Physical distribution system

Abstract

To provide a physical distribution system capable of coping with an expanding physical quantity, in a conveyor line causing a height difference.SOLUTION: The empty tray 100 taken out from the automatic warehouse is transferred in the order of the inclined conveyor 30a - 3, the inclined conveyor 30a - 1, the upper 40a - 1 of the descending lifter 10, and the inclined conveyor 40. When three empty trays are loaded, the empty trays are sequentially transferred to the lower end 40a (2) of the descending lifter, the inclined conveyor 30b (1), the inclined conveyor 30b (3), and the picking station. The tray 200 in which the goods are completely input in the inclined conveyer 30d-1 is transferred in the order of the inclined conveyer 30b - 4, the inclined conveyer 30b - 2, the lower 40b - 2 of the lifter 20 for elevation, and the inclined conveyer, and when three trays 200 are loaded, they are transferred in the order of the upper 40b - 1 of the lifter for elevation, the inclined conveyer 30a - 2, and the inclined conveyer 30a - 4 and temporarily stored in the automatic warehouse.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a logistics system, for example, and more particularly to a logistics system for a conveyor line in a logistics warehouse where elevation differences occur. [Background technology]

[0002] Traditional distribution centers that sell products in brick-and-mortar stores such as department stores and shopping malls stock mainly best-selling items.In contrast, distribution centers that handle orders from e-commerce sites using the Internet must accommodate a wide range of customer attributes, and respond to detailed requests such as many sizes, color combinations, and genders, which requires them to stock a huge number of product items at once.

[0003] However, in Japan, single-story logistics centers with large land areas are difficult to operate cost-effectively due to the high cost of land. For this reason, many logistics centers secure a large storage capacity for products in the vertical direction, thereby increasing storage efficiency per land area.

[0004] Various innovations have been attempted for layouts that use automated warehouses, which are the core of logistics equipment and can secure a large storage capacity for products in the vertical direction, and conveyors that connect them to other processes such as receiving, sorting, and shipping.

[0005] When connecting the picking station and the automated warehouse entrance / exit in a straight line, if sufficient distance is not maintained between the picking station and the automated warehouse, the inclination of the conveyor transport line will be steep, which could cause the transported items to fall.

[0006] Conveyor transport lines with turnarounds require additional landing areas for the turnarounds, which increases the transport time.

[0007] Therefore, a new logistics system that can handle the ever-increasing volume of goods is needed. [Prior art documents] [Patent documents]

[0008] none Summary of the Invention [Problem to be solved by the invention]

[0009] The present invention is intended to solve the problems that have existed up to now, as described above, and aims to provide a logistics system that enables a reduction in the conveyor installation area and transport time on conveyor lines with elevation differences; more specifically, to provide a logistics system that does not require building expansion work to accommodate the daily increasing volume of goods, and that can contribute to reducing the costs and time associated with expansion work. [Means for solving the problem]

[0010] The inventors came up with the idea of ​​introducing two lifters midway along the conveyor transport line between the loading / unloading entrance of the automated warehouse and the picking station to accommodate differences in elevation on the transport path, thereby reducing the conveyor length that was previously required to absorb differences in elevation, or eliminating the turning section, and using the volume created by this reduction to increase the volume of the automated warehouse, thereby expanding the storage capacity of the automated warehouse in a short period of time without the need for building expansion work.

[0011] Therefore, in order to solve the above problem, a logistics system according to a first aspect of the present invention comprises a warehouse device that stores a plurality of items to be distributed in a predetermined storage form, a transport device that transports the items in a predetermined transport form, a lifting device that raises and lowers the items, and a work station that sorts the items, wherein the lifting device has a loading section for the items, and the transport device is composed of a first conveyor that transports the items between the warehouse's entry / exit entrance and the lifting device, and a second conveyor that transports the items between the lifting device and the work station, wherein the first conveyor transports the items from the warehouse's entry / exit entrance to the lifting device and from the lifting device to the warehouse's entry / exit entrance, and the second conveyor transports the items from the lifting device to the work station and from the work station to the lifting device, thereby absorbing the difference in elevation between the warehouse's entry / exit entrance and the work station.

[0012] As a logistics system according to the second aspect of the present invention, in the first aspect, the lifting device may be installed with two separate functions: moving the items upward and moving the items downward.

[0013] As a logistics system according to a third aspect of the present invention, in the first aspect, the first conveyor and / or the second conveyor may be inclined at a desired angle.

