JP2006274750A - Safety device of construction machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safety device of construction machinery provided to avoid danger at the start time of an engine to ensure safety when the engine starts. <P>SOLUTION: This safety device of the construction machinery is provided with a relay 32 for informing and an informing device 34 for informing in accordance with output of a start signal 20 from a key switch 11 at an engine start position, a delay relay 36 for outputting a starter signal by being delayed for predetermined time for input of the start signal 20, and a controller 38 capable of controlling start of the engine. The controller 38 controls engine start in accordance with input of the starter signal 22. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a safety device for a construction machine, which is provided in order to avoid danger when starting an engine.

Conventionally, as disclosed in Patent Documents 1 and 2 below, a safety device for a construction machine that emits an alarm sound or the like when an engine of a construction machine such as an excavator or a crane is started is known. In the technique disclosed in Patent Document 1, when a key switch is turned on at the time of engine start, a sound for notifying engine start is generated. Moreover, in what was disclosed by patent document 2, when an engine drives, a switch will be turned on and a warning will be emitted.
JP 2002-327469 A JP 2000-240107 A

  However, what is disclosed in the above-mentioned patent document issues an alarm or the like at the time of starting the engine. However, in any case, there is not enough time from when the alarm is issued until the engine is actually started. There is a problem that it is not sufficient from the viewpoint of avoiding the problem. In other words, the engine may start until the surrounding worker recognizes the danger due to an alarm or the like and evacuates, which is not sufficient in terms of safety.

  Therefore, the present invention has been made in view of such a point, and an object thereof is to ensure safety at the time of engine start.

  In order to achieve the above object, the present invention provides an informing means for informing in response to an input of a start signal output when a start switch is operated to an engine start position, and a predetermined time with respect to the input of the start signal. The controller includes a delay unit that delays and outputs a starter signal, and a controller that can perform engine start control. The controller is a safety device for a construction machine that performs engine start control in response to input of the starter signal.

  In this configuration, the engine does not start until a predetermined time has elapsed since the notification was made, so that it is possible to secure time for a nearby worker to recognize the danger and evacuate before starting the engine. .

  The present invention also provides a notification means for performing notification in response to an input of a key-on signal output when the start switch is operated to a key-on position, and outputs a starter signal with a delay of a predetermined time with respect to the input of the key-on signal. A delay unit and a controller capable of engine start control, wherein the controller performs engine start control in response to an input of a start signal output when the start switch is operated to an engine start position and the starter signal. It is good also as a safety device of the construction machine to perform.

  Even in this configuration, since the engine does not start until a predetermined time has elapsed since the notification was made, it is possible to secure a time for a nearby worker to recognize the danger and evacuate before starting the engine. .

  In this configuration, the notification unit may be configured to perform notification for a predetermined time after a key-on signal is input, and the delay unit may be configured to output a starter signal for a predetermined time.

  In this configuration, the starter signal is input to the controller only for a predetermined time. For this reason, since the engine can be started only for a predetermined time after the start switch is set to the key-on position, when the start switch is set to the engine start position after a certain amount of time has passed in the key-on position, It is possible to avoid starting the engine after a long time has elapsed.

  Further, there is provided a cutting means for cutting a key-on signal output to the notifying means and the delay means when at least one of the boarding / alight-blocking lever, the turning operation lever, the traveling operation lever, and the attachment operation lever is in the operating position. Is preferred.

  In this configuration, when any lever is in the operating position, the key-on signal is cut, so that no notification is performed. At this time, since the starter signal is not output, the engine is not started. As a result, it is possible to prevent the engine from starting when any of the levers is in the operating position, and to avoid erroneous reporting when the engine is not started.

  The start switch may have a key-off position, a key-on position, and an engine start position, and may be configured to be a push-in type in which the rotation operation from the key-off position to the key-on position cannot be directly rotated to the engine start position. .

  In this configuration, it is possible to prevent a situation in which the operator unintentionally turns the engine to the engine start position and starts the engine against the operator's will after a predetermined time has elapsed.

  As described above, according to the present invention, the engine can be started with a delay after the notification is made, so that safety at the time of starting the engine can be ensured.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing a safety device 30 according to Embodiment 1 of the present invention including the main part of a construction machine. The safety device 30 is applied to a construction machine such as a crane or an excavator.

  The construction machine is provided with at least a key switch 11 as an example of a start switch and an engine 13 for driving a hydraulic device (not shown). As shown in FIG. 2, the key switch 11 has a key-off position, a key-on position, and an engine start position. When the key 15 is rotated to the key-on position, the power is turned on and a key-on signal is output. A start signal 20 is output when the engine is turned to the engine start position.

  As shown in FIG. 1, the safety device 30 includes a notification relay 32, a notification device 34, a delay relay 36 as an example of a delay unit, and a controller 38.

  The notification relay 32 is electrically connected to the key switch 11, and is configured to output a relay-on signal 21 when the start signal 20 is input from the key switch 11. For example, as shown in FIG. 3, when the start signal 20 is input at time T1, the notification relay 32 is configured to output the relay-on signal 21 for a predetermined time (time T1 to T2) from this time T1. Yes. The predetermined time may be a fixed time or a variable time that can be set as appropriate.

