Section of tear-off planer guide

FIELD: mining.

SUBSTANCE: proposed section of tear-off planer comprises guide element arranged on the side of mined-out space from haulage chute and return travel conveyor chute, upper channel for haulage chain and lower channel for haulage chain, and guide slot, open towards breakage face, for engagement of under-conveyor plate of tear-off planer. Note here that said guide element can carry at least one cover element to stop inspection hole for both haulage chain channels that comprises connecting cantilever for hydraulic cylinder to control conveyor unit inclination and receiving bins for heads of boltless joint between conveyor chutes in rigid joints of adjacent sections of tear-off planer guides. Guide element consists of casting incorporating receiving pans, and/or return travel conveyor chute sections on the side of mined-out space, and/or guide for under-conveyor plate of tear-off planer.

EFFECT: longer life, efficient use.

15 cl, 6 dwg

 

The invention concerns a section of the guide tear-off plane for posting the tear-plough pull on the chain guide element located on the side of the goaf from a limited lateral profiles of the transport chute and limited profiles gutters reverse conveyor having an upper channel for traction chain and the bottom channel to the conveyor chain equipped open to Oistamo the bottom guide groove for engagement podkovernoi plate detachable plow, and the guiding element can Rethimno to gain a foothold, at least one covering element for locking the inspection holes for both channels for traction chain, located on the guide element connecting the console to the hydraulic control cross the inclination of the conveyor plow and with pockets for receiving the heads of the terminals screwless connection of the pans of the conveyor for hard tensile connect adjacent sections of the guide tear-off of a plane.

In the guide device detachable plow can be extremely tear-planes with exciting below the transport chute mining device podkovernoi stove, since the branches of the plow chain held in passing from goaf transport chute channels for the Yahweh chain. Tear-planes are used, in particular, in the development of mountain formations with minor capacity from less than 600 mm to about 1500 mm

A guiding device detachable plow with sections of the guide tear-off plane of the respective species is known from the document DE 4233840 A1 and consists of a welded construction with welded with each other components, which by means of the fastening screws Rethimno fixed, at least the guards. Both chain channel are separated from each other by welded on a flat, vertically rising side platform trough conveyor distancerange Shoe, the upper and lower side of which is made flat. Guards form the lower continuations of the sides of the bottom of the lower channel to the conveyor chain in which a roller is Podkopayeva plate detachable plow and joins pulling branches of the plow chain. Like, is made as a welded construction, tear-guiding device of a plane is known from the document DE 3710925 A1.

The mounting rails detachable plow requires time-consuming due to the many placed welds and sensitive to errors in the location of individual parts to each other and therefore can be decreased resistance and, accordingly) is on the service life of the guide sections detachable plow considered first type.

Object of the invention is to create partitions guide tear-off plane for directing device detachable plow, which can be economical in manufacture and in operation have a high service life and low susceptibility to wear and tear.

These and further problems are solved according to the invention by the fact that the guide element consists of passing along the length of the section of the guide tear-off plow castings, which as an integral part of the cast receiving pockets, and/or the profile of the gutter reverse side goaf, and/or at least one guide part for podkovernoi plate detachable plow. Many inevitably required when considering the type sections of the guide plane of the welding steps can save implementation guide element as castings with cast receiving pockets, cast profiles, gutters and/or cast of the guide part. At the same time fall welded edges in the direction of tear of the plane and, accordingly, podkovernoi plate detachable plow, which may optionally be exposed in welded structures increased wear, for example, due to inaccuracies of manufacture.

According to a preferred implementation of both cast in the pilot elem is NTE receiving pocket is made differently, and one of the receiving pockets has an extension to base retainer rod. Selection of appropriate locking devices of the rod then it is possible with relatively minor installation costs be achieved preferably by a geometric circuit mounting screwless terminal connection of the pans of the conveyor in receiving pockets adjacent sections of the guides detachable plow without additional elements or parts on the sections of the guide plane, which should be welded. Solid perform receiving pockets on the guide element ensures at the same time, the dimensional stability and the accuracy of relative position between lying in assembled condition in the neighborhood and the clamping rods screwless connection of the pans of the conveyor receiving pockets.

