FR2527181A1 - ARTICULATED STRIP FOR CONVEYING AND LEVELING CHANNELS, AND SCRAPPING CARRIER EQUIPPED WITH SAID STRIP - Google Patents

Abstract

THE INVENTION RELATES TO AN ARTICULATED BELT FOR CONVEYING AND LEVELING CHAINS, AS WELL AS A SQUEEGEE CONVEYOR EQUIPPED WITH THIS BELT. THE SAID BAND INCLUDES IDENTICAL LINKS 2, 3, 4 INTERPENETRING, WHOSE FRONTAL FACES 7 EXTEND PERPENDICULARLY TO THEIR BRANCHES 6 AND ARE BOMBED, WITH A CONVEX BOMB EXCEEDING THE SAID BRANCHES 6 AT THE EXTREMITES OF 12, 13. 15 OF THE LINKS 2, 3, 4 ARE LOCATED EXACTLY AT THE CENTER OF ONE OF THEIR BRANCHES 6. APPLICATION TO ARTICULATED BELT CONVEYOR DEVICES.

Description

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  The present invention relates to a

  abutment constituted by identical links interpenetrating, preferably for conveying and leveling chains in corresponding devices for the construction of underground tunnels and tunnels. Articulated bands of this type, having identical links penetrating into each other, are used for the most diverse purposes for the digging of underground galleries In this case, these articulated strips are exposed to particular wear, because they rub against the guide plate in the case of conveyors and against the guide elements in the case of leveling installations, and because they are subject to considerable wear as a result of permanent contact occurring in part In recent years, the development of conveying and leveling chains has taken place exclusively in the direction of a sizing larger and larger, that is to say 18 cm x 64 cm ; 19 cm x 64.5 cm; 22 cm x 86 cm; 26 cm x 92 cm; 30 x 108 cm,

  to reach today 34 cm x 126 cm.

  However, this development of articulated bands giving them larger and larger dimensions is not satisfactory because, if the larger dimensioning articulated chalks increases their life, the problems encountered persist or become even more

  These problems are particularly

  to link in the difficult introduction of force in the articulated band, in the dimensions of the star wheels associated with these bands, in the wear of the links of the chains, in the hardening of the chain in different places and in the persistent wear which precisely strongly influences

the carrying section.

  The wear occurs first in the surfaces-

  of the chain on the conveyor or of the chain-grader in the direction of the guide elements The articulated bands lose a significant part of their section, so that the bearing section decreases gradually Moreover, as a result of formation of martensite due to friction, it occurs in these areas of untimely hardening

  result in a decrease in the ability of the

  In addition, these phenomena constitute

  kill primers or starting points of stress corrosion cracking, which very often

  premature replacement of such strands of chains.

  Force introduction occurs through

  star wheels, the contact between the star wheel and the round link chain can only be

  punctuality, which causes very

  These chains are used for a long time and have very visible notches due to the engagement of the star wheel. These zones of introduction of force constitute a considerable point.

  weak round-link chains and they also limit

  The other disadvantage is that corresponding wear phenomena naturally occur also on the star wheels, which means that they must be replaced very often. In addition, the star wheels are subject to additional stress because, as a result of the configuration of the links in the chain, large lateral forces

  counterbalanced and absorbed by a corre-

star wheel.

  The object of the present invention is therefore to increase the service life of conveying chains and

  leveling without changing their nominal dimensions, that is,

  to say without increasing their dimensioning, and to allow an optimal introduction of force in the articulated band

  through the star wheel.

  According to the invention, this object is achieved by the fact that the front faces of the links extend perpendicular to the branches of these links and are curved, with a convex bulge exceeding said

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branches at the ends.

  Such a link can, as before, be assembled

  other identical links to form an

  the convex configuration of the outer face of this link giving birth in this case, so

  advantageous, to predetermined wear zones which allow

  long-term wear without affecting the bearing section of each link considered.

  because of the right angle configuration of the fronts

  of the link, the point constraint imposed so far on the articulated web in the star wheel is replaced by a linear contact which leads to a reduction

  surface pressure Therefore, not only

  The wear of the wheel itself is avoided, or at least considerably reduced, not only the wear of the links in the star wheel, but also results in a significant increase in the service life of the articulated belts. as well as the star wheel, the lateral forces which have been manifested up to now are then advantageously completely avoided, so that

  the realization of the star wheel can be considerable-

simplified.

