JP6287700B2 - Article conveying device - Google Patents

Description

  The present invention includes a traveling vehicle that includes traveling wheels and travels along a traveling route, and a lifting mast that guides the lifting platform that supports an article to be transported. The traveling wheel serves as the traveling wheel in the traveling direction of the traveling vehicle. Article transportation provided with a first wheel whose existence range overlaps with the elevating mast, a second wheel located in front of the first wheel, and a third wheel located behind the first wheel Relates to the device.

As a conventional example of such an article conveying device, Japanese Patent Application Laid-Open No. 06-156635 (Patent Document 1) includes a second wheel provided at the front portion of the traveling carriage and a third wheel provided at the rear portion. The thing provided with the 1st wheel with which a raising / lowering mast and an existing range overlap in the running direction of a running cart is disclosed.
The article conveying apparatus of Patent Document 1 applies the load of the article conveying apparatus to the second wheel and the third wheel, and supports the first and second masts with overlapping ranges in the traveling direction of the traveling carriage. Therefore, the load of the article conveying device supported by the traveling wheel can be distributed between the first wheel, the second wheel, and the third wheel, and the concentration of the load on any of the plurality of traveling wheels is suppressed. be able to.

  By the way, since a large load is applied to the part of the traveling carriage provided with the lifting mast, when the first wheel is fixed to the traveling carriage and attached, most of the lifting mast load is the first wheel. Therefore, there is a problem that the first wheel is enlarged because the first wheel needs to be strong enough to withstand the load.

  Therefore, the article conveying device of Patent Document 1 is configured to support the first wheel on the wheel frame, and to attach the wheel frame to the traveling carriage in a state of being movable up and down with respect to the traveling carriage. For example, the first wheel is configured to bear a load corresponding to the pressing force by the pressing portion by pressing downward with a spring or the like. For this reason, each of the first wheel, the second wheel, and the third wheel can be configured to share an appropriate load that should be shared by itself. However, it is possible to avoid such a situation that the size is increased to ensure the strength.

Japanese Patent Laid-Open No. 06-156635

  However, since the article conveyance device of Patent Document 1 is configured to provide a pressing portion at a location that does not overlap the first wheel in the traveling direction of the wheel frame, the dimensions of the wheel frame in the longitudinal direction of traveling are increased. In order to stably provide the elevating mast on the traveling carriage, the fixed portion for fixing the elevating mast to the traveling carriage is provided so as to avoid the existence range of the wheel frame that moves up and down. Thus, for example, when the lifting mast is a single lifting mast having a pair of support columns in the front and rear in the traveling direction, the dimension in the traveling front and rear direction of the single lifting mast is large. In addition, when a pair of elevating masts are provided in the longitudinal direction of travel of the traveling carriage, the distance between the pair of elevating masts in the longitudinal direction of travel is increased. For this reason, there has been a problem that it is difficult to reduce the size of the traveling carriage in the front-rear direction.

  Therefore, it has been desired to realize an article conveying apparatus that can suppress the increase in size of the traveling wheel and can reduce the size of the traveling carriage in the front-rear direction.

An article conveying apparatus according to the present invention for solving the above-described problems includes a traveling carriage that includes traveling wheels and travels along a traveling path, and an elevating mast that guides the lifting platform that supports articles to be conveyed. As the traveling wheel, a first wheel whose existence range in the traveling direction of the traveling carriage overlaps with the lifting mast, a second wheel positioned forward of the first wheel, and a rear side of the first wheel. A third wheel for carrying the article,
The first wheel is supported by a wheel frame, the wheel frame is attached to the traveling carriage so as to be movable up and down with respect to the traveling carriage, and a pressing portion that presses the wheel frame downward is provided on the traveling carriage. The pressing part is characterized in that it overlaps with the area where the first wheel is present in plan view.

  That is, in addition to the second wheel disposed at the front end portion of the traveling carriage in the traveling direction and the third wheel disposed at the rear end portion of the traveling carriage as the traveling wheels that support the load of the traveling carriage, the traveling direction Since the first wheel as the traveling wheel is provided at a location overlapping with the range in which the lifting mast is present, the load of the article transfer device is shared by the second wheel and the third wheel in addition to the first wheel. It can support, and the enlargement of each of the 2nd wheel, the 3rd wheel, and the 1st wheel can be controlled.

