JP2017160015A - Pallet transport device and system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pallet transport device which enables rigidity of a pallet to be easily improved, and to provide a system.SOLUTION: A pallet transport device 3 includes: vertical transport rollers 31 which contact with vertical rails 21 when a pallet 2 is transported in a vertical direction; lateral transport rollers 32 which contact with lateral rails 22 when the pallet 2 is transported in a lateral direction; vertical transport guide rollers 33 which contact with vertical side parts of the pallet 2 when the pallet 2 is transported in the vertical direction; and lateral transport guide rollers 34 which contact with lateral side parts of the pallet 2 when the pallet 2 is transported in the lateral direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a pallet transport apparatus and system, and more particularly to a pallet transport apparatus and system capable of transporting a pallet on which an object is placed in different directions.

  A system for placing an object on a pallet and transporting the object to a desired place is employed in various facilities. For example, in a parking device, a car is placed on a pallet and transported to a predetermined location for storage, or a pallet on which a car is placed is transported from a storage location to a loading / unloading port and supplied to a user. Yes. In an automatic warehouse such as a distribution center or a factory, products and parts are placed on a pallet and stored in a predetermined place, or products and parts are taken out from a predetermined place and supplied to an operator.

  These pallet transport systems are configured such that the pallet can be moved in the vertical and horizontal directions in order to transport the object to a predetermined place. For example, vertical rails and horizontal rails are arranged in a cross-beam shape on the lower surface of a pallet on which an automobile is placed, and a plurality of transport rollers that engage with these rails and transport the pallet are configured to be freely turnable in the transport direction. There is a transport device (see, for example, Patent Document 1).

  In such a transport apparatus, in order to prevent the transport roller from coming off the rail during transport of the pallet, support rollers provided alongside the transport roller are brought into contact with both side portions of the rail. In this case, the rail at the intersection where the vertical rail and the horizontal rail intersect with each other in the conveyance direction together with the conveyance roller and the support roller in order to avoid the support roller from interfering with the rail when the conveyance roller reaches the intersection. It is configured to turn freely.

JP-A 63-74804

  However, in the conveyance apparatus described in Patent Document 1, since the rails arranged on the pallet are configured to be freely turned at the intersection, the rails are discontinuous at the intersection. Therefore, since the rigidity of the pallet is lowered at the portion where the rails are discontinuous, there is a problem that a countermeasure for compensating the rigidity is required.

  The present invention has been devised in view of such problems, and an object of the present invention is to provide a pallet conveying apparatus and system that can easily improve the rigidity of the pallet.

  According to the present invention, an upper surface portion on which an object is placed and a lower surface portion on which a first rail extending in a first direction and a second rail extending in a second direction are arranged are provided. A pallet conveying device for conveying a pallet, wherein the first conveying roller that contacts the first rail when conveying the pallet in the first direction, and when conveying the pallet in the second direction A second conveying roller that contacts the second rail; a first guide roller that contacts a side portion of the pallet in the first direction when the pallet is conveyed in the first direction; And a second guide roller that abuts a side portion of the pallet in the second direction when transported in the second direction.

  In addition, according to the present invention, the plurality of pallet transports comprising: a plurality of pallets on which an object is placed; and a plurality of pallet transport devices that transport the plurality of pallets in a first direction or a second direction. By arranging the apparatus in the first direction and the second direction and conveying the plurality of pallets in the first direction and the second direction on the plurality of pallet conveying devices, A pallet transport system for carrying an object in and out, wherein the pallet transport device includes an upper surface portion on which the object is placed, a first rail extending in a first direction, and a second rail extending in a second direction. A pallet having a lower surface portion on which two rails are disposed, a first conveying roller that contacts the first rail when conveying the pallet in the first direction, and the pallet Carry in the second direction A second conveying roller that contacts the second rail when performing, a first guide roller that contacts a side portion of the pallet in the first direction when conveying the pallet in the first direction, And a second guide roller that abuts against a side portion of the pallet in the second direction when the pallet is conveyed in the second direction.

