JP5907525B2 - Industrial vehicle safety device - Google Patents

Description

  More particularly, the present invention relates to a safety device including a seat seating detection switch (deadman switch) that detects whether a driver is seated on a seat.

  A conventional safety device will be described with reference to the control circuit diagram of FIG. 3 and the control flowchart of FIG. If the driver's key switch 1 is ON and the driver is seated on the seat 2, the seat seating detection switch 3 having a normally open contact built in the seat portion of the seat 2 is turned ON. 4A is determined to be normal, and traveling and cargo handling operations are possible (S1 → S9, S10, S11).

  When the driver leaves the seat 2, the seat seating detection switch 3 is turned OFF, and if the OFF state is continued for a set time or longer, the control device 4A determines that there is an abnormality (S1 → S2 → S3 → S4) and moves forward. The first shut-off relay 8 and the second shut-off relay 9 shut off the energization of the solenoid valve 5 for reverse, the solenoid valve 6 for reverse travel, and the solenoid valve 7 for cargo handling device. Therefore, when the driver is not seated on the seat 2, a safety function that disables traveling and cargo handling operation is activated (S6). At this time, the control device 4A sounds an alarm buzzer 10 that audibly informs that there is an abnormality, and lights a non-seating warning lamp 11 that visually informs that the abnormality is present (S5).

  After energizing the forward solenoid valve 5, the reverse solenoid valve 6, and the cargo handling device solenoid valve 7, the driver is seated again and the seat seating detection switch 3 is turned on to detect seating. The non-seating warning light 11 is turned off and the alarm buzzer 10 is turned off (S8), the energization of the solenoid valve 7 for the cargo handling device is restored to enable the cargo handling operation (S9), and the shift lever (F / R lever) ) Is in the neutral position (S10), the energization of the forward solenoid valve 5 and the reverse solenoid valve 6 is restored to enable forward / reverse travel (S11).

  The forward solenoid valve 5 and the reverse solenoid valve 6 are solenoid valves for supplying hydraulic pressure for switching the hydraulic clutch to the forward clutch or the reverse clutch, respectively. A forward switch, a neutral position, and a reverse position are detected by a shift switch 12 that detects an input direction of a shift lever (not shown), and the forward solenoid valve 5 or the reverse solenoid valve 6 is energized according to the shift position. In the neutral position, the forward solenoid valve 5 and the reverse solenoid valve 6 are not energized. Accordingly, when the energization of the forward solenoid valve 5 and the reverse solenoid valve 6 is interrupted, the hydraulic clutch becomes neutral and the vehicle cannot travel.

  The solenoid valve 7 for the cargo handling device is a solenoid valve that controls the hydraulic pressure supplied to the hydraulic cylinder that drives the cargo handling device such as a fork. The drive hydraulic cylinder cannot be operated, and the cargo handling operation becomes impossible.

  As this type of safety device, for example, there are those disclosed in Patent Documents 1 and 2.

JP 2006-316842 A Japanese Utility Model Publication 2-51934

  In general, a seat seating detection switch is connected to an internal contact when seated, and an electrical signal (seat signal) is sent to the control device to determine that the control device is seated (normal). Since the electrical signal (sitting signal) is not sent to the control device because it is connected, the control device determines that it is not seated (abnormal).

  Therefore, if the seating signal is not sent to the control device due to failure due to poor contact of the seating detection switch or disconnection of the electrical wiring connecting the seating detection switch and the control device, the seating will be seated. In spite of this, the control device judges that it is not seated (abnormal) and disables traveling and disables the cargo handling operation.

  However, if such a situation occurs, for example, on the road, the vehicle cannot be moved, and in particular in the case of a large industrial vehicle, it is not easy to tow. Also, if the cargo handling device stops at the high head position with cargo or the like placed on it, unloading becomes difficult.

  Therefore, in order to solve the above problems, the present invention temporarily travels while ensuring a safety function as a safety device when a malfunction occurs in which the seat seating detection switch does not normally detect seating. The main object of the present invention is to provide a safety device for an industrial vehicle that enables a cargo handling operation.

  In order to achieve the above object, an industrial vehicle safety device according to the present invention provides a seat seating detection switch for detecting whether or not a driver seat is seated, a forward solenoid valve, and a reverse solenoid valve. A control device for controlling the energized state; and an emergency release switch connected to the control device, wherein the control device includes the forward solenoid when non-seating is detected by the seat seating detection switch. The forward solenoid valve and the reverse solenoid valve are turned off after it is determined that the emergency release switch is in an ON state and the number of ON operations is within a predetermined number. It is characterized in that the energization to is restored.

