JP5382751B2 - Picking forklift safety device - Google Patents

Description

  The present invention relates to a safety device that prevents and prevents an operator who rides in a cockpit of a picking forklift from falling from the cockpit, and a picking forklift equipped with the safety device.

  The picking forklift 1 is a type of forklift that includes a cockpit 4 that moves up and down along a standing mast 3 and a pair of left and right forks 8 that protrude rearward from the floor surface of the cockpit 4 (see FIG. 1). In the cargo handling work by the picking forklift 1, the cockpit 4 in which the worker is placed moves to a high place, and the loading and unloading of the load B are performed at the high place. For this reason, the cockpit 4 of the picking forklift 1 is usually provided with a safety device that connects the operator and the cockpit 4 with the safety belt 12 to prevent and prevent the operator from falling from the cockpit 4. Yes.

  As such a safety device, for example, one disclosed in Patent Document 1 is known. In this safety device, it is determined whether or not the hook provided at the tip of the safety belt extending from the belt worn by the worker is correctly connected to the safety bar provided on the ceiling of the cockpit. If it is determined, an alarm is issued. As a result, forgetting to connect the hook and the safety bar is prevented, and the safety of the worker is ensured.

JP 2004-18212 A

  However, the conventional safety device described above does not detect the state that “the hook and the safety bar are connected, but the belt is not worn by the operator”, so it does not like being restrained by a safety belt. As a result, a worker trying to carry out cargo handling work without wearing a belt was discovered, and could not be directed to correctly attach the belt. For this reason, the conventional safety device cannot sufficiently prevent and prevent an operator's fall accident.

  The present invention has been made in view of the above circumstances, and the problem is that a safety device that can more reliably prevent and prevent an operator from falling from the cockpit of a picking forklift, and the safety device. It is an object to provide a picking forklift provided.

In order to solve the above problems, engaging Ru safety device of the present invention, the operator boarding the cockpit picking forklift A safety device for preventing and preventing to fall from the maneuvering room, the operator Conductive safety having a conductive belt to be mounted, one end connected to the belt via a coupling fitting provided with play, and the other end insulatively connected to the cockpit frame The band is electrically connected to the other end of the safety band, detects the incidental capacitance associated with one end of the safety band, and is associated with the first threshold capacitance set in advance based on the operator's capacitance. A capacitance comparing unit that compares a second threshold capacitance set in advance based on the capacitance and the capacitance of the cockpit frame and the associated capacitance; and the first threshold capacitance and the associated capacitance Judgment period in which magnitude relationship is preset And whether changes during, characterized by comprising a vehicle control unit for changing the operating state of the picking truck according to the second threshold capacitance and the magnitude relationship of associated capacitance, a.

In this configuration, since the end of the safety belt and the belt are connected via the coupling fitting provided with play, when the worker wearing the belt moves, the end of the safety belt and the belt are affected by the influence. May be in contact or non-contact. For this reason, when the belt is correctly attached, the incidental capacitance associated with one end of the safety belt is a large value including the worker's capacitance (a value exceeding the first threshold capacitance) and the worker's capacitance. It always changes between a small value that does not include (a value that does not exceed the first threshold capacity). On the other hand, when the belt is not correctly worn, the magnitude relationship between the accompanying electrostatic capacity and the first threshold capacity does not change. In other words, in this configuration, if the magnitude relationship between the accompanying capacitance and the first threshold capacitance continues to change, the operator is likely to be wearing the belt correctly. If the magnitude relationship of the first threshold capacity does not change, it can be said that there is a high possibility that the operator does not wear the belt correctly.

According to this configuration, since the vehicle control unit changes the operation state of the picking forklift based on the magnitude relationship between the accompanying electrostatic capacity and the first threshold capacity, the cockpit is likely to be in the case where the belt is not correctly attached. An operator's fall accident can be prevented and prevented by stopping the raising / lowering of the operator.

In addition, according to this configuration, the first threshold capacity set in advance based on the electrostatic capacity of the operator and the magnitude relationship between the accompanying electrostatic capacity, and the electrostatic capacity of the cockpit frame are set in advance. Since the vehicle control unit changes the operating state of the picking forklift based on the magnitude relationship between the second threshold capacity and the accompanying capacitance , the belt is correctly compared with the case where the operating state of the picking forklift is changed only based on the former. It is possible to more reliably determine whether it is attached.

