Jig and replacement auxiliary tool

Abstract

To easily replace traveling drive units or wheels.SOLUTION: A first jig (30) includes a base member (31) that is placed on the upper surface of a running rail and is movable along the running rail, and a movable member (33) that is movable relative to the base member (31) in the intersecting direction (D2) and has a first mounting portion (333) on which wheels are placed.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a jig and an exchange aid. [Background technology]

[0002] Conventionally, there are known article transport devices that travel on running rails to transport articles. For example, Patent Document 1 describes a stacker crane equipped with drive wheels that travel on ground rails. The stacker crane is equipped with a travel motor that rotates and drives the drive wheels. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-156635 Summary of the Invention [Problem to be solved by the invention]

[0004] However, maintenance work on the traveling carriage of an article transport device may require replacing the wheels of the traveling carriage and the traveling drive motor that drives those wheels.Replacing the wheels and traveling drive motor of the traveling carriage has traditionally been done entirely by hand by an operator without using any auxiliary tools or jigs.

[0005] However, if replacement work is required in a small work space, manual replacement may be a heavy burden for the worker. Also, because the wheels and drive motors are heavy, manual replacement of the wheels and drive motors may be difficult in a small work space.

[0006] An object of one aspect of the present invention is to facilitate replacement of a traveling drive unit or a wheel. [Means for solving the problem]

[0007] In order to solve the above problems, one aspect of the present invention provides a jig for replacing a wheel provided on an item transport device that transports items, or a traveling drive unit that includes the wheel, wherein the wheel is a wheel that rolls on the upper surface of a traveling rail, and the jig comprises: a base member that is placed on the upper surface of the traveling rail and is movable along the traveling rail; and a movable member that is movable relative to the base member in a direction intersecting the traveling rail and has a mounting portion on which the wheel is placed.

[0008] According to the above configuration, the first jig is movable along the traveling rail and can slide the movable member in a direction intersecting the traveling rail. That is, the traveling drive unit or wheel placed on the first jig can move in two directions. Therefore, the worker does not need to lift the wheel assembled as the traveling drive unit while removing the traveling drive unit, nor does the worker need to lift the wheel while removing the wheel. This allows the worker to easily replace the traveling drive unit or wheel. [Effects of the Invention]

[0009] According to one aspect of the present invention, an object is to easily replace a traveling drive unit or a wheel. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram showing an overview of a stacker crane. [Figure 2] FIG. 2 is a perspective view showing the configuration of a traveling drive unit. [Figure 3] FIG. 2 is a perspective view of the first jig as seen from above. [Figure 4] FIG. 2 is a perspective view of the first jig as seen from below. [Figure 5] FIG. 10 is an enlarged view of a portion where the movable member and the guide member are engaged with each other. [Figure 6] FIG. 2 is a side view of the first jig. [Figure 7] FIG. 4 is a schematic view showing the configuration of a second jig. DETAILED DESCRIPTION OF THE INVENTION

[0011] [Embodiment 1] Hereinafter, one embodiment of the present invention will be described in detail.

[0012] (Stacker crane overview) First, an overview of a stacker crane 1 will be described with reference to Figures 1 and 2. Figure 1 is a schematic diagram showing an overview of the stacker crane 1. Figure 2 is a perspective view showing the configuration of a traveling drive unit 20.

[0013] Stacker crane 1 is an example of an article transport device that transports articles. The operation of stacker crane 1 is controlled by a control device (not shown). Stacker crane 1 travels along traveling rails 2. Traveling rails 2 are installed on the floor and form the travel path of stacker crane 1. Stacker crane 1 travels in a direction along traveling rails 2. Hereinafter, the direction along traveling rails 2 will be referred to as "traveling direction D1." Note that stacker crane 1 may travel along multiple traveling rails 2. Stacker crane 1 includes a pair of masts 11, a carriage 12, and a traveling dolly 13.

