Roller stand and idler device equipped with same

Abstract

To provide a roller stand which allows a roller to be replaced without lifting a belt by sliding the roller laterally, and which allows a bracket part of the roller to be easily and quickly attached to and detached from a predetermined position. [Solution] The roller stand 1 comprises a bracket portion 11, a receiving groove 12 provided laterally on the bracket portion for receiving the roller shaft 20 of the roller 2 inserted through the insertion opening, and a key plate 13 rotatably attached to the bracket portion and having a stop portion 135 for stopping the roller shaft 20 inserted into the receiving groove 12 at a predetermined rotation angle.

Description

[Technical field]

[0001] This invention relates to a roller stand and an idler device equipped with the same. More specifically, it relates to a roller stand that allows the roller to be replaced by sliding the roller sideways without lifting the belt with the roller, and that allows the roller bracket to be easily and quickly attached to and detached from a predetermined position, and an idler device equipped with the same. [Background technology]

[0002] In belt conveyors that are primarily used to transport bulk materials (ore, soil, coal, cement, grains, etc.), the belts on the carrier side and the return side are connected endlessly to perform continuous transport work.

[0003] The idler device that supports the belt on the carrier side usually uses three rollers and transports the belt while deforming it into a roughly U-shaped cross section, while the idler device that supports the belt on the return side usually uses one roller and supports the belt in a flat state.

[0004] Furthermore, the rollers attached to the idler device on the return side come into contact with the belt surface (front side) that is in direct contact with the various transported items on the carrier side, supporting the load of the belt while rotating at high speed. As a result, they are easily soiled by falling ore and dust generated by the transported items, and require more frequent replacement than the rollers on the carrier side.

[0005] However, typical rollers are made of metal and are quite heavy, and their cylindrical shape means that there are almost no handholds, making them difficult to handle, and there is also the risk of them being dropped during the replacement process, making it not an easy task.

[0006] In addition, because the roller shaft of the support bracket that supports the roller has a vertical groove, the roller must be lifted up when replacing it. Furthermore, the roller is also subjected to the weight of the belt, and because the return side is lower, the worker must work in an awkward position, which places a great burden on the worker.

[0007] Therefore, a roller stand has been proposed in which a receiving groove in the support bracket is provided in the horizontal direction so that the roller does not have to be lifted when replacing the roller (see Patent Document 1). This conventional roller stand is structured so that after the roller shaft is inserted into the specified position along the receiving groove, the roller shaft is fixed with a fastener fixed with a bolt to prevent the roller shaft from moving sideways. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2019-85209 A Summary of the Invention [Problem to be solved by the invention]

[0009] However, conventional roller stands have the following problems. In other words, when replacing the rollers, it was time-consuming to attach and remove the bolts in two places (four places on each side), and deterioration over time could cause the bolts securing the fasteners to rust, making it difficult to remove the rollers.

[0010] Furthermore, even if the bolts and fasteners could be removed, there were many factors that made the roller replacement process time-consuming, such as the fact that the worker would often drop these parts and have to search for them again.

[0011] The present invention has been devised in consideration of the above points, and aims to provide a roller stand that allows the rollers to be replaced by sliding the rollers sideways without lifting the belt with the rollers, and an idler device equipped with the same, in which the roller bracket part can be easily and quickly attached to and detached from the designated position. [Means for solving the problem]

[0012] [1] In order to achieve the above object, the present invention is a roller stand comprising a bracket portion, a receiving groove provided laterally on the bracket portion for receiving a roller shaft of a roller inserted through an insertion port, and a key plate rotatably attached to the bracket portion and having a stop portion for stopping the roller shaft inserted into the receiving groove at a predetermined rotation angle.

[0013] The roller stand of the present invention is equipped with a bracket portion and a receiving groove that is provided horizontally on the bracket portion and receives the roller shaft of the roller inserted through the insertion port. Therefore, the roller shaft can be inserted horizontally along the receiving groove and received by the bracket portion.