  The pallet conveying device and the pallet conveying system include an elevating means for moving up and down one of the first conveying roller and the second conveying roller, and the first guide roller corresponding to the one conveying roller. And switching means capable of switching between a state in which one of the second guide rollers is in contact with a side portion of the pallet and a state in which the guide roller is separated from the pallet.

  At this time, when the pallet is transported by the other transport roller of the first transport roller and the second transport roller, the one transport roller is lowered by the lifting means from the other transport roller. The switching means may separate the one guide roller from the pallet.

  On the other hand, when the pallet is transported by the one transport roller, the pallet interferes with one of the first guide roller and the second guide roller by the lifting / lowering means. It may be raised to a position where it does not, and the one guide roller may be brought into contact with the side of the pallet by the switching means.

  Further, the pallet conveying device and the pallet conveying system are separated from a state in which one of the first guide roller and the second guide roller is in contact with a side portion of the pallet and the pallet. A second switching means that can be switched to a state in which the pallet is transported, and when the pallet is transported by the one transporting roller, the second switching means separates the other guide roller from the pallet, and the lifting means Thus, the one conveying roller may be raised above the other conveying roller, and the one guide roller may be brought into contact with the side portion of the pallet by the switching means.

  Further, the first rail and the second rail have, for example, a continuous intersection without breaking.

  According to the pallet conveying apparatus and system according to the present invention described above, the first guide roller and the second guide roller that suppress the wheel removal of the first conveying roller and the second conveying roller at the time of pallet conveying are arranged on the side part (outer peripheral part) of the pallet. The first guide roller and the second guide roller can be removed from the first rail and the second rail of the pallet, and the first rail or the second rail and the first guide roller or the second guide roller Can be avoided. Therefore, the first rail and the second rail can be formed continuously without being interrupted at the intersection, and the rigidity of the pallet can be easily improved.

It is a plane sectional view of the pallet conveyance system concerning one embodiment of the present invention. It is a bottom view of the pallet shown in FIG. It is a top view of the pallet conveying apparatus shown in FIG. It is sectional drawing of the pallet conveying apparatus set to the conveyance state of the vertical direction, (a) is the sectional view on the aa line in FIG. 3, (b) shows the sectional view on the bb line in FIG. . It is sectional drawing of the pallet conveying apparatus set to the conveyance state of a horizontal direction, (a) is the sectional view on the aa line in FIG. 3, (b) shows the sectional view on the bb line in FIG. . It is a top view of the pallet conveying apparatus which concerns on 2nd embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. In addition, the pallet conveyance system 1 which concerns on one Embodiment shown in FIG. 1 contains the pallet conveyance apparatus 3 which concerns on 1st embodiment.

  The pallet transport system 1 according to an embodiment of the present invention includes, for example, a plurality of pallets 2 on which an object W is placed and a plurality of pallets 2 in a vertical direction (X direction in the figure) or as illustrated in FIG. And a plurality of pallet conveying devices 3 for conveying in the lateral direction (Y direction in the figure). Further, the pallet transport system 1 arranges a plurality of pallet transport devices 3 in the vertical direction and the horizontal direction, and transports the plurality of pallets 2 in the vertical direction and the horizontal direction on the plurality of pallet transport devices 3. In this system, the object W is carried in and out. In this specification, “vertical direction” corresponds to “first direction”, and “lateral direction” corresponds to “second direction”.

  The pallet transport system 1 illustrated in FIG. 1 is a parking device that is installed in, for example, a multistory parking lot or an underground parking lot and can accommodate a plurality of automobiles that are objects W. Although not shown, the pallet transport system 1 according to the present embodiment is also applied to a warehouse facility such as an automatic warehouse in which an object W such as a part or a product is accommodated in a predetermined place and taken out and supplied as necessary. be able to.

