Unmanned reservoir area tail roll occupation detection method and occupation detection system

Abstract

The invention provides an unmanned reservoir area tail roll occupation detection method and system, and the method comprises the following steps: transferring a tail roll to a saddle between a range finder and a reflector, and enabling the tail roll to be transferred to the saddle between the range finder and the reflector every time when the tail roll is transferred to the saddle between the range finder and the reflector; the tail coil needs to be placed on an empty saddle farthest from the range finder; the tail roll on the saddle between the range finder and the reflector is rolled out from the reservoir area, and the tail roll closest to the range finder is rolled out in the process of rolling out the tail roll between the range finder and the reflector every time; meanwhile, the distance measuring instrument emits detection light and feeds back measured distance information to the PLC control device, and the PLC control device judges the tail coil occupation condition according to the measured distance information.

Description

Technical Field

[0001] The invention relates to the technical field of storage and transfer of tail rolls in a warehouse area, and in particular to an unmanned warehouse area tail roll occupancy detection method and occupancy detection system. Background Art

[0002] As industrial technology continues to develop in the direction of intelligence and unmanned operation, unmanned driving technology has been tested and put into use in many places and multiple factories, contributing to the intelligence and unmanned operation of factories in various places, and filling a large gap in the Internet of Things for factory logistics information, so that the logistics of steel coils in the unmanned areas of the factory have clear circulation paths and information traceability conditions. However, in the process of steel coil production, due to production process reasons, it is inevitable to produce tail coils with a few layers of steel coils. These tail coils need to be placed uniformly. After reaching a certain number, these scrapped small tail coils are forked out by forklifts and placed on trucks for transportation. Since all forklifts are ordinary forklifts, when the forklift forks out the corresponding tail roll, the specific information of whether there is a tail roll on each saddle in the warehouse area cannot be obtained in time. For this reason, the existing technology usually requires the main operator to watch the monitoring and count whether there is a tail roll on each saddle, that is, manually check the monitoring and count the tail roll occupancy situation. This method will increase the workload of the main operator, resulting in high labor intensity of the staff, and due to human negligence, the tail roll occupancy situation will not be counted in time, resulting in abnormal situations such as stacking of rolls, affecting the safety and efficiency of the operation. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide an unmanned warehouse tail roll occupancy detection method that can obtain the tail roll occupancy status and reduce the labor intensity of the staff.

[0004] To achieve the above object, the present invention provides a method for detecting the occupancy of a tail roll in an unmanned storage area, wherein a rangefinder is provided at one end of the storage area, a reflector is provided at the other end of the storage area, the rangefinder faces the reflector, a plurality of saddles in the storage area are located between the rangefinder and the reflector, and all the saddles between the rangefinder and the reflector are sequentially distributed along the extension direction of the detection light emitted by the rangefinder; the method for detecting the occupancy of a tail roll in an unmanned storage area comprises the following steps:

[0005] The tail roll is transferred to the saddle between the rangefinder and the reflector, and each time the tail roll is transferred to the saddle between the rangefinder and the reflector, the tail roll must be placed on the empty saddle farthest from the rangefinder;

[0006] The tail roll on the saddle between the rangefinder and the reflector is rotated out from the storage area, and each time the tail roll between the rangefinder and the reflector is rotated out, the tail roll closest to the rangefinder is selected to be rotated out;

[0007] At the same time, the rangefinder emits a detection light. When there is a tail roll between the rangefinder and the reflector, the detection light will be irradiated on the tail roll closest to the rangefinder. At this time, the rangefinder will measure the distance of the tail roll closest to the rangefinder; when there is no tail roll between the rangefinder and the reflector, the detection light will be irradiated on the reflector. At this time, the rangefinder will detect the distance between the reflector and the rangefinder; the rangefinder will feed back the measured distance information to the PLC control device, and the PLC control device will determine the occupancy of the tail roll based on the measured distance information.