[0014] The masts 11 are columnar members extending in the vertical direction D3. The pair of masts 11 are erected on the carriage frame 14 of the traveling carriage 13. Each mast 11 is equipped with an elevation guide rail (not shown). A carriage 12 attached between the pair of masts 11 is guided by the elevation guide rail to move in the vertical direction D3 relative to each mast 11. An article M is placed on the carriage 12 to be taken in and out between the carriage 12 and shelves on which various articles are stored.

[0015] The stacker crane 1 is equipped with one or more traveling drive units 20. As shown in FIG. 2, the traveling drive unit 20 includes wheels 21 that roll on the upper surface 2A of the traveling rail 2, and a traveling drive motor 22 that drives the wheels 21. The wheels 21 are drive wheels to which driving force from the traveling drive motor 22 is transmitted. Note that the stacker crane 1 may also be equipped with wheels that are driven wheels that roll on the upper surface 2A of the traveling rail 2. Furthermore, the driven wheels of the stacker crane 1 may run on a traveling rail 2 that is different from the traveling rail 2 on which the wheels 21 run.

[0016] The traveling drive unit 20 may include a reducer 23 that reduces the speed of the rotational motion transmitted from the traveling drive motor 22. The reducer 23 is disposed between the wheels 21 and the traveling drive motor 22. In this embodiment, the wheels 21, the traveling drive motor 22, and the reducer 23 are configured as a single unit. The reducer 23 has a large diameter portion 231 located on the wheel 21 side and a small diameter portion 232 located on the traveling drive motor 22 side.

[0017] The traveling drive unit 20 is removably attached to the carriage frame 14 of the traveling carriage 13. The traveling drive unit 20 is attached to the carriage frame 14 via a mounting plate 24. The traveling drive unit 20 is attached to the carriage frame 14 by inserting bolts (not shown) into each of a plurality of through holes formed in the mounting plate 24 and screwing the bolts into the carriage frame 14.

[0018] A cutout portion 15 is formed in the bogie frame 14. The cutout portion 15 has a fitting portion 151 and an insertion portion 152. The fitting portion 151 is a portion into which the large diameter portion 231 of the reducer 23 fits when the traveling drive unit 20 is attached to the bogie frame 14. The insertion portion 152 is a portion through which the traveling drive unit 20 moved in the traveling direction D1 can pass. More specifically, the insertion portion 152 is a portion through which the small diameter portion 232 of the reducer 23 can pass. The spacing of the insertion portion 152 in the up-down direction D3 is larger than the diameter of the small diameter portion 232 and smaller than the diameter of the large diameter portion 231.

[0019] (Replacement aids) Next, the replacement auxiliary tool 3 will be described with reference to Figs. 2 to 7. Fig. 3 is a perspective view of the first jig 30 as seen from above. Fig. 4 is a perspective view of the first jig 30 as seen from below. Fig. 5 is an enlarged view of the portion where the movable member 33 and the guide member 34 engage. Fig. 6 is a view of the first jig 30 as seen from the side. Fig. 7 is a schematic view showing the configuration of the second jig 50.

[0020] 2, an exchange auxiliary tool 3 is used when exchanging the traveling drive unit 20 provided in the stacker crane 1. The exchange auxiliary tool 3 includes a first jig 30 and a second jig 50.

[0021] As shown in FIG. 3, the first jig 30 can be attached to the traveling rail 2. The first jig 30 is a jig that supports the wheels 21 of the traveling drive unit 20. The first jig 30 includes a base member 31 and a movable member 33. The base member 31 is placed on the upper surface 2A of the traveling rail 2 and is movable along the traveling rail 2. The base member 31 is a member made of metal. The base member 31 is preferably a flat plate-shaped member. The base member 31 may be made up of multiple members.

[0022] A plurality of roller units 32 are attached to the base member 31. The roller units 32 have traveling rollers 321. The traveling rollers 321 roll on the upper surface 2A of the traveling rail 2. The traveling rollers 321 roll on the upper surface 2A of the traveling rail 2, thereby enabling the base member 31 to move along the traveling rail 2. The traveling rollers 321 are movable relative to the base member 31 in a direction intersecting the traveling rail 2. In the following description, the direction intersecting the traveling rail 2 is referred to as the "intersecting direction D2." In this embodiment, the intersecting direction D2 is a direction perpendicular to the traveling direction D1, as shown in FIG. 2 and other figures. Note that the intersecting direction D2 is not limited to a direction perpendicular to the traveling direction D1.

