Topper system and method of topper

Abstract

The application discloses a packing system and a packing method. When the packing device starts, the WCS system receives the signal of allowing to send the next slot information sent by the packing device. When the WCS system receives the bar code information of the first goods sent by the packing device, the WCS system sends the slot information corresponding to the bar code information to the packing device after obtaining the slot information. When the n number of goods on the first conveying section completely leave the first conveying section, the packing device sends a signal of allowing to send the next slot information to the WCS system, wherein n is a positive integer. When the WCS system receives the signal of allowing to send the next slot information and the bar code information of any goods after the n number of goods, the WCS system sends the slot information corresponding to the bar code information to the packing device. The method can scan the bar codes of multiple goods first, and the next goods can be scanned without waiting for the goods to be output from the first conveying section, so that the operation efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of logistics sorting, and in particular to a packing system and packing method thereof. Background Technology

[0002] The main types of bag feeding methods for cross-belt sorters are automatic bag feeding and manual / semi-automatic bag feeding.

[0003] The automatic package feeding system consists of a package feeding control computer, multiple package feeding belts, an AC motor, a dynamic weight scale, photoelectric position detection switches, a light curtain, and a barcode reader. Generally, the package feeding station has three to seven belt sections, divided into an inlet section, an acceleration section, and a feeding section. Automatic package feeding places high demands on incoming packages, typically requiring individual package separation and a six-sided barcode scanning structure. Furthermore, due to the use of dynamic barcode scanning, scanning failures are more likely to occur, increasing the volume of abnormal packages handled due to scanning failures.

[0004] The manual semi-automatic package feeding system consists of an automatic package feeding station and a manual placement station. The operator either holds a barcode scanner or manually places the goods onto the scanner for scanning. Typically, after one item is output from the first conveyor section of the feeding station, another item is scanned and placed onto the first conveyor section for transport. This method has lower requirements for incoming goods; goods can be stacked and the barcode orientation is not critical. Scanning failures are relatively few and can be handled immediately. However, during operation, it is necessary to wait for one item to be output to the next conveyor section before scanning the next item, resulting in relatively low efficiency. Summary of the Invention

[0005] The purpose of this invention is to solve the above-mentioned problems existing in the prior art and to provide a packaging system and packaging method thereof.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] The packaging system includes a packaging device and a WCS system. The packaging device includes at least a first conveying section and a second conveying section. The communication process between the packaging device and the WCS system includes the packaging device requesting grid information from the WCS system and the WCS system sending grid information to the packaging device.

[0008] When the package feeding device is started, the WCS system receives a signal from the package feeding device that allows the sending of the next compartment information. When the WCS system receives the barcode information of the first item sent to it by the package feeding device, it obtains the compartment information corresponding to the barcode information and sends the compartment information to the package feeding device.

[0009] and, when the nth item on the first conveying section completely leaves the first conveying section, the package providing device sends a signal allowing sending of next bin information to the WCS system, wherein n is a positive integer; and the WCS system sends bin information corresponding to the barcode information of the nth item to the package providing device after receiving the signal allowing sending of next bin information and the barcode information of any item.

[0010] Preferably, the package providing device starts the first conveying section to convey the first item or the nth item when the state of the items on the second conveying section meets the starting condition of the first conveying section after receiving the bin information; and the package providing device stops the first conveying section and sends a signal allowing sending of next bin information to the WCS system when the first item or the nth item completely leaves the first conveying section.

[0011] Preferably, the package providing device comprises a first sensor for detecting whether there is an item on the first conveying section and triggering the scanning of the barcode by the scanning device; when the first sensor is triggered, the scanning device starts scanning, and the package providing device sends the barcode information to the WCS system when the scanning succeeds.

[0012] Preferably, the trigger signal of the first sensor is subjected to a debounce filtering process.

[0013] Preferably, the scanning device produces a sound when the scanning succeeds and / or fails, and replaces the item on the first conveying section with another item when the scanning fails.

