Work vehicle

Abstract

Provided is a cargo vehicle capable of raising awareness about heat stroke. 【Solution means】A cargo vehicle including a vehicle body 10, a voice alert unit 2, a control unit, and a thermistor Th, wherein the control unit includes a first control unit 40 that performs a control operation of the vehicle body 10, and a second control unit 50 that sets a definition of a dangerous act and issues an instruction to reproduce warning voice data to the voice alert unit 2 when the definition is satisfied, and the definition is characterized in that the temperature measured by the thermistor Th is equal to or higher than a preset temperature.

Description

[Technical field]

[0001] The present invention relates to a loading vehicle such as a forklift. [Background technology]

[0002] Conventionally, there are known forklifts that warn the operator with a buzzer or a warning light when a dangerous act occurs. For example, when there is a step on the road surface, the forklift described in Patent Document 1 lights up a warning light provided on the instrument panel of the driver's seat or sounds a buzzer to notify the operator that a step is nearby.

[0003] However, dangerous actions of a forklift include not only driving on a road surface with steps, but also various other actions (for example, colliding with an obstacle above or with a person). Therefore, there is a problem that the warning means such as a buzzer and a warning light in the forklift described in Patent Document 1 cannot immediately determine what kind of dangerous action has been detected.

[0004] In order to solve the above problems, the inventor of the present application has invented an alert system in which definitions of dangerous actions are set in advance and an audio warning (audio alert) is issued when a defined dangerous action occurs (see, for example, Patent Document 2). In the alert system described in Patent Document 2, the forklift operator can immediately determine which dangerous action has been detected by the audio alert and can take appropriate action. Furthermore, the alert system described in Patent Document 2 classifies dangerous actions by risk level and changes the frequency of audio alert activation (for example, playback time or number of playbacks) according to the risk level, thereby minimizing the decrease in work efficiency while avoiding dangerous actions and ensuring safety.

[0005] However, the alert system described in Patent Document 2 does not address dangerous behaviors related to temperature (for example, driving at high temperatures such as on a hot summer day). For this reason, measures to prevent heatstroke when driving a forklift are left to the discretion and actions of the individual operator.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] The present invention has been made in view of the above circumstances, and the problem thereof is to provide a cargo vehicle capable of raising awareness about heat stroke.

Means for Solving the Problems

[0008] In order to solve the above problems, the cargo vehicle according to the present invention includes a vehicle body provided with a cargo handling device, a voice alert unit that reproduces at least one warning voice data to give a voice warning, a control unit that controls the vehicle body and the voice alert unit, a temperature sensor that outputs a measurement signal related to temperature to the control unit, and is a cargo vehicle comprising the control unit includes a first control unit that performs a control operation of the vehicle body, a second control unit that sets a definition of a dangerous act and gives an instruction to reproduce the warning voice data to the voice alert unit when the definition is satisfied, wherein the definition is characterized in that the temperature measured by the temperature sensor is equal to or higher than a preset temperature.

[0009] The cargo vehicle includes a key switch provided on the vehicle body, and a power supply unit that supplies a power supply voltage to at least a part of the control unit when the key switch is in the key-on state. The second control unit can be configured to determine whether the definition is satisfied when the key switch is turned on.

[0010] In the handling vehicle, When the temperature is lower than the set temperature when the key is turned on, and the temperature becomes equal to or higher than the set temperature after a predetermined time has elapsed since the key was turned on and the definition is satisfied, the second control unit can be configured to issue the reproduction instruction when the traveling operation of the vehicle body and / or the handling operation of the handling device are not being performed.

[0011] The handling vehicle includes a display including a display unit and an input unit, the control unit includes a third control unit that controls the display, the third control unit causes the display unit to display an ON / OFF setting screen for switching between the ON setting and the OFF setting of the definition, the second control unit issues the reproduction instruction when the definition is in the ON setting, while not issuing the reproduction instruction when the definition is in the OFF setting can be configured as such.

[0012] The handling vehicle is provided with a head guard including a pillar and a roof, the temperature sensor is a thermistor, the second control unit can be configured to include the thermistor, a processing unit, and a storage unit and be attached to the pillar.

[0013] In the handling vehicle, the processing unit acquires the measurement signal of the thermistor and performs a temperature recording process of storing the temperature in the storage unit at a predetermined cycle, a reproduction instruction process of issuing the reproduction instruction when the temperature is equal to or higher than the set temperature, and an overheat protection process of restricting the operation of the second control unit when the temperature is equal to or higher than a protection temperature higher than the set temperature, can be configured to perform.

Advantages of the Invention

[0014] According to the present invention, it is possible to provide a handling vehicle capable of raising awareness about heat stroke.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

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Figure 4

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Figure 10

Figure 11

Modes for Carrying Out the Invention

[0016] Hereinafter, embodiments of a handling vehicle according to the present invention will be described with reference to the accompanying drawings.

[0017] FIG. 1 shows a forklift 1 according to an embodiment of the present invention. The forklift 1 is a counterbalance type forklift and corresponds to the "cargo handling vehicle" of the present invention. The forklift 1 performs a traveling operation and a cargo handling operation in a predetermined work area.

[0018] The work area is, for example, an area inside an arbitrary building such as a factory or a warehouse. A plurality of shelves are provided in the work area, and loads (including pallets) held and carried by the forklift 1 are stored on the shelves.

[0019] The forklift 1 includes a voice alert unit 2, a warning unit 3, and a display 4. The voice alert unit 2 gives a voice warning (voice alert) to the operator of the forklift 1 by reproducing pre-stored voice data. The warning unit 3 gives a warning to the operator by means other than voice. The display 4 is configured to be operable by an operator (administrator) or a service man (customer engineer). Details of the voice alert unit 2, the warning unit 3, and the display 4 will be described later.

[0020] The forklift 1 includes a vehicle body 10, a cargo handling device 20, a sensor unit 30, a first control unit 40, a second control unit 50, a third control unit 60, and a battery (corresponding to the "power supply unit" of the present invention) not shown. A thermistor Th corresponding to the "temperature sensor" of the present invention is provided in the second control unit 50.

[0021] The vehicle body 10 is equipped with a key switch. The key switch is configured to be operable by an operator and can be switched between an ON state and an OFF state by the operator's operation. When the key switch is in the ON state, the battery supplies a power voltage directly or via a DC / DC converter provided in the vehicle body 10 to the electrical system of the vehicle body 10 (for example, the first control unit 40, the second control unit 50, the third control unit 60, and the display 4). When the key switch is in the OFF state, the battery does not supply the power voltage. Note that a part of the electrical system (for example, various controllers of the first control unit 40) may be constantly supplied with the power voltage, and the second control unit 50 may be supplied with the power voltage from a power source different from the battery.

[0022] A pair of left and right front wheels 11 and rear wheels 12 are provided at the lower part of the vehicle body 10. In the forklift 1, the front wheels 11 are drive wheels driven by a traveling motor, and the rear wheels 12 are steering wheels steered (swiveled) by a steering motor.

[0023] An operator's driver's seat 13 is provided at the upper part of the vehicle body 10. An accelerator 14 and a brake 15 are provided at the lower front of the driver's seat 13, and a display 4, a steering wheel 16, and a cargo handling operation unit 17 are provided on the dashboard in front of the driver's seat 13.

[0024] The accelerator 14 is an accelerator pedal configured to be operable by an operator in the driver's seat 13 stepping on it with the foot. When the accelerator 14 is in the ON state (the pedal is depressed state), it accelerates the vehicle body 10 according to the depression amount of the pedal (accelerator opening), while when it switches from the ON state to the OFF state (the pedal is not depressed state), it generates a weak regenerative brake to decelerate the vehicle body 10.

[0025] The brake 15 is a brake pedal configured to be operable by an operator in the driver's seat 13 stepping on it with a foot. When the brake 15 is in the on state (the pedal is depressed), it generates a regenerative brake stronger than the regenerative brake of the accelerator 14 to decelerate the vehicle body 10, while when it is in the off state, it does not generate a regenerative brake.

[0026] The steering wheel 16 is connected to the rear wheels 12 via a steering control mechanism 42 described later. The operator can change the direction (steering angle) of the rear wheels 12 according to the rotation direction by rotating the steering wheel 16. When the steering wheel 16 is not being rotated (when going straight), the steering angle of the rear wheels 12 is 0 [°].

[0027] The cargo handling operation unit 17 includes a lift lever and a tilt lever. The lift lever and the tilt lever are connected to the cargo handling device 20 via a cargo handling control mechanism 43 described later. The operator can operate the cargo handling device 20 by operating the lift lever or the tilt lever.

