JP2016130169A - Modulated carrier roller device, belt conveyor device and modulated carrier roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a modulated carrier roller device capable of preventing a carrier roller from being damaged even when an object to be carried falls down from a conveyor belt by providing a prescribed outer clearance between an outer side face of the carrier roller and a carrier stand.SOLUTION: The modulated carrier roller device maintains the existing value of an inner clearance S1 between a support face of an inclination center axis 7 of an inner carrier stand and an inner side face 5b of a modulated carrier roller, sets an outer clearance S2 between a support face of the inclination center axis 7 of an outer carrier stand and an outer side face 5a of the modulated carrier roller to an outer clearance slightly larger than the diameter of an object to be carried, and makes the outer clearance S2 larger than the inner clearance S1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a belt conveyor device that conveys earth and sand, crushed stone, etc., and a variable length carrier roller device in a belt conveyor device that can prevent the carrier roller from being damaged even when a conveyed object falls from the conveyor belt. The present invention relates to a belt conveyor device using a belt and a variable carrier roller.

  Conventionally (see FIG. 8), there is a trough-type inclined carrier roller device 30 that includes a horizontal carrier roller 17 and a pair of inclined carrier rollers 21 and 21 that are disposed on the left and right sides of the roller 17 and are inclined in opposite directions. In this type of trough-type carrier roller device 30, a distance of about 5 mm is provided between the inner side surface of the inclined carrier roller 21 and the inner carrier stand 19, and between the outer side surface of the inclined carrier roller 21 and the outer carrier stand 22. Although S is provided, the object to be transported that has fallen into the gap of the separation distance S may be sandwiched between the outer carrier stand 22 and the carrier roller 21, and the side surface or the bearing of the carrier roller 21 may be damaged.

  Therefore, a pair of low wear resistance is provided in the space between the outer side surface of the inclined carrier roller and the carrier stand in order to prevent generation of dust due to spillage of the conveyed object from the conveyor belt, damage to the side surface of the carrier roller, etc. There has been proposed a technique in which resin-coated plates are fixedly arranged along a trough angle and the lower surfaces of both end portions of a conveyor belt run on these low-abrasion resin-coated plates (Patent Document 1).

  In addition, in order to prevent fine powder of the conveyed object from entering the outer bearing of the inclined carrier roller, a donut disk having a constant width is fixed to the outer surface of the inclined carrier roller, and thereby the donut disk and the carrier are fixed. There has been proposed a technique that prevents the fine powder of the conveyed object from entering the bearing of the inclined carrier roller by further reducing the distance from the stand (for example, S = 1 mm to 2 mm). (Patent Document 2).

Japanese Patent Laid-Open No. 10-329919 Japanese Utility Model Publication No. 7-38028

  By the way, the apparatus of the above-mentioned Patent Document 1 has a complicated installation structure on the back side of the low-abrasion resin-coated plate, so that an object to be conveyed being conveyed by the conveyor belt is belted from the belt outer edge by meandering of the conveyor belt. When moving outside and dropping from the distance between the outer edge of the low-abrasion resin-coated plate and the carrier stand, the object to be transported is between the lower surface of the low-abrasive resin-coated plate and the carrier stand, or the low-abrasion resin coating. There is a risk of damaging the side surface of the carrier roller or the like by being sandwiched between the lower surface of the plate and the side surface of the carrier roller.

  The apparatus of Patent Document 2 can prevent the conveyed object from entering between the donut disk and the carrier stand if the object to be conveyed is larger than the small gap. There is still a risk that the small gap S will be caught and pinched, thereby damaging the side surface of the carrier roller.

  The present invention has been made in view of the above-described conventional problems. By providing a predetermined outer separation distance between the outer side surface of the carrier roller and the outer carrier stand, the object to be conveyed is dropped from the conveyor belt. It is an object of the present invention to provide a variable length carrier roller device, a belt conveyor device, and a variable length carrier roller in a belt conveyor device that can prevent the carrier roller from being damaged even in the case where there is a problem.

In order to achieve the above object, the present invention
First, an inclined central axis between a pair of inner carrier stands that support both ends of a horizontal central axis of a central horizontal carrier roller and a pair of outer carrier stands located on both outer sides of the pair of inner carrier stands. A variable length carrier roller device having a pair of variable length carrier rollers supported in an inclined state so as not to move in the direction of the inclined central axis, wherein each of the variable length carrier rollers is provided on the inner carrier stand. The inner separation distance between the support surface of the inclined central shaft and the inner side surface of the variable carrier roller maintains an existing value, and the support surface of the inclined central shaft of the outer carrier stand and the variable carrier roller The outer separation distance between the outer side surface and the outer side surface is slightly larger than the diameter of the conveyed object, and the outer separation distance is larger than the inner separation distance. Composed of variable-length carrier rollers and wherein the and those were.

  The support surface of the inner carrier stand can be constituted by, for example, an inclined surface (4 ″), and the support surface of the outer carrier stand can be constituted by, for example, an inclined surface (6 ′). The existing value of the inner separation distance is a conventional inclined carrier. The size of the inner separation distance (S1) of the roller device is, for example, S1 = 5 mm, and the outer separation distance slightly larger than the diameter of the conveyed object is, for example, the outer separation when the diameter L of the conveyed object is 30 mm. The distance S2 can be set to 42 mm By applying the variable length carrier roller device according to the present invention to the belt conveyor device, the outer separation distance can be maintained even if the conveyed product falls off the outer edge of the conveyor belt. Is slightly larger than the diameter of the carrier, so that the dropped transported object can be smoothly dropped downward through the space of the outer separation distance. Side of the damage or the like can be effectively prevented.

  Secondly, each of the pair of variable length carrier rollers is formed so that only the outer housing structure is formed at a position closer to the inner side than the inclined central axis, so that the inclined central axis extends from the outer side surfaces. 2. The variable length carrier roller according to claim 1, wherein the distance to the outer tip is configured to be greater than the distance from each of the inner side surfaces to the inner tip of the inclined central axis. Consists of devices.

  Thirdly, the pair of variable length carrier rollers have notched surfaces on both side surfaces of the inclined central axes, and the notched surfaces are supported by the inner carrier stand and the outer carrier stand. The variable length carrier roller device according to the first or second aspect is configured so as to be immovably supported in the direction of the inclined central axis by being fitted into a groove on the surface.

  With such a configuration, the variable length carrier roller can be rotatably supported while maintaining the above-described outer separation distance.

  Fourth, the outer separation distance is approximately 10% of the conventional inclined carrier roller width when the diameter of the conveyed object is small, and approximately 30 of the conventional inclined carrier roller width when the diameter of the conveyed object is medium. %, When the diameter of the object to be conveyed is large, it is constituted by the variable carrier roller device according to any one of the first to third aspects, which is approximately 60% of the width of the conventional inclined carrier roller.