  Further, the pallet transport system 1 includes, for example, a floor surface 11 and a wall surface 12 that form a storage space, and an entrance / exit 13 that carries an object W in and out, and is on the floor surface 11 (for example, on the floor surface 11). On the pedestal 11a, the pallet transfer device 3 is arranged in the vertical direction (X direction in the figure) and the horizontal direction (Y direction in the figure). In the embodiment shown in FIG. 1, twelve pallet conveying devices 3 are arranged in four columns in the vertical direction and three rows in the horizontal direction, and one similar pallet conveying device 3 is also arranged at the entrance / exit 13. However, it is not limited to such an arrangement.

  On the pallet transport apparatus 3 arranged in an array, for example, the number of pallet transport apparatuses 3 is equal to the number of -1 pallets 2 (here, 11 sheets). By arranging a smaller number of pallets 2 than the number of pallet conveying devices 3 arranged in alignment, it is possible to ensure at least one pallet conveying device 3 on which no pallet 2 is placed, and to save the space. Utilizing this, the pallet 2 can be transported to an arbitrary position by moving it like a sliding block puzzle. In addition, the pallet conveying apparatus 3 arrange | positioned at the entrance / exit 13 may be arrange | positioned on a moving trolley | bogie or a raising / lowering trolley | bogie.

  The pallet 2 is a member for placing the object W on the upper surface portion 2a. The pallet 2 is, for example, a plate material having a rectangular outer shape as illustrated, but is not limited to such a shape, and may be a box shape or the like. For example, as shown in FIG. 2, two vertical rails 21 extending in the vertical direction and two horizontal rails 22 extending in the horizontal direction are orthogonal to the lower surface portion 2 b of the pallet 2. Is arranged.

  Moreover, the vertical rail 21 and the horizontal rail 22 have the continuous cross | intersection part 23, without interrupting, as shown in figure. That is, the vertical rail 21 and the horizontal rail 22 have a shape connected to each other at each crossing portion 23. For example, as illustrated, each crossing portion 23 has a substantially cross shape. Therefore, the pallet 2 is sufficiently rigid by the vertical rail 21 and the horizontal rail 22. An outer frame 24 having substantially the same height as the vertical rail 21 and the horizontal rail 22 is formed on the outer peripheral portion of the pallet 2. The outer frame 24 can further improve the rigidity of the pallet 2.

  The pallet transport device 3 according to the first embodiment shown in FIG. 3 includes an upper surface portion 2a on which the object W is placed, a vertical rail 21 extending in the vertical direction, and a horizontal rail 22 extending in the horizontal direction. It is an apparatus which conveys the pallet 2 provided with the made lower surface part 2b. For example, in this embodiment, a pair of vertical rails 21 arranged in parallel and a pair of horizontal rails 22 arranged in parallel are arranged so as to be orthogonal to each other. In the present specification, “vertical rail 21” corresponds to “first rail”, and “lateral rail 22” corresponds to “second rail”.

  Further, the pallet conveying device 3 includes a vertical conveying roller 31 that contacts the vertical rail 21 when conveying the pallet 2 in the vertical direction, and a horizontal conveying roller 32 that contacts the horizontal rail 22 when conveying the pallet 2 in the horizontal direction. The vertical conveyance guide roller 33 that contacts the vertical side of the pallet 2 when the pallet 2 is conveyed in the vertical direction, and the horizontal side of the pallet 2 when the pallet 2 is conveyed in the horizontal direction. A horizontal conveyance guide roller 34 in contact therewith. In this specification, “vertical transport roller 31” corresponds to “first transport roller”, “horizontal transport roller 32” corresponds to “second transport roller”, and vertical transport guide roller 33 corresponds to “first transport roller”. The lateral conveyance guide roller 34 corresponds to a “second guide roller”.

  Further, four third guide rollers 37 arranged at positions corresponding to the corners of the pallet 2 may be arranged on the floor surface 11 or the pedestal 11 a of the pallet conveying device 3. The third guide roller 37 is configured to abut on the side of the pallet 2 when the pallet 2 is transported in the vertical direction and when transported in the horizontal direction. By arranging the third guide roller 37, the stability when the pallet 2 is transferred between the pallet conveying devices 3 can be improved.