[0014] As a logistics system according to the fourth aspect of the present invention, in the third aspect, the lifting device may be configured to raise and lower the item loading section by tilting it at a desired angle, approximately in line with the inclination of the first conveyor and / or the second conveyor.

[0015] As a logistics system according to the fifth aspect of the present invention, in the third aspect, the lifting device may have a function of approximately aligning the loading section of the item with the inclination of the first conveyor and / or the second conveyor while lifting or lowering.

[0016] As a logistics system according to a sixth aspect of the present invention, in the first aspect, the lifting device may lift and lower three of the items simultaneously.

[0017] As a logistics system according to the seventh aspect of the present invention, in the first aspect, the lifting device may be provided with multiple loading sections for the items, and may receive the items from the first conveyor and transfer the items to the second conveyor, and / or receive the items to the second conveyor and transfer the items to the first conveyor approximately simultaneously.

[0018] As a logistics system according to the eighth aspect of the present invention, in the first aspect, the lifting device may be provided with multiple loading sections for the items, and may continuously receive the items from the first conveyor and transfer them to the second conveyor, and / or receive the items to the second conveyor and transfer them to the first conveyor. [Effects of the Invention]

[0019] According to the present invention, one of the effects of shortening the length of the conveyor is that the conveyor installation area that can be reduced compared to conventional methods can be used to increase the volume of the automated warehouse, making it possible to accommodate an increase in the amount of goods in a short period of time without requiring expansion work on the building itself. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a schematic diagram illustrating a logistics system as an embodiment of the present invention. [Figure 2] FIG. 2 is a schematic diagram illustrating the hardware configuration of an overall control computer according to an embodiment of the present invention. [Figure 3] FIG. 2 is a schematic diagram illustrating the flow of a tray according to an embodiment of the present invention. [Figure 4] FIG. 1 is a schematic diagram illustrating the flow of trays in a conventional conveyor installation example (1). [Figure 5] FIG. 10 is a schematic diagram illustrating the flow of trays in another conventional conveyor installation example (2). DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following are examples of devices and methods for embodying the technical idea of ​​the invention, and the technical idea of ​​the present invention is not limited to the following. The technical idea of ​​the present invention can be variously modified within the scope of the matters described in the claims. In particular, it should be noted that the drawings are schematic and may differ from the actual product. Descriptions of parts that are already known technology have been omitted.

[0022] Fig. 1 is a schematic diagram illustrating a logistics system as an embodiment of the present invention. As shown in Fig. 1, the logistics system 1 is composed of an overall control computer 1000, an automated warehouse 500 as a warehouse device, lifters 10 and 20 as lifting devices, a conveyor 30 as a transport device, a loading unit 40 for loading trays provided for the lifting device, and a display 50 installed at a picking station.

[0023] 2 is a schematic diagram illustrating the hardware configuration of an overall control computer according to one embodiment of the present invention. The overall control computer 1000 includes a CPU (Central Processing Unit) 1010, a ROM (Read-Only Memory) 1020 storing control programs and the like that run on the CPU, a RAM 1030 for temporarily storing various data, a storage device 1040, an input device 1050 such as a keyboard for inputting various data such as order data, product data, work procedures, and planned schedules, an output device 1060 such as a monitor for displaying data, and a wired / wireless communication device 1070 for exchanging various desired control-related data with each logistics device. The overall control computer 1000 may also be a server.

[0024] The overall control computer 1000 reads the ID labels (not shown) attached to the trays and products using sensors (not shown) placed at desired locations, and controls the automated warehouse 500, lifter 10, lifter 20, conveyor 30, loading section 40, and display 50 to display the trays, product in / out, transportation, and work details required for sorting work at the picking station.