  The above approximately 10% is, for example, 9.6% (in the case of Example 2 in Table 2, S2 = 20.16 mm) to 13% (in the case of Example 2, S2 = 27.3 mm), and the above approximately 30% is For example, 29% (S2 = 60.9 mm in the case of Example 2 in Table 2) to 32% (S2 = 67.2 mm in the case of Example 2), and the above 60% is 58% (Table 2). In the case of Example 2, S2 = 121.8 mm) to 63% (in the case of Example 2, S2 = 132.3 mm), and the lower limit of the outer separation distance S2 is the diameter of the object to be conveyed. It is preferable to set so as to be slightly larger than L. Further, the outside separation distance (S2) is simply 10% of the conventional inclined carrier roller width when the conveyed object is small, and 30% of the conventional inclined carrier roller width when the conveyed object is inside. When the transported object is large, it can be calculated as 60% of the width of the conventional inclined carrier roller. By configuring in this way, it is possible to easily determine an appropriate outer separation distance according to the size of the object to be conveyed for various conventional carrier roller widths.

  Fifth, a belt conveyor apparatus using the variable carrier roller apparatus according to any one of the first to fourth aspects, wherein one or a plurality of the variable carrier roller apparatuses are removed from the conveyor belt. It is configured by a belt conveyor device characterized in that it is installed in an area where the fall is likely to occur.

  If comprised in this way, in the area where a to-be-conveyed object will fall easily from a conveyor belt, the belt conveyor apparatus which can prevent effectively damage etc. of a variable length carrier roller can be implement | achieved.

  Sixth, one or a plurality of the above-mentioned variable carrier roller devices are installed between conventional inclined carrier roller devices installed at predetermined intervals along the traveling direction of the belt conveyor. It is comprised by the belt conveyor apparatus of said 5th.

  Seventh, an inclined central axis between a pair of inner carrier stands that support both ends of the horizontal central axis of the central horizontal carrier roller and a pair of outer carrier stands positioned on both outer sides of the pair of inner carrier stands. A variable length carrier roller supported in an inclined state with the variable length carrier roller having notch surfaces on both side surfaces of the inclined central axis, and the notch surfaces are arranged on the inner side. By fitting in the groove of the support surface of the carrier stand and the outer carrier stand, it is supported so as not to move in the direction of the inclined central axis, and the position of the inner side surface of the variable length carrier roller is An inner side separation distance between the support surface of the inclined central axis of the inner carrier stand and the side surface inside the variable length carrier roller is formed at a position where the existing value is an existing side surface. The position is formed at a position where the distance between the support surface of the inclined central axis of the outer carrier stand and the side surface outside the variable length carrier roller is an outer separation distance slightly larger than the diameter of the object to be conveyed, The variable length carrier roller is configured such that the outside separation distance is larger than the inside separation distance.

  The position of the outer side surface of the variable length carrier roller is such that the distance between the support surface of the inclined central axis of the outer carrier stand and the side surface outside the variable length carrier roller is slightly larger than the diameter of the object to be conveyed. The position serving as the distance refers to the position of the outer side surface (5a) where the outer separation distance is S2 = 42 mm when the diameter L of the conveyed object is 30 mm, for example.

  Eighth, the variable length carrier roller is formed such that only the outer housing structure is formed at a position closer to the inner side with respect to the inclined central axis, thereby the outer side surface to the outer tip of the inclined central axis. The distance is configured to be greater than the distance from the inner side surface to the inner tip of the inclined central axis.

  Ninth, the outer separation distance is approximately 10% of the conventional inclined carrier roller width when the diameter of the conveyed object is small, and approximately 30 of the conventional inclined carrier roller width when the diameter of the conveyed object is medium. %, When the diameter of the object to be conveyed is large, it is constituted by the variable carrier roller according to the seventh or eighth aspect which is approximately 60% of the width of the conventional inclined carrier roller.

  According to the present invention, even if the object to be transported falls off from the outer edge of the conveyor belt, the dropped object to be transported can be smoothly dropped downward through the space of the outer separation distance. It is possible to effectively prevent side damage and the like and to greatly extend the life of the variable length carrier roller.

  In addition, for various conventional inclined carrier roller widths, an appropriate outer separation distance can be easily determined according to the size of the object to be conveyed.

  Further, in the belt conveyor device, it is possible to effectively prevent damage or the like of the variable length carrier roller at a place where the object to be transported easily falls from the conveyor belt.

It is a front view of the variable length carrier roller device concerning the present invention. It is a partial cross section front view of the variable length carrier roller used for an apparatus same as the above. (A) is a perspective view of an inner carrier stand of the same apparatus, (b) is a perspective view of an outer carrier stand of the same apparatus, (c) is a side view of a support surface of the carrier stand of the same apparatus, and (d) is an upper apparatus. It is a cross-sectional view of the support surface of the carrier stand. FIG. 4 is a partially omitted front view of the apparatus, wherein (a) shows a case where the conveyed object is small, (b) shows a case where the conveyed object is inside, and (c) shows a case where the conveyed object is large. (A), (b) is a schematic top view of the belt conveyor apparatus to which the apparatus same as the above is applied. (A), (b) is a schematic top view of the belt conveyor apparatus to which the apparatus same as the above is applied. It is a partially-omission front view of the same apparatus which shows the state which is conveying the to-be-conveyed object by the same apparatus. It is a front view of a conventional inclined carrier roller device.

  Hereinafter, the variable carrier roller and the variable carrier roller device in the belt conveyor according to the present invention will be described in detail.

  FIG. 1 is a front view of the variable carrier roller device 1, and the inner separation distance S 1 between the inner side surfaces 5 b and 5 b of the inclined carrier rollers (variable carrier rollers) 5 and 5 and the inner carrier stands 4 and 4. S1 has the same length as that of the conventional apparatus of FIG. 8 (that is, the existing value, for example, S1 = 5 mm), but the outer side surfaces 5a, 5a of the inclined carrier rollers 5, 5 and the outer carrier stands 6, 6 The outer separation distances S2 and S2 are formed so as to be slightly larger than the diameter L of the conveyed object (S1 <S2, S2 ≧ L) according to the size (diameter L) of the conveyed object. Yes (see FIG. 2).

  The inclined center shafts 7 of the inclined carrier rollers 5 and 5 are shafts having a circular cross section, but the side surfaces of both ends thereof are notched surfaces 7 ′ cut parallel to each other in a direction perpendicular to the central axis P. 7 'is provided (refer FIG.2 (b)). Then, as shown in FIGS. 3A to 3D, a U-shaped bearing in which the notch surface 7 ′ inside the inclined central shaft 7 is provided on the inclined surface (support surface) 4 ″ of the inner carrier stand 4 is provided. U-shaped bearing grooves (grooves) 6 a each fitted in the grooves (grooves) 4 b and provided with an outer notch surface 7 ′ of the inclined central shaft 7 on the inclined surface (support surface) 6 ′ of the outer carrier stand 6. To fit.

