Warehouse management system and method that uses light sources to indicate the location of materials.

Abstract

A warehouse management system that uses a light source to indicate the location of materials for storage and retrieval includes a cabinet, a storage rack, a light source, a first electrical connection, a second electrical connection, and a control unit. The cabinet includes a storage rack placement area, a material storage and retrieval area, and a moving device. When the control unit drives the moving device to move the storage rack from the storage rack placement area to the material storage and retrieval area, the first electrical connection contacts the second electrical connection, causing the light source, the first electrical connection, the second electrical connection, and the control unit to conduct electricity. The control unit then activates at least one of the light sources to indicate the location of at least one of the material placement areas. Therefore, this invention can use a light source to indicate the location of a material storage and retrieval area where materials are placed or to indicate the location of a material placement area where materials are intended to be stored, improving the accuracy of material retrieval or storage.

Description

[Technical Field]

[0001] This invention relates to a warehouse management system and method, and more particularly to a warehouse management system and method that uses a light source to indicate the location of material storage and retrieval. [Previous Technology]

[0002] Warehouse management is crucial for many industries. Especially for companies with a wide variety of materials and large storage volumes, properly categorizing materials and placing them in appropriate locations can maximize the efficiency of warehouse space and reduce retrieval time.

[0003] Conventional warehouse management systems typically categorize materials, place them on specific storage racks, and then record relevant information such as material inflows and outflows, material types, and material numbers on paper material lists. When users need to access materials, they can obtain the container and material numbers from the paper material list to find the corresponding storage rack and store or retrieve the materials from the rack.

[0004] However, manual operation is prone to storing materials in the wrong location or taking materials out of the wrong location, resulting in low accuracy. [Summary of the Invention]

[0005] The main objective of this invention is to provide a warehouse management system and method that uses a light source to indicate the location of material storage and retrieval, which can use a light source to indicate the location of the material storage and retrieval area where materials are placed or the location of the material placement area where materials are to be stored.

[0006] To achieve the aforementioned objective, the present invention provides a warehouse management system that uses light sources to indicate the location of materials for storage and retrieval, comprising a cabinet, a storage rack, a plurality of light sources, a first electrical connection, a second electrical connection, and a control unit. The cabinet includes a storage rack placement area, a material storage and retrieval area, and a moving device. The storage rack is disposed in the storage rack placement area and includes a plurality of material storage areas. The light sources are disposed on the storage rack and correspond to the respective material storage areas. The first electrical connection is disposed on the storage rack. The second electrical connection is disposed in the material storage and retrieval area. The control unit is electrically connected to the moving device, the light sources, the first electrical connection, and the second electrical connection. When the control unit drives the moving device to move the storage rack from the storage rack placement area to the material storage and retrieval area, the first electrical connection part contacts the second electrical connection part, so that the light source, the first electrical connection part, the second electrical connection part and the control unit are connected, and the control unit activates at least one of the light source to indicate the position of at least one of the material placement areas.

[0007] In some embodiments, the first electrical connection includes a first base and at least one first conductor. The first base is disposed on one side of the storage rack placement area, and the at least one first conductor is disposed on the first base and electrically connected to the control unit. The second electrical connection includes a second base, at least one second conductor, and at least one retainer. The second base is disposed in the material storage area, and the at least one second conductor is disposed on the second base and electrically connected to the control unit. The two ends of the at least one retainer abut against the second base and the at least one second conductor, respectively. When the storage rack moves from the storage rack placement area to the material storage area, the at least one retainer provides a pushing force to the at least one second conductor, so that the at least one first conductor remains in contact with the at least one second conductor.

[0008] In some embodiments, the first base has at least one groove, and the at least one first conductor is block-shaped and embedded in the at least one groove.

[0009] In some embodiments, the second base has at least one groove, the at least one second conductor is block-shaped and disposed in the at least one groove, and the at least one retainer is disposed in the at least one groove.

[0010] In some embodiments, the two sidewalls of the at least one groove and a bottom wall together form at least one first receiving groove, the at least one second conductor has at least one second receiving groove, and the at least one retainer is located in the at least one receiving groove and the at least one second receiving groove.

[0011] In some embodiments, the two sidewalls of the at least one groove and a bottom wall together form a plurality of first accommodating grooves, the at least one second conductor has a plurality of second accommodating grooves, and the second electrical connection portion includes a plurality of retaining members, which are respectively located in the first accommodating grooves and the second accommodating grooves.