  The industrial vehicle safety device according to the present invention includes a seat seating detection switch that detects whether or not the driver's seat is seated, and a cargo handling device that controls supply of hydraulic oil to a hydraulic cylinder of the cargo handling device. A control device for controlling the energization state of the solenoid valve for use and an emergency release switch connected to the control device, wherein the control device detects non-seating by the seat seating detection switch In addition, the energization of the solenoid valve for the cargo handling device is cut off and the energization to the solenoid valve for the cargo handling device is restored after it is determined that the emergency release switch is in the ON state and the number of ON operations is within a predetermined number of times. It is characterized by making it.

  The industrial vehicle safety device according to the present invention includes a seat seating detection switch for detecting whether or not a driver seat is seated, a forward solenoid valve, a reverse solenoid valve, and a hydraulic cylinder of a cargo handling device. A control device for controlling the energization state of the solenoid valve for the cargo handling device for controlling the supply of hydraulic oil to the control device, and an emergency release switch connected to the control device, the control device comprising the seat seating When non-sitting is detected by the detection switch, the energization to the forward solenoid valve, the reverse solenoid valve, and the cargo handling device solenoid valve is cut off, and the emergency release switch is in an ON state. The forward solenoid valve, the reverse solenoid valve, after determining that the number of ON operations is within a predetermined number; Characterized in that to return the power supply to the serial cargo apparatus solenoid valve.

  Preferably, the control device accumulates and stores the number of ON operations of the emergency release switch, and determines whether or not the accumulated number of ON operations is within a predetermined number.

  It is preferable to further include a reset switch for resetting the stored number of integrations of the number of ON operations of the emergency release switch.

  It is preferable that the control device turns on a failure warning lamp that indicates that the seat seating detection switch is in failure when the emergency release switch is turned on.

  According to the present invention, even if a safety device that disables running or cargo handling is activated due to a malfunction such as a failure of the seat seating detection switch, the safety device can be released by the emergency release switch. The safety function of the safety device can be ensured by limiting the number of operations of the release switch.

FIG. 1 is a control circuit diagram of an embodiment of a safety device for an industrial vehicle according to the present invention. FIG. 2 is a control flowchart of the control device arranged in the control circuit of FIG. FIG. 3 is a control circuit diagram of a conventional industrial vehicle safety device. FIG. 4 is a control flowchart of the control device arranged in the control circuit of FIG.

  An embodiment of a safety device for an industrial vehicle according to the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a control circuit diagram of the safety device, and FIG. 2 is a control flowchart of the control device in the control circuit of FIG. In the following description, the same components as those in the conventional example may be denoted by the same reference numerals and redundant description may be omitted.

  The safety device for an industrial vehicle according to the present invention includes a contact release (normally open) emergency release switch 13, a reset switch 14, and a failure warning lamp 15 indicating that repair is required, connected to the control device 4, and The control flow by the control device 4 is different from the conventional example shown in FIGS.

  The emergency release switch 13, the reset switch 14, and the failure warning lamp 15 that indicates that repair is required are connected to the control device 4.

  The control device 4 determines whether or not the seat seating detection switch 3 is operating (S1), and when it is determined that the seat seating detection switch 3 is operating, that is, from the seat seating detection switch 3 When the electric signal is transmitted to the control device 4, the process proceeds to step S <b> 9 which will be described later, enabling a cargo handling operation and enabling forward / reverse travel.

  When it is determined in step S1 that the seat seating detection switch 3 is not activated, that is, when the electrical signal from the seat seating detection switch 3 is not transmitted to the control device 4, the control device 4 counts the timer. Start (S2).

  Next, the control device 4 determines whether or not the seat seating detection switch 3 is operated within 3 seconds from the start of the timer count in step S2 (S3).

  If it is determined that the seat seating detection switch 3 is activated within 3 seconds from the start of the timer count in step S2, that is, the control device 4 sends an electrical signal from the seat seating detection switch 3 within 3 seconds from the start of the timer count. If received, the control device 4 resets the timer count (S4) and returns to step S1.

  When it is determined in step S3 that the seat seating detection switch 3 is not activated within 3 seconds from the start of the timer count, that is, within 3 seconds from the start of timer count in step S2, the control device 4 moves from the seat seating detection switch 3 When the electric signal is not received, the control device 4 energizes the non-seating warning lamp 11 indicating non-seating to light it, and energizes the alarm buzzer 10 to sound it (S5). Further, the first shut-off relay 8 and the second shut-off relay 9 cut off the energization of the forward solenoid valve 5, the reverse solenoid valve 6, and the cargo handling device solenoid valve 7 to perform forward / reverse travel and cargo handling operations. Disable (S6).

  After disabling the forward / reverse travel and the cargo handling operation in step S6, the control device 4 determines whether or not the seat seating detection switch 3 is operating (S7).