According to a next preferred option run covering element consists of made as a single casting housing with molded protrusion forming in inspection hole partial portion of the upper channel to the conveyor chain. It is particularly preferred if in the inspection hole of the upper channel to the conveyor chain guide element has a molded bottom shelf, which runs to the side of the goaf behind the middle of the channel DL the traction chain and creates support for a plow chain when the removed cover. Therefore the corresponding execution molded shelf bottoms can be ensured even when the housing cover removed support for a plow chain, laid in the upper channel of the traction chain. At the same time, plow chain is quite affordable as housing with molded ledge frees the inspection hole in the lower channel to the conveyor chain and the upper channel for traction chain with a relatively large cross-section, so that the best possible installation in the chain, than hitherto. Next, the casting can be performed facing the lower and, respectively, the upper channel of the traction chain, the outer surface of the bottom shelf with the corresponding curves in order to improve the centering of the branches of the chain.

According to a next preferred option run on the upper side of the guide element is molded screw fixing screw covers. According to the preferred invention corresponding implementation guide element may be molded part of the base plate, which forms along the guide element from goaf work surface slides for podkovernoi plate and, accordingly, the support frame tear-off plane. The working surface forms, therefore, passing through according to the invention p is edocfile moulded part of the guide element. Then particularly preferably, if the guide element is equipped in the field of inspection holes cast in the bottom protruding supporting shelves for cover. Unit-cast performing reference shelves, as well as screw fasteners reach, simple, and extremely stable mounting of the enclosure.

Further, preferably molded on the guide element part of the bottom at its end side stope can form located below and at a distance from the moulded profile gutter scraper edge. It also improves conditions in the lower channel to the conveyor chain by means of the respective rollers podkovernoi plate, and the edge goes completely and without welds or the like along the entire length of the guide element and at the same time, sections of the guide tear-off plane. On the bottom side of the bottom can be molded indentations, which are moulded or preferably welded elements vibrating chute with a convex-curved bottom, in order to improve the motion guide device detachable plow when the actuation control plane. Swinging chute may, in particular, when moving the horizon of the cutter, i.e. when the angle of inclination of the guide device detachable plow to Oistamo the bottom, to serve as a support with the pile-out space for the guide tear-off of the plane lying on the side of the reservoir. At the same time preferably located only at a distance from each other elements of the tilting runners reduce the total weight of the guide element and, together with the sections of the guides detachable plow.

According to a next preferred option complete cast profile gutters, bounding from goaf chute reverse for scrapers of the scraper conveyor can form its upper side reference edge for the item trough conveyor with lateral profiles and the profile of the trench from the side of the stope. Item trough conveyor preferably forms welded to the guide part, and due to the support element, the trough of the conveyor belt along the entire length of the guide element can be provided with a dense welding between the two partial elements. Item chute conveyor is made preferably by a welded portion welded to the bottom of the pipeline lateral profiles, welded receiving pockets and welded to the profile of the trench from the side of the stope, which together with the cast on guide element profile of the trench forms a trough reverse for scraper conveyor and, accordingly, limits the side. According to a further preferred implementation element the trough of the conveyor from the side of the stope can the t to be provided covering the profile of the trench from the side of the stope and side profile from stope welded ramp, which forms, on the one hand, the cargo platform when the forward movement guide device detachable plow for bulk ore and may form simultaneously from stope guide surface of the body of the plane in the guide tear-off plane. Particularly preferably, if the ramp has a bend between the lower, steeper section of the ramp and the upper, flatter section of the ramp in order to improve the dual function of the ramp and at the same time be counteracted by the upper, flatter section of the ramp unwanted yaw guide tear-off plane when advancing the guide tear-off of a plane.