  A plurality of the vertical conveying rollers 31 are arranged along the lower surface of the vertical rail 21, and convey the pallet 2 in the vertical direction (X direction) by rolling in contact with the lower surface of the vertical rail 21. Here, the six vertical conveying rollers 31 are arranged for the two vertical rails 21, but the number and arrangement are not limited thereto. Specifically, as shown in FIG. 4B, the vertical conveying roller 31 is rotatably supported by a bracket 311 fixed on the pedestal 11a. The rotation axis of the vertical conveyance roller 31 is arranged along the horizontal direction (Y direction).

  Further, the vertical conveying roller 31 disposed on the most upstream side of the one vertical rail 21 and the most downstream side of the other vertical rail 21 has a drive motor 312 and constitutes a so-called drive roller. The remaining vertical conveying rollers 31 do not have the drive motor 312 and constitute so-called driven rollers. The configuration of the vertical conveying roller 31 described above is merely an example, and is not limited to this configuration. For example, the arrangement of the vertical conveyance rollers 31 having the drive motor 312 may be changed, or the drive motors 312 may be connected to all the vertical conveyance rollers 31.

  A plurality of the horizontal conveying rollers 32 are arranged along the lower surface of the horizontal rail 22, and convey the pallet 2 in the horizontal direction (Y direction) by abutting and rolling on the lower surface of the horizontal rail 22. Here, six horizontal conveying rollers 32 are arranged for the two horizontal rails 22, but the number and arrangement are not limited thereto. Note that the rotation axis of the horizontal conveyance roller 32 is arranged along the vertical direction (X direction).

  Specifically, the horizontal conveyance roller 32 is rotatably supported by a bracket 321 that is disposed on the base 11a so as to be movable up and down. The bracket 321 is configured so as to be able to pivotally support, for example, three horizontal transport rollers 32 arranged in parallel in the horizontal direction. Moreover, the guide member 322 which guides the bracket 321 at the time of raising / lowering may be arrange | positioned at the both ends of the bracket 321. FIG.

  Further, the horizontal conveying roller 32 disposed on the most upstream side of one horizontal rail 22 and the most downstream side of the other horizontal rail 22 has a drive motor 323, and constitutes a so-called drive roller. Further, the remaining lateral conveyance rollers 32 do not have the drive motor 323 and constitute so-called driven rollers. Note that the configuration of the horizontal conveyance roller 32 described above is merely an example, and is not limited to such a configuration. For example, the arrangement of the horizontal conveyance rollers 32 having the drive motor 323 may be changed, or the drive motors 323 may be connected to all the horizontal conveyance rollers 32. Moreover, you may make it change the structure of the bracket 321 and the guide member 322 suitably.

  In addition, the pallet conveying device 3 includes an elevating unit 35 that elevates the horizontal conveying roller 32. For example, as shown in FIGS. 4A and 5A, the elevating means 35 includes a hydraulic cylinder 351 fixed to the back surface of the pedestal 11a and a cylinder rod 352 disposed on the surface of the pedestal 11a. And an elevating plate 353 fixed to the distal end portion. A bracket 321 on which the horizontal conveyance roller 32 is pivotally supported is fixed to the elevating plate 353.

  According to the lifting / lowering means 35, by extending / contracting the cylinder rod 352, the horizontal conveying roller 32 corresponding to each horizontal rail 22 can be lifted / lowered in the vertical direction (Z direction in the figure) via the lifting / lowering plate 353. Here, the case where the three horizontal conveying rollers 32 are simultaneously lifted and lowered by the two hydraulic cylinders 351 is illustrated, but the number of the hydraulic cylinders 351 is arbitrary. In addition, a hydraulic cylinder 351 may be disposed on each of the horizontal conveyance rollers 32 and moved up and down in synchronization.

