Control device, determination system, and method of control

Abstract

To improve safety in a cargo handling operation.SOLUTION: A control device 10 includes: an input-output interface 13 for acquiring work information on a cargo handling operation from at least one sensor; and an operational device 11 for generating determination information for determining whether the cargo handling operation is safe on the basis of the work information that is acquired by the input-output interface 13.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a control device, a determination system, and a control method that generate information regarding the safety of loading and unloading operations using a lifting platform of a tailgate lifter. [Background technology]

[0002] Conventionally, there has been a loading / unloading operation monitoring system that manages loading and unloading operations (loading and / or unloading cargo from a transport device, hereinafter referred to as "loading and unloading operations") in transport devices such as trucks. For example, JP 2023-71582 A (Patent Document 1) discloses a technology for quantifying loading and unloading operations to improve work efficiency. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2023-71582 A Summary of the Invention [Problem to be solved by the invention]

[0004] The technology of JP 2023-71582 A (Patent Document 1) can improve the work efficiency of loading and unloading work. However, there is room for improvement in loading and unloading work not only in terms of work efficiency but also in terms of safety.

[0005] The present disclosure has been made to solve such problems, and its purpose is to improve the safety of loading and unloading operations. [Means for solving the problem]

[0006] The present disclosure relates to a control device that generates information related to the safety of a loading and unloading operation using a lifting platform of a tailgate lifter. The control device includes an acquisition unit that acquires operation information related to the loading and unloading operation from at least one sensor, and a calculation unit that generates determination information for determining whether the loading and unloading operation is safe or not, based on the operation information acquired by the acquisition unit.

[0007] The present disclosure relates to a judgment system for judging the safety of a loading and unloading operation using a lifting platform of a tailgate lifter. The judgment system includes at least one sensor that acquires work information related to the loading and unloading operation, a control device that generates judgment information for judging whether the loading and unloading operation is safe or not based on the work information, and a judgment device that judges whether the loading and unloading operation is safe or not based on the judgment information acquired from the control device. The control device includes an acquisition unit that acquires the work information related to the loading and unloading operation from the at least one sensor, and a calculation unit that generates the judgment information based on the work information acquired by the acquisition unit.

[0008] The present disclosure relates to a control method for generating, by a computer, information regarding the safety of a loading / unloading operation using a lifting platform of a tailgate lifter. The control method includes, as processing executed by the computer, a step of acquiring operation information regarding the loading / unloading operation from at least one sensor, and a step of generating determination information for determining whether the loading / unloading operation is safe or not, based on the operation information acquired by the acquiring step. Effect of the Invention

[0009] According to the present disclosure, a user can generate judgment information for determining whether or not loading and unloading work is safe based on work information regarding the loading and unloading work acquired by at least one sensor, and thus can improve the safety of the loading and unloading work by using the judgment information. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing a transportation device equipped with a tailgate lifter. [Diagram 2] 11A and 11B are diagrams showing a usage state of the lifting platform of the tailgate lifter. [Diagram 3] FIG. 2 is a block diagram showing a configuration of a determination system. [Figure 4] 1 is a diagram for explaining sensors used, sensing contents, and sensor installation positions. FIG. [Diagram 5] FIG. 13 is a diagram for explaining an example of confirmation items for loading and unloading work. [Figure 6] 13 is a flowchart showing a process for generating determination information for confirmation item No. 1. [Figure 7] 13 is a flowchart showing a process for generating determination information for confirmation item No. 2. [Figure 8] 13 is a flowchart showing a process for generating determination information for confirmation item No. 3. [Figure 9] 13 is a flowchart showing a process for generating determination information for confirmation item No. 4. [Figure 10] 13 is a flowchart showing a process for generating determination information for confirmation item No. 5. [Figure 11] 13 is a flowchart showing a process for generating determination information for confirmation item No. 6. [Figure 12] 13 is a flowchart showing a process for generating determination information for confirmation item No. 7. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the drawings. In the embodiments described below, when numbers, amounts, etc. are mentioned, the scope of the present disclosure is not necessarily limited to the numbers, amounts, etc., unless otherwise specified. The same reference numbers are given to the same parts and corresponding parts, and duplicate descriptions may not be repeated. It is intended from the beginning that the configurations in the embodiments will be used in appropriate combination.

[0012] 1 is a diagram showing a transport equipment 100 equipped with a tailgate lifter 102. The transport equipment 100 is, for example, a truck equipped with a loading platform 101 and a tailgate lifter 102. The tailgate lifter 102 includes a lifting platform 103, a cylinder 105, and a hydraulic device 106.

[0013] The tailgate lifter 102 is provided integrally with the rear of the loading platform 101 and drives a lift platform 103, which has been tilted from an upright position to a horizontal position, to rise and fall between the ground level at its lower end and the height of the loading platform 101 at its upper end. The cylinder 105 is attached to the lift platform 103 and operates hydraulically. The hydraulic device 106 is a device for driving the cylinder 105.

[0014] The hydraulic device 106 includes a motor, a drive circuit for driving the motor, a pump driven by the motor, piping through which hydraulic fluid (hydraulic oil) discharged from the pump flows, a valve for controlling the flow of the hydraulic fluid, and a tank for storing the hydraulic fluid. A battery that is mounted on the transportation equipment 100 and is used for driving the transportation equipment 100 is used as a power source for driving the motor.

[0015] A plurality of sensors are attached to the tailgate lifter 102 to measure work information related to various loading and unloading operations. For example, the plurality of sensors include a pressure sensor 31, a voltage sensor 33, and an inclination sensor 34. The pressure sensor 31 is a sensor for measuring the pressure of the cylinder 105. The pressure sensor 31 is, for example, attached directly to the cylinder 105. The position of the pressure sensor 31 may be arranged at another position as long as it is a position where the pressure of the cylinder 105 can be measured.

[0016] The voltage sensor 33 is a sensor for measuring voltage information of an operation switch 107, which will be described later and is used to operate the drive of the lifting platform 103. The voltage sensor 33 is arranged, for example, inside the housing of the hydraulic device 106. The inclination sensor 34 is a sensor for measuring the inclination of the lifting platform 103. The inclination sensor 34 is arranged, for example, on the back side of the lifting platform 103. When the inclination sensor 34 is arranged on the back side of the lifting platform 103, the angle of the lifting platform 103 can be detected. The inclination sensor 34 may be attached to an arm extending from a cylinder 105 that lifts the lifting platform 103. When the inclination sensor 34 is attached to the arm, the height of the lifting platform 103 can also be estimated from the angle of the arm.