According to a particularly preferred variant of execution in cast from out space on guide element receiving pockets and welded on the item trough conveyor receiving pockets are inserted identically performed terminals screwless connection of the pans of the conveyor. Through the use of both sides of the stope, and the goaf identical rods can be minimized supply of appropriate terminals in the face and at the same time greatly facilitated the delivery of spare parts. In particular, according to preferred implementation having independent value characteristic of the invention, the same rods so the e can be used as the connecting parts individual parts podtovarnik plates integral tear-off of a plane.

Further, preferably hinged cushion for swivel attachment containing the cylinder, hydraulic cylinder control the transverse slope of the conveyor plow may be made of two parts and cover are welded to guide the main part with the cast of the first part of the pillow on which Rethimno fixed by bolting end lock with the second part of the pillow. On connecting the console to return, therefore, to the already well-known welding of the composite connecting console, resulting in easier implementation guide element in the form of castings.

Further advantages and embodiments of the invention made it clear from the following descriptions schematically shown in the drawings example of manufacture corresponding to the invention the section of the guide tear-off plane. The drawings show:

figure 1 - in axonometric projection, in the disassembled view of the main structural parts relevant to the invention the section of the guide tear production;

figure 2 - in axonometric projection view from the goaf back of a fragment of the guide element;

figure 3 corresponding to the invention the section of the guide tear-off plane, a side view, partially in section;

4 is a schematic, vertically the vertical incision through the inspection hole of the guide element with planted casing;

5 is a view from the goaf on the back of two coupled via a screwless terminal connection of the pans of the conveyor sections guide tear-off plane, and

6 - in axonometric projection, corresponding to the invention the casing for locking the inspection hole.

Indicated generally in the drawings figure 1 section of the guide tear-off plane can be combined with the following identical executed sections of the guide tear-off plane in the guided tear line of a plane with integrated conveyor. Each section 1 of the guide tear-off plane consists of the casting guide element 10, to which is welded welded construction element 40 of the chute conveyor lying from goaf weld planes lying on in the direction of the stope side of the guide element 10. Further, each section 1 of the guide tear-off plane contains composite connecting the console 3 to the hinge base of the head is not presented here, the hydraulic cylinder control the transverse slope of the conveyor plow, also enshrined in centrepark on the reverse traverse. Connecting the console 3 is thus welded to the guide element 10, the main body 4, and ashamnu bolt-on to him through bolting 2 blanking piece 5, partial cushion which is formed in the main body 4 and in the end the castle 5 swivel cushion for the base of the head is not presented here, the hydraulic cylinder control the transverse slope of the conveyor plow.

Now the design of the guide element 10 is first explained with reference to figures 1-5. Consisting of casting the guide element 10 has a built-in and educated in the process of casting the top closed to inspection holes 11 channel 12 to the conveyor chain and the lower channel 13 to the conveyor chain, which is the opposite of the inspection holes side contains the entrance guide groove 14 for engagement podkovernoi plates are detachable plow. In operation the guide groove 14 is oriented to Oistamo slaughter and, accordingly, coal face, while the inspection hole 11 is oriented to the side of the goaf. Given this terminology, in the following also from time to time says: from the stope or from the goaf. Further, the guiding element 10 is integrally molded along the guide element 10 of the bottom part 15, which forms a lower side of a goaf working surface for the end podkovernoi plate side virabotannaya, as well as passing along the length of the guide element 10, the profile 16 of the gutter, which, as will be explained, forms a lateral guide surface for the scraper into the groove of the reverse chain scraper conveyor. The bottom side 16' and forming the working surface of the upper side 15' bottom of the bottom limit lock groove 14 for engagement podkovernoi plate, and the bottom end part on the side of stope forms a scraping edge 36 for podkovernoi plate. At the same time the reverse side 16 of the profile 16 of the gutter in the guiding element 10 forms a guide slides for roller from goaf not presented here podkovernoi the stove.