  According to the invention, to guarantee a contact

  favor of each link considered on the merits of the trans-

  carrier, and therefore a regular wear of all the parts subject to wear, the convexly convex ends of the end faces and the branches of the links are configured to form a concave outer face of each link, bearing surfaces being predetermined, in both

  end zones of each link, with a view to

  on the bottom of the conveyor or on the guide elements Thus, in addition to the far preferential embodiment with convex bulge of the end faces of each link considered, it is given birth in the

  direction of the branches of this link to additional protrusions

  which guarantee a perpendicular support surface

  of the link in its two end zones. This produces not only point friction surfaces,

  but in addition to the linear or super-

  which stabilize the link in question.

  wear is spread over a larger area and it is

  ness of the child (the material has to be received before a reduction can actually occur

  of the carrying section of each link considered.

  According to the invention, to obtain

  optimum surface area or wear area,

  the radius of the concave external face is chosen corresponding to

  This improves at the same time the already mentioned stabilization of each individual link within the articulated belt. The loss of material caused by the wear surfaces is negligible for the lifetime of each link considered, being given that it occurs in areas that do not reduce the bearing section of this link, and because there may be curing in these areas due to

  martensite resulting from friction, as well as a corro-

  cracking due to the constraint, without harming

to the link itself.

  The internal realization of the link according to

  the invention is identical to that of conventional links.

  In one embodiment of the invention, it is provided that each link has internally notches which receive the front faces and which are open towards the branches of the links. Under these conditions, each individual link has a freedom of movement. in both directions in its respective adjacent link, so that the hinged belt itself is easy to transport and mount. In addition, shocks and other stresses can be absorbed such deteriorations

as deformations for example.

  The links assembled to form a working band

  abutments are usually made from a round steel bar which is correspondingly deflected and then

  is bent to form a link The configurations required

  brought to the front faces or areas that are

  connect to the branches of the links can be

  With the aid of the invention, it is provided that the weld zones of the links are located exactly in the center of the center of the chamber. one of the branches of said links, which also makes it possible to manufacture a link in two parts, in which case the welding zones must be substantially offset

  from each other in the region of the branches of the links.

  Articulated bands of this type are used in scraper conveyors and in leveling installations. The configuration of the individual links requires a corresponding adaptation of the conveyors.

  scrapers as well as leveling facilities.

  According to the invention, a scraper carrier com-

  taking a conveyor chain equipped with driving

  scraping channels at the bottom of which said conveyor chain passes rubbing, and star-shaped wheels arranged at the ends and having toothed disks which receive and guide said conveyor chain, are made in such a way that the toothed discs of said star wheels have straight flank teeth, but also have a recess

  or receiving receiving the front faces of the

  This makes it possible to simplify the star wheels considerably, but in particular also to introduce the forces

  linearly in a manner adapted to the corresponding front faces.

  of the links, so that the toothed disk or the

  star wheel no longer has to absorb lateral forces.

  According to one embodiment of the invention, to ensure a force introduction directed to or limited to the support portions of the links, the width of the edges of the teeth of the star wheel is chosen to correspond to the diameter of the branches of the links. In this way, the marginal regions of the links, which are subject to usture, do not directly affect the introduction of force, which is, inter alia, advantageous because, in

  the contrary case, in case of wear of these regions, the introduc-

  Force would shift each time to the center of the link, that is to say, it would change in the long run. According to the invention, to guarantee also a good regular guidance of the links arranged on edge, the inner flanks of the teeth of the toothed discs comprise recesses in which the ends to bulge

  convex end faces of the links can be inserted.

  The invention is characterized in particular by the fact that, in case of wear of the chain, the convex embodiment of the outer face of each link considered excludes first and foremost a wear of the bearing section at the center of said link. curved realization of

  frontal faces of this link makes it possible to obtain sufficient

  of material subject to wear for a long period of time

  This loss of material plays a negligible role

  for the life of the link, since it occurs in areas that do not reduce the bearing section of this link In the link and the scraper carrier according to the invention, the introduction of force into

  the articulated band takes place linearly.

  A considerably smaller reduction in wear results in a further reduction of wear while further optimizing the introduction of force. A further reduction in the stress imposed on the links and especially on the star wheels results from the fact that the star wheel

  no longer has to absorb lateral forces.

  The invention will now be described in more detail with reference to the accompanying drawings, by way of non-limiting examples and in which: Figure 1 is a fragmentary view partially in section of an articulated strip; Figure 2 is a fragmentary fragmentary sectional view of an articulated strip constituting the central chain of a scraper conveyor;

  FIG. 3 is a view with partial section illus-

  trant an individual link; and Figure 4 is a side elevation of a wheel

in star.

