Roller shaft support structure for belt conveyor roller

Abstract

To provide a roller shaft support structure of a belt conveyor roller capable of avoiding contact with a conveyor belt of the belt conveyor roller in which a bearing part of a roller shaft is damaged.SOLUTION: Contact between a conveyor belt and a belt conveyor roller having a damaged bearing section can be avoided by supporting the roller shaft of the belt conveyor roller on the roller shaft supporting section of a roller shaft supporting means via a rotating member which rotates when bearing resistance caused by damage to the bearing section of the roller shaft of the belt conveyor roller increases to a predetermined value or more, and lowering the roller shaft of the belt conveyor roller by a predetermined dimension from the original position by rotation of the rotating member when bearing resistance caused by damage to the bearing section of the roller shaft of the belt conveyor roller increases to a predetermined value or more.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The invention of this application relates to a roller shaft support structure for a roller for a belt conveyor. [Background technology]

[0002] Rollers for belt conveyors (hereinafter simply referred to as conveyor rollers) are widely used as a means of supporting and transporting the load of a conveyor belt. The conveyor belt is wound around the outer periphery of a carrier-side conveyor roller (carrier idler) located on the upper side and a return-side conveyor roller (return idler) located on the lower side, and is configured to run by driving a conveyor pulley.

[0003] Each conveyor roller that supports the conveyor belt is configured by rotatably attaching a cylindrical wheel section to the roller shaft via a bearing section (a bearing section that functions as a rolling bearing), and both ends of the roller shaft are supported in a non-rotatable engaged state (the flat sections at both ends of the roller shaft are engaged) with the roller shaft support section (U-shaped fitting groove) of the carrier stand (roller stand), which serves as the roller shaft support means.

[0004] In normal conditions where the bearing parts of the roller shafts function normally, the conveyor belt comes into contact with the wheel parts (shell parts) of each conveyor roller (carrier idler) while running, and each conveyor roller rotates smoothly relative to the roller shaft with extremely small bearing resistance (rolling resistance) while supporting its work load.

[0005] However, such belt conveyors are often used to transport materials containing powder and granular materials such as ore, earth, sand, and coal (so-called bulk materials), and are usually operated in fairly harsh environments. Therefore, the bearings of each conveyor roller are prone to damage (e.g., bearing breakage) due to the intrusion of rainwater and dust in addition to the severe load caused by the materials. When damage occurs to the bearings of the conveyor rollers, the bearing resistance of the roller shaft bearing increases, preventing the wheel from rotating freely (if the damage is severe, the bearing function is lost and the wheel stops rotating).

[0006] As a result, frictional heat is generated between the wheel (shell surface) and the conveyor belt. This frictional heat accumulates in the wheel, causing the wheel to gradually become hotter, which can damage the conveyor belt that is in contact with the wheel and may even lead to a fire.

[0007] To avoid such accidents, conventionally, inspectors would make regular rounds to check each of the numerous conveyor rollers for abnormalities. In this method, the inspector would walk along the belt conveyor and visually check for any conveyor rollers that had stopped rotating, auditory check for any abnormal noises from the bearings, and olfactory check for any strange odors coming from the conveyor belt.

[0008] However, with this sensory inspection method that relies on the inspector's senses of sight, hearing, and smell, the number of conveyor rollers to be inspected increases as the conveyor travels longer, requiring a great deal of time and effort for inspection. It is also difficult to accurately identify abnormalities, and there is a risk of bearing damage being overlooked.

[0009] On the other hand, if such damage to the bearings could be detected early on, it would be possible to replace the rollers and bearings before overheating, seizure, etc., occurs, thereby preventing fires and other accidents from occurring.

[0010] From this viewpoint, the roller shaft of the conveyor roller is not directly supported by the roller shaft support portion (U-shaped fitting groove) of the roller shaft support means (carrier stand), but in a normal state where the bearing portion of the roller shaft of the conveyor roller is not damaged, the bearing resistance (sliding friction resistance of the fitting portion in a fitted state) of the roller shaft support portion (U-shaped fitting groove) is sufficiently larger than the bearing resistance of the bearing portion of the roller shaft of the conveyor roller, and the roller shaft of the conveyor roller is supported in a locked state where it cannot rotate relatively when it is stationary, while when the bearing portion of the roller shaft of the conveyor roller is damaged and the bearing resistance of the bearing portion of the roller shaft of the conveyor roller is larger than the bearing resistance of the roller shaft One of the inventors of the present application has proposed a damage detection device for the bearing portion of the roller shaft of a conveyor roller (see, for example, the invention in Patent Document 1). The device includes an arm member that rotates through a predetermined angle when the bearing resistance (sliding friction resistance of the fitting portion in a fitted state) against the support portion (U-shaped fitting groove), and the roller shaft of the conveyor roller is supported by the roller shaft support portion via the arm member. When the arm member rotates through a predetermined angle due to damage to the bearing portion of the roller shaft, damage display means in a bearing damage display portion is activated via a wire, thereby detecting damage to the bearing portion of the roller shaft (see, for example, the invention in Patent Document 1).

[0011] According to such a configuration of the bearing damage detection device, by setting the bearing resistance of the arm member at the roller shaft support portion of the roller shaft support means such as a carrier stand (the sliding friction resistance of the arm member against the arm member fitting groove of the roller shaft support portion) to an appropriate value, it becomes possible to detect the damage state of the roller shaft bearing portion at an appropriate time for replacement, and it becomes possible to replace the conveyor roller or its bearing portion before the roller shaft bearing portion becomes seized, thereby preventing the occurrence of fires and the like. [Prior art documents] [Patent documents]

[0012] [Patent Document 1] Patent No. 6518371 Summary of the Invention [Problem to be solved by the invention]

[0013] In the case of the invention of Patent Document 1, it is possible to identify a specific conveyor roller with a damaged bearing among a large number of conveyor rollers, but in order to replace the specific conveyor roller (or its bearing), it is necessary to stop operation of the belt conveyor itself.

[0014] However, in belt conveyor facilities with total lengths of several kilometers or even tens of kilometers, such as power plants, steel mills, and paper mills, it is impossible to stop operation of the equipment to replace some of the rollers, and even if damaged rollers are detected, they cannot be replaced. Therefore, in such facilities, even if the above detection device is used, the risk of fire cannot be avoided, and the detection device is not being used to its full potential.