[0008] Furthermore, the method for the PLC control device to determine the tail roll occupancy status according to the measured distance information is as follows:

[0009] All the saddles along the extension direction of the detection light emitted by the rangefinder are the first saddle, the second saddle, ..., the Nth saddle, N is a positive integer, the first saddle is closest to the rangefinder, and the distance between the first saddle and the rangefinder is A, and the width of the saddle along the extension direction of the detection light emitted by the rangefinder is B;

[0010] When the measured distance is [(A-B+B×n), (A+B×n)), the nth saddle to the Nth saddle is occupied by the tail roll, n is a positive integer, and 1≤n <N;

[0011] When the measured distance is [(A-B+B×N),(A+B×N)), then only the Nth saddle is occupied by the tail roll;

[0012] When the measured distance is greater than A+B×N, all the saddles between the rangefinder and the reflector are not occupied.

[0013] Furthermore, the PLC control device sends the determined tail roll occupancy status to the WMS system. The WMS system includes a library map module, which contains the tail roll occupancy information of the library area. The WMS system updates the tail roll occupancy information of the library area in the library map module according to the tail roll occupancy status determined by the PLC control device.

[0014] Furthermore, the warehouse area includes a sliding door, which includes a sliding drive unit and a door body connected to the sliding drive unit, the sliding drive unit is communicatively connected to the PLC control device, and the PLC control device is communicatively connected to the WMS system; in the process of transferring the tail roll in the warehouse area, the operator inputs a door opening command through the operation interface of the WMS system, the WMS system sends a door opening signal to the PLC control device, and the PLC control device controls the operating state of the sliding drive unit to open the door body; the operator inputs a door closing command through the operation interface of the WMS system, the WMS system sends a door closing signal to the PLC control device, and the PLC control device controls the operating state of the sliding drive unit to close the door body.

[0015] Furthermore, the PLC control device is also communicatively connected with the alarm light. When the PLC control device sends a door opening command to the push-pull drive unit, the PLC control device controls the alarm light to emit a door opening sound and light reminder; when the PLC control device sends a door closing command to the push-pull drive unit, the PLC control device controls the alarm light to emit a door closing sound and light reminder.

[0016] As described above, the unmanned warehouse tail roll occupancy detection method according to the present invention has the following beneficial effects:

[0017] The unmanned warehouse tail roll occupancy detection method is based on the above steps. When placing the tail roll, the tail roll is preferentially placed on the empty saddle farthest from the rangefinder, and when the tail roll on the saddle is transferred out of the warehouse, the tail roll close to the rangefinder is preferentially transferred out first to ensure that the tail rolls are not placed at intervals, and to avoid the situation where there is a tail roll on the saddle close to the rangefinder and the saddle far from the rangefinder is empty. In this way, after the rangefinder feeds back the measured distance information to the PLC control device, and when there is a tail roll on the saddle, the PLC control device can determine the position of the tail roll closest to the rangefinder according to the distance information. And it is judged that the saddle closer to the rangefinder than the position is empty, and the saddle farther from the rangefinder than the position has the tail roll, thereby judging the position occupied by the tail roll on the saddle; when all the saddles are empty, the PLC control device will judge that the measured object is a reflector according to the measured distance information, thereby judging that all the saddles are empty, thus realizing the detection and acquisition of the position occupied by the tail roll; and this method can accurately obtain the position occupied by the tail roll, the implementation method is simple, and there is no need for the staff to count the position occupied by the tail roll by observation, thereby reducing the workload and labor intensity of the staff.

[0018] Another technical problem to be solved by the present invention is to provide an occupancy detection system capable of detecting the occupancy of the tail roll.

[0019] To achieve the above-mentioned purpose, the present invention provides an occupancy detection system for realizing the unmanned warehouse tail roll occupancy detection method, including a rangefinder arranged at one end of the warehouse area, and a reflector arranged at the other end of the warehouse area, the rangefinder faces the reflector, and multiple saddles in the warehouse area are located between the rangefinder and the reflector, and all the saddles located between the rangefinder and the reflector are distributed in sequence along the extension direction of the detection line emitted by the rangefinder, and the rangefinder is communicatively connected to a PLC control device.

[0020] Furthermore, the PLC control device is communicatively connected with a WMS system, and the WMS system includes a library map module, and the library map module contains the tail volume placeholder information of the library area.