  The articulated band 1 illustrated in Figure 1 consists of several identical links 2, 3 and 4 These links penetrate into each other and thus enjoy a freedom of movement in the horizontal direction

  also being able to rotate in their respective neighboring link.

  Branches 6 of the links 2, 3 and 4 are sections of cables or bars, that is to say bars of round section Their front faces 7 are also of round or curved construction, but their edges are

  oriented at right angles to said branches 6.

  Clearly, this results in a straight edge that allows linear transmission of forces when entering a star wheel and when introducing

of forces.

  Ends 8 of the front faces 7, made

  with a convex curve, protrude from the branches of the links.

  This provides a wear zone which protects for a long time the bearing section of the branches 6 of any wear and thus of any weakening. An outer face located in end zones 12 and 13 of each

  at the same time serves as support and stabilizer

  When the articulated belt is towed over a bottom 18 of the conveyor In FIG. 1, this bottom 18 is represented by a single line to highlight the extent of the bearing surface of the individual links.

  in their two end zones 12 and 13.

  Each link internally presents samples

  11 which receive the end faces or the end portions of the adjacent links 2,3 and 4 These notches are open towards the branches of the links, which allows said individual links to move the

in each other.

  Figure 2 shows an articulated band 1 used

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  as a central chain of a conveyor 17 with scrapers.

  The profile of this conveyor 17 is predetermined in such a way that individual drive members or scrapers 19 are guided and stabilized laterally, so that the articulated band 1 occupying a central position no longer has to perform stabilization functions and of

  These functions are more

  by means of the retaining elements of the chain, to which is given for this purpose an appropriate configuration, that is to say on a squat basis As a result of the particular embodiment of the articulated band 1, such retaining elements are not not necessary because said tape 1 can itself perform support functions, as shown

Figure 2.

  FIG. 3 is a plan view of a link which also clearly emerges the surfaces of the end zones 12 and 13 which provide support and absorb wear. A welding zone 15 is illustrated.

in the center of branch 6.

  FIG. 4 finally illustrates a star wheel 20 provided with a toothed disk 21. This disk 21 has teeth 22 with straight flanks 23. This design of the flanks 23, favorable for the introduction or transmission of the forces, is made possible by the particular configuration of the links 2, 3 and 4 When these links pass through the star wheel, each link considered is in a recess or in between 24 The link disposed on edge is relegated in itself by its end zones 12 and 13 to the outside of the teeth 22 considered As a result of the rotating movement of the star wheel, however, there are contacts between the front face 7 of each link 2,3 or 4 considered and the tooth, internal flanks

  26 teeth 22 having for this purpose recesses 27.

  It goes without saying that many modifications can be made to the articulated band and the carrier

  described and shown, without departing from the scope of the invention.

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Claims (7)

  1 Articulated strip consisting of identical links interpenetrating, preferably for chains   conveying and leveling equipment in corresponding devices.   laying of underground galleries and   tunnels, characterized in that the frontier faces   (7) of said links (2,3,4) extend perpendicularly   the branches (6) of these links and are curved, with a convex bulge protruding from said branches to ends.   2 Articulated strip according to claim 1, characterized   characterized in that the convexly curved ends (8) of the end faces (7) and the legs (6) of the m4 aillons are configured to form a concave outer face (10) of each link (2; 3; 4), surfaces   in the two end zones,   (12, 13) of each link, with a view to   the bottom (18) of the conveyor or on the guide elements.   3 Hinged strip according to claim 2, characterized   characterized in that the radius of the concave outer face (10) is chosen to correspond to the internal length links (2,3,4).   4 Articulated strip according to claim 1, characterized   characterized in that each link (2; 3; 4) internally has notches (11) receiving the end faces (7) and open towards the branches (6). links.   Articulated strip according to claim 1, characterized in that the weld zones (15) of the links (2,3,4) lie exactly in the center of one branches (6) of said links.   Scraper conveyor comprising a conveyor chain provided with driving members or scrapers, conveyor channels at the bottom of which said conveyor chain is rubbed, and star-shaped wheels arranged at the ends and having toothed discs which receive and guide said conveyor chain, 252718 1.   characterized in that the toothed disks (21) of said star wheels (20) comprise teeth (22)   with straight flanks (23), but also have a   cement or entredent (24) which receives the end faces (7) of the articulated strip (1). Scraper conveyor according to Claim 6, characterized in that the width of the edges of the teeth (22) of the star wheel (20) is selected to correspond to   to the diameter of the branches (6) of the links.   Characterized in that the inner flanks (26) of the teeth of the toothed discs (21) comprise recesses (27) in which the convexly convex ends of the end faces (7) of the links ( 2,3,4) can be inserted