Tensionable belt conveyor with robust tensioning device

Abstract

A tensionable belt conveyor device (24, 26) for conveying mineral material comprises: - a device frame (30), - a rotatable pulley (36), - an endless conveyor belt (32), - a bearing block (60) which rotatably supports the deflection roller (36) as a tensioning deflection roller (36), and - a tensioning device (34) for displacing the tensioning deflection roller (36) relative to the device frame (30), wherein the tensioning device (34) has a threaded rod arrangement (38). The threaded rod arrangement (38) has a first threaded rod (40) with a first adjusting nut (64) and a second threaded rod (42) with a second adjusting nut (66), wherein the first threaded rod (40) is fixed in a translationally immovable manner to a structure comprising the device frame (30) and the first bearing block (60) as a first fixed structure (58), wherein the other structure in each case is physically supported as a first support structure (68) in the direction of the first fixed structure (58) by the first adjusting nut (64), wherein the second threaded rod (42) is fixed in a translationally immovable manner to a structure comprising the device frame (30) and the first bearing block (60) as a second fixed structure (58), wherein the other structure in each case is physically supported as a second support structure (68) in the direction of the second fixed structure (58) by the second adjusting nut.

Description

The present invention relates to a tensionable belt conveyor for conveying mineral material. The tensionable belt conveyor device comprises:a device frame,a first and a second deflection roller, each of which is supported by the device frame, wherein each deflection roller of the first and the second deflection roller is rotatable about a virtual roller rotation axis running transversely to the local conveying direction at the location of the respective deflection roller,a conveyor belt continuously circulating around the first and second deflection rollers,a bearing block arrangement having a first and a second bearing block, wherein the first and the second bearing block rotatably support a deflection roller made of the first and the second deflection roller as a tensioning deflection roller about its virtual tensioning roller rotational axis, wherein the first and the second bearing block are arranged along the virtual tensioning roller rotational axis at a distance from one another, anda clamping device for displacing the clamping deflection roller relative to the device frame along a displacement path which runs transversely to the virtual roller axis of rotation of the clamping deflection roller, wherein the clamping device for displacing the bearing block arrangement has a threaded rod arrangement with at least one threaded rod.Such a tensionable belt conveying device for a rock processing device with a crushing device and a screening device is known from CN 103950690 A. Each of the bearing blocks of the tensioning guide roller of the known belt conveying device is connected on opposite sides of the device frame to a pull-out device which can be pulled out along the conveying direction of the conveyor belt. The pull-out device comprises a guide rod carrying the respective bearing block and a guide housing surrounding the guide rod. The guide housing allows a degree of freedom of movement of the guide rod relative to the guide housing only along the rod longitudinal axis for movement of the guide rod into and out of the guide housing.The guide housing has, on its end region remote from the associated bearing block, which end region receives the longitudinal end of the guide rod remote from the bearing block, a through-opening through which a threaded rod, but not the guide rod itself, can pass. The threaded rod is received collinearly flush with the guide rod on a holder on the device frame. The threaded rod passes through a through-opening of the holder and is in screw engagement with an internal thread of the through-opening, so that by rotating the threaded rod the threaded rod can be advanced towards the guide rod or retracted therefrom. Thus, the bearing block can be displaced along the longitudinal axis of the rod by means of the guide rod by rotating the associated threaded rod.From GB 2 367 797 B an X-ray apparatus with a conveyor belt is known. The conveyor belt has a driven deflection roller and a tensioning deflection roller. The tensioning deflection roller, which is rotatable about its virtual tensioning roller axis of rotation, is accommodated on the device frame so as to be movable along a conveying path of the conveyor belt. A deflection roller axis which physically realizes the tensioning roller axis of rotation is loaded on both sides of the tensioning deflection roller by a helical spring in each case in the direction away from the driven deflection roller which is opposite along the conveying path. While the one spring abutment is formed by the physical deflection roller axis itself, the opposite spring abutment is formed by a support plate which is traversed by a threaded rod and is in screw engagement therewith. The threaded rod itself is axially supported on the device frame, so that by rotating the threaded rod, the support plate can be displaced towards or away from the physical deflection roller axis. This alters the biasing force exerted by the coil springs on the physical pulley axles.CN 204341867 U discloses a double-chain conveying device, the clamping deflection shaft of which, with sprockets arranged thereon, is displaceable by a link lever pivotably articulated on the device frame. The clamping deflection shaft is rotatable about a virtual clamping shaft rotation axis which passes through the articulated lever between the frame-fixed articulation point of the articulated lever on the device frame and the articulation point of a power device pivoting the articulated lever about the frame-fixed articulation point. By pivoting the articulated lever about the articulation location fixed to the frame, the virtual clamping shaft rotation axis and the clamping deflection roller are thus also displaced depending on the distance of the virtual clamping shaft rotation axis from the articulation location fixed to the frame.The above mentioned known solutions are always complicated in structure and, as in the case of GB 2 367 797 B, are not suitable for use on a robust belt conveyor of a processing device for processing mineral materials.Furthermore, DE 200 16 940 U1 discloses a device for mounting sprocket units on the machine frame of a conveying device and DE 20 2018 100 599 U1 discloses a belt conveyor with an adjusting device for adjusting a distance between two conveying