[0017] Next, a usage state when the lifting platform 103 of the tailgate lifter 102 is operated will be described. Fig. 2 is a diagram showing a usage state of the lifting platform 103 of the tailgate lifter 102. An operator moves the lifting platform 103 of the tailgate lifter 102 up and down by operating an operation switch 107. The operation switch 107 is connected to the hydraulic device 106 by a cable.

[0018] During loading and unloading work, the worker opens the door 101a of the loading platform 101 of the transport equipment 100, loads the baggage 20 loaded on the cart onto the lifting platform 103, and operates the operation switch 107 to move the lifting platform 103 upward or downward. The lifting platform 103 is provided with a movable stopper 103a and fixed stoppers 103b provided on both sides of the lifting platform 103. The stopper 103a is spring-type, and when the worker steps on it with his / her foot, it protrudes from the lifting platform 103, and when the worker steps on it again, it can be stored inside the lifting platform 103.

[0019] A proximity sensor 32 for measuring the state of the stopper 103a is provided inside the lift platform 103. The proximity sensor 32 can detect whether the stopper 103a is protruding from the lift platform 103 or is stored in the lift platform 103. The proximity sensor 32 may directly detect the state of the stopper 103a, or may detect the state of a detection object (such as a metal piece) attached to the stopper 103a.

[0020] A camera 35 is disposed at the upper rear of the loading platform 101. The camera 35 is capable of capturing an image of the baggage 20 on the lift platform 103. The camera 35 is also capable of capturing an image of the lift platform 103 and a worker performing loading and unloading work. A plurality of cameras 35 may be provided, and the camera 35 may be provided at any position, such as the baggage 20 or the lift platform 103, as long as it is capable of capturing an image of the worker.

[0021] Next, a configuration of the determination system 1000 of this embodiment will be described. Fig. 3 is a block diagram showing the configuration of the determination system 1000. The determination system 1000 includes a monitoring device 1, a communication network 4, and a server device 2. The monitoring device 1 includes a control device 10 and at least one sensor that measures work information related to various loading and unloading operations.

[0022] The control device 10 includes a calculation device 11, a memory 12, an input / output interface 13, a communication interface 14, and a storage device 15. These components are connected via a bus.

[0023] The arithmetic device 11 is a computing entity (computer) that executes a predetermined process. The arithmetic device 11 is configured with a processor such as a CPU (Central Processing Unit), an MPU (Micro-Processing Unit), a TPU (Tensor Processing Unit), or a GPU (Graphics Processing Unit). Note that a processor, which is an example of the arithmetic device 11, has a function of executing a predetermined process by executing a predetermined program, but some or all of these functions may be implemented using a dedicated hardware circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field-Programmable Gate Array). The term "processor" is not limited to a processor in the narrow sense that executes a process in a stored program manner such as a CPU, an MPU, a TPU, or a GPU, but may include a hardwired circuit such as an ASIC or an FPGA. The arithmetic device 11 is not limited to a von Neumann type computer such as a CPU or a GPU, and may be configured with a non-von Neumann type computer such as a quantum computer or an optical computer. The arithmetic device 11 as described above can also be read as a processing circuitry that executes a predetermined process. The computing device 11 may be configured as one chip or multiple chips. Furthermore, the processor and related processing circuits may be configured as multiple computers interconnected by wire or wirelessly via a local area network or a wireless network. The processor and related processing circuits may be configured as a cloud computer that performs remote calculations based on input data and outputs the results of the calculations to another device in a remote location.

[0024] The memory 12 includes a storage area (for example, a working area) for storing program codes or work memories when the arithmetic unit 11 executes various programs. Examples of the memory 12 include volatile memories such as DRAM and SRAM, and non-volatile memories such as ROM and flash memory.

[0025] The input / output interface 13 receives input signals from an operator such as an operation switch 107. The input / output interface 13 acquires work information related to the loading and unloading work from acquisition units such as a pressure sensor 31, a proximity sensor 32, a voltage sensor 33, a tilt sensor 34, and a camera 35.

[0026] The communication interface 14 transmits and receives data (information) to and from other devices via a wired connection or a wireless connection. In the present embodiment, the communication interface 14 transmits and receives data (information) to and from the server device 2 via wireless communication via the communication network 4.

[0027] The storage device 15 stores various programs or various data executed by the arithmetic device 11. For example, the storage device 15 stores a program for executing a process of generating judgment information for judging whether or not the loading and unloading work executed by the arithmetic device 11 is safe. The storage device 15 also stores weight conversion data 151 for converting pressure into weight, voltage data 152 corresponding to the operation switch 107, and the like. The storage device 15 may be one or more non-transitory computer readable mediums, or may be one or more computer readable storage mediums. Examples of the storage device 15 include a hard disk drive (HDD) and a solid state drive (SSD).

[0028] The server device 2 is connected to the monitoring device 1 via a communication network 4 such as the Internet. Here, the calculation device 11 generates judgment information for judging whether or not the loading and unloading work is safe based on work information related to the loading and unloading work from multiple sensors. The calculation device 11 judges whether or not the loading and unloading work is safe based on the judgment information. The judgment result of whether or not the loading and unloading work is safe, which is judged by the calculation device 11, is output from the communication interface 14 to the server device 2, which is an external device.

[0029] Note that, instead of the judgment result, judgment information generated by the arithmetic device 11 may be output from the communication interface 14 to the server device 2, which is an external device. When the judgment information is transmitted to the server device 2, the server device 2 may function as a judgment device that judges whether or not the loading and unloading operation is safe.

[0030] Next, a detailed description will be given of a plurality of sensors that measure work information related to a cargo handling work using the lifting platform 103 of the tailgate lifter 102. Fig. 4 is a diagram for explaining the sensors used, the sensing contents, and the mounting positions of the sensors.

[0031] As shown in FIG. 4, the pressure sensor 31 is a sensor that detects the presence or absence of luggage 20 on the lift platform 103. The pressure sensor 31 may be arranged at another position as long as it is a place where the pressure of the cylinder 105 can be measured. The computing device 11 converts the measurement value of the pressure sensor 31 into weight using weight conversion data 151 stored in the storage device 15. Note that a weight sensor such as a load cell may be arranged on the lift platform 103 instead of the pressure sensor 31, and the presence or absence of luggage 20 on the lift platform 103 may be detected using the weight sensor. The weight sensor may be a mat-type weight sensor that can detect the weight of each area on the lift platform 103.