[0021] Furthermore, the warehouse area is provided with a sliding door, which includes a sliding drive unit and a door body connected to the sliding drive unit, the sliding drive unit is communicatively connected to the PLC control device, the PLC control device is communicatively connected to the WMS system, and the WMS system includes an operation interface.

[0022] Furthermore, the PLC control device is also communicatively connected to the alarm light.

[0023] Furthermore, the rangefinder is a laser rangefinder.

[0024] As described above, the occupancy detection system according to the present invention has the following beneficial effects:

[0025] This occupancy detection system, based on the above-mentioned unmanned warehouse tail roll occupancy detection method, realizes the detection and acquisition of the tail roll occupancy situation. The tail roll occupancy information obtained in this way is more accurate and the acquisition method is simpler. There is no need for staff to count the tail roll occupancy situation by observation, which reduces the workload and labor intensity of staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the occupancy detection system of the present invention.

[0027] Component number description

[0028] 100 Reservoir

[0029] 1 Rangefinder

[0030] 11. Laser rangefinder

[0031] 2 Reflectors

[0032] 3 Saddle

[0033] 31 First Saddle

[0034] 32 Second Saddle

[0035] 4 End roll

[0036] 5 PLC control device

[0037] 6 Sliding Doors

[0038] 7. WMS System

[0039] 8 Warning lights

[0040] 9 Fence DETAILED DESCRIPTION

[0041] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0042] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportion relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0043] like Figure 1 As shown, this embodiment provides an occupancy detection system, including a rangefinder 1 arranged at one end of a storage area 100, and a reflector 2 arranged at the other end of the storage area 100, the rangefinder 1 faces the reflector 2, a plurality of saddles 3 of the storage area 100 are located between the rangefinder 1 and the reflector 2, and all the saddles 3 located between the rangefinder 1 and the reflector 2 are distributed in sequence along the extension direction of the detection line emitted by the rangefinder 1, and the rangefinder 1 is communicatively connected to the PLC control device 5.

[0044] At the same time, if Figure 1 As shown, this embodiment provides an unmanned warehouse tail roll occupancy detection method using the above occupancy detection system, comprising the following steps:

[0045] The tail roll 4 is transferred to the saddle 3 between the rangefinder 1 and the reflector 2, and each time the tail roll 4 is transferred to the saddle 3 between the rangefinder 1 and the reflector 2, the tail roll 4 needs to be placed on the empty saddle 3 farthest from the rangefinder 1; that is, each time the tail roll 4 is transferred to the saddle 3, the tail roll 4 is placed on the empty saddle 3 farthest from the rangefinder 1 first.

[0046] The tail roll 4 on the saddle 3 between the rangefinder 1 and the reflector 2 is rotated out from the storage area 100, and each time the tail roll 4 between the rangefinder 1 and the reflector 2 is rotated out, the tail roll 4 closest to the rangefinder 1 is selected to be rotated out, that is, each time the tail roll 4 is rotated out of the storage area 100, the tail roll 4 close to the rangefinder 1 is preferentially rotated out;

[0047] At the same time, the rangefinder 1 emits a detection light. When there is a tail roll 4 between the rangefinder 1 and the reflector 2, the detection light will be irradiated on the tail roll 4 closest to the rangefinder 1. At this time, the rangefinder 1 will measure the distance of the tail roll 4 closest to the rangefinder 1; when there is no tail roll 4 between the rangefinder 1 and the reflector 2, the detection light will be irradiated on the reflector 2. At this time, the rangefinder 1 will detect the distance between the reflector 2 and the rangefinder 1; the rangefinder 1 feeds back the measured distance information to the PLC control device 5, and the PLC control device 5 determines the occupancy of the tail roll according to the measured distance information.

