Jig for rotating sprocket of chain conveyor and method for manually rotating chain conveyor

Abstract

To provide a jig for rotating sprockets of a chain conveyor and a method for manually rotating a chain conveyor which enable the chain conveyor to be manually rotated safely and efficiently when performing maintenance work on the chain conveyor such as a bucket conveyor.SOLUTION: A jig 1 for rotating sprockets of a chain conveyor comprises a disk-shaped base plate 11 having an outer diameter equal to or larger than the maximum outer diameter of a drive sprocket 2, one or more pairs of fixing bolts 12 fixed to the outer edge of the disk-shaped base plate 11 in such a manner that a fixing shaft portion 121 protrudes toward the rear side of the disk-shaped base plate 11 and placed diagonally relative to the axis of the drive sprocket 2, a plurality of fixing nuts 122 threaded onto the fixing shaft portions 121, and a rotation nut 13 which is fixed at a position having the same axis as the axis of the drive sprocket 2 on the surface of the disk-shaped base plate 11.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a sprocket rotating tool for a chain conveyor, and a method for manually operating a chain conveyor. More specifically, the present invention relates to a sprocket rotating tool for a chain conveyor used to manually rotate a drive sprocket of the chain conveyor, and a method for manually operating a chain conveyor using the tool. [Background technology]

[0002] Conventionally, bucket conveyors have been widely used as equipment for transporting powdery materials and other materials, using multiple buckets attached to a circularly driven endless chain (conveyor chain) to continuously transport materials (see Figure 6). A bucket conveyor is structured so that multiple steel buckets are connected to a conveyor chain, and power is transmitted to the chain via a drive sprocket to transport the buckets. This type of bucket conveyor deposits the material into a bucket at a specific position on the transport path, transports it to another position on the transport path, and then tilts the bucket to unload the material.

[0003] One example of a bucket conveyor's use is the transportation of matte material, which is a metal sulfide. In this case, the distance between where the material is loaded into the bucket and where it is unloaded is long, resulting in a very long conveyor chain. However, when performing various maintenance tasks, such as checking for the removal of chain pins attached to the conveyor chain to prevent the buckets from slipping out, or performing a test run after maintenance, the above maintenance tasks must be performed by manually rotating the drive sprocket, rather than by power operation using a drive motor, with fine adjustments to the rotation speed and frequency. Therefore, manually rotating the drive sprocket is physically demanding, time-consuming, and dangerous.

[0004] As described above, when manually turning a chain conveyor such as a bucket conveyor, which is essential for maintenance work, a conventional approach involves manually turning the conveyor by using a pipe wrench or similar tool on the shaft 24 (see FIG. 8) on the back of the drive sprocket 2. However, because the worker must apply significant force to turn the wrench, there is a risk of the wrench coming loose and the worker being hit by the recoil, resulting in an accident. Meanwhile, workers are reluctant to apply sufficient force due to fear of injury. Patent Document 1 discloses a turning jig for a steam turbine rotor, but this tool is fixedly installed in the facility, has a complex structure, and is not easily removable. This makes it difficult to use as a means for manually turning the conveyor during maintenance work on the bucket conveyor described above. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2021-134753 Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to enable manual operation of a chain conveyor such as a bucket conveyor safely and efficiently when performing maintenance work on the chain conveyor. [Means for solving the problem]

[0007] In view of the above problems, the inventors of the present invention have conducted extensive research into a removable jig for manually rotating the drive shaft of a chain conveyor. As a result, they have come up with the idea of ​​a jig that can easily and reliably fix a disk by utilizing the tooth profile of the sprocket of the drive shaft of a chain conveyor, and have completed the present invention. Specifically, the present invention provides the following.