[0032] 4, the pressure sensor 31 also functions as a sensor that detects shaking of the platform 103. The computing device 11 detects a change in the pressure sensor 31, and detects that shaking has occurred in the platform 103 when the change in the detected value is different from normal. Note that an acceleration sensor may be installed in the platform 103 instead of the pressure sensor 31, and shaking of the platform 103 may be detected based on a change in the acceleration sensor value.

[0033] 4, the proximity sensor 32 is a sensor that detects the protruding state and the retracted state of the stopper 103a. The proximity sensor 32 is disposed inside the lift platform 103. The proximity sensor 32 may be a sensor that directly detects the state of the stopper 103a, or a sensor that detects the state of a detection object (such as a metal piece) attached to the stopper 103a.

[0034] As shown in Fig. 4, the voltage sensor 33 is a sensor for detecting the vertical movement of the lifting platform 103. The computing device 11 detects operation information from the operation switch 107 from the voltage. There are multiple types of operation switches 107 depending on the model, etc., and voltage data 152 corresponding to the type is stored in the storage device 15 shown in Fig. 3. The vertical movement of the lifting platform 103 may be detected by measuring the voltage applied to a valve (solenoid valve) provided in the hydraulic device 106.

[0035] Instead of the voltage sensor 33, an inclination sensor 34 that measures the inclination of the lift platform 103 may be installed on the cylinder 105, and the inclination sensor may be used to detect the vertical movement of the lift platform 103. When the inclination sensor 34 is used, data indicating the correspondence between the inclination angle and height is stored in the storage device 15, and the vertical movement of the lift platform 103 may be detected from information on the height corresponding to the inclination angle. Instead of the voltage sensor 33, an acceleration sensor may be installed on the lift platform 103, and the vertical movement of the lift platform 103 may be detected from changes in the acceleration sensor value.

[0036] 4, the inclination sensor 34 is a sensor for detecting the inclination of the lift platform 103. The inclination sensor 34 is attached to the lift platform 103 and can detect that the baggage 20 has been placed on the lift platform 103 or the inclination of the lift platform 103 when the baggage 20 is placed on the lift platform 103.

[0037] 4, the camera 35 is a sensor for detecting the position of the baggage 20 and the position of the worker. The camera 35 is attached to a high position on the rear of the vehicle body of the truck, which is the transportation equipment 100.

[0038] Next, an example of check items for loading and unloading work will be described. Loading and unloading work has a number of check items related to safety. Fig. 5 is a diagram for explaining an example of check items for loading and unloading work. The calculation device 11 generates judgment information corresponding to the check items for generating judgment information for judging whether loading and unloading work is safe or not, based on work information related to loading and unloading work from the sensor.

[0039] As shown in FIG. 5, the check item No. 1 is an item as to whether or not the stopper 103a protrudes while the luggage 20 is moving. By the check item No. 1, it can be determined that it is safe if the stopper 103a protrudes from the lift platform 103 while the platform 103 on which the luggage 20 is placed is moving up and down, and that caution is required if the stopper 103a is stored in the lift platform 103. The check item No. 2 is an item as to whether or not the lift platform 103 is tilted while the luggage 20 is moving (or stopped at a position other than the lowest end). By the check item No. 2, it can be determined that it is safe if the lift platform 103 is not tilted while the platform 103 on which the luggage 20 is placed is moving up and down, and that caution is required if the platform 103 is tilted. Note that it may be determined by the check item No. 2 that it is safe if the lift platform 103 is not tilted while the luggage 20 is stopped at a position other than the lowest end, and that caution is required if the lift platform 103 is tilted while stopped at a position other than the lowest end.

[0040] The check item No. 3 is an item as to whether or not the platform 103 is shaking while the luggage 20 is moving. By using the check item No. 3, it can be determined that it is safe if the platform 103 is not shaking while the platform 103 with the luggage 20 loaded thereon is moving up and down, and that caution is required if the platform 103 is shaking. The check item No. 4 is an item as to whether or not there is contact with the platform 103 while the luggage 20 is moving. By using the check item No. 4, it can be determined that it is safe if there is no contact with the platform 103 while the luggage 20 is moving up and down, and that caution is required if there is contact.

[0041] The check item No. 5 is whether the weight changes before and after stopping during lifting or lowering. Here, during the loading and unloading of the luggage 20, the tailgate lifter 102 stops temporarily between the ground and the loading platform. This action is performed so that the worker can get on and off after the temporary stop. Specifically, when loading the luggage 20, the worker places the luggage 20 on the lifting platform 103 and raises the lifting platform 103 halfway. Next, after checking safety, the worker gets on the lifting platform 103 and moves together with the luggage 20 to the height of the loading platform 101. After that, the worker moves the luggage 20 into the loading platform 101.

[0042] When unloading the luggage 20, the worker moves the luggage 20 from inside the loading platform 101 to the lifting platform 103, and lowers the lifting platform 103 halfway without getting on it. Next, after confirming safety, the worker gets on the lifting platform 103 and moves together with the luggage 20 to the ground. After that, the worker unloads the luggage 20 from the lifting platform 103. In this way, when the lifting platform 103 stops between the loading platform 101 and the ground, the worker gets on the lifting platform 103 and moves together with the luggage 20, so that the luggage 20 can be prevented from starting to move during the movement. According to the confirmation item No. 5, it can be determined that it is safe if the weight of the object on the lifting platform 103 changes while the lifting platform 103 on which the luggage 20 is loaded is moving up and down, and that caution is required if the weight of the object on the lifting platform 103 is not changed. It is also possible that the worker does not touch the luggage 20 at all during the lifting and lowering of the luggage 20.

[0043] The check item No. 6 is an item as to whether or not the stopper 103a is stored during the work of unloading (loading) the luggage 20. Through the check item No. 6, it can be determined that if the stopper 103a is stored in the platform 103 during the work of unloading the luggage 20 from the platform 103, the luggage 20 will not get caught on the stopper 103a and it is safe, and if it protrudes, caution is required. It can also be determined through the check item No. 6 that during the work of loading the luggage 20 onto the platform 103, if the stopper 103a protrudes from the platform 103, the luggage 20 will be stopped by the stopper 103a even if it moves and it is safe, and if it is stored, caution is required.

[0044] The confirmation item No. 7 is an item as to whether or not the luggage 20 protrudes from the platform 103, and whether or not the distance between the worker and the platform 103 exceeds a predetermined range. The confirmation item No. 7 makes it possible to determine that it is safe if the luggage 20 does not protrude from the platform 103, and that caution is required if the luggage 20 protrudes from the platform 103. The confirmation item No. 7 can also determine that it is safe if the distance between the platform 103 and the worker exceeds a predetermined range, and that caution is required if the distance between the platform 103 and the worker does not exceed the predetermined range (if the distance between the platform 103 and the worker is close).

