AUTOMATED GRID STORAGE AND RETRIEVAL SYSTEM WITH FOAM-BASED FIRE PREVENTION SYSTEM

Abstract

An autonomous grid storage system (1) with a foam based fire prevention system. The autonomous grid storage system is in the form of a grid storage structure (104) dived into sub grids (10A, 10B, 10C) separated by firebreak or firebreaks (12). A foam dispensing system (20) dispenses a fire-retardant foam into the firebreak or firebreaks in the event of fire.

Claims

1. An automated grid storage and retrieval system comprising: a storage grid structure comprising a rail system comprising a first set of parallel rails (110) arranged in a horizontal plane (P) and extending in a first direction (X), and a second set of parallel rails arranged in the horizontal plane (P) and extending in a second direction (Y) which is orthogonal to the first direction (X), which first and second sets of rails form a grid pattern in the horizontal plane (P) comprising a plurality of adjacent grid cells, each grid cell comprising a grid opening defined by a pair of neighboring rails of the first set of rails and a pair of neighboring rails of the second set of rails; and a plurality of storage columns arranged into a storage grid, each column being arranged to store a respective stack of storage bins wherein the storage columns are located beneath the rail system, wherein each storage column is located vertically below a respective grid opening; the system further comprising: a plurality of bin handling vehicles that operate on the rail system for collecting and returning storage bins to and from storage columns, and a control system for monitoring and controlling the automated grid storage and retrieval system; wherein the storage grid structure comprises a plurality of sub grids and a firebreak or firebreaks, wherein adjacent sub grids are separated by the firebreak or firebreaks, and wherein a foam dispensing system is arranged in connection with the firebreak for dispensing a fire-retardant foam into the firebreak in the event of a fire.

2. The automated grid storage and retrieval system according to claim 1, wherein adjacent sub grids are co-joined by one or more bridges in the form of sections of rail upon which the bin handling vehicles may pass over the firebreak.

3. The automated grid storage and retrieval system according to claim 1, wherein the firebreak or firebreaks comprises a row of storage columns of the installed storage grid structure, said storage columns being devoid of storage containers.

4. The automated grid storage and retrieval system according to claim 1, wherein the foam dispensing system is arranged to dispense a sufficient amount of foam to fill the entire volume of the space in the firebreak or firebreaks.

5. The automated grid storage and retrieval system according to claim 1, wherein the sub grids have a grid face adjacent to the firebreak or firebreaks, said grid face being lined with a fire barrier material and arranged to prevent foam from flowing into grid columns containing containers.

6. The automated grid storage and retrieval system according to claim 5, wherein the barrier is made of a fire-code approved fire barrier material.

7. The automated grid storage and retrieval system according to claim 1, further comprising an upper overflow drain at an upper level of the firebreak or firebreaks arranged to drain away excess foam material in order to prevent foam material from flowing into areas of grid outside the aisle or aisles.

8. The automated grid storage and retrieval system according to claim 1, further comprising a lower drain located at a lower level of the firebreak or firebreaks for draining away foam material.

9. The automated grid storage and retrieval system according to claim 1, further comprising a one or more mesh grates connected between adjacent sub grids, the mesh grates adapted as a service platform.

10. Method for preventing spread of fire in an automated grid storage and retrieval system according to claim 1, wherein the method comprises: dispensing a fire retardant foam into the aisle or aisles to isolate one or more of the plurality of sub grids in which a fire has started, and extinguishing or reducing the fire on the one or more sub grids by use of a fire extinguishing apparatus.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The following drawings are appended to facilitate the understanding of the invention. The drawings show embodiments of the invention, which will now be described by way of example only, where:

[0050] FIG. 1 is a perspective view of a prior art automated grid storage and retrieval system;

[0051] FIG. 2 is a perspective view of a prior art bin handling vehicle having a centrally arranged cavity for containing storage bins therein;

[0052] FIG. 3 is a perspective view of a prior art bin handling vehicle having a cantilever for containing storage bins underneath;

[0053] FIG. 4 is a top view of a prior art single rail grid;

[0054] FIG. 5 is a top view of a prior art double rail grid;

[0055] FIG. 6 is a top view of grid column

[0056] FIG. 7 is a top view of one possible arrangement of sub grids

[0057] FIG. 8 is a side elevational view of one possible arrangement of sub grids.

DETAILED DESCRIPTION OF THE INVENTION

[0058] FIGS. 1-6 collectively illustrate an autonomous grid storage system 1 as known in the prior art, such as, for example, the Autostore® system of the present applicant. As shown in FIG. 1, a salient feature of such a system is the dense, efficient utilization of as much of a usable space in a warehouse area as possible.

[0059] According to the present invention, fire safety is improved by dividing the storage grid structure 104 into a plurality of sub grids separated by firebreaks, with apparatus arranged for dispensing a fire retardant foam into the firebreaks in the event of fire.

[0060] FIGS. 7 and 8 shows a storage grid structure 104 dived into three sub grids 10A, 10B and 10C. While FIGS. 7 and 8 illustrates three sub grids, it should be understood that the storage grid structure can be divided into any number, size or configuration of sub grids, depending on the size of grid storage system, fire safety regulations mandating grid size, or other considerations.

