JPH0581111U - Stacker crane - Google Patents

Abstract

(57) [Summary] [Purpose] The work of unloading the stacker crane from the platform and the work of loading the platform in parallel are performed in parallel. [Structure] A lifter 35 of a stacker crane 30 is provided with a roller conveyor 37 and a slide fork 41 that can be lifted and lowered by a lifter 40. Roller conveyor 37
Is rotationally driven in a state in which the lifting platform 35 is in the loading / unloading station 20, and transfers the load 11 on the lifting platform 35 to the loading / unloading conveyor 22. The slide fork 41 operates in parallel with the operation of the roller conveyor 37 to load the load of the storage conveyor on the lift table 35.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a stacker crane that conveys a load between a rack and a loading / unloading station in an automated warehouse.

[0002]

[Prior Art]

 In a conventional automatic warehouse, a stacker crane travels, for example, in a crane passage provided between two rows of racks, carries a load conveyed from an warehousing conveyor into a rack, and unloads a load from a rack to an unloading conveyor. The stacker crane uses a slide fork that is slidable on the lifting platform to transfer loads to and from the rack or loading / unloading conveyor.

[0003] The stacking platform of the stacker crane has a position where the upper surface of the fork is slightly higher than the upper surface of the rack and can be unloaded onto the load receiving member (hereinafter referred to as the upper level) when transferring the load to and from the load receiving member of the rack. Or the top of the fork is slightly below the top of the rack and stops at a position where the load on the load receiving member can be scooped onto the fork (hereinafter referred to as the lower level).

When a load is unloaded from the rack, after the slide fork projects in the rack direction at the lower level of the lift table, the lift table rises to the upper level and lifts the load on the load receiving member. In this state, the slide fork is pulled back onto the lift, and the load is transferred onto the lift. Then, the stacker crane travels and the load is conveyed to the delivery conveyor. In the delivery conveyor, the slide fork projects to the conveyor side at the upper level of the elevator, and then the elevator descends to the lower level to transfer the load on the slide fork to the delivery conveyor. The warehousing operation follows the route opposite to the above and is performed by the same operation.

[0005]

[Problems to be Solved by the Invention] In the above-mentioned conventional stacker crane, since loading and unloading of the load to and from the elevator is performed only by the slide forks, for example, the unloading work from the elevator to the delivery conveyor and the operation from the loading conveyor to the elevator There was a problem that the loading work could not be done in parallel and it took time. An object of the present invention is to provide a stacker crane that can perform the unloading work from the lifting platform and the loading work on the lifting platform in parallel and can significantly reduce the working time.

[0006]

[Means for Solving the Problems]

 The stacker crane according to the present invention is provided with an elevating platform, a slide fork that is horizontally projectable on the elevating platform, and is used for loading and unloading a load on the elevating platform, and is provided on the elevating platform. It is equipped with a roller conveyor that moves the load in the specified direction and unloads it from the elevator.

[0007]

【Example】

 The present invention will be described below with reference to illustrated embodiments. FIG. 1 shows an automated warehouse to which a stacker crane 30 according to an embodiment of the present invention is applied. In this figure, the stacker crane 30 travels along rails 32 provided in the crane passage 31, and transfers the load 11 between the rack 10 and the loading / unloading station 20 which are erected on both sides of the crane passage 31.

In the loading / unloading station 20, a loading conveyor 21 is provided on the side of the end of the crane passage 31 (upper side in the figure), and an exiting conveyor 22 is provided on an extension of the crane passage 31. The storage conveyor 21 is configured to rotatably support a large number of rollers 23 arranged in the left-right direction. By the rotation of the roller 23, the load 11 is conveyed to the vicinity of the lane passage 31. The delivery conveyor 22 is configured to rotatably support a large number of rollers 24 arranged in the left-right direction, and the rotation of the rollers 24 conveys the load 11 from the crane passage 31 side to the subsequent processing station.

As shown in FIG. 2, the stacker crane 30 has a mast 34 which is erected on a crane body 33, and an elevating table 35 is supported on the mast 34 so as to be vertically movable. The crane body 33 travels on the rail 32 by means of wheels 36.

A roller conveyor 37 is provided on the upper surface of the lift table 35. The roller conveyor 37 is configured by arranging a large number of drive rollers 38 rotatably on a roller frame 38 provided on the elevating table 35 and extending toward the delivery conveyor 22. These drive rollers 38 convey the load 11 placed on the drive rollers 38 toward the delivery conveyor 22.

