EP2286064B1 - Chain guide for a driving chain of a mining machine - Google Patents

Abstract

A chain guide for a driving chain of a winning plow or the like, the chain guide being provided with a chain guide element which is arranged in spatial proximity to the sprockets at a driving or return station and is against the chain transversely to the direction of movement of the latter, provision is made according to the invention for the chain guide element to have at least one pressure roller which can be adjusted against the chain links of the driving chain, as a result of which the wear on the chain guide element is considerably reduced.

Description

The invention relates to a chain guide for a drive chain of a mining machine, in particular for a plow chain for moving an extraction planing, provided with end portions of the mining machine or can be arranged drive and / or deflection stations with drive or Umlenkkettenrädern for the drive chain and at least one in close proximity to The sprockets arranged on the drive and / or deflection, transversely to the direction of movement of the chain against the load and / or Lostrum engageable or employed in the operational use chain guide element according to the preamble of claim 1.

There is known a chain guide assembly on a mining machine ( DE 20 2004 000 924 U ) in which a chain guide element is formed by a pressure surface having down device, which is insertable into a receiving pocket in the chain guide, that he placed with a one-sided open bolt receptacle on a arranged in the receiving pocket hinge pin and then down to this in the Pocket is pivoted into it until its lower pressure surface presses against the drive chain and he can be locked in this position with a locking arrangement. The replacement of the hold-down with the pressure surface arranged thereon and replacement with a new, appropriately designed chain guide element is possible in a short time, so that downtime can be minimized in case of wear of the pressure surface of the blank holder. Nevertheless, the known chain guide elements, on which the drive chain is moved with not inconsiderable pressure force and speed, subject to high wear, so that their replacement within relatively short time intervals is required to ensure the proper operation of the mining machine.

A chain guide according to the preamble of claim 1 is known from DE 30 17 353 A1 known. The rollers of the chain guide element are mounted in banking longitudinal grooves on bearing blocks, which for this purpose each have a abboustoßseitigen and an offset side leg. The roller blocks are arranged in a front side of the guide rail upstream housing having side walls and a cover plate. In the housing, the bearing blocks are fastened by means of screws, which pass through the side walls and the bearing blocks. A centering of the bearing blocks by means of centering pin.

From the DE 195 37 414 A1 is a planer drive with Druckrollenabstreifer known in which the pressure rollers between the two chain strands are positioned. The pressure rollers are therefore positioned at a short distance to the sprocket and serve to solve the respective chain link of the chain early out of the composite with the sprocket teeth of the drive sprocket.

The object of the invention is to avoid the aforementioned disadvantages and to provide a chain guide of the type mentioned, which allows low wear in the range of the chain guide element and a quick assembly and disassembly of the chain guide element.

This object is achieved with the invention specified in claim 1. The chain guide element has at least one against the chain links of the drive chain employed or engageable pressure roller.

By using a pressure roller on the chain guide element, a sliding contact between it and the drive chain is at least largely prevented because the pressure roller rotates at the same peripheral speed as the
Passing speed of the chain, against which it presses to its leadership. Even if coal dust or other, possibly also abrasive material passes between the chain and the pressure roller, the resulting wear of the pressure roller roller track, which may be adjusted in a preferred embodiment of the invention to the defined by the chain links envelope surface, only small, so an exchange of im Substantially required by the pressure roller chain guide element is required only after a significantly longer period of use, as was the case with the chain guide elements used previously.

The pressure roller is preferably rotatably mounted on a roller axle and interchangeable with this. The roller axle is so then removed in unit with the rotatably mounted pressure roller and exchanged for a corresponding new part, so that the downtime of the mining machine are limited to a minimum. The pressure roller can be arranged and / or stored particularly advantageously at an attachment which is replaceably insertable or inserted in the inlet region of the drive and / or deflection station. In this structurally particularly advantageous embodiment, therefore, the pressure roller is arranged on a replaceable insertable in a receiving pocket attachment, which may then contain other components of the chain guide, such as a known pawl for the chain, which when replacing the drive or Umlenkkettenräder the drive or deflection stations is used to keep the chain stretched during such maintenance.