[0015] The invention of this application has been made to solve such problems, In this roller shaft support structure for a belt conveyor roller, the roller shaft support structure comprises: roller shaft support means having a roller shaft support portion that supports the roller shaft of a belt conveyor roller having a built-in bearing portion; and a rotating member that is rotatably supported on the roller shaft support portion between the roller shaft support portion of the roller shaft support means and the roller shaft with a bearing resistance greater than the bearing resistance of the bearing portion of the roller shaft, and supports the roller shaft in an unrotatable state in this supported state. A roller shaft drop-in groove into which the roller shaft is dropped is provided below the rotating member fitting groove in the roller shaft support portion of the roller shaft support means, and when the bearing portion of the roller shaft is damaged and the bearing resistance of the bearing portion of the roller shaft becomes greater than the bearing resistance of the rotating member fitting portion, the rotation of the roller shaft by the belt conveyor roller rotates the rotating member supporting the roller shaft so that the U-shaped roller shaft fitting groove faces downward, and the roller shaft is dropped into the roller shaft drop-in groove. The object of the present invention is to provide a roller shaft support structure for a belt conveyor roller that prevents contact between a belt conveyor roller with a damaged bearing portion and the conveyor belt. [Means for solving the problem]

[0016] In order to solve the above problems, the invention of this application is configured to include the following means for solving the problems.

[0017] (1) Means for solving the problem of the invention of claim 1 The means for solving the problems of this invention is a roller shaft support means having a roller shaft support portion that supports a roller shaft of a belt conveyor roller with a built-in bearing portion, and a roller shaft support means between the roller shaft support portion of the roller shaft support means and the roller shaft, which is rotatably supported by the roller shaft support portion with a bearing resistance greater than the bearing resistance of the bearing portion of the roller shaft, and in this supported state, the roller shaft is in an unrotatable state. Supported by a rotating member that supports the The roller shaft support portion is configured to have a U-shaped rotating member fitting groove on the upper side that fits and supports the rotating member, and a roller shaft drop-in groove on the lower side that drops the roller shaft downward, both of which are continuous with each other; the rotating member is configured to include a fitting portion having an arcuate surface structure that fits into the U-shaped rotating member fitting groove of the roller shaft support portion, and a U-shaped roller shaft fitting groove that is located inside the fitting portion having the arcuate surface structure and fits and supports the roller shaft from above to below in a state in which the roller shaft cannot rotate relative to the fitting portion; the rotating member is rotatably supported by the roller shaft support portion by fitting the fitting portion having the arc surface structure into the U-shaped rotating member fitting groove of the roller shaft support portion in a state where the bearing resistance is greater than the bearing resistance of the bearing portion of the roller shaft, The bearing portion of the roller shaft is damaged, and the bearing resistance of the bearing portion of the roller shaft is , the roller shaft support portion The rotating member Fitting part When the bearing resistance of the belt conveyor roller becomes larger than the rotation of the roller shaft, Ri, up The roller shaft is supported by the above Rotating member The U-shaped roller shaft fitting groove faces downwards. Rotate, Above B -Later axis Drop it into the roller shaft recess This prevents contact between the belt conveyor roller with a damaged bearing portion and the conveyor belt.

[0018] That is, in the means for solving the problems of the present invention, a roller shaft support means having a roller shaft support portion for supporting a roller shaft of a belt conveyor roller having a built-in bearing portion; and a rotating member disposed between the roller shaft support portion of the roller shaft support means and the roller shaft, the rotating member being rotatably supported on the roller shaft support portion with a bearing resistance greater than the bearing resistance of the bearing portion of the roller shaft, and supporting the roller shaft in an unrotatable state in the supported state; The roller shaft support portion is configured to have a U-shaped rotating member fitting groove on the upper side that fits and supports the rotating member, and a roller shaft drop-in groove on the lower side that drops the roller shaft downward, both of which are continuous with each other; the rotating member is configured to include a fitting portion having an arcuate surface structure that fits into the U-shaped rotating member fitting groove of the roller shaft support portion, and a U-shaped roller shaft fitting groove that is located inside the fitting portion having the arcuate surface structure and fits and supports the roller shaft from above to below in a state in which the roller shaft cannot rotate relative to the fitting portion; The rotating member is rotatably supported on the roller shaft support portion by fitting the arc-surface structure fitting portion into the U-shaped rotating member fitting groove of the roller shaft support portion with a bearing resistance greater than the bearing resistance of the bearing portion of the roller shaft.

[0019] In this configuration, when the bearing portion of the roller shaft of the belt conveyor roller is in a normal state, the bearing resistance (rolling resistance) of the bearing portion of the roller shaft of the belt conveyor roller is much smaller than the bearing resistance (sliding friction resistance) between the outer peripheral surface of the arc-surface-structured fitting portion of the rotating member that supports the roller shaft of the belt conveyor roller via the U-shaped roller shaft fitting groove and the inner peripheral surface of the U-shaped rotating member fitting groove of the roller shaft support portion, so that the rotating member does not rotate and reliably supports the roller shaft, which is fitted and supported by dropping it from above to below in the U-shaped roller shaft fitting groove of the roller shaft support portion, in a stationary state that prevents it from rotating relatively. Therefore, the belt conveyor roller (wheel portion) supported by the roller shaft via the bearing portion can rotate freely.

[0020] On the other hand, when damage occurs to the bearing portion of the roller shaft of the belt conveyor roller, the damage causes an increase in bearing resistance of the roller shaft bearing portion, and when this bearing resistance becomes greater than the bearing resistance of the rotating member fitting portion of the roller shaft support portion (the bearing resistance between the outer peripheral surface of the fitting portion of the arc surface structure of the rotating member and the inner peripheral surface of the U-shaped rotating member fitting groove of the roller shaft support portion), the rotation of the roller shaft by the belt conveyor roller rotates the rotating member supporting the roller shaft via the U-shaped roller shaft fitting groove so that the U-shaped roller shaft fitting groove faces downward, and the roller shaft drops into the roller shaft drop-in groove.

[0021] That is, when the degree of damage to the bearing portion of the roller shaft reaches a predetermined level or more, the belt conveyor roller (wheel portion) and the roller shaft become one, and the conveyor belt with a large conveying force rotates the belt conveyor roller (wheel portion) with a torque equal to or greater than a predetermined torque, and the rotating member is rotated in the conveying direction of the conveyor belt via the roller shaft.

[0022] Therefore, by utilizing this rotational force, the rotating member supporting the roller shaft via the U-shaped roller shaft fitting groove is rotated so that the U-shaped roller shaft fitting groove faces downward, and the roller shaft is dropped by the weight of the belt conveyor roller itself including the wheel portion, and dropped into the roller shaft drop-in groove of the roller shaft support portion.