[0028] A head guard 18 is provided above the upper part of the vehicle body 10 and above the driver's seat 13. The head guard 18 is composed of a pair of left and right front pillars, a pair of left and right rear pillars, and a roof.

[0029] The cargo handling device 20 includes a mast 21, a lift bracket 22, a fork 23, a backrest 24, a tilt cylinder 25, and a lift cylinder 26.

[0030] The mast 21 is provided on the front side of the vehicle body 10 and raises and lowers the fork 23. The mast 21 includes an outer mast and an inner mast. The outer mast includes a pair of left and right guide rails extending in the vertical direction and a cross beam connecting the upper ends of the guide rails. The inner mast moves up and down along the guide rails of the outer mast at half the speed of the fork 23 and the backrest 24. The outer mast does not move up and down.

[0031] The lift bracket 22 supports the fork 23 and moves up and down along the mast 21. The fork 23 is a pair of left and right L-shaped arms and is provided on the front surface of the lift bracket 22. The fork 23 holds the load. The backrest 24 is a frame for preventing the load held by the fork 23 from collapsing backward and is provided on the upper part of the lift bracket 22. When the mast 21 (inner mast) moves up and down, the lift bracket 22, the fork 23, and the backrest 24 also move up and down.

[0032] The tilt cylinder 25 is a hydraulic cylinder for tilting the mast 21 (fork 23) in the front-rear direction. In this embodiment, when the tilt lever is tilted forward, the tilt cylinder 25 extends and the mast 21 (fork 23) tilts forward, and when the tilt lever is tilted backward, the tilt cylinder 25 contracts and the mast 21 (fork 23) tilts backward. When the tilt lever is returned to the neutral position (a position where neither forward nor backward tilt is made), the tilting of the mast 21 (fork 23) stops.

[0033] The lift cylinder 26 is a hydraulic cylinder for raising and lowering the mast 21. In this embodiment, when the lift lever is tilted forward, the lift cylinder 26 contracts and the inner mast descends, and when the lift lever is tilted backward, the lift cylinder 26 extends and the inner mast ascends. When the lift lever is returned to the neutral position (a position where neither forward nor backward tilt is made), the raising and lowering of the inner mast stops.

[0034] The sensor unit 30 corresponds to the "monitoring unit" and includes a load sensor 31, a vehicle speed sensor 32, a turning angle sensor 33, an accelerator sensor 34, and a brake sensor 35. The measured values measured by each of the sensors 31 to 35 correspond to the "monitoring target values". The sensor unit 30 of this embodiment does not include the thermistor Th provided in the second control unit 50.

[0035] The load sensor 31 measures the load of the load held by the fork 23. As the load sensor 31, for example, a pressure sensor that measures the presence or absence of a load from the pressure of the lift cylinder 26 can be used. The vehicle speed sensor 32 measures the vehicle speed of the vehicle body 10. As the vehicle speed sensor 32, for example, a speed sensor that measures the traveling speed (vehicle speed) of the vehicle body 10 from the rotational speed and rotational direction of the traveling motor can be used. The turning angle sensor 33 measures the turning angle of the rear wheels 12. As the turning angle sensor 33, for example, an angle sensor that measures the turning angle of the rear wheels 12 from the rotation angle of the steering wheel 16, or an angle sensor that measures the turning angle of the rear wheels 12 from the rotation angle of the turning axis of the rear wheels 12 can be used. The accelerator sensor 34 measures the accelerator opening of the accelerator 14. The brake sensor 35 measures the state (on state / off state) of the brake 15.

[0036] Note that the sensor unit 30 may include sensors other than the sensors 31 to 35 described above. For example, the sensor unit 30 may include a sensor that measures the rotation direction and rotation amount of the steering wheel 16, or a sensor that measures the operation amount of the cargo handling operation unit 17 (lift lever and tilt lever). Further, the sensor unit 30 may include a sensor that detects the operator's departure from the driver's seat 13, or a sensor that detects the wearing / non-wearing of the seat belt provided on the driver's seat 13. The sensor that detects departure is, for example, a pressure sensor, a microswitch provided on the driver's seat 13, or an infrared sensor provided in the vicinity of the driver's seat 13. The seat belt sensor is, for example, a sensor that detects the wearing / non-wearing of the seat belt by detecting whether or not the tongue plate of the seat belt is inserted into the buckle. Further, the sensor unit 30 may include a sensor that detects whether the key switch is in the key-on state or the key-off state, and the sensor outputs a detection signal to the first control unit 40, the second control unit 50, and / or the third control unit 60.

[0037] The first control unit 40 is provided inside the vehicle body 10 and performs control operations of the vehicle body 10. As shown in FIG. 2, the first control unit 40 includes a travel control mechanism 41, a steering control mechanism 42, a cargo handling control mechanism 43, and a warning control mechanism 44.

[0038] The travel control mechanism 41 acquires a signal regarding the measured value (hereinafter referred to as a measurement signal) from the sensor unit 30 and controls the front wheels 11 which are the drive wheels. The travel control mechanism 41 includes, for example, a travel controller, a travel inverter, a travel motor, and a hydraulic circuit. The travel control mechanism 41 acquires the vehicle speed of the vehicle body 10 based on the measurement signal of the vehicle speed sensor 32, and calculates a target speed based on the measurement signal of the accelerator sensor 34 and / or the measurement signal of the brake sensor 35. The travel control mechanism 41 performs PI control or PID control in order to bring the vehicle speed closer to the target speed. The target speed is calculated, for example, by a calculation formula of target speed = set speed × accelerator opening [%]. The set speed is a speed preset in the travel controller.

[0039] The steering control mechanism 42 acquires a measurement signal regarding the rotation direction and rotation amount of the steering wheel 16 from the sensor unit 30 and controls the rear wheels 12 which are the steering wheels. The steering control mechanism 42 may acquire a measurement signal from the turning angle sensor 33. The steering control mechanism 42 includes, for example, a steering motor, a power steering device, a hydraulic circuit, etc.

[0040] The cargo handling control mechanism 43 acquires a measurement signal from the sensor unit 30 from the cargo handling operation unit 17 (lift lever and tilt lever) and controls the cargo handling device 20. The cargo handling control mechanism 43 includes, for example, a cargo handling controller, a cargo handling inverter, a cargo handling motor, a hydraulic circuit, etc.

[0041] The warning control mechanism 44 acquires a measurement signal from the sensor unit 30 and controls the warning unit 3. The warning control mechanism 44 includes, for example, a warning controller composed of a digital circuit such as a microcomputer. The warning control mechanism 44 sets a set value for the control operation for the warning unit 3, and when the measured value of the sensor unit 30 exceeds the set value, outputs a warning instruction to the warning unit 3 to cause the warning unit 3 to give a warning.

[0042] The warning unit 3 includes, for example, a stacked lamp that emits visible light as a warning to the operator, and a buzzer that emits a sound other than voice (buzzer sound) as a warning to the operator. For example, the warning control mechanism 44 sets a set value of the vehicle speed and a set value of the load, and when the measured value of the sensor unit 30 exceeds the set value (in the case of vehicle speed excess or load excess), causes the stacked lamp and / or the buzzer to give a warning.

[0043] Fig. 3 shows a block diagram of the second control unit 50 and the voice alert unit 2. The second control unit 50 sets the definition of a dangerous act, and when the definition is satisfied, gives an instruction to reproduce voice data to the voice alert unit 2. The second control unit 50 includes, for example, a data logger unit (DLU), and is provided on the front pillar of the head guard 18. The second control unit 50 includes an input unit 51, a storage unit 52, a processing unit 53, a thermistor Th, and an output unit 54.

[0044] The input unit 51 acquires the measurement signal of the sensor unit 30. Information regarding the measurement signal acquired by the input unit 51 is output to the storage unit 52 and / or the processing unit 53.

[0045] The storage unit 52 stores a plurality of dangerous act data. The dangerous act data is data in which the definition of a dangerous act is set. The definition of a dangerous act is, for example, a combination in which a unique dangerous act ID (hereinafter, ID), the name of the dangerous act, and the determination condition of the dangerous act are associated with each other. The definition of a dangerous act may include a restricted act of a driving operation and / or a cargo handling operation. Since the configuration of the dangerous act data is the same as the configuration of the dangerous act data described in Patent Document 2 explained in the background art, a detailed description is omitted here.