  More specifically, according to this configuration, the belt is hung on an appropriate position of the frame, and some vibration is applied to the belt, so that the belt and the frame or one end of the safety belt and the belt are in contact with each other. When the belt is correctly mounted in a non-contact state, such as when the magnitude relationship between the first threshold capacitance and the accompanying capacitance and the magnitude relationship between the second threshold capacitance and the accompanying capacitance are switched simultaneously. It is possible to prevent wrong judgments from being made.

Capacitance comparison of the upper Symbol safety device, for example, when the concomitant electrostatic capacitance exceeds the first threshold capacitance switching from off to on, accompanying capacitance is switched from ON to OFF when below a first threshold capacitance A first capacitance switch; a second capacitance switch that switches from off to on when the associated capacitance exceeds a second threshold capacitance; and that switches from on to off when the associated capacitance falls below the second threshold capacitance; Can be configured.

  When the capacitance comparison unit is configured by a capacitance switch, (1) when the vehicle control unit does not switch during the determination period, and when the second capacitance switch is in the determination period. The hydraulic system that raises or lowers the cockpit is disabled, or (2) the vehicle control unit switches the first capacitance switch during the determination period and 2. Only when the capacitance switch is kept off during the determination period, the hydraulic system for raising and lowering the cockpit can be operated to reliably prevent and prevent the operator from falling. it can.

Upper Symbol safety device may further comprise a conductively to the other end of the safety belt connected safety Obimaki jump. In addition, when fixing a safety belt winding part to the frame of a cockpit, it is necessary to interpose an insulating member between a safety belt winding part and a frame.

Further, in order to solve the above problems, picking forklift according to the present invention is characterized by having a top Symbol safety device.

  ADVANTAGE OF THE INVENTION According to this invention, the safety device which can prevent and prevent more reliably that an operator falls from the cockpit of a picking forklift, and a picking forklift provided with this safety device can be provided.

It is a side view of the picking forklift provided with the safety device concerning the present invention. It is a block diagram of the safety device concerning the 1st example of the present invention. It is a circuit diagram of the electrostatic capacitance comparison part with which the safety device which concerns on 1st Example was equipped. It is a graph which shows a specific example of operation | movement of the safety device which concerns on 1st Example. It is a block diagram of the safety device which concerns on 2nd Example of this invention. It is a circuit diagram of the electrostatic capacitance comparison part with which the safety device which concerns on 2nd Example was equipped. It is a graph which shows a specific example of operation | movement of the safety device which concerns on 2nd Example.

  Hereinafter, embodiments of a safety device and a picking forklift according to the present invention will be described with reference to the accompanying drawings.

[First embodiment]
FIG. 1 shows a picking forklift according to the present invention. As shown in the figure, a picking forklift (hereinafter simply referred to as a forklift) 1 includes a vehicle main body 2 that houses a traveling motor and the like, a mast 3 that stands up behind the vehicle main body 2, A cockpit 4 that moves up and down along with a pair of left and right forks 8 that protrudes rearward from the floor surface of the cockpit 4. The cockpit 4 has a metal frame including a floor frame 5, a front frame 6 and a ceiling frame 7 which are integrally formed, and an operation panel 9 provided on the front frame 6. The operation panel 9 is provided with a handle and a lever for instructing the traveling of the forklift 1 and the raising / lowering of the cockpit 4 in addition to a key switch for starting the forklift 1.

  The forklift 1 also includes a belt 11, a safety belt 12, and a safety belt winding unit 13 that constitute a safety device. The belt 11 is to be worn around the waist of an operator boarding the cockpit 4, and all or a part thereof is made of a conductive material. In addition, one end of the safety belt 12 is detachably attached to the belt 11 via, for example, a hook-shaped connection fitting.

  Appropriate play is provided in the connecting bracket. For this reason, one end of the safety belt 12 and the belt 11 are brought into a contact state or a non-contact state. For example, when a certain amount of tension is applied to the connection fitting, one end of the safety belt 12 and the belt 11 are in contact with each other. At this time, one end of the safety belt 12 and the belt 11 are electrically connected. On the other hand, when no tension is applied to the connection fitting, one end of the safety belt 12 and the belt 11 are likely to be in a non-contact state, that is, an electrically insulated state.