[0048] The present occupancy detection system and unmanned warehouse tail roll occupancy detection method are based on the above steps. When placing the tail roll 4, the tail roll 4 is preferentially placed on the empty saddle 3 farthest from the rangefinder 1, and when the tail roll 4 on the saddle 3 is transferred out of the warehouse 100, the tail roll 4 close to the rangefinder 1 is preferentially transferred out first to ensure that the tail roll 4 is not placed at intervals, and to avoid the situation where the saddle 3 close to the rangefinder 1 has the tail roll 4 and the saddle 3 far from the rangefinder 1 is empty. In this way, after the rangefinder 1 feeds back the measured distance information to the PLC control device 5, and when there is a tail roll 4 on the saddle 3, the PL The C control device 5 can determine the position of the tail roll 4 closest to the rangefinder 1 based on the distance information, and determine that the saddle 3 closer to the rangefinder 1 than this position is empty, and the saddle 3 farther from the rangefinder 1 than this position has the tail roll 4, thereby determining the occupancy of the tail roll 4 on the saddle 3. When all the saddles 3 are empty, the PLC control device 5 will determine that the measured object is the reflector 2 based on the measured distance information, thereby determining that all the saddles 3 are empty, thereby realizing the detection of the occupancy of the tail roll; and in this way, the occupancy of the tail roll 4 can be accurately obtained, and the implementation method is simple.

[0049] In this embodiment, the method by which the PLC control device 5 determines the position occupancy of the tail roll according to the measured distance information is as follows:

[0050] All the saddles 3 along the extending direction of the detection light emitted by the rangefinder 1 are respectively the first saddle 31, the second saddle 32, ..., the Nth saddle, N is a positive integer, the first saddle 31 is closest to the rangefinder 1, and the distance between the first saddle 31 and the rangefinder 1 is A, and the width of the saddle 3 along the extending direction of the detection light emitted by the rangefinder 1 is B;

[0051] When the measured distance is [(A-B+B×n), (A+B×n)), the nth saddle to the Nth saddle is occupied by the tail roll 4, n is a positive integer, and 1≤n <N;

[0052] When the measured distance is [(A-B+B×N),(A+B×N)), then only the Nth saddle is occupied by the tail roll 4;

[0053] When the measured distance is greater than A+B×N, all the saddles 3 between the rangefinder 1 and the reflector 2 are not occupied.

[0054] In this embodiment, the PLC control device 5 is connected to the WMS system 7 for communication. The WMS system 7 includes a library map module, which includes the tail roll placeholder information of the library area 100. The PLC control device 5 sends the determined tail roll placeholder status to the WMS system 7, and the WMS system 7 updates the tail roll placeholder information of the library area 100 in the library map module according to the tail roll placeholder status determined by the PLC control device 5, thereby realizing real-time update of the tail roll placeholder information of the library area 100 in the WMS system 7.

[0055] The distance between the first saddle 31 and the rangefinder 1 is 110 cm, that is, A is 110 cm. In this embodiment, the width of the saddle 3 is specifically 80 cm, that is, B is 80 cm. In this embodiment, N is 50. Then when the laser rangefinder 11 measures a distance of 110 cm to 190 cm, it means that the tail roll 4 closest to the laser rangefinder 11 is located on the first saddle 31, which further indicates that the first saddle 31 to the fiftieth saddle are all occupied by the tail roll 4, and so on. When the distance measured by the laser rangefinder 11 is [(30+80×n), (110+80×n)), it means that the nth saddle to the fiftieth saddle are all occupied by the tail roll 4; when the distance measured by the laser rangefinder 11 is greater than 110+80×50=4110 cm, it means that there is no tail roll 4 on the fifty saddles 3.

[0056] like Figure 1 As shown, in this embodiment, the storage area 100 includes a sliding door 6, and the sliding door 6 includes a push-pull drive unit and a door body connected to the push-pull drive unit, and the push-pull drive unit is in communication connection with the PLC control device 5. In the process of transferring the tail roll 4 in the storage area 100, the operator inputs a door opening instruction through the operation interface of the WMS system 7, and the WMS system 7 sends a door opening signal to the PLC control device 5, and the PLC control device 5 controls the operation state of the push-pull drive unit to open the door body; the operator inputs a door closing instruction through the operation interface of the WMS system 7, and the WMS system 7 sends a door closing signal to the PLC control device 5, and the PLC control device 5 controls the operation state of the push-pull drive unit to close the door body. At the same time, in this embodiment, the PLC control device 5 is also in communication connection with the alarm light 8, and the PLC control device 5 controls the alarm light 8 to issue a door opening sound and light reminder while sending a door opening instruction to the push-pull drive unit; the PLC control device 5 controls the alarm light 8 to issue a door closing sound and light reminder while sending a door closing instruction to the push-pull drive unit.