rollers in the conveying direction.It is the object of the present invention to specify a robust belt conveying device suitable for conveying mineral material, the continuously revolving conveyor belt of which can be tensioned and aligned to the required extent as robust as possible, simply and reliably by a tensioning device of as robust and simple construction as possible.Sufficient tension of an endlessly revolving conveyor belt is important for driving the conveyor belt as free from slippage as possible by a driven roller and for a preferably defined revolving movement of the conveyor belt during its conveying operation. In this case, adverse operating conditions prevail especially during the conveyance of mineral material owing to inevitably occurring mineral dusts and other contamination. In the case of a desired use of the tensionable belt conveying device on a crushing and / or screening device for mineral material, considerable mechanical swelling and changing loads are also added. Moreover, during operation of the conveyor belt, the conveyor belt travel may deviate from the desired course in the lateral direction.The present invention achieves the object mentioned on a tensionable belt conveying device mentioned at the beginning in that the threaded rod arrangement has at least one first threaded rod extending along a virtual first rod axis, each with a first adjusting nut carried by the first threaded rod in screw engagement, and has at least one second threaded rod extending along a virtual second rod axis, each with a second adjusting nut carried by the second threaded rod in screw engagement.With at least two threaded rods, i.e. at least one first threaded rod and at least one second threaded rod, a stable and robust connection can be produced between the first bearing block and the device frame with threaded rod semi-finished product always available as bulky goods or with always available standard components. The same applies to the at least two adjusting nuts, i.e. the at least one first adjusting nut and the at least one second adjusting nut. Although each component with an internal thread that can be traversed by a threaded rod in screw engagement and that can be displaced by screw movement along the threaded rod in screw engagement with a threaded rod, is an adjusting nut in the sense of the present application. However, adjusting nuts are preferably standard components with standardized internal threads, which fit the preferred threaded rods with standardized external threads.The described construction of the tensionable belt conveying device enables in an extremely advantageous manner the compensation of lateral belt running deviations.The at least one first threaded rod is fixed on a structure made up of the device frame and the first bearing block as a first fixed structure such that it cannot move translationally along the virtual first rod axis relative to the first fixed structure. The respective other structure comprising the device frame and the first bearing block is physically supported as a first support structure in the direction of the first fixed structure by the at least one first adjusting nut.Analogously to the at least one first threaded rod, the at least one second threaded rod is fixed on a structure made up of the device frame and the first bearing block as a second fixed structure such that it cannot move translationally along the virtual second rod axis relative to the second fixed structure, wherein the respective other structure made up of the device frame and the first bearing block as a second supporting structure is physically supported in the direction of the second fixed structure by the at least one second adjusting nut.Due to the self-locking of mutually matching internal and external threads with sufficiently low thread pitch, in particular of matching standardized internal and external threads, the at least one first adjusting nut can form a mechanical stop for the first supporting structure, which can be arranged precisely along the first threaded rod. The same applies to the at least one second adjusting nut in relation to the second supporting structure. Thus, the adjusting nuts can absorb high clamping forces without special measures having to be taken to secure the position of the adjusting nuts on the threaded rods which respectively carry them.As a result, the distance between the first fixed structure and the first supporting structure can be changed in a simple manner along the virtual first rod axis by rotating the at least one first adjusting nut relative to the at least one first threaded rod about the virtual first rod axis. Likewise, the selected construction makes it easy to change the distance between the second fixed structure and the second supporting structure along the virtual second rod axis by rotating the at least one second adjusting nut relative to the at least one second threaded rod about the virtual second rod axis.Preferably, each threaded rod carries exactly one adjusting nut. This can be secured in position on the threaded rod concerned by a lock nut in a manner known per se.The second bearing block of the bearing block arrangement can be arranged in any other manner so as to be displaceable relative to the device frame. However, it is preferably connected to the device frame in a spatially variable manner in the same manner as the first bearing block by the clamping device. This will be explained in more detail below.In a particularly simple embodiment, therefore, exactly one first and exactly one second threaded rod with a first and a second adjusting nut are sufficient to arrange the first bearing block at a desired distance from the device frame and thereby tension the continuously revolving conveyor belt.In principle, it is possible for the first and the second fixed structure to be different components, that is to say for example for the first fixed structure to be the device frame and the second fixed structure to be the first bearing block or vice versa. This also enables an arrangement of the first bearing block with a defined distance from the device frame. However, the setting of this defined distance via both threaded rods in the mentioned constellation can be more laborious than necessary. The first fixed structure is therefore preferably also the second fixed structure, so that the same component, the first bearing block or the device frame, can be fixed in its position along the displacement path in the direction of the respective other component of the first bearing block and device frame, that is to say to the first and to the same second supporting structure, by the at least one first adjusting nut and by the at least one second adjusting