[0046] The storage unit 52 of the present embodiment stores, as dangerous behavior data, first dangerous behavior data for heat stroke warning. The first dangerous behavior data associates, for example, ID = "100", name of the dangerous behavior = "Heat stroke warning", and determination condition = "The temperature measured by the thermistor Th at the time of key-on is equal to or higher than the set temperature (in this embodiment, 32 [° C])". The temperature measured by the thermistor Th is, for example, the temperature (ambient temperature) calculated by the processing unit 53 based on the measurement signal of the thermistor Th. Also, in the present embodiment, the ID is a number, but the ID may be a character or a symbol, or a combination of characters, symbols, and numbers.

[0047] Based on the measurement signal of the sensor unit 30 and the measurement signal of the thermistor Th input to the input unit 51, the processing unit 53 determines whether the definition (determination condition) of each dangerous behavior is satisfied, and identifies the dangerous behavior data that satisfies the definition.

[0048] The thermistor Th is mounted on the mounting board inside the second control unit 50. At least the processing unit 53 is mounted on the mounting board. The thermistor Th outputs a measurement signal regarding the temperature (ambient temperature) around the thermistor Th by changing its resistance value according to the temperature. For example, when the processing unit 53 applies a predetermined voltage to the thermistor Th, the processing unit 53 acquires a voltage signal (measurement signal) of a voltage value corresponding to the resistance value from the thermistor Th. The processing unit 53 calculates the temperature (ambient temperature) around the thermistor Th from the measurement signal of the thermistor Th.

[0049] As processing using the measurement signal of the thermistor Th, the processing unit 53 performs temperature recording processing, playback instruction processing, and overheat protection processing.

[0050] During the temperature recording process, the processing unit 53, as described above, acquires the measurement signal of the thermistor Th and stores the temperature (ambient temperature) in the storage unit 52 at a predetermined cycle (for example, a cycle of 1 second). As a result, data (log data) for recording the temperature of the work area is generated in the storage unit 52. The above cycle can be changed as appropriate.

[0051] During the reproduction instruction process, the processing unit 53 determines whether the determination condition for heat stroke caution (the temperature measured by the thermistor Th at key-on is 32 [°C] or higher, which is the set temperature) is satisfied at key-on. When it is determined that the determination condition is satisfied, the first dangerous behavior data is specified, and a reproduction instruction is sent to the voice alert unit 2 via the output unit 54. Since the timing condition of "at key-on" is included in the determination condition for the processing unit 53 of the present embodiment, the determination of whether the determination condition is satisfied is made at key-on. However, the timing of the determination can be appropriately changed according to the timing condition included in the determination condition.

[0052] During the overheat protection process, the processing unit 53 compares the temperature (ambient temperature) with the protection temperature at a predetermined cycle. When the temperature (ambient temperature) is equal to or higher than the protection temperature, the operation of the second control unit 50 is restricted. The protection temperature is set to a temperature higher than the set temperature of the determination condition for heat stroke caution (for example, 70 [°C]). The operation of the second control unit 50 is an operation performed by at least a part of the input unit 51, the storage unit 52, the processing unit 53, and the output unit 54. By restricting the operation of the second control unit 50, at least a part of the functions of the second control unit 50 are restricted, or at least a part of the functions of the second control unit 50 are stopped. Which operation is restricted can be arbitrarily set.

[0053] When the definition of a dangerous behavior is satisfied, the output unit 54 issues a reproduction instruction for voice data to the voice alert unit 2. Specifically, the output unit 54 transmits a first signal regarding the ID of the dangerous behavior data specified by the processing unit 53 to the voice alert unit 2. In addition, the output unit 54 transmits a second signal regarding the restricted behavior associated with the ID to the first control unit 40 as a restriction instruction. The restriction instruction is, for example, the stop of the running operation of the vehicle body 10 and / or the stop of the loading operation of the loading device 20. The transmission timing of the first signal (reproduction instruction) and the second signal (restriction instruction) may be the same or different.

[0054] The voice alert unit 2 receives a playback instruction from the second control unit 50 and issues a voice warning (voice alert). The voice of the present invention is a voice including a language voice capable of transmitting information to the operator. The voice alert unit 2 is provided, for example, at the lower part of the roof of the head guard 18. The voice alert unit 2 includes a voice data storage unit 2A, a voice data processing unit 2B, and a speaker 2C.

[0055] The voice data storage unit 2A stores a plurality of voice data in which data of warning voices (hereinafter referred to as warning voice data) are associated with IDs. Since the configuration of the voice data is the same as the configuration of the voice data described in Patent Document 2 explained in the background art, detailed description is omitted here.

[0056] The voice data storage unit 2A of the present embodiment stores voice data for raising awareness of heat stroke. The voice data is, for example, associated with ID = "100" and warning voice data = "Please work with caution for heat stroke". The warning voice data of ID "100" includes the word (information) "heat stroke" which is directly or indirectly related to heat stroke. Therefore, it is possible to surely raise the operator's awareness regarding heat stroke.

[0057] The voice data processing unit 2B acquires the first signal output from the output unit 54 and plays back the warning voice data associated with the ID of the first signal in the voice data storage unit 2A. For example, when receiving the first signal regarding ID "100" from the output unit 54, the voice data processing unit 2B plays back the warning voice data "Please work with caution for heat stroke" of ID "100". The voice data processing unit 2B includes, for example, a voice player module.

[0058] Speaker 2C is connected to the voice data processing unit 2B and outputs the voice of the warning voice data being played by the voice data processing unit 2B. For example, when the voice data processing unit 2B is playing the warning voice data with the ID "100", the speaker 2C outputs the voice "Please work while paying attention to heat stroke". The speaker 2C can adjust the volume of the voice under the control of the second control unit 50.

[0059] Figure 4 shows the relationship between the third control unit 60 and the display 4. The third control unit 60 is provided inside the vehicle body 10 and controls the display 4. The third control unit 60 is composed of a digital circuit such as a microcomputer, for example. The third control unit 60 causes the display 4 to display a setting screen for changing and / or invalidating the definition of dangerous acts, and changes and / or invalidates the definition according to the input operation on the display 4. Similarly, the third control unit 60 causes the display 4 to display a setting screen for changing and / or invalidating the set value of the control operation for the warning unit 3, and changes and / or invalidates the set value according to the input operation on the display 4.

[0060] The display 4 is provided on the dashboard of the vehicle body 10 and includes a display unit 4A and an input unit 4B. The display 4 is, for example, a liquid crystal display, and the display unit 4A and the input unit 4B are, for example, liquid crystal screens controlled by the third control unit 60.

[0061] The display unit 4A displays, for example, a screen including a menu area A1 and a sub-menu area A2. One item is displayed in the menu area A1, and a plurality (three in this embodiment) of sub-items and a cursor are displayed in the sub-menu area A2.

[0062] The input unit 4B includes various switches B1 to B4. In this embodiment, the switch B1 is a switch displayed as "OK", and is a switch for determining a selection item or confirming a setting. The switch B2 is a switch displayed as "C", and is a switch for returning to the previous screen. The switch B3 is a switch displayed as "▲", and is a switch for moving the cursor upward or increasing a numerical value. The switch B4 is a switch displayed as "▼", and is a switch for moving the cursor downward or decreasing a numerical value. Note that the various switches B1 to B4 may be physical switches.

[0063] In the forklift 1 according to this embodiment, the definition of a dangerous act can be changed and / or invalidated on the display 4 without changing the software for voice alerts (for example, the software for updating a plurality of dangerous act data stored in the storage unit 52). Therefore, according to the forklift 1 according to this embodiment, the number of times of changing the software for voice alerts can be significantly reduced.

[0064] FIG. 5 shows a screen displayed on the display unit 4A, which is a screen for changing or invalidating the set value of the control operation (speed warning) for the warning unit 3.

[0065] The control operation (speed warning) is an operation in which when the vehicle speed (measured value) of the vehicle body 10 exceeds the set value, the warning control mechanism 44 of the first control unit 40 gives a warning instruction to the warning unit 3. The warning unit 3 that has received the warning instruction issues, for example, a buzzer sound.

[0066] The screen S1 displayed on the display unit 4A is an administrator settings screen. The administrator settings screen is, for example, a screen operable by an operator (administrator) having a predetermined authority. On the screen S1, an item "Administrator Settings" is displayed in the menu area A1, sub-items including "Speed Warning" are displayed in the sub-menu area A2, and the cursor is placed on "Speed Warning". When the switch B1 is operated in this state, the third control unit 60 causes the display unit 4A to display the screen S2. Also, when the switch B2 is operated while the screen S2 is being displayed, the third control unit 60 causes the display unit 4A to display the previous screen, i.e., the screen S1.