  As a result, the inclined central shaft 7 is restricted from rotating relative to the inner and outer carrier stands 4 and 6 and the inclined carrier rollers 5 and 5 are restricted so as not to move in the direction of the inclined central axis 7 (the direction of the central axis P). The inclined carrier roller 5 can be supported on the inner and outer carrier stands 4 and 6 in an inclined state.

  As described above, according to the present invention, the inner carrier distance 5 between the inner side surface 5b of the inclined carrier roller 5 and the carrier stand 4 is maintained at the same value (existing value) as before, while the inclined carrier roller 5 is maintained. This is characterized in that the outer separation distance S2 between the outer side surface 5a and the carrier stand 6 is formed to be large (for example, S2 = 35 mm).

  In the following description, in the inclined carrier rollers 5 and 5 of FIG. 1, the central inner carrier stands 4 and 4 side is defined as “inner side”, and the outer carrier stand 6 and 6 sides on both sides are defined as “outer side”.

  Further, in the inclined carrier rollers 5, 5 as shown in FIG. 1, only the outer separation distances S2, S2 between the outer side surfaces 5a, 5a and the carrier stands 6, 6 are larger than the inner separation distances S1, S1. The inclined carrier rollers 5 and 5 according to the present invention are referred to as “variable carrier rollers”, and the variable carrier rollers 5 and 5 are used as the right and left inclined carrier rollers, so that the left and right inclined carrier rollers 5 and 5 are used. The trough-type carrier roller device 1 shown in FIG. 1 having outer separation distances S2 and S2 larger than the inner separation distances S1 and S1 between the outer side surfaces 5a and 5a and the outer carrier stands 6 and 6, This is called “variable length carrier roller device”.

  In contrast to this, the conventional inclined carrier roller device 30 shown in FIG. 8 (the inner and outer separation distances S of the inclined carrier rollers 21 and 21 are the same width, and the separation distance S is 5 mm or 4 mm of the conventional type. The conventional inclined carrier roller 21 having the same inner and outer separation distances S shown in FIG. 8 used in the conventional inclined carrier roller device is used as a “conventional inclined carrier roller device”. It is called “conventional inclined carrier roller”.

Hereinafter, the variable carrier roller device 1 will be described in detail.
In FIG. 1, 1 'is a machine frame orthogonal to the conveyor traveling direction, and a pair of inner carrier stands 4 for horizontally supporting a central horizontal carrier roller 3 at two central portions of the machine frame 1'. 4 is formed upright, and outer carrier stands 6 and 6 for supporting the inclined variable length carrier rollers 5 and 5 are formed upright at both ends of the machine casing 1.

  The inner carrier stands 4 and 4 (see FIG. 3A) are U-shaped bearings for supporting both ends of the horizontal central shaft 2 of the central horizontal carrier roller 3 on each inner vertical surface 4 ′. Grooves 4a and 4a are formed at the same height, and the central horizontal carrier roller 3 supports both ends of the horizontal central shaft 2 in the bearing grooves 4a and 4a, thereby the machine frame 1 '. The center part is supported horizontally and freely rotatable.

  On both outer sides of the inner carrier stands 4 and 4 are formed inclined surfaces (support surfaces) 4 ″ inclined from the vertical surface by the same angle θ1 as the trough angle θ1 of the variable length carrier rollers 5 and 5. U-shaped bearing grooves for supporting both inner ends (notch surfaces 7 ', 7') of the inclined central shafts 7, 7 of the variable length carrier rollers 5, 5 on the inclined surfaces 4 ", 4". (Grooves) 4b and 4b are formed.

  The outer carrier stands 6 and 6 (see FIG. 3 (b)) are erected symmetrically on the machine frame 1 'on both outer sides of the inner carrier stands 4 and 4, and each upper end portion is directed inward. Are inclined to form inclined surfaces (support surfaces) 6 ′ and 6 ′ parallel to the inclined surfaces 4 ″ and 4 ″, and the variable length carrier rollers 5 and 5 are formed on the inclined surfaces 6 ′ and 6 ′. U-shaped bearing grooves (grooves) 6a and 6a for supporting both outer end portions (notched surfaces 7 'and 7') of the central shafts 7 and 7 are formed.

  The variable length carrier rollers 5 and 5 have the notched surfaces 7 'at the inner ends of the inclined central shafts 7 and 7 fitted in the bearing grooves 4b and 4b of the inner carrier stands 4 and 4, respectively. FIG. 1 shows the cutout surface 7 ′ of the outer end portions of the outer carriers 7 and 7 by fitting them into the bearing grooves 6 a and 6 a of the outer carrier stands 6 and 6 (see FIGS. 3C and 3D). As described above, the central horizontal carrier roller 3 is rotatably supported on both sides of the central horizontal carrier roller 3 while being inclined at the trough angle θ1.

  At this time, the opposing edges of the bearing grooves 4b, 4b are in contact with the both notched surfaces 7 ', 7' of the inner inclined central shaft 7, and the both notched surfaces 7 ', 7 'comes into contact with the opposing edges of the bearing grooves 6a, 6a, whereby the tilted central shaft 7 is restricted from rotation (see FIGS. 3C and 3D), and movement in the direction of the tilted central axis 7 is also restricted. Is done. Therefore, the variable length carrier rollers 5 and 5 have the inner separation distance S1 formed on the inner side and the outer separation distance S2 formed on the outer side when mounted on the inner and outer carrier stands 4 and 6, respectively. Is supported so as to be able to rotate in an inclined state with a constant maintained.

  In this manner, the variable length carrier rollers 5 and 5 are mounted on the inner and outer carrier stands 4 and 6 shown in FIG. Is formed between the outer side surface 5a of the variable length carrier rollers 5 and 5 and the inclined surface 6 'of the carrier stand 6. An outer separation distance S2 (S2 = 35 mm in the case of FIG. 1) larger than the inner separation distance S1 is provided, and is configured to be able to rotate in an inclined state while maintaining these inner and outer separation distances S1 and S2. .

  This outside separation distance S2 is determined mainly according to the size (diameter L) of the conveyed object to be conveyed, and is formed slightly larger than the diameter L of the conveyed object as will be described later. The inner separation distance S1 as an existing value determined by the JIS standard is slightly different depending on the conventional inclined carrier roller width C, the frame width F, etc., but here, S1 = 5 mm as an example.

Hereinafter, a specific structure of the variable length carrier roller 5 will be described.
The variable length carrier roller 5 has the structure shown in FIG. 2, and receives an inclined central shaft 7 passing through the center of the cylindrical portion 9 by annular housings 8, 8 fitted to both ends of the cylindrical portion 9. Thus, the housings 8 and 8 and the cylindrical portion 9 are rotatably supported with respect to the inclined central shaft 7. 2 shows a specific configuration of only the right housing 8, the left housing 8 has the same symmetrical structure as the right housing 8. Therefore, the left housing 8 is indicated by a two-dot chain line. Outline.