[0014] In addition, the roller shaft is rotatably attached to the bracket portion and has a key plate having a stopper portion for stopping the roller shaft inserted into the receiving groove at a predetermined rotation angle. Therefore, the roller shaft inserted into the receiving groove and positioned at a predetermined location can be stopped so as not to move by the stopper portion of the key plate rotated at the predetermined rotation angle, thereby rotatably supporting the roller.

[0015] Furthermore, by rotating the key plate in the opposite direction from the state in which the roller is rotatably supported, and releasing the state in which the roller shaft is stopped by the stopper, the roller shaft can be moved along the receiving groove, and the roller can be removed.

[0016] In this way, when installing and removing the rollers, the roller stand of the present invention only requires moving the roller shaft sideways, i.e. horizontally, along the receiving groove, and does not require moving it up and down. Therefore, when replacing the rollers, it is possible to slide the belt sideways without lifting it with the rollers.

[0017] As a result, the roller stand of the present invention is a roller stand that allows the rollers to be replaced by sliding them sideways without lifting the belt with the rollers, and the roller bracket part can be easily and quickly attached to and removed from the designated position.

[0018] [2] The roller stand of the present invention may also be configured so that the bracket portion has a mounting portion for mounting to a specified frame of a belt conveyor.

[0019] In this case, the bracket part has a mounting part for mounting to a specified frame of the belt conveyor, and the bracket part for supporting the rollers and the mounting part for mounting the bracket part to the frame are functionally separated. Therefore, the functions of the bracket part and the mounting part are fully exerted, and the specified functionality as a roller stand can be secured.

[0020] [3] The roller stand of the present invention can also be configured so that the key plate has a U-shape with a specified portion of the inner edge serving as the stopper, and is adapted to rotate in a direction so as to cover the receiving groove from above.

[0021] In this case, the key plate is U-shaped with a specified location on the inner edge acting as the stopper, and is designed to rotate in a direction so as to cover the receiving groove from above. The key plate therefore moves in a manner that embraces the roller shaft from above, allowing the stopper to abut against the roller shaft in the embraced state.

[0022] In addition, the stopper can be provided on the straight part of the tip side member that forms the U-shape of the key plate. This makes it possible to make the contact area between the stopper and the circular outer circumferential surface of the roller shaft very small, allowing the contact parts to move freely. Therefore, mutual deformation or damage of the key plate and the roller shaft due to vibration or impact applied to the roller shaft is unlikely to occur.

[0023] [4] The roller stand of the present invention may be configured as the roller stand of the above [3], in which the member on the tip side of the key plate is formed to be longer by a predetermined length than the member on the base side.

[0024] In this case, the member on the tip side of the key plate is formed to be a specified length longer than the member on the base side, so the key plate tends to be heavier at the tip side and is easier to rotate in the direction to embrace the roller shaft. This causes a load to be continuously applied to the key plate to rotate in the direction to embrace the roller shaft, preventing the key plate from rotating in the opposite direction due to vibration or shock applied to the roller shaft and coming off.

[0025] [5] The roller stand of the present invention may be configured as the roller stand of the above [3], in which the pivot center of the key plate is provided at a predetermined position lower than the center of the receiving groove in the height direction.

[0026] In this case, the pivot center of the key plate is located at a specified position lower than the center of the height of the receiving groove, so that when the roller shaft is inserted into the receiving groove, it is located at a position lower than the center of the roller shaft.

[0027] In other words, since the center of rotation of the key plate is offset below the center of the roller shaft, when the key plate rotates in the opposite direction to the direction in which it embraces the roller shaft, i.e., in the direction in which it slips off the roller shaft, the retaining portion that is approximately in contact with the roller shaft can move not only in the direction away from the roller shaft upward, but also along the circular outer peripheral surface of the roller shaft while remaining in close proximity to the roller shaft.

[0028] As a result, even if vibration or impact acts on the roller shaft and the key plate attempts to rotate in a direction that would cause it to come off the roller shaft, the stopper portion is located in close proximity to the outer peripheral surface of the roller shaft and is therefore more likely to come into contact with the outer peripheral surface, making it more difficult to rotate, and as a result, the key plate is less likely to come off.