[0067] On the screen S2, an item "Speed Warning" is displayed in the menu area A1, and a setting value area A3 is displayed instead of the sub-menu area A2. In the setting value area A3, a numerical input field for inputting a setting value is displayed, and the numerical range within which input is possible is displayed below it. The numerical value of the setting value can be increased or decreased within the numerical range of 1 to 15 [km / h] by operating the switches B3 and B4. When "--" is input into the numerical input field by operating the switches B3 and B4, the setting value is invalidated and there is no warning indication (no buzzer sound).

[0068] In the present embodiment, the setting value of the control operation (speed warning) is associated with the threshold value of the dangerous act (speed overlimit). The dangerous act (speed overlimit) is an act in which the vehicle speed (measured value) of the vehicle body 10 exceeds the threshold value, and the above-mentioned threshold value is the vehicle speed value included in the determination condition of the dangerous act data. When the vehicle speed exceeds the threshold value, the second control unit 50 gives a reproduction instruction to the voice alert unit 2. The voice alert unit 2 that has received the reproduction instruction gives a voice alert.

[0069] When the setting value of the control operation (speed warning) is changed or invalidated by an input operation, the third control unit 60 gives a change instruction for changing or invalidating the threshold value of the dangerous act (speed overlimit) in association with the changed setting value. The second control unit 50 that has received the change instruction changes or invalidates the threshold value of the dangerous act (speed overlimit) in association with the setting value of the control operation (speed warning).

[0070] The second control unit 50 of the present embodiment changes the set value of the control operation (speed warning) and the threshold value of the dangerous behavior (speed exceeding) to the same value. As a result, when the vehicle speed (measured value) of the vehicle body 10 exceeds the set value, the warning unit 3 emits a buzzer sound and the voice alert unit 2 issues a voice alert. When the set value is invalidated, the warning unit 3 does not emit a buzzer sound and the voice alert unit 2 does not issue a voice alert.

[0071] As described above, since the threshold value of the dangerous behavior is changed or invalidated in conjunction with the set value of the control operation, it is not necessary to change or invalidate the set value and the threshold value separately. As a result, the time required for the change or invalidation can be shortened. When the default set value and the default threshold value are different, instead of changing them to the same value, the increase or decrease amount of the set value and the increase or decrease amount of the threshold value may be the same.

[0072] In the above, the set value of the control operation (speed warning) and the threshold value of the dangerous behavior (speed exceeding) have been described. However, if the monitoring target by the sensor unit 30 is the same, the set value of other control operations and the threshold value of other dangerous behaviors may be associated and linked. For example, by associating the set value of the control operation (load exceeding) and the threshold value of the dangerous behavior (load exceeding) (for example, setting the set value and the threshold value to the same value), when the load is exceeded, the warning unit 3 may emit a buzzer sound and the voice alert unit 2 may issue a voice alert.

[0073] Fig. 6 shows screens S11 to S14 displayed on the display unit 4A for changing or invalidating the definition of dangerous behavior. On screens S11 to S14, when the switch B1 is operated, the next screen is advanced, and when the switch B2 is operated, the previous screen is returned to.

[0074] On screen S11, an item of "Administrator Settings" is displayed in the menu area A1, sub-items including "Dangerous Behavior Judgment" are displayed in the sub-menu area A2, and the cursor is combined with "Dangerous Behavior Judgment".

[0075] On screen S12, an item "Dangerous Act Judgment" is displayed in menu area A1, sub-items "Dangerous Act 1" to "Dangerous Act 3" are displayed in sub-menu area A2, and the cursor is aligned with "Dangerous Act 1". "Dangerous Act 1" to "Dangerous Act 3" are, for example, the names of dangerous acts included in the definition of dangerous acts. On screen S12, by operating switch B4, "Dangerous Act 4" and subsequent items can be displayed. Note that the sub-items after "Dangerous Act 1" on screen S12 may be displayed in place of "Dangerous Act Judgment" on screen S11.

[0076] Screen S13 corresponds to the "ON / OFF Setting Screen" of the present invention. On screen S13, an item "Dangerous Act 1" is displayed in menu area A1, and an ON / OFF setting area A4 is displayed instead of sub-menu area A2. In ON / OFF setting area A4, "ON", "OFF", and a cursor are displayed, and the cursor can be moved by operating switch B3 and switch B4 to select "ON" or "OFF". When "Dangerous Act 1" is set to "ON", the second control unit 50 activates the definition of "Dangerous Act 1" and gives a reproduction instruction to the voice alert unit 2 when the definition (the judgment conditions included in the definition) is satisfied. On the other hand, when "Dangerous Act 1" is set to "OFF", the second control unit 50 deactivates the definition of "Dangerous Act 1" and does not give a reproduction instruction to the voice alert unit 2.

[0077] On screen S14, an item "Dangerous Act 1" is displayed in menu area A1, and a threshold area A5 is displayed instead of sub-menu area A2. In threshold area A5, a numerical input field for inputting a threshold value is displayed, and a reference value is displayed below it. The numerical value of the threshold can be increased or decreased within a predetermined numerical range by operating switch B3 and switch B4. Note that instead of displaying screen S13 of the previous screen, it may be possible to input "--" in the numerical input field of screen S14, and the threshold value can be deactivated by inputting "--". When the threshold value of "Dangerous Act 1" is deactivated, the definition of "Dangerous Act 1" is deactivated.

[0078] The reference value displayed in the threshold area A5 is the same monitored value as the threshold value, and for example, it is the maximum value of the monitored value within a predetermined time including the occurrence of dangerous behavior 1. When "dangerous behavior 1" is speeding, the second control unit 50 stores the vehicle speed measured by the sensor unit 30 until a predetermined time (for example, 5 minutes) elapses after the speeding occurs, and identifies the maximum value of the vehicle speed. The third control unit 60 causes the maximum value of the vehicle speed to be displayed in the threshold area A5 as the reference value.

[0079] When the threshold value of "dangerous behavior 1" is changed or invalidated by an input operation, the third control unit 60 issues a change instruction for changing or invalidating the threshold value of "dangerous behavior 1". The second control unit 50 that has received the change instruction changes or invalidates the threshold value of "dangerous behavior 1".

[0080] Figures 7 to 10 show screens S101 to S130 displayed on the display unit 4A for changing or invalidating the definitions of other dangerous behaviors. In Figures 7 to 10, the description of the reference value (for example, the maximum value of the previous measurement value) displayed in the threshold area A5 is omitted.

[0081] [Sharp Turn Warning] Screens S101 and S102 are screens for changing or invalidating the definition of dangerous behavior (sharp turn warning). The definition of dangerous behavior (sharp turn warning) includes, as the determination condition for the sharp turn warning, that "the turning angle (left turning angle or right turning angle) of the rear wheel 12 exceeds the start angle of restriction [°] and the vehicle speed exceeds the vehicle speed limit value [km / h]". When the said definition (determination condition) is satisfied, the voice alert unit 2 reproduces warning voice data "Sharp turn detected" as a voice alert.

[0082] On screen S101, an item "Administrator Settings" is displayed in menu area A1, sub-items including "Sharp Turn Warning" are displayed in sub-menu area A2, and the cursor is placed on "Sharp Turn Warning". On screen S102, an item "Sharp Turn Warning" is displayed in menu area A1, and a numerical input field and a numerical range are displayed in threshold area A5. In the numerical input field, the increase or decrease value [km / h] of the vehicle speed limit value is input as the threshold. The numerical value of the threshold can be increased or decreased by operating switches B3 and B4. When "--" is input in the numerical input field, it is invalidated and there is no playback instruction.

[0083] When the threshold (increase or decrease value of the vehicle speed limit value) is changed or invalidated by an input operation, the third control unit 60 issues a change instruction to change or invalidate the vehicle speed limit value. The second control unit 50 that receives the change instruction changes or invalidates the vehicle speed limit value for the sharp turn warning.

[0084] [Sudden Acceleration / Deceleration Warning] Screens S103 and S104 are for collectively changing or invalidating the definitions of dangerous behaviors (sudden acceleration during forward movement, sudden acceleration during reverse movement, sudden deceleration during forward movement, sudden deceleration during reverse movement). The definition of the dangerous behavior (sudden acceleration during forward movement) includes, as a determination condition, "accelerating at a rate of the first threshold [km / h / s] or more per second during forward movement", and the definition of the dangerous behavior (sudden acceleration during reverse movement) includes, as a determination condition, "accelerating at a rate of the second threshold [km / h / s] or more per second during reverse movement". The definition of the dangerous behavior (sudden deceleration during forward movement) includes, as a determination condition, "decelerating at a rate of the third threshold [km / h / s] or more per second during forward movement", and the definition of the dangerous behavior (sudden deceleration during reverse movement) includes, as a determination condition, "decelerating at a rate of the fourth threshold [km / h / s] or more per second during reverse movement". When any of the definitions (determination conditions) is satisfied, the voice alert unit 2 during sudden acceleration plays warning voice data "Sudden acceleration detected" as a voice alert, and the voice alert unit 2 during sudden deceleration plays warning voice data "Sudden deceleration detected" as a voice alert.