[0025] FIG. 3 is a schematic diagram illustrating the flow of trays according to one embodiment of the present invention. The present invention covers the range of section T indicated by the two-dot dashed line. As shown in FIG. 3, empty trays 100 removed from an exit (not shown) of an automated warehouse 500 on a mezzanine installed on the mezzanine floor are transported by conveyor 30a-1 inclined at A degrees via conveyor 30a-3 inclined at B degrees, and then transferred to conveyor (loading section) 40 inclined at A degrees, the same inclination as conveyor 30a-3, at the upper section 40a-1 of lifter 10, a descending elevator waiting at heights H1 / H3 from the building floor. When three empty trays 100 are successively transferred to the loading section 40, the three trays are all vertically conveyed together by the lowering lifter 10 to the lower section 40a-2 at a height H4 / H2 from the building floor by a distance obtained by subtracting H1 from H4 or H3 from H2. The trays are then transferred onto the conveyor 30b-1 inclined at A degrees, and are then conveyed to the picking station in the work area via the conveyor 30b-3 inclined at B degrees, which is inclined more inclined than A degrees, and are then conveyed to the picking station in the work area by the conveyor 30d-1 which is horizontal with the building floor of the picking station and at a height H0 from the building floor. In accordance with the work content displayed on the display 50, the worker P picks the products conveyed from a conveying route (not shown) separate from the flow of the trays 100 and 200 onto the conveyor 30d-1. 00, and once the loading of the products has been completed, the trays 200 containing the divided products are transported by a conveyor 30b-4 inclined at B degrees and a conveyor 30b-2 inclined at A degrees, and are transferred to a conveyor (loading section) 40 inclined at A degrees by the lower section 40b-2 of the lifting elevator lifter 20 which is waiting at a height H2 / H4 from the building floor.When three trays 200 are transferred in succession, they are transported all three together vertically by the lifting lifter 20 to the upper section 40b-1 at a height H3 / H1 from the building floor, transferred to a conveyor 30a-2 inclined at A degrees, and transported to the automated warehouse 500 via a conveyor 30a-4 inclined at B degrees, and are temporarily stored in the automated warehouse 500 through an entrance (not shown) of the automated warehouse 500.

[0026] The height difference between conveyor 30 (not shown) connected to the loading / unloading entrance (not shown) of automated warehouse 500 on the mezzanine floor and conveyor 30d-1, which is at height H0 from the horizontal building floor, is reduced by vertical movement using lifters 10 and 20, and the remaining heights are inclined by conveyors 30a-1, 30a-2, 30b-1, and 30b-2 at A degrees, and by conveyors 30a-3, 30a-4, 30b-3, and 30b-4 at B degrees, thereby shortening the overall length of the conveyors in a transport system with height differences and enabling transport time to be reduced.

[0027] The overall control computer 1000 controls the transport of lifter 10, lifter 20, conveyor 30a-1, conveyor 30a-2, conveyor 30a-3, conveyor 30a-4, conveyor 30b-1, conveyor 30b-2, 30b-3, and 30b-4, and at the picking station, conveyor 30d-1 transports empty tray 100, and a display 50 placed in front of worker P displays the work content for worker P to pick items onto tray 100, causes the items to be transported by a conveyor on a different transport route (not shown), and causes tray 200 with items placed on it to be transported by conveyor 30d-1.

[0028] The conveyor length will be explained when the lifter of the present invention is used, where the inclination of the conveyors 30b-3 and 30b-4, which are inclined by B degrees, is calculated as A degrees.

[0029] The depth of the stacking section 40 is (H1-H3)÷sinA degrees=(H4-H2)÷sinA degrees, and when three trays are loaded, the depth of each tray can be up to (H1-H3)÷sinA degrees÷3=(H4-H2)÷sinA degrees÷3. However, the number of trays that can be loaded is not limited to three.

[0030] The conveyor moves vertically a distance (H1-H4) = (H3-H2) from the receiving opening of the upper section 40-1 of the lifter 10 at height H1 to the position of the lower section 40-2 of the lifter 10 at height H4. If the conveyor 30b-1 is laid at an angle A degrees, the conveyor length from the delivery opening of the lower section 40-2 of the lifter 10 at height H2 to the conveyor 30d-1 installed horizontally in the picking station is (H2-H0) ÷ SinA degrees.

[0031] If conveyor 30b-1 is laid at an angle A degrees from conveyor 30d-1 at height H0 to the receiving port of lower section 40b-2 of lifter 20 at height H2, as described above, the length of conveyor 30b-1 will be (H2-H0) ÷ sinA degrees, and the total length of conveyors 30b-1 (including 30b-3), 30b-2 (including 30b-4), and loading sections 40 of lifter 10 and lifter 20, which are within the range of section T indicated by the dashed two-dot line, will be ((H2-H0) ÷ sinA degrees + (H1-H3) ÷ sinA degrees) × 2.