[0012] In some embodiments, the at least one second receiving groove extends through both sides of the at least one second conductor, the diameter of the at least one first receiving groove is greater than the height of the at least one second receiving groove, and the width of the at least one retainer is less than the diameter of the at least one first receiving groove and greater than the height of the at least one second receiving groove, such that both sides of the at least one retainer extend through both sides of the at least one second receiving groove.

[0013] In some embodiments, the second base has at least one socket and at least one sleeve, the at least one sleeve is disposed in the at least one socket and protrudes from the at least one socket, the at least one retainer is disposed in the at least one sleeve, the at least one second conductor is rod-shaped, disposed in the at least one sleeve, protrudes from one end of the at least one sleeve, and is electrically connected to the control unit through the at least one sleeve.

[0014] In some embodiments, the cabinet is a vertical cabinet or a rotating cabinet.

[0015] In order to achieve the aforementioned objective, the present invention provides a warehouse management method for indicating the location of material storage and retrieval using light sources, comprising the following steps: a control unit drives a moving device of a cabinet to move a storage rack from a storage rack placement area of ​​the cabinet to a material storage and retrieval area of ​​the cabinet, and a first electrical connection contacts a second electrical connection, such that a plurality of light sources, the first electrical connection, the second electrical connection and the control unit are connected; and the control unit activates at least one of the light sources to indicate the location of at least one of the plurality of material placement areas of the storage rack.

[0016] The advantage of the present invention is that it can use a light source to indicate the position of the material storage and retrieval area where the material is placed or to indicate the position of the material placement area where the material is to be stored, thereby improving the accuracy of material retrieval or storage.

Implementation Method

[0018] The embodiments of the present invention will be described in more detail below with reference to the drawings and component symbols, so that those skilled in the art can implement them after reading this specification.

[0019] FIG1 is a perspective view of a first embodiment of the warehouse management system of the present invention. FIG2 is a schematic diagram of the electrical connection relationship of each component in the first embodiment of the warehouse management system of the present invention. FIG3 is a perspective view of the first electrical connection part 40 of the present invention. FIG4 is an exploded view of the first electrical connection part 40 of the present invention. FIG5 is a perspective view of the second electrical connection part 50 of the present invention. FIG6 is an exploded view of the second electrical connection part 50 of the present invention. As shown in FIG1 to FIG6, the present invention provides a warehouse management system that uses light sources to indicate the location of material storage and retrieval, including a cabinet 10, a plurality of storage racks 20, a plurality of light sources 30, a plurality of first electrical connections 40, a second electrical connection part 50, and a control unit 60. The cabinet 10 includes a plurality of storage rack placement areas 11, a material storage and retrieval area 12, and a moving device 13. The storage racks 20 are respectively disposed in the storage rack placement areas 11, and each storage rack 20 includes a plurality of material placement areas 21. The light sources 30 are respectively disposed on the storage racks 20 and correspond to the material placement areas 21 of each storage rack 20. The first electrical connection parts 40 are respectively disposed on the storage racks 20. The second electrical connection parts 50 are disposed in the material storage and retrieval area 12. The control unit 60 is electrically connected to the moving device 13, the light sources 30, the first electrical connection parts 40 and the second electrical connection parts 50.

[0020] Figure 7 is a flowchart of material retrieval according to a first embodiment of the warehouse management method of the present invention. Figure 8 is a schematic diagram of step S100 of the first embodiment of the warehouse management method of the present invention. Figure 9 is a schematic diagram of step S110 of the first embodiment of the warehouse management method of the present invention. Figure 10 is a cross-sectional view of the first electrical connection part 40 contacting the second electrical connection part 50 of the present invention. Figure 11 is a schematic diagram of step S120 of the first embodiment of the warehouse management method of the present invention. Figure 12 is a schematic diagram of step S130 of the first embodiment of the warehouse management method of the present invention. The present invention provides a warehouse management method for indicating the location of material storage and retrieval using a light source, comprising the following steps:

[0021] Step S100, as shown in Figures 2, 7 and 8, a scanning device 70 scans a two-dimensional barcode 81 on a discharge slip 80 and generates discharge position information; and a control unit 60 receives the discharge position information and obtains the position of one of the storage racks 20 according to the discharge position information.