Since the first wheel is provided so that the lifting mast and the existing range overlap in the traveling direction of the traveling carriage, the first wheel mainly supports the lifting mast load in the traveling carriage, but supports the first wheel. Since the wheel frame is attached to the traveling carriage so as to be movable up and down with respect to the traveling carriage, and the wheel frame is pressed downward by the pressing portion, the first wheel corresponds to the pressing force of the pressing portion. What is necessary is to support the load. For this reason, the load which a 1st wheel should bear among the loads of a raising / lowering mast is reduced, and the enlargement of a 1st wheel can be suppressed. In addition, since the pressing portion is disposed so as to overlap with the existence region of the first wheel in a plan view, the pressing portion is located at a location that does not overlap with the first wheel in the traveling direction of the wheel frame as in Patent Document 1. Compared with what is provided, the dimensions of the wheel frame can be made smaller in the traveling direction. For this reason, for example, when the fixed parts of the elevating mast are provided before and after the wheel frame in the traveling direction, the width of the elevating mast can be reduced in the traveling direction, for example, the width of the elevating mast can be reduced. Thus, it is easy to reduce the size of the traveling carriage in the front-rear direction.
In this way, it is possible to provide an article transport apparatus that can suppress the increase in size of the traveling wheel and can reduce the size of the traveling carriage in the front-rear direction.

  In the article transporting apparatus according to the present invention, it is preferable that the second wheel and the third wheel are driven wheels, and the first wheel is a driving wheel for driving the traveling carriage.

  In general, when a traveling vehicle is driven, the load applied to the front wheel in the traveling direction and the load applied to the rear wheel change due to the movement of the center of gravity accompanying acceleration or deceleration (hereinafter, the load applied to the wheel is referred to as the wheel load). Called). Specifically, the wheel weight of the rear wheel in the traveling direction increases during acceleration, and the wheel weight of the front wheel increases during deceleration. Therefore, when the front wheels or the rear wheels in the traveling direction are used as driving wheels, the traction by the driving wheels during acceleration and deceleration varies. On the other hand, since the first wheel is located between the second wheel and the third wheel, the wheel load change accompanying the change in the center of gravity at the time of acceleration and deceleration of the traveling carriage compared to the second wheel and the third wheel. Is small. Therefore, the fluctuation | variation of the traction by a driving wheel can be suppressed by making a 1st wheel into a driving wheel. Thus, the fluctuation | variation of the traction by the driving wheel at the time of acceleration and deceleration can be suppressed by making a 1st wheel into a driving wheel and making a 2nd wheel and a 3rd wheel into a driven wheel.

  In the article conveying device according to the present invention, a pair of the driving wheels are provided side by side in the traveling direction, the wheel frame is provided separately for each of the pair of driving wheels, and the pressing portion is a pair of the above-mentioned Separately provided to the wheel frame, and the press locations where the pair of pressing portions press the wheel frame are arranged to be arranged back and forth with respect to the center of the elevating mast in the traveling direction. preferable.

That is, since a pair of drive wheels as the first wheels are arranged in the running direction, the load applied to the first wheels can be distributed to each of the pair of drive wheels, and the dimensions of each wheel are reduced. be able to. For this reason, the arrangement space of the drive wheels in the height direction can be reduced, and space saving in the height direction can be achieved.
In addition, since the pressing points where the pair of pressing parts press the wheel frame are arranged back and forth with respect to the center of the elevating mast in the traveling direction, the front of the traveling direction is moved by the movement of the center of gravity accompanying acceleration or deceleration. Even if the wheel weight of the wheel on the side and the wheel weight of the wheel on the rear side change, it is possible to appropriately maintain the fluctuation of the pressing force that presses the wheel frame by the pressing portion, and the driving wheel at the time of acceleration and deceleration The fluctuation of traction due to can be suppressed.

  In the article transporting apparatus according to the present invention, the traveling carriage is disposed so as to overlap the range of the lifting mast in the traveling direction, and the second wheel side with respect to the central frame portion A second frame portion that extends to the third wheel side with respect to the central frame portion, the central frame portion extending along the traveling direction and A pair of travel direction parts spaced apart in a lateral direction perpendicular to the travel direction, and a connection part for connecting the pair of travel direction parts above the first wheel and supporting the elevating mast, The second frame portion includes a pair of travel direction frames, and each of the pair of travel direction frames extends along the travel direction and is spaced apart from each other in the lateral width direction. The part comprises a pair of travel direction frames The pair of running direction frames extend along the running direction and are spaced apart from each other in the lateral width direction, and the wheel frame swings on an attachment member connected to the central frame portion. The pressing unit includes a switching mechanism that switches between an operation state in which the wheel frame is urged downward and a non-operation state in which a downward urging force is reduced from the operation state. Further, the wheel frame and the attachment member are slid along the traveling direction from a position overlapping with the pair of traveling direction portions from a position overlapping with the pair of traveling direction frames as viewed in the lateral width direction. It is preferable that a wheel frame slide path to be moved is formed.