[0085] On screen S103, an item "Administrator Settings" is displayed in menu area A1, sub-items including "Sudden Acceleration / Deceleration Warning" are displayed in sub-menu area A2, and the cursor is on "Sudden Acceleration / Deceleration Warning". On screen S103, dangerous behaviors (sudden acceleration when moving forward, sudden acceleration when moving backward, sudden deceleration when moving forward, sudden deceleration when moving backward) are grouped together and displayed as a dangerous behavior (Sudden Acceleration / Deceleration Warning). On screen S104, an item "Sudden Acceleration / Deceleration Warning" is displayed in menu area A1, and a numerical input field and a numerical range are displayed in threshold area A5. In the numerical input field, a common threshold value [km / h / s] for the first threshold, the second threshold, the third threshold, and the fourth threshold is input. The common threshold value is the absolute value of acceleration, and its numerical value can be increased or decreased by operating switch B3 and switch B4. When "--" is input into the numerical input field by operating switch B3 and switch B4, the common threshold value is invalidated and there is no playback instruction.

[0086] When the common threshold value is changed or invalidated by an input operation, the third control unit 60 issues a change instruction to change or invalidate the first threshold, the second threshold, the third threshold, and the fourth threshold all at once. The second control unit 50 that receives the change instruction changes or invalidates the first threshold, the second threshold, the third threshold, and the fourth threshold included in each definition all at once.

[0087] [Sudden Reversal Warning] Screens S105 and S106 are screens for validating or invalidating the definition of the dangerous behavior (Sudden Reversal Warning). The definition of the dangerous behavior (Sudden Reversal Warning) includes "the time when the vehicle speed during forward and backward reversal is less than the speed limit [km / h] is less than the first time [s]" as the determination condition for the sudden reversal warning. When the said definition (determination condition) is satisfied, the voice alert unit 2 plays back warning voice data "Please reverse after stopping temporarily" as a voice alert.

[0088] The forward and backward reversal operation occurs, for example, when the forward and backward lever provided in front of the driver's seat 13 is switched from a state where it is tilted forward (forward position) with the accelerator 14 on to a state where it is tilted backward (backward position) while keeping the accelerator 14 on, or when it is switched from the backward position to the forward position.

[0089] On the screen S105, an item of "Administrator Settings" is displayed in the menu area A1, sub-items including "Sudden Reversal Warning" are displayed in the sub-menu area A2, and the cursor is aligned with "Sudden Reversal Warning". On the screen S106, an item of "Sudden Reversal Warning" is displayed in the menu area A1, and in the ON / OFF setting area A4, "ON", "OFF", and the cursor are displayed.

[0090] When set to "ON" on the screen S106, the second control unit 50 activates the definition of a dangerous act (sudden reversal warning) and issues a playback instruction to the voice alert unit 2 when the definition is satisfied. On the other hand, when set to "OFF" on the screen S106, the second control unit 50 deactivates the definition of a dangerous act (sudden reversal warning) and does not issue a playback instruction to the voice alert unit 2. Note that on the screen S106, instead of displaying the ON / OFF setting area A4, a threshold area A5 for changing or deactivating the speed limit [km / h] (without a playback instruction) may be displayed.

[0091] [Loaded load] The screens S107 and S108 are screens for collectively changing the load thresholds for a plurality of dangerous acts in which the load thresholds [kg] are included in the definition. The above-mentioned plurality of dangerous acts include, for example, load excess, a traveling simultaneous operation warning and a cargo handling simultaneous operation warning described later. For example, when the definition of load excess is satisfied, the voice alert unit 2 plays back warning voice data of "The load is over" as a voice alert.

[0092] On screen S107, an item of "Administrator Settings" is displayed in menu area A1, sub-items including "Loaded Weight" are displayed in sub-menu area A2, and the cursor is placed on "Loaded Weight". On screen S107, a plurality of dangerous acts including a load threshold in the definition are grouped together and displayed as a dangerous act (loaded weight). On screen S108, an item of "Loaded Weight" is displayed in menu area A1, and a numerical input field and a numerical range are displayed in threshold area A5. A numerical value of the load threshold is input into the numerical input field. The numerical value of the load threshold can be increased or decreased in increments of a predetermined amount (for example, 10 [kg]) by operating switches B3 and B4.

[0093] When the load threshold is changed by an input operation, the third control unit 60 issues a change instruction for collectively changing the load thresholds included in the definitions of a plurality of dangerous acts. The second control unit 50 that has received the change instruction collectively changes the load thresholds included in the definitions of a plurality of dangerous acts.

[0094] [Warning during simultaneous operation of traveling] Screens S109 and S110 are screens for changing or invalidating the definition of a dangerous act (warning during simultaneous operation of traveling). The definition of the dangerous act (warning during simultaneous operation of traveling) includes "during a loading / unloading operation and during a traveling operation" as a determination condition (simultaneous operation condition) for the warning during simultaneous operation of traveling. In the present embodiment, since the loading / unloading operation includes the raising operation and the lowering operation of the fork 23, and the traveling operation includes a traveling operation with turning (forward or backward movement) and a traveling operation without turning (forward or backward movement), there are four types of definitions of the dangerous act (warning during simultaneous operation of traveling). When any of the definitions (determination conditions) is satisfied, the voice alert unit 2 plays warning voice data of "Do not perform simultaneous operations" as a voice alert.

[0095] On screen S109, an item "Administrator Settings" is displayed in menu area A1, sub-items including "Warning for Concurrent Operations During Driving" are displayed in sub-menu area A2, and the cursor is placed on "Warning for Concurrent Operations During Driving". On screen S110, an item "Warning for Concurrent Operations During Driving" is displayed in menu area A1, and a condition setting area A6 is set. In condition setting area A6, a condition selection bar is displayed, and various conditions that can be selected by operating switch B3 and switch B4 are displayed in the condition selection bar. The various conditions include "Always", "With Load", "During Turning", "During Turning with Load", and "OFF". Additionally, "Exceeding the Vehicle Speed Limit Value" may be included in the above various conditions.

[0096] The third control unit 60 issues a change instruction to change or invalidate the definition of a dangerous act (warning for concurrent operations during driving) according to the selected condition. The second control unit 50 that receives the change instruction changes or invalidates the definition of the dangerous act (warning for concurrent operations during driving). For example, when "Always" is selected, the second control unit 50 issues a reproduction instruction to the voice alert unit 2 when any one of the definitions of four types of dangerous acts (warning for concurrent operations during driving) is satisfied. When "With Load" is selected, the second control unit 50 adds a condition of a load threshold value to the above definition. The load threshold value can be changed on screen S108. When "During Turning" is selected, the second control unit 50 adds a condition of a turning angle to the above definition. Thereby, the driving operation is limited to a turning driving operation. When "During Turning with Load" is selected, the second control unit 50 adds a condition of a load threshold value and a condition of a turning angle to the above definition. When "OFF" is selected, the second control unit 50 invalidates the above definition and does not issue a reproduction instruction.

[0097] [Warning for Concurrent Loading Operations] Screens S111 and S112 are for changing or invalidating the definition of a dangerous operation (simultaneous handling operation warning). The definition of the dangerous operation (simultaneous handling operation warning) includes "multiple handling operations being executed" as the determination condition (simultaneous handling operation condition) for the simultaneous handling operation warning. Multiple handling operations refer to two or more different handling operations, for example, the tilting operation of the mast 21 and the lifting and lowering operation of the fork 23. When the said definition (determination condition) is satisfied, the voice alert unit 2 plays the warning voice data "Please do not operate simultaneously" as a voice alert.

[0098] On screen S111, an item "Administrator settings" is displayed in the menu area A1, sub-items including "Simultaneous handling operation warning" are displayed in the sub-menu area A2, and the cursor is aligned with "Simultaneous handling operation warning". On screen S112, an item "Simultaneous handling operation warning" is displayed in the menu area A1, and a condition setting area A6 is set. Various conditions selectable by operating the switches B3 and B4 are displayed in the condition selection column of the condition setting area A6. The various conditions include "Always", "With load", and "OFF". These conditions are the same as those for the travel simultaneous operation warning.