  Specifically, the variable length carrier roller 5 includes a ball bearing 10 that rotatably supports the housing 8 side (cylindrical portion 9 side) with respect to the central shaft 7, and ends of the ball bearing 10 and the cylindrical portion 9. A substantially annular housing 8 that is located between the inner peripheral portion of the housing 8 and the ball bearing 10. The dust-proof labyrinth 12 is provided between the inner peripheral portion of the housing 8 and the ball bearing 10. It is configured.

  As shown in FIG. 2, the housing 8 has a small cylindrical portion 8 a formed on the inner peripheral side, the ball bearing 10 and the labyrinth 12 are disposed inside the small cylindrical portion 8 a, and the small cylinder A disc portion 8b extending radially from the outer periphery of the portion 8a is provided, and an annular rib 8c bent in the axial direction is provided on the outermost periphery of the disc portion 8b. The inner peripheral surface of the end portion of the cylindrical portion 9 is fitted and mounted. An annular flat surface 8d is formed on the outside (or inside) of the rib 8c.

  Here, the cylindrical portion 9 is rotatably supported with respect to the inclined central shaft 7, and structures constituting both side surfaces 5 a and 5 b of the variable length carrier roller 5, that is, the housing 8 and the ball bearing 10. The structure composed of the labyrinth 12 and springs 14 and 15 described later is referred to as a “housing structure”.

  An annular cover 13 is mounted between the inner peripheral edge of the housing 8 on the inclined central axis 7 side and the outer peripheral edge of the disk portion 8 b of the housing 8. The cover 13 is fitted and mounted at its inner peripheral edge to the inclined central shaft 7, its outer peripheral edge is close to the inner periphery of the annular rib 8 c of the housing 8, and its annular flat surface 13 a is It arrange | positions so that the substantially whole region of the disc part 8b of the housing 8 may be coat | covered.

  As a result, the disk portion 8b of the housing 8 is substantially entirely covered by the annular flat surface 13a of the cover 13, so that dust or the like does not enter the disk portion 8b of the housing 8 as much as possible. .

  The position of the annular flat surface 13 a of the cover 13 is configured to substantially coincide with the annular flat surface 8 d of the annular rib 8 c of the housing 8, and the annular flat surface 8 d of the rib 8 c of the housing 8. The annular flat surface 13a of the cover 13 is configured to be a flush surface.

  Therefore, the annular flat surface 13a of the inner cover 13 of the variable length carrier roller 5 or the flat surface 8d of the annular flat surface 8d of the housing 8 is referred to as “the inner side surface 5b of the variable length carrier roller 5”. The annular flat surface 13a of the outer cover 13 of the variable length carrier roller 5 or the flat surface 8d of the annular flat surface 8d of the housing 8 is referred to as “the outer side surface 5a of the variable length carrier roller 5”.

  In FIG. 2A, reference numerals 14 and 15 denote ring-shaped springs fitted in grooves formed on the outer periphery of the inclined central shaft 7, and the ball bearing 10 and the rabbi ring 12, and thus the housing 8 and the above. The cover 13 is positioned.

  As described above, the position of the inner side surface 5 b of the variable length carrier roller 5 is such that the support surface (inclined surface 4 ″) of the inclined central shaft 7 of the inner carrier stand 4 and the inner side of the variable length carrier roller 5 are the above. The inner side separation distance S1 with the side surface 5b is formed at a position where the existing value (for example, S1 = 5 mm) is formed, and the position of the outer side surface 5a is the support surface of the inclined central shaft 7 of the outer carrier stand 6 ( The distance between the inclined surface 6 ′) and the outer side surface 5a of the variable length carrier roller 5 is formed at a position where the outer separation distance S2 is slightly larger than the diameter L of the conveyed object, and is larger than the inner separation distance S1. The outer separation distance S2 is configured to be large.

  Accordingly, in the variable length carrier roller 5 (see FIG. 2A), only the housing structure including the housing 8 on the outer side with respect to the inclined central axis 7 is formed at an inner position, and the inner housing structure is formed. Is formed at an existing position so that the distance M2 from the outer side surface 5a to the outer tip of the inclined central shaft 7 is the distance from the inner side surface 5b to the inner tip of the inclined central shaft 7. It is configured to be larger than M1 (M2> M1). Therefore, the variable length carrier roller 5 has a left-right asymmetric shape with respect to the inclined central axis 7.

  As shown in FIG. 1, the present invention is characterized in that the left and right variable carrier rollers 5 and 5 of the variable carrier roller device 1 have side surfaces 5 a and 5 a on both outer sides of the variable carrier rollers 5 and 5. The outer separation distance S2, slightly larger than the diameter L corresponding to the size (diameter L) of the object to be conveyed, between the corresponding support surfaces (inclined surfaces 6 ', 6') of the carrier stands 6, 6 S2 is provided at each point (see FIGS. 4A to 4C).

  The outer separation distances S2 and S2 are configured to be slightly larger than the diameter L of the conveyed object. Accordingly, the variable length carrier roller device 1 is moved from the conveyor belt 16 in the belt conveyor apparatus 20 to the conveyed object. Even if the object to be transported falls from the outer edge of the conveyor belt 16 by being installed in an easy place (for example, area E in FIG. 5B), the object to be transported is the side surface 5a on the outside of the variable length carrier roller 5. And the carrier stand 6 are dropped and dropped, so that damage to the outer side surface 5a (housing 8, bearing cover 13) of the variable length carrier roller 5 can be prevented.

  Next, a case where the variable carrier roller device 1 is applied to the belt conveyor device 20 will be described.

  5 (a) and 5 (b) schematically show a belt conveyor device 20 to which the variable length carrier roller device 1 according to the present invention is applied. In the figure, the arrow A indicates the direction of travel of the conveyor belt 16, 31 indicates the frame of the belt conveyor device 20, and the conventional inclined carrier roller device 30 is shown in a simplified shape with a white rectangle. The carrier roller device 1 is shown in a simplified form with hatched rectangles.

  As shown in the figure, the conventional inclined carrier roller device 30 is provided at predetermined intervals along the frame 31 of the belt conveyor device 20, for example.

  The variable length carrier roller device 1 according to the present invention investigates in advance the place where the object to be transported is likely to fall in the belt conveyor device 20, and in the place where the material to be transported is likely to fall, the conventional type The variable length carrier roller device 1 is installed in place of the inclined carrier roller device 30. In addition, after the belt conveyor device 20 is operated, when a place where the object to be transported falls later is found, the variable length carrier roller device 1 is installed instead of the conventional inclined carrier roller device 30 at the place. To do.

  For example, as shown in FIG. 5A, one or two conventional inclined carrier roller devices 30 are arranged so that the conventional inclined carrier roller devices 30 and 30 are positioned before and after that. Alternatively, as shown in FIG. 4B, in the belt conveyor device 20, several variable length carrier roller devices 1 are arranged at regular intervals in an area E along the traveling direction A where the conveyed object of the conveyor belt easily falls. Install continuously every time. Of course, one conventional inclined carrier roller device 30 may be replaced with one variable length carrier roller device 1.