[0061] In one embodiment of the invention, illustrated in FIGS. 7 and 8, the sub grids 10A, 10B and 10C are separated by firebreaks 12. The embodiment illustrated in the figures shows the firebreaks 12 being parallel and crossing the entire width of the grid structure. It should be understood however that firebreaks 12 may also run perpendicular to each other such that the firebreaks intersect, thereby dividing the grid structure into a plurality of sub grids, some of which being in the interior of the grid structure.

[0062] Each firebreak 12 is preferably formed by converting an entire row of storage columns of an installed grid structure to the purpose of forming the firebreak, with the storage columns being devoid of storage containers. This permits the storage system to be installed in the normal manner, with the location and arrangement of the firebreaks determined according to need. This further permits the number of, and arrangement of, the firebreaks to be modified in the future, simply by removing storage containers from different rows as need arises. This has the further advantage of avoiding complicated software adjustments in the control software for the automated storage system, as the grid pattern of the storage system remains intact.

[0063] Alternatively, however, the firebreaks 12 may be arranged as a gap between independently assembled sub grids installed in proximity to one another so as to form an firebreak between adjacent sub grids.

[0064] As shown in FIG. 8, the sub grids have a vertical grid face 14 adjacent to firebreaks 12. Grid face 14 is lined with a fire barrier material 16. In addition to being a fire barrier, the material lining the grid face prevents foam from flowing into the interior of the sub grids and damaging articles in the containers. Fire barrier material 16 is preferably a material known in the art as a suitable fire barrier material, for example steel or other non-combustible material, in compliance with applicable national and international fire prevention standards, such as for example NFPA and/or ICC IBC.

[0065] One or more bridges 18 are arranged between sub grids to permit bin handling vehicles to travel between sub grids over firebreaks 12. FIG. 7 illustrates one bridge 18 crossing between adjacent sub grids, but it should be understood that any number of bridges is possible within the scope of the invention. In one embodiment, every grid space of each firebreak has a bridge 18, thereby permitting the control software to operate as if the storage system comprised a single large grid.

[0066] One or more steel mesh grates 19 may be arranged between sub grids at a convenient height to provide a working platform for staff or firefighters. The mesh is arranged to allow the foam to flow down into the firebreak space below the grate.

[0067] As illustrated in FIG. 8, the autonomous grid storage system 1 of the present invention further comprises a foam dispensing system 20 arranged to discharge a fire-retardant foam into firebreaks 12 in the event of a fire. Foam dispensing systems are known in the art, and comprise components and parameter known to those skilled in the art of fire prevention. Such components may include, as conceptually illustrated, a plurality of nozzles 22, supply piping 24 and a supply/reservoir 26 for foam. According to one embodiment, nozzles 22 are medium-expansion foam nozzles arranged to dispense from 100 to 6000 litres per minute of foam, depending upon the volume of the space in firebreak 12 to be filled.

[0068] One or more drains are arranged in connection with firebreaks 12. FIG. 8 illustrates an embodiment where an upper drain 28 is arranged at or near the top level of firebreak 12, in order to prevent excess foam from flowing over the top of the firebreak and into the interior of adjacent sub grids. A lower drain 30 at or near the base of firebreaks 12 is arranged to drain away the foam after the danger of fire has subsided. The foam may for example be flushed into lower drain 30 by water from hoses or a dedicated sprinkler system (not illustrated).

[0069] In the event of fire, an alarm will activate the foam dispensing system, preferably only in the area in which fire is detected. The foam dispensing system will completely fill firebreak 12 with fire retardant foam, thus mitigating the spread of fire. When the danger of fire has subsided, the foam may be flushed with water through the lower drains 30.

REFERENCE NUMERALS

[0070] 1 Storage and retrieval system (prior art) [0071] 100 Framework structure [0072] 102 Upright members/vertical members of framework structure [0073] 103 Horizontal members of framework structure [0074] 104 Storage grid structure [0075] 105 Storage column [0076] 106 Storage bin [0077] 106′ Particular position of storage bin [0078] 107 Stack [0079] 108 Rail system/track system [0080] 110 Parallel rails in first direction (X) [0081] 110a First rail of neighboring rails 110 [0082] 110b Second rail of neighboring rails 110 [0083] 111 Parallel rails in second direction (Y) [0084] 111a First rail of neighboring rails 111 [0085] 111b Second rail of neighboring rails 111 [0086] 112 Grid column [0087] 115 Grid opening [0088] 119 First port column/first port [0089] 120 Second port column/second port [0090] 122 Grid cell/storage cell [0091] 201 Prior art single cell bin handling vehicle [0092] 201a Vehicle body of the bin handling vehicle 201 [0093] 201b Drive means/wheel arrangement, first direction (X) [0094] 201c Drive means/wheel arrangement, second direction (Y) [0095] 301 Prior art cantilever bin handling vehicle [0096] 301a Vehicle body of the bin handling vehicle 301 [0097] 301b Drive means in first direction (X) [0098] 301c Drive means in second direction (Y) [0099] 303 Gripping/engaging device [0100] 10A/10B/10C Sub grids [0101] 12 Firebreak [0102] 14 Grid face [0103] 16 Fire barrier material [0104] 18 Bridge [0105] 19 Mesh grates [0106] 20 Foam dispensing system [0107] 22 Nozzle [0108] 24 Piping [0109] 26 Foam supply/reservoir [0110] 28 Upper drain [0111] 30 Lower drain