[0008] (1) A sprocket rotation work jig for manually rotating a drive sprocket during maintenance work on a chain conveyor, comprising: a disk-shaped base plate having an outer diameter equal to or larger than the maximum outer diameter of the drive sprocket; one or more pairs of fixing bolts fixed to the outer edge of the disk-shaped base plate with fixing shafts protruding from the back side of the disk-shaped base plate and arranged diagonally relative to the axis of the drive sprocket; a plurality of fixing nuts threaded onto the fixing shafts; and a rotation nut fixed to the surface of the disk-shaped base plate at a position having the same axis as the axis of the drive sprocket.

[0009] The jig for rotating sprockets of a chain conveyor (1) has a simple structure, is easy to manufacture, and is easy to attach to and detach from the drive sprocket of the chain conveyor, and is also excellent in terms of the stability of the jig when fixed to the drive sprocket of the chain conveyor, and in the ease and safety of manual operation. Therefore, the jig for rotating sprockets of a chain conveyor (1) allows for safe and efficient manual operation of the chain conveyor when performing maintenance work on a chain conveyor such as a bucket conveyor.

[0010] (2) The jig for rotating sprockets of a chain conveyor according to (1), wherein the fixing bolts are two or more pairs.

[0011] According to the jig for rotating a sprocket of a chain conveyor (2), since there are two or more pairs of fixing bolts, the installation stability of the jig can be further improved when fixing it to the drive sprocket of the chain conveyor.

[0012] (3) The jig for rotating sprockets of a chain conveyor according to (2), wherein the number of the fixing bolts is four and the fixing bolts are arranged at equal angular intervals relative to the center of the disk-shaped base plate.

[0013] According to the jig for rotating a sprocket of a chain conveyor (3), the number of fixing bolts is set to four, and by arranging them at equal angular intervals, the work of attaching and detaching the jig to the drive sprocket of the chain conveyor is prevented from becoming complicated, and the stability of the jig when fixed can be sufficiently increased.

[0014] (4) A jig for rotating sprockets of a chain conveyor according to any one of (1) to (3), wherein a visible reference position indicator means for indicating the reference position of the rotation angle of the disk-shaped base plate is provided on the surface of the disk-shaped base plate.

[0015] (4) The chain conveyor sprocket rotation jig allows workers to easily identify the rotation angle and number of rotations of the drive sprocket when manually rotating it, making maintenance work more efficient.

[0016] (5) The jig for rotating sprockets of a chain conveyor according to (4), wherein the reference position indicating means is a button-shaped magnet magnetically attached to the surface of the disk-shaped base plate.

[0017] According to the chain conveyor sprocket rotation work jig of (5), by using a detachable button-type magnet as the reference position display means, it is possible to easily and flexibly configure the reference position display means adapted to the work content of each individual maintenance work.

[0018] (6) A jig for rotating sprockets of a chain conveyor described in any one of (1) to (3), in which a rotating tool prevention cap, which is a disk-shaped member having an outer diameter equal to or greater than the maximum outer diameter of the rotating nut, is removably attached to the head of the rotating nut.

[0019] According to the sprocket rotation work jig for a chain conveyor (6), by further providing a rotating tool prevention cap, which is a disk-shaped member, it is possible to prevent the rotating tool from coming off the sprocket rotation work jig of the present invention during manual operation of the chain conveyor, thereby making it possible to operate the chain conveyor by hand more safely and efficiently.

[0020] (7) A jig for rotating a sprocket of a chain conveyor according to any one of (1) to (3), wherein a rotation handle for rotating the disk-shaped base plate is engaged with the outer surface of the rotation nut.

[0021] According to the chain conveyor sprocket rotation jig (7), the rotation handle is engaged with the outer surface of the rotation nut, making it possible to operate the chain conveyor by hand more safely and efficiently.

[0022] (8) A method for manually operating a chain conveyor using a sprocket rotating jig for a chain conveyor described in any one of (1) to (3), comprising the steps of: fixing the sprocket rotating jig to the drive sprocket by fitting the fixing shaft portion of the sprocket rotating jig into the groove portion of the drive sprocket, and then screwing and tightening the fixing nut onto the fixing shaft portion, and then rotating the drive sprocket by manually turning a rotating tool while it is engaged with the outer surface of the rotating nut.

