JP6667039B1 - Roller shaft support structure for conveyor rollers - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conventionally support a roller shaft end of a conveyor roller by simply dropping the chamfer forming portion into a concave groove of a roller stand. Therefore, when the roller cylinder eccentrically rotates during operation, the roller shaft vibrates accordingly. Easier to do. SOLUTION: As a roller shaft support portion provided on a roller stand 2, a first fitting support portion (corresponding to reference numeral 21) capable of non-rotatably supporting a roller shaft 11 and a lower half of a circumferential portion 16 of the roller shaft. A second fitting support portion (corresponding to reference numeral 3) capable of supporting the load applied to the shaft end 14 of the roller shaft from below by contacting the outer surface of the roller, and the second fitting support portion 3 includes a roller. While the shaft end 14 of the shaft is supported by the roller shaft supporting portion, the lower half outer surface of the circumferential portion 16 is held in contact with the left and right two places of the lower half outer surface of the circumferential portion 16 from both left and right sides. By providing the two contact portions Q, Q which can be formed, the outer surface of the lower half portion of the circumferential portion 16 of the roller shaft end 14 can be sandwiched from the left and right portions by the contact portions Q, Q. [Selection] Fig. 3

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller shaft supporting structure of a conveyor roller in which a roller shaft of the conveyor roller can be non-rotatably and detachably supported by a roller stand.

  Conveyor rollers are frequently used for running a belt of a belt conveyor. FIG. 10 shows a general example of a belt conveyor. This belt conveyor has an endless conveyor belt 9 on a carrier conveyor roller 1 located on the upper side and a return conveyor roller 1 ′ located on the lower side. And by driving one of the conveyor pulleys, the conveyor belt 9 wound endlessly can be circulated.

  The belt conveyor of the general example shown in FIG. 10 has substantially the same structure as that disclosed in, for example, Japanese Patent Application Laid-Open No. 2016-130169 (Patent Document 1). In the following description, the conveyor shown in FIG. The roller will be described as a conventional example.

  Each of the conveyor rollers 1 and 1 ′ in the belt conveyor of FIG. 10 (conventional example) uses a roller body 10 configured by rotatably mounting a roller cylinder 12 via a bearing (ball bearing) 13 on a roller shaft 11. The two shaft ends 14, 14 of the roller shaft 11 of the roller body 10 are supported by the roller stands 2, 2 in a non-rotatable state, respectively.

  In the description of the present application, the shaft end 14 of the roller shaft is a portion that protrudes outward from the longitudinal end face of the roller cylinder 12 and has a slightly length in the axial direction (for example, a length of about 15 mm). That is.

  The carrier-side conveyor roller 1 uses three short roller bodies 10, 10, 10 to bend the carrier side of the conveyor belt 9 in a valley-folded shape (inverted trapezoidal shape), and uses a base roller at an intermediate portion. In this case, two side rollers at both ends are continuously connected in an inclined state. The return-side conveyor roller 1 'employs one long roller body 10.

  In addition, the carrier-side conveyor roller 1 is made up of three short roller bodies 10, 10, 10, which are continuous with each other. Each of the short roller bodies 10 is connected to a roller shaft 11 via two bearings 13, 13, respectively. The roller cylinder 12 is rotatably mounted. The conveyor roller 1 having the three short roller bodies 10, 10, 10 as a set has the roller stands 2, 2 supporting both shaft ends 14, 14 of the roller shaft 11 of each short roller body 10, respectively. I have. In the following description, the three short roller bodies 10, 10, 10 are also simply referred to as roller bodies.

  The conveyor roller 1 (each roller body 10, 10, 10) for the belt conveyor of FIG. 10 is assembled to the roller stand 2 as follows. In the following description, a description will be given of a case where the carrier roller 1 is horizontally installed at the center as the conveyor roller.

  11 is an enlarged sectional view of a portion XI in FIG. 10, FIG. 12 is an enlarged view taken along the line XII-XII in FIG. 11, and FIG. 13 is a perspective view in a state where the conveyor roller 1 and the roller stand 2 are separated. is there.

  As shown in FIGS. 11 to 13, the conveyor roller 1 in FIG. 10 has a pair of chamfered portions (thinned portions) 15, 15 in which a portion facing the outer periphery is cut on the shaft end 14 of the roller shaft 11. On the other hand, a concave groove 21 </ b> A for supporting the roller shaft is formed in the upper part of the roller stand 2. As shown in FIGS. 12 and 13, the concave groove 21 </ b> A of the roller stand 2 is a U-shaped groove including left and right side surfaces 22, 22 and an arc-shaped bottom surface 23. In the following description, the shaft end 14 of the roller shaft 11 may be simply referred to as the roller shaft end 14, and the portion where the chamfered portions 15, 15 are formed may be referred to as a chamfered forming portion 15A.

  As shown in FIGS. 11 and 12, the conveyor roller 1 rotates the roller shaft 11 with respect to the roller stand 2 by dropping the chamfer forming portion 15A of the roller shaft end 14 into the concave groove 21A of the roller stand 2. We support inability.

  By the way, the conveyor roller 1 needs to be removed or repaired or replaced when the roller body 10 is detached from the roller stand 2 when some trouble (for example, poor rotation of the roller cylinder 12 or damage to the roller body 10) occurs. The roller shaft ends 14 and 14 can be attached to and detached from the concave grooves 21A of the roller stand 2, respectively. That is, as shown in FIGS. 12 and 13, the thickness M between the inner surfaces 15a, 15a of the chamfers 15, 15 provided near the roller shaft end 14 (normally, M = 14 mm). Then, the groove width N of the groove 21A of the roller stand 2 is slightly increased (for example, N = 14.5 to 15 mm), and the chamfered forming part 15A of each roller shaft end 14 is positioned from above with respect to each groove 21A. It can be fitted and removed upward.