According to an advantageous embodiment, the roller axis of the pressure roller may be supported on one or more bearing blocks, which are preferably mounted replaceably in a receiving pocket. In this case, preferably both sides of the roller, a lower bearing block and an upper bearing block can be provided. Further preferably, in this embodiment, the bearing blocks can be secured by a preferably hinged lid in the receiving pocket against loosening. Alternatively, the bearing blocks can be secured by means of at least one sliding latch in the receiving pocket against loosening. In this embodiment, it is particularly advantageous if an upper bearing block is provided with sliding guides for sliding bolt. The sliding guides may in particular consist of hook-like strips which vertically fix one or preferably two slide bars which can be displaced relative to one another and at the same time guide them horizontally. Further preferably, it can be mounted above the receiving pocket holding blocks with mutually facing latch pockets, and / or the sliding latch have locking lugs which border in the latch state in the latch pockets to secure the upper bracket in the locked state of the sliding latch against loosening.

In the particularly preferred embodiment with positive locking device for the bearing blocks, a pair of sliding bars is provided, each sliding latch has a U-shaped base with 3 legs, of which an edge leg and an intermediate leg at opposite outer sides is provided with guide strips for positive insertion in sliding guides, and of which the second Edge leg has a penetration hole for a locking screw. A lower axle receptacle for the roller axle can be arranged directly at the bottom of the recess and preferably be formed or fastened fixedly to the attachment piece.

In particular, when it comes to lead particularly long and / or heavy chains with a chain guide element according to the invention and to keep under tension, a construction may be advantageous, having a plurality of successively arranged in the direction of passage of the chain, employed against the chain pressure rollers, whereby the required high pressure force distributed over several roles and the surface pressures between chain and running surface of the pressure rollers can be kept low or reduced. The pressure roller can be employed under the action of at least one spring element and / or a shock absorber against the chain, whereby a deflection of the chain in a direction transverse to its passage direction, for example, jerky loads is made possible without, however, the pressure roller of the chain only temporarily withdraws and thereby, if only for a short time, can no longer fulfill its leadership function.

Further features and advantages of the invention will become apparent from the following description and the drawing, wherein preferred embodiments of the invention are explained in more detail by means of schematic examples. It shows:

Fig. 1 a chain guide for a drive chain of a coal planer in longitudinal section;

Fig. 2 a chain guide after Fig. 1 in a perspective view obliquely from above, partly in section;

Fig. 3 following the chain guide Fig. 1 and 2 used in use pressure roller in section;

Fig. 4 one at the chain guide Fig. 1 and 2 usable attachment piece with a pressure roller accommodated therein in a perspective view according to a first embodiment variant;

Fig. 5 one at the chain guide Fig. 1 and 2 usable attachment piece with pressure roll received therein in a perspective exploded view according to a second embodiment variant;

Fig. 6 a longitudinal section through the attachment piece according to Fig. 5 in the assembled state of the pressure roller; and

Fig. 7 in perspective, a detailed view of the slide bolt pair.

The in the Fig. 1 and 2 shown arrangement shows a scraper chain conveyor at one of its end portions, which is provided in a conventional manner with a planing guide for a coal extraction planer. The planer (not shown) is driven by means of a drive chain 11, which is received in a lying below the conveying plane chain case 10.

For this purpose, the arrangement has a first chain channel 13 for the load strand 14 of the drive chain and a second chain channel 15 through which the slack side 16 of the drive chain runs. At the end regions of the chain channels 13, 15 is a drive station 17 with a drive sprocket 18, which is wrapped by the drive chain 11 and with which the chain is pulled through the chain channels in a known manner. In the transition region 19 between the second chain channel 15 and the drive station 17, a chain guide 20 is arranged with a the lower strand of the chain pushing down and thereby from the chain channel for the return strand to drive sprocket 18 deflecting chain guide element 21 having a pressure roller 22 and in Essentially consists of one which presses with its track 23 from above against the drive chain 11 and the chain thereby deflects the drive gear back and keeps under tension.