[0023] According to the method for manually operating a chain conveyor of (8), by enjoying the above-mentioned effects of the jig for rotating a sprocket of a chain conveyor described in any one of (1) to (3), it becomes possible to manually operate the chain conveyor safely and efficiently when performing maintenance work on a chain conveyor such as a bucket conveyor.

[0024] (9) A method for manually operating a chain conveyor according to (8), wherein the rotary tool is a wrench, and an operation-assisting pipe that extends the length of the wrench is attached to a grip of the wrench, and the rotary tool is rotated by human power.

[0025] According to the method for manually operating a chain conveyor (9), it can be performed using a rotary tool, which is a general-purpose item that is readily available, and yet it can be performed safely, efficiently, and with less manpower than the method for manually operating a chain conveyor (8). [Effects of the Invention]

[0026] According to the present invention, when performing maintenance work on a chain conveyor such as a bucket conveyor, manual operation of the chain conveyor can be performed safely and efficiently. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 1 is a perspective view of a sprocket rotating jig according to the present invention (in a state where it is fixed to a drive sprocket). [Figure 2] FIG. 2 is a front view of the sprocket rotating jig of FIG. 1. [Figure 3] 3 is a partially enlarged view of an engaging portion of the sprocket rotating jig of FIG. 2 with the drive sprocket. FIG. [Figure 4] FIG. 2 is a side view of the sprocket rotating jig of FIG. 1. [Figure 5] FIG. 2 is a front view of the sprocket rotating jig of FIG. 1 (with the rotating handle further engaged with the outer surface of the rotating nut). [Figure 6] 1 is a schematic diagram of the overall configuration of a bucket conveyor, which is an example of a chain conveyor that can be manually operated using the sprocket rotating jig of the present invention. [Figure 7] FIG. 1 is a diagram (front view) showing an example of the configuration of a drive means for a chain conveyor that can be manually operated using the sprocket rotating jig of the present invention. [Figure 8] FIG. 1 is a diagram (side view) showing an example of the configuration of a drive means for a chain conveyor that can be manually operated using the sprocket rotating jig of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to the embodiments described below.

[0029] <Chain conveyor sprocket rotation jig> The sprocket rotating jig for a chain conveyor of the present invention is a jig that is attached to a drive sprocket to manually rotate the drive sprocket during maintenance work on the chain conveyor (see Figures 1 and 5).The sprocket rotating jig for a chain conveyor of the present invention can be used with any chain conveyor that has a sprocket, without any particular limitations, but is particularly preferably used with bucket conveyors (see Figure 6).

[0030] A bucket conveyor is a transport device represented by a bucket conveyor 100 shown in FIG. 6. The bucket conveyor 100 is configured by a plurality of buckets 5, each capable of containing an object to be transported, arranged without gaps on an endless chain or the like that forms a transport path 6, which is an endless circular path. As shown in FIG. 6, the transport path 6 of the bucket conveyor 100 generally includes a lower horizontal transport section, a vertical transport section that moves up and down, and an upper horizontal transport section. Furthermore, when performing maintenance on the bucket conveyor 100, the drive chain 4 connecting the drive sprocket 2 and the drive motor 3 is removed, and the drive sprocket 2, which is disconnected from the drive motor 3, is manually rotated to move the bucket 5 to a desired position. For example, if the bucket conveyor 100 has an inspection window 7 located as shown in FIG. 6, the manual operation is performed in such a manner that inspection and repair work on parts requiring maintenance can be performed at the location of the inspection window 7.