That is, when the first wheel is removed from the traveling carriage, for example, when the first wheel is maintained, the pressing portion is switched to the non-operating state and the connection between the central frame portion and the mounting member is released, and the wheel frame and the mounting member are removed. The first wheel can be removed from the traveling carriage by moving from a position overlapping with the pair of traveling direction portions to a position overlapping with the pair of traveling direction frames when viewed in the lateral width direction along the wheel frame slide path. . On the other hand, when the first wheel is attached to the traveling carriage when maintenance is completed, the wheel frame and the mounting member overlap the pair of traveling direction frames as viewed along the lateral width direction along the wheel frame slide path. By moving the first wheel from the position to a position overlapping with the pair of traveling direction parts, the first wheel is positioned at a predetermined attachment position where the existence range overlaps with the lifting mast in the traveling direction of the traveling carriage, and the central frame part and the attachment member Then, the first wheel can be attached to the traveling carriage by switching the pressing portion to the operating state.
Therefore, it is possible to realize an article transporting apparatus having good workability when performing maintenance work on the first wheel located below the lifting mast.

  In the article transporting apparatus according to the present invention, the traveling carriage is disposed so as to overlap the range of the lifting mast in the traveling direction, and the second wheel side with respect to the central frame portion A second frame portion that extends toward the third wheel with respect to the central frame portion, the second frame portion, the central frame portion, and the third frame portion. Are configured as separate bodies, the second frame portion and the central frame portion are connected and fixed to each other, and the traveling carriage is connected to and fixed to each other. Preferably, the wheel frame is attached to the central frame portion.

The traveling carriage is located below the lifting mast and supports the load of the lifting mast. For this reason, when the entire traveling carriage is integrally formed with a single member, it is necessary to provide the strength necessary to support the load of the lifting mast over the entire traveling carriage, and the traveling carriage is increased in size or traveled. There is a risk that the weight of the carriage will increase.
As in this feature configuration, a central frame part, a second frame part extending toward the second wheel with respect to the central frame part, and a third extending toward the third wheel with respect to the central frame part If the frame part is separated, the central frame part is configured to be strong enough to support the load of the lifting mast, and the second frame part and the third frame part are: It can be set as the structure which gives each required minimum intensity | strength, the enlargement of a traveling trolley | bogie can be suppressed and the weight of a traveling trolley | bogie can be made small.

  In the article conveying apparatus according to the present invention, it is preferable that the central frame portion is formed as one member.

  Since the central frame portion is located below the lifting mast, a large load is applied by the lifting mast. For this reason, when the central frame portion is formed by fastening and fixing a plurality of portions (traveling direction portion and connecting portion, etc.) with bolts and nuts, or fastening a plurality of members with rivets, for example, fastening There is a possibility that a situation occurs in which stress concentrates on a connection part such as a hole for use and the connection part is deformed. Therefore, by forming the central frame portion with a single member, deformation at the connecting portion as described above can be suppressed. In addition, the above-mentioned one member means that a plurality of parts are configured as inseparable parts in advance, for example, by casting or cutting, or a plurality of members formed as separate bodies are integrated so as not to be separated by welding or the like. It contains what was made into

Perspective view of main part of article transport device and article storage facility provided with the same Side view of article transport device Partial perspective view of traveling cart Top view of traveling cart The figure which shows the attachment state of a driving wheel in a traveling trolley, and a press state Exploded perspective view of traveling cart, drive wheel, and traveling motor The figure which shows the removal operation of the drive wheel to the traveling cart

Hereinafter, an embodiment of an article storage facility provided with an article conveying device of the present invention will be described based on the drawings.
As shown in FIG. 1, the article storage facility A includes an article storage shelf 1 provided with a plurality of storage units S that store articles B in the vertical direction and the horizontal direction. The article storage shelves 1 are installed at an interval so that the article loading / unloading directions face each other (FIG. 1 shows only one of the pair of opposing article storage shelves 1). A traveling rail R <b> 1 on which a traveling carriage 31 of a stacker crane C as an article conveying device travels is laid along the front of the article storage shelf 1 on the front of the article storage shelf 1. Further, an upper rail R <b> 2 that guides the upper frame 33 of the stacker crane C is provided above the traveling rail R <b> 1 and higher than the upper end of the article storage shelf 1. In the present embodiment, the storage section S is configured to store two articles side by side in the article insertion / removal direction, but may be a storage section S that stores one article in the article insertion / removal direction.