The chain guide 20, which consists of a mounted in a gap 24 above the chain channel 15 at the transition region 19 of the mining machine replaceable attachment 25 is in the Figures 3 and 4 in a first embodiment shown in more detail. It can be seen that the attachment piece 25 consists of a housing with two side walls 26 and a rear end wall 27, wherein the two side walls 26 are provided with upwardly open recesses as receiving pockets 40 for bearing blocks 28, 28 A, a roller shaft 29 for the pressure roller 22nd rotatably record. The receiving pocket 40 is bounded at the rear by the end wall 27 and downwardly and frontally by the respective side wall 26. Both bearing blocks 28, 28A are formed congruent to the peripheral wall of the receiving pocket 40 and positively received in this. The lower bracket 28 may optionally be anchored firmly in the receiving pocket and this example be welded. The upper bearing block 28A, after the nuts 41 have been released from the two vertically standing and anchored in the lower bracket 28 or in the side wall 26 threaded rods 42, are removed upwards, whereby the roller shaft 29 is exposed and then together with the pressure roller 22 from taken from the lower bracket 28 and can be replaced by another pressure roller 22 together with roller axis 29.

The pressure roller 22 is rotatably mounted on the roller shaft 29 with two tapered roller bearings 30 in O arrangement and provided against the entry of coal dust or other contaminants with lateral sealing lids 31. One recognizes in particular in Fig. 3 in that the raceway 23 of the pressure roller 22 has a concave shape which is adapted to the envelope surface 34 defined by the chain links 33, so that the pressure roller, acting on the chain, not only holds and deflects it under tension, but at the same time also sideways Chain stops.

In operation, the recorded in the attachment piece 25 and in the receiving pocket 24 pressure roller 22 is covered at the top of a hinged lid 35, which largely prevents access of coal dust or rocks to the role, but after its opening provides easy access to the pressure roller 22 and It makes it possible, with simple means to remove dust and other impurities, which nevertheless have settled in the area of the pressure roller and / or in the receiving pocket in the attachment piece. If it should turn out in such an inspection that the operation of the roller is no longer reliably ensured by wear, this can be quickly and easily replaced by the unilaterally mounted on the hinge axis 45 lid 35 is pivoted open and then, as described above, the Bearing 28, 28A open and the pressure roller 22 is lifted together with its roller axis 29 and replaced with a new role with roller axis. When both the lower bracket 28 and the upper bracket 28A are loose, i. can still be removed from above sitting in the receiving pocket 40, the lid 35 can also form the securing element which presses the bearing blocks 28, 28A down into the receiving pocket 40 secures against loosening. But the lid 35 can also hold only the upper bracket 28A in the closed position.

The Figures 5 and 6 show an alternative embodiment of a chain guide 120 according to the invention, which in turn essentially consists of an attachment piece 125, which can be attached via the here rear, designed as a bearing plate with strip-shaped edges side wall 126 formed on a trained for receiving the bearing plate bracket a drive station a planing. In the illustrated embodiment of the attachment piece 125 is the front, only in Fig. 6 shown side wall 126 via a tilting hinge 160 on a spar or a Seitenbracke the drive station attachable, whereby, provided that the retaining hooks for the rear side wall 126 are dissolved, the entire attachment piece 125 can be pivoted to perform, for example, repair work on a parallel to the planing installation chain scraper conveyor to be able to. As in the previous embodiment, a pawl 161 is articulated pivotally between the two side walls 126 and the attachment piece 125 so as to be able to fix the chain strand of the plow chain for repair cases with the cover cover 162 removed or swung up. In the left half of the attachment piece 125 in turn a receiving pocket 140 is formed, in which a rotatably mounted on a bearing shaft 129, the actual chain guide element 121 forming pressure roller 122 can be exchangeably fixed, wherein the pressure roller 122 against a in the Fig. 5 and 6 Plow chain, not shown, adjustable or with their career, as already described above, can be pressed. The plow chain passes in the operating state, a channel opening 151 in the front end wall 127 here and a channel opening 152 in the rear end wall 127A here. To the front channel opening 151 connects in the assembled state of the attachment piece 125 at the drive station, the upper chain guide channel for the plow chain, while the plow chain runs behind the rear channel opening 152 in the drive or reversing wheel for the plow chain. With the pressure roller 122, the plow chain between two channel openings 151, 152 can be biased downward, whereby an optimal and low-wear inlet of the upper chain strand of the plow chain in the planing sprocket (not shown) is achieved without the plow chain in contact, for example, with the edges the rear channel opening 152 comes. As in the previous embodiment, here also pressure roller 122 and roller shaft 129 are designed as a unit, which is why the entire pressure roller 122 can be easily and quickly replaced with another pressure roller, if wear on the envelope of the pressure roller 122 or its storage has occurred.