[0023] In the configuration of the means for solving the problems of this invention, as described above, the roller shaft recess groove is provided in the roller shaft support portion so as to be continuous with the lower side of the U-shaped rotating member fitting groove that fits and supports the rotating member. Therefore, the belt conveyor roller (wheel portion) whose roller shaft is recessed into the roller shaft recess groove drops downward by a predetermined distance and is effectively separated downward from the conveyor belt. As a result, contact between the belt conveyor roller (wheel portion) whose bearing portion is damaged to a predetermined level or more and the conveyor belt is reliably avoided.

[0024] Furthermore, in the roller shaft support portion, if the U-shaped rotating member fitting groove that fits and supports the rotating member and the roller shaft drop-in groove into which the roller shaft is dropped are positioned one above the other and are continuous with each other, when the rotating member that supports the roller shaft in a fitted state where it is dropped from above downward is rotated so that the U-shaped roller shaft fitting groove faces downward, the roller shaft drop-in groove can be made to be a straight continuation of the U-shaped roller shaft fitting groove on the rotating member side, and the U-shaped roller shaft fitting groove on the rotating member side, which is now in the reversed up-down direction, will be a straight continuation of the roller shaft drop-in groove, so that the roller shaft of a belt conveyor roller with a damaged bearing can be more reliably and quickly dropped into the roller shaft drop-in groove.

[0025] therefore According to the means for solving the problems of the present invention, even if the bearing portion of the roller shaft of a specific belt conveyor roller is damaged due to the scale of the equipment, and the equipment must still be operated, at least the belt conveyor in which the bearing portion of the roller shaft is damaged can be operated. UseThis eliminates the risk of the roller coming into contact with the conveyor belt during transportation and being maintained in a frictional state (overheated state), and reliably avoids the risk of fires and other accidents caused by such friction.

[0026] Moreover, the above conveyor belt Use roller shaft of the roller Drop into the roller shaft recess The operation is The relevant Since this can be done by utilizing the rotation of the rotating member that supports the roller shaft, no new components or new rotational movements are required, so the structure is extremely simple and can be realized at low cost.

[0027] (2) Means for solving the problem of the invention of claim 2 The means for solving the problems of the present invention is configured as the means for solving the problems of the invention of claim 1 above, in which the bottom surface of the roller shaft insertion groove is formed into a tapered surface that is inclined in the vertical direction.

[0028] If the bottom surface of the roller shaft drop-in groove is horizontal, and the plate thickness of the roller shaft support means (carrier stand) is a predetermined dimension (for example, about 6 mm), there is a problem that debris from the transported workpiece, such as coal chips, will accumulate on the bottom surface, making the roller shaft drop-in groove shallow.

[0029] Therefore, the bottom surface of the roller shaft recess groove is formed as a tapered surface (knife edge structure) that is inclined in the vertical direction.

[0030] This configuration can reliably solve the problem of coal chips and other debris from the transported workpiece accumulating on the bottom surface and causing the roller shaft recess groove to become shallow.

[0031] (3) Means for solving the problem of the invention of claim 3 The solution to the problem of the present invention is configured as the solution to the problem of the invention of claim 1 or 2, wherein the rotating member has: When the bearing of the roller shaft is damaged, the rotating member rotates to activate the roller shaft bearing damage indicating means via the wire. An arm is provided According to this configuration, When the bearing of the roller shaft is damaged, the rotation of the rotating parts By rotating the arm, a predetermined amount of damage is detected via a wire, just like the conventional damage detection device described above.Roller shaft bearing Damage indicating means can be activated to provide a similar damage detection function. [Effects of the Invention]

[0032] As a result of the above, according to the invention of this application, even in the case of large-scale belt conveyor facilities with total lengths of several kilometers or even tens of kilometers, such as those in power plants, steel mills, and paper factories, it becomes possible to stop the equipment periodically (every one to several months) and replace rollers with damaged bearings all at once, thereby greatly improving the efficiency of roller replacement.

[0033] Furthermore, compared to when the operation of the facility is stopped for a short period of time, the operating efficiency and cost performance of the facility itself are improved.

[0034] Furthermore, even if there are a certain number of rollers with damaged bearings in the equipment, each of these rollers will retreat a predetermined distance below the carrier-side conveyor belt, and there will be no direct friction between the roller shell surface and the conveyor belt, so there is no risk of fire or the like.

[0035] In addition, the driving load of the conveyor belt is reduced, reducing energy loss.

[0036] Furthermore, unnecessary wear of the conveyor belt is eliminated, and the durability of the conveyor belt is improved.

[0037] In addition, the conventional daily inspection work will no longer be necessary, significantly reducing labor costs. [Brief explanation of the drawings]