[0023] The roller unit 32 may have a holding member 322. The holding member 322 is a member that holds the traveling roller 321. The holding member 322 is attached to the base member 31 so as to be movable in the intersecting direction D2. The traveling roller 321 moves in the intersecting direction D2 as the holding member 322 moves. The traveling roller 321 moves within an opening 324 formed in the base member 31. The opening 324 is an opening whose longitudinal direction is the intersecting direction D2. The roller unit 32 may also have a positioning member 323. The positioning member 323 is a member that determines the position of the holding member 322 relative to the base member 31. The positioning member 323 is, for example, a screw.

[0024] Although the running rollers 321 of the roller unit 32 are configured to be movable in the cross direction D2 relative to the base member 31, the configuration is not limited to this. The running rollers 321 may also be configured to be detachable from the base member 31.

[0025] The movable member 33 is movable relative to the base member 31 in the intersecting direction D2. More specifically, the movable member 33 is movable on the upper surface 31A of the base member 31. The movable member 33 is a member made of resin. The movable member 33 may be a flat plate-shaped member or may be composed of multiple members. The movable member 33 has a first mounting portion 333 on which the wheel 21 is mounted. The movable member 33 also has an engaging protrusion 332 (see FIG. 5).

[0026] A plurality of regulating members 331 are attached to the movable member 33. In this embodiment, two regulating members 331 are located on both sides of the first mounting portion 333 in the running direction D1. Each regulating member 331 regulates the movement of the wheel 21 placed on the first mounting portion 333 in the running direction D1. Note that one regulating member 331 may be attached to the movable member 33.

[0027] The movable member 33 is guided by guide members 34 attached to the base member 31 and is movable in the transverse direction D2. The guide members 34 are attached to the upper surface 31A of the base member 31 so as to extend in the transverse direction D2. In this embodiment, the two guide members 34 are located on both sides of the movable member 33 in the traveling direction D1. The guide members 34 are made of resin.

[0028] As shown in FIG. 5, the guide member 34 has an engagement recess 341. The engagement recess 341 is formed in the guide member 34 along the direction in which the guide member 34 extends. The engagement recess 341 is an opening that faces the center of the base member 31 in the traveling direction D1. An engagement protrusion 332 formed on the movable member 33 slidably engages with the engagement recess 341. The engagement protrusion 332 engaged with the engagement recess 341 slides between the guide member 34 and the upper surface 31A of the base member 31. As a result, the movable member 33 is guided by the guide member 34, and moves in the intersecting direction D2 relative to the base member 31.

[0029] The position of the movable member 33 relative to the base member 31 is fixed by inserting the fixing member 37 into the opening 38. The fixing member 37 is, for example, a fixing pin. One or more openings 38 are formed in the base member 31. In this embodiment, the base member 31 is formed with an opening 38 for positioning the movable member 33 at a first position relative to the base member 31, and an opening 38 for positioning the movable member 33 at a second position relative to the base member 31.

[0030] In the first position, when the first jig 30 is attached to the traveling rail 2, the first mounting portion 333 is located above the upper surface 2A of the traveling rail 2. That is, in the first position, when the first jig 30 is attached to the traveling rail 2, the first mounting portion 333 is located below the wheels 21 of the traveling drive unit 20 attached to the bogie frame 14. In the second position, the movable member 33 is located further away from the traveling rail 2 than in the first position. In the second position of this embodiment, when the first jig 30 is attached to the traveling rail 2 and the wheels 21 are placed on the first mounting portion 333, the small diameter portion 232 of the reducer 23 is located at a position where it can pass through the insertion portion 152 of the cutout portion 15. FIGS. 3 and 4 show the movable member 33 in the first position, and as shown in FIG. 4, the fixed member 37 is inserted into the opening 38 for positioning the movable member 33 at the first position. The opening 38 shown in FIGS. 3 and 4, in which the fixed member 37 is not inserted, is an opening for positioning the movable member 33 at the second position.