[0022] In step S110, as shown in Figures 2, 7, 9 and 10, the control unit 60 drives the moving device 13 to move one of the storage racks 20 from one of the storage rack placement areas 11 to the material storage and retrieval area 12, and one of the first electrical connection parts 40 contacts the second electrical connection part 50, so that the plurality of light sources 30, one of the first electrical connection parts 40, the second electrical connection part 50 and the control unit 60 are connected.

[0023] In step S120, as shown in Figures 2, 7 and 11, the control unit 60 activates several light sources 30 to indicate the position of several material placement areas 21 of one of the storage racks 20.

[0024] Step S130, as shown in Figures 2, 7, and 12, involves manually removing several materials 90 from the indicated material placement areas 21; a sensor 100 in the indicated material placement area 21 senses that a material 90 has been removed and generates discharge information; the control unit 60 receives the discharge information and determines whether the user has removed the material 90 from the correct material placement area 21 based on the discharge location information and the discharge information; when the control unit 60 determines that the user has removed the material 90 from the correct material placement area 21, the control unit 60 controls the light source 30 of the corresponding correct material placement area 21 to turn off; and when the control unit 60 determines that the user has removed the material 90 from the wrong material placement area 21, the control unit 60 controls the light source 30 of the corresponding wrong material placement area 21 to turn off, and at the same time, the control unit 60 controls an alarm unit 110 to issue an alarm signal to remind the user to remove the material 90 from the wrong material placement area 21. The user can immediately place the material 90 back into the wrong material placement area 21 and then remove the material 90 from the correct material placement area 21.

[0025] Accordingly, the present invention can use the light source 30 to indicate the position of the material placement area 21 where the material 90 is placed, thereby improving the accuracy of material 90 removal.

[0026] In some embodiments, step S100 does not require scanning the two-dimensional barcode 81 of the discharge sheet 80 using the scanning device 70. Instead, the discharge position is selected directly by an electronic device 120 (such as a smartphone, tablet, laptop, personal digital assistant or server), and the selected discharge position information is transmitted to the control unit 60, thus omitting the scanning action, which is more convenient.

[0027] Figure 13 is a flowchart of the material feeding process in the first embodiment of the warehousing management method of the present invention. Figure 14 is a schematic diagram of step S200 in the first embodiment of the warehousing management method of the present invention. Figure 15 is a schematic diagram of step S210 in the first embodiment of the warehousing management method of the present invention. Figure 16 is a schematic diagram of step S220 in the first embodiment of the warehousing management method of the present invention. Figure 17 is a schematic diagram of step S230 in the first embodiment of the warehousing management method of the present invention. Figure 18 is a schematic diagram of step S240 in the first embodiment of the warehousing management method of the present invention. The present invention provides a warehousing management method that uses a light source to indicate the location of material storage and retrieval, comprising the following steps:

[0028] Step S200, as shown in Figures 2, 13 and 14, selects a feeding position information from the interface displayed by an electronic device 120 (e.g., smartphone, tablet, laptop, personal digital assistant or server); and the control unit 60 receives the feeding position information and obtains the position of the storage rack 20 with the most empty storage space based on the feeding position information.

[0029] In step S210, as shown in Figures 2, 13 and 15, the control unit 60 drives the moving device 13 to move the storage rack 20 with the most empty storage space from one of the storage rack placement areas 11 to the material storage and retrieval area 12, and one of the first electrical connection parts 40 contacts the second electrical connection part 50, so that the plurality of light sources 30, one of the first electrical connection parts 40, the second electrical connection part 50 and the control unit 60 are connected.

[0030] In step S220, as shown in Figures 2, 13 and 16, the control unit 60 activates several light sources 30 to indicate the positions of several material placement areas 21 of the storage rack 20 with the most empty storage spaces.

[0031] Step S230, as shown in Figures 2, 13 and 17, the scanning device 70 scans the two-dimensional barcode 91 on the material 90 to obtain the number of the material 90; and the control unit 60 receives the number of the material 90.

[0032] Step S240, as shown in Figures 2, 13, and 18, involves manually placing several materials 90 into several designated material placement areas 21. A sensor 100 in each designated material placement area 21 senses the material 90 and generates an input information. The control unit 60 receives the input information and determines whether the user has placed the material 90 into the correct material placement area 21 based on the material 90's number and the input information. When the control unit 60 determines that the user has placed the material 90 into the correct material placement area 21, the control unit 60 controls the light source 30 of the corresponding correct material placement area 21 to turn off. Conversely, when the control unit 60 determines that the user has placed the material 90 into the wrong material placement area 21, the control unit 60 controls the light source 30 of the corresponding incorrect material placement area 21 to turn off, and simultaneously controls the warning unit 110 to issue a warning signal to remind the user to place the material 90 into the incorrect material placement area 21. The user can immediately remove the material 90 from the incorrect material placement area 21 and then place it into the correct material placement area 21.