[0038] [Figure 1] 1 is a central cross-sectional view showing the overall configuration of a roller shaft support structure in a roller shaft support means of a belt conveyor roller (hereinafter simply referred to as a conveyor roller) according to an embodiment of the present invention. [Figure 2] 2 is a partial cross-sectional front view showing the overall configuration of a roller shaft support structure in a roller shaft support means of the conveyor roller. FIG. [Figure 3]FIG. 2 is an exploded perspective view showing the configuration of a main part of a roller shaft support structure in a roller shaft support means of the conveyor roller. [Figure 4] 10 is a plan view (top view) showing a configuration (general-purpose configuration) of the outer end of the roller shaft of the conveyor roller supported by the roller shaft support structure in the roller shaft support means of the conveyor roller. FIG. [Figure 5] FIG. 10 is a front view showing the configuration of the roller shaft support means and the roller shaft support portion of the roller shaft support means (a configuration in which a rotating member fitting groove and a roller shaft drop groove are provided in the roller shaft support structure of the roller shaft support means of the conveyor roller). [Figure 6] 10 is a front view showing the configuration of a rotating member interposed in a roller shaft supporting portion of the roller shaft supporting means in the roller shaft supporting structure of the roller shaft supporting means of the conveyor roller. FIG. [Figure 7] FIG. 2 is a rear view showing the configuration of the rotary member. [Figure 8] FIG. 2 is a plan view (top view) showing the configuration of the rotary member. [Figure 9] FIG. 2 is a bottom view (underside view) showing the configuration of the rotary member. [Figure 10] FIG. 2 is a left side view showing the configuration of the rotating member. [Figure 11] 10A to 10C are diagrams illustrating the operation of detecting damage to the bearing portion of the roller shaft due to the rotation of a rotating member interposed in the roller shaft support portion of the roller shaft support means, and the operation of lowering the roller shaft due to the rotation of a rotating member interposed in the roller shaft support portion of the roller shaft support means, in the roller shaft support structure of the roller shaft support means of the conveyor roller. [Figure 12] FIG. 11(c) shows a state similar to that of FIG. 11(c), illustrating a configuration in which a stopper is provided in the roller shaft support structure of the roller shaft support means of the conveyor roller, which stops the rotation of the rotating member in accordance with the lowered (dropped) position of the roller shaft. [Figure 13] FIG. 2 is a central cross-sectional view similar to FIG. 1 showing an example of a stopper installation structure in which a stopper is provided to stop the rotation of a rotating member corresponding to a lowered (dropped) position of the roller shaft in the roller shaft support structure of the roller shaft support means of the conveyor roller. [Figure 14]FIG. 6 is a cross-sectional view (cross-sectional view of the AA line in FIG. 5) showing a configuration in which a drop groove (retraction groove) for the roller shaft is provided below the rotating member fitting groove of the roller shaft support part of the roller shaft support means in the roller shaft support structure of the roller shaft support means of the conveyor roller. [Figure 15] 15 is a cross-sectional view of a modified example of the roller shaft support structure of the roller shaft support means of the conveyor roller shown in FIG. 14, in which a drop groove (retreat groove) for the roller shaft is provided below the rotating member fitting groove of the roller shaft support part of the roller shaft support means, and the bottom surface of the drop groove (retreat groove) is formed into a tapered surface. [Figure 16] FIG. 13 is a partial cross-sectional view of a modified example corresponding to the configuration of FIG. 12 , in which a roller shaft support structure in the roller shaft support means of the conveyor roller is provided with a drop groove (retreat groove) for the roller shaft below the rotating member fitting groove of the roller shaft support part of the roller shaft support means, and the bottom of the drop groove (retreat groove) is modified to a V-shaped groove. DETAILED DESCRIPTION OF THE INVENTION

[0039] Next, specific embodiments for carrying out the invention of this application will be described in detail with reference to FIGS.

[0040] <Configuration of roller shaft support structure in roller shaft support means of belt conveyor roller according to embodiment of the invention of this application> First, FIGS. 1 and 2 show the overall configuration of a roller shaft support structure in a roller shaft support means of the belt conveyor roller (hereinafter simply referred to as a conveyor roller).

[0041] 1 and 2, reference numeral 4 denotes a roller shaft support means having a roller shaft support structure according to an embodiment of the present invention. This roller shaft support means 4 is, for example, a carrier stand (roller stand), and is made of a metal plate of a predetermined width, thickness (e.g., approximately 6.0 mm), and height. It has a mounting portion for attaching to a housing at its lower end and a roller shaft support portion 3 at its upper end that supports a roller shaft 2 of a conveyor roller (carrier idler) 1. The roller shaft support structure according to the embodiment of the present invention is provided at the roller shaft support portion 3, and the roller shaft 2 of the conveyor roller 1 is supported by the roller shaft support portion 3 of the same structure via a rotating member 5 that functions as a roller shaft support member. Reference numeral 6 denotes a carrier-side conveyor belt that supports a work load by the conveyor roller 1 and is held in a transportable state.

[0042] The conveyor roller 1 is composed of a cylindrical shell portion 7, a housing portion 8 at the end of the shell portion 7, a small-diameter cylindrical inner plate portion 9 located in the center of the housing portion 8 and recessed inside the shell portion 7, a bearing portion (bearing portion) 10 provided between the inner plate portion 9 and the roller shaft 2, and a seal portion (labyrinth seal portion) 11 similarly provided between the inner plate portion 9 and the roller shaft 2.

[0043] In a normal state where the bearing portion (bearing portion) 10 of the conveyor roller 1 performs an appropriate bearing function as a rolling bearing, the shell portion 7, housing portion 8, and inner plate portion 9 (wheel portion) are supported by the bearing portion (bearing portion) 10 with extremely small bearing resistance (small axial torque) relative to the roller shaft 2, allowing them to rotate freely and smoothly transport the conveyor belt 6 that they support with relatively small frictional force.

[0044] The roller shaft 2 is made of, for example, a metal shaft having a predetermined outer diameter, and in this embodiment, its shaft end (outer end) extends laterally a predetermined length from the housing portion 8, and as shown in Figure 4, for example, chamfered grooves (small diameter portions) 21, 21 of a predetermined width and a predetermined depth are formed on both the left and right sides of the end, so that engaging ribs (large diameter portions) 22, 22 of the original shaft diameter are formed in the portions of the outer end corresponding to the chamfered grooves (small diameter portions) 21, 21.

[0045] The chamfered grooves 21, 21 portions (flat portions) and outer end engagement ribs 22, 22 portions (rib portions) of a predetermined width and depth are smoothly engaged with the first and second roller shaft engagement grooves 54A, 54B portions of the rotating member 5 shown in Figures 6 to 10 in a loose fit state that allows them to be thrust from above to below, as shown in Figure 3, for example (details will be described later).

[0046] This ensures that the roller shaft 2 and the rotating member 5 are securely engaged in the axial direction, and that the roller shaft 2 is engaged in a state in which it cannot rotate relative to the rotating member 5.Furthermore, as will be described later, when the bearing portion 10 of the roller shaft 2 is damaged and the rotating member 5 is rotated upside down by the roller shaft 2, the chamfered grooves 21, 21 and engagement ribs 22, 22 portions of the roller shaft 2 (the shaft ends of the roller shaft 2) smoothly descend (fall) downward from the first and second roller shaft engagement grooves 54A, 54B.

[0047] The structure of the chamfered grooves 21, 21 and the engaging ribs 22, 22 of the roller shaft 2 (the structure of the shaft end portion of the roller shaft 2) is a general-purpose structure for a general conveyor roller (carrier idler) 1.

[0048] 5, the roller shaft support portion 3 of the roller shaft support means 4 is configured by providing a rotating member fitting groove 31 on the upper side into which a fitting portion 52 having an arcuate surface structure of the rotating member 5, which will be described below, is fitted, and a drop groove (retraction groove) 32 for the roller shaft 2 on the lower side of the rotating member fitting groove 31. The rotating member fitting groove 31 and the drop groove (retraction groove) 32 for the roller shaft 2 are connected to each other and are provided in a substantially straight line extending from top to bottom.