[0045] Next, the process of generating judgment information corresponding to the check item executed by the calculation device 11 will be described. In the following, each step in the flowchart will be simply denoted as "S". The calculation device 11 executes a control program stored in the storage device 15 to execute the process of the flowchart shown in FIG. 6 (and FIGS. 7 to 12 described later). Each process of the flowchart is repeatedly called and executed as a subroutine from a main routine in the control of the calculation device 11. First, the process of generating judgment information for check item No. 1 executed by the calculation device 11 will be described. FIG. 6 is a flowchart showing the process of generating judgment information for check item No. 1.

[0046] As shown in Fig. 6, the arithmetic device 11 first detects the presence or absence of luggage 20 on the platform 103 from the value of the pressure sensor 31 (S11). Next, the arithmetic device 11 determines whether or not there is luggage 20 on the platform 103 from the information of S11 (S12). If the arithmetic device 11 determines in S12 that there is no luggage 20 on the platform 103 (NO in S12), it returns the process from the subroutine to the main routine. If the arithmetic device 11 determines in S12 that there is luggage 20 on the platform 103 (YES in S12), it proceeds to the process of S13.

[0047] In S13, the arithmetic device 11 detects the vertical movement of the platform 103 from the value of the voltage sensor 33. Next, the arithmetic device 11 determines whether the platform 103 is operating or not from the information of S13 (S14). If the arithmetic device 11 determines in S14 that the platform 103 is not operating (NO in S14), it returns the process from the subroutine to the main routine. If the arithmetic device 11 determines in S14 that the platform 103 is operating (YES in S14), it proceeds to the process of S15.

[0048] In S15, the arithmetic device 11 detects whether the stopper 103a is in a protruding state or in a retracted state from the value of the proximity sensor 32. Next, the arithmetic device 11 determines whether the stopper 103a is protruding or not from the information of S15 (S16). When the arithmetic device 11 determines in S16 that the stopper 103a is protruding (YES in S16), it generates safety information indicating that the loading and unloading work is being performed safely (S17). When the arithmetic device 11 determines in S16 that the stopper 103a is not protruding (NO in S16), it generates caution information indicating that the loading and unloading work is not being performed safely (S18). Next, the arithmetic device 11 outputs the safety information or caution information (S19) and returns the process from the subroutine to the main routine. The output various information can be displayed on a display or accumulated and stored in a cloud server.

[0049] The arithmetic device 11 acquires work information related to the loading and unloading work from the pressure sensor 31, the voltage sensor 33, and the proximity sensor 32 via the input / output interface 13. Based on the acquired work information, the arithmetic device 11 generates judgment information for judging whether the loading and unloading work is safe or not by the process shown in Fig. 6. Specifically, the judgment information is safety information when the stopper 103a protrudes from the lifting platform 103 while the lifting platform 103 on which the baggage 20 is placed is moving up and down, or caution information when the stopper 103a does not protrude. By using the generated judgment information, the safety of the loading and unloading work for the No. 1 check item can be improved.

[0050] Next, the process of generating the determination information for the check item No. 2 executed by the arithmetic device 11 will be described. FIG. 7 is a flowchart showing the process of generating the determination information for the check item No. 2. As shown in FIG. 7, the arithmetic device 11 first detects the presence or absence of the baggage 20 on the platform 103 from the value of the pressure sensor 31 (S21). Next, the arithmetic device 11 determines whether or not the baggage 20 is on the platform 103 from the information of S21 (S22). If the arithmetic device 11 determines in S22 that the baggage 20 is not on the platform 103 (NO in S22), it returns the process from the subroutine to the main routine. If the arithmetic device 11 determines in S22 that the baggage 20 is on the platform 103 (YES in S22), it proceeds to the process of S23.

[0051] In S23, the arithmetic device 11 detects the vertical movement of the platform 103 from the value of the voltage sensor 33. Next, the arithmetic device 11 determines whether the platform 103 is operating or not from the information of S23 (S24). If the arithmetic device 11 determines in S24 that the platform 103 is not operating (NO in S24), it returns the process from the subroutine to the main routine. If the arithmetic device 11 determines in S24 that the platform 103 is operating (YES in S24), it proceeds to the process of S25.

[0052] In addition, in the process of S23, the calculation device 11 can also detect from the change in voltage that the platform 103 is stopped at a position other than the lowest end. In this case, if the calculation device 11 determines from the change in voltage in the process of S24 that the platform 103 is not stopped at a position other than the lowest end (NO in S24), the process returns from the subroutine to the main routine. If the calculation device 11 determines in S24 that the platform 103 is stopped at a position other than the lowest end (YES in S24), the process proceeds to S25.

[0053] In S25, the arithmetic device 11 detects the inclination of the platform 103 from the value of the inclination sensor 34. Next, the arithmetic device 11 determines whether the platform 103 is inclined beyond a preset threshold from the information of S25 (S26). When the arithmetic device 11 determines in S26 that the platform 103 is not inclined beyond the preset threshold (YES in S26), it generates safety information indicating that the loading and unloading work is being performed safely (S27). When the arithmetic device 11 determines in S26 that the platform 103 is inclined beyond the preset threshold (NO in S26), it generates caution information indicating that the loading and unloading work is not being performed safely (S28). Next, the arithmetic device 11 outputs the safety information or caution information (S29) and returns the process from the subroutine to the main routine.

[0054] The arithmetic device 11 acquires work information related to the loading and unloading work from the pressure sensor 31, the voltage sensor 33, and the tilt sensor 34 via the input / output interface 13. Based on the acquired work information, the arithmetic device 11 generates judgment information for judging whether the loading and unloading work is safe or not by the process shown in Fig. 7. Specifically, the judgment information is safety information in the case where the lifting platform 103 on which the baggage 20 is placed is not tilted beyond a preset threshold while the lifting platform 103 is moving up and down, or caution information in the case where the lifting platform 103 is tilted beyond a preset threshold. By using the generated judgment information, the safety of the loading and unloading work for the check item No. 2 can be improved.

[0055] The arithmetic device 11 can generate, as the judgment information, safety information in the case where the platform 103 on which the baggage 20 is placed is not tilted beyond a preset threshold value when the platform 103 is stopped at a position other than the lowest end, or caution information in the case where the platform 103 is tilted beyond a preset threshold value. A worker may stop the platform 103 at a position other than the lowest end during loading and unloading work. For this reason, it is safe when the platform 103 is not tilted beyond a preset threshold value when stopped midway, and caution is required when the platform 103 is tilted beyond a preset threshold value. By using the generated judgment information, it is possible to improve the safety of loading and unloading work when the platform 103 is stopped at a position other than the lowest end.