  In a state where the chamfered forming portion 15A of the roller shaft end 14 is fitted in the groove 21A of the roller stand 2, as shown in FIG. 12, the right and left side surfaces 22, 22 of the groove 21A and the chamfered portions 15, 15 are formed. A slight gap (a gap of 0.5 to 1 mm in total on both sides) is formed between the inner surfaces 15a and 15a. The roller shaft end 14 is supported by the lower surface 15b of the chamfered portion 15A contacting the bottom surface 23 of the concave groove 21A. As shown in FIG. 12, the contact portion has a gentle arc shape and a relatively small height range H (H = approximately 3 mm) on the lower surface side of the roller shaft end 14.

On the other hand, as shown in FIG. 11, the roller body 10 of the conveyor roller 1 has a roller cylinder 12 rotatable with respect to a roller shaft 11 via a bearing (ball bearing) 13. After pressing the outer peripheral edge of the bearing holder 13a into the inner peripheral surface of the roller cylinder 12 while holding the outer peripheral edge of the bearing holder 13a, the outer peripheral edge of the bearing holder 13a is welded to the inner peripheral surface of the roller cylinder 12. It is attached. In this case, it is preferable that the axis of the roller shaft 11 and the axis of the roller cylinder 12 be completely concentric. However, due to the roundness of the roller cylinder 12, the dimensional error of various components, the mounting accuracy, and the like, The axis of the shaft 11 and the axis of the roller cylinder 12 may be slightly offset. Then, when the axis of the axis and the roller cylinder 12 b over La shaft 11 are displaced, the roller cylinder 12 is rotated while deflection in the radial direction with respect to the roller shaft 11 (non-rotating) (eccentrically rotated) Become like The causes of the eccentric rotation of the roller cylinder 12 with respect to the roller shaft 11 include, as described above, the eccentricity between the axis of the roller shaft 11 and the axis of the roller cylinder 12, as well as fluctuations in the transport amount and the roller cylinder. 12 and uneven thickness reduction of the roller cylinder 12.

  By the way, in a belt conveyor of this kind, the rotation speed of the roller cylinder 12 is generally operated at a relatively high speed of about 100 to 800 rotations per minute, but in such a case where the roller cylinder 12 rotates at a high speed, As described above, when the roller shaft 11 vibrates as the roller tube 12 rotates eccentrically due to the deviation between the shaft center of the roller shaft 11 and the shaft center of the roller tube 12, the roller shaft end 14 becomes concave. The collision with the inner surface of 21A is repeated.

JP 2016-130169 A

  By the way, in the roller shaft supporting structure of the conventional conveyor roller shown in FIGS. 10 to 13, since the chamfer forming portion 15A of the roller shaft end 14 is merely dropped into the concave groove 21A of the roller stand 2 as described above. The substantially retaining portion of the roller shaft end 14 by the concave groove 21A is a contact portion between the lower surface 15b of the chamfer forming portion 15A and the bottom surface 23 of the concave groove 21A (a gentle arc-like shape in the height range H of FIG. 12). The left and right side surfaces 22, 22 of the groove 21A merely guard the inner surfaces 15a, 15a of the left and right chamfers 15, 15 in a close state. In this manner, in the holding state of the roller shaft end 14 only by the concave groove 21A, the detachable ease of the roller shaft 11 and the blocking force in the rotation direction can be realized with respect to the concave groove 21A, respectively. The actual fixing force (damping force) is small.

  During operation, for some reason described above (for example, due to a deviation between the axis of the roller shaft 11 and the axis of the roller cylinder 12), the roller cylinder 12 rotates while swinging in the radial direction with respect to the roller shaft 11 ( When the roller shaft 12 is eccentrically rotated, the roller shaft 11 is vibrated in accordance with the eccentric rotation of the roller cylinder 12, but the roller shaft end 14 is formed by the concave groove 21A as in the above-described conventional roller shaft support structure of the conveyor roller. If the fixing force (damping force) is small, the roller shaft end 14 (chamfer forming portion 15A) repeatedly collides with the inner surface (left and right side surfaces 22, 22) of the groove 21A.

  As described above, in the roller shaft supporting structure of the conventional conveyor roller shown in FIGS. 10 to 13, when the roller cylinder 12 is eccentrically rotated with respect to the roller shaft 11 as described above, the concave groove 21 </ b> A with respect to the roller shaft end 14 is formed. Is small, the roller shaft end 14 (chamfer forming portion 15A) repeatedly collides against the inner surface of the concave groove 21A, so that noise due to the collision noise is generated and the working environment is reduced. In addition, there is a problem that the degree of wear of the roller shaft end 14 and the groove 21A is increased (the service life is shortened) because the roller shaft end 14 repeatedly collides with the groove 21A.

  In view of the above, the invention of the present application is to secure a configuration in which the roller shaft end of the roller body can be easily attached to and detached from the roller stand and the roller shaft is supported in a non-rotatable state, while securing the fixing force ( It is an object of the present invention to provide a roller shaft support structure for a conveyor roller in which a vibration suppression force) is increased so that the roller shaft does not easily vibrate relative to a roller stand even when the roller cylinder rotates eccentrically during operation.

  The present invention has the following configuration as means for solving the above problems. Although the present invention is directed to a roller shaft supporting structure of a conveyor roller, in the following description, the “roller shaft supporting structure of a conveyor roller” of each invention of the present application is simply expressed as “roller shaft supporting structure”. May be.