  In addition, the structure of the raising / lowering means 35 mentioned above is a mere illustration, Comprising: It is not limited to this structure. For example, the elevating means 35 may use a jack mechanism such as a pantograph jack or a hydraulic jack, or an air cylinder, an electric cylinder, a ball screw mechanism, a cam mechanism, or a wedge-shaped slider is moved in the horizontal direction. It is also possible to use a mechanism that displaces in the vertical direction, a booster mechanism, or the like.

  A plurality of the vertical conveyance guide rollers 33 are arranged along both sides in the vertical direction (X direction) of the pallet 2 and constitute a guide roller for conveying the pallet 2 in the vertical direction. As shown in FIG. 4 (b), the vertical conveyance guide roller 33 has a vertical rotation shaft, and the pallet 2 is placed on the vertical conveyance roller 31 so as to contact the side of the pallet 2. The position is fixed at the contact height. Although not shown, the vertical conveyance guide roller 33 is supported on the floor surface 11 or the pedestal 11a.

  A plurality of the lateral conveyance guide rollers 34 are arranged along both sides of the pallet 2 in the lateral direction (Y direction), and constitute a guide roller for conveying the pallet 2 in the lateral direction. By the way, in the pallet conveying device 3 according to the present embodiment, as will be described later, the pallet 2 is moved in the horizontal direction rather than the height position of the pallet 2 when the pallet 2 is conveyed in the vertical direction (see FIG. 4A). Since the height position (see FIG. 5A) of the pallet 2 when transporting to the upper side is higher, the horizontal transport guide roller 34 is disposed at a position higher than the vertical transport guide roller 33. Accordingly, when the pallet 2 is conveyed in the vertical direction, the horizontal conveyance guide roller 34 interferes with the pallet 2.

  Therefore, the pallet conveyance device 3 according to the present embodiment is separated from the pallet 2 from the state in which the lateral conveyance guide roller 34 corresponding to the horizontal conveyance roller 32 provided with the elevating means 35 is in contact with the side of the pallet 2. Switching means 36 that can be switched between states is provided. In the present embodiment, if “the lateral conveyance guide roller 34 having the switching unit 36” is expressed as “one guide roller”, the “vertical conveyance guide roller 33 without the switching unit 36” is “the other guide roller”. Corresponds to "Roller".

  For example, as shown in FIG. 3, the switching unit 36 includes a rotation shaft 361 extending in the lateral direction (Y direction) and having the lateral conveyance guide rollers 34 fixed to both ends, and a substantially central portion of the rotation shaft 361. A stopper 362 that is disposed and protrudes in the vertical direction (X direction) from the rotation shaft 361, a drive motor 363 that rotationally drives the rotation shaft 361, a stopper receiver 364 that locks the stopper 362, and the stopper receiver 364 with respect to the stopper 362. And a cylinder 365 that moves forward and backward.

  When the pallet 2 is transported in the lateral direction (Y direction), as shown in FIG. 5A, the switching means 36 pivots the lateral transport guide roller 34 to move to the side of the pallet 2. In this state, the stopper receiver 364 is inserted below the stopper 362 so that the stopper 362 is locked and the lateral conveyance guide roller 34 is held upright.

  On the other hand, when the pallet 2 is transported in the vertical direction (X direction), as shown in FIG. 4A, the stopper receiver 364 is pulled out from below the stopper 362 by the switching means 36, so that the stopper 362 is moved. The locked state is released, and the lateral conveyance guide roller 34 is revolved by its own weight or the cylinder 365 to be retracted to a position below the pallet 2.

  The configuration of the switching unit 36 described above is merely an example, and is not limited to this configuration. For example, the switching unit 36 may be disposed in each of the lateral conveyance guide rollers 34, or may be configured using an air cylinder, an electric cylinder, a cam mechanism, a ball screw mechanism, a gear mechanism, or the like.