[0029] Furthermore, if the pivot point of the key plate were located at a position higher than the center of the roller shaft, when the roller shaft attempts to move toward the insertion port and the key plate attempts to rotate in a direction that disengages it from the roller shaft, the retaining portion will immediately move away from the roller shaft as soon as it begins to rotate, which will encourage the roller shaft to fall off.

[0030] However, if the pivot point of the key plate is located at a specified position lower than the center of the roller shaft, even if the roller shaft attempts to move toward the insertion port, as described above, the key plate will tend to rotate in the direction to cover the roller shaft, and will be less likely to rotate in the direction to come out, thereby preventing the roller shaft from falling off.

[0031] [6] The roller stand of the present invention may be configured so that a temporary fixing means is provided at the rotation center of the key plate for temporarily fixing the key plate at a predetermined rotation angle.

[0032] In this case, a temporary fixing means for temporarily fixing the key plate at a predetermined rotation angle is provided at the rotation centre of the key plate. By temporarily fixing the key plate with the temporary fixing means while the roller shaft is fixed by the fixing part of the key plate, the key plate is less likely to start moving (initial movement) even when vibration or impact is applied to the roller shaft, and therefore the key plate is less likely to come off the roller shaft.

[0033] In addition, by temporarily fixing the key plate at a rotation angle that fits inside the bracket portion and does not interfere with work, the risk of the worker getting caught on it is reduced, making work safer.

[0034] [7] The roller stand of the present invention can also be configured so that a knob protruding in a predetermined direction is provided at the tip of the key plate.

[0035] In this case, a knob that protrudes in a specified direction is provided at the tip of the key plate, so that, for example, when rotating the key plate so that it covers the roller shaft and fastening it with the fastening part, or when releasing the fastening part, even if the contact part is somewhat tight due to individual differences, the operator can hook his / her finger and operate it firmly, allowing for more reliable work.

[0036] [8] In order to achieve the above object, the present invention provides an idler device comprising a specified roller stand and a roller journaled on the roller stand, wherein the roller stand comprises a bracket portion, a receiving groove provided laterally on the bracket portion for receiving the roller shaft of the roller inserted through an insertion opening, and a key plate rotatably attached to the bracket portion and having a stop portion for stopping the roller shaft inserted into the receiving groove at a specified rotation angle, wherein the roller is inserted into the receiving groove of the roller stand while engaging a locking groove provided at the end of the roller shaft, and is positioned at a specified location, and the roller shaft is stopped by the stop portion of the key plate rotated at a specified angle.

[0037] In the idler device of the present invention, the roller stand is equipped with a bracket portion and a receiving groove that is arranged horizontally on the bracket portion and receives the roller shaft of the roller inserted through the insertion opening, so that the roller shaft can be inserted horizontally along the receiving groove and the roller can be received by the bracket portion.

[0038] In addition, the roller shaft is rotatably attached to the bracket portion and has a key plate having a stopper portion for stopping the roller shaft inserted into the receiving groove at a predetermined rotation angle. Therefore, the roller shaft inserted into the receiving groove and positioned at a predetermined location can be stopped so as not to move by the stopper portion of the key plate rotated at the predetermined rotation angle, thereby rotatably supporting the roller.

[0039] Furthermore, by rotating the key plate in the opposite direction from the state in which the roller is rotatably supported, and releasing the state in which the roller shaft is stopped by the stopper, the roller shaft can be moved along the receiving groove, and the roller can be removed.

[0040] In this way, when installing and removing the rollers, the idler device of the present invention only requires moving the roller shaft sideways, i.e. horizontally, along the receiving groove, and does not require moving it up and down. Therefore, when replacing the rollers, it is possible to slide the belt sideways without lifting it with the rollers.

[0041] The roller is inserted into the receiving groove of the roller stand while the locking groove on the end of the roller shaft is engaged, and is positioned at a predetermined location, so the roller can be attached and detached by moving the roller shaft laterally along the receiving groove. The roller shaft is stopped by the locking part of the key plate rotated at a predetermined angle, so the roller cannot be moved in the direction of removal.