[0049] Rotating member fitting groove 31 is a groove with a width corresponding to the outer diameter of the arcuate surface of fitting portion 52 of the arcuate surface structure of rotating member 5, which will be described later, and drop groove (retraction groove) 32 of roller shaft 2 is a groove with a dimension corresponding to the outer diameter between chamfered grooves 21, 21 of roller shaft 2. Rotating member fitting groove 31 is formed with an effective vertical dimension (depth dimension) that prevents the entire rotating member 5 (main body portion 51, which will be described later) with roller shaft 2 fitted therein from protruding upward, and partial arcuate surfaces 31 a, 31 a corresponding to the arcuate surface of fitting portion 52 of rotating member 5 are provided on both sides of the bottom part thereof that is continuous with drop groove (retraction groove) 32 of roller shaft 2. As a result, even though a drop groove (retreat groove) 32 for the roller shaft 2 of a width corresponding to the outer diameter of the roller shaft 2 is opened on the bottom side, the arcuate surface of the fitting portion 52 of the rotating member 5 is reliably supported in a stable state that allows it to slide and rotate, and the arcuate surfaces 31a, 31a make it possible to set an appropriate bearing resistance due to appropriate sliding friction between the arcuate surface of the fitting portion 52 of the rotating member 5.

[0050] As a result, in relation to the bearing resistance of the bearing portion 10 of the roller shaft 2, which is a rolling bearing, at a predetermined rotation angle, for example 90 degrees, a damage detection function in response to damage to the bearing portion 10 similar to the conventional method can be achieved, and at 180 degrees, a function of dropping the roller shaft 2 into the roller shaft drop-in groove 32 (conveyor roller retraction function) described below can be achieved.

[0051] The rotating member 5 is constructed using a relatively lightweight metal member that takes into consideration the ease of rotation so that damage to the roller shaft 2 can be properly detected when the roller shaft 2 is damaged, assuming the structure of the rotating member fitting groove 31 as described above. For example, as shown in Figures 3 and 6 to 10, the rotating member 5 is constructed with an approximately circular rotating member main body 51 with a predetermined thickness in the axial direction, an engaging portion 52 with an arc-shaped surface structure for the rotating member fitting groove 31, which is concentric with the rotating member main body 51 but has an outer diameter smaller by a predetermined dimension, and which is also approximately circular and has a predetermined axial thickness (length), and a triangular arm portion 53 provided at the bottom of the other side of the rotating member main body 51.

[0052] Rotating member main body 51 has a predetermined thickness in the axial direction and a predetermined outer diameter in the circumferential direction, and is formed to have the predetermined weight required to function as a torque member that detects damage to bearing 10 of roller shaft 2 when the bearing 10 of roller shaft 2 is damaged, thereby enabling the setting of a predetermined bearing resistance for detecting damage to bearing 10 of roller shaft 2. First and second roller shaft fitting grooves 54A, 54B, which are generally U-shaped and extend a predetermined length in a straight line in the vertical direction, are provided at fitting portion 52 into rotating member fitting groove 31 and on one side of rotating member main body 51 continuous with fitting portion 52. Both first and second roller shaft fitting grooves are open at the top and have an arc-shaped bottom corresponding to the outer diameter of roller shaft 2.

[0053] Of these first and second roller shaft fitting grooves 54A, 54B, the first roller shaft fitting groove 54A provided on the fitting portion 52 side is a groove of equal diameter spaced apart by a predetermined dimension smaller than the outer diameter of the shaft corresponding to the dimension between the chamfered grooves (small diameter portions) 21, 21 at the shaft end of the roller shaft 2. On the other hand, the second roller shaft fitting groove 54B provided on the rotating member main body 51 side is a groove of equal diameter spaced apart by a predetermined dimension larger than the outer diameter of the shaft end of the roller shaft 2. On the other hand, the bottom surfaces (arcuate surfaces) of the first and second roller shaft fitting grooves 54A, 54B are flush and continuous with each other.

[0054] The first roller shaft fitting groove 54A fits into the chamfered grooves (small diameter portion) 21, 21 at the shaft end of the roller shaft 2, and the second roller shaft fitting groove 54B fits into the engaging rib (large diameter portion) 22 at the shaft end of the roller shaft 2. Therefore, the shaft end of the roller shaft 2 is reliably engaged with the rotating member 5 in the rotational direction by the engagement between the chamfered grooves (small diameter portion) 21, 21 and the first roller shaft fitting groove 54A, and is reliably engaged with the rotating member 5 in the axial direction by the engagement between the engaging rib (large diameter portion) 22 and the second roller shaft fitting groove 54B.

[0055] On the other hand, the arm portion 53 is formed of a triangular piece of a predetermined thickness that extends in a tangential direction of a predetermined dimension from left and right portions of a predetermined width at the lower part of the other side of the rotating member main body 51, and whose mutually intersecting portions are processed into an arc shape. A small hole 53a is provided at the tip of the arm portion 53 for fixing a shaft member that connects a predetermined wire for operating the damage display means of the damage state display portion.

[0056] The rotating member 5 configured in this manner is supported on the roller shaft support means 4 in a state of predetermined bearing resistance (sliding friction resistance) by fitting the fitting portion 52, which is concentric with the rotating member main body 51 but has an outer diameter smaller by a predetermined dimension, and which also has a substantially circular arc-shaped structure and a predetermined axial thickness, into the rotating member fitting groove 31 of the roller shaft support portion 3 of the roller shaft support means 4 shown in Fig. 5 in a state of predetermined bearing resistance (sliding friction resistance).In this supported state, the chamfered grooves 21, 21 and engaging rib 22 at the shaft end of the roller shaft 2 are fitted into the first and second roller shaft fitting grooves 54A, 54B in a dropping state from above (from the state in Fig. 3 to the state in Figs. 1 and 2), and the roller shaft 2 is supported in an locked state where it cannot rotate relative to the roller shaft. As a result, the conveyor roller (shell portion 7 and housing portion 8) 1 supporting the conveyor belt 6 is supported in a state where it cannot rotate relative to the rotating member 5 as long as the bearing resistance of the bearing portion (bearing portion) 10 provided between it and the roller shaft 2 is at a normal bearing resistance level, and rotates freely relative to the roller shaft 2 supported via the rotating member 5 in the rotating member fitting groove 31 of the roller shaft support portion 3 in a state where the roller shaft 2 has a predetermined bearing resistance (sliding friction resistance) that is sufficiently larger than the bearing resistance (rolling bearing resistance) of the bearing portion (bearing portion) 10, smoothly supporting and transporting the conveyor belt 6. This state is shown in Figure 11(a). Naturally, the above configuration is adopted at both ends of the roller shaft 2 of each of the numerous conveyor rollers (carrier idlers) 1, i.e., at the roller shaft support portions 3, 3 of the roller shaft support means (carrier stands) 4, 4 that support both ends of the roller shaft 2 of the conveyor rollers 1.