[0033] Accordingly, the present invention can use the light source 30 to indicate the position of the material placement area 21 where the material 90 is to be stored, thereby improving the accuracy of the storage of the material 90.

[0034] In the first embodiment, as shown in FIG1, the cabinet 10 is a vertical cabinet.

[0035] In the first embodiment, as shown in Figures 1 to 4, each first electrical connection portion 40 includes a first base 41 and a plurality of first conductors 42. The first base 41 is disposed on one side of each storage rack placement area 11, and the first conductors 42 are disposed on the first base 41 and electrically connected to the control unit 60. In the first embodiment, as shown in Figures 1, 2, 5 and 6, the second electrical connection portion 50 includes a second base 51, a plurality of second conductors 52 and a plurality of retaining members 53. The second base 51 is disposed in the material storage and retrieval area 12, and the second conductors 52 are respectively disposed on the second base 51 and electrically connected to the control unit 60. The two ends of each retaining member 53 abut against the second base 51 and each second conductor 52, respectively. As shown in Figures 9 and 10, when the storage rack 20 moves from the storage rack placement area 11 to the material storage and retrieval area 12, the retaining members 53 provide a pushing force to the second conductors 52, so that the first conductors 42 remain in contact with the second conductors 52.

[0036] Accordingly, during the manual storage and retrieval of material 90, the thrust of the retaining members 53 allows the first conductors 42 to remain in contact with the second conductors 52, ensuring that the plurality of light sources 30, one of the first electrical connections 40, the second electrical connection 50, and the control unit 60 remain connected without signal interruption. Preferably, the retaining member 53 is an elastic member or a driving device; the elastic member is an elastic element, such as a spring, and the thrust provided by the elastic member originates from its elastic force; the driving device is an electrically driven element, including a motor and a drive rod, and the thrust provided by the driving device originates from the force of the motor controlling the drive rod to move outward; the elastic member is preferred because it has lower cost and does not require electricity.

[0037] Furthermore, even if one of the first conductors 42 or one of the second conductors 52 fails and causes a circuit break, the remaining first conductors 42 or the remaining second conductors 52 can remain conductive, and there will be no signal interruption problem.

[0038] Preferably, as shown in Figures 3 and 4, the first base 41 has a plurality of grooves 411, and the first conductors 42 are in the form of blocks and are respectively embedded in the grooves 411. In this way, the first conductors 42 are quite firmly fixed on the first base 41 and will not detach from the first base 41.

[0039] Preferably, as shown in Figures 5 and 6, the second base 51 has a plurality of grooves 511, and the retaining members 53 are respectively disposed in the grooves 511. The second conductors 52 are block-shaped and are respectively disposed in the grooves 511. In this way, the grooves 511 can restrict the movement of the second conductors 52 and the retaining members 53 in one direction, avoiding the problem of signal interruption caused by the shaking of the second conductors 52.

[0040] Preferably, as shown in Figures 5, 6, and 10, the two sidewalls and one bottom wall of each groove 511 together form two first receiving grooves 512, and each second conductor 52 has two second receiving grooves 521. The retaining members 53 are respectively located in the first receiving grooves 512 and the second receiving grooves 521. In this way, the retaining members 53 can provide a more uniform thrust to each second conductor 52, enabling each second conductor 52 to move in a balanced manner in a single direction, thus avoiding signal interruption caused by the deviation of the second conductors 52.

[0041] Preferably, as shown in Figures 5 and 6, each second receiving groove 521 extends through both sides of each second conductor 52, and the diameter of each first receiving groove 512 is greater than the height of each second receiving groove 521 (i.e., the thickness of the second conductor 52), such that both sides of each retaining member 53 extend through both sides of each second receiving groove 521. In this way, the present invention can make the second conductor 52 thinner to save material, while the size of the retaining members 53 is not too small, still providing sufficient thrust to push each second conductor 52.

[0042] Figure 19 is a perspective view of a second embodiment of the warehouse management system of the present invention. Figure 20 is a schematic diagram of region A in Figure 19. As shown in Figures 19 and 20, in terms of structure, the second embodiment differs from the first embodiment in that the cabinet 10A is a rotating cabinet.