  All or part of the safety belt 12 is made of a conductive material, and has conductivity throughout the entire length. The safety belt winding unit 13 is electrically connected to the other end of the safety belt 12 and is insulatively attached to the ceiling frame 7 of the cockpit 4. From the safety belt winding unit 13, a portion from the end of the safety belt 12 to about 1 m is always drawn, and when a tension is applied, the remaining portion is drawn according to the tension.

  As a configuration for imparting conductivity to a part of the belt 11 and the safety belt 12, for example, it is considered that a conductive material is sewn or knitted into a fiber material that does not have conductivity.

  FIG. 2 shows a block diagram of the safety device according to the first embodiment provided in the forklift 1. As shown in the figure, a safety device 10A according to the present embodiment includes a belt 11, a conductive safety belt 12 having one end connected to the belt 11 via a connection fitting provided with play, and a safety belt. And a safety belt winding unit 13 electrically connected to the other end of 12. The safety belt winding unit 13 is attached to the ceiling frame 7 via an appropriate insulating unit 14.

  The safety device 10 </ b> A further includes a capacitance comparison unit 15 and a vehicle control unit 20. The capacitance comparison unit 15 includes one capacitance switch 16, and an input terminal (IN terminal shown in FIG. 3) of the capacitance switch 16 is conductively connected to the safety belt winding unit 13. On the other hand, the output terminal (OUT terminal) of the capacitance switch 16 is connected to the vehicle control unit 20.

  The capacitance switch 16 detects the capacitance of an object that is conductively connected to the input terminal. For example, when the connecting metal fitting is in contact and the belt 11 is attached to the worker, the capacitance switch 16 includes the safety belt winding unit 13, the safety belt 12, the belt 11, and the total number of workers. Detect the capacitance. On the other hand, when the connecting metal fitting is in a contact state and the belt 11 is not worn by the operator, the capacitance switch 16 is a total capacitance of the safety belt winding unit 13, the safety belt 12, and the belt 11. Is detected. When the connecting metal fitting is in a non-contact state, the electrostatic capacity switch 16 is connected to the total safety of the safety belt winding unit 13 and the safety belt 12 regardless of whether or not the belt 11 is attached to the worker. Detect capacity.

  When the belt 11 is hung on some suitable place (for example, a frame), the electrostatic capacity switch 16 is not the electrostatic capacity of the operator but the static of the frame (the floor frame 5, the front frame 6, and the ceiling frame 7). Detect total capacitance including capacitance.

  The electrostatic capacity of the safety belt take-up unit 13 itself, the electrostatic capacity of the safety belt 12 itself, and the electrostatic capacity of the belt 11 itself are extremely small (substantially zero). The capacitance is eventually the worker's capacitance, the frame capacitance or zero. In the present specification, the capacitance associated with one end of the safety belt 12 is referred to as “accompanying capacitance C”. As described above, since the electrostatic capacity of the belt 11 itself is substantially zero, the accompanying electrostatic capacity C is the electrostatic capacity of the operator, the electrostatic capacity of the frame, or zero.

  FIG. 3 is a circuit diagram of the capacitance comparison unit 15. As shown in the figure, the capacitance switch 16 includes a detection unit 16a that outputs a high level or low level signal according to the associated capacitance C, a base connected to the output of the detection unit 16a, and a collector connected to the output. It has an NPN transistor 16b connected to the OUT terminal and a diode 16c that prevents overvoltage at the OUT terminal.

  When the accompanying capacitance C exceeds a preset threshold capacitance C1, the detection unit 16a outputs a high level signal, whereby the transistor 16b is turned on, and the vehicle control unit 20 switches to the capacitance switch 16. Current paths are formed. On the other hand, when the accompanying electrostatic capacitance C is lower than the threshold capacitance C1, the detection unit 16a outputs a low level signal, so that the transistor 16b is not turned on and a current path is not formed.

In this embodiment, the threshold capacitance C1 is set to 55 pF, which is about 10% lower than the capacitance (60 pF) of a general worker (human body). For this reason,
(1) If the accompanying capacitance C is below 55 pF,
-Capacitance switch 16 (transistor 16b): off (2) When the accompanying capacitance C exceeds 55 pF,
Capacitance switch 16 (transistor 16b): Turns on.