In order to facilitate the simplest possible replacement of the pressure roller 122 together with the roller axis 129 and at the same time to achieve a stable and secure locking of the roller shaft 129 even at disproportionately high vertical forces on the pressure roller 122, the roller shaft 129 with its two projecting laterally beyond the pressure roller 122 axle stubs 129A in axle mounts 155 inserted in a rotationally fixed manner, the lower axle receptacle 155 being formed directly on a wall section 126A of the here front side wall 126 and the rear lower axle receptacle on a rear wall section in the rear side wall 126. In this case, the axle receptacle 155 can either consist of a correspondingly formed recess in the wall section 126A or, as in FIG Fig. 5 shown to be formed within a ring segment 156, which is welded to the wall portion 126A and could also be replaced in the event of a failure when the axle receptacle 155 has been knocked out. Achsaufnahme 155 together with ring segment 156 form the attachment piece 125 of the chain guide 120 thus a lower bearing block, which is fixed and integrally formed on the attachment piece 125, while only an upper, generally designated by reference numeral 128 bearing block is removable. The upper bearing block 128 at the same time forms the cover for the pressure roller 122 and the bearing block 128 has two side bars 171 with here rectangular cross-section, which can be inserted into the correspondingly congruent receiving pockets 140 in the wall sections 126A in a precisely fitting and form-fitting manner. Both side bars 171 are on their bottom edge provided with further ring segments 176, which form like the lower ring segments 156 on the wall portions 126A each one half of the axle, here thus the upper half of the axle 155 and in the assembled state the stub axle 129A, in the illustrated embodiment, a non-round, preferably approximately oval cross-section, rotationally fixed between two ring segments 156,176 record.

The trained as a lid bearing block 128 is provided with a the two side webs 171 connecting cover web 172, above which two lateral, approximately L-shaped hook strips 173 are welded, which form with their undercut sections sliding guides for two identical to each other sliding bolt 190, with which the Lock position of the upper bearing block 128 can be secured to prevent inadvertent release of the bearing block 128 and thus also the displacement of the roller shaft 129 of the pressure roller 122.

It will now be referred to the first Fig. 7 in which the two identical sliding bolt 190, which are used as a pair of sliding bolt 190, are shown. Each sliding bolt 190 has a substantially U-shaped base body 191 with a short edge leg 192, a longer edge leg 193 and an intermediate leg 194 which is perpendicular to both edge legs 192, 193. Both the intermediate leg 194 and the end face of the longer edge leg 193 are each provided at the edge with a step, whereby guide rails 195 are formed on the edge legs 193 and 196 on the intermediate leg 194, with which the sliding bolt 190 each form fit to the strips forming the sliding guide (173, Fig. 5 ) vertically immovable and horizontally movably guided. The respective shorter edge leg 192 is dimensioned such that in the assembled state, the guide bar 196 on the intermediate leg 194 and the much shorter guide bar 195 on the end face of the edge leg 193 are plane-parallel to each other. As a result of the U-shaped configuration, the respective shorter edge limb 192 dips into the intermediate space 197 between the two edge limbs 192, 193, and the distance between the two longer edge limbs 193 can be reduced by pushing apart the two shorter edge limbs 192. Only in this position, not shown in the figures, can the upper bearing block (128, Fig. 5 ) are mounted or disassembled in the receiving pocket to facilitate the displacement for the roller axis (129, Fig. 5 ) to open or close. To lock the bearing block by positive locking the longer edge legs 193 are provided on the outside with locking lugs 198, the tops of which taper in a wedge shape to the free ends and the locking of the bearing block 128, such as Fig. 6 border in latch pockets 165 which are formed on holding blocks 166, which in turn on the upper deck surfaces of the both end walls 127, 127A are mounted with mutually facing latch pockets 165.

In order to prevent even with vibration loosening of the sliding bolt 190 from each other and from the locking position and at the same time to apply the highest possible clamping force, each of the shorter edge leg 192 is provided with a through-hole 199, which is penetrated by a clamping screw 180. About the clamping screw 180, the distance between the two shorter edge legs 192 can be reduced, whereby the distance between the two outer, longer edge leg 193 increases and the locking lugs 198 correspondingly deeper into the latch pockets 165.