[0043] Figure 21 is a schematic diagram of step S110 of the second embodiment of the warehouse management method of the present invention. Figure 22 is a schematic diagram of step S210 of the second embodiment of the warehouse management method of the present invention. In terms of method, the difference between the second embodiment and the first embodiment is that: in both step S110 and step S210, one of the storage racks 20 is moved to the material storage and retrieval area 12 by rotation.

[0044] FIG23 is a perspective view of the first electrical connection portion 40A according to another embodiment of the present invention. FIG24 is an exploded view of the first electrical connection portion 40A according to another embodiment of the present invention. FIG25 is a perspective view of the second electrical connection portion 50A according to another embodiment of the present invention. FIG26 is an exploded view of the second electrical connection portion 50A according to another embodiment of the present invention. As shown in FIG23 to FIG26, the differences between the other embodiments and the aforementioned embodiments are: firstly, the shape of the first base 41A is different; secondly, the second base 51A has a plurality of insertion holes 513 and a plurality of sleeves 514, which are respectively disposed in the insertion holes 513 and protrude from the insertion holes 513; thirdly, the retaining members 53 are respectively disposed in the sleeves 514; fourthly, the second conductors 52A are rod-shaped, respectively disposed in the sleeves 514, protruding from one end of the sleeves 514, and electrically connected to the control unit 60 through the sleeves 514.

[0045] FIG27 is a cross-sectional view of the first electrical connection portion 40A contacting the second electrical connection portion 50A according to another embodiment of the present invention. As shown in FIG27, when the storage rack 20 moves from the storage rack placement area 11 to the material storage and retrieval area 12, the retaining members 53 provide a pushing force to the second conductors 52A, so that the first conductors 42 remain in contact with the second conductors 52A. The sleeves 514 can restrict the movement of the second conductors 52A in one direction, avoiding the problem of signal interruption caused by the shaking of the second conductors 52A.

[0046] The above description is only for explaining the preferred embodiments of the present invention and is not intended to limit the present invention in any way. Therefore, any modifications or changes made to the present invention under the same inventive spirit should still be included in the scope of protection intended by the present invention. [Simplified Explanation of the Diagram]

[0017] Figure 1 is a perspective view of a first embodiment of the warehouse management system of the present invention. Figure 2 is a schematic diagram of the electrical connection relationship of each component in the first embodiment of the warehouse management system of the present invention. Figure 3 is a perspective view of the first electrical connection part of the present invention. Figure 4 is an exploded view of the first electrical connection part of the present invention. Figure 5 is a perspective view of the second electrical connection part of the present invention. Figure 6 is an exploded view of the second electrical connection part of the present invention. Figure 7 is a flowchart of the material picking process in the first embodiment of the warehouse management method of the present invention. Figure 8 is a schematic diagram of step S100 in the first embodiment of the warehouse management method of the present invention. Figure 9 is a schematic diagram of step S110 in the first embodiment of the warehouse management method of the present invention. Figure 10 is a cross-sectional view of the first electrical connection part contacting the second electrical connection part of the present invention. Figure 11 is a schematic diagram of step S120 in the first embodiment of the warehouse management method of the present invention. Figure 12 is a schematic diagram of step S130 in the first embodiment of the warehouse management method of the present invention. Figure 13 is a flowchart of the material feeding process in the first embodiment of the warehouse management method of the present invention. Figure 14 is a schematic diagram of step S200 in the first embodiment of the warehouse management method of the present invention. Figure 15 is a schematic diagram of step S210 in the first embodiment of the warehouse management method of the present invention. Figure 16 is a schematic diagram of step S220 of the first embodiment of the warehouse management method of the present invention. Figure 17 is a schematic diagram of step S230 of the first embodiment of the warehouse management method of the present invention. Figure 18 is a schematic diagram of step S240 of the first embodiment of the warehouse management method of the present invention. Figure 19 is a perspective view of the second embodiment of the warehouse management system of the present invention. Figure 20 is a schematic diagram of region A in Figure 19. Figure 21 is a schematic diagram of step S110 of the second embodiment of the warehouse management method of the present invention. Figure 22 is a schematic diagram of step S210 of the second embodiment of the warehouse management method of the present invention. Figure 23 is a perspective view of the first electrical connection portion of another embodiment of the present invention. Figure 24 is an exploded view of the first electrical connection portion of another embodiment of the present invention. Figure 25 is a perspective view of the second electrical connection portion of another embodiment of the present invention. Figure 26 is an exploded view of the second electrical connection portion of another embodiment of the present invention. Figure 27 is a cross-sectional view of the first electrical connection portion contacting the second electrical connection portion of another embodiment of the present invention.