  When it is determined in step S7 that the seat seating detection switch 3 is activated, the control device 4 turns off the non-seating warning lamp 11 and the alarm buzzer 10 and turns off the non-sitting warning lamp 11 to turn off the alarm buzzer. 10 is stopped (S8), the energization of the solenoid valve 7 for the cargo handling device is restored by the second cutoff relay 9 to enable the cargo handling operation (S9), and it is further determined whether or not the shift switch 12 is in the neutral position. To do. (S10).

  If it is determined in step S10 that it is not in the neutral position, the process returns to step S7. Conversely, if it is determined in step S10 that the actuator is in the neutral position, the control device 4 can return to the forward solenoid valve 5 and the reverse solenoid valve 6 by the first cutoff relay 8 to perform forward / reverse travel. (S11). Before enabling the forward / reverse running, it is determined in step S10 whether or not it is in the neutral position. When the shift lever is in the forward position or the reverse position, it is prevented that the power is suddenly turned on and suddenly started. It is to do.

  When it is determined in step S7 that the seat seating detection switch 3 is not activated, the control device 4 determines whether or not the emergency release switch 13 is in an ON state (whether it is activated) (S12).

  If it is determined in step S12 that the emergency release switch 13 is not in the ON state (not operating), the process returns to step S7. If it is determined in step S12 that the emergency release switch 13 is in an ON state (operated), the control device 4 displays a failure warning lamp 15 that indicates that the seat seating detection switch 3 has failed. The number of times the emergency release switch 13 is turned on is accumulated and stored (S14).

  It is determined whether or not the number of times the emergency release switch 13 is turned on, that is, the number of times the emergency release switch 13 is pressed is within a predetermined number of times set in advance (S15). If the predetermined number of times is exceeded, the process returns to step S7.

  Here, when the number of times the emergency release switch 13 is turned on is within a predetermined number, the handling operation and the forward / reverse travel are possible by the processing of steps S9 to S11, but step S8 is skipped. The non-seating warning lamp 11 is kept on and the alarm buzzer 10 continues to sound, and it is recognized that it is an emergency.

  As is clear from the above description, when the detection signal of the seat seating detection switch 3 is OFF, the first cutoff relay 8 and the second cutoff relay 9 are controlled by a command from the control device 4, and the forward solenoid valve 5. A safety device that disables forward / reverse travel and cargo handling operation by shutting off the energization of the reverse solenoid valve 6 and the cargo handling device solenoid valve 7 works, but the detection signal of the seat seating detection switch 3 is Even when the emergency release switch 13 is being pressed, the control device 4 returns to the forward solenoid valve 5, the reverse solenoid valve 6, and the cargo handling device solenoid valve 7 under certain conditions while the emergency release switch 13 is being pressed. Thus, the safety device can be temporarily released by enabling the forward / reverse running and the cargo handling operation.

  Therefore, since the seat seating detection switch 3 cannot send an electrical signal to the control device even though it is seated due to a failure of the seat seating detection switch 3, etc., the control device judges that it is not seated and operates the safety device. Even if it is allowed to stop, the safety device can be temporarily released to enable forward / reverse travel and cargo handling operation, thereby avoiding a stop on the aisle or a stop while using the cargo handling device. .

  Moreover, the safety | security of the conventional safety device can be ensured by restrict | limiting the frequency | count that the emergency cancellation switch 13 can be turned ON and the safety device can be released.

  When the safety device can be released as described above, that is, the control device is operated by the first and second shut-off relays 8 and 9 despite being seated, the forward solenoid valve 5, the reverse solenoid valve 6, and The control device 4 receives the ON signal of the emergency release switch 13 when the energization of the solenoid valve 7 for the cargo handling device is cut off to disable the traveling and cargo handling operations, and the first and second cutoff relays 8, 9 If the energization of the forward solenoid valve 5, the reverse solenoid valve 6, and the cargo handling device solenoid valve 7 can be restored by the control of the control device 4, the control device 4 itself has not failed. After repairing a certain seating detection switch 3 or its connection wiring, the reset switch 14 is pressed, and the number of ON operations of the emergency release switch 13 is zero. Reset. That is, the number of ON operations of the emergency release switch 13 stored in the control device 4 is deleted. Further, the non-seating warning lamp 11, the alarm buzzer 10, and the failure warning lamp 15 may be reset by the reset switch 14, that is, the extinction and the alarm buzzer may be stopped.

  As is apparent from the above description, according to the present invention, even if a safety device that disables running or cargo handling is activated due to a malfunction such as failure of the seat seating detection switch 3, the safety device is released by the emergency release switch. The safety function of the safety device can be ensured by limiting the number of operations of the emergency release switch.

  The present invention is not limited to the embodiment described above, and can be modified without departing from the spirit of the present invention.