[0014] Preferably, the package providing device determines whether the item on the first conveying section is replaced before or when the first conveying section starts according to the real-time signal of the first sensor.

[0015] When it is determined that the item is replaced, it is determined whether the scanning of the item before replacement succeeds.

[0016] When it is determined that the scanning of the item before replacement succeeds, the PLC keeps the first conveying section stopped and sends an alarm to remind manual processing.

[0017] When it is determined that the scanning of the item before replacement fails, the PLC keeps the first conveying section stopped, and the WCS system sends the bin information corresponding to the barcode information of the replaced item to the package providing device.

[0018] Preferably, when the previous goods scanning code fails, the next goods scanning code succeeds, and the previous goods are supplied to the sorting trolley, the next goods are scanned again, the PLC determines whether the previous goods are dropped, if it is determined that the previous goods are not dropped, the bin information of the previous goods is modified as an abnormal piece bin and sent to the WCS system; if it is determined that the previous goods are dropped, the information is sent to the WCS system to lock the bin of the previous goods and no longer drop the bin.

[0019] Preferably, a detection light curtain is arranged between the first conveying section and the second conveying section.

[0020] The PLC receives the signal of the detection light curtain and determines whether there are multiple goods following pieces according to the signal of the detection light curtain.

[0021] When it is determined that there are multiple goods following pieces, the PLC sends an alarm and stops the first conveying section and the second conveying section, and sends the following piece information to the WCS system;

[0022] The PLC controls the first conveying section and the second conveying section to reversely convey the multiple goods of the following pieces to the upper package position of the first conveying section according to the back-off start and stop signals;

[0023] The multiple goods of the following pieces are taken off and a reset signal is sent to the PLC;

[0024] After receiving the reset signal, the PLC sends a signal allowing the next bin information to be sent and a reset signal to the WCS;

[0025] When receiving the following piece information or the empty buffer queue information, the WCS system empties the buffer queue and waits to receive the next code information.

[0026] Preferably, when the distance between the two consecutive goods is less than 10cm according to the signal of the detection light curtain, it is determined that there are following pieces.

[0027] The upper package method of the upper package system as described above, comprising the following steps

[0028] S01, receiving a package device start signal, and sending a signal allowing the bin information to be sent to the WCS system;

[0029] S02, receiving a trigger signal of the first sensor;

[0030] S03, starting the scanning code device to scan the code, and sending the code information to the WCS system after the scanning code succeeds;

[0031] S04, after receiving the bin information of each goods from the WCS system, starting the first conveying section to convey, when the first goods on the first conveying section completely moves out of the first conveying section, stopping the first conveying section and sending a signal allowing sending next bin information to the WCS system;

[0032] S05, when the trigger signal of the first sensor is received again, performing S03.

[0033] The advantages of the technical scheme of the present application mainly include:

[0034] The method can first scan the barcodes of multiple goods, so that the WCS system obtains the bin information corresponding to each barcode and forms a queue, and when a signal allowing sending next bin information is received, one bin information is sent to the package providing device according to the queue, so that the barcode scanning of the next goods is not required after the goods are output from the first conveying section, which is beneficial to improve the operation efficiency.

[0035] The first sensor can effectively identify whether the goods on the first conveying section are replaced, and the package providing can be effectively stopped when replacement is found, so that the foolproofness is effectively improved, the misoperation is avoided, and when replacement is found and the barcode scanning of the previous goods is not successful, the WCS system can continue to send bin information, so that the manual intervention is reduced and the efficiency is improved.

[0036] The trigger signal of the first sensor is subjected to anti-shake filtering processing, so that the mis-triggering situation is effectively prevented.