[0031] (Overall composition) As shown in Figures 1 to 5, jig 1 for rotating sprockets of a chain conveyor, which is one preferred embodiment of the jig for rotating sprockets of a chain conveyor of the present invention, comprises at least a disk-shaped base plate 11, a plurality of fixing bolts 12, a plurality of fixing nuts 122, and a rotation nut 13. Jig 1 is used in a state where disk-shaped base plate 11 with rotation nut 13 at the center of the front surface side is attached to drive sprocket 2 by the plurality of fixing bolts 12 and fixing nuts 122.

[0032] (Disc-shaped substrate) The disk-shaped base plate 11 may be any disk-shaped member having sufficient rigidity to withstand manual rotation and fastening with bolts and nuts, but is preferably made of metal. Of these, a member made of SS400, a common structural steel, is particularly preferred because it is readily available and easy to process. The outer diameter of the disk-shaped base plate 11 may be appropriately optimized depending on the maximum outer diameter of the drive sprocket 2 to be attached. Specifically, the outer diameter of the disk-shaped base plate 11 is equal to or greater than the maximum outer diameter of the drive sprocket 2 to be attached. However, from the standpoint of ease of manufacture and handling, and to avoid problems such as interference with surrounding equipment, the outer diameter of the disk-shaped base plate 11 is preferably between 1.0 and 1.2 times the maximum outer diameter of the drive sprocket 2 to be attached.

[0033] (Fixing bolt) 1 and 4, multiple fixing bolts 12 are fixed to the outer edge of disc-shaped base plate 11 by joining means such as welding in such a manner that fixing shafts 121, which are the shafts of each bolt, protrude toward the back side of disc-shaped base plate 11 by a length equal to or greater than the thickness of drive sprocket 2. In this specification, the back side of disc-shaped base plate 11 refers to the surface that is expected to face drive sprocket 2 when attached to the drive sprocket 2 to be attached.

[0034] The total number of fixing bolts 12 must be at least one pair arranged diagonally with respect to the axis of the drive sprocket 2, in other words, at least two, that is, a pair of fixing bolts 12 arranged in a position point-symmetrical with any other fixing bolt 12 with respect to the center of the disk-shaped base plate 11. It is also preferable that the total number of fixing bolts 12 be four (two pairs) or more. Note that the center of the disk-shaped base plate 11 is usually located at the same position as the axis of the drive sprocket 2.

[0035] Furthermore, in the jig 1, all of the fixing bolts 12 are arranged diagonally to any of the other fixing bolts 12 with respect to the center of the disk-shaped base plate 11, in other words, in positions that are point-symmetric. FIG. 2 shows four bolts (two pairs), and all of these fixing bolts 12 are arranged in positions that are point-symmetric to any of the other fixing bolts 12 with respect to the center of the disk-shaped base plate 11. In this way, in the jig 1, the fixing bolts 12 are required to be arranged in positions that allow the fixing shaft portions 121 to fit into the groove portions 22 when attached to the drive sprocket 2. By thus arranging all of the fixing bolts 12 in positions that are point-symmetric to any of the other fixing bolts 12 with respect to the center of the disk-shaped base plate 11, when the jig is rotated by human power, the resultant force of the force vectors at each point of application becomes zero, and therefore no load, i.e., no force moment, is applied to the drive rotation shaft 23.

[0036] Furthermore, it is preferable that all of the fixing bolts 12 be arranged at equal angular intervals relative to the center of the disk-shaped base plate 11, if possible. Specifically, if there are four fixing bolts 12 in total, they should be arranged at 90° intervals, and if there are six fixing bolts, they should be arranged at 60° intervals. As shown in FIG. 2, in the jig 1, the four fixing bolts are arranged at equal angular intervals (90°) relative to the center of the disk-shaped base plate 11. By arranging all of the fixing bolts 12 at equal angular intervals (90°) relative to the center of the disk-shaped base plate 11 in this manner, the installation stability of the jig 1 when fixed to the drive sprocket 2 can be further improved. However, because the number of teeth on the drive sprocket 2 is determined by factors such as the reduction ratio, the number of teeth is not necessarily a multiple of four when the total number of fixing bolts 12 is four. Therefore, an essential requirement is that all fixing bolts 12 are positioned diagonally to any other fixing bolt 12 with respect to the center of the disk-shaped base plate 11, in other words, at positions that are point-symmetrical, and if possible, are positioned at equal angular intervals with respect to the center of the disk-shaped base plate 11.