Within the lower guide channel 13 for traction chain is not presented here traction plow chain pulling her branch is attached from the side of the goaf to podkovernoi plate tear-plow, whereas the branch reverse traction plow chain takes place in the upper channel 12 to the traction chain. To protect the upper channel 12 to the traction circuit against excessive penetration of fine coal, on the face side 17A of the guide element coaxially guiding channel 12 is forward 18A centering ring, which is in concert with him made the receiving ring 18V to another is oraway side 17B of the guide element 10. For the lower guide channel 13 for traction chain molded in the proper execution on one end side 17A protruding Eqs 19A, which covers made in concert with him on the other side 17V speed sampling of the 19th century, through to overlap to achieve the closing the gap in the connection between two adjacent sections 1 guide tear-off plane. Also cast in the pilot element 10 profile 16 of the gutter, as demonstrated by figure 2, extends slightly beyond the end face 17A, so that the profiles 16 runners turned out to overlap the connecting joint of two adjacent sections 1 guide tear-off of a plane.

On guide element 10 in the portion 20 of the rear wall of the goaf for one cast the first receiving pocket 21, which is essentially by geometric circuit engages the head 50 of the rod 51 screwless connection of the pans of the conveyor resistant to stretching and limited flexible mounting adjacent sections 1 guide tear-off plane, as clearly seen in figure 2 and 5. On the other end side of the guide element on the back side 20 for one cast to the next receiving pocket 22 with different geometry. Only the receiving pocket 21 has an extension 23 to the reverse side pocket, in which R is themno inserted locking element 53 to provide fixation in both receiving pockets 21, 22 scalawags their heads rods 51 screwless connection of the pans of the conveyor. Therefore, the receiving pocket 21 is open to the back side, while the receiving pocket 22 to the back side closed.

On the upper side 24 of the guiding element 10 as a whole is molded screw 25. Inspection holes 11 are locked, respectively, using the casing 60, which passes through the upper channel 12 to the conveyor chain and the lower channel 13 for traction chain guide element 10 and are presented in figure 4-6.

The casing 60 through molded screw fasteners 25 can be attached to a guide element 10 is relatively simple manner. Between the two inspection holes 11 of the guide element 10 is provided to reduce the weight of the grooves 26 of the box-shaped connecting surface 27 for welding the main body 4 connecting the console 3. As the connecting surface 27 on the guide element 10 and the corresponding connecting surface 4' on the back side of the main body 4 are linearly on the height of the guide element 10 and, accordingly, the main body 4. Further, the guiding element 10 in the area of both the inspection holes 11 and, respectively, in the transition to part 15 of the bottom to an inspection hole 11 is formed of molded support shelf 28 that is advised to secure the casing 60 by means of made in one piece on the guide element 10 of the tabs on the bottom edge of the inspection hole 11. To limit side of the bottom of the upper channel 12 to the conveyor chain in the field of inspection holes 11 of the guide element 10 provided with a top cast profile 16 of the gutter cast and passing to the side of the goaf behind the middle of the channel 12 to the traction chain, shelf 29 of the bottom, equipped with free step edge 30 which interacts with a complementary step of the outstanding forward protrusion 61 on the inner side of the casing 60. Therefore, the cover 60 is preferably made as a casting with unit-cast projection 61. Further, the cover 60 on the upper side 62 is formed of solid plates 63 for fastening shrouds, on the reverse side is solid handle 64 and the lower edge - molded metal strap 65. Production casing 60 in the form of a casting can occur in such a way that at a Central location provided by injection funnel 68, which, however, were worked out when in use the casing 60, however, was not completely removed, in order to mould the individual parts on the casing 60 when casting. On containing the protrusion 61 of the inner side of the casing 60 has, respectively, for both channels 12, 13 to the conveyor chain guides poluchasa 66 and, accordingly, 67, which closes the channel to the conveyor chain 12 and, respectively, 13 on the side of a goaf with minimized wear the e motion a chain of branches in the mounted state of the housing 60.