nut. The device frame is preferably the first and / or second fixed structure as the component of the two mentioned components that is richer in mass and as the component that is usually provided stationary with respect to the ground at the installation location. Particularly preferably, the device frame is the first and the second fixed structure. Consequently, the first bearing block, which is smaller than the device frame, is preferably the first and / or second supporting structure. Particularly preferably, the first bearing block is the first and the second supporting structure.The at least one second threaded rod is preferably further developed in the same manner as the at least one first threaded rod. Therefore, the statements made below with respect to the at least one first threaded rod also apply, mutatively, to the at least one second threaded rod, wherein the components cooperating with the at least one first threaded rod, such as a first fixed structure, a first supporting structure and a first adjusting nut, are to be replaced accordingly by the components cooperating with the at least one second threaded rod, such as a second fixed structure, a second supporting structure and a second adjusting nut.In principle, the first threaded rod can be permanently fixedly connected to the first fixed structure, for example by welding. However, this is not preferred for several reasons. On the one hand, the thermal distortion occurring during welding can necessitate straightening post-processing. On the other hand, a defective threaded rod can only be replaced with considerable effort.It is therefore preferably provided that the at least one first threaded rod passes through a first fastening formation of the first fixed structure, wherein the first fastening formation is clamped between two fixed-structure-side clamping formations connected to the first threaded rod. Alternatively or preferably additionally, it is likewise preferably provided that the at least one second threaded rod passes through a second fastening formation of the second fixed structure, wherein the second fastening formation is clamped between two fixed-structure-side clamping formations connected to the second threaded rod.The two fixed-structure-side clamping formations of the at least one first threaded rod or of the at least one second threaded rod can be two nuts which are tightened against the respective fastening formation in screw engagement with the respective at least one threaded rod. Even simpler and therefore more preferred is at least one first threaded rod of the at least one first threaded rod a threaded shank of a screw having a screw head connected to the threaded shank in a materially integral manner than a first clamping formation. Alternatively or preferably additionally, at least one second threaded rod of the at least one second threaded rod is a threaded shank of a screw having a screw head connected to a threaded shank in a materially bonded manner as a clamping formation. Particularly preferably, the at least one first and / or second threaded rod is a commercially available screw, for example with a standardized thread M 18, M 20, M 22 or larger or with a comparably large thread of another standardization. It is then sufficient to use a standardized nut as a further clamping formation in order to fix the at least one first threaded rod and / or the at least one second threaded rod to the respective fastening formation and to clamp the respective fastening formation between the clamping formations formed by the nut and screw head. Between a screw head and / or a nut on the one hand and the respective fastening formation on the other hand, at least one, preferably standardized, washer can be arranged.In an alternative embodiment, the at least one first threaded rod and / or the at least one second threaded rod can be fixed to the respective fastening formation by a threaded engagement with the latter. For this purpose, a through-opening of the fastening formation, into which a threaded rod protrudes or which is penetrated by a threaded rod, can have an internal thread matching the external thread of the threaded rod.By using a screw as the at least one first and / or second threaded rod, the threaded rod can advantageously be short. It ends at the screw head, which can abut against an abutment surface of the respective fastening formation.The first fastening formation is preferably formed integrally with the second fastening formation, for example as a bearing portion which is uniform in terms of material. If the fastening formation is formed or arranged on the device frame according to a preferred embodiment, a common fastening formation formed from the first and second fastening formation can be a, preferably planar, sheet metal portion which has sufficient through-openings for the at least one first threaded rod and the at least one second threaded rod. The joint fastening formation formed in this way can be connected integrally as a bending section to a further section of the device frame in order to increase the strength of the receptacle of the clamping device. However, a common fastening formation attached to the remaining device frames and / or connected in a materially integral manner should also not be excluded.In order to avoid unnecessarily large numbers of components, the at least one first threaded rod preferably has exactly one first threaded rod. For the same reason, the at least one second threaded rod preferably has exactly one second threaded rod.In principle, it may be sufficient to fix the at least one first threaded rod to the first fixed structure so as to be axially immovable only. A particularly simple change in position of the at least one first adjusting nut on the at least one first threaded rod by screwing the first adjusting nut without the required counter-holding of the at least one first threaded rod is made possible according to an advantageous development in that the at least one first threaded rod is arranged rotationally immovable about the virtual first rod axis relative to the first fixed structure. Alternatively or preferably additionally, the at least one first threaded rod is arranged rotationally immovable about the first virtual rod axis relative to the first supporting structure. A rotation of the at least one first threaded rod about its virtual first rod axis is not necessary for changing the distance between the fixed structure and the first adjusting nut. Alternatively or preferably additionally, the same applies in a mutatismutant manner to the at least one second threaded rod. It is also preferably arranged rotationally immovable about the virtual second rod axis relative to the second fixed structure