[0037] The fixing bolt 12 has only to have an outer diameter of the fixing shaft 121 that can fit into the groove 22 of the drive sprocket 2 to be attached, and the length of the fixing shaft 121 that is longer than the total length of the thickness of the disk-shaped base plate 11, the thickness of the drive sprocket 2, and the thickness of the fixing nut 122. As long as these size conditions are met, various existing metal bolts can be used as the fixing bolt 12 without any particular restrictions. As an example, a steel M20 hex bolt that meets the above size conditions can be preferably used as the fixing bolt 12.

[0038] The fixing bolts 12 are preferably fixed to the disk-shaped substrate 11 by welding. As an example, a preferred method for fixing the fixing bolts 12 to the disk-shaped substrate 11 is to make U-shaped notches on the outer periphery of the disk-shaped substrate 11 and weld the fixing bolts 12 to the disk-shaped substrate 11 while engaging the notches. The method for passing the fixing bolts 12 through the outer periphery of the disk-shaped substrate 11 may be a circular notch or a U-shaped notch, but the method of making U-shaped notches is preferred because delicate alignment is required after actually installing the fixing bolts 121 to fit the fixing shafts 121 into the grooves 22 with as little clearance as possible.

[0039] The fixing nuts 122 can also be made of the same metal as the fixing bolts 12. Because the fixing nuts 122 need to be threaded onto the fixing bolts 12, they have the same diameter and groove shape as the fixing bolts 12. The fixing nuts 122 are preferably made of the same material as the fixing bolts 12. The fixing bolts 12 and fixing nuts 122 fixed to the disk-shaped base plate 11 sandwich and stably hold the drive sprocket 2 of the chain conveyor to be attached.

[0040] (Rotation nut) As shown in Figures 1 and 2, the rotation nut 13 is fixed to the center of the surface of the disk-shaped base plate 11 by welding or other joining means. In this specification, the "surface of the disk-shaped base plate" refers to the surface that is expected to be the opposite side of the drive sprocket 2 when the jig 1 is attached to the drive sprocket 2. By locating the rotation nut 13 at the center of the surface of the disk-shaped base plate 11 in this way, when the jig 1 is attached to the drive sprocket 2, a rotary tool such as a wrench or spanner can be engaged with the outer surface of the rotation nut 13 and rotated manually, allowing for safe and efficient manual operation of the chain conveyor. Normally, the center of the disk-shaped base plate 11 is aligned with the axis of the drive sprocket 2.

[0041] Various existing metal nuts can be used as the rotation nut 13 without any particular limitations. As an example, a common steel M40 hexagonal nut can be used. When using the jig 1, as shown in FIG. 5, a rotation tool 15 such as a wrench or spanner is inserted into the rotation nut 13, and the drive sprocket 2 can be rotated by manually rotating the disk-shaped base plate 11.

[0042] (Other configurations) In addition to the above basic configuration, the jig 1 preferably further includes a visible reference position indicator 14 on the surface of the disk-shaped substrate 11, as shown in FIGS. 1 and 2, which indicates the reference position of the rotation angle of the disk-shaped substrate 11. The reference position indicator 14 may be provided in one location, or in multiple locations as necessary. Alternatively, the reference position indicator 14 may be formed by magnetically attaching one or more readily available button-shaped magnets to any desired location on the surface of the metallic disk-shaped substrate 11. Any known magnet or magnetic product, such as a magnetic button with one side covered with a resin cover, may be used as the button-shaped magnet, as long as it can be magnetically attached to the surface of the disk-shaped substrate 11 and function as the visible reference position indicator 14 indicating the reference position.