[0099] The third control unit 60 gives a change instruction for changing or invalidating the definition of the dangerous operation (simultaneous handling operation warning) according to the selected condition. The second control unit 50 that receives the change instruction changes or invalidates the definition of the dangerous operation (simultaneous handling operation warning). For example, when "Always" is selected, the second control unit 50 gives a playback instruction to the voice alert unit 2 when the said definition is satisfied. When "With load" is selected, the second control unit 50 adds a condition of a load threshold value to the said definition. When "OFF" is selected, the second control unit 50 invalidates the said definition and does not give a playback instruction.

[0100] [Warning during turning while pulling out claws] Screens S113 and S114 are screens for enabling or disabling the definition of a dangerous act (swivel warning during unclamping). The definition of the dangerous act (swivel warning during unclamping) includes "during unclamping and during swiveling" as the determination condition for the swivel warning during unclamping. When the said definition (determination condition) is satisfied, the voice alert unit 2 reproduces warning voice data "Please do not swivel, the claws are being pulled out" as a voice alert.

[0101] The second control unit 50 determines that it is during unclamping, for example, when "the state where the load is less than the fifth threshold value [kg] and the reverse travel distance of the vehicle body 10 from the time when the load changes to a state where the load is less than the fifth threshold value is within a preset first distance [m]]". The fifth threshold value is set separately from the above load threshold value and is set to a value that can distinguish between the state with a load and the state without a load. The first distance is set to a value that can determine whether the fork 23 has completely come out of the pallet of the load. Also, the second control unit 50 determines that it is during swiveling, for example, when "the swivel angle of the rear wheel 12 is equal to or greater than a predetermined first angle [°]". The first angle can be set to any value greater than 0 [°].

[0102] On screen S113, an item "Administrator settings" is displayed in the menu area A1, sub-items including "Swivel warning during unclamping" are displayed in the sub-menu area A2, and the cursor is aligned with "Swivel warning during unclamping". On screen S114, an item "Swivel warning during unclamping" is displayed in the menu area A1, and in the ON / OFF setting area A4, "ON", "OFF", and the cursor are displayed.

[0103] When set to "ON" on screen S114, the second control unit 50 enables the definition of the dangerous act (swivel warning during unclamping) and gives a reproduction instruction to the voice alert unit 2 when the definition is satisfied. On the other hand, when set to "OFF" on screen S114, the second control unit 50 disables the definition of the dangerous act (swivel warning during unclamping) and does not give a reproduction instruction to the voice alert unit 2. Note that on screen S114, instead of displaying the ON / OFF setting area A4, a threshold area A5 for changing at least one of the fifth threshold value, the first distance, and the first angle may be displayed.

[0104] [Travel Warning Other than Rear Tilt] Screens S115 and S116 are screens for changing or invalidating the definition of a dangerous act (travel warning other than rear tilt). The definition of the dangerous act (travel warning other than rear tilt) includes, as the determination condition for the travel warning other than rear tilt, "while the fork 23 is in the forward tilt state and during the traveling operation, or while the fork 23 is in the horizontal state and during the traveling operation". When the said definition (determination condition) is satisfied, the voice alert unit 2 reproduces, as a voice alert, warning voice data of "Please tilt backward, you are traveling".

[0105] On screen S115, an item of "Administrator Settings" is displayed in the menu area A1, sub-items including "Travel Warning Other than Rear Tilt" are displayed in the sub-menu area A2, and the cursor is combined with "Travel Warning Other than Rear Tilt". On screen S116, an item of "Travel Warning Other than Rear Tilt" is displayed in the menu area A1, and the condition setting area A6 is set. Various conditions selectable by operating the switch B3 and the switch B4 are displayed in the condition selection column of the condition setting area A6. The various conditions include "Always", "With Load", and "OFF". These conditions are the same as those in the case of the simultaneous travel operation warning.

[0106] The third control unit 60 issues a change instruction for changing or invalidating the definition of the dangerous act (travel warning other than rear tilt) according to the selected condition. The second control unit 50 that has received the change instruction changes or invalidates the definition of the dangerous act (travel warning other than rear tilt). For example, when "Always" is selected, the second control unit 50 issues a reproduction instruction to the voice alert unit 2 when the said definition is satisfied. When "With Load" is selected, the second control unit 50 adds a condition of a load threshold value to the said definition. When "OFF" is selected, the second control unit 50 invalidates the said definition and does not issue a reproduction instruction.

[0107] [Non-horizontal Lift Warning] Screens S117, S118, and S118’ are screens for changing or invalidating the definition of a dangerous act (non-horizontal lift warning). The definition of the dangerous act (non-horizontal lift warning) includes, as the determination conditions for the non-horizontal lift warning, "while the fork 23 is rising in the forward-tilt state, while the fork 23 is rising in the rear-tilt state, while the fork 23 is descending in the forward-tilt state, or while the fork 23 is descending in the rear-tilt state". When the said definition (determination conditions) is satisfied, the voice alert unit 2 plays, as a voice alert, warning voice data "Please keep the claws horizontal, during lift operation".

[0108] On screen S117, an item "Administrator settings" is displayed in the menu area A1, sub-items including "Non-horizontal lift warning" are displayed in the sub-menu area A2, and the cursor is aligned with "Non-horizontal lift warning". On screen S118, an item "Non-horizontal lift warning - rising" is displayed in the menu area A1, and the condition setting area A6 is set. In the condition selection column of the condition setting area A6, various conditions selectable by operating the switches B3 and B4 are displayed. The various conditions include the same "Always", "With load", "OFF" as in the case of the travel simultaneous operation warning, and further include "With load - forward tilt" and "Without load". On screen S118’, an item "Non-horizontal lift warning - descending" is displayed in the menu area A1, and the condition setting area A6 is set. The various conditions selectable in the condition setting area A6 are the same as those on screen S118.

[0109] In this embodiment, on screen S118, the definition of "while the fork 23 is rising in the forward-tilt state, while the fork 23 is rising in the rear-tilt state" can be changed or invalidated, and on screen S118’, the definition of "while the fork 23 is descending in the forward-tilt state and while the fork 23 is descending in the rear-tilt state" can be changed or invalidated. Note that the definition of the dangerous act (non-horizontal lift warning) may be made changeable or invalidatable on a single screen.

[0110] The third control unit 60 issues a change instruction to change or invalidate the definition of a dangerous act (non-horizontal lift warning) according to the selected condition. The second control unit 50 that has received the change instruction changes or invalidates the definition of the dangerous act (non-horizontal lift warning). For example, when "always" is selected, the second control unit 50 issues a reproduction instruction to the voice alert unit 2 when the above definition is satisfied. When "with load" or "without load" is selected, the second control unit 50 adds the condition of the load threshold value to the above definition (for "with load", it is a condition that the load exceeds the threshold value, and for "without load", it is a condition that the load is below the threshold value). When "with load and forward tilt" is selected, the second control unit 50 adds the condition of the load threshold value (exceeding the load threshold value) to the above definition and also adds the condition that the fork 23 is in the forward tilt state. When "OFF" is selected, the second control unit 50 invalidates the above definition and does not issue a reproduction instruction. That is, when "OFF" is selected on the screen S118, the second control unit 50 invalidates a part of the definition, "while the fork 23 is rising in the forward tilt state and while the fork 23 is rising in the rear tilt state", and issues a reproduction instruction when the fork 23 is descending in the forward tilt state or when the fork 23 is descending in the rear tilt state. When "OFF" is selected on the screen S118', the second control unit 50 invalidates a part of the definition, "while the fork 23 is descending in the forward tilt state and while the fork 23 is descending in the rear tilt state", and issues a reproduction instruction when the fork 23 is rising in the forward tilt state or when the fork 23 is rising in the rear tilt state.

[0111] [Warning for forgetting to lower the claws] The screens S119 and S120 are screens for validating or invalidating the definition of a dangerous act (warning for forgetting to lower the claws). The definition of the dangerous act (warning for forgetting to lower the claws) includes "with load when the key is off" as a determination condition for the warning for forgetting to lower the claws. When the said definition (determination condition) is satisfied, the voice alert unit 2 reproduces warning voice data "Have you forgotten to lower the claws?" as a voice alert.

[0112] When the "key switch is in the key-off state and the load exceeds the sixth threshold value", the second control unit 50 determines that the determination condition for the warning of forgetting to lift the claw is satisfied. The sixth threshold value is set separately from the above load threshold value, and is set to a value that can distinguish between the state with load and the state without load, similar to the fifth threshold value, or is set to a value that can distinguish between the state where the fork 23 is grounded and the state where the fork 23 is not grounded. For example, when the load in the state where the unloaded fork 23 is not grounded is 0 [kg], the load in the state where the unloaded fork 23 is grounded becomes a negative value. Therefore, the sixth threshold value is set to a value greater than the negative value and less than 0.