and / or relative to the second supporting structure.Whereas in the prior art threaded rods, by means of which the distance between a tensioning deflection roller and the device frame can be varied, are frequently arranged at a distance from the tensioning deflection roller and its mounting, the tensioning device of the present application can achieve an advantageously short overall length in that the at least one first threaded rod protrudes into at least one first receiving opening of the first supporting structure and / or in that the at least one second threaded rod protrudes into at least one second receiving opening of the second supporting structure. Preferably, there are as many first receiving openings as first threaded rods. The same applies to the ratio of the number of second receiving openings to the second threaded rods.As has already been explained above, the respective adjusting nut on its threaded rod serves as a physical stop for the supporting structure, which is forced to the fixed structure by the reaction force caused by the prestressing force generated on the conveyor belt. The respective adjusting nut thus physically limits an approach between the supporting structure and the fixed structure.To further reduce the number of components required to form the clamping device, the clamping device is preferably free of spring components, that is to say components which, as a result of macroscopic elastic deformation, exert a force counteracting their deformation as a function of the degree of deformation. Although each component which is clamped, for example, by screws and nuts, is also a Hooke's spring in the strict scientific sense, the spring hardness of a component, which is caused by the dimensions of the component and the modulus of elasticity of the respective component material, is so great compared to a spring hardness of a spring component designed for elastic macroscopic deformation that the forces occurring cause only negligible elastic deformation, for example of 2 mm or less, at the clamping device in view of the overall dimension of the clamping device. The at least one first threaded rod and / or the at least one second threaded rod is or are preferably formed from steel, and likewise the at least one first adjusting nut and / or the at least one second adjusting nut.An even greater positional reliability of the first support structure can be achieved in that the at least one first threaded rod passes through a first retaining formation of the first support structure having the first receiving opening, wherein the first retaining formation is clamped between two support-structure-side clamping formations connected to the at least one first threaded rod. Alternatively or preferably additionally, according to the discussed preferred development, the at least one second threaded rod can pass through a second retaining formation of the second supporting structure, which second retaining formation has the second receiving opening, wherein the second retaining formation is clamped between two clamping formations on the supporting structure side connected to the at least one second threaded rod.Advantageously, one of the support structure-side clamping formations connected to the at least one first threaded rod can be the at least one first adjusting nut and / or one of the support structure-side clamping formations connected to the at least one second threaded rod can be the at least one second adjusting nut. For clamping the first or the second retaining formation, a further nut may thus be sufficient in addition to the respective adjusting nut, which nut is screwed onto the longitudinal end of the respective threaded rod passing through the respective receiving opening.As has been explained above, the first and the second supporting structure are preferably the first bearing block. The first bearing block is preferably formed at least partially in one piece, wherein for strength reasons and for reasons of good dimensional stability, the first and the second receiving opening are preferably formed on a one-piece section of the first bearing block. The first and the second retaining formation thus preferably form a common one-piece retaining formation, analogous to the common fastening formation described above. Further preferably, a separate receiving opening is provided for each threaded rod, which is traversed only by a threaded rod.A commercially available bearing block can advantageously be used as a first bearing block with a long service life if at least one rigid first intermediate piece is arranged between the at least one first adjusting nut and the first supporting structure, and / or if at least one rigid second intermediate piece is arranged between the at least one second adjusting nut and the first supporting structure. The intermediate pieces mentioned do not have to be provided, but can advantageously distribute the introduction of the supporting force locally from the adjusting nuts into the first bearing block to a larger component surface. For these reasons, it is again preferred if the first intermediate piece and the second intermediate piece are a one-piece common intermediate piece, which enables a large contact surface of a bearing side of the first bearing block on the common intermediate piece and thus an advantageous large-area introduction of the supporting forces into the bearing block. Preferably, the first and / or the second or the common intermediate piece is formed from metal, in particular from steel.If a plurality of first threaded rods is provided, the first threaded rods are preferably parallel to one another. The same applies to a plurality of second threaded rods provided. The virtual first rod axis and the virtual second rod axis are preferably parallel to one another in order to be able to bring about a change in distance between the at least one first adjusting nut and the first fixed structure and between the at least one second adjusting nut and the second fixed structure in the identical direction. This avoids unnecessary assembly forces. Still unnecessary, but sufficiently low, assembly forces due to misorientation of the virtual first rod axis and the virtual second rod axis relative to each other can be obtained by making the virtual first rod axis and the virtual second rod axis enclose an angle of not more than 15°.Undesired tilting moments and excessively unequal force distributions on the at least one first threaded rod and on the at least one second threaded rod can be avoided in that the at least one first threaded rod and the at least one second threaded rod are arranged in such a way that the elongated virtual tension roller rotation axis runs between the elongated