[0057] However, if the degree of damage to the bearing portion (bearing portion) 10 becomes large, such as if the bearing of the bearing portion (bearing portion) 10 provided between the roller shaft 2 breaks, the conveyor roller (shell portion 7 and housing portion 8) 1 supporting the conveyor belt 6 will no longer be able to rotate freely with respect to the roller shaft 2, and the conveyor roller (shell portion 7 and housing portion 8) 1 will rotate integrally with the roller shaft 2 due to the frictional force with the belt portion of the conveyor belt 6. In other words, the bearing resistance of the bearing portion (bearing portion) 10 will increase significantly.

[0058] As a result, the rotational torque acting on the roller shaft 2 acts directly on the rotating member 5, and the bearing resistance is set to be greater than at least the bearing resistance of the bearing portion (bearing portion) 10 via the rotating member 5, so that the rotating member 5 fitted and supported in the rotating member fitting groove 31 of the roller shaft support portion 3 rotates integrally with the roller shaft 2, exceeding the set bearing resistance.

[0059] As a result, the arm portion 53 of the rotating member 5 first rotates 90 degrees to the right, as shown in Fig. 11(b), and the arm portion 53 pulls the wire for activating the damage display means, thereby activating the display means in the predetermined damage display unit. Note that the rotation angle of the arm portion 53 for this damage display does not necessarily have to be 90 degrees, and it may be, for example, about 30 to 40 degrees to activate the display means in the damage display unit.

[0060] That is, with the above configuration, damage to the bearing portion 10 of the roller shaft 2 caused by rotation of the arm portion 53 by 30 to 90 degrees can be reliably detected and reported.

[0061] On the other hand, in the embodiment of the invention of this application, not only is it possible to detect damage to the bearing portion 10 by rotating the rotating member 5 (arm portion 53) 30 to 90 degrees, but the rotating member 5 is also configured to be able to rotate beyond 90 degrees and ultimately up to 180 degrees (the angle at which the upper and lower positions of the rotating member 5 are reversed).

[0062] When the rotating member 5 rotates 180 degrees in this manner, the vertical positions (positions of the bottoms and openings) of the first and second roller shaft fitting grooves 54A, 54B, which are straight in the vertical direction, of the rotating member 5 are reversed, as is clear from, for example, Fig. 11(c). As a result, the roller shafts 2 fitted in the first and second roller shaft fitting grooves 54A, 54B lose their support portions and are completely released from the fitted state. The conveyor roller 1 falls downward by its own weight, and the roller shafts 2 are dropped into the roller shaft drop-in groove (roller shaft retraction groove) 32 provided below the rotating member fitting groove 31 of the roller shaft support portion 3, as shown in Fig. 11(c). The depth of the roller shaft drop-in groove (roller shaft retraction groove) 32 is selected to be sufficient so that the shell portion 7 of the conveyor roller 1 does not come into contact with the belt portion of the conveyor belt 6 in a running state.

[0063] Therefore, in this dropped state, there is no risk of contact between the shell part 7 of the conveyor roller 1 and the belt part of the conveyor belt 6, and the conveyor roller 1 with damaged bearing part 10 is reliably removed from the operating state (carrier idler state) at the level of damage (state where the damage does not progress any further), and is no longer left in the operating state (overheated state) in the damaged state as in the conventional case. Therefore, the risk of fire occurring as in the conventional case is reliably eliminated.

[0064] In the above case, when the rotating member 5 is rotated 90 degrees rightward from the normal state of FIG. 11(a) in which the first and second roller shaft fitting grooves 54A and 54B of the rotating member 5 are open on the upward side, the first and second roller shaft fitting grooves 54A and 54B are also opened on the upward side and tilt horizontally to the right. Since the width in the left-right direction of the rotating member fitting groove 31 of the roller shaft support part 3 is larger than the outer diameter of the roller shaft 2, the roller shaft 2 is gradually tilted to the right, also due to the tensile force of the conveyor belt 6. When the rotating member 5 rotates further, it remains biased to the side and falls downward while being guided by the right side wall of the rotating member fitting groove 31 of the roller shaft support part 3. However, since the curvature of the arc surface 31a at the bottom of the right side wall of the rotating member fitting groove 31 is gentle and the arc angle of the arc surface 31a is sufficiently small, the rotating member 5 does not engage with the arc surface 31a and falls smoothly into the roller shaft drop-in groove (roller shaft retraction groove) 32.

[0065] If the outer diameter of the fitting portion 52 into the rotating member fitting groove 31 on the rotating member 5 side is too small, the setting range of the bearing resistance becomes narrow, but if it is too large, the setting range of the bearing resistance can be widened. However, on the other hand, in relation to the dimensions of the roller shaft drop-in groove (roller shaft retraction groove) 32 and the roller shaft 2, the step at the bottom arc surface 31a becomes large, which raises concerns about the smoothness of the dropping action of the roller shaft 2.

[0066] The above configuration has been constructed taking these points into consideration, and achieves an effective and smooth dropping action of the roller shaft 2 while ensuring a sufficient setting range of bearing resistance in the roller shaft support portion 3 via the rotating member 5.

[0067] As a result of the above, according to the roller shaft support structure in the roller shaft support means of the conveyor roller according to the embodiment of the invention of this application, even in the case of large-scale belt conveyor facilities with a total length of several kilometers or even several tens of kilometers, such as power plants, steel mills, and paper factories, operation can be continued safely, and the equipment can be stopped periodically (every one to several months) to replace rollers with damaged bearings all at once, thereby greatly improving replacement efficiency.

[0068] Furthermore, compared to when the operation of the facility is stopped for a short period of time, the operating efficiency and cost performance of the facility itself are improved.

[0069] Furthermore, even if there are a certain number of rollers with damaged bearings in the equipment, each of these rollers can be reliably retracted a predetermined distance below the carrier-side conveyor belt, and direct friction between the roller shell surface and the conveyor belt does not occur, thereby reliably eliminating the risk of fires and other accidents.

[0070] Furthermore, the driving load of the conveyor belt is reduced, energy loss such as power consumption is reduced, and unnecessary wear of the conveyor belt is eliminated, thereby improving the durability of the conveyor belt.