[0032] Figure 4 is a schematic diagram illustrating the flow of trays in a conventional conveyor installation example (1). Figure 4 shows a case where a conveyor line is connected in a straight line from the height of the exit (not shown) of an automated warehouse 500 on a mezzanine installed on the mezzanine floor to the height of the picking station. However, the conveyor from the exit of the automated warehouse 500 to the point where it starts to tilt obliquely is omitted. When the calculation and conditions for the conveyor length of the present invention described above are combined, this corresponds to section T1 shown in the figure. Tray 100 is transported from height H1, which corresponds to the upper section 40-1 of lifter 10, by conveyor 30b-1 inclined at A degrees to a picking station in the work area via conveyor 30b-3 inclined at B degrees. At conveyor 30d-1, which is level with the building floor of the picking station and at height H0 from the building floor, worker P places products, which are transported from a transport route (not shown) separate from the flow of trays 100 and 200, onto tray 100 according to the work content displayed on display 50. Once the products have been placed into tray 200 containing the subdivided products, the tray 200 is transported to height H1 by conveyor 30b-4 inclined at B degrees and conveyor 30b-2 inclined at A degrees. The conveyor length is calculated as follows: Note that conveyors 30b-3 and 30b-4 inclined at B degrees are calculated as A degrees.

[0033] If the conveyor is laid at an angle A degrees from height H1, which corresponds to the receiving opening of the upper section 40-1 of the lifter 10, to the conveyor 30d-1 at height H0, the conveyor length will be (H1-H0) / sinA degrees. If the conveyor is laid at an angle A degrees from the conveyor 30d-1 at height H0 to height H1, the conveyor length will also be (H1-H0) / sinA degrees, and the total conveyor length for both within the range of section T1 indicated by the two-dot dash line will be (H1-H0) / sinA degrees x 2.

[0034] Figure 5 is a schematic diagram illustrating the tray flow in another conventional conveyor installation example (2). Figure 5 shows a case where a conveyor line is connected by turning back midway from the height of the exit (not shown) of an automated warehouse 500 on a mezzanine installed on the mezzanine floor to the height of a picking station. However, the conveyor from the exit of the automated warehouse 500 to the point where it starts to tilt obliquely is omitted. When the calculation and conditions for the conveyor length of the present invention described above are combined, this corresponds to section T2 shown in the figure. The conveyor length is calculated when conveyor 30a-1 is laid at an angle of A degrees from height H1 corresponding to the upper section 40-1 of lifter 10, turns back at height H5 which is half the difference with height H0 of conveyor 30d-1 of the picking station, conveyor 30b-1 is laid at angle A degrees up to conveyor 30d-1 at height H0, laid at angle A degrees up to height H5 which is half the difference between height H0 and height H1 of conveyor 30d-1, turns back, and lays 40b-1 at angle A degrees up to height H1 corresponding to the height.

[0035] If the height H5, which corresponds to half the difference between the height H1 corresponding to the receiving port of the upper section 40-1 of the lifter 10 and the height H0 of the conveyor 30d-1 of the picking station, is laid at an inclination of A degrees, the conveyor length of 30a-1 will be (H1-H5)÷SinA degrees.

[0036] The conveyor length of conveyor 30b-1, which is laid at an inclination of A degrees from the landing of the turnaround to conveyor 30d-1, is (H5 - H0) ÷ SinA degrees, as in the above calculation. In addition, the turnaround section is added, and a length L6 (not shown) is required for the tray rotation.

[0037] The same calculation is applied when the conveyor is laid from conveyor 30d-1 to the height corresponding to the delivery opening of the upper section 40b-1 of lifter 20 in a turnaround manner. The total conveyor length of conventional conveyor laying example (2) within the range of section T2 indicated by the two-dot dashed line is the conveyor length of the turnaround landing part, which is ((H1-H5) ÷ sinA degree + L6) + (H5-H0) ÷ sinA degree + L6 = (H1-H0) ÷ sinA degree + 2 × L6. In other words, compared to conventional conveyor laying example (1), a conveyor length of 2 × L6 is required.

[0038] Comparing the conveyor length of the conventional conveyor installation example (1) with the conveyor length of one embodiment of the present invention, including the lifters, and the total conveyor length required to accommodate the height of the automated warehouse entrance and exit per picking station, gives (H1-H0) / SinA degrees x 2-((H2-H0)+(H1-H3))÷SinA degrees x 2=(H3-H2) / SinA degrees x 2. In other words, it is possible to shorten the conveyor length corresponding to the vertical travel distance of two lifters 10 and lifter 20 divided by SinA degrees.

[0039] The conveyor length for conventional conveyor installation example (2) is 2 x L6 longer than the conveyor length for conventional conveyor installation example (1), so for one embodiment of the present invention, a length equivalent to (H3 - H2) / SinA degree x 2 + 2 x L6 is required.

[0040] Next, the area occupied by the building when the conventional conveyor installation example (1) is installed and the conveyor installation according to the present invention is compared.