[Invention of claim 1 of the present application]
A conveyor roller to which the roller shaft support structure of the invention according to claim 1 of the present application is applied has a pair of chamfered portions in which a roller cylinder is rotatably mounted on a roller shaft via a bearing, and a shaft end of the roller shaft is shaved at an outer peripheral facing portion. The circumferential portion without the chamfered portion is provided so as to be shifted in the axial direction of the roller shaft, and the shaft end of the roller shaft is supported by a roller shaft supporting portion provided on a roller stand.

In the roller shaft supporting structure according to the first aspect of the present invention, in the conveyor roller, as a roller shaft supporting portion of the roller stand, a portion formed with a chamfered portion provided at the shaft end of the roller shaft is fitted to form the roller shaft. A first fitting support portion which is non-rotatable and can be detachably supported, and a circumferential portion provided at a shaft end of the roller shaft can be detachably fitted and is in contact with an outer surface of a lower half portion of the circumferential portion; A second fitting support portion capable of supporting a load applied to the shaft end of the roller shaft from below, wherein the first fitting support portion and the second fitting support portion are shifted in the axial direction of the roller shaft; together are provided at positions in the second fitting support portions, respectively contacting two left and right positions of the lower half outer surface of the circumferential portion in a state of being supported shaft end of the roller shaft to the roller shaft support portion Two contacts that can clamp the outer surface of the lower half of the circumference from both left and right sides The are provided, it is characterized in that.

  In the following description of the present application, the term "roller shaft end" may be simply referred to as "roller shaft end", and a pair of chamfers provided near the outer periphery of the roller shaft near the shaft end. The portion where the portion is formed may be simply referred to as a "chamfered forming portion", and the one in which a roller cylinder is rotatably mounted on a roller shaft via a bearing may be referred to as a "roller body".

  The first fitting support portion is dedicated to preventing the rotation of the roller shaft only to support the roller shaft in a non-rotatable manner, and the chamfer forming portion at the roller shaft end is fitted to the first fitting support portion. There is no supporting force for the roller shaft from below just by causing it to run.

  The second fitting support portion is dedicated to load support for supporting the load applied to the roller shaft end from below, and the circumferential portion of the roller shaft end is fitted to the second fitting support portion. By itself, there is no substantial rotation inhibiting force against the roller shaft end.

By the way, the chamfer forming portion of the roller shaft end fitted to the first fitting support portion and the circumferential portion of the roller shaft end fitted to the second fitting support portion are in the axial direction of the roller shaft. The first and second fitting support portions are provided at positions shifted in the axial direction of the roller shaft because the first and second fitting support portions are provided in a shifted state.

  According to the first aspect of the present invention, the right and left two contact portions provided on the second fitting support portion may each be a mere projection which only comes into contact with the outer surface of the circumferential portion of the roller shaft end. .

In the roller shaft support structure according to the first aspect of the present invention, the function of preventing the rotation of the roller shaft by the first fitting support portion and the function of supporting the load of the roller body by the second fitting support portion are provided by the roller shaft. Can be achieved individually at positions displaced in the axial direction .

  In the roller shaft supporting structure according to the first aspect of the present invention, a load due to the weight of the roller body itself and the weight of the conveyed material is applied to both shaft ends of the roller shaft during operation, and the load is below the circumferential portion of the roller shaft end. The half outer surface serves as a function of pressing the two contact portions of the second fitting support portion against each other, whereby a reaction force of the pressing force due to the load of the roller shaft end is generated at both contact portions. The reaction force generated at both contact portions acts as a function of clamping the outer surface of the lower half of the circumferential portion of the roller shaft end from both the left and right sides.

[Invention of claim 2 of the present application]
According to a second aspect of the present invention, in the roller shaft supporting structure according to the first aspect, the two contact portions of the second fitting support portion are in a state where a shaft end of a roller shaft is supported by the roller shaft supporting portion. At two positions in the lower half outer surface of the circumferential portion near the left and right outer ends , and a downward angle of 5 ° to 15 ° with respect to a horizontal line extending from the axis of the roller shaft to the axis radial direction passing through the axis. It is characterized in that they are brought into contact with each other.

  A downward load is applied to the roller shaft end due to the weight of the roller body itself, the weight of the conveyed object conveyed on the conveyor belt, and the like. The closer the position of contact with the outer surface of the lower half of the circumferential portion to the left and right outer ends, the greater the pinching force (position holding force) from the left and right to the roller shaft end by each contact portion (the reason will be described later). See the description in Examples).

In the state where the shaft end of the roller shaft is supported by the roller shaft support portion of the roller stand, the two contact portions of the second fitting support portion are the lower half of the circumferential portion. When the outer surface is brought into contact with each other at two positions near the left and right outer ends (a downward angle in the range of 5 ° to 15 ° with respect to a horizontal line in the axial direction passing through the axis from the axis of the roller axis) , The pinching force (position holding force) of the roller shaft end against the circumferential portion by both contact portions can be increased.

[Invention of claim 3 of the present application]
According to a third aspect of the present invention, in the roller shaft supporting structure according to the first or second aspect, the two contact portions of the second fitting support portion are each tangential to an outer surface of a circumferential portion at a roller shaft end. It is characterized in that it is a linear inclined surface that contacts in a state.

  The two inclined surfaces serving as the both contact portions are inclined (wedge-shaped inclined) toward the side inwardly approaching each other so that the distance gradually decreases downward. On the other hand, it is preferable to incline in a wedge shape within a relatively small angle range (for example, an angle of 5 ° to 15 °) (the reason will be described later in the embodiment section).