  As shown in FIGS. 1 and 2, the stacker crane C includes a traveling vehicle 31 that includes traveling wheels W and travels on the traveling rail R1, and is fixed to the traveling vehicle 31 in the height direction (the Z direction in FIG. 1). ) And an elevating mast 5 that elevates and guides the elevating body 4 (first elevating body 4a, second elevating body 4b) that supports the article B to be conveyed. The elevating mast 5 includes four support pillars 5S extending along the height direction at corners of a quadrangle when viewed in the height direction.

Each of the first elevating body 4a and the second elevating body 4b has a pair of side surfaces (surfaces represented by M1 and M2 in FIGS. 1 and 2) arranged in the elevating mast 5 in the traveling direction of the traveling carriage 31 (X direction in FIG. 1). ) To move up and down. Each of the lifting bodies 4 is provided with a transfer device 4F that transfers the article B between the storage unit S and itself.
In the present embodiment, the transfer device 4F is configured to support two articles side by side in the article loading / unloading direction at the same time. However, the storage unit S is configured to store only one article in the article loading / unloading direction. In this case, the transfer device 4F is also configured to support one article in the article loading / unloading direction.

As shown in FIGS. 1 and 2, a pair of elevating drive motors G3 (first elevating drive motor G31, second elevating motor 4) for elevating and lowering the elevating body 4 are distributed to both sides in the Y direction at the lower end portion of the elevating mast 5. A lifting drive motor G32) is provided.
The first lifting drive motor G31 is configured to rotationally drive a drum capable of winding or feeding a first lifting wire (not shown), and the other end of the first lifting wire is an up of the first lifting body 4a. Connected to the light section. Similarly, the second raising / lowering drive motor G32 is configured to rotationally drive a drum capable of winding or feeding a second raising / lowering wire (not shown), and the other end of the second raising / lowering wire is the second raising / lowering wire. It is connected to the upright part of the body 4b.
The first elevating drive motor G31 and the second elevating drive motor G32 can be driven independently, so that the first elevating body 4a and the second elevating body 4b can be driven up and down separately. It has become.

  As shown in FIGS. 3 and 4, the traveling carriage 31 has a traveling motor G <b> 1 (first traveling motor G <b> 11, second traveling motor G <b> 12) that drives a pair of drive wheels W <b> 1 arranged side by side in the traveling direction. A pair is provided in the lateral width direction (Y direction in FIGS. 3 and 4) perpendicular to the traveling direction of the traveling carriage 31. A crane controller for controlling the operation of the stacker crane C is stored at one end in the traveling direction of the traveling carriage 31 (upper end of a front driven wheel frame WF2 described later), as shown in FIGS. A control box H is provided.

  Further, as shown in FIGS. 1 and 2, the upper frame 33 of the elevating mast 5 has a pair of upper running wheels WU (first upper running wheels WU 1, second upper running wheels) that are in contact with both side surfaces of the upper rail R 2. An upper travel drive motor G2 for rotating the travel wheels WU2) is attached. The upper travel drive motor G2 is rotationally driven so that the upper frame 33 of the elevating mast 5 moves along the upper rail R2 by a distance equal to the travel movement distance along the travel rail R1 of the travel carriage 31 by the travel motor G1. Thereby, the stacker crane C can be run so that the longitudinal direction of the lifting mast 5 is along the vertical direction.

As shown in FIGS. 3 and 4, a front driven wheel frame WF2 that rotatably supports a driven wheel W2 as a traveling wheel W is attached to the front end of the traveling carriage 31 in the traveling direction. In addition, the front driven wheel frame WF2 is configured to support the driven wheel W2 in a form that regulates a change in the relative position in the vertical direction.
Further, a rear driven wheel frame WF3 that rotatably supports the driven wheel W3 as the traveling wheel W is attached to the rear end of the traveling carriage 31 in the traveling direction. Further, the rear driven wheel frame WF3 is configured to support the driven wheel W3 in a form that regulates a change in the relative position in the vertical direction.

  Between the driven wheel W2 and the driven wheel W3 in the traveling direction of the traveling carriage 31, driving wheels W1 are provided as traveling wheels W that drive the traveling carriage 31 to travel. As shown in FIGS. 3, 5, and 6, the drive wheels W <b> 1 are provided in a pair of a front drive wheel W <b> 1 a and a rear drive wheel W <b> 1 b side by side in the traveling direction, and a wheel frame WF1 (wheel frame WF1a, wheel The frame WF1b) is rotatably supported.