[0056] Next, the process of generating the determination information for the check item No. 3 executed by the arithmetic device 11 will be described. FIG. 8 is a flowchart showing the process of generating the determination information for the check item No. 3. As shown in FIG. 8, the arithmetic device 11 first detects the presence or absence of the baggage 20 on the platform 103 from the value of the pressure sensor 31 (S31). Next, the arithmetic device 11 determines whether or not the baggage 20 is on the platform 103 from the information of S31 (S32). If the arithmetic device 11 determines in S32 that the baggage 20 is not on the platform 103 (NO in S32), it returns the process from the subroutine to the main routine. If the arithmetic device 11 determines in S32 that the baggage 20 is on the platform 103 (YES in S32), it proceeds to the process of S33.

[0057] In S33, the arithmetic device 11 detects the vertical movement of the lift platform 103 from the value of the voltage sensor 33. Next, the arithmetic device 11 determines whether the lift platform 103 is operating or not from the information of S33 (S34). If the arithmetic device 11 determines in S34 that the lift platform 103 is not operating (NO in S34), it returns the process from the subroutine to the main routine. If the arithmetic device 11 determines in S34 that the lift platform 103 is operating (YES in S34), it proceeds to the process of S35.

[0058] In S35, the arithmetic device 11 detects the shaking of the platform 103 from the value of the pressure sensor 31. Next, the arithmetic device 11 judges whether the platform 103 is shaking or not from the information of S35 (S36). When the arithmetic device 11 judges that the platform 103 is not shaking in S36 (YES in S36), it generates safety information indicating that the loading and unloading work is being performed safely (S37). When the arithmetic device 11 judges that the platform 103 is shaking in S36 (NO in S36), it generates caution information indicating that the loading and unloading work is not being performed safely (S38). Next, the arithmetic device 11 outputs the safety information or caution information (S39) and returns the process from the subroutine to the main routine.

[0059] The arithmetic device 11 acquires work information related to the loading and unloading work from the pressure sensor 31 and the voltage sensor 33 via the input / output interface 13. Based on the acquired work information, the arithmetic device 11 generates judgment information for judging whether the loading and unloading work is safe or not by the process shown in Fig. 8. Specifically, the judgment information is safety information in the case where the platform 103 on which the baggage 20 is placed is not shaking while the platform 103 is moving up and down, or caution information in the case where the platform 103 is shaking. By using the generated judgment information, the safety of the loading and unloading work for the check item No. 3 can be improved.

[0060] Next, the process of generating the determination information for check item No. 4 executed by the arithmetic device 11 will be described. FIG. 9 is a flowchart showing the process of generating the determination information for check item No. 4. As shown in FIG. 9, the arithmetic device 11 first detects the presence or absence of the baggage 20 on the platform 103 from the value of the pressure sensor 31 (S41). Next, the arithmetic device 11 determines whether or not the baggage 20 is on the platform 103 from the information of S41 (S42). If the arithmetic device 11 determines in S42 that the baggage 20 is not on the platform 103 (NO in S42), it returns the process from the subroutine to the main routine. If the arithmetic device 11 determines in S42 that the baggage 20 is on the platform 103 (YES in S42), it proceeds to the process of S43.

[0061] In S43, the arithmetic device 11 detects the vertical movement of the platform 103 from the value of the voltage sensor 33. Next, the arithmetic device 11 determines whether the platform 103 is operating or not from the information of S43 (S44). If the arithmetic device 11 determines in S44 that the platform 103 is not operating (NO in S44), it returns the process from the subroutine to the main routine. If the arithmetic device 11 determines in S44 that the platform 103 is operating (YES in S44), it proceeds to the process of S45.

[0062] The arithmetic device 11 detects contact with the platform 103 from the value of the pressure sensor 31 in S45. The value of the pressure sensor 31 changes instantaneously due to contact of an object or the like with the platform 103. The arithmetic device 11 can detect contact with the platform 103 from the instantaneous change in the value of the pressure sensor 31. Next, the arithmetic device 11 determines whether or not there has been contact with the platform 103 from the information of S45 (S46). If the arithmetic device 11 determines in S46 that there has been no contact with the platform 103 (YES in S46), it generates safety information indicating that the loading and unloading work is being performed safely (S47). If the arithmetic device 11 determines in S46 that there has been contact with the platform 103 (NO in S46), it generates caution information indicating that the loading and unloading work is not being performed safely (S48). Next, the arithmetic device 11 outputs the safety information or caution information (S49) and returns the process from the subroutine to the main routine.

[0063] The arithmetic device 11 acquires work information related to the loading and unloading work from the pressure sensor 31 and the voltage sensor 33 via the input / output interface 13. Based on the acquired work information, the arithmetic device 11 generates judgment information for judging whether the loading and unloading work is safe or not by the process shown in Fig. 9. Specifically, the judgment information is safety information in the case where there is no contact with the platform 103 while the platform 103 on which the baggage 20 is placed is moving up and down, or caution information in the case where there is contact. By using the generated judgment information, it is possible to improve the safety of the loading and unloading work for the check item No. 4.

[0064] Next, the process of generating the determination information for the check item No. 5 executed by the arithmetic device 11 will be described. FIG. 10 is a flowchart showing the process of generating the determination information for the check item No. 5. As shown in FIG. 10, the arithmetic device 11 first detects the presence or absence of the baggage 20 on the platform 103 from the value of the pressure sensor 31 (S51). Next, the arithmetic device 11 determines whether or not the baggage 20 is on the platform 103 from the information of S51 (S52). If the arithmetic device 11 determines in S52 that the baggage 20 is not on the platform 103 (NO in S52), the process returns from the subroutine to the main routine. If the arithmetic device 11 determines in S52 that the baggage 20 is on the platform 103 (YES in S52), the process proceeds to S53.

[0065] In S53, the arithmetic device 11 detects the vertical movement of the platform 103 from the value of the voltage sensor 33. Next, the arithmetic device 11 determines whether the platform 103 is operating or not from the information of S53 (S54). If the arithmetic device 11 determines in S54 that the platform 103 is not operating (NO in S54), it returns the process from the subroutine to the main routine. If the arithmetic device 11 determines in S54 that the platform 103 is operating (YES in S54), it proceeds to the process of S55.