  For example, in the above embodiment, all the energization of the forward solenoid valve 5, the reverse solenoid valve 6, and the cargo handling device solenoid valve 7 is restored, but only the forward and backward solenoid valves 5, 6 are energized. It can also be set as a structure, or it can also be set as the structure which returns electricity supply only of the solenoid valve 7 for cargo handling apparatuses. Further, an emergency release switch for returning the energization of the forward solenoid valve 5 and the reverse solenoid valve 6 and an emergency release switch for returning the energization of the cargo handling device solenoid valve 7 should be provided separately. You can also. In an industrial vehicle such as a towing vehicle that does not include a solenoid valve for a cargo handling device, the energization of only the forward / reverse solenoid valves 5 and 6 can be restored.

  Further, the emergency release switch 13 may employ either a so-called momentary type (automatic return type) or an alternate type (position holding type, push-on / push-off type). The automatic return type releases the safety device only while it is pressed and enables traveling and cargo handling operations, so it is easy to ensure the safety function of the safety device. As is the case with the automatic return type, even with the position holding type, a certain safety function can be ensured by limiting the number of operations that can be performed to release the safety device. The safety function of the safety device can be further ensured by continuing to operate and displaying a failure warning light.

  In the above-described embodiment, the detection switch built in the seat portion of the seat is exemplified as the seat seating detection switch for detecting the seating. However, the switch for detecting that the seat belt is mounted is exemplified. It is also possible to determine that the user is seated when both switches are ON.

2 Seat 3 Seat Seat Detection Switch 4 Control Device 5 Forward Solenoid Valve 6 Reverse Solenoid Valve 7 Solenoid Valve for Cargo Handling Device 1 First Shutdown Relay 9 Second Shutdown Relay 10 Alarm Buzzer 11 Non-sitting Warning Light 13 Emergency Release Switch 15 Fault warning light

Claims (6)

A seat seating detection switch for detecting whether or not the driver seat is seated;
A control device for controlling the energization state of the forward solenoid valve and the reverse solenoid valve;
An emergency release switch connected to the control device,
The control device shuts off the energization of the forward solenoid valve and the reverse solenoid valve when the non-seating is detected by the seat seating detection switch, and integrates the number of ON operations of the emergency release switch. It is determined whether or not the accumulated number of ON operations is within a predetermined number, and the forward release after determining that the emergency release switch is in an ON state and the number of ON operations is within the predetermined number. A safety device for an industrial vehicle, wherein energization of the solenoid valve and the reverse solenoid valve is restored. A seat seating detection switch for detecting whether or not the driver seat is seated;
A control device for controlling an energization state of a solenoid valve for a cargo handling device that controls supply of hydraulic oil to a hydraulic cylinder of the cargo handling device;
An emergency release switch connected to the control device,
The control device interrupts energization to the solenoid valve for cargo handling device when non-seating is detected by the seat seating detection switch, and accumulates and stores the number of ON operations of the emergency release switch, It is determined whether or not the accumulated number of ON operations is within a predetermined number, and after determining that the emergency release switch is in an ON state and the number of ON operations is within the predetermined number, the solenoid valve for the cargo handling device is A safety device for an industrial vehicle characterized in that energization is restored. A seat seating detection switch for detecting whether or not the driver seat is seated;
A forward solenoid valve, a reverse solenoid valve, and a control device for controlling the energization state of the solenoid valve for the cargo handling device that controls the supply of hydraulic oil to the hydraulic cylinder of the cargo handling device;
An emergency release switch connected to the control device,
The control device shuts off power to the forward solenoid valve, the reverse solenoid valve, and the cargo handling device solenoid valve when non-seating is detected by the seat seating detection switch, and the emergency device The number of ON operations of the release switch is accumulated and stored, and it is determined whether or not the accumulated number of ON operations is within a predetermined number. The emergency release switch is in an ON state and the number of ON operations is within the predetermined number. A safety device for an industrial vehicle, wherein energization to the forward solenoid valve, the reverse solenoid valve, and the cargo handling device solenoid valve is restored after it is determined that there is. The industrial vehicle safety device according to any one of claims 1 to 3, further comprising a reset switch that resets the stored number of times of integration of the number of ON operations of the emergency release switch. Said controller, when said emergency release switch has been turned ON, to any one of claims 1-4, characterized in that turning on the fault warning lamp to indicate that the sheet seating detection switch is faulty Industrial vehicle safety device as described. The control device further activates at least one of a non-seating warning light and an alarm buzzer when non-seating is detected by the seat seating detection switch, and the non-seating is performed even after the emergency release switch is turned on. The industrial vehicle safety device according to any one of claims 1 to 5 , wherein the operation of at least one of a warning light and a warning buzzer is maintained.

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