To form the guide section 1 1 detachable plow with a guiding element 10, are welded, in addition, from the stope element 40 of the trough conveyor, which, as shown by figures 1 and 3, is composed of welded construction. It contains the bottom 41 of the conveyor, on the upper side of which is welded by a goaf side profile 42 and side stope - side profile 43 to limit the transport chute 44 of the conveyor integrated guiding device of tear-plane, with the two side profiles 42, 43. The ends of the one held in the transport chute 44 scraper chain scrapers are thus facing each other and properly molded to the inner sides of the two side profiles 42, 43. On the bottom side of the bottom 41 of the conveyor welded profile 45 gutters from stope to work with the cast on guide element 10 profile 16 of the gutter to form an open down the chute 46 reverse for chain scraper. The bottom 41 of the conveyor is superimposed formed below the side profile 42 from goaf edge from goaf to cast on guide element 10 and having a continuous flat upper side 31 of the profile 16 of the gutter, so that it forms, therefore, the reference kr is the MCA for the item 40 of the trough conveyor. By means of welds between the bottom 41 of the conveyor and the profile 16 of the gutter, and also between the upper side profile 42 and the front plane of the guide element 10 can achieve a stable welded connection between the element 40 of the trough conveyor and guiding element 10.

The element 40 of the chute conveyor is supplied from the side of the stope is shown in figure 1 ramp 47, which exceeds the height of the element 40 of the trough conveyor and covers the side profiles and profiles 43, 45 gutters from stope. Ramp 47 includes curved toward each other the lower, cool protruding section 47A of the ramp, which can optionally keep the body of the plane, and the upper, more hollow receiving section 47B ramp that rises up to a ledge 48 of the side profile 43 from out space to hold bulk ore via the frame 47 in the transport chute 44. Next, from the side of the stope welded receiving pockets 49, which can be inserted their heads terminals screwless connection of the pans of the conveyor, and these terminals screwless connection of the pans of the conveyor preferably be the same as those rods 50 screwless connection of the pans of the conveyor, which will come into effect from goaf in the guide member 10 sections 1 guide tear-off page is ha

All components relevant to the invention section of the' guide 1 detachable plow can be provided for reducing the weight of the samples and, accordingly, the slots. In the guiding element 10 is formed on the lower side of the series of samples 32, which may be inserted and welded elements 33 of the tilting runners with convex-curved lower edge. Both are welded to the element 40 of the chute conveyor receiving pocket 49 to rods 51 screwless connection of the pans of the conveyor can also be welded with a side profile 43 from the side of the stope and the profile 45 gutters from stope, in order to secure the element 40 of the trough conveyor. Positioning the cargo ramp 47 is preferably chosen so that the steeper the plane 47A ramp in assembled condition, is on the same level as the guide plane 16 on the opposite side of the profile 16 of the gutter in the guiding channel 13 to the conveyor chain so produced by the body of the plane on section 1 of the guide tear-off plane horizontal forces lie on the same plane, and the tendency of the sending device detachable plow to the tendency to climb or dive with the passage of the sheet plane decreases.

For professionals from the preceding description, are obtained numerous modifications that should be included in casinolist following claims. Depending on the specific case the individual elements of the guide element could also consist of separate parts that are not are cast, and welded. The drawings illustrate only a preferred example of the production.