[Invention of claim 4 of the present application]
According to a fourth aspect of the present invention, in the roller shaft supporting structure according to any one of the first to third aspects, a part of a chamfered part provided on a roller stand as the first fitting support part cannot be rotated. A concave groove that can be fitted in a state is adopted, and the second fitting support portion has a space portion that can fit the circumferential portion of the roller shaft end from above and can support the circumferential portion from below. A shaft end receiving member is employed, and the shaft end receiving member is provided on the wall surface of the portion of the roller stand where the concave groove serving as the first fitting support portion is formed , so that the width center line of the space portion is the width center of the concave groove. It is characterized in that it is attached so as to match the line and the axial direction of the roller shaft .

  By the way, as the concave groove serving as the first fitting support portion in claim 4 of the present application, the existing groove provided in the roller stand (the concave groove of 21A in the conventional example shown in FIGS. 10 to 13) can be used as it is. The function of the groove (reference numeral 21 in the embodiment) used in claim 4 of the present invention is different from that of the conventional groove (reference numeral 21A). That is, the concave groove 21A of the conventional example shown in FIGS. 10 to 13 has the function of preventing the rotation of the roller shaft and the function of supporting the load at the roller shaft end when the chamfered portion at the roller shaft end is dropped into the groove 21A. Although it has both, the concave groove (reference numeral 21) used in claim 4 of the present application has only the function of preventing the rotation of the roller shaft and does not have the function of supporting the load at the end of the roller shaft. This is explained in the examples section).

  On the other hand, the shaft end receiving member serving as the second fitting support portion is formed as a separate member from the roller stand, and the circumferential portion of the roller shaft end can be fitted from above and the circumferential portion can be lowered. It has a space that can be supported from above.

  According to the fourth aspect of the present invention, the first and second fitting support portions are provided on the roller stand by attaching the shaft end receiving member to the existing groove forming portion of the roller stand. be able to.

[Effect of the invention of claim 1 of the present application]
In the roller shaft supporting structure according to the first aspect of the present invention, a load applied to a roller shaft supporting portion of the roller stand and a first fitting support portion for preventing the roller shaft from rotating so as to prevent the roller shaft from rotating, and a load applied to the roller shaft end. And a second fitting support portion for supporting the load from below , and the first fitting support portion and the second fitting support portion are provided at positions displaced in the axial direction of the roller shaft. Therefore, there is an effect that the roller shaft rotation preventing function and the load supporting function can be reliably achieved by sharing the first fitting supporting portion and the second fitting supporting portion.

  According to the first aspect of the present invention, the second fitting support portion is provided with two contact portions capable of holding the outer surface of the lower half portion of the circumferential portion of the roller shaft end from both left and right sides. Since the contact portion clamps the outer surface of the lower half of the circumferential portion from both the left and right sides in a state where the roller shaft end is supported by the roller shaft support portion of the roller stand, a function of holding the position of the roller shaft end from the left and right is generated. It can be done. This means that even if the roller cylinder of the roller body rotates eccentrically with respect to the roller axis, the roller axis can be prevented from vibrating with the eccentric rotation of the roller cylinder.

  Therefore, in the roller shaft supporting structure according to the first aspect of the present invention, since the vibration of the roller shaft can be suppressed as described above, the noise (vibration of the roller shaft end and the roller stand) caused by the vibration of the roller shaft end during operation can be obtained. In addition to suppressing the sound of collision with the roller shaft support, the roller shaft end does not strongly collide with the roller shaft support, so that the roller shaft end and the roller shaft support are less likely to be damaged (the service life becomes longer). effective.

[Effect of the invention of claim 2 of the present application]
According to a second aspect of the present invention, in the roller shaft supporting structure of the first aspect, the roller shaft is supported in a state in which both contact portions of the second fitting support portion are supported at the shaft end of the roller shaft by the roller shaft supporting portion. A downward angle in the range of 5 ° to 15 ° with respect to a horizontal line extending from the axis of the roller shaft to a radial direction passing through the axis at a position closer to the left and right outer ends on the outer surface of the lower half of the end circumferential portion. However, as the positions at which the two contact portions come into contact with the outer surface of the lower half of the circumferential portion are closer to the left and right outer ends, respectively, the roller shaft end by the respective contact portions is set. And the holding force (position holding force) from the left and right with respect to.

  Therefore, in the roller shaft support structure according to the second aspect of the present invention, the pinching force (position holding force) of the roller shaft end against the circumferential portion by the two contact portions can be further increased, so that the roller shaft end during operation is increased. This has the effect of further suppressing vibration.

[Effect of the invention of claim 3 of the present application]
According to a third aspect of the present invention, in the roller shaft support structure according to the first or second aspect, the two contact portions of the second fitting support portion are each in a tangential state with respect to an outer surface of a circumferential portion at an end of the roller shaft. To form a linear inclined surface that comes into contact.

  When both contact portions of the second fitting support portion are formed as linear inclined surfaces as in the invention of claim 3, in addition to the effects of the above-described claims 1 and 2, the forming process of each contact portion is performed. Even if the contact portion is worn (for example, recessed) due to the load applied to the roller shaft end or the vibration effect of the roller shaft end due to the eccentric rotation of the roller cylinder, the pinching force (position Holding force) can be favorably maintained without lowering.