  That is, one or a plurality of the above-described variable carrier roller devices 1 are installed along the traveling direction of the conveyor belt 16 in the area E where the object to be conveyed is likely to fall from the conveyor belt 16 or the belt conveyor device 20. In place of the conventional inclined carrier roller device 30, one or a plurality of the above-described variable carrier roller devices 1 are installed between the conventional inclined carrier roller devices 30 installed along the traveling direction.

  Various factors can be considered for the fall of the transported object from the conveyor belt 16. For example, when the transported object falls depending on the placement position of the transported object on the conveyor belt 16, the travel speed of the conveyor belt 16 is reduced. When the object to be transported falls due to speeding up or speed fluctuation, etc., or when the object to be transported falls due to meandering, eccentricity, etc. of the conveyor belt 16, the shape of the path of the belt conveyor device, for example, where the belt conveyor device curves or curves Various other factors are conceivable, such as when the object to be transported falls.

  As described above, as one of the places where the transported object is likely to fall, a point where the frame 31 of the belt conveyor device 20 curves can be considered as shown in FIGS. When the object to be transported falls in such a curve, as shown in the figure, one or a plurality of the variable length carrier roller devices 1 can be installed in an area where the conveyor belt 16 curves.

  Table 1 shows the value of the outer separation distance S2 for each diameter (small, medium, large) of the conveyed object with respect to the conventional inclined carrier roller width C (Examples 1 to 4). In Table 1, the conveyor belt width, the conventional inclined carrier roller width C, the frame width F, and the inner separation distance S1 in Examples 1 to 4 are the existing values (dimensions) defined by the JIS standard of the belt conveyor. Yes, for each existing value, assuming a small, medium and large diameter L of the object to be conveyed, the value of the outer separation distance S2 for each assumed value and the width C ′ of the variable carrier roller It is described. The frame width F is a distance between the inclined surface 4 ″ of the inner carrier stand 4 and the inclined surface 6 ′ of the outer carrier stand 6, as shown in FIGS.

本実施形態では、被搬送物は石炭、土砂等の砕石であるが、通常、ベルトコンベア装置２０の前段にて振動篩等にかけられて、その直径の略揃った大きさの砕石をベルトコンベア装置２０にて搬送する。ここでは、一例として被搬送物として砕石の塊の直径Ｌが大、中、小のものを考え、小の塊の直径Ｌが３０ｍｍ、中の塊の直径Ｌが１２０ｍｍ、大の塊の直径Ｌが２４０ｍｍとして、これらの直径Ｌが略揃った塊を搬送する場合を考える（表１の実施例３の場合）。

In the present embodiment, the object to be transported is crushed stone such as coal, earth and sand, etc., but is usually put on a vibrating screen or the like at the front stage of the belt conveyor device 20 and the crushed stone having a substantially uniform diameter is applied to the belt conveyor device. 20 to transport. Here, as an example, a crushed stone lump having a large, medium, or small diameter L is considered as an object to be conveyed. Is assumed to be 240 mm, and a lump having substantially the same diameter L is conveyed (in the case of Example 3 in Table 1).

  A standard type conventional inclined carrier roller apparatus based on the JIS standard is shown in FIG. The conventional inclined carrier roller device 30 has a conveyor belt width of 1200 mm in a horizontal state, a frame width F = 430 mm, a carrier width C of the conventional inclined carrier roller C = 420 mm, both side surfaces of the carrier rollers 5 and 5, and the carrier frame 6. The inner and outer separation distances S are 5 mm each, and this conventional carrier roller device 30 will be described below as a standard type (see Example 3 in Table 1 where the belt width is 1200 mm).

  FIG. 4A shows the type of Example 3 in Table 1 (conveyor belt width is 1200 mm, conventional inclined carrier roller width C is 420 mm, frame width F is 430 mm), and the diameter of the object to be conveyed. The variable length carrier roller device 1 when L is 30 mm (small) is shown. Although the inner separation distance S1 between the inner side surface 5b of the variable length carrier roller 5 and the carrier stand 4 of the third embodiment is 5 mm (standard value), the outer side surface 5a of the variable length carrier roller 5 and the carrier stand 6, the outer separation distance S <b> 2 is slightly larger than the diameter L of the conveyed object S <b> 2 = 42 mm (S <b> 2 = conventional inclined carrier roller width C × 0.1), and the width C ′ of the variable length carrier roller 5 = 383 mm).

  4 shows only the right half of the variable length carrier roller device toward the paper surface, the left half of the paper surface has a symmetrical structure, and the left side surface of the variable length carrier roller 5 is outside. A gap having an outer separation distance S2 = 42 mm is formed between 5a and the left carrier stand 6. The same applies to FIGS. 4B and 4C.

  Since the width of the conveyor belt 16 to which the variable carrier roller device 1 is applied is 1200 mm, which is the same as the standard type of the third embodiment, both end edges 16a of the conveyor belt 16 are located in the range of the outer separation distance S2. And reaches the position of the inner inclined surface 6 ′ of the outer carrier stand 6. Further, as shown in FIGS. 5A and 5B, since the conventional carrier roller device 30 is positioned before and after the variable length carrier roller device 1 in the belt conveyor device 20, the conveyor belt 16 is normally operated. When traveling, as shown in FIG. 4A, the both end edges 16a reach the position of the inclined surface 6 ′ of the outer carrier stand 6, and the edge 16b of the conveyor belt 16 moves to the outer separation distance S2. Drive in a state where the space is closed.

  FIG. 4B shows the type of Example 3 in Table 1 (conveyor belt width is 1200 mm, conventional inclined carrier roller width C is 420 mm, frame width F is 430 mm), and the diameter of the conveyed object The variable length carrier roller apparatus 1 in case L is 120 mm (medium) is shown. Although the inner separation distance S1 between the inner side surface 5b of the variable length carrier roller 5 and the carrier stand 4 in Example 3 remains 5 mm, the distance between the outer side surface 5a of the variable length carrier roller 5 and the carrier stand 6 remains unchanged. The outer separation distance S2 is slightly larger than the diameter L of the conveyed object S2 = 126 mm (S2 = conventional inclined carrier roller width C × 0.3), and the width C ′ of the variable length carrier roller 5 is 299 mm. It is.

  Since the width of the conveyor belt 16 of the belt conveyor device 20 is 1200 mm, which is the same as that of the standard type, both end edges 16a of the conveyor belt 16 are located in the range of the gap S2, and the inner slope of the outer carrier stand 6 is inclined. It reaches the position of surface 6 '. Further, as shown in FIGS. 5 (a) and 5 (b), since the conventional inclined carrier roller device 30 is positioned before and after the variable length carrier roller device 1 in the belt conveyor device 20, the conveyor belt 16 is normal. 4 (b), the both end edges 16a reach the position of the inclined surface 6 'of the carrier stand 6, and the edge 16b of the conveyor belt 16 moves to the outer separation distance S2. Drive in a state where the space is closed.