  The vehicle control unit 20 includes one or a plurality of microprocessors (MPUs), and the alarm unit 22 and the traveling according to the state of the capacitance switch 16 during a preset determination period (for example, 5 seconds). System 23 and hydraulic system 24 are controlled.

  Specifically, the vehicle control unit 20 determines that the belt 11 is not worn by the operator when the capacitance switch 16 is kept off during the determination period, and the traveling system 23 and the hydraulic system. 24 is disabled. When the traveling system 23 becomes inoperable, the forklift 1 does not travel even if the operation panel 9 is operated. When the hydraulic system 24 becomes inoperable, the cockpit 4 does not move up and down even if the operation panel 9 is operated.

  Further, the vehicle control unit 20 determines that the belt 11 is worn by the operator when the capacitance switch 16 is switched from on to off or from off to on at least once during the determination period. The travel system 23 and the hydraulic system 24 are made operable. As a result, the forklift 1 can be run and the cockpit 4 can be moved up and down.

  When the capacitance switch 16 is kept on during the determination period, the vehicle control unit 20 pretends that the belt 11 is put on an appropriate place where the belt 11 is stable. The traveling system 23 and the hydraulic system 24 are made inoperable, and the alarm unit 22 made of an acoustic device or a light emitting device is activated. As described above, if the hydraulic system 24 becomes inoperable, the cockpit 4 cannot be raised, so that the operator cannot perform work at a high place. Further, when the alarm unit 22 is activated, it is known that not only the operator himself but also the surrounding people are not wearing the belt 11 correctly.

  The vehicle control unit 20 controls the monitoring unit 21 that stores the fact that the belt 11 has not been correctly attached, and transmits the fact to the monitoring center that centrally monitors the state of the plurality of forklifts including the forklift 1. It is preferable. Thereby, the effect which prevents a worker's fall further increases.

  The vehicle control unit 20 also controls the traveling system 23 and the hydraulic system 24 based on instructions from the operator received by the operation panel 9.

  With reference to FIG. 4, the operation of the safety device 10A according to the present embodiment will be described in more detail.

  In the determination period P1, the capacitance switch 16 remains off without being switched from on to off or from off to on. Therefore, the vehicle control unit 20 determines that the belt 11 is not worn by the worker, and disables the traveling system 23 and the hydraulic system 24 during the next determination period P2. Since the situation does not change even during the determination period P2, the vehicle control unit 20 disables the traveling system 23 and the hydraulic system 24 during the next determination period P3.

  Thereafter, the same determination is made, and the traveling system 23 and the hydraulic system 24 are disabled until the determination period P5 ends (until time t1).

  In the determination period P5, the capacitance switch 16 is switched. Therefore, the vehicle control unit 20 determines that the belt 11 is worn by the worker, and enables the traveling system 23 and the hydraulic system 24 during the next determination period P6. Since the situation does not change during the determination period P6, the vehicle control unit 20 enables the traveling system 23 and the hydraulic system 24 to operate during the next determination period P7.

  Thereafter, the same determination is made, and the traveling system 23 and the hydraulic system 24 are operable until the determination period P11 ends (until time t2).

  In the determination period P11, the capacitance switch 16 remains on without being switched from on to off or from off to on. Therefore, the vehicle control unit 20 determines that the operator is pretending to wear the belt 11, and disables the traveling system 23 and the hydraulic system 24 during the next determination period P12, and sets the alarm unit 22 Operate. Since the situation does not change during the determination period P12, the vehicle control unit 20 disables the traveling system 23 and the hydraulic system 24 and activates the alarm unit 22 during the next determination period P13.

  As described above, according to the safety device 10A according to the present embodiment, when the capacitance switch 16 is switched within the determination period (when the magnitude relationship between the accompanying capacitance C and the threshold capacitance changes), the traveling system. 23 and the hydraulic system 24 can be operated. In other cases, the traveling system 23 and the hydraulic system 24 are disabled. Therefore, it is possible to prevent and prevent the operator from falling.

  Moreover, according to the safety device 10A according to the present embodiment, it is determined that the worker is pretending to wear the belt 11 when the capacitance switch 16 is kept on within the determination period. Since the alarm device 22 operates, a higher fall prevention effect and fall prevention effect than the conventional safety device are obtained.