[Effect of the invention of claim 4 of the present application]
According to a fourth aspect of the present invention, in the roller shaft supporting structure according to any one of the first to third aspects, the roller stand is provided on the roller stand as a first fitting support portion that is in charge of a rotation preventing function of the roller shaft. An existing concave groove is employed, and a shaft end receiving member formed as a separate member is employed as a second fitting support portion which is in charge of a load supporting function applied to the roller shaft end, and the shaft end receiving member is formed by a concave in the roller stand. It is attached to a portion where a groove (first fitting support portion) is formed.

  In the roller shaft supporting structure according to the fourth aspect of the present invention, the shaft end receiving member serving as the second fitting support portion is separately manufactured, and the shaft end receiving member is attached to the concave groove forming portion of the roller stand. In addition to the effects of the first to third aspects, there is an effect that a function of suppressing the vibration of the roller shaft can be provided to the existing conveyor roller.

It is a front view of the conveyor roller provided with the roller shaft support structure of the example of this application. FIG. 2 is an enlarged vertical sectional view of a portion II in FIG. 1. FIG. 3 is a view taken in the direction of arrows III-III in FIG. 2. FIG. 4 is an enlarged view of a portion IV in FIG. 3. FIG. 5 is an enlarged sectional view taken along a line VV in FIG. 2. FIG. 3 is a partial perspective view of the conveyor roller of FIG. 2 in a state where a roller body and a roller stand are separated. FIG. 7 is a perspective view of a state where the roller body is assembled to a roller stand from the state of FIG. 6. FIG. 2 is an enlarged view of a return-side conveyor roller in the belt conveyor of FIG. 1. FIG. 9 is an enlarged view as viewed in the direction of arrows IX-IX in FIG. 8. It is a front view of the conventional conveyor roller. FIG. 11 is an enlarged vertical sectional view of a portion XI in FIG. 10. FIG. 12 is an enlarged view taken along the arrow XII-XII in FIG. 11. FIG. 12 is a perspective view of a state where a roller body and a roller stand in the conveyor roller of FIG. 11 are separated.

[Example]
Hereinafter, the roller shaft supporting structure of the conveyor roller according to the embodiment of the present invention will be described with reference to the attached FIGS. In the description of the embodiments below, the “roller shaft support structure of the conveyor roller” of the present application is simply referred to as “roller shaft support structure”.

  As shown in FIG. 1, the conveyor roller 1 targeted in the embodiment of the present invention is mainly used for running a belt of a belt conveyor. In the belt conveyor shown in FIG. 1, an endless conveyor belt 9 is wound around a carrier-side conveyor roller 1 located above and a return-side conveyor roller 1 'located below, and one of the conveyor rollers is driven. Thus, the conveyor belt 9 wound endlessly can be circulated.

  By the way, in the conveyor roller 1 of the embodiment of the present application (FIGS. 1 to 9), members (or portions) denoted by the same reference numerals as those of the conveyor roller 1 of the conventional example (general example) shown in FIGS. This is the same as the conventional example. In the conveyor roller 1 used in the embodiments of the present application, the description in the section of the above-mentioned “Background Art” is used for the parts not described in the section of this embodiment.

  The conveyor roller 1 used in the embodiment of the present invention also supports the roller shaft 11 so as not to rotate with respect to the roller stand 2, while the roller shaft 11 is fixed to the roller stand 2 to repair or replace the roller body 10. It is necessary to attach it detachably.

  In the roller shaft support structure of this embodiment, a concave groove (U-shaped groove) 21 directly formed on the roller stand 2 is employed as a means for supporting the roller shaft 11 so as not to rotate with respect to the roller stand 2. The shaft end receiving member 3 attached to the roller stand 2 is employed as means for detachably supporting the roller stand 11 with respect to the roller stand 2.

  In the embodiment shown in FIGS. 1 to 9, the groove 21 directly formed on the roller stand 2 corresponds to the first fitting support portion in the claims, and the shaft attached to the roller stand 2. The end receiving member 3 corresponds to a second fitting support in the claims. In the description of this embodiment, the first fitting support in the claims is called a concave groove 21, and the second fitting support in the claims is called a shaft end receiving member 3.

  The conveyor roller 1 of this embodiment also has a pair of chamfered portions (thickened portions) 15, 15 at positions opposed to the outer periphery of the shaft end 14 of the roller shaft 11 as shown in FIGS. 2 to 7, A concave groove 21 for preventing rotation of the roller shaft is formed in an upper portion of the roller stand 2.

  As shown in FIGS. 2 to 5 and FIG. 7, the conveyor roller 1 drops the chamfer forming portion 15 </ b> A of the roller shaft end 14 into the concave groove 21 of the roller stand 2, thereby transferring the roller shaft 11 to the roller stand 2. On the other hand, the roller shaft end 14 is supported so as not to be rotatable, while the chamfer forming portion 15A of the roller shaft end 14 can be dropped into the concave groove 21 of the roller stand 2 from above or removed upward.

Also in the conveyor roller 1 used in this embodiment, a portion of the roller shaft end 14 outside the chamfered forming portion 15A is a circumferential portion 16 having no chamfered portion. Accordingly, the chamfer forming portion 15A and the circumferential portion 16 are located at positions shifted from each other in the axial direction of the roller shaft 11.

  Incidentally, the groove 21 of the roller stand 2 used in the embodiment of the present invention shown in FIGS. 1 to 9 is the same as the groove 21A of the roller stand 2 used in the conventional example shown in FIGS. The same is used in terms of size, but different in terms of function.