[0037] The method of the present application can determine the sorting state of the previous goods by re-scanning when the barcode scanning of the previous goods fails and the barcode scanning of the next goods succeeds, and when the previous goods are not sorted, the previous goods are dropped into an abnormal piece bin, when the previous goods are sorted, the bin is locked, and the manual processing is reminded, so that the cross-belt sorting is not affected, the staff can quickly check the mis-sorted previous goods, the processing capacity of abnormal situations is improved, and the sorting accuracy is ensured.

[0038] The light curtain can effectively identify whether the goods exist in the following piece situation, and when the following piece situation is found, the conveying of the first conveying section and the second conveying section is immediately stopped and an alarm is given to remind the manual processing, so that the following piece problem is solved in the first time, the subsequent abnormal processing is avoided, and the package accuracy is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a schematic view of the package providing device of the present application;

[0040] Figure 2 Figure 1 is a schematic diagram of a package feeding device and a WCS system in communication. DETAILED DESCRIPTION

[0041] The purposes, advantages and features of the present application will be illustrated and explained by the following non-limiting description of preferred embodiments. These embodiments are merely typical examples of the application, and any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of the present application.

[0042] In the description of the scheme, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of description and simplification of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Also, in the description of the scheme, the direction close to the operator is the proximal end, and the direction away from the operator is the distal end.

[0043] The upper packaging method of the upper packaging system disclosed in the present application will be described below in conjunction with the drawings, wherein the upper packaging system comprises a package feeding device and a WCS system (warehouse control system), as shown in Figure 1. Figure 1 As shown, the package feeding device at least comprises a first conveying section 1, a second conveying section 2 and a third conveying section 3 which are sequentially connected and can be started and stopped respectively. The input end of the first conveying section 1 is provided with a guide 4, and the guide 4 is formed with an L-shaped guide notch 41. When the square goods are conveyed onto the sorting trolley, the L-shaped guide notch 41 makes the square goods in a right state.

[0044] An upper side of the first conveying section 1 is provided with a code scanning device (not shown in the figure), and a code scanning area of the code scanning device at least covers the L-shaped guide notch 41. The code scanning device can read the bar code of the goods at the L-shaped guide notch. The code scanning device preferably uses a scanning hand to read the code, and when the code scanning device successfully scans the code, it can issue a sound reminder, for example, it can issue a voice reminder of "scanning success". When the code scanning fails, it can not issue a sound reminder, of course, it can also issue a sound reminder, for example, it can issue a voice reminder of "scanning failure", so as to facilitate the operator to know whether the code scanning is successful or not in real time and intuitively. The structure of the code scanning device using the scanning hand to read the code is a known technology in the field of logistics sorting, which will not be described here. Of course, other structures capable of reading the code can also be used.

[0045] The feeding device further comprises a first sensor (not shown in the figure) for triggering the code scanning device, which is preferably a diffuse reflection photoelectric sensor, and its setting can be set as required, which is not limited here. When the first sensor senses the goods, it is triggered and sends a signal to the PLC, which sends a signal to start the code scanning device for code scanning. The first sensor is also used to determine whether there are goods at the guide 4 of the first conveying section 1, so that the PLC can determine whether the goods on the first conveying section 1 need to be replaced according to the signal of the first sensor.

[0046] As shown in the accompanying Figure 2 When the feeding device and the WCS communicate (the feeding device communicates with the WCS system through the PLC), it includes the process of the feeding device requesting bin information from the WCS system and the WCS system sending bin information to the feeding device, wherein:

[0047] When the feeding device starts, the PLC of the feeding device sends a signal to the WCS system allowing the next bin information to be sent, the WCS system receives the signal allowing the next bin information to be sent sent by the feeding device, and when the WCS system receives the barcode information of the first goods sent by the feeding device, it can send the bin information corresponding to the barcode information to the feeding device after obtaining the bin information.