[0066] In S55, the arithmetic device 11 detects a change in the weight of the object on the platform 103 during its ascent or descent from a change in the value of the pressure sensor 31. The value of the pressure sensor 31 changes when a worker gets on or off the platform 103. When appropriate loading and unloading work is being performed, the value of the pressure sensor 31 changes when a worker gets on the platform 103 when the platform 103 is stopped. The arithmetic device 11 can detect a change in the weight of the object on the platform 103 from a change in the value of the pressure sensor 31.

[0067] Next, the arithmetic device 11 determines whether or not there has been a change in weight on the platform 103 from the information in S55 (S56). If the arithmetic device 11 determines in S56 that there has been a change in weight of the object on the platform 103 (YES in S56), it generates safety information indicating that the loading and unloading work is being performed safely (S57). If the arithmetic device 11 determines in S56 that there has been no change in weight of the object on the platform 103 (NO in S56), it generates caution information indicating that the loading and unloading work is not being performed safely (S58). Next, the arithmetic device 11 outputs the safety information or caution information (S59), and returns the process from the subroutine to the main routine.

[0068] The arithmetic device 11 acquires work information related to the loading and unloading work from the pressure sensor 31 and the voltage sensor 33 via the input / output interface 13. Based on the acquired work information, the arithmetic device 11 generates judgment information for judging whether the loading and unloading work is safe or not by the process shown in Fig. 10. Specifically, the judgment information is safety information indicating that the weight of the object on the platform 103 has changed while the platform 103 on which the baggage 20 is placed is moving up and down, or caution information indicating that the weight of the object on the platform 103 has not changed. By using the generated judgment information, the safety of the loading and unloading work for the check item No. 5 can be improved.

[0069] Next, the process of generating the judgment information for the check item No. 6 executed by the arithmetic device 11 will be described. FIG. 11 is a flowchart showing the process of generating the judgment information for the check item No. 6. As shown in FIG. 11, the arithmetic device 11 first detects the operation of unloading (loading) the luggage 20 from a change in the value of the pressure sensor 31 (S61). For example, when the platform 103 is in contact with the ground, the pressure of the cylinder 105 is almost 0. If the pressure of the cylinder 105 subsequently changes to a pressure in which the luggage 20 is not loaded, the arithmetic device 11 can determine that the operation of unloading the luggage 20 has been performed. The arithmetic device 11 can also detect the operation of loading the luggage 20 from a change in the value of the pressure sensor 31. For example, when the platform 103 is raised to the top end, the pressure of the cylinder 105 is almost the maximum value. If the pressure of the cylinder 105 subsequently changes to a pressure in which the luggage 20 is loaded, the arithmetic device 11 can determine that the luggage 20 has been loaded onto the platform 103. The value of the pressure sensor 31 is stored for each time period.

[0070] Next, the calculation device 11 determines whether or not there was an operation to unload (load) the luggage 20 from the information of S61 (S62). If the calculation device 11 determines in S62 that there was no operation to unload (load) the luggage 20 (NO in S62), the calculation device 11 returns the process from the subroutine to the main routine. If the calculation device 11 determines in S62 that there was an operation to unload (load) the luggage 20 (YES in S62), the calculation device 11 proceeds to the process of S63.

[0071] Next, the arithmetic device 11 detects whether the stopper 103a was in a protruding state or in a stored state from the value of the proximity sensor 32 during the work of unloading (loading) the luggage 20 in S63. The value of the proximity sensor 32 is stored for each time. The arithmetic device 11 determines whether the stopper 103a was stored (protruding) or not from the information of S63 (S64). When the arithmetic device 11 determines that the stopper 103a was stored in S64 during the work of unloading the luggage 20 (YES in S64), it generates safety information indicating that the loading and unloading work is being performed safely (S67). When the arithmetic device 11 determines that the stopper 103a was protruding in S64 during the work of unloading the luggage 20 (NO in S64), it generates caution information indicating that the loading and unloading work is not being performed safely (S68). Next, the arithmetic device 11 outputs the safety information or caution information (S69) and returns the process from the subroutine to the main routine.

[0072] If the calculation device 11 determines in S64 that the stopper 103a is protruding during the loading of the luggage 20 (YES in S64), it generates safety information indicating that the loading and unloading operation is being performed safely (S67). If the calculation device 11 determines in S64 that the stopper 103a is retracted during the loading of the luggage 20 (NO in S64), it generates caution information indicating that the loading and unloading operation is not being performed safely (S68). Next, the calculation device 11 outputs the safety information or caution information (S69) and returns the process from the subroutine to the main routine.

[0073] The arithmetic device 11 acquires work information related to the loading and unloading work from the pressure sensor 31 and the proximity sensor 32 via the input / output interface 13. The arithmetic device 11 generates judgment information for judging whether the loading and unloading work is safe or not, based on the acquired work information, by the process shown in FIG. 11. Specifically, the judgment information during the loading and unloading work is safety information indicating that the stopper 103a was stored in the lifting platform 103 while the baggage 20 was being unloaded from the lifting platform 103, or caution information indicating that the stopper 103a was protruding from the lifting platform 103. The judgment information during the loading work is safety information indicating that the stopper 103a was protruding from the lifting platform 103 while the baggage 20 was being loaded onto the lifting platform 103, or caution information indicating that the stopper 103a was stored in the lifting platform 103. By using the generated judgment information, the safety of the loading and unloading work for the check item No. 6 can be improved.

[0074] Next, the process of generating the determination information for the check item No. 7 executed by the arithmetic device 11 will be described. FIG. 12 is a flowchart showing the process of generating the determination information for the check item No. 7. As shown in FIG. 12, the arithmetic device 11 first detects the luggage 20 protruding from the platform 103 from the image of the camera 35 (S81). Next, the arithmetic device 11 determines whether the luggage 20 protrudes from the platform 103 from the information of S81 (S82). If the arithmetic device 11 determines in S82 that the luggage 20 protrudes from the platform 103 (NO in S82), it generates warning information (S86) and returns the process from the subroutine to the main routine. If the arithmetic device 11 determines in S82 that the luggage 20 does not protrude from the platform 103 (YES in S82), it proceeds to the process of S83. When the calculation device 11 determines in S82 that the baggage 20 does not protrude from the platform 103 (YES in S82), the calculation device 11 may generate safety information in S85 and return the process from the subroutine to the main routine.