  That is, in the conventional example shown in FIGS. 10 to 13, when the chamfered portion 15A of the roller shaft end 14 is dropped into the groove 21A, the chamfered portion 15A is protected by the left and right side surfaces 22, 22 of the groove 21A. As a result, the roller shaft 11 is supported so as not to rotate, and at the same time, the lower surface 15b of the chamfered portion 15A contacts the bottom 23 of the groove 21A to support the load applied to the roller shaft end 14 at the bottom 23 of the groove 21A. In the embodiment of the present invention shown in FIGS. 1 to 9, the concave groove 21 of the roller stand 2 only supports the rotation of the roller shaft 11 and supports the load applied to the roller shaft end 14 as described later. (The load applied to the roller shaft end 14 is supported by the shaft end receiving member 3 described later).

  In order to smoothly rotate the roller cylinder 12 with respect to the roller axis 11, it is preferable that the axis of the roller axis 11 and the axis of the roller cylinder 12 be completely concentric. In some cases, the axis of the roller shaft 11 and the axis of the roller cylinder 12 may be slightly shifted due to dimensional errors and mounting accuracy of various constituent members. If the axis of the roller shaft 11 is displaced from the axis of the roller cylinder 12, the outer surface of the roller cylinder 12 rotates while oscillating in the radial direction with respect to the roller shaft 11 (non-rotation) (rotates eccentrically). There is a background.

  On the other hand, in the conveyor roller 1 of this embodiment, the thickness M (FIGS. 3 to 5) of the chamfer forming portion 15A is set to 14 mm, and the groove width N of the groove 21 of the roller stand 2 is set to 14.5 to 15 mm. I have. When the chamfered portion 15A of the roller shaft end 14 is fitted in the groove 21 of the roller stand 2, the left and right side surfaces 22, 22 of the groove 21 are enlarged as shown in FIGS. Since a slight gap (a gap of 0.5 to 1 mm in total on both sides) is formed between each chamfered portion 15 and each inner surface 15a of the chamfered portion 15, if the roller cylinder 12 is eccentrically rotated during operation, it is left as it is (conventionally). The roller shaft 11 also vibrates with the eccentric rotation of the roller cylinder 12 (in the example), and the chamfered portion 15A (thickness M) of the roller shaft end 14 vibrates within the groove width N of the concave groove 21 (collision). Sounds).

  Therefore, in the roller shaft supporting structure according to the embodiment of the present invention, as shown in FIGS. 3 to 7, the circumferential portion 16 without the chamfered portion 15 near the roller shaft end 14 is formed at the portion where the concave groove 21 is formed in the roller stand 2. The shaft end receiving member 3 which can be detachably fitted in the vertical direction and which can support the circumferential portion 16 from below is attached.

  The shaft end receiving member 3 employs a U-shaped frame body 30 that is open upward when viewed from the axial direction of the roller shaft 11. The U-shaped frame 30 is formed by connecting the lower ends of the left and right sides 32, 32 with a bottom 33.

  A space 31 is provided between both side portions 32 of the U-shaped frame 30 so that the circumferential portion 16 (the portion without the chamfered portion 15) of the roller shaft end 14 can be vertically inserted and removed. The opposing surfaces of the side portions 32, 32 forming the space portion 31 are such that the upper halves thereof are vertical surfaces 34, 34, respectively, and are slightly wider than the outer diameter of the circumferential portion 16 of the roller shaft end 14. Thus, the lower half portions are linearly inclined surfaces 35, 35 inclined inward (wedge-shaped), respectively.

  The circumferential portion 16 of the roller shaft end 14 can be inserted into and removed from the upper half (the vertical plane 34 forming portion) of the space 31.

  On the other hand, since the two inclined surfaces 35 in the lower half of the space 31 are inclined inward (wedge-shaped), the gap between the inclined surfaces 35 and 35 is a circle of the roller shaft end 14 in the middle. When the circumferential portion 16 of the roller shaft end 14 is dropped into the space 31, the outer surface of the lower half portion of the circumferential portion 16 is formed by the two inclined surfaces 35, 35 when the circumferential portion 16 of the roller shaft end 14 is dropped into the space 31. Each part can be supported. At this time, each position (symbols Q and Q) at which the lower half outer surfaces (two right and left portions) of the circumferential portion 16 of the roller shaft end 14 contact the inclined surfaces 35 and 35 is a contact portion in the claims. The contact portions are located at support positions Q and Q (see FIGS. 3 to 5) for receiving the circumferential portion 16 of the roller shaft end 14. In the following description, the support position Q for receiving the circumferential portion 16 of the roller shaft end 14 may be simply referred to as the circumferential portion support position Q.

  As shown in FIGS. 2 to 7, the shaft end receiving member 3 is provided on the wall surface (the wall surface far from the roller body 10 in the illustrated example) of the roller stand 2 where the concave groove 21 is formed. In a state where the width center line coincides with the width center line of the concave groove 21 and the axial direction of the roller shaft 11, it is fixed by appropriate fixing means (welding in the illustrated example). At this time, as shown in FIGS. 3 to 5, the shaft end receiving member 3 is held in a state where the lower end 16 a of the circumferential portion 16 of the roller shaft end 14 is located above the bottom surface 23 of the groove 21 of the roller stand 2. It is fixed (welded) to the roller stand 2. The shaft end receiving member 3 is attached to the roller stands 2 on each side that supports the both shaft ends 14 of the roller shaft 11, respectively.

As described above, when the shaft end receiving member 3 is attached to the wall surface of the concave groove 21 forming portion of the roller stand 2, the concave groove 21 serving as the first fitting support portion and the shaft serving as the second fitting support portion are provided. The end receiving member 3 is provided at a position displaced in the axial direction of the roller shaft 11.