  In the present embodiment, the driven wheel W2 corresponds to the second wheel, the driven wheel W3 corresponds to the third wheel, and the driving wheel W1 corresponds to the first wheel. That is, as the traveling wheel W, the driving wheel W1 whose overlapping range overlaps with the lifting mast 5 in the traveling direction of the traveling carriage 31, the driven wheel W2 positioned in front of the driving wheel W1, and the driving wheel W1 positioned rearward. A driven wheel W3 is provided.

  As shown in FIGS. 4 and 5, the traveling carriage 31 has a central frame portion FC disposed so as to overlap the range in which the elevating mast 5 exists in the traveling direction (X direction), and the central frame portion FC. A second frame portion FF extending to the driving wheel W2 side and a third frame portion FR extending to the driven wheel W3 side with respect to the central frame portion FC are provided. The second frame portion FF, the central frame portion FC, and the third frame portion FR are configured as separate bodies, and the second frame portion FF and the central frame portion FC are connected and fixed to each other by bolt connection. The traveling carriage 31 is configured in a state where the FC and the third frame portion FR are connected and fixed to each other by bolt connection.

  As shown in FIGS. 3 and 4, the central frame portion FC is driven by a pair of travel direction portions FC1 and FC2 that extend along the X direction and are separated in the lateral width direction (Y direction) perpendicular to the X direction. A single member integrally connected by casting, welding, or the like, and having a connecting portion FC3 for connecting the pair of traveling direction portions FC1 and FC2 above the wheel W1 and supporting the lifting mast 5 It is formed with.

  As shown in FIG. 4, the second frame portion FF includes a pair of travel direction frames FF1 and FF2, and each of the pair of travel direction frames FF1 and FF2 extends along the X direction and is Y with respect to each other. They are spaced apart in the direction. The front driven wheel frame WF2 is fastened and fixed to the pair of travel direction frames FF1 and FF2. As shown in FIG. 4, the third frame portion FR includes a pair of travel direction frames FR1 and FR2, and the pair of travel direction frames FR1 and FR2 each extend along the X direction. They are spaced apart from each other in the Y direction. The rear driven wheel frame WF3 is fastened and fixed to the pair of travel direction frames FR1 and FR2.

  As shown in FIG. 5, each of the pair of wheel frames WF1 is driven at a position that is close to the end of the region where the drive wheel W1 is present in the traveling direction and is the lower end of the region where the drive wheel W1 is present in the height direction. An arm portion WFm for fixing the swing shaft portion Wj in the direction along the rotation axis of the wheel W1 is provided. Each of the pair of wheel frames WF1 is swingably supported around the swing axis of the swing shaft portion Wj by each of the pair of attachment members WT1 connected to the central frame portion FC. Further, each of the attachment members WT1 is fixed to the central frame portion FC by bolt fastening, whereby the wheel frame WF1 is attached to the central frame portion FC so as to be movable up and down.

  The pair of mounting members WT1 are provided so as to be located on both outer sides in the arrangement direction of the pair of drive wheels W1, and the swing shaft portion Wj is on the outer side in the arrangement direction of the pair of drive wheels W1. Is located. Further, as shown in FIG. 6, the wheel frame WF1 overlaps with the region where the driving wheel W1 exists in the traveling direction, and is described later on the upper side opposite to the side where the arm portion WFm exists with respect to the rotational axis of the driving wheel W1 A pressed portion WFP that is pressed by the pressing portion SP is formed.

  As shown in FIGS. 3 to 6, the connecting portion FC3 in the central frame portion FC has a pair of pressing portions SP (pressing portions SP1, SP2) that press the pressed portions WFP of the pair of wheel frames WF1a, WF1b. It is attached.

  As shown in FIG. 5, each of the pair of pressing portions SP includes a main body portion that includes a compression spring inside, and a rod portion SPL that protrudes slidably from the main body portion. The rod portion SPL is urged downward by the compression spring, and the lower end of the rod portion SPL of each of the pair of pressing portions SP faces the pressed portion WFP of each of the pair of wheel frames WF1 downward. It is designed to press (see the arrow in FIG. 5). That is, the pressing portion SP that presses the wheel frame WF1 downward is fixed to the traveling carriage 31.