[Second Embodiment]
FIG. 5 shows a block diagram of a safety device according to the second embodiment provided in the forklift 1. As shown in the figure, a safety device 10B according to the present embodiment includes a belt 11, a conductive safety belt 12 having one end connected to the belt 11 via a connection fitting provided with play, and a safety belt. And a safety belt winding unit 13 electrically connected to the other end of 12. The safety belt winding unit 13 is attached to the ceiling frame 7 via an appropriate insulating unit 14.

  The safety device 10B further includes a capacitance comparison unit 15 and a vehicle control unit 20. The capacitance comparison unit 15 includes two capacitance switches (a first capacitance switch 16 and a second capacitance switch 17), and input terminals (IN shown in FIG. 6) of the capacitance switches 16 and 17. Terminal) is conductively connected to the safety belt winding unit 13. On the other hand, output terminals (OUT terminals) of the capacitance switches 16 and 17 are connected to the vehicle control unit 20.

  Capacitance switches 16 and 17 detect the capacitance of an object that is conductively connected to the input terminal. For example, when the connecting metal fitting is in contact and the belt 11 is attached to the worker, the capacitance switches 16 and 17 are the safety belt winding unit 13, the safety belt 12, the belt 11, and the worker. To detect the total capacitance. On the other hand, when the connecting metal fittings are in contact and the belt 11 is not worn by the operator, the capacitance switches 16 and 17 are configured so that the safety belt winding unit 13, the safety belt 12 and the belt 11 are fully static. Detect capacitance. When the connecting metal fitting is in a non-contact state, the capacitance switches 16 and 17 are connected to the safety belt winding unit 13 and the safety belt 12 regardless of whether or not the belt 11 is attached to the operator. Detect the capacitance.

  When the belt 11 is hung on some appropriate place (for example, a frame), the capacitance switches 16 and 17 are not the operator's capacitance but the frame (the floor frame 5, the front frame 6 and the ceiling frame 7). The total capacitance including the capacitance is detected.

  The electrostatic capacity of the safety belt winding unit 13 itself, the electrostatic capacity of the safety belt 12 itself, and the electrostatic capacity of the belt 11 itself are extremely small (substantially zero), and are detected by the electrostatic capacity switches 16 and 17. The total capacitance will eventually be the operator's capacitance, the frame capacitance or zero.

  FIG. 6 is a circuit diagram of the capacitance comparison unit 15. As shown in the figure, the first capacitance switch 16 includes a detection unit 16a that outputs a high level or low level signal according to the associated capacitance C, and a base connected to the output of the detection unit 16a. It has an NPN transistor 16b whose collector is connected to the OUT terminal, and a diode 16c that prevents overvoltage at the OUT terminal.

  When the accompanying electrostatic capacity C exceeds a preset first threshold capacity C1, the detection unit 16a outputs a high level signal, whereby the transistor 16b is turned on, and the vehicle control unit 20 outputs the first electrostatic capacity. A current path to the capacitive switch 16 is formed. On the other hand, when the accompanying electrostatic capacitance C is lower than the first threshold capacitance C1, the detection unit 16a outputs a low level signal, so that the transistor 16b is not turned on and a current path is not formed.

  The second capacitance switch 17 has the same basic configuration as the first capacitance switch 16. That is, the second capacitance switch 17 includes a detection unit 17a that outputs a high level signal or a low level signal, and an NPN transistor 17b that has a base connected to the output of the detection unit 17a and a collector connected to the OUT terminal. And a diode 17c for preventing overvoltage at the OUT terminal.

  When the accompanying electrostatic capacity C exceeds the preset second threshold capacity C2, the detection unit 17a outputs a high level signal, whereby the transistor 17b is turned on, and the vehicle control unit 20 outputs the second electrostatic capacity. A current path to the capacitive switch 17 is formed. On the other hand, when the accompanying electrostatic capacitance C is lower than the second threshold capacitance C2, the detection unit 17a outputs a low level signal, so that the transistor 17b is not turned on and a current path is not formed.