[0113] On the screen S119, the item "Administrator Settings" is displayed in the menu area A1, sub-items including "Warning for Forgetting to Lift the Claw" are displayed in the sub-menu area A2, and the cursor is placed on "Warning for Forgetting to Lift the Claw". On the screen S120, the item "Warning for Forgetting to Lift the Claw" is displayed in the menu area A1, and "ON", "OFF", and the cursor are displayed in the ON / OFF setting area A4.

[0114] When set to "ON" on the screen S120, the second control unit 50 activates the definition of the dangerous act (warning for forgetting to lift the claw) and gives a reproduction instruction to the voice alert unit 2 when the definition is satisfied. On the other hand, when set to "OFF" on the screen S120, the second control unit 50 deactivates the definition of the dangerous act (warning for forgetting to lift the claw) and does not give a reproduction instruction to the voice alert unit 2. Note that on the screen S120, instead of displaying the ON / OFF setting area A4, a threshold area A5 for changing the sixth threshold value [kg] may be displayed.

[0115] [Warning for Load Drop] The screens S121 and S122 are for activating or deactivating the definition of the dangerous act (warning for load drop). The definition of the dangerous act (warning for load drop) includes, as the determination condition for the load drop warning, "no handling operation and the load (load exceeding the load threshold value) decreases by a predetermined amount (for example, 1 / 4) or more". When the definition (determination condition) is satisfied, the voice alert unit 2 reproduces the warning voice data "The load has fallen" as a voice alert.

[0116] On the screen S121, an item of "Administrator Settings" is displayed in the menu area A1, sub-items including "Load Drop Warning" are displayed in the sub-menu area A2, and the cursor is placed on "Load Drop Warning". On the screen S122, an item of "Load Drop Warning" is displayed in the menu area A1, and in the ON / OFF setting area A4, "ON", "OFF", and the cursor are displayed.

[0117] When set to "ON" on the screen S122, the second control unit 50 activates the definition of the dangerous act (load drop warning) and issues a reproduction instruction to the voice alert unit 2 when the definition is satisfied. On the other hand, when set to "OFF" on the screen S122, the second control unit 50 deactivates the definition of the dangerous act (load drop warning) and does not issue a reproduction instruction to the voice alert unit 2. Note that on the screen S122, instead of displaying the ON / OFF setting area A4, a threshold area A5 for changing the above-mentioned predetermined amount (for example, 1 / 4) may be displayed.

[0118] [Insufficient Load Landing Warning] The screens S123 and S124 are for activating or deactivating the definition of the dangerous act (insufficient load landing warning). The definition of the dangerous act (insufficient load landing warning) includes, as the determination condition for the insufficient load landing warning, "when the load decreases by a predetermined amount during the loading and unloading operation, and when the backward distance of the vehicle body 10 from the time when the load decreases is within a preset second distance [m], the load decreases below the seventh threshold value [kg]". The second distance is set to a value that can determine whether the fork 23 has completely come out of the pallet of the load. The seventh threshold value is set separately from the above-mentioned load threshold value and is set to a value that can distinguish between the state with a load and the state without a load. When the above definition (determination condition) is satisfied, the voice alert unit 2 reproduces warning voice data saying "The load landing is insufficient" as a voice alert.

[0119] On screen S123, an item "Administrator Settings" is displayed in menu area A1, sub-items including "Insufficient Landing Warning" are displayed in sub-menu area A2, and the cursor is placed on "Insufficient Landing Warning". On screen S124, an item "Insufficient Landing Warning" is displayed in menu area A1, and in ON / OFF setting area A4, "ON", "OFF", and the cursor are displayed.

[0120] When set to "ON" on screen S124, the second control unit 50 activates the definition of the dangerous act (insufficient landing warning) and issues a playback instruction to the voice alert unit 2 when the definition is met. On the other hand, when set to "OFF" on screen S124, the second control unit 50 deactivates the definition of the dangerous act (insufficient landing warning) and does not issue a playback instruction to the voice alert unit 2. Note that on screen S124, instead of displaying the ON / OFF setting area A4, a threshold area A5 for changing at least one of the seventh threshold value and the second distance may be displayed.

[0121] [Absence Warning] Screens S125 and S126 are for activating or deactivating the definition of the dangerous act (absence warning). The definition of the dangerous act (absence warning) includes, as the determination condition (absence condition) of the absence warning, "the key switch is in the key-on state and the operator leaves the driver's seat 13". When the definition (determination condition) is met, the voice alert unit 2 plays warning voice data "Please sit correctly" as a voice alert.

[0122] On screen S125, an item "Administrator Settings" is displayed in menu area A1, sub-items including "Absence Warning" are displayed in sub-menu area A2, and the cursor is placed on "Absence Warning". On screen S126, an item "Absence Warning" is displayed in menu area A1, and in ON / OFF setting area A4, "ON", "OFF", and the cursor are displayed.

[0123] When set to "ON" on screen S126, the second control unit 50 activates the definition of a dangerous act (absence warning) and issues a playback instruction to the voice alert unit 2 when the definition is satisfied. On the other hand, when set to "OFF" on screen S126, the second control unit 50 deactivates the definition of a dangerous act (absence warning) and does not issue a playback instruction to the voice alert unit 2.

[0124] [Seat Belt Warning] Screens S127 and S128 are screens for activating or deactivating the definition of a dangerous act (seat belt warning). The definition of a dangerous act (seat belt warning) includes, as the determination condition (first seat belt condition) for the seat belt warning, "seat belt not fastened and during a driving operation or a loading / unloading operation". When the said definition (determination condition) is satisfied, the voice alert unit 2 plays back warning voice data saying "Please fasten your seat belt" as a voice alert.

[0125] On screen S127, an item "Administrator Settings" is displayed in the menu area A1, sub-items including "Seat Belt Warning" are displayed in the sub-menu area A2, and the cursor is aligned with "Seat Belt Warning". On screen S128, an item "Seat Belt Warning" is displayed in the menu area A1, and "ON", "OFF", and a cursor are displayed in the ON / OFF setting area A4.

[0126] When set to "ON" on screen S128, the second control unit 50 activates the definition of a dangerous act (seat belt warning) and issues a playback instruction to the voice alert unit 2 when the definition is satisfied. On the other hand, when set to "OFF" on screen S128, the second control unit 50 deactivates the definition of a dangerous act (seat belt warning) and does not issue a playback instruction to the voice alert unit 2.

[0127] In addition, the definition of a dangerous act (seat belt warning) may include, as a determination condition for the seat belt warning (second seat belt condition), "the seat belt is fastened and the operator leaves the driver's seat 13". The sensor unit 30 detects whether the seat belt is fastened or not, for example, based on whether the tongue plate of the seat belt is correctly inserted into the buckle. Therefore, even if the operator leaves the driver's seat 13, there is a possibility that it may be determined that the seat belt is fastened. In this regard, by setting the determination condition for the seat belt warning (second seat belt condition) as described above and performing a voice alert, it is possible to suppress a dangerous act called so-called seat belt wearing disguise (improper seat belt wearing).

[0128] [Voice alert volume] Screens S129 and S130 are screens for changing or invalidating the definition of a dangerous act (voice alert volume). Although the voice alert volume does not directly correspond to a dangerous act, if the volume of the voice alert is too low, there is a risk that other dangerous acts cannot be avoided. Therefore, in the present invention, the voice alert volume is included in the dangerous act.

[0129] On screen S129, an item "Administrator settings" is displayed in menu area A1, sub-items including "Voice alert volume" are displayed in sub-menu area A2, and the cursor is placed on "Voice alert volume". On screen S130, an item "Voice alert volume" is displayed in menu area A1, a numerical input field and a numerical range (1 to 6 in this embodiment) are displayed in threshold area A5. A numerical value of the voice alert volume is input into the numerical input field. The numerical value can be increased or decreased by operating switches B3 and B4, and the volume of the voice alert increases as the value increases. When "--" is input into the numerical input field, the definition of the dangerous act (voice alert volume) is invalidated and no playback instruction is given. That is, all voice alerts can be stopped. Note that when invalidating, "0" may be used instead of "--".

[0130] When the numerical value of the voice alert volume is changed or invalidated by an input operation, the third control unit 60 issues a change instruction. Upon receiving the change instruction, the second control unit 50 issues a playback instruction (instruction) for changing or invalidating the numerical value of the voice alert volume. Upon receiving the playback instruction (instruction), the voice alert unit 2 changes or invalidates the numerical value of the voice alert volume.