  Further, as shown in FIG. 5, a pressing force adjusting mechanism SPC that adjusts the urging force of the compression spring to the rod portion SPL by moving the position of the upper end portion of the compression spring up and down is provided at the upper end of the main body. Is provided. That is, by adjusting the urging force to the rod portion SPL by the compression spring by the operation of the pressing force adjusting mechanism SPC, the pressing portion SP is applied with the action state of urging the wheel frame WF1 downward and the urging force downward. It is possible to switch to a non-operating state that is reduced rather than a state. The pressing force adjusting mechanism SPC may be configured to switch the urging force applied to the rod portion SPL by the compression spring in stages, or the urging force applied to the rod portion SPL by the compression spring is set to a predetermined pressing force. You may comprise so that it may discretely switch to two states, an action state and the non-action state made into the predetermined release pressing force smaller than a predetermined pressing force. Here, the predetermined pressing force is a pressing force corresponding to a load smaller than the load of the lifting mast 5, for example, a pressing force corresponding to a load of 1/3 to 1/5 of the lifting mast 5. However, the predetermined pressing force is not limited to this as long as it is smaller than the load of the lifting mast 5.

  In this embodiment, the pressing force adjustment mechanism SPC corresponds to a switching mechanism. That is, the pressing portion SP includes a pressing force adjusting mechanism SPC that switches between an operation state in which the wheel frame WF1 is urged downward and a non-operation state in which the downward urging force is reduced as compared with the operation state. The rod portion SPL is arranged in a traveling direction so as to overlap with an existing region of the drive wheel W1 supported by the corresponding wheel frame WF1.

Furthermore, each of a pair of press part SP is distributed and provided before and after the center (indicated by the broken line 5C in FIG. 5) in the traveling direction of the lifting mast 5.
That is, the wheel frame WF1 is provided separately for each of the pair of drive wheels W1 (front side drive wheel W1a, rear side drive wheel W1b), and the pressing portion SP is a pair of wheel frames WF1 (wheel frame WF1a, WF1b). The pressing portion (pressed portion WFP) where the pair of pressing portions SP (pressing portion SP1, pressing portion SP2) presses the wheel frame WF1 is the center in the traveling direction of the elevating mast 5 (A broken line 5C in FIG. 5) is arranged in the front-rear direction.

  FIG. 6 is an exploded perspective view showing an assembled state of the traveling carriage 31, the traveling motor G1, and the pressing portion SP. The travel motor G1 (the first travel motor G11 and the second travel motor G12) includes a drive motor Gm and a transmission Gh, respectively. The transmission Gh includes a shaft Gs that outputs rotation in a direction orthogonal to the rotation output shaft of the drive motor Gm. A torque arm Gt is attached to the transmission Gh. The torque arm Gt is connected to the wheel frame WF1 of the drive wheel W1 to be driven by the travel motor G1. Accordingly, the entire travel motor G1 swings in accordance with the swing of the wheel frame WF1, and the rotational driving force of the shaft Gs is appropriately transmitted to the drive wheels W1.

  In addition, a through hole portion FC3h through which the rod portion SPL of the pressing portion SP passes is formed in the top plate portion at the upper end of the connecting portion FC3. The main body portion of the pressing portion SP is fixed to the upper end portion of the top plate of the connection portion FC3 in a state where the rod portion SPL penetrates the through hole portion FC3h and protrudes below the top plate portion. Further, each of the support columns 5S of the elevating mast 5 is fixed to the top plate portion of the connecting portion FC3.

  Next, a method of removing or attaching the drive wheel W1 from the traveling carriage 31 when performing maintenance or the like will be described with reference to FIG. In the following description, the operation when the front drive wheel W1a is removed or attached will be described as an example, but the operation when the rear drive wheel W1b is removed or attached is also the same, and the description thereof is omitted.

As shown in FIG. 5, the wheel frame WF1a that supports the front drive wheel W1a is fastened and attached to the center frame portion FC with a mounting bolt while being supported by the mounting member WT1.
When the front drive wheel W1a is removed from the traveling carriage 31, as shown in FIG. 7, first, the pressing force adjusting mechanism SPC of the pressing portion SP1 corresponding to the wheel frame WF1a is operated, and the pressing portion SP is not pressed. Switch to state. Subsequently, the mounting bolt that connects the mounting member WT1 and the central frame portion FC is removed, and the fixing of the mounting member WT1 and the central frame portion FC is released.

  With the above operation, the attachment member WT1 can be freely moved with respect to the central frame portion FC. Subsequently, the mounting member WT1a travels over a space (see FIG. 4) formed between the pair of travel direction frames FF1 and FF2 from the space formed between the pair of travel direction portions FC1 and FC2. By sliding along the direction, the attachment member WT1a and the wheel frame WF1a supported by the attachment member WT1a can be removed from the central frame portion FC.