[0031] As shown in FIG. 4 , first side rollers 36 and second side rollers 35 may be attached to the base member 31. The first side rollers 36 roll on a first side surface 2B of the traveling rail 2. The second side rollers 35 roll on a second side surface 2C of the traveling rail 2. The first side surface 2B faces the direction in which the traveling drive unit 20 is removed from the bogie frame 14, and the second side surface 2C faces the direction in which the traveling drive unit 20 is attached to the bogie frame 14. The direction in which the traveling drive unit 20 is removed from the bogie frame 14 is the direction in which the wheels 21 move away from the traveling rail 2 in the intersecting direction D2. The direction in which the traveling drive unit 20 is attached to the bogie frame 14 is the direction in which the wheels 21 move toward the traveling rail 2 in the intersecting direction D2. The first side rollers 36 and second side rollers 35 are attached to the underside 31B of the base member 31.

[0032] The first side roller 36 is attached to the base member 31 via a first mounting member 360. The first mounting member 360 has a first wall portion 361, a second wall portion 362, and a rib 363. As shown in FIG. 6, the first wall 361 is a wall portion extending in a direction along the first side surface 2B of the traveling rail 2. The first wall 361 is located in the center of the base member 31 in the intersecting direction D2. The first side roller 36 is attached to one end of the first wall portion 361 in the intersecting direction. The second wall portion 362 is a wall portion extending from the other end of the first wall portion 361 in the intersecting direction toward a direction intersecting the intersecting direction of the first wall portion 361. As shown in FIG. 4, in this embodiment, two second wall portions 362 are located on both ends of the first wall portion 361 in the traveling direction D1. The second wall portions 362 are fixed to the base member 31 by, for example, bolts or the like. The rib 363 is formed to connect the first wall portion 361 and the second wall portion 362 together.

[0033] The second side rollers 35 are attached to the base member 31 via second attachment members 350. As shown in FIG. 6, the second attachment member 350 is a wall portion extending along the second side surface 2C of the traveling rail 2. The second side rollers are attached to one end of the second attachment member 350 in the extension direction. The other end of the second attachment member 350 in the extension direction is attached to the base member 31.

[0034] A distance L1 in the up-down direction D3 between the first side rollers 36 and the base member 31 is longer than a distance L2 in the up-down direction D3 between the second side rollers 35 and the base member 31. More specifically, the distance L1 is the distance in the up-down direction D3 between the lower ends of the first side rollers 36 and the lower surface 31B of the base member 31, and the distance L2 is the distance in the up-down direction D3 between the lower ends of the second side rollers 35 and the lower surface 31B of the base member 31. In other words, the length of the first wall portion 361 in the up-down direction D3 is longer than the length of the second mounting member 350 in the up-down direction D3.

[0035] The second jig 50 is a jig that supports a portion of the traveling drive unit 20. A portion of the traveling drive unit 20 is placed on the second jig 50, which is movable relative to the floor. In this embodiment, the traveling drive motor 22 is placed on the second jig 50. Note that a portion of the reducer 23 of the traveling drive unit 20 may also be placed on the second jig 50.

[0036] As shown in FIG. 7 , the second jig 50 has a head 51, a body 52, and legs 53. The head 51 has a second mounting portion 511 on which the travel drive motor 22 is mounted. The body 52 connects the head 51 and the legs 53. The legs 53 have sliding members 54 made of resin that enable them to slide on the floor. The legs 53 have the sliding members 54, which enable the second jig 50 to move on the floor. The legs 53 have four sliding members 54. It is sufficient that the legs 53 have one or more sliding members 54. It is also possible that the legs 53 have casters or ball bearings that enable the second jig 50 to move on the floor.