[0043] Furthermore, it is more preferable that the jig 1 be provided with a rotary tool stopper cap (not shown), which is a disk-shaped member whose outer diameter is equal to or greater than the maximum outer diameter of the rotary nut 13, and that such a rotary tool stopper cap be attachable to the head of the rotary nut 13 by screwing or other detachable structure as needed. A male thread provided on one side of the rotary tool stopper cap can be threadedly engaged with a female thread formed on the inside of the rotary nut 13. When using the jig 1, after engaging a rotary tool 15 such as a wrench or spanner with the rotary nut 13, attaching this rotary tool stopper cap to the head of the rotary nut 13 prevents the rotary tool from coming off toward the opposite side of the drive sprocket due to the reaction force applied, thereby enabling safer and more efficient manual rotation.

[0044] Furthermore, instead of the rotation tool 15 consisting of a general-purpose tool such as a wrench or spanner, the jig 1 can also be configured to include a rotation handle that is fitted onto the outer surface of the rotation nut 13 and used to manually rotate the disk-shaped substrate 11. While the disk-shaped substrate 11 can be rotated sufficiently safely by engaging a general-purpose tool such as a wrench or spanner with the rotation nut 13, using a rotation handle customized for each jig allows for safer and more efficient manual rotation. For example, the rotation handle can be made more efficient by attaching a handle to the tip in a direction parallel to the axis of the sprocket.

[0045] <How to operate a chain conveyor by hand> Next, a method for manually operating a chain conveyor according to the present invention will be described. The method for manually operating a chain conveyor according to the present invention is a method for manually operating a chain conveyor performed using the above-described jig 1. In the following, an embodiment in which the chain conveyor to be implemented is a bucket conveyor 100 shown in Figure 6 will be described as an example of a preferred embodiment of the method for manually operating a chain conveyor according to the present invention.

[0046] When carrying out the method for manually operating a chain conveyor of the present invention, first, the bucket conveyor 100 (see Figure 6) to be used as the object of the method is stopped prior to carrying out the method, and then the drive chain 4 (see Figures 7 and 8) stretched between the drive motor 3 and the drive sprocket 2 is removed from the drive sprocket 2, completely disconnecting the drive sprocket 2 from the drive motor 3.

[0047] Then, with the bucket conveyor 100 in the above state, the fixing shafts 121 of the fixing bolts 12 of the jig 1 are fitted into the grooves 22 of the drive sprocket 2 (see FIG. 3), and the fixing nuts 122 are tightened to fix the jig 1 to the drive sprocket 2, i.e., the procedure for fixing the sprocket rotation jig is performed. Specifically, this procedure is performed by bringing the back surface of the disk-shaped base plate 11 of the jig 1 into close contact with the outer surface of the drive sprocket 2 from the outside of the drive sprocket 2, fitting the fixing bolts 12 into the grooves 22 of the drive sprocket 2, and then tightening the fixing nuts 122 diagonally to fix the jig 1 to the drive sprocket 2.

[0048] After carrying out the above steps, a rotary tool 15 such as a wrench or a spanner is engaged with the outer surface of the rotary nut 13 and then manually rotated to rotate the drive sprocket 2.

[0049] Here, when the rotary tool 15 is a wrench, it is preferable to perform the procedure of rotating the drive sprocket 2 with an operation assist pipe attached to the grip of the wrench, which extends the length of the grip. As mentioned above, for example, the bucket conveyor 100 for transporting mat material is a large-scale device, and the manual rotation work is a heavy muscular task that imposes a physical burden on the worker. In contrast, by manually operating the chain conveyor of the present invention using the above method using the operation assist pipe, the manual rotation work can be performed with less force due to the force moment, and the burden on the worker can be significantly reduced. [Example]

[0050] The present invention will be explained in more detail below by showing examples, but the present invention is not limited to the following examples in any way.