  FIG. 4C shows the type of Example 3 in Table 1 (conveyor belt width is 1200 mm, conventional inclined carrier roller width C is 420 mm, frame width F is 430 mm), and the diameter of the conveyed object The variable length carrier roller apparatus 1 in the case where is 240 mm (large) is shown. Although the inner separation distance S1 between the inner side surface 5b of the variable length carrier roller 5 and the inner carrier stand 4 in the third embodiment remains 5 mm, the outer side surface 5a of the variable length carrier roller 5 and the carrier stand 6 remain unchanged. The outer separation distance S2 between S 2 and S 2 is slightly larger than the diameter of the object to be conveyed, S 2 = 252 mm (S 2 = conventional inclined carrier roller width C × 0.6), and the width C ′ of the variable length carrier roller 5 is 173 mm. (See Table 1).

  Since the conveyor belt 16 of this variable length carrier roller device 1 is 1200 mm as in the standard type, both end edges 16a of the conveyor belt 16 are located in the range of the outer separation distance S2, and the carrier stand 6 To the position of the inner inclined surface 6 '. Further, as shown in FIGS. 5A and 5B, since the conventional carrier roller device 30 is positioned before and after the variable length carrier roller device 1 in the belt conveyor device 20, the conveyor belt 16 is normally operated. When traveling, as shown in FIG. 4C, both end edges 16a reach the position of the inclined surface 6 'of the carrier stand 6, and the edge 16b of the conveyor belt 16 has the outer separation distance S2. Drive in a state where the space is blocked.

  In the case of FIG. 4C, the outer separation distance S2 is ½ or more of the frame width F. Therefore, the edge 16b of the conveyor belt 16 may be bent slightly downward.

  Since the variable length carrier roller device according to the present invention is configured as described above, the function of the present invention will be described next.

In the present embodiment, a case where the variable carrier roller device 1 (S2 = 126 mm) shown in FIG. 4B is used in the belt conveyor device of FIG. 5B will be described (see FIG. 7).
That is, in the belt conveyor device 20, the variable length carrier roller device 1 shown in FIGS. 4B and 7 is installed in an area E where the conveyed object is likely to fall from the conveyor belt 16. In the case of the present embodiment, as shown in FIG. 5B, in the area E where the object to be conveyed is likely to fall from the conveyor belt 16, in place of the three conventional inclined carrier roller devices 30, variable length carrier rollers Three devices 1 are continuously installed along the conveyor traveling direction at regular intervals.

  Moreover, in the said belt conveyor apparatus 20, the crushed stone G whose diameter L is 120 mm shall be conveyed as a to-be-conveyed object. That is, a vibrating sieve (not shown) is present at the start position of the belt conveyor device 20, and the crushed stone G having a diameter L = 120 mm is dropped and supplied onto the conveyor belt 16 of the belt conveyor device 20 by the vibrating sieve. Further, the crushed stone G is conveyed in the direction of arrow A by the conveyor belt 16 by causing the conveyor belt 16 to advance in the direction of arrow A.

  Here, in the area E, for some reason that the crushed stone G falls from the conveyor belt 16, for example, the conveyor belt 16 slides (meanders) in B and B ′ perpendicular to the traveling direction A. (See FIG. 7).

  At the position of the variable length carrier roller device 1, due to the sliding (meandering) of the conveyor belt 16, the edge 16 a of the conveyor belt 16 is indicated by an arrow along the inclination of the cylindrical portion 9 of the variable length carrier roller 5. Slide in the B and B 'directions. The sliding runout width of the end edge 16a of the conveyor belt 16 corresponds to the sliding width of the conveyor belt 16, but from the position a1 corresponding to the inclined surface 6 ′ of the outer carrier stand 6. It is assumed that the slider slides in the directions of arrows B and B ′ within the range of the position a2 corresponding to the outer side surface 5a of the variable length carrier roller 5.

  When the conveyor belt 16 slides as described above, as shown in FIG. 7, the crushed stone G, which is the object to be conveyed, also acts on the conveyor belt 16 in the directions of arrows B and B ′, and a part of the crushed stone G When the end portion 16a of the conveyor belt 16 moves in the direction of arrow B, the end portion 16a moves to the vicinity of the position a2, so that the end portion 16a and the outer carrier stand 6 are moved. As a result, a crushed stone G that has moved to the vicinity of both ends of the conveyor belt 16 falls from the space of the outer separation distance S2 as possible (FIG. 7). Crushed stone G ').

  Further, the end 16a is slightly bent downward due to the elasticity of the conveyor belt 16, and the crushed stone G that has moved to both ends of the conveyor belt 16 may fall below the end 16a (see FIG. 7 (see the end portion 16a bent downward).

  At this time, since the outside separation distance S2 is larger than the diameter L (= 120 mm) of the crushed stone G (S2 = 126 mm), the crushed stone G smoothly passes the outside separation distance S2 and falls downward. The crushed stone G is sandwiched between the outer side surface 5a of the variable carrier roller 5 and the inclined surface 6 'of the carrier stand 6, and the side surface 5a of the carrier roller 5 and the housing 8 are not damaged. . Further, when the crushed stone G is sandwiched between the outer separation distances S2, smooth rotation of the carrier roller 5 is not hindered.

  In addition, small particles such as dust particles that are smaller than the diameter L that has passed through the sieve or the above-mentioned crushed stone G are smoothly dropped downward from the wide space of the outer separation distance S2, so that the small particles Therefore, the side surface 5a of the variable length carrier roller 5 is not damaged.

  Accordingly, in the belt conveyor device 20, even if some crushed stones G fall downward from the both ends 16 a of the conveyor belt 16 in the area E where the object to be conveyed is likely to drop, the length change of the length change carrier roller device 1. The side surfaces 5a and 5a of the carrier rollers 5 and 5 and the housings 8 and 8 are not damaged, and the crushed stone S can be smoothly conveyed. Therefore, the life of the variable length carrier roller 5 can be greatly extended.

  FIG. 6 is another embodiment showing the installation location of the variable length carrier roller device 1 according to the present invention. As shown in FIG. 6 (a), the belt conveyor device 20 has an arc portion 20a. When the conveyor belt 16 curves along the circular arc portion 20a, the variable length carrier roller device 1 is installed at a point where the curvature of the circular arc portion 20a is the largest, and FIG. When the conveyor belt 16 is curved along the arc portion 20a, the variable length carrier roller device 1 is installed at a point where the curvature of the arc portion 20a is the largest, and the arc portion 20a is provided. The variable length carrier roller devices 1 and 1 are also installed in the straight portions before and after the.