The roller conveyor 37 is supported by a roller frame 38 which is divided into three parts in the conveying direction, and lifters 40 are mounted on the lift tables 35 on both sides of the central frame 38. The lifter 40 is provided with a pair of slide forks 41, and the pair of forks 41 are extendable / contractible in synchronization with the longitudinal direction of the drive roller 39, that is, the direction perpendicular to the paper surface. Therefore, the load support portion 41a of the fork 41 is projected upward from between the rollers 39 by the action of the lifter 40, and the fork 41 is expanded and contracted to transfer the load.

Next, the operation of this embodiment will be described. When the load 11 is unloaded from the rack 10, the slide fork 41 is in a position raised by the lifter 40. At this time, the elevating table 35 is positioned at the lower level, and in this state, the slide fork 41 projects toward the rack 10. Then, as the lift table 35 rises to the upper level, the slide fork 41 lifts the load 11 in the rack 10. Then, the slide fork 41 is pulled back to the lift table 35 side, and the load 11 is placed on the lift table 35. Next, the crane body 33 travels, and the load 11 is conveyed to the loading / unloading station 20.

At the loading / unloading station 20, the slide fork 41 is lowered by the lifter 40, and the load 11 is transferred onto the roller conveyor 37. Next, the roller conveyor 37 is driven, and the load 11 is transferred to the delivery conveyor 22 by the rotation of the drive roller 39. In parallel with this, the slide fork 41 projects toward the storage conveyor 21 side and is lifted by the lifter 40 to lift the load 11 on the storage conveyor 21. At this time, the upper end portion of the support portion 41a of the slide fork 41 projects above the upper surface of the roller conveyor 37. Then, the slide fork 41 is returned to the ascending / descending table 35, and the lifter 40 is lowered. As a result, the load 11 on the slide fork 41 is lowered onto the lift table 35.

In this way, the unloading work from the delivery conveyor 22 and the loading work from the warehousing conveyor 21 are performed in parallel. Therefore, the cycle time for loading and unloading the load 11 by the stacker crane 30 is significantly reduced. The load 11 loaded on the lift table 35 is stored in a predetermined rack 10 through a process reverse to that of the above-mentioned unloading.

As described above, according to the above-described embodiment, it is possible to perform the unloading work from the lifting platform 35 to the exit conveyor 22 and the loading work from the loading conveyor 21 to the lifting platform 35 in parallel. As a result, the work time can be shortened and the loading / unloading cycle time can be significantly reduced.

In the above embodiment, the transport direction of the drive roller 39 of the roller conveyor 37 is orthogonal to the slide direction of the slide fork 41, and the shipping conveyor 22 is arranged on the extension of the crane passage 31. However, the conveyance direction by the drive roller 39 may be configured to be the same as the slide direction of the slide fork 41, and the delivery conveyor 22 may be arranged at a position facing the entry conveyor 21 with the crane passage 31 interposed therebetween. According to this configuration, in the same way as in the above-described embodiment, the loading / unloading work of the load 11 in the loading / unloading station 20 can be performed in parallel, and the loading / unloading work of the load 11 in each rack 10 can also be performed in parallel. .. That is, the load 11 can be unloaded onto the rack 10 above the crane passage 31 by the roller conveyor 37, and in parallel with this, the load can be loaded onto the rack 10 below the crane passage 31 by the slide fork 41.

[0017]

[Effect of the device]

 As described above, according to the present invention, the unloading work from the lifting platform and the loading work on the lifting platform can be performed in parallel, and the working time can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a plan view showing an automated warehouse to which a stacker crane according to an embodiment of the present invention is applied.

FIG. 2 is a side view showing a stacker crane according to an embodiment of the present invention.

[Explanation of symbols]

 11 cargo 30 stacker crane 35 lifting platform 37 roller conveyor 41 slide fork

Claims (1)

[Scope of utility model registration request] 1. An elevating table, a slide fork provided on the elevating table so as to project in a horizontal direction, and loading and unloading a load on the elevating table, and a load provided on the elevating table in a direction different from a projecting direction of the slide fork. A stacker crane, comprising: a roller conveyor for moving and loading and unloading it on an elevator.