[0037] Since the second jig 50 is configured to include the resin sliding member 54, the second jig 50 does not need to include casters or ball bearings that enable the second jig 50 to move on the floor. This allows the manufacturing cost of the second jig 50 to be reduced by the amount that the resin sliding member 54 is used.

[0038] (How to replace the travel drive unit) Next, we will explain the method for replacing the traveling drive unit 20 of the stacker crane 1. The traveling drive unit 20 is replaced, for example, in an area dedicated to maintenance. In the maintenance area, various devices are provided to enable the replacement or removal of various components of the stacker crane 1.

[0039] First, the worker removes the traveling drive unit 20 from the traveling carriage 13. The worker places a jack under the carriage frame 14 of the traveling carriage 13. After that, the worker uses the jack to jack up the stacker crane 1. At this time, the worker jacks up the stacker crane 1 to a height where a gap is formed between the wheels 21 of the traveling drive unit 20 and the upper surface 2A of the traveling rail 2 so that the first jig 30 can be inserted.

[0040] Next, the worker uses the replacement auxiliary tool 3 to remove the traveling drive unit 20 from the bogie frame 14. Specifically, the worker positions the first jig 30 and the second jig 50 below the traveling drive unit 20. The worker attaches the first jig 30 to the traveling rail 2. The worker positions the traveling rollers 321 of the roller unit 32 so that they do not come into contact with the wheels 21. That is, the worker positions the traveling rollers 321 of the roller unit 32 so that the distance between the traveling rollers 321 of the opposing roller unit 32 in the cross direction D2 is the largest. The worker also moves the movable member 33 to the second position so that the wheels 21 do not come into contact with the regulating members 331 of the movable member 33. Thereafter, the worker moves the first jig 30 in the traveling direction D1 and inserts the first jig 30 into the gap between the wheels 21 and the upper surface 2A of the traveling rail 2. The worker also moves the second jig 50 to below the travel drive motor 22.

[0041] Thereafter, the worker reduces the amount by which the stacker crane 1 is jacked up, places the wheels 21 on the first placement section 333, and places the travel drive motor 22 on the second placement section 511. After fixing the travel drive motor 22 to the head section 51, the worker removes the bolts from the mounting plate 24, making it possible to remove the travel drive unit 20 from the carriage frame 14.

[0042] Next, the worker moves the traveling drive unit 20 in the intersecting direction D2 and pulls out the wheels 21 in a direction away from the traveling rail 2. At this time, the movable member 33 moves in a direction away from the traveling rail 2 as the wheels 21 move in the intersecting direction D2. The worker moves the wheels 21 in the intersecting direction D2 until the movable member 33 is located in the second position. With the movable member 33 still in the second position, the worker moves the traveling drive unit 20 in the traveling direction D1 and pulls out the traveling drive unit 20 from the bogie frame 14. The first jig 30 moves from the bogie frame 14 toward the traveling drive unit 20 as the wheels 21 move in the traveling direction D1. At this time, the second jig 50 moves on the floor as the traveling drive unit 20 moves in the intersecting direction D2 and the traveling direction D1.

[0043] Next, the worker releases the fixed relationship between the traveling drive motor 22 and the head 51. After that, the worker uses a chain block to lift the traveling drive unit 20 that was removed from the carriage frame 14. The traveling drive unit 20 that has been lifted by the chain block is placed on a transport platform, and the traveling drive unit 20 is replaced. Note that when attaching a new traveling drive unit 20 to the carriage frame 14, the above-described procedure is reversed.

[0044] Conventionally, the replacement of the traveling drive unit 20 has been performed manually by a worker. Therefore, the worker has to lift the traveling drive unit 20 by hand and remove it from the bogie frame 14. However, the first jig 30 used when replacing the traveling drive unit 20 is movable along the traveling rail 2 and allows the movable member 33 to slide in the intersecting direction D2. In other words, the traveling drive unit 20 placed on the first jig 30 is movable in two directions. Therefore, the worker does not need to lift the wheels 21 assembled as the traveling drive unit 20 while removing the traveling drive unit 20. This allows the worker to easily replace the traveling drive unit 20.