In the present embodiment, the first threshold capacitance C1 is set to 55 pF, which is about 10% lower than the capacitance (60 pF) of a general worker (human body). The second threshold capacitance C2 is 90 pF, which is 10% lower than the frame capacitance (100 pF). For this reason,
(1) If the accompanying capacitance C is below 55 pF,
First capacitance switch 16 (transistor 16b): off Second capacitance switch 17 (transistor 17b): off (2) When the accompanying capacitance C is in the range of 55 to 90 pF,
First capacitance switch 16 (transistor 16b): ON Second capacitance switch 17 (transistor 17b): OFF (3) When the accompanying capacitance C exceeds 90 pF,
First capacitance switch 16 (transistor 16b): ON Second capacitance switch 17 (transistor 17b): ON

  The vehicle control unit 20 includes one or a plurality of microprocessors (MPUs), and the first capacitance switch 16 and the second capacitance switch 17 during a predetermined determination period (for example, 5 seconds). The alarm unit 22, the traveling system 23, and the hydraulic system 24 are controlled according to the state.

  Specifically, when the first capacitance switch 16 and the second capacitance switch 17 are kept off during the determination period, the vehicle control unit 20 does not wear the belt 11 to the operator. And the traveling system 23 and the hydraulic system 24 are disabled.

  Further, the vehicle control unit 20 switches the first capacitance switch 16 from on to off or from off to on at least once during the determination period, and the second capacitance switch 17 continues to be off. In this case, it is determined that the belt 11 is worn by the operator, and the traveling system 23 and the hydraulic system 24 are made operable.

  Even if the first capacitance switch 16 is switched, if the second capacitance switch 17 is not kept off, the travel system 23 and the hydraulic system 24 are not operable. Since some vibration is applied to the belt 11 hung at an appropriate position of the frame, the belt 11 and the frame, or the belt 11 and one end of the safety belt 12 are in a contact state or a non-contact state. That is, it is considered that the worker is pretending to wear the belt 11.

  In this case, the vehicle control unit 20 disables the traveling system 23 and the hydraulic system 24 and activates the alarm unit 22. As described above, if the hydraulic system 24 becomes inoperable, the cockpit 4 cannot be raised, so that the operator cannot perform work at a high place. Further, when the alarm unit 22 is activated, it is known that not only the operator himself but also the surrounding people are not wearing the belt 11 correctly.

  Even when the first capacitance switch 16 is kept on during the determination period, the vehicle control unit 20 determines that the worker is pretending to wear the belt 11, and the traveling system 23 and the hydraulic system. 24 is disabled and the alarm unit 22 is activated.

  The vehicle control unit 20 controls the monitoring unit 21 that stores the fact that the belt 11 has not been correctly attached, and transmits the fact to the monitoring center that centrally monitors the state of the plurality of forklifts including the forklift 1. It is preferable. Thereby, the effect which prevents a worker's fall further increases.

  The vehicle control unit 20 also controls the traveling system 23 and the hydraulic system 24 based on instructions from the operator received by the operation panel 9.

  With reference to FIG. 7, the operation of the safety device 10B according to the present embodiment will be described in more detail.

  In the determination period P1, both the first capacitance switch 16 and the second capacitance switch 17 remain off. Therefore, the vehicle control unit 20 determines that the belt 11 is not worn by the worker, and disables the traveling system 23 and the hydraulic system 24 during the next determination period P2. Since the situation does not change even during the determination period P2, the vehicle control unit 20 disables the traveling system 23 and the hydraulic system 24 during the next determination period P3.

  Thereafter, the same determination is made, and the traveling system 23 and the hydraulic system 24 are disabled until the determination period P5 ends (until time t1).

  In the determination period P5, the first capacitance switch 16 is switched. On the other hand, the second capacitance switch 17 is kept off. Therefore, the vehicle control unit 20 determines that the belt 11 is worn by the worker, and enables the traveling system 23 and the hydraulic system 24 during the next determination period P6. Since the situation does not change during the determination period P6, the vehicle control unit 20 enables the traveling system 23 and the hydraulic system 24 to operate during the next determination period P7.

  In the determination period P7, the first capacitance switch 16 is switched, but the second capacitance switch 17 is not kept off. Therefore, the vehicle control unit 20 determines that the operator is pretending to wear the belt 11 and disables the traveling system 23 and the hydraulic system 24 during the next determination period P8, and the alarm device 22. Is activated. Since the situation does not change even during the determination period P8, the vehicle control unit 20 disables the traveling system 23 and the hydraulic system 24 and activates the alarm device 22 during the next determination period P9.