[0071] In addition, since the conventional daily inspection work will no longer be necessary, labor costs will also be significantly reduced.

[0072] <Installation of stopper 40 that stops rotation of rotating member 5 according to the dropped position of roller shaft 2> According to the above configuration, when the rotating member 5 rotates 180 degrees, the vertical positions (positions of the bottoms and openings) of the first and second roller shaft fitting grooves 54A, 54B, which are straight in the vertical direction, of the rotating member 5 are completely reversed, as shown in Fig. 11(c). As a result, the roller shafts 2 fitted in the first and second roller shaft fitting grooves 54A, 54B lose their support portions and are reliably released from the fitted state, and the conveyor roller 1 falls downward by its own weight into the roller shaft drop-in groove (roller shaft retraction groove) 32 provided below the rotating member fitting groove 31 of the roller shaft support portion 3. The depth of the roller shaft drop-in groove (roller shaft retraction groove) 32 is selected to be sufficient so that the shell portion 7 of the conveyor roller 1 does not come into contact with the belt portion of the conveyor belt 6 in a running state.

[0073] Therefore, in this dropped state, there is no risk of contact between the shell part 7 of the conveyor roller 1 and the belt part of the conveyor belt 6, and the conveyor roller 1 with damaged bearing part 10 is reliably removed from operation at the level of damage (a state where the damage does not progress any further), and is no longer left in operation in a damaged state as in the past. Therefore, the risk of fire occurring as in the past is reliably eliminated.

[0074] However, until just before it falls, the roller shaft 2 is subjected to inertia in the rotational direction due to transport by the conveyor belt 6, and naturally the rotating member 5 is also affected by this. Therefore, in order to reliably and smoothly drop the roller shaft 2 into the roller shaft drop groove (roller shaft retreat groove) 32 at the above-mentioned drop position and to prevent unnecessary rotation of the rotating member 5 after it has fallen, it is preferable to reliably stop the rotation of the rotating member 5 at the drop position of the roller shaft 2 shown in Figure 11(c) above, for example, and to prevent it from rotating thereafter. This is also desirable in the sense that it does not place unnecessary strain on the wire used to detect damage to the bearing of the roller shaft 2.

[0075] For this purpose, it is preferable to provide a stopper 40 that reliably stops the rotation of the arm member 5 at the drop position (the position rotated 180 degrees), as shown in FIG.

[0076] Several configurations are conceivable for the installation structure of this stopper 40, and one of them is a configuration as shown in Fig. 13, in which the above-mentioned roller shaft support member (carrier stand) 4 is used, support members 41, 41 (front and rear ends) of a predetermined length are provided on the outer upper end side of the support member, and a stopper mounting bracket 42 of an arc angle corresponding to the rotation angle of the rotating member 5 is attached in a bridge structure between the support members 41, 41 (front and rear ends), and a bolt shaft of, for example, a predetermined diameter is screwed into the bracket 42 at a position corresponding to the rotation angle (180 degrees) in Fig. 12, with its tip projecting by a required distance toward the rotating member 5. In this way, the bolt shaft engages with the arm portion 5 of the rotating member 5 at the rotation angle position (180 degrees) in Fig. 12, and functions as a stopper.

[0077] 13, such a configuration does not hinder the roller shaft 2 of the roller 1 from fitting from above into the first and second roller shaft fitting grooves 54A and 54B on the rotating member 5. In addition, the structure is simple and can be realized at low cost.

[0078] <Regarding the bottom structure of the roller shaft recess groove (roller shaft retreat groove) 32> The bottom 32a of the drop groove (roller shaft retraction groove) 32 of the roller shaft 2 in Figures 1 to 13 described above is entirely horizontal in both the left and right directions, and its bottom surface is also a flat horizontal surface in the axial direction as shown in Figure 14.

[0079] However, in this configuration, considering that the plate thickness of the roller shaft support means (carrier stand) 4 is about 6 mm, there is a concern that debris from the transported work, such as coal chips, may accumulate in the bottom portion 32a, reducing the depth of the drop groove 32. Therefore, it is necessary to prevent debris from accumulating in the bottom portion 32a.

[0080] 15, the bottom surface shape of the bottom 32a of the drop groove (roller shaft retraction groove) 32 for the roller shaft 2 is made into a tapered surface (vertical inclined surface) inclined at a predetermined angle in the axial direction of the roller shaft 2, completely eliminating flat surfaces in the left-right and front-rear directions, so that dust does not accumulate on the bottom 32a. In other words, a knife-edge structure is adopted.

[0081] Therefore, debris from the transported work, such as coal chips, that falls into the bottom 32a of the drop-in groove (roller shaft retreat groove) 32 of the roller shaft 2 falls smoothly downward through the tapered surface, and there is no concern that the depth of the drop-in groove 32 will become shallow.

[0082] Furthermore, if the entire bottom 32a of the drop groove (roller shaft retreat groove) 32 for the roller shaft 2 is horizontal in both the left and right directions, the dropped roller shaft 2 will sway up and down and left and right due to vibrations during work transport, and will not be maintained in a stable state, which may cause rattling and noise.

[0083] Therefore, in the embodiment of the present invention, as another configuration (variant example), for example, as shown in Figure 16, the entire bottom 32a in both left and right directions is configured as a V-shaped groove surface corresponding to the shaft diameter of the roller shaft 2, rather than as a flat surface that is horizontal in both left and right directions.

[0084] In this configuration, the V-shaped groove surface, which corresponds to the shaft diameter of the roller shaft 2, stably receives both ends of the roller shaft 2 not only in the left-right direction but also in the up-down direction, thereby keeping the dropped roller shaft 2 in a stable, stationary state.

[0085] In this case, the bottom surface shape of the bottom portion 32a of the drop groove 32 may be either the shape shown in FIG. 14 or the shape shown in FIG.

[0086] <Applications of the roller shaft support structure in the roller shaft support means of the conveyor roller according to the embodiment of the present invention> The roller shaft support structure of the roller shaft support means of the conveyor roller according to the embodiment of the present invention described above can be applied not only to the case where the roller shaft support means 4 is a flat carrier stand that is horizontal in the left-right direction, but also to the roller shaft support structures of the roller shaft support parts on both ends of the central roller and the roller shaft support parts on both ends of the pair of left and right side rollers in an inverted trapezoidal carrier stand in which a pair of side rollers are provided on both sides of a horizontal central roller at a predetermined trough angle.