[0045] Furthermore, with the replacement aid 3, the traveling drive unit 20 is supported using the first jig 30 and the second jig 50, so that the worker does not need to lift the traveling drive unit 20 while removing it. This allows the worker to easily replace the traveling drive unit 20.

[0046] Furthermore, if the traveling rollers 321 are configured to be detachable from the base member 31 or movable in the intersecting direction D2 relative to the base member 31, when the stacker crane 1 is jacked up and the first jig 30 is placed under the wheels 21 of the traveling drive unit 20, the traveling rollers 321 can be moved to a position where they do not come into contact with the wheels 21. This allows the amount by which the stacker crane 1 is jacked up to be reduced.

[0047] Furthermore, according to a configuration in which the first jig 30 includes the first side rollers 36 and the second side rollers 35, when the first jig 30 is attached to the traveling rail 2, the first side rollers 36 are positioned lower than the second side rollers 35 in the up-down direction D3. Therefore, even if the movable member 33 is moved to move the traveling drive unit 20 in the intersecting direction D2 when removing the traveling drive unit 20, the base member 31 is supported on the traveling rail 2 by the first side rollers 36. This makes it possible to prevent the first jig 30 from tilting with respect to the upper surface 2A of the traveling rail 2.

[0048] Furthermore, with the configuration in which the guide member 34 has the engaging recess 341 and the movable member 33 has the engaging protrusion 332, there is no need to attach a roller to the movable member 33 for moving it in the intersecting direction D2. This makes it possible to lower the height of the first jig 30. This allows the amount of jacking up of the stacker crane 1 to be reduced.

[0049] [Modification] In the above-described embodiment, the first jig 30 is used when replacing the traveling drive unit 20 equipped in the stacker crane 1, but this is not limited to this. The first jig 30 may also be used when replacing only the wheels equipped in the stacker crane 1.

[0050] For example, when replacing only the wheels 21 of the stacker crane 1, only the first jig 30 may be used. In this case, the travel drive motor 22 and the reducer 23 of the travel drive unit 20 are attached to the carriage frame 14, and only the wheels 21 are removed from the travel drive unit 20. The worker inserts the first jig 30 between the wheels 21 of the jacked-up stacker crane 1 and the upper surface 2A of the travel rail 2 from the travel direction D1. The wheel 21 placed on the first placement portion 333 is moved in the intersecting direction D2, and the movable member 33 is positioned at the second position. In the intersecting direction D2, the wheel 21 is moved away from the travel rail 2, and the wheel 21 is removed from the travel drive unit 20. The first jig 30 is then moved in the travel direction D1 together with the wheel 21, and the wheel 21 is replaced.

[0051] The first jig 30 is not limited to being used when replacing the wheels 21 that are the drive wheels of the stacker crane 1. The first jig 30 is used when replacing the wheels that are provided on the stacker crane 1 and that roll on the upper surface 2A of the traveling rail 2.

[0052] According to this modification, the first jig 30 is movable along the traveling rail 2, and the movable member 33 is slidable in the intersecting direction D2. That is, the wheels of the stacker crane 1 placed on the first jig 30 are movable in two directions. Therefore, the worker does not need to lift the wheels while removing them. This allows the worker to easily replace the wheels.

[0053] 〔summary〕 The jig according to aspect 1 of the present invention is a jig for replacing a wheel provided on an item transport device that transports items, or a traveling drive unit including the wheel, wherein the wheel is a wheel that rolls on the upper surface of a traveling rail, and comprises: a base member that is placed on the upper surface of the traveling rail and is movable along the traveling rail; and a movable member that is movable relative to the base member in a direction intersecting the traveling rail and has a mounting portion on which the wheel is placed.

[0054] According to the jig of aspect 1, the jig is movable along the traveling rail and can slide the movable member in a direction intersecting the traveling rail. That is, the traveling drive unit or wheel placed on the first jig can move in two directions. Therefore, the worker does not need to lift the wheel assembled as the traveling drive unit while removing the traveling drive unit, nor does the worker need to lift the wheel while removing the wheel. This allows the worker to easily replace the traveling drive unit or wheel.