virtual rod axes of the at least one first and the at least one second threaded rod.In addition, a guide structure of the clamping device which is present in the prior art in addition to the fastening structure can frequently be dispensed with. Preferably, the first bearing block is positioned relative to the device frame only by the above-mentioned components, optionally extended by one or more lock nuts for improved fixing and by one or more washers.As already indicated above, the second bearing block is preferably connected to the device frame analogously to the first bearing block at a variable distance from the device frame. For this purpose, it is preferably provided that the threaded rod arrangement has at least one third threaded rod extending along a virtual third rod axis with a respective third adjusting nut carried by the at least one third threaded rod in screw engagement and at least one fourth threaded rod extending along a virtual fourth rod axis with a respective fourth adjusting nut carried by the at least one fourth threaded rod in screw engagement.The described construction of the clamping device advantageously makes it possible to adjust the orientation of the clamping roller axis of rotation relative to the desired conveying direction of the conveyor belt and thus to counteract lateral belt travel deviations in a simple, quick and reliable manner. The clamping device may be a first clamping device which is inserted on the belt conveying device in addition to a second clamping device.The at least one third threaded rod is immovably fixed in translation along the virtual third rod axis on a structure made up of the device frame and the second bearing block as a third fixed structure, wherein the respective other structure made up of the device frame and the second bearing block as a third supporting structure is physically supported in the direction of the third fixed structure by the at least one third adjusting nut.The at least one fourth threaded rod is immovably fixed in translation along the virtual fourth rod axis on a structure made up of the device frame and the second bearing block as a fourth fixed structure, wherein the respective other structure made up of the device frame and the second bearing block as a fourth supporting structure is physically supported in the direction of the fourth fixed structure by the at least one fourth adjusting nut.In general, it applies that the statements made above with respect to the at least one first threaded rod and the first bearing block also apply to the at least one third threaded rod and the second bearing block, and / or that the statements made above with respect to the at least one second threaded rod and the first bearing block also apply to the at least one fourth threaded rod and the second bearing block. The same applies to the above-mentioned components cooperating with the at least one first threaded rod. Identical components can cooperate with the at least one third threaded rod in the same way as components are described cooperating with the at least one first threaded rod. The same applies to the at least one fourth threaded rod. Identical components can cooperate with this in the same manner as described above as cooperating with the at least one second threaded rod.The clamping device is preferably configured symmetrically with respect to a symmetry center plane orthogonal to the virtual clamping roller axis of rotation.The belt conveying device can have more than the two deflection rollers mentioned. However, the first and the second deflecting roller are at least necessary in order to functionally separate an upper strand of the continuously revolving conveyor belt that conveys mineral material from a lower strand that returns without material.The present invention also relates to a processing device, in particular a self-propelled processing device, for the comminution and / or sorting processing of mineral material, comprising a material feed, at least one comminution device, such as a crushing device, and / or at least one sorting device, such as a screening device, and at least one clampable belt conveying device as described and further developed above.In a preferred embodiment, the present invention relates to a tensionable belt conveyor for conveying mineral material:a device frame,a deflection roller rotatable about a virtual roller rotation axis extending transversely to the local conveying direction,a conveyor belt continuously circulating around the deflecting roller,a bearing block which rotatably supports the deflection roller as a tensioning deflection roller about its virtual tensioning roller rotation axis, anda clamping device for displacing the clamping deflection roller relative to the device frame along a displacement path, wherein the clamping device for displacing the bearing block comprises a threaded rod arrangement with at least one threaded rod.According to the invention, it is provided that the threaded rod arrangement has a first threaded rod, which extends along a virtual first rod axis and has a first adjusting nut, and a second threaded rod, which extends along a virtual second rod axis and has a second adjusting nut, wherein the first threaded rod is fixed on a structure made of device frame and first bearing block as a first fixed structure such that it cannot move translationally along the virtual first rod axis, wherein the respective other structure as a first supporting structure is physically supported in the direction of the first fixed structure by the first adjusting nut, wherein the second threaded rod is fixed on a structure made of device frame and first bearing block as a second fixed structure such that it cannot move translationally along the virtual second rod axis, wherein the respective other structure as a second supporting structure is physically supported in the direction of the second fixed structure by the second adjusting nut. The advantageous refinements explained above also apply to this embodiment.The present invention will be explained in more detail below with reference to the attached drawings. It represents: FIG. 1 is a perspective view of an exemplary rock processing apparatus including a tensionable belt conveyor of the present invention, FIG. 2 is a perspective partial view of a tensioning deflection roller supported by a first bearing block which is arranged on the device frame by means of a tensioning device in a position of maximum approach to the device frame, and FIG. 3 is a partial view of FIG. 2 with the first bearing block arranged at a maximum distance from the device frame.The figures are not to scale, but accurately represent the relative sizes of components and assemblies to one