[0087] Furthermore, with regard to the manufacturing and sales form (embodiment of the invention), not only the manufacturing and sales of a carrier stand alone, but also the manufacturing and sales of a carrier roller set that includes a carrier stand and a conveyor roller, are embodiments of the invention of this application as long as at least the same roller shaft support structure as described above is adopted.

[0088] <Adoption of a configuration that omits bearing damage detection function and damage detection display> In the configuration of the above embodiment, as a damage detection device for the bearing portion of the roller shaft of a conveyor roller, an arm portion 53 is provided on the lower portion of the other side of the rotating member main body portion 51 of the rotating member 5, and the arm portion 53 rotates, for example, 90 degrees to the right as shown in Figure 11 (b), and pulls a wire for activating a predetermined damage display means by the rotation, and the predetermined damage display means in the predetermined damage display portion is activated via the wire.

[0089] With this configuration, the damage condition of the bearing portion 10 of the roller shaft 2 can be constantly monitored, and emergency measures can be taken in addition to regular inspections, making it highly safe. Also, if there is no damage, the period between regular inspections can be extended.

[0090] However, in the case of the above configuration, when the rotating member 5 rotates 180 degrees, the vertical positions (positions of the bottom and opening) of the first and second roller shaft fitting grooves 54A, 54B, which are straight in the vertical direction of the rotating member 5, are completely reversed, as shown in FIG. 11(c), and the roller shafts 2 fitted in the first and second roller shaft fitting grooves 54A, 54B lose their support parts and are reliably released from the fitted state. The conveyor roller 1 falls a predetermined distance downward due to the action of its own weight and the work load, and is dropped into the roller shaft drop-in groove (roller shaft retraction groove) 32 provided below the rotating member fitting groove 31 of the roller shaft support part 3.

[0091] The depth of the roller shaft recess groove (roller shaft retraction groove) 32 is selected to be large enough so that the shell portion 7 of the conveyor roller 1 does not come into contact with the belt portion of the conveyor belt 6 in a running state.

[0092] Therefore, when the conveyor roller 1 is dropped into the roller shaft drop-in groove (roller shaft retraction groove) 32, there is no risk of contact between the shell part 7 of the conveyor roller 1 and the belt part of the conveyor belt 6, and the conveyor roller 1 with damaged bearing part 10 is reliably removed from the operating state at the level of damage (a state where the damage does not progress any further), and it is no longer left in the operating state in the damaged state as in the past.

[0093] Therefore, it is possible to operate the machine safely until the scheduled inspection. During the actual operation period until the scheduled inspection, it is not necessarily meaningful to operate the predetermined damage display means in the predetermined damage display unit (it is possible to grasp the damage status of each roller, but it is not possible to take any specific measures).

[0094] On the other hand, when the roller shaft 2 is dropped into the drop groove (roller shaft retraction groove) 32 for the roller shaft 2, as is clear from Figure 11(c), the conveyor roller 1 itself is located below the conveyor belt 6 by a predetermined dimension, so that a conveyor roller 1 with a damaged bearing portion 10 of the roller shaft 2 can be easily identified during periodic inspection. In other words, in this configuration, the configuration in which the roller shaft 2 is dropped into the drop groove (roller shaft retraction groove) 32 for the roller shaft 2 itself functions as a damage detection and display device for the bearing portion 10 of the roller shaft 2.

[0095] Therefore, with the above-mentioned configuration, the damage detection function by the arm portion 53 of the rotating member 5 is not necessarily an essential component, and the arm portion 53 of the rotating member 5, the wire corresponding to the arm portion 53, and the predetermined damage display means via the wire can be omitted as necessary. This also offers great cost benefits.

[0096] In this case, as another configuration example, the arm portion 53 can function only as an engaging piece 53a for the rotary member stopper 40 of FIG. [Explanation of symbols]

[0097] 1. Conveyor roller 2. Roller shaft 3. Roller shaft support 4. Roller shaft support means (carrier stand) 5. Rotating member 6. Conveyor belt 7. Shell part 8. Housing part 10. Bearing section (bearing section) 21. Chamfer groove 22 Engagement rib 31 Rotating member fitting groove 32 Roller shaft recess groove (roller shaft retreat groove) 40 Stopper 51 Rotating member body 52: Rotating member fitting portion into rotating member fitting groove 31 54A First roller shaft fitting groove 54B Second roller shaft fitting groove

Claims

1. a roller shaft support means having a roller shaft support portion that supports a roller shaft of a belt conveyor roller having a built-in bearing portion; and a rotating member that is rotatably supported on the roller shaft support portion of the roller shaft support means with a bearing resistance greater than the bearing resistance of the bearing portion of the roller shaft, and that has a roller shaft fitting groove that fits and supports the roller shaft in an unrotatable state when supported in this supported state, When the bearing portion of the roller shaft is damaged and the bearing resistance of the bearing portion of the roller shaft becomes greater than the bearing resistance of the rotating member, the rotation of the roller shaft by the belt conveyor roller rotates the rotating member supporting the roller shaft by a predetermined angle, and the roller shaft of the belt conveyor roller is lowered a predetermined distance below its original support position, thereby avoiding contact between the belt conveyor roller with the damaged bearing portion and the conveyor belt.

2. 2. The roller shaft support structure for a belt conveyor roller according to claim 1, wherein the roller shaft support portion of the roller shaft support means is formed in a U-shaped fitting groove that fits and supports the rotating member, and the rotating member is provided with a fitting portion with an arc-surface structure that fits into the U-shaped fitting groove, and the rotating member is supported by fitting the fitting portion with an arc-surface structure into the U-shaped fitting groove of the roller shaft support portion in a state where a predetermined bearing resistance is maintained, and a U-shaped roller shaft fitting groove is provided inside the fitting portion with an arc-surface structure that fits and supports the roller shaft from above to below in a state where it cannot rotate relative to the roller shaft.

3. 3. The roller shaft support structure for a belt conveyor roller according to claim 2, wherein a roller shaft drop-in groove of a predetermined depth for dropping the roller shaft downward is further provided in a state continuous with each other at the lower part of the U-shaped fitting groove for fitting and supporting the rotating member in the roller shaft support portion of the roller shaft support means.

4. 2. The roller shaft support structure for a belt conveyor roller according to claim 1, wherein the bottom surface of the roller shaft recess groove is formed as a tapered surface that is inclined in the vertical direction.

5. 5. A roller shaft support structure for a belt conveyor roller according to claim 1, 2, 3 or 4, characterized in that the rotating member is provided with an arm portion for detecting damage to the bearing portion of the roller shaft.

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