[0048] When the n-th goods on the first conveying section 1 completely leave the first conveying section 1, the feeding device sends a signal to the WCS system allowing the next bin information to be sent, wherein n is a positive integer; the WCS system sends the bin information corresponding to the barcode information of any goods after receiving the signal allowing the next bin information to be sent and the n-th goods to the feeding device, and the WCS clears the bin information in the buffer queue after sending a bin information to the PLC.

[0049] After the feeding device receives the bin information, it starts the first conveying section 1 to convey the first goods or the n-th goods when the state of the goods on the second conveying section 2 meets the starting condition of the first conveying section 1; and stops the first conveying section 1 and sends a signal to the WCS system allowing the next bin information to be sent when the first goods or the n-th goods completely leave the first conveying section 1.

[0050] By allowing the WCS system to send a bin information to the feeding device only when it receives a signal allowing the next bin information to be sent, multiple goods can be scanned first, so that the WCS system obtains the bin information corresponding to each barcode and puts it into the buffer queue, and when there is a signal allowing the next bin information to be sent, a bin information is sent to the feeding device in the order of the buffer queue, which is conducive to improving the operation efficiency.

[0051] Specifically, when the feeding device starts, the PLC sends a first signal allowing sending of next bin information to the WCS system, and the WCS system stores the signal and waits to receive barcode information.

[0052] When the first goods is placed on the first conveying section 1 by a person, the first sensor is triggered, at which time the PLC of the feeding device controls the code scanning device to start scanning, and the PLC sends the barcode information of the first goods to the WCS system after successful scanning. After receiving the barcode information, the WCS system obtains the corresponding bin information. At this time, since the WCS system has received a signal allowing sending of next bin information, the WCS system can send the bin information to the PLC after obtaining the bin information of each goods. After receiving the bin information, the PLC starts the first conveying section 1 to convey the first goods on it to the second conveying section 2. When the first goods completely leaves the first conveying section 1, the PLC controls the first conveying section 1 to stop conveying and sends a second signal allowing sending of next bin information to the WCS system, and the WCS system stores the second signal allowing sending of next bin information.

[0053] After the first goods is scanned, the scanning of the second goods can be immediately performed. At this time, the first goods is still on the first conveying section 1, and the second goods should not be placed on the first conveying section 1. When the first goods is conveyed out of the first conveying section and the first conveying section stops, the second goods is placed on the first conveying section 1.

[0054] After receiving the barcode information of the second goods, the WCS system obtains the corresponding bin information and stores it in a cache queue. If the WCS system obtains the barcode information of the second goods after obtaining the second signal allowing sending of next bin information, the WCS system can send the bin information of the second goods to the PLC after obtaining the bin information. If the WCS system obtains the barcode information of the second goods before obtaining the second signal allowing sending of next bin information, the WCS system can send the bin information to the PLC after obtaining the second signal allowing sending of next bin information.

[0055] When the state of the goods on the second conveying section 2 meets the starting condition of the first conveying section 1, the PLC starts the first conveying section 1 to output the second goods from the first conveying section 1 and sends a third signal allowing sending of next bin information to the WCS. The condition that the state of the goods on the second conveying section 2 meets the starting condition of the first conveying section 1 can be that the second conveying section 2 has started conveying or the second conveying machine is in a stopped state and has no goods on it.

[0056] After the second goods is placed to the first conveying section 1, the third goods can be scanned, and the WCS sends the slot information of the third goods to the PLC again according to the above process.

[0057] The above process is repeated, and the fourth, fifth, sixth, and Nth goods are continuously conveyed to the second conveying section 2.

[0058] Further, the trigger signal of the first sensor is subjected to a debounce filtering process, and the specific technology of the debounce filtering process is a known technology, which is not described here. Compared with no filtering process, the debounce filtering process for a certain time length can effectively reduce the mechanical and artificial false triggering. The time of the debounce filtering process can be adjusted according to the actual situation, for example, 50 ms (milliseconds).