[0042] In other words, the idler device of the present invention allows the roller to be replaced by sliding it sideways without lifting the belt with the roller supported on the roller stand, and furthermore, the roller can be easily and quickly attached to and removed from the designated position of the bracket portion by simply rotating the key plate to stop the roller shaft at the stop portion and releasing that state. Effect of the Invention

[0043] The present invention provides a roller stand that allows the roller to be replaced by sliding the roller sideways without lifting the belt with the roller, and that allows the roller bracket part to be easily and quickly attached to and detached from a specified position, and an idler device equipped with the roller stand. [Brief description of the drawings]

[0044] [Figure 1]1 is a perspective view showing an embodiment of a roller stand according to the present invention; [Diagram 2] 2 is a front view of an idler device according to the present invention mounted on a belt conveyor, the rollers being supported by the roller stand shown in FIG. 1. FIG. [Diagram 3] 4 is a cross-sectional explanatory view showing the structure of a pivot support portion of a key plate that constitutes the roller base. FIG. [Figure 4] 11 is an explanatory diagram illustrating how the key plate is unlikely to come off when the roller base or the roller shaft vibrates. FIG. [Diagram 5] FIG. 13 is a perspective explanatory view showing a state in which a modified example of the key plate is attached to a roller stand. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0045] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a description will be given of an embodiment of a roller stand and an idler device according to the present invention (hereinafter, referred to as an "embodiment") with reference to the drawings.

[0046] (Roller stand 1) FIG. 1 is a perspective view showing one embodiment of a roller stand according to the present invention. The roller stand 1 shown here is attached to frames (not shown) on both sides of the lower return side of a belt conveyor, and is made entirely of metal having sufficient strength (for example, SUS material: stainless steel or SS material: general structural rolled steel, etc.).

[0047] The roller stand 1 has an attachment part 10 formed by bending a plate-like steel material into a U-shape. A bracket part 11 is provided at the inner end of the lower horizontal plate (reference number omitted) of the attachment part 10, and two oval attachment holes 100 are provided side by side in the upper horizontal plate (reference number omitted) that penetrate from the front to the back (see Figs. 2 and 5 described later).

[0048] The bracket part 11 is provided vertically and has a rectangular shape with the lower corners cut out into large and small right-angled triangles. A receiving groove 12 is provided slightly lower than the center in the height direction of the bracket part 11, running from one edge in the width direction (the left edge in Fig. 1) to the other.

[0049] The receiving groove 12 has a predetermined width in the vertical direction and is provided up to approximately the center of the bracket portion 11 in the width direction, and at its rear end an arc-shaped stop portion 123 is formed so that the roller shaft 20 of the roller 2 described later can abut against it along its outer periphery.

[0050] The insertion opening 120 of the receiving groove 12 is formed with cutouts 121 at both upper and lower corners cut out in a right-angled triangle shape, making it easy to insert the roller shaft 20. Furthermore, the edges 122 facing each other above and below in the lateral direction of the receiving groove 12 are formed linearly, making it easy to move the roller shaft 20 when it is fitted into a hook groove 21 (described later).

[0051] Additionally, near the stop portion 123 of the receiving groove 12 of the bracket portion 11, a key plate 13 is attached so as to be rotatable vertically along the surface of the bracket portion 11. The key plate 13 is a plate body formed into an approximately U-shape by a base member 131, an intermediate member 132, and a tip member 133, each of which has a predetermined length, and each of the inner corners and outer corners is appropriately rounded into an arc shape.

[0052] Of these, the surface of the inner corner between the intermediate member 132 and the tip member 133 of the key plate 13 is formed so as to roughly follow the curved surface of the outer periphery of the roller shaft 20, so that when it is placed over the roller shaft 20 from above, as described below, the surfaces can be brought close to each other naturally and roughly aligned (see Figure 2).

[0053] The inner edge of the tip member 133 is formed linearly, forming a stopper portion 135 that abuts against and stops the roller shaft 20. The tip member 133 is also formed to be about 30% longer than the base member 131, which makes the tip side heavier and makes it easier to rotate in the direction that covers the receiving groove 12 (counterclockwise in FIG. 1).