1. Section guide tear-off plane for posting the tear-plough pull on the chain containing the guide element (10)located at the side of goaf from a limited lateral profiles (42, 43) of the transport chute (44) and limited profiles (16, 45) chute (46) reverse conveyor having an upper channel for traction chain (12) and is provided open to Oistamo the bottom guide groove (14) for engagement podkovernoi plate detachable plow, bottom channel for traction chain (13), and in this guide element (10) can Rethimno to gain a foothold, at least one covering element for locking the inspection hole (11) for both channels for the traction chain (12, 13), located on the guide element (10) connecting the console (3) to cylinder control the transverse slope of the conveyor plow and with pockets for receiving the heads of the terminals screwless connection of the pans of the conveyor for hard tensile connect adjacent sections of the guide tear-off plane, characterized in that the guide element (10)consists of passing along the length of the section (1) of the guide tear-off plow castings, where as an integral part of the cast receiving pockets (21, 22), and/or profile (16) of the chute (46) reverse side goaf, and/or the guide part (16", 15) for podkovernoi plate detachable plow.

2. Section guide tear-off plow according to claim 1, characterized in that both the receiving pocket (21, 22) is made differently, and one of the receiving pockets (21) has an extension (23) for receiving the locking element (53) screwless terminal connection.

3. Section guide tear-off plow according to claim 1 or 2, characterized in that the covering element consists of the casting of the casing (60) with cast forming in inspection hole portion of the upper channel (12) for the traction chain protrusion (61).

4. Section guide tear-off plow according to claim 1 or 2, characterized in that the upper channel (12) for the traction chain inspection hole (11) contains a molded shelf (29) of the bottom, which stands to the side of the goaf behind the middle of the channel (12) for the traction chain and makes it possible to support the plow chain when the removed cover.

5. Section guide tear-off plow according to claim 3, characterized in that on the upper side (24) of the guide element (10) is molded screw (25) screw covers.

6. Section guide tear-off plow according to claim 1, the call is connected with the fact, that the guide element (10) comprises a cast part (15) of the bottom, which forms from out space along the guide element (10) working surface (15') for podkovernoi plate detachable plow.

7. Section guide tear-off plow according to claim 6, characterized in that the guide element (10) in the area of the inspection hole (11) provided with molded with the protrusion on the bottom of the supporting shelves (28) of the casing (60).

8. Section guide tear-off plow according to claim 6 or 7, characterized in that the molded on the guide element (10) part (15) of the bottom forms at its end side stope scraper edge (36)performed below and with distance from the moulded profile (16) of the gutter.

9. Section guide tear-off plow according to claim 6, characterized in that on the bottom part (15) of the bottom molded recesses (32), which are elements (33) of the tilting runners with convex-curved bottom (34).

10. Section guide tear-off plow according to claim 1, characterized in that the molded profile (16) trough its top side (31) forms a reference edge for the element (40) of the trough conveyor containing side profiles (42, 43) and profile (45) gutters from stope.

11. Section guide tear-off plow of claim 10, characterized in that the element (40) of the trough conveyor-welded design is Ktsia with welded on the bottom (41) of the pipeline lateral profiles (42, 43), receiving pockets (49) and profile (45) gutters from stope.

12. Section guide tear-off plow of claim 10 or 11, characterized in that the element (40) of the trough conveyor provided with a covering profile (45) gutters and side profile (43)welded from stope ramp (47).

13. Section guide tear-off of a plane at 12, characterized in that the ramp (47) has a bend between the lower steeper section (47A) of the ramp and the top of more gently sloping land (47B) ramp.

14. Section guide tear-off plow according to claim 1, characterized in that cast on the side of a goaf on guide element (10) receiving pockets (21, 22) and is welded to the element (40) of the trough conveyor receiving pockets (49) inserted identically performed rods (51) screwless connection of conveyor pans.

15. Section guide tear-off plow according to claim 1, characterized in that the connecting console (3) made of composite and has welded on guide element (10) main body (4) made in one piece the first part of the cushion, which uses the second part of the cushion Rethimno fixed blanking piece (5) to form a hinged cushion (6) for head cylinder control the transverse slope of the conveyor plow.



 

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18 cl, 8 dwg

FIELD: mining.