  Here, the case where the pallet 2 is conveyed in the vertical direction (X direction) will be described with reference to FIGS. 4 (a) and 4 (b). In this embodiment, since the elevating means 35 is disposed only on the horizontal conveying roller 32, “conveying the pallet 2 in the vertical direction” means that “the pallet 2 is moved by the vertical conveying roller 31 without the elevating means 35. It means “to carry”. Further, in the present embodiment, if “the horizontal conveying roller 32 provided with the lifting means 35” is expressed as “one conveying roller”, “the vertical conveying roller 31 not provided with the lifting means 35” is “the other conveying roller”. It corresponds to.

  First, the horizontal conveyance roller 32 (one conveyance roller) is lowered by the elevating means 35 below the vertical conveyance roller 31 (the other conveyance roller). When the horizontal conveyance roller 32 is lowered while the pallet 2 is placed on the horizontal conveyance roller 32, the pallet 2 placed on the horizontal conveyance roller 32 is also lowered, and the vertical rail 21 becomes the vertical conveyance roller 31. The pallet 2 is placed on the vertical conveying roller 31. At this time, the vertical conveyance guide rollers 33 abut on both sides of the pallet 2 in the vertical direction. Next, the lateral conveying guide roller 34 (one guide roller) is separated from the pallet 2 by the switching means 36.

  In this state, by operating the drive motor 312, the pallet 2 is transported in the vertical direction (X direction) by the vertical transport roller 31 in contact with the vertical rail 21. At this time, since the vertical conveyance guide roller 33 is in contact with both sides in the vertical direction (X direction) of the pallet 2, it is possible to prevent the vertical conveyance roller 31 from being removed, and the pallet 2 is in a stable state. Can be conveyed in the vertical direction. Further, since the horizontal conveyance guide roller 34 is retracted to a position below the pallet 2, it is possible to avoid interference with the pallet 2 conveyed in the vertical direction.

  Next, the case where the pallet 2 is conveyed in the horizontal direction (Y direction) will be described with reference to FIGS. 5 (a) and 5 (b). In the present embodiment, since the lifting means 35 is disposed only on the horizontal transport roller 32, “transporting the pallet 2 in the lateral direction” means “the horizontal transport roller 32 including the lifting means 35 (one of the transports). It means that the pallet 2 is conveyed by a roller).

  First, the horizontal conveyance roller 32 (one conveyance roller) is raised by the elevating means 35 to a position where it does not interfere with the vertical conveyance guide roller 33 (the other guide roller) not provided with the switching means 36. When the horizontal conveyance roller 32 is raised while the pallet 2 is placed on the vertical conveyance roller 31, the horizontal rail 22 comes into contact with the horizontal conveyance roller 32, and the pallet 2 is placed on the horizontal conveyance roller 32. . In this embodiment, since the height position of the vertical conveyance guide roller 33 is fixed, the horizontal conveyance roller 32 is further raised to a position where the pallet 2 does not interfere with the vertical conveyance guide roller 33 during conveyance.

  Next, the lateral conveying guide roller 34 (one guide roller) is brought into contact with the side portion of the pallet 2 by the switching means 36. By operating the drive motor 323 in this state, the pallet 2 is transported in the lateral direction (Y direction) by the lateral transport roller 32 that contacts the lateral rail 22. At this time, since the lateral conveyance guide roller 34 is in contact with both sides in the lateral direction (Y direction) of the pallet 2, it is possible to prevent the lateral conveyance roller 32 from being removed, and the pallet 2 is in a stable state. Can be transported in the horizontal direction.

  According to the pallet conveyance device 3 according to the above-described embodiment, the vertical conveyance guide roller 33 and the horizontal conveyance guide roller 34 are arranged on the side portion (outer peripheral portion) of the pallet 2, so that the vertical rail 21 and the horizontal rail of the pallet 2 are arranged. The vertical conveyance guide roller 33 and the horizontal conveyance guide roller 34 can be removed from the rail 22, and interference between the vertical rail 21 or the horizontal rail 22 and the vertical conveyance guide roller 33 or the horizontal conveyance guide roller 34 can be avoided. Therefore, the vertical rail 21 and the horizontal rail 22 can be formed continuously without being interrupted at the intersection 23, and the rigidity of the pallet 2 can be easily improved.