[0054] Furthermore, as described above, the key plate 13 is vertically rotatable about the rotation center portion. The structure of the rotation center portion of this embodiment will be described with reference to Fig. 3(a). The center of the key plate 13 is the shaft bolt 14 , which is composed of a head 140 , a central shaft portion 141 of a predetermined length, and a threaded portion 142 .

[0055] First, the threaded portion 142 and the central shaft portion 141 of the shaft bolt 14 are passed through the through hole 134 that penetrates the base member 131 of the key plate 13 , and the threaded portion 142 is screwed into the threaded hole 111 provided in the bracket portion 11 .

[0056] The screw portion 142 is fastened in a state in which the base member 131 is sandwiched between the head 140 and the bracket portion 11 and can rotate, and further an anti-loosening nut 143 is screwed onto the screw portion 142. This allows the key plate 13 to rotate around the central shaft portion 141 of the shaft bolt 14 at all times.

[0057] The position at which the shaft bolt 14 is fixed is set to the vertical center of the receiving groove 12, i.e., a position that is lower than the height of the center of the roller shaft 20 when the roller shaft 20 is inserted into the receiving groove 12 by a difference d (see Figure 4).

[0058] (Idler device A) Next, mainly with reference to FIG. 2, an idler device A employing the roller stand 1 of the present invention will be described. In this embodiment, the roller base 1 is used by arranging a pair of roller bases 1 side by side at the same position in the longitudinal direction of a frame (not shown) and supporting a roller 2 between them to form an idler device A on the return side, which will be described later. Note that the use of the roller base 1 is not limited to this, and it can also be adopted as an idler device on the carrier side of a belt conveyor.

[0059] The idler device A has a structure in which a roller 2 is mounted on the roller stand 1. The roller 2 has a roller shaft 20 and a roller body 22 rotatably supported on the roller shaft 20 via a bearing (not shown).

[0060] Further, near both ends of the roller shaft 20, there are provided two hook grooves 21 in the diametrical direction, which are fitted into the edge portions 122 that form the receiving groove 12. The hook grooves 21 are provided at two locations by cutting out the outer circumferential surface of the roller shaft 20 in the diametrical direction so that the bottom surfaces of the grooves are parallel to each other (see Figs. 2, 4, and Fig. 5 described later).

[0061] The position of the roller 2 is determined by fitting each of the hook grooves 21 of the roller shaft 20 into the edge portion 122 of the receiving groove 12 of the roller stand 1, and moving the roller shaft 20 along the edge portion 122 until it abuts against the stop portion 123 at the inner end of the receiving groove 12.

[0062] Then, the key plate 13 is rotated around the shaft bolt 14 in the direction of covering the roller shaft 20 in the receiving groove 12, and the stop portion 135 of the tip member 133 is abutted against the outer periphery of the roller shaft 20, thereby stopping the movement of the roller 2 in the direction of the insertion opening 120.

[0063] This allows roller body 22 of roller 2 to rotate at a fixed position around roller shaft 20. Note that stopper portion 135 and the outer periphery of roller shaft 20 may be in close contact with each other with no gap therebetween, or may have some gap therebetween within an allowable range.

[0064] (action) Here, the operation of the roller stand 1 of the present invention and the idler device A using the roller stand 1 will be described. First, we will explain the procedure and action when mounting the roller 2 on the roller stand 1 attached to the frame of the belt conveyor. In the roller stand 1 in the initial state before mounting the roller 2, the key plate 13 rotates downward by its own weight and hangs down, so the receiving groove 12 is open and does not interfere with the insertion of the roller shaft 20 of the roller 2 (not shown).

[0065] Then, as described above, the roller shaft 20 of the roller 2 is inserted into the receiving groove 12, the key plate 13 is rotated counterclockwise so as to cover the roller shaft 20 from above, and the idler device A is made operable by stopping it with the stopper portion 135 of the tip member 133 (see Figures 2 and 4).