[0055] A jig according to aspect 2 of the present invention is the same as aspect 1 above, in that the base member is provided with a running roller that rolls on the upper surface of the running rail, and the running roller may be detachable from the base member or movable relative to the base member in a direction intersecting the running rail.

[0056] According to the jig of the second aspect, it is possible to attach / detach the traveling rollers to / from the base member, or to move them in a direction intersecting the traveling rails. Therefore, when the article transport apparatus is jacked up and the first jig is placed under the wheels of the travel drive unit, the traveling rollers can be moved to a position where they do not come into contact with the wheels. This reduces the amount by which the article transport apparatus needs to be jacked up.

[0057] A jig according to aspect 3 of the present invention is the same as in aspect 1 or 2 above, wherein a first side roller is attached to the base member via a first mounting member and a second side roller is attached via a second mounting member, the first side roller rolls on a first side of both sides of the running rail that faces the direction in which the wheels or the running drive unit are removed, and the second side roller rolls on a second side of both sides of the running rail that faces the direction in which the wheels or the running drive unit are attached, and the vertical distance between the first side roller and the base member may be longer than the vertical distance between the second side roller and the base member.

[0058] According to the jig of Aspect 3, the first side rollers are positioned lower than the second side rollers in the vertical direction. Therefore, when removing the traveling drive unit or the wheels, even if the movable member is moved to move the traveling drive unit or the wheels in a direction intersecting the traveling rail, the first side rollers support the base member on the traveling rail. This prevents the first jig from tilting relative to the upper surface of the traveling rail.

[0059] The replacement aid of aspect 4 of the present invention is an replacement aid for replacing a traveling drive unit equipped in an item transport device that transports items, and comprises a first jig that is a jig described in any one of aspects 1 to 3, and a second jig on which a part of the traveling drive unit is placed and which is movable relative to the floor.

[0060] According to the replacement aid of aspect 4, by using the first and second jigs to support the traveling drive unit, the worker does not need to lift the traveling drive unit while removing it, which allows the worker to easily replace the traveling drive unit.

[0061] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Explanation of symbols]

[0062] 1 stacker crane 2 Running rails 3 Replacement aids 13 Traveling cart 20 Traveling drive unit 21 wheels 22 Travel drive motor 30 First jig 31 Base member 33 Movable parts 34 Guide member 35 Second side roller 36 First side roller 50 Second jig 54 Sliding member 321 Traveling roller 332 Engagement protrusion 333 First Placement Section 341 Engagement recess 350 Second mounting member 360 First mounting member

Claims

1. A jig for replacing a wheel provided in an article transport device that transports an article, or a traveling drive unit including the wheel, the wheels are wheels that roll on the upper surface of a traveling rail, a base member that is placed on an upper surface of the traveling rail and is movable along the traveling rail; a movable member that is movable relative to the base member in a direction intersecting the traveling rail and has a mounting portion on which the wheel is mounted.

2. The base member is provided with a traveling roller that rolls on an upper surface of the traveling rail, The traveling roller is detachable from the base member, or is movable relative to the base member in a direction intersecting the traveling rail. The jig according to claim 1 .

3. a first side roller is attached to the base member via a first attachment member, and a second side roller is attached to the base member via a second attachment member; The first side roller rolls on a first side surface of both side surfaces of the traveling rail that faces a direction in which the wheel or the traveling drive unit is removed, The second side rollers roll on a second side surface of the traveling rail that faces a direction in which the wheels or the traveling drive units are attached, a distance between the first side roller and the base member in the up-down direction is longer than a distance between the second side roller and the base member in the up-down direction; The jig according to claim 1 .

4. A replacement aid for replacing a traveling drive unit included in an article transport device that transports articles, The jig according to any one of claims 1 to 3 as a first jig; a second jig on which a portion of the traveling drive unit is placed and which is movable relative to a floor.

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