[0057] In addition, the rangefinder 1 in this embodiment specifically adopts a laser rangefinder 11. The tail roll 4 in this embodiment is specifically a small tail roll. In this embodiment, a fixed bracket is installed at the top of the left side of the storage area 100, on which the above-mentioned laser rangefinder 11 is horizontally installed, and the installation height is 30 cm. The diameter of the small tail roll is generally 60 cm. The installation height of the laser rangefinder 11 roughly corresponds to the center of the small tail roll. The laser rangefinder 11 emits the laser to the other side of the storage area 100; the above-mentioned reflector 2 is installed at the same height at the top of the other side of the storage area 100. In this embodiment, the PLC control device 5 determines the occupancy of the small tail roll according to the feedback data of the laser rangefinder 11. The sliding door 6 of the storage area 100 in this embodiment can be opened or closed without the operation of the staff on site of the storage area 100. When opening the door, it opens from the end of the laser rangefinder 11 to the other end. A buzzer alarm light is installed next to the door, and the buzzer alarm light is the above-mentioned alarm light 8. After the PLC control device 5 located on the ground of the warehouse area 100 processes the data of the laser rangefinder 11, it sends the processed small tail roll occupancy information to the WMS system 7, receives the instructions of the WMS system 7, and remotely controls the opening and closing of the sliding door 6 and the lighting of the alarm light 8 on site. In this embodiment, the priority of the automatic lifting of the small tail roll by the crane is adjusted. The saddle 3 close to the reflector 2 has the highest priority, and the priority gradually decreases toward the laser rangefinder 11. When the small tail roll is automatically lifted, the small tail roll is first placed on the saddle 3 farthest from the laser rangefinder 11, and then placed in sequence. In the process of transferring the small tail roll out of the warehouse area 100, the small tail roll is forked out by a forklift, and the small tail roll is first forked out in sequence from the laser rangefinder 11 side until the forking is completed. In addition, in this embodiment, a fence 9 is provided at the edge of the warehouse area 100. The reflector 2 is mounted on the fence 9. The detection laser emitted by the laser rangefinder 11 will pass through the empty saddle 3 and hit the nearest tail roll 4, so that the PLC control device 5 can determine the occupancy of the tail roll 4 based on the data fed back by the laser rangefinder 11. After processing the data of the laser rangefinder 11, the PLC control device 5 sends the processed small tail roll occupancy information to the WMS system 7, and the WMS system 7 updates the tail roll occupancy information in its library map module in real time. According to the needs, program the PLC control device 5 and the WMS system 7, and perform corresponding debugging to verify the effect.

[0058] Specifically, when using a forklift to transport the small tail rolls, first, the forklift operator informs the main operator through the intercom, and the main operator inputs the door opening command through the operation interface of the WMS system 7, so that the sliding door 6 of the warehouse area 100 is automatically opened, and the alarm light 8 gives an audible and visual reminder of the door opening, and the forklift forks out the small tail rolls from the laser rangefinder 11 side in sequence. At this time, the distance measured by the laser rangefinder 11 will change as the small tail rolls are transported out in sequence, and the small tail roll position information processed by the PLC control device 5 will also change accordingly. The changed tail roll position information will be sent to the WMS system 7 in real time at a frequency of 50hz, and the warehouse map information of the WMS system 7 will also be updated accordingly. The warehouse map module of the WMS system 7 can display the position status of all saddles 3 through image simulation display, so as to facilitate the staff to intuitively understand the position status of the tail rolls. When the forklift completes the tail roll 4 transfer operation, the forklift operator informs the main operator through the intercom, and the main operator inputs the door closing command through the operation interface of the WMS system 7, so that the sliding door 6 is automatically closed. At the same time, the alarm light 8 gives an audible and visual reminder of the door closing, and the unmanned driving continues to perform the automatic lifting operation of the small tail roll according to the set priority order.