[0075] In S83, the arithmetic device 11 detects the distance between the worker and the platform 103 from the image of the camera 35 (S83). Next, the arithmetic device 11 determines whether or not the distance between the worker and the platform 103 exceeds a predetermined range from the information of S83 (S84). When the arithmetic device 11 determines in S84 that the distance between the worker and the platform 103 is far (YES in S84), it generates safety information indicating that the loading and unloading work is being performed safely (S85). When the arithmetic device 11 determines in S84 that the distance between the worker and the platform 103 is within a predetermined range (NO in S84), it generates caution information indicating that the loading and unloading work is not being performed safely (S86). Next, the arithmetic device 11 outputs the safety information or caution information (S87) and returns the process from the subroutine to the main routine.

[0076] The arithmetic device 11 acquires work information related to the loading and unloading work from the camera 35 via the input / output interface 13. Based on the acquired work information, the arithmetic device 11 generates judgment information for judging whether the loading and unloading work is safe or not by the process shown in FIG. 12. Specifically, the judgment information is safety information when the baggage 20 does not protrude from the platform 103 or caution information when the baggage 20 protrudes from the platform 103. The judgment information also includes safety information when the distance between the platform 103 and the worker exceeds a predetermined range or caution information when the distance between the platform 103 and the worker is within a predetermined range. By using the generated judgment information, the safety of the loading and unloading work for the check item No. 7 can be improved.

[0077] Although the arithmetic device 11 determines whether the luggage 20 protrudes from the platform 103 in S82, it may determine whether the luggage 20 is placed extremely close to the end of the platform 103. Specifically, the arithmetic device 11 may determine whether the luggage 20 is within a predetermined range, and determine that it is safe when the luggage 20 is within the predetermined range, and that caution is required when the luggage 20 is outside the predetermined range.

[0078] (Modification) The judgment information may be safety information when the rated weight of the tailgate lifter 102 is not exceeded while the platform 103 on which the luggage 20 is placed is moving up and down, or warning information when the rated weight is exceeded.

[0079] As the multiple sensors, tilt sensors capable of detecting the tilt of the entire body of a truck, which is the transportation equipment 100, may be used.

[0080] [Aspects] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0081] (Item 1) A control device according to one embodiment generates information related to the safety of a loading and unloading operation using a lifting platform of a tailgate lifter. The control device includes an acquisition unit that acquires operation information related to the loading and unloading operation from at least one sensor, and a calculation unit that generates determination information for determining whether the loading and unloading operation is safe or not, based on the operation information acquired by the acquisition unit.

[0082] According to the control device described in paragraph 1, a user can generate judgment information for judging whether or not loading and unloading work is safe based on work information regarding the loading and unloading work acquired by at least one sensor, and therefore can improve the safety of the loading and unloading work by using the judgment information.

[0083] (Paragraph 2) In the control device described in paragraph 1, the calculation unit determines whether or not the loading and unloading operation is safe based on the determination information.

[0084] According to the control device described in paragraph 2, the calculation unit determines whether or not the loading and unloading operation is safe based on the determination information, so that the safety of the loading and unloading operation can be improved.

[0085] (Item 3) The control device according to item 2 further includes an output unit that outputs the result of the determination by the calculation unit as to whether or not the loading and unloading operation is safe to an external device.

[0086] According to the control device described in paragraph 3, the result of the determination made by the calculation unit as to whether or not the loading and unloading operation is safe can be output to an external device.

[0087] (Item 4) The control device according to item 1, further comprising an output unit that outputs the determination information generated by the calculation unit to an external device.

[0088] According to the control device described in paragraph 4, the determination information generated by the calculation unit can be output to an external device.

[0089] (Clause 5) In the control device described in any one of clauses 1 to 4, the work information includes at least one of first work information for detecting the presence or absence of luggage placed on the lifting platform, second work information for detecting vertical movement of the lifting platform, third work information for detecting the state of a stopper that prevents luggage placed on the lifting platform from falling, fourth work information for detecting the inclination of the lifting platform, fifth work information for detecting the shaking of the lifting platform, sixth work information for detecting contact with the lifting platform, seventh work information for detecting a change in weight of an object on the lifting platform, eighth work information for detecting that luggage is being unloaded from the lifting platform, ninth work information for detecting that luggage is protruding from the lifting platform, and tenth work information for detecting the distance between the lifting platform and the worker.

[0090] According to the control device described in paragraph 5, it is possible to generate determination information for determining whether or not loading and unloading work is safe, based on a plurality of pieces of work information.

[0091] (Clause 6) In the control device described in clause 5, the calculation unit generates, as judgment information, information for determining whether or not the stopper protrudes from the platform while the platform on which the luggage is loaded is moving up and down, based on the first work information, the second work information, and the third work information.

[0092] According to the control device described in paragraph 6, it is possible to determine whether or not the stopper protrudes from the platform while the platform on which the luggage is placed is moving up and down.

[0093] (Clause 7) In the control device described in clause 5, the calculation unit generates, as judgment information, information for determining whether the platform on which a load is loaded is tilted while the platform is moving up and down, based on the first work information, the second work information, and the fourth work information.

[0094] According to the control device described in paragraph 7, it is possible to determine whether or not the platform on which the luggage is placed is tilted while the platform is moving up and down.

[0095] (Clause 8) In the control device described in clause 5, the calculation unit generates, as judgment information, information for determining whether the platform on which the luggage is loaded is shaking while the platform is moving up and down, based on the first work information, the second work information, and the fifth work information.

[0096] According to the control device described in paragraph 8, it is possible to determine whether or not the platform on which the luggage is placed is swaying while the platform is moving up and down.

[0097] (Clause 9) In the control device described in clause 5, the calculation unit generates, as judgment information, information for determining whether or not contact has occurred with the platform while the platform carrying the luggage is moving up and down, based on the first work information, the second work information, and the sixth work information.

[0098] According to the control device described in paragraph 9, it is possible to determine whether or not the platform on which the baggage is placed is contacted while the platform is moving up and down.

[0099] (Clause 10) In the control device described in clause 5, the calculation unit generates, as judgment information, information for determining whether the weight of an object on the platform has changed while the platform with the luggage loaded on it is moving up and down, based on the first work information, the second work information, and the seventh work information.

[0100] According to the control device described in paragraph 10, it is possible to determine whether or not the weight of the object on the platform has changed while the platform on which the load is placed is moving up and down.

[0101] (Article 11) In the control device described in paragraph 5, the calculation unit generates, as judgment information, information for determining whether or not the stopper protrudes from the platform while luggage is being unloaded from the platform, based on the third work information and the eighth work information.

[0102] According to the control device described in paragraph 11, it is possible to determine whether or not the stopper protrudes from the platform while the baggage is being unloaded from the platform.