  Further, according to the present embodiment, a conventional mechanism for turning the intersection of the rails can be omitted, and the necessity for taking measures to reinforce the rigidity of the pallet 2 can be reduced. Therefore, according to the present embodiment, it is possible to simplify the apparatus and reduce the cost.

  In the above-described embodiment, the lifting / lowering means 35 is arranged on the horizontal conveyance roller 32 and the switching means 36 is arranged on the horizontal conveyance guide roller 34. However, the raising / lowering means 35 is arranged on the vertical conveyance roller 31 and the switching means 36 is arranged. 36 may be arranged on the vertical conveyance guide roller 33. About this modification, since the operation | movement at the time of conveying the pallet 2 in the vertical direction and the operation | movement at the time of conveying the pallet 2 in the above-mentioned embodiment are only switched, detailed description is abbreviate | omitted here. To do.

  Next, the pallet transport device 3 according to the second embodiment of the present invention will be described with reference to FIG. In addition, about the component in common with the pallet conveying apparatus 3 which concerns on 1st embodiment mentioned above, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  The pallet conveyance device 3 according to the second embodiment shown in FIG. 6 is a vertical conveyance corresponding to the vertical conveyance roller 31 (the other conveyance roller) that does not include the elevating means 35 in the pallet conveyance device 3 according to the first embodiment. A second switching means 38 that can switch between a state in which the guide roller 33 (the other guide roller) is in contact with the side of the pallet 2 and a state in which the guide roller 33 is separated from the pallet 2 is provided.

  Similar to the switching unit 36, the second switching unit 38 is disposed at a rotation shaft 381 that extends in the vertical direction (X direction) and to which the vertical conveyance guide roller 33 is fixed at both ends, and at a substantially central portion of the rotation shaft 381. A stopper 382 protruding in the lateral direction (Y direction) from the rotation shaft 381, a drive motor 383 that rotationally drives the rotation shaft 381, a stopper receiver 384 that locks the stopper 382, and the stopper receiver 384 with respect to the stopper 382. And a cylinder 385 for advancing and retreating. Since the operation of the second switching means 38 is the same as that of the switching means 36, detailed description thereof is omitted here.

  When the pallet 2 is transported in the horizontal direction, that is, when the pallet 2 is transported by the lateral transport roller 32 (one transport roller) provided with the lifting / lowering means 35, the vertical transport guide roller 33 is transported by the second switching means 38. (The other guide roller) is separated from the pallet 2, the horizontal conveying roller 32 (one conveying roller) is raised above the vertical conveying roller 31 (the other conveying roller) by the lifting / lowering means 35, and the horizontal conveying guide by the switching means 36. The roller 34 (one guide roller) may be brought into contact with the side of the pallet 2.

  In the pallet conveying device 3 according to the second embodiment, the vertical conveying guide roller 33 in addition to the horizontal conveying guide roller 34 can be brought into contact with or retracted, so that the horizontal conveying roller 32 is raised and the pallet 2 is moved. When placed on the horizontal conveyance roller 32, the vertical conveyance guide roller 33 can be retracted below the pallet 2, and the pallet 2 can be simply raised by raising the horizontal conveyance roller 32 slightly above the vertical conveyance roller 31. Can be transported laterally.

  In the second embodiment described above, the lifting / lowering means 35 is arranged on the horizontal conveyance roller 32, but the switching means 36 is arranged on the horizontal conveyance guide roller 34, and the second switching means 38 is arranged on the vertical conveyance guide roller 33. Because of the arrangement, even when the lifting means 35 is arranged on the vertical conveyance roller 31, the pallet 2 can be conveyed in the vertical direction and the horizontal direction by the same operation.