[0059] In this embodiment, the unmanned warehouse tail roll occupancy detection method utilizes the characteristics that all saddles 3 of the warehouse area 100 are arranged in high density and single row with long distance, and utilizes the characteristics that the unmanned driving can place the tail roll 4 in sequence, and adopts the laser rangefinder 11 to detect the distance of the nearest small tail roll, and calculates the small tail roll occupancy information by calculation. Based on the above-mentioned unmanned warehouse tail roll occupancy detection method, this embodiment realizes the detection and corresponding management of the tail roll occupancy situation of the warehouse area 100. The unmanned warehouse tail roll occupancy detection method and occupancy detection system in this embodiment can be applied to the field of metallurgical production technology, solves the problem that the warehouse location information of the small tail roll cannot be automatically tracked in real time due to the forklift unloading, affecting the safety of unmanned small tail roll lifting, ensures the real-time and accuracy of the small tail roll warehouse location information, and avoids the occurrence of abnormal situations such as small tail roll stacking due to personnel inventory errors, and the opening and closing of the door can also realize remote control, reduce the input of personnel in the unmanned warehouse area, realize the unmanned and automated warehouse area 100, and reduce the workload of human intervention in the unmanned area.

[0060] Compared with manual inventory and manual door opening and closing, the occupancy information obtained by the unmanned warehouse tail roll occupancy detection method in this embodiment is more accurate and reliable, and will not cause abnormal situations such as stacking of rolls due to negligence in human inventory, thus avoiding property losses, making door opening and closing safer, and eliminating the step of forklift operators getting off the vehicle to open and close the door, ensuring that forklift operations are simpler and safer. This unmanned warehouse tail roll occupancy detection method reduces the workload of the main operator, reduces the flow of personnel in the unmanned area, realizes the automatic circulation closed loop of small tail roll logistics information in the unmanned area, and truly realizes regional automation and unmanned operation.

[0061] In addition, today's laser rangefinder technology is changing with each passing day. According to investigations, there are laser rangefinders with a maximum measuring distance of 500m, an accuracy within ±5mm, and industrial laser rangefinders with a natural surface range (laser hitting ordinary objects) of 0.05-50m. Some models can even reach a natural surface range of 0.05-100m, and most of the small tail roll storage areas on site are within 50m, which provides some technical basis for the present invention.

[0062] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0063] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for detecting the occupancy of tail rolls in an unmanned warehouse area, characterized in that: A rangefinder (1) is provided at one end of a storage area (100), a reflector (2) is provided at the other end of the storage area (100), the rangefinder (1) faces the reflector (2), a plurality of saddles (3) of the storage area (100) are located between the rangefinder (1) and the reflector (2), and all the saddles (3) located between the rangefinder (1) and the reflector (2) are sequentially distributed along the extension direction of the detection light emitted by the rangefinder (1); the unmanned storage area tail roll occupancy detection method comprises the following steps: The tail roll (4) is transferred to the saddle (3) located between the rangefinder (1) and the reflector (2), and each time the tail roll (4) is transferred to the saddle (3) located between the rangefinder (1) and the reflector (2), the tail roll (4) needs to be placed on the empty saddle (3) farthest from the rangefinder (1); The tail roll (4) on the saddle (3) between the rangefinder (1) and the reflector (2) is rotated out from the storage area (100), and each time the tail roll (4) between the rangefinder (1) and the reflector (2) is rotated out, the tail roll (4) closest to the rangefinder (1) is selected to be rotated out; At the same time, the rangefinder (1) emits a detection light beam. When there is a tail roll (4) between the rangefinder (1) and the reflector (2), the detection light beam will be irradiated on the tail roll (4) closest to the rangefinder (1). At this time, the rangefinder (1) will measure the distance of the tail roll (4) closest to the rangefinder (1). When there is no tail roll (4) between the rangefinder (1) and the reflector (2), the detection light beam will be irradiated on the reflector (2). At this time, the rangefinder (1) will detect the distance between the reflector (2) and the rangefinder (1). The rangefinder (1) feeds back the measured distance information to the PLC control device (5). The PLC control device (5) determines the position of the tail roll according to the measured distance information.