[0066] In this state, when the belt conveyor is operated and the idler device A operates, causing vibrations and impacts to the rollers 2 and roller base 1, complex mechanical collisions and twists occur between the roller shaft 20, edge portion 122, and key plate 13, which can cause the key plate 13 to move in the opposite direction to the direction in which it covers and embraces the roller shaft 20, that is, in the direction in which it slips out of the roller shaft 20 (see key plates 13, 13a, 13b in Figure 4).

[0067] However, as described above, the axis bolt 14, which is the center of rotation of the key plate 13, is set at a position lower than the height of the center of the roller axis 20 by the difference d, so that the retaining portion 135, which is in approximate contact with the roller axis 20 like key plates 13a and 13b, can move not only in the direction away from the roller axis 20 upward, but also along the circular outer peripheral surface of the roller axis 20 while maintaining a close proximity to the outer peripheral surface (see Figure 4).

[0068] In other words, even if vibration or impact acts on the roller shaft 20 and causes the key plate 13 to rotate clockwise so as to come off the roller shaft 20, the stop portion 135 is located in close proximity to the outer peripheral surface of the roller shaft 20 and is therefore likely to come into contact with the outer peripheral surface, making it difficult to rotate.As a result, even if the roller shaft 20 tries to move toward the insertion opening 120, the key plate 13 is likely to rotate in the direction of embracing the roller shaft 20, making it difficult for the key plate 13 to come off.

[0069] Furthermore, because the tip member 133 of the key plate 13 is formed long as described above, the tip side of the key plate 13 is heavy, making it easier to rotate in the direction of embracing the roller shaft 20. In this way, the key plate 13 is continuously subjected to a load that rotates it in the direction of embracing the roller shaft 20, which also prevents the key plate 13 from rotating in the opposite direction and becoming detached due to vibration or impact applied to the roller shaft 20.

[0070] Furthermore, if the axle bolt 14, which is the rotation center of the key plate 13, is located at a position higher than the center of the roller axle 20 of the roller 2, when the roller axle 20 attempts to move toward the insertion opening 120 and the key plate 13 attempts to rotate in a direction to come off the roller axle 20, the retaining portion 135 will move away from the roller axle 20 immediately at the start of rotation, which would encourage the roller axle 20 to fall off, which is not desirable.

[0071] Furthermore, when the roller 2 becomes damaged and needs to be replaced due to aging of the belt conveyor, first, the key plate 13 is rotated clockwise to release the state in which the roller shaft 20 is stopped by the stopper 135. Then, the roller 2 is moved toward the insertion opening 120 of the receiving groove 12 and removed. Then, a new roller 2 is installed as described above.

[0072] When attaching and detaching the roller 2 to and from the bracket portion 11, the roller 2 only moves laterally along the receiving groove 12, and does not move in the vertical direction. Therefore, when replacing the roller, there is no need to lift the belt 3 of the belt conveyor with the roller 2, which reduces the burden on the worker during the work.

[0073] In this way, the roller stand 1 of the present invention and the idler device A using it can easily and quickly be attached to and detached from the receiving groove 12 of the bracket portion 11 of the roller 2.

[0074] The receiving groove 12 can also be inclined at a predetermined angle (to the extent that the belt does not need to be lifted significantly when attaching and detaching the roller 2) in the direction in which the insertion opening 120 becomes higher. In this case, the roller shaft 20 does not easily move toward the insertion opening 120, so that it is more effective in preventing the roller shaft 20 from falling out of the receiving groove 12.

[0075] Further, the structure of the pivot center portion of the key plate 13 is not limited to the above, and other structures may be used. Below, a modified example of the pivot center portion of the key plate 13 will be described with reference to Fig. 3(b).

[0076] The same shank bolt 14 as above is used. First, the threaded portion 142 and central shaft portion 141 of the shank bolt 14 are passed through the through hole 134 penetrating the base member 131 of the key plate 13, and the threaded portion 142 is inserted into the through hole 112 provided in the bracket portion 11. An inner nut 144 and an outer nut 145, which are double nuts, are screwed onto the threaded portion 142 protruding from the through hole 112 in a predetermined manner.