The invention is not limited to the illustrated and described embodiments. Thus, it is possible, for example, to provide a plurality of pressure rollers in the direction of passage of the chain arranged one behind the other in order to provide the chain over a longer distance a guide that works largely wear-free. It is also possible to make the pressure roller under the action of a spring element and / or a shock absorber against the chain, which always ensures a reliable contact between the roller and chain even with shock loads of the drive chain. The chain guide according to the invention may alternatively or additionally attack on the load strand of the drive chain and of course it is not only suitable for a plow chain, but for example also for drive chains of chain scraper conveyors. The bearing blocks can also be used in receiving pockets, which are formed directly on the side walls of the drive or reversing stations.

Claims (12)

1. Chain guide for a driving chain of a mining machine, in par-ticular for a plow chain on a winning plow, comprising driving and/or return stations arrangable on end regions of the mining machine and having driving or return sprockets for the driving chain (11), and comprising at least one chain guide element (21; 121) which is arranged in spatial proximity to the sprockets (18) at the driving and/or return station and adjustable transversely to the direction of movement of the chain against its load strand and/or return strand, which chain guide element (21; 121) has at least one pressure roller (22; 122) which is adjustable against the chain links (33) of the driving chain (11) and which is rotatably mounted on a roller axle (29; 129) and is exchangable together with the latter, whereas the roller axle (29; 129) of the pressure roller (22; 122) is supported on bearing blocks (28, 28A; 128) which are fitted in an accommodating pocket (40; 140), characterized in that the bearing blocks (128) are secured against release in the ac-commodating pocket (140) by means of at least one sliding bolt (190).
2. Chain guide as claimed in claim 1, characterized in that the pressure roller (22; 122) has a track (23) adapted to the envelope surface (34) defined by the chain links (33).
3. The chain guide as claimed in one of claims 1 or 2, characterized in that the pressure roller (22; 122) is arranged on an attachment (25; 125) which is interchangeably insertable or is interchangeably inserted in the entry region (19) of the driving and/or return station (17).
4. The chain guide as claimed in one of claims 1 to 3, characterized in that the bearing blocks (28, 28A; 128) are fitted interchangeably in the accommodating pocket (40; 140).
5. The chain guide as claimed in one of claims 1 to 4, characterized in that the bearing blocks (28, 28A) are secured against release in the accommodating pocket (40) by means of a preferably hinged lid (35).
6. The chain guide as claimed in one of claims 1 to 5, characterized in that a top bearing block (128) is provided with sliding guides (173) for sliding bolts (190) .
7. The chain guide as claimed in one of claims 1 to 6, characterized in that retaining blocks (166) having locking pockets (165) which face one another are fitted above the accommodating pocket (140), and in that the sliding bolts (190) have locking lugs (198) which engage in the locking pockets (165) in the locking state in order to secure the top bearing block (128) against release in the accommodating pocket (140).
8. The chain guide as claimed in one of claims 1 to 7, characterized by a pair of sliding bolts (190), wherein each sliding bolt (190) has a U-shaped basic body (191) having three legs, of which one marginal leg (193) and one intermediate leg (194) are provided, on outer sides facing away from one another, with guide strips (195, 196) for form-fitting engagement in sliding guides (173), and of which the second marginal leg (192) has a through-hole (199) for a securing screw.
9. The chain guide as claimed in one of claims 1 to 8, characterized in that a bottom axle receptacle (155) for the roller axle (129) is arranged at the bottom of the accommodating pocket (140) and is preferably fixedly formed on or fastened to the attachment (125).
10. The chain guide as claimed in one of claims 1 to 9, characterized by a plurality of pressure rollers which are arranged one behind the other in the passage direction of the chain and are adjustable or are adjusted against the chain (11).
11. The chain guide as claimed in one of claims 1 to 10, characterized in that the pressure roller (22) is adjustet against the chain under the effect of at least one spring element.
12. The chain guide as claimed in one of claims 1 to 11, characterized in that the pressure roller is adjusted against the chain under the effect of at least one shock absorber.

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