  In the determination period P11, the first capacitance switch 16 remains on. Therefore, the vehicle control unit 20 determines that the operator is pretending to wear the belt 11, and disables the traveling system 23 and the hydraulic system 24 during the next determination period P12, and sets the alarm unit 22 Operate. Since the situation does not change during the determination period P12, the vehicle control unit 20 disables the traveling system 23 and the hydraulic system 24 and activates the alarm unit 22 during the next determination period P13.

  As described above, according to the safety device 10B according to the present embodiment, it is determined that the worker is pretending to wear the belt 11 in the situations such as the determination periods P7 and P8. The fall of a person can be prevented and prevented.

  As mentioned above, although the Example of the safety device and picking forklift which concern on this invention was described, this invention is not limited to this structure.

  For example, in each of the above embodiments, the vehicle control unit 20 controls the monitoring unit 21, the alarm unit 22, the traveling system 23, and the hydraulic system 24. However, the fall of the worker makes the hydraulic system 24 inoperable. Can just prevent it. However, from the viewpoint of effectively preventing the operator from falling, it is preferable to also control the monitoring unit 21, the alarm unit 22, and the traveling system 23.

  Further, the safety belt winding unit 13 used in the above embodiments can be omitted. In this case, the other end of the safety band 12 and the frame (ceiling frame 7) may be directly and insulatively connected, and the other end of the safety band 12 and the capacitance comparison unit 15 may be electrically connected.

  In addition, the threshold capacitance C1 (55 pF), the first threshold capacitance C1 (55 pF), and the second threshold capacitance C2 (90 pF) in each of the above embodiments are merely examples, and can be appropriately changed within a range where no erroneous detection is performed.

  The determination period (5 seconds) in each of the above embodiments can be changed as appropriate. The determination period may be obtained experimentally by acquiring the states of the capacitance switch 16 (first capacitance switch 16) and the second capacitance switch 17 in various situations.

DESCRIPTION OF SYMBOLS 1 Picking forklift 2 Car body part 3 Mast 4 Cockpit 5 Floor frame 6 Front frame 7 Ceiling frame 8 Fork 9 Operation panel 10A, 10B Safety device 11 Belt 12 Safety belt 13 Safety belt winding part 14 Insulating part 15 Capacitance comparison Part 16 First Capacitance Switch (Capacitance Switch)
17 Second Capacitance Switch 20 Vehicle Control Unit 21 Monitoring Unit 22 Alarm Unit 23 Traveling System 24 Hydraulic System B Luggage

Claims (6)

A safety device for preventing and preventing an operator boarding a cockpit of a picking forklift from falling from the cockpit,
A conductive belt to be worn by the operator;
A conductive safety band having one end coupled to the belt via a coupling fitting provided with play and the other end insulatively connected to the cockpit frame;
The conductive belt is conductively connected to the other end of the safety belt, detects an incidental capacitance associated with one end of the safety belt, and has a first threshold capacitance set in advance based on the worker's capacitance and the A capacitance comparing unit that compares the incidental capacitance and a second threshold capacitance set in advance based on the capacitance of the cockpit frame and the incidental capacitance ;
The picking is performed according to whether or not the magnitude relationship between the first threshold capacitance and the accompanying capacitance changes during a preset determination period and the magnitude relationship between the second threshold capacitance and the accompanying capacitance. A vehicle control unit for changing the operating state of the forklift,
A safety device characterized by comprising: The capacitance comparing unit switches from off to on when the accompanying capacitance exceeds the first threshold capacitance, and switches from on to off when the accompanying capacitance falls below the first threshold capacitance. A capacitance switch and a second capacitance switch that switches from off to on when the accompanying capacitance exceeds the second threshold capacitance and switches from on to off when the accompanying capacitance falls below the second threshold capacitance safety device according to claim 1, characterized in that it consists of a. The vehicle control unit opens the cockpit when the first capacitance switch does not switch during the determination period and when the second capacitance switch does not continue to be turned off during the determination period. The safety device according to claim 2, wherein the hydraulic system for raising and lowering is disabled. The vehicle control unit changes the cockpit only when the first capacitance switch is switched during the determination period and the second capacitance switch is kept off during the determination period. The safety device according to claim 2, wherein the hydraulic system for raising and lowering is operable. Further comprising a safety belt winding part electrically connected to the other end of the safety belt,
The safety device according to any one of claims 1 to 4, wherein the safety belt winding unit is fixed to a frame of the cockpit through an insulating member . A picking forklift comprising the safety device according to any one of claims 1 to 5 .

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