Claims

1. A warehouse management system that uses a light source to indicate the location of stored materials, comprising: A cabinet, comprising a storage rack placement area, a material storage and retrieval area, and a moving device; A storage rack is disposed in the storage rack placement area and includes a plurality of material placement areas; a plurality of light sources are disposed in the storage rack and respectively correspond to the respective material placement areas; a first electrical connection includes a first base and at least one first conductor, the first base being disposed on one side of the storage rack placement area and the at least one first conductor being disposed on the first base; a second electrical connection includes a second base, at least one second conductor and at least one retainer, the second base being disposed in the material storage and retrieval area, the at least one second conductor being disposed on the second base, and the two ends of the at least one retainer abutting against the second base and the at least one second conductor respectively; The device includes a control unit electrically connected to the mobile device, the light sources, the at least one first conductor, and the at least one second conductor. When the control unit drives the mobile device to move the storage rack from the storage rack placement area to the material storage and retrieval area, the first electrical connection contacts the second electrical connection, and the at least one retainer provides a thrust to the at least one second conductor, so that the light sources, the first electrical connection, the second electrical connection, and the control unit are connected, and the at least one first conductor remains in contact with the at least one second conductor. The control unit also activates at least one of the light sources to indicate the position of at least one of the material placement areas.

2. The warehouse management system as described in claim 1, wherein, The first base has at least one groove, and the at least one first conductor is block-shaped and embedded in the at least one groove.

3. The warehouse management system as described in claim 1 or 2, wherein, The second base has at least one groove, the at least one second conductor is in the shape of a block and is disposed in the at least one groove, and the at least one retainer is disposed in the at least one groove.

4. The warehouse management system as described in claim 3, wherein, The two side walls and the bottom wall of the at least one groove together form at least one first receiving groove, the at least one second conductor has at least one second receiving groove, and the at least one retainer is located in the at least one receiving groove and the at least one second receiving groove.

5. The warehouse management system as described in claim 4, wherein, The two side walls and the bottom wall of the at least one groove together form a plurality of first accommodating grooves, the at least one second conductor has a plurality of second accommodating grooves, and the second electrical connection portion includes a plurality of retaining members, which are respectively located in the first accommodating grooves and the second accommodating grooves.

6. The warehouse management system as described in claim 4, wherein, The at least one second cavity extends through both sides of the at least one second conductor. The diameter of the at least one first cavity is greater than the height of the at least one second cavity. The width of the at least one retainer is less than the diameter of the at least one first cavity but greater than the height of the at least one second cavity, such that both sides of the at least one retainer extend through both sides of the at least one second cavity.

7. The warehouse management system as described in claim 1 or 2, wherein, The second base has at least one socket and at least one sleeve, the at least one sleeve is disposed in the at least one socket and protrudes from the at least one socket, the at least one retainer is disposed in the at least one sleeve, the at least one second conductor is rod-shaped, disposed in the at least one sleeve, protrudes from one end of the at least one sleeve, and is electrically connected to the control unit through the at least one sleeve.

8. The warehouse management system as described in claim 1, wherein, The cabinet can be a vertical cabinet or a rotating cabinet.

9. A warehouse management method for indicating the location of materials using light sources, comprising the following steps: a control unit drives a moving device of a cabinet to move a storage rack from a storage rack placement area of ​​the cabinet to a material storage and retrieval area of ​​the cabinet, and a first electrical connection contacts a second electrical connection, thereby connecting a plurality of light sources, the first electrical connection, the second electrical connection, and the control unit; and the control unit activates at least one of the light sources to indicate the location of at least one of the plurality of material placement areas of the storage rack; wherein, The first electrical connection includes a first base and at least one first conductor. The first base is disposed on one side of the storage rack placement area, and the at least one first conductor is disposed on the first base and electrically connected to the control unit. The second electrical connection includes a second base, at least one second conductor, and at least one retainer. The second base is disposed in the material storage area, and the at least one second conductor is disposed on the second base and electrically connected to the control unit. The two ends of the at least one retainer abut against the second base and the at least one second conductor, respectively. When the storage rack moves from the storage rack placement area to the material storage area, the at least one retainer provides a pushing force to the at least one second conductor, so that the at least one first conductor remains in contact with the at least one second conductor.

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