  In such a belt conveyor device 20, when the conveyor belt 16 travels along the circular arc portion 20 a, an object to be conveyed from the conveyor belt 16 is likely to fall, and the crushed stone G has a centrifugal force, and thus the outside direction of the curve Since it moves in the direction of arrow D, it can be considered that the crushed stone G falls downward from the edge 16a of the conveyor belt 16 outside the curve in the arc portion 20a. In this case, even if the crushed stone G is detached from the edge 16a of the conveyor belt 16 and falls downward on the outside of the curve, the outer separation distance S2 is larger than the diameter L (= 120 mm) of the crushed stone S (S2). = 126 mm), the crushed stone S smoothly passes through the gap of the outer separation distance S2 and falls downward. Therefore, in the curve, the crushed stone S is in contact with the side surface 5a of the variable length carrier roller 5 and the carrier. The side surface 5 a of the carrier roller 5 or the housing 8 is not damaged by being sandwiched between the inclined surface 6 ′ of the stand 6. Further, when the crushed stone S is sandwiched in the gap S2, smooth rotation of the carrier roller 5 is not hindered. Therefore, the life of the variable length carrier roller 5 can be greatly extended.

  As described above, Table 1 shows the conventional inclined carrier roller widths (C = 145 mm, 210 mm, 420 mm, 650 mm) used in the conventional inclined carrier roller device, and the widths of the respective conventional inclined carrier roller widths. The object to be conveyed (diameter L is small, medium or large) that can be conveyed corresponding to C, and the outside separation distance of the variable length carrier roller device 1 corresponding to each of small, medium, and large diameter L of the object to be conveyed The size of S2 and the width C ′ of the variable length carrier roller 5 are shown.

  In this case, the outer separation distance S2 is configured to be slightly larger than the diameter L of the conveyed object for any variable carrier roller width C '. In Table 1, as an example, the outer separation distance S2 is 10% of the conventional inclined carrier roller width C when the diameter L of the conveyed object is “small” for any variable carrier roller width C ′. (S2 = C × 0.1), when the diameter L of the object to be conveyed is “medium”, the outer separation distance S2 is 30% of the conventional inclined carrier roller width C (S2 = C × 0.3), When the diameter L of the conveyed product is “large”, the outer separation distance S2 is 60% of the conventional inclined carrier roller width C (S2 = C × 0.6).

  With this configuration, it is possible to easily determine an appropriate outer separation distance S2 for various conventional carrier roller widths C according to the size of the conveyed object.

  In the case of the above embodiment (FIG. 4), the belt width in Table 1 is 1200 mm, and the width C of the conventional inclined carrier roller is 420 mm (Example 3). Is 30 mm (small), S2 = 42 mm (the width C ′ of the variable length carrier roller 5 is 383 mm) (see FIG. 4A), and when the diameter L of the conveyed object is 120 mm (medium), S2 = 126 mm (the width C ′ of the variable length carrier roller 5 is 299 mm) (see FIG. 4B), and when the diameter L of the conveyed object is 240 mm (large), S2 = 252 mm (the width of the variable length carrier roller 5) C ′ is 173 mm) (see FIG. 4C). It should be noted that S1 = 5 mm when the conveyed object is large, medium, or small.

Further, when the width of the conventional inclined carrier roller is 145 mm (belt width 400 mm) (in the case of the belt width 400 mm of Example 1 in Table 1), the diameter of the conveyed object with respect to the conventional inclined carrier roller width C When L is “small” (L = 10 mm), the outer separation distance S2 is 10% of the conventional inclined carrier roller width C S2 = 14.5 mm (the width C ′ of the variable length carrier roller 5 is 134.5 mm). When the diameter L of the object to be conveyed is “medium” (L = 40 mm), the outer separation distance S2 is 30% of the conventional inclined carrier roller width C = S2 = 43.5 mm (the width C of the variable carrier roller 5) 'Is 105.5 mm), and when the diameter L of the conveyed object is “large” (L = 80 mm), the outer separation distance S2 is 87 mm (60% of the conventional inclined carrier roller width C). Width C ′ is 62 mm) Also in this case, S1 = 4 mm regardless of whether the conveyed object is large, medium, or small. Similarly, Example 2 and Example 4 in Table 1 are multiplied by 10%, 30%, and 60% based on the conventional carrier roller width C in accordance with the size of the conveyed object. Accordingly, the outer separation distance S2 can be easily calculated, and therefore the width C ′ of the variable length carrier roller 5 can be easily determined by the equation (1).
C ′ = C− (S2−S1) (1)

表２には、表１における各実施例１〜４における外側離間距離Ｓ２の従来型傾斜キャリアローラ幅Ｃに対する比率（％）の幅を示している。例えば表１の実施例２の場合、「略１０％」は、９．６％（下限値、表１の実施例２の場合、Ｓ２＝２０．１６ｍｍ）〜１３％（上限値、同実施例２の場合、Ｓ２＝２７．３ｍｍ）、「略３０％」は、例えば２９％（下限値、表２の実施例２の場合、Ｓ２＝６０．９ｍｍ）〜３２％（上限値、同実施例２の場合、Ｓ２＝６７．２ｍｍ）、「略６０％」は、例えば５８％（下限値、表１の実施例２の場合、Ｓ２＝１２１．８ｍｍ）〜６３％（上限値、同実施例２の場合、Ｓ２＝１３２．３ｍｍ）とすることができ、外側離間距離Ｓ２の下限値は、被搬送物の直径Ｌより若干大となるように設定することが好ましい。

Table 2 shows the width of the ratio (%) of the outside separation distance S2 in each of Examples 1 to 4 in Table 1 with respect to the conventional inclined carrier roller width C. For example, in the case of Example 2 in Table 1, “approximately 10%” is 9.6% (lower limit, in the case of Example 2 in Table 1, S2 = 20.16 mm) to 13% (upper limit, same example) 2 is S2 = 27.3 mm), and “approximately 30%” is, for example, 29% (lower limit, in the case of Example 2 in Table 2, S2 = 60.9 mm) to 32% (upper limit, the same example 2 is S2 = 67.2 mm), “approximately 60%” is, for example, 58% (lower limit, in the case of Example 2 in Table 1, S2 = 121.8 mm) to 63% (upper limit, same example) In the case of 2, S2 = 132.3 mm), and the lower limit value of the outer separation distance S2 is preferably set to be slightly larger than the diameter L of the conveyed object.

  Similarly, for example, in the case of Example 3, when the object to be conveyed is small, S2 is 8% to 11% (approximately 10%), and when the object to be conveyed is inside, S2 is 29% to 31% ( When the transported object is large, S2 is 58% to 62% (approximately 60%), and in other embodiments, it is determined within the range of the lower limit value to the upper limit value shown in Table 2. good.