[0103] (Item 12) In the control device described in item 5, the calculation unit generates, as the determination information, information for determining whether or not the luggage is protruding from the platform, based on the ninth work information.

[0104] According to the control device described in paragraph 12, it is possible to determine whether or not a baggage is protruding from the platform.

[0105] (Item 13) In the control device described in item 5, information for determining whether or not the distance between the platform and the worker exceeds a predetermined range is generated as determination information based on the tenth work information.

[0106] According to the control device described in paragraph 13, it is possible to determine whether or not the distance between the lift platform and the worker exceeds a predetermined range.

[0107] (Item 14) A determination system according to one embodiment relates to a determination system for determining the safety of a loading and unloading operation using a lifting platform of a tailgate lifter. The determination system includes at least one sensor that acquires work information related to the loading and unloading operation, a control device that generates determination information for determining whether the loading and unloading operation is safe or not based on the work information, and a determination device that determines whether the loading and unloading operation is safe or not based on the determination information acquired from the control device. The control device includes an acquisition unit that acquires the work information related to the loading and unloading operation from the at least one sensor, and a calculation unit that generates the determination information based on the work information acquired by the acquisition unit.

[0108] According to the judgment system described in paragraph 14, a user can generate judgment information for judging whether or not loading and unloading work is safe based on work information regarding loading and unloading work acquired by at least one sensor, and therefore can improve the safety of loading and unloading work by using the judgment information.

[0109] (Item 15) A control method according to one embodiment relates to a control method for generating, by a computer, information relating to the safety of a loading and unloading operation using a lifting platform of a tailgate lifter. The control method includes, as processing executed by the computer, a step of acquiring work information relating to the loading and unloading operation from at least one sensor, and a step of generating determination information for determining whether or not the loading and unloading operation is safe, based on the work information acquired by the acquiring step.

[0110] According to the control method described in paragraph 15, a user can generate judgment information for judging whether or not loading and unloading work is safe based on work information related to the loading and unloading work acquired by at least one sensor, and thus can improve the safety of the loading and unloading work by using the judgment information.

[0111] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present disclosure is defined by the claims, not by the description of the embodiments described above, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0112] 1 monitoring device, 2 server device, 4 communication network, 10 control device, 11 arithmetic device, 12 memory, 13 input / output interface, 14 communication interface, 15 storage device, 20 luggage, 31 pressure sensor, 32 proximity sensor, 33 voltage sensor, 34 inclination sensor, 35 camera, 100 transportation equipment, 101 loading platform, 101a door, 102 tailgate lifter, 103 lift platform, 103a, 103b stoppers, 105 cylinder, 106 hydraulic device, 107 operation switch, 151 weight conversion data, 152 voltage data, 1000 determination system.

Claims

1. A control device that generates information regarding the safety of a loading and unloading operation using a lifting platform of a tailgate lifter, an acquisition unit that acquires work information related to the loading and unloading work from at least one sensor; a calculation unit that generates determination information for determining whether or not the loading and unloading operation is safe based on the work information acquired by the acquisition unit.

2. The control device according to claim 1 , wherein the calculation unit determines whether or not the loading and unloading operation is safe based on the determination information.

3. The control device according to claim 2 , further comprising an output unit that outputs a determination result as to whether or not the loading and unloading operation is safe, determined by the calculation unit, to an external device.

4. The control device according to claim 1 , further comprising an output unit that outputs the determination information generated by the calculation unit to an external device.

5. A control device as described in any one of claims 1 to 4, wherein the work information includes at least one of first work information for detecting the presence or absence of luggage placed on the lifting platform, second work information for detecting vertical movement of the lifting platform, third work information for detecting the state of a stopper that prevents luggage placed on the lifting platform from falling, fourth work information for detecting the inclination of the lifting platform, fifth work information for detecting the swaying of the lifting platform, sixth work information for detecting contact with the lifting platform, seventh work information for detecting a change in the weight of an object on the lifting platform, eighth work information for detecting that the luggage is being unloaded from the lifting platform, ninth work information for detecting that luggage is protruding from the lifting platform, and tenth work information for detecting the distance between the lifting platform and a worker.

6. The control device according to claim 5, wherein the calculation unit generates, as the judgment information, information for determining whether or not the stopper protrudes from the platform while the platform on which the luggage is loaded is moving up and down, based on the first work information, the second work information, and the third work information.

7. The control device according to claim 5, wherein the calculation unit generates, as the judgment information, information for determining whether the platform on which the luggage is loaded is tilted while the platform is moving up and down, based on the first work information, the second work information, and the fourth work information.

8. The control device according to claim 5, wherein the calculation unit generates, as the judgment information, information for determining whether the platform on which the luggage is loaded is shaking while the platform is moving up and down, based on the first work information, the second work information, and the fifth work information.

9. The control device according to claim 5, wherein the calculation unit generates, as the judgment information, information for determining whether or not contact has occurred with the platform on which the luggage is loaded while the platform is moving up and down, based on the first work information, the second work information, and the sixth work information.

10. The control device according to claim 5, wherein the calculation unit generates, as the determination information, information for determining whether or not the weight of an object on the platform has changed while the platform on which the luggage is loaded is moving up and down, based on the first work information, the second work information, and the seventh work information.

11. The control device according to claim 5, wherein the calculation unit generates, as the judgment information, information for determining whether the stopper protrudes from the platform while the luggage is being unloaded from the platform, based on the third work information and the eighth work information.

12. The control device according to claim 5 , wherein the calculation unit generates, as the determination information, information for determining whether or not a load protrudes from an upper surface of the platform, based on the ninth work information.

13. The control device according to claim 5 , wherein the calculation unit generates, as the determination information, information for determining whether or not a distance between the platform and the worker exceeds a predetermined range, based on the tenth work information.

14. A judgment system for judging the safety of loading and unloading work using a lifting platform of a tailgate lifter, At least one sensor for acquiring work information related to the loading and unloading work; a control device that generates determination information for determining whether the loading and unloading operation is safe based on the work information; and a determination device that determines whether the loading and unloading operation is safe based on the determination information acquired from the control device, The control device includes: an acquisition unit that acquires the work information related to the loading and unloading work from the at least one sensor; A determination system comprising: a calculation unit that generates the determination information based on the work information acquired by the acquisition unit.

15. A control method for generating information regarding safety of a loading and unloading operation using a lifting platform of a tailgate lifter by a computer, comprising: The process executed by the computer is acquiring operation information relating to the loading and unloading operation from at least one sensor; and generating judgment information for judging whether the loading and unloading operation is safe based on the work information acquired in the acquiring step.

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