[0077] As a result, the screw portion 142 can be tightened with the inner nut 144 while the base member 131 is sandwiched between the head 140 and the bracket portion 11, and is less likely to come loose due to the action of the outer nut 145. Also, since the strength of the tightening of the key plate 13 by the inner nut 144 can be adjusted as necessary, it is possible to temporarily fix it at a predetermined rotation position by tightening it a little more.

[0078] Therefore, by temporarily fixing the key plate 13 with the roller shaft 20 fixed by the stopper portion 135 of the key plate 13, the key plate 13 is less likely to start moving even when the roller shaft 20 is subjected to vibration or impact, and accordingly, the key plate 13 is prevented from coming off the roller shaft 20.

[0079] Furthermore, by temporarily fixing the key plate 13 at a rotation angle that fits inside the bracket portion 11 and does not interfere with work, the risk of the worker getting caught on it is reduced, allowing for safer work.

[0080] Now, a modified example of the key plate 13 will be described with reference to FIG. At the tip of tip member 133 of key plate 13c, the member is bent outward at a right angle to form knob 136. As a result, for example, when rotating key plate 13 so as to cover roller shaft 20 and lock it with locking member 135, or when releasing locking member 135, even if the contact part is somewhat tight due to individual differences, the operator can hook his / her finger on knob 136 and operate it firmly, allowing for more reliable operation.

[0081] The terms and expressions used in this specification and the claims are merely explanatory and are not limiting, and are not intended to exclude terms and expressions equivalent to the features described in this specification and the claims, or parts thereof. It goes without saying that various modifications are possible within the scope of the technical idea of ​​this invention. [Explanation of symbols]

[0082] 1 Roller stand 10 Mounting part 100 Mounting hole 11 Bracket part 111 Screw hole 112 Through hole 12 Receiving groove 120 Insertion port 121 Notch 122 Margin 123 Stop part 13 Key Plate 131 Base member 132 Intermediate parts 133 Tip material 134 Through hole 135 Stopper 136 Knob 14 Axle bolt 140 Head 141 Central shaft part 142 Screw part 143 Locking nut 144 Inner nut 145 Outer nut A Idler device 2. Laura 20 Roller shaft 21 Latch groove 22 Roller body 3 Belt

Claims

1. A bracket portion; a receiving groove provided laterally on the bracket portion for receiving a roller shaft of the roller inserted through the insertion opening; a key plate rotatably attached to the bracket portion and having a stop portion for stopping the roller shaft inserted into the receiving groove at a predetermined rotation angle. Roller stand.

2. The bracket portion has an attachment portion for attachment to a predetermined frame of a belt conveyor. The roller stand according to claim 1.

3. The key plate is U-shaped with a predetermined portion of the inner edge serving as the stopper, and is adapted to rotate in a direction to cover the receiving groove from above. The roller stand according to claim 1.

4. The tip side member of the key plate is formed to be longer than the base side member by a predetermined length. The roller stand according to claim 3.

5. The pivot center of the key plate is provided at a predetermined position lower than the center of the receiving groove in the height direction. The roller stand according to claim 3.

6. A temporary fixing means for temporarily fixing the key plate at a predetermined rotation angle is provided at the rotation center of the key plate. The roller stand according to claim 1.

7. A knob protruding in a predetermined direction is provided at the tip of the key plate. The roller stand according to claim 3.

8. A predetermined roller stand; A roller journaled on the roller frame, The roller stand is a bracket portion; a receiving groove provided laterally on the bracket portion for receiving a roller shaft of the roller inserted through an insertion opening; and a key plate rotatably attached to the bracket portion and having a stop portion for stopping the roller shaft inserted into the receiving groove at a predetermined rotation angle, The roller is The roller shaft is inserted into the receiving groove of the roller stand while engaging with the engaging groove provided at the end of the roller shaft, and is positioned at a predetermined position, and the roller shaft is stopped by the stopper of the key plate which has rotated at a predetermined angle. Idler device.

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