  Further, as described above, the outside separation distance S2 is simply 10% of the conventional inclined carrier roller width when the conveyed object is small, and the conventional inclined carrier roller width when the conveyed object is inside, as described above. When the conveyed object is large, it can be calculated as 60% of the conventional inclined carrier roller width. The width (range) of the ratio (%) in cases other than Example 2 is as shown in Table 2, and the lower limit value of the ratio (%) indicated by the underline in Table 2 is larger than the diameter L of the conveyed object. It has become.

  Thus, in the variable carrier roller device 1 according to the present invention, the inner separation distance S1 between the side surface 5b of the housing 8 inside the variable carrier roller 5 and the inner carrier stand 4 is a standard value (existing Value) and the outer separation distance S2 between the side surface 5a of the housing 8 outside the variable length carrier roller 5 and the carrier stand 6 is configured to be slightly larger than the diameter L of the object to be conveyed. By arranging such a variable carrier roller device 5 at a position where the object to be transported easily falls on the conveyor belt 16 in the belt conveyor device 20, when the object to be transported falls from the conveyor belt 16, it is transported. The object can be smoothly dropped through the space of the outer separation distance S2 between the variable length carrier roller 5 and the carrier stand 6 and dropped downward.

  As a result, the object to be conveyed is sandwiched between the outer side surface 5a of the variable length carrier roller 5 and the inclined surface 6 'of the carrier stand 6, and the side surface 5a of the variable length carrier roller 5 or the housing 8 is damaged. It can be effectively prevented.

  As described above, according to the present invention, even if the object to be transported falls off from the outer edge of the conveyor belt 16, the dropped object to be transported can be smoothly dropped downward through the space of the outer separation distance S2. In addition, the side surface 5a of the variable length carrier roller 5 and the housing 8 can be effectively prevented from being damaged, and the life of the variable length carrier roller 5 can be greatly extended.

  In addition, for various conventional carrier roller widths, an appropriate outer separation distance can be easily determined according to the size of the conveyed object.

  Further, by applying the variable length carrier roller device 1 according to the present invention to the belt conveyor device 20, it is possible to effectively damage the variable length carrier roller 5 at a place where the object to be conveyed is easily dropped from the conveyor belt 16. Can be prevented.

  The variable length carrier roller device of the present invention can greatly extend the life of the variable length carrier roller by applying it to a belt conveyor device that conveys various sizes of coal, crushed stone, and the like. It can be widely used in belt conveyor devices.

DESCRIPTION OF SYMBOLS 1 Variable length carrier roller apparatus 2 Horizontal center axis | shaft 3 Horizontal carrier roller 4 Inner carrier stand 4b U-shaped bearing groove (groove)
4 "inclined surface (support surface)
5 Variable length carrier roller 5a Side (outside)
5b Side (inside)
6 Outer carrier stand 6a U-shaped bearing groove (groove)
6 'Inclined surface (support surface)
7 Inclined central shaft 7 'Notched surface 8 Housing 16 Conveyor belt 20 Belt conveyor device 30 Conventional inclined carrier roller device S1 Inner separation distance S2 Outer separation distance L Diameter C Conventional inclined carrier roller width C' Variable carrier roller width E Area

Claims (9)

An inclined central axis is provided between a pair of inner carrier stands that support both ends of the horizontal central axis of the central horizontal carrier roller and a pair of outer carrier stands located on both outer sides of the pair of inner carrier stands. A variable length carrier roller device having a pair of variable length carrier rollers supported in an inclined state so as not to move in the direction of the inclined central axis,
Each of the variable length carrier rollers maintains an existing value of the inner separation distance between the support surface of the inclined central axis of the inner carrier stand and the inner side surface of the variable length carrier roller,
The outer separation distance between the support surface of the inclined central axis of the outer carrier stand and the outer side surface of the variable length carrier roller is an outer separation distance slightly larger than the diameter of the conveyed object,
A variable length carrier roller device characterized in that the outer separation distance is larger than the inner separation distance.   Each of the pair of variable length carrier rollers has an outer housing structure formed at a position closer to the inner side than the inclined central axis to each outer side surface to the outer tip of the inclined central axis. 2. The variable length carrier roller device according to claim 1, wherein the distance is larger than the distance from each of the inner side surfaces to the inner tip of the inclined central axis.   The pair of variable length carrier rollers have notch surfaces on both side surfaces of the inclined central axes, and the notch surfaces are formed in grooves on the support surfaces of the inner carrier stand and the outer carrier stand. 3. The variable length carrier roller device according to claim 1, wherein the variable length carrier roller device is supported so as not to move in the direction of the inclined central axis by being fitted.   The outer separation distance is approximately 10% of the conventional inclined carrier roller width when the diameter of the conveyed object is small, and approximately 30% of the conventional inclined carrier roller width when the diameter of the conveyed object is medium. 4. The variable length carrier roller device according to claim 1, wherein when the diameter of the object is large, it is approximately 60% of the width of the conventional inclined carrier roller. A belt conveyor device using the variable length carrier roller device according to any one of claims 1 to 4,
A belt conveyor device, wherein one or a plurality of the variable carrier roller devices are installed in an area where an object to be conveyed is likely to fall from the conveyor belt.   The one or more of the variable carrier roller devices are installed between conventional inclined carrier roller devices installed at predetermined intervals along the traveling direction of the belt conveyor. 5. The belt conveyor device according to 5. An inclined central axis is provided between a pair of inner carrier stands that support both ends of the horizontal central axis of the central horizontal carrier roller and a pair of outer carrier stands located on both outer sides of the pair of inner carrier stands. A variable length carrier roller supported in an inclined state,
The variable length carrier roller has notch surfaces on both side surfaces of the inclined central shaft, and the notch surfaces are fitted into grooves on the support surfaces of the inner carrier stand and the outer carrier stand. , Is supported immovably in the direction of the inclined central axis,
The position of the inner side surface of the variable length carrier roller is such that the inner separation distance between the support surface of the inclined central axis of the inner carrier stand and the side surface inside the variable length carrier roller is an existing value. Formed in the position
The position of the outer side surface is a position where the distance between the support surface of the inclined central axis of the outer carrier stand and the side surface outside the variable length carrier roller is an outer separation distance slightly larger than the diameter of the object to be conveyed. Formed into
A variable length carrier roller, wherein the outer separation distance is greater than the inner separation distance.   In the variable length carrier roller, only the outer housing structure is formed at a position closer to the inside with respect to the inclined central axis, so that the distance from the outer side surface to the outer tip of the inclined central axis is 8. The variable length carrier roller according to claim 7, wherein the variable length carrier roller is configured to be larger than a distance from the inner side surface to the inner tip of the inclined central axis.   The outer separation distance is approximately 10% of the conventional inclined carrier roller width when the diameter of the conveyed object is small, and approximately 30% of the conventional inclined carrier roller width when the diameter of the conveyed object is medium. 9. The variable length carrier roller according to claim 7 or 8, wherein when the diameter of the object is large, it is about 60% of the width of the conventional inclined carrier roller.

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