another.Referring now to FIG. 1, a mobile self-propelled rock processing apparatus is shown in perspective and generally designated 10. The rock processing device stands on tracked undercarriages 12 with which it can be moved between its place of use and a transport device or between two places of use.The rock processing apparatus 10 includes a material feeder 14 into which mineral material is input from a suitable device, such as an excavator or wheel loader.A vibratory conveyor 16 conveys the mineral material fed into the material feed 14 to a prescreen 18 as a first screening device. The rock processing apparatus 10 also accommodates a crushing device 20, for example an impact crusher, a cone crusher, a centrifugal crusher, a roller crusher or a jaw crusher, for crushing the charged and prescreened (presscreened) mineral material, and one or more further screening devices 22 for sorting the mineral material crushed by the crushing device 20 according to its grain size.Belt conveyors 24 and 26 convey crushed and sorted mineral material away from machine body 28 of rock device 10 onto dump-forming dumps beneath the respective longitudinal end 24 aand 26 aof belt conveyors 24 and 26 remote from machine body 28. The blades are not shown in FIG. 1. The belt conveying device 24 is a so-called "side discharge belt", and the belt conveying device 26 is referred to as a "breaker draw-off belt". The belt conveying devices 24 and 26 are identical in their basic construction and differ only in the dimensions of their components and in the design details of their components and assemblies, which however provide substantially identical functionalities.For the sake of better clarity, only the individual components of the breaker draw-off belt 26 are provided with reference numerals below. It is, however, apparent that the side discharge belt 24 comprises substantially the same components.The breaker draw-off belt 26 has a device frame 30, from which frame parts 30 aand 30 brun on both sides of an endlessly revolving conveyor belt 32 substantially parallel thereto. A local conveying direction of the conveyor belt 32 is indicated by the arrow FD.At the longitudinal end 26 aof the breaker draw-off belt 26 projecting from the machine body 28, there is a deflection roller, not shown in FIG. 1, of which only its roller axis of rotation RA is indicated by dot-dash lines. A further deflecting roller, likewise not shown in FIG. 1, is arranged at the longitudinal end of the breaker draw-off belt 26, which is not visible in FIG. 1 and is closer to the machine body 28. The latter deflection roller is preferably a driven deflection roller in order to keep the energy supply of the driven deflection roller short. The deflection roller at the projecting longitudinal end 26a, on the other hand, is a tensioning deflection roller which is more easily accessible for work on the tensioning device of the breaker draw-off belt 26.The rock processing apparatus 10 from FIG. 1 is known in its basic construction and in its mode of operation.FIGS. 2 and 3 show a detail of the protruding longitudinal end 26 aof the breaker draw-off belt 26 in a perspective view from the arrow II, III of FIG. 1. For the sake of better clarity, the continuously revolving conveyor belt 32 is omitted in FIGS. 2 and 3.At the longitudinal end of the frame part 30 b, a tensioning device 34 is arranged, which, by displacing the tensioning deflection roller 36 along a displacement path VB, tensions and relaxes away from the device frame 30 or from the frame part 30 band onto the latter or towards the continuously circulating conveyor belt 32 in order to ensure trouble-free operation thereof. FIG. 2 shows the tensioning guide roller 36 in its position which is at most approached to the device frame 30 or to the frame part 30 b, in which position a tension of the continuously revolving conveyor belt 32 generated by the tensioning device 34 is at its smallest.The clamping device 34 comprises a threaded rod arrangement 38 with a first threaded rod 40 and with a second threaded rod 42. The first threaded rod 40 is a threaded shaft 44 aof a commercially available screw 44, the screw head 44 bthereof resting as a fastening formation on the side of a fastening plate 46 facing away from the clamping deflection roller 36.The same applies to the second threaded rod 42. However, its screw head is covered in FIG. 2 by the frame part 30 b. The second threaded rod 42 is a threaded shank 48 aof a commercially available screw 48. the screws 44 and 48 are preferably identical.The fixing plate 46 welded to the frame part 30b is clamped to the first threaded rod 40 by the screw head 44b as a first clamping formation and by a clamping nut 50 as a second clamping formation with the interposition of a washer 52. The same applies to the second threaded rod 42 with the clamping nut 54 arranged there and the intermediate washer 56. The device frame 30 is therefore a fixed structure 58 in the exemplary embodiment shown.A washer 52 is likewise arranged between the screw head 44 bof the threaded rod 40 and the fastening plate 46. However, this is concealed in the figures by the fastening plate 46. Likewise, a washer 52 is preferably arranged between the screw head of the threaded rod 42 and the fastening plate 46.The tensioning deflection roller 36 is mounted in a first bearing block 60 about its virtual tensioning roller axis of rotation RA. The bearing block 60 is preferably a cast component produced in one piece, which supports a rotary shaft 62 of the tensioning deflection roller 36 by means of a plain bearing or alternatively by means of a ball or roller bearing. The first bearing block is part of a bearing block arrangement 61, which includes a preferably identically designed second bearing block at the opposite longitudinal end of the tensioning deflection roller 36.The first bearing block 60 has retaining formations 60 aand 60 bprotruding on opposite sides, which retaining formations each have a through hole, not shown in the figures, through which the first threaded rod 40 or the second threaded rod 42 passes.On the first threaded rod 40 a first adjusting nut 64 is received in screw engagement with the first threaded rod 40. On the second threaded rod 42 a second adjusting nut 66 is received in screw engagement with the second threaded rod 42. The first adjusting nut 64 and the second adjusting nut 66 limit an approach of the first bearing block 60 to the device frame 30 and to the frame part 30 b, respectively.The first threaded rod 40 extends along a virtual first rod axis VS 1, the second threaded rod 42 extends along a virtual second rod axis VS 2 parallel to the virtual first rod axis VS 1.In the exemplary embodiment shown, the bearing