  By the way, in this embodiment, the shaft end receiving member 3 is fixed to the wall surface of the roller stand 2 far from the roller body 10, but the shaft end receiving member 3 is located between the roller stand 2 and the end surface of the roller cylinder 12. When the space for installing 3 is secured, the shaft end receiving member 3 may be fixed to the wall surface of the roller stand 2 on the roller body 10 side. At this time, the circumferential portion 16 between the chamfer forming portion 15 </ b> A at the roller shaft end 14 and the end surface of the roller cylinder 12 is fitted into the space 31 of the shaft end receiving member 3.

  In a state where the roller body 10 is mounted on the roller stands 2 and 2 with the shaft end receiving member 3, since the chamfer forming portion 15 </ b> A of the roller shaft end 14 is fitted into the concave groove 21 of the roller stand 2, Although the shaft 11 cannot rotate with respect to the roller stands 2, 2, both roller shaft ends 14, 14 can be removed upward with respect to the concave groove 21 of the roller stand 2, 2 and the shaft end receiving member 3. Therefore, when the roller body 10 is repaired or replaced, the roller body 10 can be easily removed.

  By the way, the respective inclined surfaces 35 of the shaft end receiving member 3 supporting the outer surface of the circumferential portion 16 of the roller shaft end 14 are in tangential contact with the outer surface of the circumferential portion 16, respectively. As the positions where the inclined surfaces 35 and 35 come into contact with the outer surface of the lower half portion of the circumferential portion 16 (the circumferential position support positions Q and Q) are closer to the left and right outer ends, respectively, the inclined surfaces 35 and 35 are used. The holding force (position holding force) from the left and right with respect to the roller shaft end 14 increases. That is, since a downward load is applied to the roller shaft end 14 due to the weight of the roller body 10 itself, the weight of the conveyed object conveyed on the conveyor belt 9, and the like, the above-described circumferential portions of the shaft end receiving member 3 An urging force is applied to the support positions Q, Q to push the inclined surfaces 35, 35 outward, respectively, but the reaction force (position holding force) to the urging force is such that the inclined surfaces 35, 35 face the vertical plane. It becomes stronger as it gets closer (a detailed example will be described later).

  In this embodiment, as shown in FIGS. 3 to 5, each inclined surface 35 of the shaft end receiving member 3 is in contact with the outer surface of the circumferential portion 16 of the roller shaft end 14 (each circumferential portion). The support positions Q, Q) are set at positions at a predetermined small angle a (in the illustrated example, a = 10 °) from the axis P of the roller shaft 11 to a horizontal line L passing through the axis P. However, in this case, each of the left and right inclined surfaces 35, 35 is inclined downward (toward a wedge shape) with a predetermined small angle (10 °, the same angle as a) with respect to the vertical plane. .

  In this manner, when the inclined surfaces 35, 35 of the shaft end receiving member 3 are inclined downward (wedge-shaped inclined) toward the vertical surface at a predetermined small angle a with respect to the vertical plane, both inclined surfaces 35, 35 are inclined. When the left and right outer surfaces of the lower half of the roller shaft end 14 are supported at two positions, a downward load applied to the roller shaft end 14 is clamped by the inclined surface contact portions (the above-described circumferential portion support positions Q, Q). The degree of force (position holding force) can be increased.

By the way, as shown in FIGS. 4 and 5, each of the circumferential portion support positions Q, Q is set so that the downward angle a with respect to a horizontal line L extending from the axis P of the roller shaft 11 to the axis radial direction passing through the axis P. It is preferable that the position is set to a position in a small angle range of about 5 ° to 15 °. In this way, each circumferential portion support position Q is set at a small angle of 5 ° to 15 ° with respect to the horizontal line L extending from the axis P of the roller shaft 11 to the axis radial direction passing through the axis P. If it is set to be in the range, the downward inclination angle of the inclined surface 35 is in a small angle range of 5 ° to 15 ° with respect to the vertical plane.

Then, the way, about 5.7 times in the case of 5 ° downward inclination angle of the inclined surface 35 with respect to the vertical plane (sin5 ° = 0.087) of the load applied to the roller shaft end 14 in the circumferential portion support position Q When a position holding force of (１ ／ × 0.087) is obtained and the inclination angle of the inclined surface 35 is 10 ° (sin10 ° = 0.173), the load applied to the roller shaft end 14 at the circumferential portion supporting position Q is reduced. When a position holding force of about 2.8 times (1/2 × 0.173) is obtained, and the inclination angle of the inclined surface 35 is 15 ° (sin15 ° = 0.258), the roller shaft end is located at the circumferential portion supporting position Q. A position holding force of about 1.9 times (1/2 × 0.258) of the load applied to the position 14 is obtained.

  As described above, when a clamping force (position holding force) larger than the load applied to the roller shaft end 14 is obtained at each of the circumferential portion support positions Q, Q, the roller cylinder 12 vibrates relative to the roller shaft 11 during operation. However, the vibration of the roller shaft 11 with the eccentric rotation of the roller cylinder 12 can be suppressed, whereby the roller shaft ends 14 hardly vibrate in the concave grooves 21 of the roller stand 2.

  Therefore, in the roller shaft supporting structure according to the embodiment of the present application, since the vibration of the roller shaft 11 can be suppressed as described above, the noise caused by the vibration of the roller shaft end 14 during the operation (the roller shaft end 14 and the roller stand 2). And the roller shaft end 14 does not strongly collide with the groove 21 of the roller stand, so that the roller shaft end 14 and the groove 21 are less likely to be worn out (durable period). Is longer).

  In this embodiment, as shown in an enlarged view in FIGS. 8 and 9, a vibration suppressing structure of the roller shaft 11 by the shaft end receiving member 3 is also used for the return side conveyor roller 1 '.