  Moreover, in the pallet conveying apparatus 3 according to the first embodiment and the second embodiment described above, the vertical conveying roller 31 and the horizontal conveying roller 32 are separately arranged, but the vertical conveying roller 31 and the horizontal conveying roller are arranged. Instead of 32, a transport roller configured to be able to turn in the vertical direction or the horizontal direction and to be movable up and down may be arranged at the intersection 23 of the vertical rail 21 and the horizontal rail 22. Even in such a configuration, the vertical conveyance guide roller 33 and the horizontal conveyance guide roller 34 are arranged on the side portion (outer peripheral portion) of the pallet 2, so that the vertical rail 21 and the horizontal rail 22 are disconnected at the intersection 23. It can form continuously, without.

  The present invention is not limited to the above-described embodiments, and it is needless to say that various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Pallet conveyance system 2 Pallet 2a Upper surface part 2b Lower surface part 3 Pallet conveyance apparatus 11 Floor surface 11a Base 12 Wall surface 13 Entrance 21 Vertical rail 22 Horizontal rail 23 Crossing part 24 Outer frame 31 Vertical conveyance roller 32 Horizontal conveyance roller 33 Vertical conveyance guide roller 34 Horizontal transport guide roller 35 Lifting means 36 Switching means 37 Third guide roller 38 Second switching means 311 Bracket 312 Drive motor 321 Bracket 322 Guide member 323 Drive motor 351 Hydraulic cylinder 352 Cylinder rod 353 Lift plate 361, 381 Rotating shaft 362 382 Stopper 363, 383 Drive motor 364, 384 Stopper receiver 365, 385 Cylinder

Claims (7)

Pallet conveyance for conveying a pallet having an upper surface portion on which an object is placed and a lower surface portion on which a first rail extending in a first direction and a second rail extending in a second direction are arranged A device,
A first transport roller that contacts the first rail when transporting the pallet in the first direction;
A second transport roller that contacts the second rail when transporting the pallet in the second direction;
A first guide roller that contacts the side of the pallet in the first direction when the pallet is conveyed in the first direction;
A second guide roller that contacts the side of the pallet in the second direction when the pallet is conveyed in the second direction;
A pallet conveying device comprising:   Elevating means for raising and lowering one of the first conveying roller and the second conveying roller, and one of the first guide roller and the second guide roller corresponding to the one conveying roller The pallet conveying apparatus according to claim 1, further comprising switching means that can switch between a state in which the guide roller is in contact with a side portion of the pallet and a state in which the guide roller is separated from the pallet.   When the pallet is transported by the other transport roller of the first transport roller and the second transport roller, the one transport roller is lowered from the other transport roller by the elevating means, and the switching is performed. 3. The pallet transport device according to claim 2, wherein the one guide roller is separated from the pallet by means.   When the pallet is transported by the one transport roller, the pallet does not interfere with any one of the first guide roller and the second guide roller by the elevating means. The pallet conveying apparatus according to claim 2, wherein the one guide roller is brought into contact with a side portion of the pallet by the switching means. Second switching means capable of switching between a state in which one of the first guide roller and the second guide roller is in contact with a side portion of the pallet and a state in which the guide roller is separated from the pallet. ,
When the pallet is transported by the one transport roller, the second switching unit separates the other guide roller from the pallet, and the lifting unit lifts the one transport roller from the other transport roller. The pallet conveying apparatus according to claim 2, wherein the pallet conveying device is raised and the one guide roller is brought into contact with a side portion of the pallet by the switching means.   The pallet transport device according to claim 1, wherein the first rail and the second rail have continuous intersections without being interrupted. A plurality of pallets on which an object is placed; and a plurality of pallet transport devices that transport the plurality of pallets in a first direction or a second direction; and the plurality of pallet transport devices in the first direction and A pallet transport system that carries the object in and out by aligning and arranging in the second direction and transporting the plurality of pallets in the first direction and the second direction on the plurality of pallet transport devices. Because
The said pallet conveying apparatus is a pallet conveying apparatus as described in any one of Claims 1-6, The pallet conveying system characterized by the above-mentioned.