block 60 forms a supporting structure 68, which can be positioned by rotating the adjusting nuts 64 and 66 along the displacement path VB parallel to the virtual rod axes VS1 and VS2 and is supported on the adjusting nuts 64 and 66 with the interposition of a one-piece intermediate piece 70.In the exemplary embodiment shown, the intermediate piece 70 is a metal plate which distributes the supporting forces which occur locally at the adjusting nuts 64 and 66 and act back on the bearing block 60 to a larger acting surface of the bearing block 60 and thus reduces the local load thereof due to the support on the adjusting nuts 64 and 66.The bearing block 60 is secured to the threaded rods 40 and 42 by further clamping formations on the support structure side in the form of clamping nuts 72 and 74. The clamping nut 72 forms, together with the first adjusting nut 64, clamping formations on the support structure side which fix the holding formation 60 abetween them in a clamping manner on the first threaded rod 40. Together with the second adjusting nut 66, the clamping nut 74 forms clamping formations on the support structure side, which clamping formations fix the holding formation 60 bbetween them in a clamping manner on the second threaded rod 42. To protect the retaining formations 60a and 60b, a washer 76 and 78, respectively, is arranged between the clamping nuts 72 and 74 and the respective retaining formation 60a and 60b. Likewise, at least one washer is preferably arranged between the adjusting nuts 64 and 66, on the one hand, and the respective retaining formation 60 aand 60 b, respectively. However, these washers are covered in the figure by the retaining formations 60a and 60b and by the intermediate piece 70.FIG. 3 shows the tensioning deflection roller 36 with its first bearing block 60 in the position at maximum away from the device frame 30 or from the frame part 30 balong the displacement path VB. The commercially available screws 44 and 48 having the threaded rods 40 and 42 can be, for example, screws with a metric thread M20.In addition to the threaded rods 40 and 42 and the adjusting nuts 64 and 66, the clamping device 34 does not require any further components after the threaded rods 40 and 42 have been fixed to the device frame 30, in order to fix the position of the virtual clamping roller rotational axis RA along the displacement path VB relative to the device frame 30. In particular, no guide structure, such as guide rails or guide rods, is required.A tilting moment of the first bearing block 60 at the supporting points of the threaded rods 40 and 42 is ruled out in that the elongated virtual clamping roller rotational axis RA is situated between the elongated virtual rod axes VS 1 and VS 2, preferably at the same distance from each of the virtual rod axes VS 1 and VS 2.The longitudinal end of the tension deflection roller 36, which is not shown in FIGS. 2 and 3 and is opposite with respect to the virtual tension roller rotational axis RA, is mounted on the frame part 30 ain the same manner as the longitudinal end shown in FIGS. 2 and 3 is mounted on the frame part 30 b. The mounting of the tensioning deflection roller 36 on the device frame 30 is mirror-symmetrical with respect to an axis of symmetry orthogonal to the virtual tensioning roller axis of rotation RA. In the illustrated exemplary embodiment with a virtual tension roller axis of rotation RA arranged equidistantly from the virtual rod axes VS 1 and VS 2, the mounting of the tension deflection roller 36 on the device frame 30 is also mirror-symmetrical with respect to an axis of symmetry containing the tension roller axis of rotation RA and parallel to the virtual rod axes VS 1 and VS 2.

Claims

Stretchable belt conveyor device (24, 26) for conveying mineral material, wherein the stretchable belt conveyor device (24, 26) comprises: - a device frame (30), - a first and a second deflection roller (36), which are each supported by the device frame (30), wherein each deflection roller (36) of the first and the second deflection roller (36) is rotatable about a virtual roller rotation axis (RA) extending transversely to the local conveying direction (FD), - a conveyor belt (32) continuously revolving about the first and the second deflection roller (36), - a bearing block arrangement (61) with a first (60) and a second bearing block, which rotatably support a deflection roller (36) of the first and the second deflection roller (36) as a stretching deflection roller (36) about its virtual stretching roller rotation axis (RA), wherein the first bearing block (60) and the second bearing block are arranged at a distance from one another along the virtual tension roller axis of rotation (RA), and - a clamping device (34) for displacing the tension deflection roller (36) relative to the device frame (30) along a displacement path (VB) which runs transversely to the virtual roller axis of rotation (RA) of the tension deflection roller (36), wherein the clamping device (34) has a threaded rod arrangement (38) with at least one threaded rod (40, 42) for displacing the bearing block arrangement (61), characterized in that, the threaded rod arrangement (38) has at least one first threaded rod (40) extending along a virtual first rod axis (VS1) with a first adjusting nut (64) supported in screw engagement by the first threaded rod (40) in each case and at least one second threaded rod (42) extending along a virtual second rod axis (VS2) with a second adjusting nut (66) supported in screw engagement by the second threaded rod (42) in each case, wherein the at least one first threaded rod (40) is fixed immovably on a structure comprising the device frame (30) and the first bearing block (60) as a first fixed structure (58) relative to the first fixed structure (58) in translation along the virtual first rod axis (VS1), wherein the respective other structure of the device frame (30) and the first bearing block (60) as a first supporting structure (68) is physically supported in the direction of the first fixed structure (58) by the at least one first adjusting nut (64), wherein the at least one second threaded rod (42) is fixed on a structure of the device frame (30) and the first bearing block (60) as a second fixed structure (58) such that it cannot move translationally along the virtual second rod axis (VS2) relative to the second fixed structure (58), wherein the respective other structure of the device frame (30) and the first bearing block (60) as a second supporting structure (68) is physically supported in the direction of the second fixed structure (58) by the at least one second adjusting nut.Clampable belt conveying device (24, 26) according to claim 1, characterised in that