[0041] The width of tray 100 and tray 200 is W, and the conveyor width is W for calculation.

[0042] The area occupied by the conveyor of the present invention in a building can be calculated by adding the projected area of ​​the conveyor tilted at an angle A as viewed from above and the projected area of ​​the loading section 40 of the lift 10 and lifter 20 as viewed from above. The calculation is performed under the same conditions as for the conveyor length.

[0043] As mentioned above, the sum of the conveyor length, lifter 10, and the length of the loading section 40 of lifter 20 is ((H2-H0) ÷ sinA degrees + (H1-H3) ÷ sinA degrees) × 2, so the area occupied by the building by installing the conveyor of the present invention is ((H2-H0) ÷ sinA degrees + (H1-H3) ÷ sinA degrees) × cosA degrees × 2 × W.

[0044] In the conventional conveyor installation example (1), the area occupied by the conveyor in the building is calculated by projecting the area of ​​the conveyor when viewed from above at an angle of A degrees, using the same conditions as for calculating the conveyor length: (H1-H0) / SinA degrees x CosA degrees x 2 x W.

[0045] The calculation of the area occupied by the conveyor in the building in the conventional conveyor installation example (2) is omitted. The explanation is omitted because an additional landing area is required in addition to the area occupied by the conveyor in the building in the conventional conveyor installation example (1).

[0046] The area occupied by the conveyor of the present invention in a building can be reduced by (H3-H2) / SinA degree x CosA degree x 2 x W compared to the area occupied by the conveyor in the building in the conventional conveyor installation example (1).

[0047] Assuming that there are 10 picking stations installed in a building using the conventional conveyor installation example (1), changing to the conveyor installation of the present invention will create an area margin of 10 x (H3 - H2) / SinA degrees x CosA degrees x 2 x W.

[0048] For example, if W is 500 mm, height H2 is 1200 mm, height H3 is 3200 mm, tilt angle A is 15 degrees, and 10 picking stations are installed, the approximately 37 square meters that can be saved can be diverted to expand the capacity of the automated warehouse, making it possible to increase the storage volume of the automated warehouse and add more picking stations.This saved area can be used to expand the automated warehouse when an increase in volume is required, eliminating the need for building expansion work and contributing to reducing the cost and time associated with expansion work.

[0049] By adding lifters 10 and 20 to the tray flow, the difference in height can be absorbed by vertical movement, making it possible to shorten the total distance required for the logistics flow. By lifting and lowering three trays at a time, the transport time can be further shortened.

[0050] As described above, the lifters 10 and 20 vertically move the conveyor loaded with three trays 100 and 200 at the same time, but this is not limited to three trays, and the lifters 10 and 20 are not limited to the elevator-type vertical movement described above, but may also continuously raise and lower the trays using an escalator type (vertical conveyor) or a multi-story parking lot type (a two-row structure in which the rows used are changed for the top and bottom).

[0051] The loading section 40 of the lifter 10 is not limited to a conveyor, and may be any mechanism capable of receiving three trays 100 from conveyor 30a-1 onto the lifter 10 and transferring three trays 200 from conveyor 30b-2 onto the loading section 40 of the lifter 20. The loading section 40 may be lowered while tilted by A degrees, or, for example, the lifter 10 may employ a structure (not shown) for rotating / sliding the loading section 40 vertically, so that at position 40a-1, the depth side of the loading section 40 is tilted / rotated vertically downward by A degrees from a horizontal state, and after completing the transfer of the three trays 100 to the lifter 10, the lifter 10 may be lowered in a horizontal state, and then tilted / rotated by A degrees at position 40a-2 to transfer the trays 100 to 30b-1. In this case, the loading section 40 may be lowered by returning it to a horizontal state, or it may be lowered without being returned to a horizontal state. Alternatively, to further reduce the transport time, the lifter 20 may be tilted at an angle A from the horizontal during lifting. The mechanism of the loading section 40 of the lifter 20 is not limited to a conveyor, and may be the same as that of the lifter 10.

[0052] Furthermore, the number of lifters 10 and 20 is not limited to one each, but multiple lifters may be provided, and by continuously raising and lowering the trays, the waiting time of the loading section 40 can be shortened to the desired time.