2. The method for detecting the occupancy of tail rolls in an unmanned storage area according to claim 1, characterized in that: The method for the PLC control device (5) to determine the position occupancy of the tail roll according to the measured distance information is as follows: All the saddles (3) are respectively the first saddle (31), the second saddle (32), ..., the Nth saddle along the extension direction of the detection light emitted by the rangefinder (1), N is a positive integer, the first saddle (31) is closest to the rangefinder (1), and the distance between the first saddle (31) and the rangefinder (1) is A, and the width of the saddle (3) along the extension direction of the detection light emitted by the rangefinder (1) is B; When the measured distance is [(A-B+B×n), (A+B×n)), the nth saddle to the Nth saddle is occupied by the tail roll (4), n is a positive integer, and 1≤n <N; When the measured distance is [(A-B+B×N), (A+B×N)), only the Nth saddle is occupied by the tail roll (4); When the measured distance is greater than A+B×N, all the saddles (3) between the distance meter (1) and the reflector (2) are not occupied.

3. The method for detecting the occupancy of tail rolls in an unmanned storage area according to claim 1, characterized in that: The PLC control device (5) sends the determined tail roll occupancy status to the WMS system (7), the WMS system (7) comprising a library map module, the library map module containing the tail roll occupancy information of the library area (100), and the WMS system (7) updates the tail roll occupancy information of the library area (100) in the library map module according to the tail roll occupancy status determined by the PLC control device (5).

4. The method for detecting the occupancy of tail rolls in an unmanned storage area according to claim 1, characterized in that: The storage area (100) includes a sliding door (6), and the sliding door (6) includes a push-pull drive unit and a door body connected to the push-pull drive unit. The push-pull drive unit is in communication connection with a PLC control device (5), and the PLC control device (5) is in communication connection with a WMS system (7). In the process of transferring the tail roll (4) in the storage area (100), an operator inputs a door opening instruction through an operation interface of the WMS system (7), and the WMS system (7) sends a door opening signal to the PLC control device (5), and the PLC control device (5) controls the operation state of the push-pull drive unit to open the door body. The operator inputs a door closing instruction through the operation interface of the WMS system (7), and the WMS system (7) sends a door closing signal to the PLC control device (5), and the PLC control device (5) controls the operation state of the push-pull drive unit to close the door body.

5. The method for detecting the occupancy of tail rolls in an unmanned storage area according to claim 4, characterized in that: The PLC control device (5) is also in communication connection with the alarm light (8); when the PLC control device (5) sends a door opening instruction to the push-pull drive unit, the alarm light (8) is controlled to emit an audible and visual reminder for door opening; when the PLC control device (5) sends a door closing instruction to the push-pull drive unit, the alarm light (8) is controlled to emit an audible and visual reminder for door closing.

6. A place detection system for implementing the unmanned warehouse tail roll place detection method as claimed in claim 1, characterized in that: The invention comprises a rangefinder (1) arranged at one end of a storage area (100) and a reflector (2) arranged at the other end of the storage area (100), wherein the rangefinder (1) faces the reflector (2), a plurality of saddles (3) of the storage area (100) are located between the rangefinder (1) and the reflector (2), and all the saddles (3) located between the rangefinder (1) and the reflector (2) are sequentially distributed along the extension direction of the detection line emitted by the rangefinder (1), and the rangefinder (1) is communicatively connected to a PLC control device (5).

7. The occupancy detection system according to claim 6, characterized in that: The PLC control device (5) is in communication connection with a WMS system (7), and the WMS system (7) comprises a library map module, wherein the library map module contains the tail volume placeholder information of the library area (100).

8. The occupancy detection system according to claim 6, characterized in that: The storage area (100) is provided with a sliding door (6), the sliding door (6) comprising a sliding drive unit and a door body connected to the sliding drive unit, the sliding drive unit is communicatively connected to the PLC control device (5), the PLC control device (5) is communicatively connected to the WMS system (7), and the WMS system (7) comprises an operation interface.

9. The occupancy detection system according to claim 8, characterized in that: The PLC control device (5) is also in communication connection with the alarm light (8).

10. The occupancy detection system according to claim 6, characterized in that: The distance meter (1) adopts a laser distance meter (11).

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