[0059] When the scanning of the scanning device fails, the goods on the first conveying section 1 need to be replaced with another goods. If the WCS has obtained the signal allowing the next slot information to be sent before determining that the scanning fails, when a new goods is replaced for scanning, the WCS system can still send the slot information of the new goods to the PLC. This replacement is necessary in actual operation, but in some cases, there may be some misoperations, for example, when a goods A located on the first conveying section 1 is successfully scanned, and the worker replaces the goods A with goods B while waiting to be conveyed to the second conveying section 2, this replacement will cause the goods B to be misclassified.

[0060] In order to avoid this problem, the supply device determines whether the goods on the first conveying section 1 are replaced before or at the start of the first conveying section 1 according to the real-time signal of the first sensor; when the first sensor is triggered by the goods, if the goods are not conveyed, the first sensor should always be in the triggered state, and if the first sensor detects the goods again after a period of time when the goods cannot be detected, the PLC can determine that the goods are replaced. The time difference from when the goods cannot be detected to when the goods are detected again can be designed according to actual needs, for example, 200 ms.

[0061] When it is determined that the goods are replaced, it is determined whether the goods before replacement are scanned successfully;

[0062] When it is determined that the goods before replacement are scanned successfully, the PLC keeps the first conveying section 1 stopped and sends an alarm to remind manual processing; the worker replaces the goods on the first conveying section 1 back;

[0063] When it is determined that the goods before replacement are scanned unsuccessfully, the PLC keeps the first conveying section 1 stopped, and the WCS system sends the slot information corresponding to the bar code information of the replaced goods to the supply device (this case is the case that the goods scanning fails and the goods need to be replaced for scanning).

[0064] For example, first put the goods A on the first conveying section 1, the first sensor is triggered, when the first conveying section 1 is not started or just started, the goods A is replaced by goods B; at this time if the goods A scan code is successful, the first conveying section 1 is kept stopped, the goods B is replaced by goods A manually, and then the first conveying section 1 is started again for conveying, and the signal of starting again can be input through the start button or other ways.

[0065] When the goods A scan code is not successful, the first conveying section 1 is kept stopped, and at this time the WCS allows the next bin information to be sent to the PLC, that is, after the goods B is replaced, the scan code is successful, and the WCS system allows the obtained bin information of the goods B to be sent to the PLC.

[0066] Of course, in actual application, there are some other special situations, for example, when the previous goods scan code fails and the next goods scan code succeeds, at this time, if the operator forgets to put the previous goods on the first conveying section 1, when the PLC obtains the bin information of the next goods, the first conveying section 1 will be started for conveying. Before the previous goods is conveyed to the sorting trolley, if it is found, the previous goods can be returned to the manual package position manually through the stop key, return key and the like, and the previous goods is taken down and reset manually or by a mechanical hand, and the PLC sends a signal to the WCS to allow the next bin information to be sent after receiving the reset signal.

[0067] However, when it is found that the previous goods has been supplied to the sorting trolley, the goods cannot be returned, at this time, the scan code of the next goods can be performed manually again, at this time, the PLC determines whether the previous goods is not packed, if it is determined that the previous goods is not packed, the bin information of the previous goods is modified as an abnormal bin and sent to the WCS system; if it is determined that the previous goods is packed, the WCS system is informed to lock the bin where the previous goods falls and no longer continue to pack, that is, when the bin information of the next goods is the bin of the locked bin, the WCS can send the abnormal bin information to the PLC. Whether the goods falls into the bin is determined manually, if the bin is wrong, the goods is taken out and a recovery signal is sent to the WCS system through the recovery button and the like, and the WCS system makes the bin recover to pack, that is, the WCS can send the bin information to the PLC when the bin of the goods corresponds to the bin that recovers to pack. If the manual confirmation shows that the bin is correct, the bin can be directly recovered to pack.

[0068] Further, in some cases, another goods after scan code is placed on the first conveying section 1 for conveying when the first conveying section 1 is conveying, at this time, the second goods cannot be accurately conveyed to the sorting trolley, and this problem also needs to be overcome.