  When the front drive wheel W1a is attached to the traveling carriage 31, the attachment member WT1a and the wheel frame WF1a supported by the attachment member WT1a are placed between the pair of traveling direction frames FF1 and FF2 in reverse to the above procedure. The mounting member WT1a is moved from the formed space over the space formed between the pair of traveling direction portions FC1 and FC2, and the mounting member WT1a is fixed to the fixing portion of the mounting member WT1a provided in the central frame portion FC by the mounting bolt WTb. Install. Thereafter, the pressing force adjusting mechanism SPC of the pressing portion SP1 corresponding to the wheel frame WF1a is operated to switch the pressing portion SP to the pressing state.

In the present embodiment, a route WTK formed over a space formed between the pair of travel direction portions FC1 and FC2 and a space formed between the pair of travel direction frames FF1 and FF2. (See FIG. 4) corresponds to the wheel frame slide path.
That is, the wheel frame WF1 and the mounting member WT1 are placed on the traveling carriage 31 at positions overlapping with the pair of traveling direction frames FF1 and FF2 from the position overlapping with the pair of traveling direction portions FC1 and FC2 when viewed in the lateral width direction (or The wheel frame is slid along the traveling direction from a position overlapping with the pair of traveling direction portions FC1 and FC2 to a position overlapping with the pair of traveling direction frames FR1 and FR2 when viewed in the lateral direction. A slide path is formed.

[Another embodiment]
(1) In the above-described embodiment, the configuration in which the second wheel and the third wheel are driven wheels and the first wheel is a driving wheel has been described. However, the first wheel is configured by using the second wheel and the third wheel as driving wheels. May be configured as a driven wheel. In this case, since the wheel weight of the second wheel and the wheel weight of the third wheel change depending on whether the traveling carriage 31 is moved forward or backward, the traveling carriage 31 is moved backward when the traveling carriage 31 is moved forward. It is preferable to control the driving torque of the travel motor that drives the second wheel and the travel motor that drives the third wheel so that the traction of the entire travel wheel is constant at times.

(2) In the above embodiment, the wheel frame WF1 that supports the first wheel is configured to be swingable around the swing shaft portion Wj, and the wheel frame WF1 swings in the traveling direction with respect to the rotation shaft of the drive wheel W1. The pressed portion WFP located on the opposite side of the moving shaft portion Wj is pressed downward by the pressing portion SP, but the entire wheel frame is configured to be movable along the height direction. It is good also as a structure which arrange | positions press part SP in the upper part of a frame, and presses the whole wheel frame downward by the press part SP.

(3) In the above embodiment, the second frame portion FF, the central frame portion FC, and the third frame portion FR are illustrated as separate bodies. However, the second frame portion FF, the central frame portion FC, You may comprise the 3rd frame part FR with one member. In this case, the one member means that the second frame portion FF, the central frame portion FC, and the third frame portion FR are formed by casting into a shape including the second frame portion FF and the central frame. Forming the part FC and the third frame part FR into a shape or forming the second frame part FF, the central frame part FC and the third frame part FR as separate members, Later, they are inseparably connected by welding or the like.

(4) In the above embodiment, the central frame portion FC is divided into a pair of travel direction portions FC1 and FC2 extending along the X direction and spaced apart in the Y direction, and a pair of travel direction portions FC1 above the drive wheels W1. The connecting portion FC3 that connects the FC2 and supports the elevating mast 5 is shown as an example in which the connecting portion FC3 is formed by a single member that is inseparably formed by casting or welding. FC2 and the connecting portion FC3 may be formed of special members, and they may be frictionally connected later by fastening with bolts or fixing with rivets.

(5) In the above-described embodiment, the configuration in which the wheel frame WF1 is attached to the traveling carriage 31 (the central frame portion FC) via the attachment member WT1 has been described. However, the wheel frame WF1 may be directly attached to the central frame portion FC. .