[0053] There are other benefits to introducing lifters, as listed below. 1) The conveyor length has been significantly reduced, which has resulted in an improvement in the working environment due to the reduction in noise generated by the conveyor operation. 2) The length of 180-degree turn curve conveyors and inclined conveyors can be reduced, which contributes to lower maintenance costs. [Industrial Applicability]

[0054] As configured as described above, empty trays 100 that are removed from the exit of the automated warehouse 500 on the mezzanine installed on the mezzanine floor are transported by conveyor 30a-1 inclined at A degrees via conveyor 30a-3 inclined at B degrees, and then transferred to conveyor 40 inclined at A degrees by the upper section 40a-1 of the lifter 10 of the descending elevator waiting at heights H1 / H3 from the building floor. When three empty trays 100 are successively transferred onto the loading section 40, the three trays are vertically transported together by the vertically descending lifter 10 to the lower section 40a-2 at a height H4 / H2 from the building floor, transferred onto the conveyor 30b-1 inclined at A degrees, and transported to the picking station in the work area via the conveyor 30b-3 inclined at B degrees. At the picking station, the conveyor 30d-1 is horizontal with the building floor and at a height H0 from the building floor, and the worker P places products, which are transported from a transport route separate from the flow of the trays 100 and 200, into the tray 100 according to the work content displayed on the display 50, and the product placement is completed. The trays 200 containing the subdivided products are transported by a conveyor 30b-4 inclined at B degrees and a conveyor 30b-2 inclined at A degrees, and are transferred to the conveyor 40 inclined at A degrees by the lower section 40b-2 of the lifter 20 of the lifting elevator waiting at a height H2 / H4 from the building floor. When three trays 200 have been transferred in succession, they are transported all three together vertically by the lifter 20 to the upper section 40b-1 at a height H3 / H1 from the building floor, transferred to the conveyor 30a-2 inclined at A degrees, and transported to the automated warehouse 500 via the conveyor 30a-4 inclined at B degrees, and temporarily stored in the automated warehouse 500 through the entrance of the automated warehouse 500.

[0055] Therefore, the transport system of the present invention has great applicability in the logistics industry as well as in various manufacturing industries. [Explanation of symbols]

[0056] 1. Logistics System 10... (for lowering) lifter, (for lowering) lifting device 20... (for lifting) lifter, (for lifting) lifting device 30, 30a‐1, 30a‐2, 30a‐3, 30a‐4, 30b‐1, 30b‐2, 30b‐3, 30b‐4, 30d‐1···Conveyor, conveying device 40....(lifting device) loading section 40a‐1, 40b‐1...Upper section 40a‐2, 40b‐2...lower section 50...Display unit 100 empty trays 200...Trays filled with small items 500···Automated warehouse, warehouse equipment 1000... Overall control computer 1010 CPU 1020...ROM 1030 RAM 1040...Storage device 1050... Input device 1060... output device 1060...Communication equipment

Claims

1. a warehouse device that stores a plurality of items to be distributed in a predetermined storage form; a conveying device that conveys the items in a predetermined conveying form; a lifting device for lifting and lowering the item; a work station for sorting said items; Equipped with the lifting device has a loading section for the item, The transport device includes a first conveyor that transports the items between an entrance / exit of the warehouse and the elevator device; a second conveyor for transporting the items between the elevator and the work station; A logistics system characterized in that the first conveyor transports the items from the entrance / exit gate of the warehouse to the lifting device and from the lifting device to the entrance / exit gate of the warehouse, and the second conveyor transports the items from the lifting device to the work station and from the work station to the lifting device, thereby absorbing the difference in height between the entrance / exit gate of the warehouse and the work station.

2. 2. The logistics system according to claim 1, wherein the lifting device is installed separately for two functions: to move the items upward and to move the items downward.

3. 2. The logistics system according to claim 1, wherein the first conveyor and / or the second conveyor are inclined at a desired angle.

4. The logistics system according to claim 3, characterized in that the lifting device lifts and lowers the item loading section at a desired angle that is approximately in line with the inclination of the first conveyor and / or the second conveyor.

5. 4. The logistics system according to claim 3, wherein the lifting device has a function of substantially aligning the loading section of the item with the inclination of the first conveyor and / or the second conveyor while lifting or lowering the loading section.

6. 2. The logistics system according to claim 1, wherein the lifting device lifts and lowers three of the items simultaneously.

7. The logistics system described in claim 1, wherein the lifting device has multiple loading sections for the items and is configured to receive the items from the first conveyor and deliver them to the second conveyor, and / or receive the items to the second conveyor and deliver them to the first conveyor approximately simultaneously.

8. The logistics system described in claim 1, wherein the lifting device has multiple loading sections for the items and continuously receives the items from the first conveyor and transfers them to the second conveyor, and / or receives the items to the second conveyor and transfers them to the first conveyor.

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