SUBSTANCE: invention refers to driving facility for sprockets of chain drives, particularly to drive of scraper-chain transporters or chain plane knives for underground mine developments. Drive incorporates the asynchronous electric engine and a gear box. Also the asynchronous electric engine consists of an engine with feeding from a frequency converter, while there is an intermediary two-speed sprocket gear box in the driving block between an engine shaft and the gear box; the intermediary gear box is designed in particular as the front gear box with one starting and one normal stage, when by means of the latter starting effect in the starting stage can be achieved, which is required for starting of loaded scraper-chain conveyer or for free pulling of the chain plane knife.

EFFECT: regulating rotary speed and torque of asynchronous electrical engines.

22 cl, 3 dwg

FIELD: mining.

SUBSTANCE: proposed section of tear-off planer comprises guide element arranged on the side of mined-out space from haulage chute and return travel conveyor chute, upper channel for haulage chain and lower channel for haulage chain, and guide slot, open towards breakage face, for engagement of under-conveyor plate of tear-off planer. Note here that said guide element can carry at least one cover element to stop inspection hole for both haulage chain channels that comprises connecting cantilever for hydraulic cylinder to control conveyor unit inclination and receiving bins for heads of boltless joint between conveyor chutes in rigid joints of adjacent sections of tear-off planer guides. Guide element consists of casting incorporating receiving pans, and/or return travel conveyor chute sections on the side of mined-out space, and/or guide for under-conveyor plate of tear-off planer.

EFFECT: longer life, efficient use.

15 cl, 6 dwg

FIELD: mining.

SUBSTANCE: guide for pulling chain of mining machine, namely for chain of plough on mining plough with drive stations and/or rotary sprockets of pulling chain (11), which are installed in end sections of mining machine, and at least with one element (21; 121) of the guide for chain, which are spatially located near chain sprockets (18) on drive station and/or turning station and pressed across chain movement direction to its load and/or empty branch. Element (21; 121) of chain guide includes at least one pressure roller (22; 122) pressed to links (33) of pulling chain (11); at that, pressure roller (22; 122) is installed on roller axis (29; 129) with possibility of rotation and replacement together with it. Axis (29; 129) of pressure roller (22; 122) rests on brackets (28, 28A; 128) of bearings, which are installed in receiving pocket (40; 140); besides, brackets (128) of bearings in receiving pocket (140) are protected against unfixturing at least by means of one retractable fixture (190). Pressure roller (22; 122) has bearing race (23) matched with enveloping surface (34) determined with links (33) of the chain. Pressure roller (22; 122) is arranged in lead-in unit (25; 125) installed in inlet section (19) of drive station and/or turning station (17) with possibility of being replaced. Brackets (28, 28A; 128) of bearings are installed in receiving pocket (40; 140) with possibility of being replaced. Brackets (28, 28A) of bearings in receiving pocket (40) are protected against unfixturing by means of a hinged cover (35). Upper bracket (128) of bearing is equipped with guides (173) for retractable fixtures (190). Above receiving pocket (140) there installed are retaining units (166) with fixing seats (165) facing each other, and retractable fixtures (190) have fixing projections (198) which are locked in fixing seats (165) to protect upper bracket (128) in receiving pocket (140) against unfixturing. Guide includes pair of retractable fixtures (190); at that, each retractable fixture (190) has U shape with base (191) and three elbows of which one extreme elbow (193) and intermediate elbow (194) on outer sides facing each other are equipped with guide planks (195, 196) to be installed in guides (173) with form closure, and the second extreme elbow (192) has passage opening (199) for locking bolt. At the bottom of receiving pocket (14) there located is lower seat (155) for roller axis (129), and is mainly made in lead-in unit (125) as a part of it or rigidly attached to it. Guide includes several pressure rollers pressed or to be pressed to chain (11) and located one after the other in chain movement direction. Pressure roller (22) is pressed to chain under action at least of one elastic element. Pressure roller (22) is pressed to the chain under action at least of one shock absorber.

EFFECT: improved wear resistance of the chain.

12 cl, 7 dwg

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