(6) In the above-described embodiment, the configuration in which the two lifting bodies 4 are lifted and guided by the single lifting mast 5 has been described. However, the number of lifting bodies 4 that are lifted and lowered by the lifting mast 5 is arbitrary. One or three or more lifting bodies 4 may be provided.
Moreover, in the said embodiment, although the single raising / lowering mast 5 was formed including the some support | pillar 5S arranged in the driving | running | working front-back direction, it is not limited to such a structure, For example, it is a pair with the traveling cart 31. These lifting masts may be arranged side by side in the traveling front-rear direction.
In this case, the pair of lifting bodies may be guided by each of the pair of lifting masts, and a single lifting body positioned between the pair of lifting masts is guided by both of the pair of lifting masts. It is good also as a structure. In a case where the pair of lifting bodies are configured to be guided by each of the pair of lifting masts, the loading platform of the lifting body (the portion that includes the transfer device and supports the article B to be transferred) is the pair of lifting masts. It may be arranged so as to be positioned between the two, or may be arranged so that the platform of the lifting body is located on both sides in the direction in which the pair of lifting masts are arranged. Arrangement direction is arbitrary.
In addition, when a pair of lifting masts are provided, a configuration may be provided that includes a connection frame that connects the upper ends of the pair of lifting masts in the traveling front-rear direction, or a configuration that does not include such a connection frame. Also good.

4 Lifting platform 5 Lifting mast 31 Traveling cart B Article W Traveling wheel W1 First wheel W2 Second wheel W3 Third wheel WF1 Wheel frame SP Pressing part SPC Switching mechanism FC Central frame part FC1, FC2 Traveling direction part FC3 Connection part FF First 2 frame portion FR 3rd frame portion FF1, FF2 Travel direction frame FR1, FR2 Travel direction frame WT1 Mounting member WTK Wheel frame slide path

Claims (6)

A traveling carriage that includes traveling wheels and travels along a traveling path; and a lifting mast that guides lifting and lowering a lifting platform that supports an article to be conveyed.
As the traveling wheel, a first wheel whose existence range in the traveling direction of the traveling carriage overlaps with the lifting mast, a second wheel positioned forward of the first wheel, and a rear side of the first wheel. A third wheel for carrying the article,
The first wheel is supported by a wheel frame;
The wheel frame is attached to the traveling carriage so as to be movable up and down with respect to the traveling carriage,
A pressing part that presses the wheel frame downward is fixed to the traveling carriage,
The said press part is an article conveyance apparatus arrange | positioned overlapping with the presence area | region of the said 1st wheel by planar view.   2. The article conveying device according to claim 1, wherein the second wheel and the third wheel are driven wheels, and the first wheel is a driving wheel that travels and drives the traveling carriage. A pair of the drive wheels are provided side by side in the traveling direction,
The wheel frame is provided separately for each of the pair of drive wheels,
The pressing part is provided separately for each of the pair of wheel frames, and the pressing points where the pair of pressing parts press the wheel frame are front and rear with respect to the center of the elevating mast in the traveling direction. The article conveying apparatus according to claim 2, wherein the article conveying apparatus is arranged in a distributed manner. A central frame portion disposed so that the traveling carriage overlaps with the range of the lifting mast in the traveling direction; a second frame portion extending toward the second wheel with respect to the central frame portion; A third frame portion extending toward the third wheel with respect to the central frame portion,
The central frame portion connects a pair of traveling direction portions extending along the traveling direction and spaced apart in a lateral direction orthogonal to the traveling direction, and the pair of traveling direction portions above the first wheel. And a connecting portion that supports the elevating mast,
The second frame portion includes a pair of travel direction frames, and the pair of travel direction frames extend along the travel direction and are spaced apart from each other in the lateral width direction.
The third frame portion includes a pair of traveling direction frames, and the pair of traveling direction frames extend along the traveling direction and are spaced apart from each other in the lateral width direction.
The wheel frame is swingably supported by an attachment member connected to the central frame portion,
The pressing portion includes a switching mechanism that switches between an operation state for urging the wheel frame downward and a non-operation state for reducing a downward urging force from the operation state,
In the traveling carriage, the wheel frame and the mounting member are moved in the traveling direction from a position overlapping with the pair of traveling direction frames from a position overlapping with the pair of traveling direction frames as viewed in the lateral direction. The article conveyance device according to any one of claims 1 to 3, wherein a wheel frame slide path that is slid along is formed. A central frame portion disposed so that the traveling carriage overlaps with the range of the lifting mast in the traveling direction; a second frame portion extending toward the second wheel with respect to the central frame portion; A third frame portion extending toward the third wheel with respect to the central frame portion,
The second frame part, the central frame part, and the third frame part are configured as separate bodies, and the second frame part and the central frame part are connected and fixed to each other, and the central frame part and the first frame part are connected to each other. The traveling carriage is configured in a state where the three frame portions are connected and fixed to each other,
The article conveyance facility according to any one of claims 1 to 4, wherein the wheel frame is attached to the central frame portion.   The article conveying apparatus according to claim 5, wherein the central frame portion is formed of a single member.

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