  The roller body 10 of the return-side conveyor roller 1 ′ supports both shaft ends 14, 14 of the roller shaft 11 from above with left and right support members 27, 27. In the return-side conveyor roller 1 ′, By removing the support members 27 from the base of the conveyor roller, the support members 27 can be removed from the roller shaft ends 14. In the return-side conveyor roller 1 ', the support members 27, 27 correspond to the roller stands 2, 2 of the carrier-side conveyor roller 1.

  As shown in FIGS. 8 and 9, the supporting members 27 on each side are formed with a groove 21 for holding the chamfer forming portion 15 </ b> A provided near the roller shaft end 14 in a non-rotatable manner. The roller shaft 11 is non-rotatably supported by fitting the chamfer forming portion 15A into the groove 21.

  In each of the support members 27, 27, a shaft end receiving member 3 is attached to a wall surface (outer wall surface) of a portion where the concave groove 21 is formed. The same ones are used. Since the detailed configuration of the shaft end receiving member 3 and the relationship between the shaft end receiving member 3 and the roller shaft end 14 are substantially the same as those of the carrier side conveyor roller 1, the carrier side conveyor roller 1 will be described. The description of the roller 1 is used.

  Also in this return side conveyor roller 1 ', the roller body 10 is detachable from the support members 27, 27, and the roller shaft 11 is not rotatable with respect to the support members 27, 27. The roller shaft end 14 has two inclined surfaces 35, 35 of the shaft end receiving member 3 near the outer end of the lower half of the circumferential portion 16 (circumferential portion support positions Q, Q as contact portions). As in the case of the carrier-side conveyor roller 1, even if the roller cylinder 12 rotates eccentrically during operation, the roller shaft 11 can be suppressed from vibrating with the eccentric rotation of the roller cylinder 12 ( Each roller shaft end 14 is less likely to vibrate in the groove 21 of the roller stand 2).

  In the embodiments of FIGS. 1 to 9, the right and left inclined surfaces 35, 35 of the space 31 of the shaft end receiving member 3 are used as the contact portions in the claims, but in other embodiments, As the contact portion, if it can contact the lower half outer surface (two locations on the left and right) of the circumferential portion 16 of the roller shaft end 14 and can support the roller shaft end 14 from below, it is merely a protrusion. Is also good.

  1 is a conveyor roller, 2 is a roller stand, 3 is a shaft end receiving member (a member for forming a second fitting support), 10 is a roller body, 11 is a roller shaft, 12 is a roller cylinder, 13 is a bearing, and 14 is a bearing. Shaft end (roller shaft end), 15 is a chamfered portion of the roller shaft end, 15a is a back surface of the chamfered portion, 15A is a chamfered forming portion, 16 is a circumferential portion of the roller shaft end, 21 is a concave groove (first fitting). 22 is a side edge of the groove, 30 is a U-shaped frame, 31 is a space, 32 is a side, 35 is an inclined surface, P is the axis of the roller shaft, and L is the axis P. The passing horizontal line, Q, is the circumferential portion support position (contact portion).

Claims (4)

A roller cylinder is rotatably mounted on the roller shaft via a bearing, and a pair of chamfers obtained by shaving the outer peripheral opposing portion on the shaft end of the roller shaft and a circumferential portion without the chamfer are formed in the axial direction of the roller shaft. In the conveyor roller which is provided in a shifted state, and further configured by supporting the shaft end of the roller shaft with a roller shaft supporting portion provided on a roller stand,
The roller shaft supporting portion of the roller stand is a first fitting supporting portion which is capable of non-rotatably and detachably supporting the roller shaft by fitting a chamfered portion provided at the shaft end of the roller shaft. A circumferential portion provided at the shaft end of the roller shaft can be detachably fitted, and a load applied to the shaft end of the roller shaft can be supported from below by contacting the lower half outer surface of the circumferential portion. And two mating support portions,
The first fitting support portion and the second fitting support portion are provided at positions shifted in the axial direction of the roller shaft, respectively.
The second fitting support portion contacts the left and right portions of the lower half outer surface of the circumferential portion with the shaft end of the roller shaft supported by the roller shaft support portion, respectively. Two contact portions capable of sandwiching the outer surface of the lower half of the portion from both left and right sides,
A roller shaft support structure for a conveyor roller. The two contact portions of the second fitting support portion are located near left and right outer ends on a lower half outer surface of the circumferential portion in a state where the shaft end of the roller shaft is supported by the roller shaft support portion. A downward angle from a shaft center of the roller shaft to a horizontal line in a shaft radial direction passing through the shaft center at two points in a range of 5 ° to 15 ° , respectively.
The roller shaft support structure for a conveyor roller according to claim 1, wherein: The two contact portions of the second fitting support portion are linear inclined surfaces that are in tangential contact with the outer surface of the circumferential portion at the shaft end of the roller shaft, respectively.
The roller shaft support structure for a conveyor roller according to claim 1 or 2, wherein: As the first fitting support portion, a concave groove that can be fitted in a non-rotatable state with the chamfered portion formed on the roller stand is adopted,
A shaft end receiving member having, as the second fitting support portion, a space portion into which the circumferential portion of the shaft end of the roller shaft can be fitted from above and a lower half outer surface of the circumferential portion can be supported from below; While adopting,
The shaft end receiving member, the wall surface of the forming portion of the groove in the roller stand, the width center line of the space portion is mounted in a state that matches the axial width centerline and the roller axis of the groove ,
The roller shaft support structure of a conveyor roller according to any one of claims 1 to 3, characterized in that:

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