[0131] [Heat stroke caution] FIG. 11 shows screens S201 and S202 that are displayed on the display unit 4A and are for changing or invalidating the definition of a dangerous act (heat stroke caution). The definition of the dangerous act (heat stroke caution) includes, as a determination condition for heat stroke caution, "the temperature measured by the thermistor Th at the time of key-on is equal to or higher than the set temperature (in this embodiment, 32 [°C])". When the said definition (determination condition) is satisfied, the voice alert unit 2 plays back warning voice data saying "Please work with caution for heat stroke" as a voice alert.

[0132] On screen S201, an item "Administrator settings" is displayed in the menu area A1, sub-items including "Heat stroke caution" are displayed in the sub-menu area A2, and the cursor is placed on "Heat stroke caution". On screen S202, an item "Heat stroke caution" is displayed in the menu area A1, and in the ON / OFF setting area A4, "ON", "OFF", and a cursor are displayed.

[0133] When set to "ON" on screen S202, the second control unit 50 validates the definition of the dangerous act (heat stroke caution) and issues a playback instruction to the voice alert unit 2 when the definition is satisfied. On the other hand, when set to "OFF" on screen S202, the second control unit 50 invalidates the definition of the dangerous act (heat stroke caution) and does not issue a playback instruction to the voice alert unit 2. Note that on screen S202, instead of displaying the ON / OFF setting area A4, a threshold area A5 for changing the set temperature may be displayed, or a condition setting area A6 for changing the timing condition of "at the time of key-on" may be displayed.

[0134] As described above, embodiments of the cargo handling vehicle according to the present invention have been explained, but the present invention is not limited to the above embodiments.

[0135] The cargo handling vehicle according to the present invention includes a vehicle body provided with a cargo handling device, an audio alert unit that reproduces at least one warning audio data to give an audio warning, a control unit that controls the vehicle body and the audio alert unit, and a temperature sensor that outputs a measurement signal related to temperature to the control unit. The control unit includes a first control unit that performs a control operation of the vehicle body, and a second control unit that sets a definition of a dangerous act and gives an instruction to reproduce warning audio data to the audio alert unit when the definition is satisfied. If the definition includes a determination condition that the temperature measured by the temperature sensor is equal to or higher than a preset temperature, the configuration can be changed as appropriate.

[0136] In the above embodiment, the combination of the menu area A1 and the ON / OFF setting area A4, the threshold value area A5, or the condition setting area A6 can be changed as appropriate. When "--" is entered in the numerical input field of the threshold value area A5, there is no reproduction instruction, but the display when no numerical value is entered (the above "--") can be changed as appropriate. Also, the content of the audio alert (the content of the warning audio data) can be changed as appropriate.

[0137] In the above embodiment, for example, the screens S101 to S130, S201, and S202 have been described as administrator setting screens, but at least some of the screens S101 to S130, S201, and S202 may be service setting screens that are not operable by an operator but are configured to be operable by a service technician (customer engineer). That is, the access level of the setting screen for changing and / or invalidating the definition of a dangerous act can be set for each dangerous act.

[0138] In the above embodiment, the thermistor Th is provided inside the second control unit 50. However, the thermistor Th can be arranged at any location of the forklift 1. However, by arranging the thermistor Th in the second control unit 50, the processing unit 53 of the second control unit 50 can perform temperature recording processing, playback instruction processing, and overheat protection processing using the measurement signal of the thermistor Th.

[0139] For the temperature sensor of the present invention, any sensor other than the thermistor Th can be used as long as it can directly or indirectly measure the temperature (ambient temperature). Further, in the above embodiment, the determination condition for heat stroke caution is set to "the temperature measured by the thermistor Th at the time of key-on is equal to or higher than the set temperature". However, the determination condition can be set to "the temperature measured by the temperature sensor is equal to or higher than the set temperature".

[0140] As described above, when the timing condition of "at the time of key-on" is excluded from the determination condition for heat stroke caution, if the temperature is lower than the set temperature at the time of key-on, the above definition (the determination condition for heat stroke caution) is not satisfied. On the other hand, even if the temperature is lower than the set temperature at the time of key-on, if the temperature becomes equal to or higher than the set temperature after a predetermined time has elapsed since the key-on, the above definition (the determination condition for heat stroke caution) is satisfied at that time. In this case, it is preferable that the second control unit 50 gives a playback instruction to the voice alert unit 2 when the traveling operation of the vehicle body 10 and / or the loading and unloading operation of the loading and unloading device 20 are not being performed. Thereby, it is possible to give a warning regarding heat stroke without disturbing the work of the operator.

[0141] In the above embodiment, the cargo handling vehicle of the present invention has been described by taking a counterbalance type forklift as an example. However, it may be a reach type forklift or another type of forklift. Further, the cargo handling vehicle of the present invention is not limited to a forklift, and may be a vehicle other than a forklift (for example, a transport vehicle) as long as it is equipped with a cargo handling device capable of lifting and lowering operations.

Description of Reference Numerals

[0142] 1 Forklift 2 Voice alert unit 3 Warning unit 4 Display 4A Display section 4B Input section 10 Vehicle body 11 Front wheel 12 Rear wheel 13 Driver's seat 14 Accelerator 15 Brake 16 Steering wheel 17 Cargo handling operation unit 18 Head guard 20 Cargo handling device 21 Mast 22 Lift bracket 23 Fork 24 Backrest 25 Tilt cylinder 26 Lift cylinder 30 Sensor section 31 Load sensor 32 Vehicle speed sensor 33 Turning angle sensor 34 Accelerator sensor 35 Brake sensor 40 First control unit 50 Second control unit 60 Third control unit

Claims

1. A vehicle body provided with a loading device, a voice alert unit that plays at least one warning voice data to give a voice warning, a control unit that controls the vehicle body and the voice alert unit, a temperature sensor that outputs a measurement signal related to temperature to the control unit, and a loading vehicle comprising: the control unit includes a first control unit that performs a control operation of the vehicle body, and a second control unit that sets a definition of a dangerous act and gives a reproduction instruction of the warning voice data to the voice alert unit when the definition is satisfied, wherein the definition is that the temperature measured by the temperature sensor is equal to or higher than a preset temperature, a key switch provided on the vehicle body, and a power supply unit that supplies a power supply voltage to at least a part of the control unit when the key switch is in the key-on state, the second control unit determines whether the definition is satisfied when the key switch is turned on, when the temperature is lower than the preset temperature when the key is turned on and the temperature becomes equal to or higher than the preset temperature and the definition is satisfied after a predetermined time has elapsed since the key was turned on, the second control unit gives the reproduction instruction when the running operation of the vehicle body and / or the loading operation of the loading device are not being performed. A loading vehicle characterized by the above.

2. A vehicle body provided with a loading device, a voice alert unit that plays at least one warning voice data to give a voice warning, a control unit that controls the vehicle body and the voice alert unit, a temperature sensor that outputs a measurement signal related to temperature to the control unit, and a loading vehicle comprising: the control unit includes a first control unit that performs a control operation of the vehicle body, and a second control unit that sets a definition of a dangerous act and gives a reproduction instruction of the warning voice data to the voice alert unit when the definition is satisfied, wherein the definition is that the temperature measured by the temperature sensor is equal to or higher than a preset temperature, and includes a display including a display unit and an input unit, the control unit includes a third control unit that controls the display, the third control unit causes the display unit to display an ON / OFF setting screen for switching between ON setting and OFF setting of the definition, the second control unit gives the reproduction instruction when the definition is in the ON setting, while not giving the reproduction instruction when the definition is in the OFF setting. A loading vehicle characterized by the above.

3. A vehicle body provided with a loading device, An audio alert unit that plays at least one warning audio data to give an audio warning; A control unit that controls the vehicle body and the audio alert unit; A temperature sensor that outputs a measurement signal related to temperature to the control unit; A cargo vehicle comprising: The control unit includes: A first control unit that performs a control operation of the vehicle body; A second control unit that sets a definition of a dangerous act and gives a reproduction instruction of the warning audio data to the audio alert unit when the definition is satisfied; The definition is that the temperature measured by the temperature sensor is equal to or higher than a preset temperature; It is provided with a head guard including pillars and a roof; The temperature sensor is a thermistor; The second control unit includes the thermistor, a processing unit, and a storage unit, and is attached to the pillar; The processing unit: A temperature recording process of acquiring the measurement signal of the thermistor and storing the temperature in the storage unit at a predetermined cycle; A reproduction instruction process of giving the reproduction instruction when the temperature is equal to or higher than the preset temperature; When the temperature is equal to or higher than a protection temperature higher than the preset temperature, a thermal protection process of restricting the operation of the second control unit is performed. A cargo vehicle characterized by the above.

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