[0069] Therefore, the detection light curtain 5 is arranged between the first conveying section 1 and the second conveying section 2; the PLC receives the signal of the detection light curtain 5 and determines whether there are multiple goods (two or more goods) according to the signal of the detection light curtain 5; when it is determined according to the signal of the detection light curtain 5 that the interval between two consecutive goods is not more than 10 cm, it is determined that there are multiple goods; of course, the interval can also be adjusted according to needs. When there are no multiple goods, the bag feeding device operates normally.

[0070] When it is determined that there are multiple goods, the PLC sends an alarm and stops the first conveying section 1 and the second conveying section 2, and sends the multiple goods information to the WCS system; when the WCS system receives the multiple goods information, it clears the cache queue and receives the signal of allowing sending the next compartment information, and waits to receive the next barcode information.

[0071] When the manual back key is pressed, the PLC controls the first conveying section 1 and the second conveying section 2 to reversely convey the multiple goods back to the bag feeding position of the first conveying section 1 according to the back signals of the back key.

[0072] The multiple goods are manually or mechanically taken off from the first conveying section, and the reset key is pressed to send the reset signal to the PLC.

[0073] After receiving the reset signal, the PLC sends the signal of allowing sending the next compartment information and the reset signal to the WCS; when the WCS system receives the reset signal, it also clears the cache queue and waits to receive the next barcode information. At the same time, when the WCS system receives the signal of allowing sending the next compartment information, it can send the compartment information corresponding to the next barcode information to the PLC when receiving the next barcode information.

[0074] Embodiment 2

[0075] The embodiment discloses a bag feeding method of a bag feeding system, and mainly describes the working process of the PLC during bag feeding, which comprises the following steps:

[0076] S01, the PLC receives the bag feeding device start signal and sends the signal of allowing sending the compartment information to the WCS system;

[0077] S02, the PLC receives the trigger signal of the first sensor;

[0078] S03, the PLC starts the code scanning device to scan the code, and sends the barcode information to the WCS system after successful code scanning;

[0079] S04, after the S04, PLC receives the information of each goods' compartment from the WCS system, the first conveying section 1 is started to convey, when the first goods on the first conveying section 1 completely moves out of the first conveying section 1, the first conveying section 1 is controlled to stop and a signal allowing the next compartment information to be sent is sent to the WCS system;

[0080] S05, when the trigger signal of the first sensor is received again, S03 is executed.

[0081] The present application has various embodiments, and all the technical solutions formed by using equivalent transformation or equivalent transformation fall within the protection scope of the present application.

Claims

1. A wrapping system, comprising a wrapping device and a WCS system, the wrapping device comprising at least a first conveying section and a second conveying section, and the communication process between the wrapping device and the WCS system comprising the process that the wrapping device requests the WCS system for bin information and the WCS system sends the bin information to the wrapping device, characterized in that: when the wrapping device starts, the WCS system receives the signal sent by the wrapping device to allow sending the next bin information, and when the WCS system receives the barcode information of the first goods sent by the wrapping device, the WCS system sends the bin information corresponding to the barcode information to the wrapping device after obtaining the bin information; and when the nth goods on the first conveying section completely leave the first conveying section, the wrapping device sends a signal to the WCS system to allow sending the next bin information, wherein n is a positive integer; and the WCS system sends the bin information corresponding to the barcode information of any goods after receiving the signal to allow sending the next bin information and the nth goods to the wrapping device; after the wrapping device receives the bin information, when the state of the goods on the second conveying section meets the starting condition of the first conveying section, the wrapping device starts the first conveying section to convey the first goods or the nth goods; and when the first goods or the nth goods completely leave the first conveying section, the wrapping device stops the first conveying section and sends a signal to the WCS system to allow sending the next bin information; the WCS system puts the bin information corresponding to each barcode into a cache queue when obtaining the bin information, and sends the bin information to the wrapping device in turn according to the order of the cache queue when receiving a signal to allow sending the next bin information.

