown in Figure 6, Figure 9 illustrates the scraper together with a fragment of the chain viewed upon from the bottom and, finally, Figure 10 presents the same scraper as above, but this time viewed upon from the front. As may be seen in Figures 1 to 3 the angular conveyor acc. to this invention has been provided with a known corner member 1 inside which the drag chain 2 wraps the guide wheels 3 and changes direction of its path acc. to the curvature of the conveyor flight of radius R. On the rims 4 of the guide wheels 3 there are supported vertical links 5 of the chain 2.The guide wheel 3 mounted freely and rotatably on pin 6 whose axis 7 passes through the point of application of the radius R have been so chosen as to maintain the required play between the vertical surface 8 of the scraper 9 and the outer radius of curvature of the side wall 10 of the corner trough 11 within the whole range of the corner member.

The rims 4 of the guide wheels 3 have been shaped identically as the rims of the sprocket wheels. The drag chain 2 has been connected to the scraper 9 through the articulated joint of the individual sections of the chain 2 to the yoke 12 suspended on a pin 13 mounted in the scraper body 9, the arms 14 of said yoke 12 being located in the shaped seats 15 of the bottom part 16 of the scraper 9, and the pin 13 being protected against being slipped off in a known way.

The pulling chain member 2 along the whole conveyor flight are accommodated in recesses 17 of the troughs, said recesses being open on the side of the scrapers 9. In standard troughs 18 of the conveyor flight the recesses 17 are situated close to one another and are separated by a common side wall 19, whereas inside the system and in the neighbourhood of the corner trough 11 the recesses 17 are situated one above another and, because of the desired cooperation with the guide wheels 3, said recesses 17 are also open on the inner side of the curvature of the corner member 1 of the angular conveyor.

In Figures 4 and 5 there has been shown a corner member provided on the inner side with den- sily arranged rollers 20 freely supported on vertical pins 21 rigidly mounted in the horizontal walls of the corner member 1, said rims 22 of the rollers 20 being suited to cooperation with the drag chain 2.

The extreme rollers 23 and 24 have been so arranged that their axes 25 and 26 lie in the planes 27 and 28 limiting the arched part of the corner member. The remaining rollers 20 have been so arranged that the maximum distance S between the edges of their rims 22 in the plane 29 in which they lie does not exceed two diameters d of the arms 30 of the links of the drag chain 2.

The joint shown in Figures 6 to 8 has been so designed that the chain 2 is mounted to the scraper 9 by clamping of the horizontal link 31 of the chain 2 between the offset 32 of the scraper protruding downwards and the inner face 33 of the shaped head 34 of the coupling bolt 35 mounted in the scraper 9.

The middle part 36 of the scraper shown in Figures 9 and 10 has been so designed that the vertical plane 37 of symmetry of mounting of the chain 2 to the scraper lies ahead of the vertical plane 38 passing through the bottoms 39 and 40 of the working recesses of the faces 41 and 42 of the scraper in the direction of the motion of conveyor.

This advance S ranges within the limits from 0.5 up to 1.0 of the distance L of the axis 43 of the chain 2 from the bottom surface 44 of the scraper.

The angular drag conveyor acc. to this invention may be used for haulage of the excavated materials/winnings/in the longwall mining excavations, particularly in the longwalls without the advanced recesses for mechanical coal miners.

Claims

1. Angular mining conveyor having a drag chain lying in the axis of its conveyor flights and provided with a corner member characterised in that, within the range of the corner member, the drag chain is located to run along in a forced way by supporting of the vertical links of the chain along the required path of curvature of the conveyor flight, the supported path of movement of the links being such as to ensure the required play between the vertical end face of the scrapers of the conveyor and the outer radius of curvature of the side wall of a cooperating corner trough of the conveyor, within the whole range of the said corner member.

2. A conveyor as claimed in Claim 1, wherein the vertical links of the chain within the range of the curved portion of the path of the conveyor flight, are supported on the rims of known guide wheels rotatably mounted on a pin, said rims of said guide wheels being shaped similarly to that of a sprocket wheel.

3. A conveyor as claimed in Claim 1 wherein the drag chain is connected to the scraper in an articulated way by mounting the individual segments of the chain to a yoke suspended on a pin mounted in the scraper body, the arms of said yoke being situated in a shaped seat in the bottom part of the scraper.

4. A conveyor as claimed in Claim 1 wherein the pulling chain along the whole conveyor flight, is accommodated inside the recesses of the troughs opened on the side of the scrapers, in the standard troughs along the conveyor flight, these recesses being close to one another and are sepa rated by a common side wall, whereas inside the system, as well as in the neighbourhood of the corner member they are situated one above another and are in this case opened also on the inner side of the curvature of the conveyor flight.

5. A conveyor as claimed in Claim 1 wherein the corner member of the conveyor flight is provided on the inner side of the conveyor with densely arranged rollers freely supported on vertical pins rigidly mounted in the horizontal walls of the corner member, the rims of the rollers being adapted for cooperation with the drag chain.

6. A conveyor as claimed in Claim 5 wherein both the extreme rollers are so arranged that their axes lie in the planes limiting the arched portion of the said corner member; the maximum distance between the edges of the rims of the neighbouring rollers in the plane where they are situated does not exceed two times the diameter of the arms of the links of the drag chain.

7. A conveyor as claimed in Claim 1, wherein a chain is associated with the scraper by clamping of the horizontal link of the chain between an offset portion of the scraper protruding downwards and the inner face of a shaped head of a coupling bolt mounted in the scraper.

8. A conveyor as claimed in Claim 1 wherein the vertical plane of symmetry of mounting of the chain lies ahead of the vertical plane passing through the bottoms of the working recesses of the faces of the scraper in the direction of motion of the conveyor, the spacing of such planes ranging within the limits from 0.8 up to 1.0 of the distance of the axis of the chain from the bottom surface of the scraper.

9. An angular mining conveyor substantially as hereinbefore described with reference to, and as illustrated in, Figures 1 - 3 or Figures 4 and 5 or either Figures 1 - 3 or Figures 4 and 5, when modified as shown in Figures 6 - 8 or Figures 9 and 10 of the accompanying drawings.