[0051] The sprocket rotation jig of the present invention, which has four fixing bolts fixed to a disk-shaped base plate at equal angular intervals, was applied to a bucket conveyor (transport capacity 60 t / hr) for transporting matte raw material, which is metal sulfide. The bucket conveyor was equipped with 320 buckets (200 mm wide x 280 mm high x 600 mm long) made of SS400 steel sheet material. The rotation jig, which has a 420 mm diameter disk-shaped base plate, was attached to a 400 mm diameter drive sprocket, and the "procedure for fixing the sprocket rotation jig" and the "procedure for rotating the drive sprocket" were sequentially carried out using the method described above. It was confirmed that the operator was able to rotate the drive sprocket with less force than conventional methods, allowing for safe and efficient manual operation of the chain conveyor. [Explanation of symbols]

[0052] 1 Sprocket rotation jig 11 Disk-shaped substrate 12 Fixing bolt 121 Fixing shaft part 122 Fixing nut 13 Rotation nut 14 Reference position display means (button-type magnet) 15 Rotary tools (wrench) 2 drive sprockets 21 Tooth 22 Groove 23 Drive shaft 24 shaft section 3. Drive motor 4 Drive chain 5 buckets 6 Transport path 7 Inspection window 100 Bucket Conveyor

Claims

1. A sprocket rotation work jig for manually rotating a drive sprocket during maintenance work on a chain conveyor, a disk-shaped base plate having an outer diameter equal to or larger than the maximum outer diameter of the drive sprocket; one or more pairs of fixing bolts fixed to the outer edge of the disk-shaped base plate with fixing shafts protruding toward the rear side of the disk-shaped base plate, and arranged diagonally with respect to the axis of the drive sprocket; a plurality of fixing nuts threadedly engaged with the fixing shaft portion; a rotation nut fixed to the surface of the disk-shaped base plate at a position having the same axis as the axis of the drive sprocket; Equipped with A jig for rotating sprockets on chain conveyors.

2. The fixing bolts are two or more pairs. The jig for rotating sprockets of a chain conveyor according to claim 1.

3. The number of the fixing bolts is four, and the fixing bolts are arranged at equal angular intervals with respect to the center of the disk-shaped substrate. The jig for rotating sprockets of a chain conveyor according to claim 2.

4. a visible reference position indicator for indicating a reference position of the rotation angle of the disk-shaped substrate is provided on the surface of the disk-shaped substrate; The sprocket rotating jig for a chain conveyor according to any one of claims 1 to 3.

5. the reference position indicating means is a button-shaped magnet magnetically attached to the surface of the disk-shaped substrate; The jig for rotating sprockets of a chain conveyor according to claim 4.

6. A rotation tool stopper cap, which is a disk-shaped member having an outer diameter equal to or larger than the maximum outer diameter of the rotation nut, is detachably attached to the head of the rotation nut. The sprocket rotating jig for a chain conveyor according to any one of claims 1 to 3.

7. a rotation handle for rotating the disk-shaped base plate is engaged with an outer surface of the rotation nut; The sprocket rotating jig for a chain conveyor according to any one of claims 1 to 3.

8. A method for manually operating a chain conveyor using the sprocket rotation jig for a chain conveyor according to any one of claims 1 to 3, comprising: The sprocket rotating jig is fixed to the drive sprocket by threading and tightening the fixing nut onto the fixing shaft portion of the sprocket rotating jig while fitting the fixing shaft portion of the sprocket rotating jig into the groove portion of the drive sprocket, and then a rotating tool engaged with an outer surface of the rotating nut is manually rotated to rotate the drive sprocket; How to operate a chain conveyor by hand.

9. the rotary tool is a wrench, and an operation assist pipe for extending the length of the grip portion is attached to the grip portion of the wrench, and the rotary tool is rotated by human power.

9. The method for manually operating a chain conveyor according to claim 8.

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