2. The overbag system of claim 1, wherein: the wrapping device comprises a first sensor for detecting whether there are goods on the first conveying section and triggering the scanning of the barcode by the scanning device; when the first sensor is triggered, the scanning device starts scanning, and the wrapping device sends the barcode information to the WCS system when the scanning is successful.

3. The overwrapping system of claim 2, wherein: the trigger signal of the first sensor is subjected to a debounce filtering process.

4. The overwrapping system of claim 2, wherein: when the scanning of the barcode by the scanning device is successful and / or fails, a sound is produced to remind, and when the scanning of the barcode by the scanning device fails, the goods on the first conveying section are replaced with another goods.

5. The overwrapping system of claim 2, wherein: the wrapping device determines whether the goods on the first conveying section are replaced before or when the first conveying section starts according to the real-time signal of the first sensor; when it is determined that the goods are replaced, it is determined whether the scanning of the goods before replacement is successful; when it is determined that the scanning of the goods before replacement is successful, the PLC keeps the first conveying section stopped and sends an alarm to remind manual processing; when it is determined that the scanning of the goods before replacement fails, the PLC keeps the first conveying section stopped, and the WCS system sends the bin information corresponding to the barcode information of the goods after replacement to the wrapping device.

6. The overwrapping system of claim 1, wherein: When the previous goods code scanning fails, the next goods code scanning succeeds, and the previous goods are supplied to the sorting trolley, the next goods are scanned again, the PLC determines whether the previous goods are dropped, if it is determined that the previous goods are not dropped, the bin information of the previous goods is modified as an abnormal piece bin and sent to the WCS system; if it is determined that the previous goods are dropped, the WCS system is informed to lock the bin where the previous goods are dropped and no longer drop.

7. The system according to claim 1, wherein: A detection light curtain is arranged between the first conveying section and the second conveying section; The PLC receives the signal of the detection light curtain and determines whether there are multiple goods following according to the signal of the detection light curtain; When it is determined that there are multiple goods following, the PLC sends an alarm and stops the first conveying section and the second conveying section, and sends the following information to the WCS system; The PLC controls the first conveying section and the second conveying section to convey in reverse according to the back-up start and stop signals, so that the multiple goods following are returned to the packing position of the first conveying section; The multiple goods following are taken off and a reset signal is sent to the PLC; After receiving the reset signal, the PLC sends a signal allowing the next bin information to be sent to the WCS and a reset signal; When the WCS system receives the following information and the reset signal, it clears the cache queue and waits to receive the next code information.

8. The overwrapping system of claim 7, wherein: When the distance between the two consecutive goods is determined to be less than 10 cm according to the signal of the detection light curtain, it is determined that there are goods following.

9. The top-up method of a top-up system according to any one of claims 1-8, characterized in that, The method comprises the following steps: S01, receiving a packing device start signal and sending a signal allowing the next bin information to be sent to the WCS system; S02, receiving a trigger signal of the first sensor; the first sensor is used to detect whether there are goods on the first conveying section and trigger the code scanning device of the packing device to scan the code; S03, starting the code scanning device to scan the code, and sending the code information to the WCS system after the scanning succeeds; the WCS system puts the bin information corresponding to each code into the cache queue when obtaining the bin information, and sends a bin information to the packing device in turn according to the order of the cache queue when receiving a signal allowing the next bin information to be sent; S04, after receiving the bin information of each goods fed back by the WCS system, starting the first conveying section to convey when the goods state of the second conveying section meets the starting condition of the first conveying section, and stopping the first conveying section and sending a signal allowing the next bin information to be sent to the WCS system when the first goods on the first conveying section completely move out of the first conveying section; S05, when the trigger signal of the first sensor is received again, S03 is executed.

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