the first fixed structure (58) is also the second fixed structure (58)Clampable belt conveying device (24, 26) according to claim 1 or 2, characterised in that the first fixed structure (58) and / or the second fixed structure (58) is the device frame (30).Clampable belt conveying device (24, 26) according to one of the preceding claims, characterized in that the first threaded rod (40) passes through a first fastening formation (46) of the first fixed structure (58), wherein the first fastening formation (46) is clamped between two fixed-structure-side clamping formations (44b, 50) connected to the first threaded rod (40), or / and in that the second threaded rod (42) passes through a second fastening formation (46) of the second fixed structure (58), wherein the second fastening formation (46) is clamped between two fixed-structure-side clamping formations (54) connected to the second threaded rod (42).Clampable belt conveying device (24, 26) according to one of the preceding claims, characterized in that the at least one first threaded rod (40) is arranged such that it cannot move relative to the first fixed structure (58) and / or relative to the first supporting structure (68) rotationally about the virtual first rod axis (VS1), or / and in that the at least one second threaded rod (42) is arranged such that it cannot move relative to the second fixed structure (58) and / or relative to the second supporting structure (68) rotationally about the virtual second rod axis (VS2).Clampable belt conveying device (24, 26) according to one of the preceding claims, characterized in that the at least one first threaded rod (40) protrudes into at least one first receiving opening of the first supporting structure (68), and / or in that the at least one second threaded rod (42) protrudes into at least one second receiving opening of the second supporting structure (68).Clampable belt conveying device (24, 26) according to claim 6, characterised in that the at least one first threaded rod (40) passes through a first holding formation (60a) of the first supporting structure (68) having the at least one first receiving opening, wherein the first holding formation (60a) is clamped between two clamping formations (64, 72) on the supporting structure side connected to the at least one first threaded rod (40), and / or in that the at least one second threaded rod (42) passes through a second holding formation (60b) of the second supporting structure (68) having the at least one second receiving opening, wherein the second holding formation (60b) is clamped between two clamping formations (66, 74) on the supporting structure side connected to the at least one second threaded rod (42).Clampable belt conveying device (24, 26) according to claim 7, characterised in that one of the clamping formations (64, 72) on the support structure side connected to the first threaded rod (40) is the first adjusting nut (64) and / or in that one of the clamping formations (66, 74) on the support structure side connected to the second threaded rod (42) is the second adjusting nut (66).Clampable belt conveying device (24, 26) according to one of the preceding claims, characterized in that at least one rigid first intermediate piece (70) is arranged between the first adjusting nut (64) and the first supporting structure (68), and / or in that at least one rigid second intermediate piece (70) is arranged between the second adjusting nut (66) and the first supporting structure (68).Stretchable belt conveyor (24, 26) according to any of the preceding claims, characterized in that the virtual first rod axis (VS1) and the virtual second rod axis (VS2) enclose an angle of not more than 15°.Tensionable belt conveying device (24, 26) according to one of the preceding claims, characterized in that the at least one first threaded rod (40) and the at least one second threaded rod (42) are arranged in such a way that the elongated imaginary virtual tension roller axis of rotation (RA) runs through between the elongated imaginary virtual rod axes (VS1, VS2) of the first (40) and of the second threaded rod (42).Tensionable belt conveying device (24, 26) according to one of the preceding claims, characterized in that the first bearing block (60) is positioned relative to the device frame (30) only by the components mentioned in at least one of the preceding claims.The clampable belt conveyor device (24, 26) according to any one of the preceding claims, characterized in that the threaded rod arrangement (34) has at least one third threaded rod extending along a virtual third rod axis, each with a third adjusting nut carried by the at least one third threaded rod in screw engagement, and at least one fourth threaded rod extending along a virtual fourth rod axis, each with a fourth adjusting nut carried by the at least one fourth threaded rod in screw engagement, wherein the at least one third threaded rod is immovably fixed in translation along the virtual third rod axis on a structure of device frame (30) and second bearing block as a third fixed structure, wherein the respective other structure of device frame (30) and second bearing block is physically supported as a third support structure in the direction of the third fixed structure by the at least one third adjusting nut, wherein the at least one fourth threaded rod is fixed on a structure made up of the device frame (30) and the second bearing block (60) as a fourth fixed structure in a translatory manner such that it cannot move along the virtual fourth rod axis, wherein the respective other structure made up of the device frame (30) and the second bearing block as a fourth supporting structure is physically supported in the direction of the fourth fixed structure by the at least one fourth adjusting nut.Clampable belt conveying device (24, 26) according to claim 13, characterised in that the statements made in at least one of claims 2 to 12 regarding the at least one first threaded rod (40) and the first bearing block (60) also apply to the at least one third threaded rod and the second bearing block, and / or in that the statements made in at least one of claims 2 to 11 regarding the at least one second threaded rod (42) and the first bearing block (60) also apply to the at least one fourth threaded rod and the second bearing block.Processing device (10), in particular self-propelled processing device, for the comminution and / or sorting processing of mineral material, comprising a material feed (14), at least one comminution device (20) and / or at least one sorting device (18, 22) and at least one stretchable belt conveying device (24, 26) according to one of the preceding claims.

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