  The notification device 34 is configured to emit an alarm sound when the relay-on signal 21 is input from the notification relay 32. That is, in the first embodiment, the notification relay 32 and the notification device 34 constitute the notification means referred to in the present invention.

  The delay relay 36 is electrically connected to the key switch 11, and is configured to output a starter signal 22 after a predetermined time has elapsed from the start of input when the start signal 20 is input from the key switch 11. Yes. For example, as shown in FIG. 4, when the start signal 20 is input at time T1, the delay relay 36 is configured to output the starter signal 22 with a predetermined time (time T1 to T3) delayed from the time T1. Has been. The delay time (time T1 to T3) by the delay relay 36 is set to be longer than the notification time (time T1 to T2) for the notification relay 32 to output the relay-on signal 21.

  The controller 38 is electrically connected to the delay relay 36, and is configured to execute control for starting the engine 13 when the starter signal 22 is input from the delay relay 36.

  A control operation of the safety device 30 according to the first embodiment will be described. By rotating the key 15 of the key switch 11, a key-on signal is output when the key switch 11 changes from the key-off position to the key-on position. In this state, the safety device 30 does not particularly perform a control operation.

  When the key 15 is rotated to the engine start position, a start signal 20 is output from the key switch 11 (time T1). At the same time, the notification relay 32 outputs the relay-on signal 21, while the delay relay 36 does not output the starter signal 22 until the delay time (time T1 to T3) elapses even when the start signal 20 is input.

  And the alerting | reporting apparatus 34 emits an alarm sound during the predetermined time (time T1-T2) when the relay-on signal 21 is input. Thereafter, when the alarm sound ends, for example, at time T3, the delay relay 36 outputs the starter signal 22. As a result, the controller 38 executes engine start control, and the engine 13 is started.

  As described above, according to the present embodiment, the engine 13 does not start until a predetermined time has elapsed after the notification is made, so that nearby workers recognize the danger and evacuate before starting the engine. Time to do. Thereby, the safety | security at the time of engine starting can be ensured.

  In the first embodiment, the delay unit is configured by a relay, but is not limited thereto, and may be configured to be delayed by microcomputer control or the like, for example.

  Further, although the alarming sound is generated as the notification means, the present invention is not limited to this. For example, a warning light may be blinked or a sound may be played. In addition, the alarm device 34 emits an alarm sound for a predetermined time using a relay, but the present invention is not limited to this. For example, control for generating an alarm sound for a predetermined time by microcomputer control or the like may be performed. Good.

  Further, the key switch 11 may be configured as a so-called push-in type as shown in FIG. That is, the key switch 11 has a key-off position, a key-on position, and an engine start position. When the key 15 is rotated from the key-off position to the key-on position, the key switch 11 cannot be directly rotated to the engine start position. In order to perform the rotation operation to the start position, it is necessary to press the key 15 once at the key-on position. By making the key switch 11 into a push-in type, the operator unintentionally rotates the engine to the engine start position, and the engine 13 is started against the operator's will after a predetermined time has elapsed. Can be prevented.

(Embodiment 2)
FIG. 6 is a block diagram showing the safety device 30 according to the second embodiment of the present invention including the main part of the construction machine. Here, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  Although not shown, the construction machine to which the safety device 30 is applied is, for example, a lower traveling body made of, for example, a crawler, an upper revolving body supported on the lower traveling body so as to be rotatable about a vertical axis, And an attachment supported by the body.

  The safety device 30 according to the second embodiment includes a switching relay 40, a notification relay 32, a notification device 34, a delay relay 36, and a controller 38.

  The switch relay 40 is electrically connected to a switch 17a that is linked to the operation of the entry / exit blocking lever 17, a switch 18a that is linked to the operation of the turning operation lever 18, and a switch 19a that is linked to the operation of the travel control lever 19. ing.

  The entrance / exit blocking lever 17 is disposed in the vicinity of the cabin entrance / exit, which is not shown in the figure, and has an operating position that obstructs an operator's entry / exit and an off position that does not obstruct the entrance / exit. The switch 17a interlocked with the boarding / alighting cutoff lever 17 is configured to output a lever-on signal 24 when the boarding / alighting cutoff lever 17 is operated so as to be in the operating position. It is to be noted that, when the lifting / lowering blocking lever 17 is operated to be in the operating position, the attachment is not operated even if the unillustrated attachment operating lever is positioned in the operating position, as in the known art. It is.

  The turning operation lever 18 is disposed in a driver's seat (not shown), and has an operation position for turning the upper turning body and an off position for fixing the position without turning the upper turning body. Have. The switch 18a linked to the turning operation lever 18 is configured to output a lever-on signal 24 when the turning operation lever 18 is operated so as to be in the operating position.

  The traveling operation lever 19 is disposed in a driver seat (not shown), and has an operating position for traveling the lower traveling body and an off position for stopping the lower traveling body. The switch 19a linked to the traveling operation lever 19 is configured to output a lever-on signal 24 when the traveling operation lever 19 is operated so as to be in the operating position.

  The lever-on signal 24 output from these switches 17a, 18a, 19a is input to the switching relay 40.

  The switch relay 40 is electrically connected to the key switch 11. When the key-on signal 25 is input from the key switch 11, the switch relay 40 receives the lever-on signal 24 from each switch 17 a, 18 a, 19 a. The first ON signal 26 is output on the condition that is not input. In other words, the switching relay 40 is included in the concept of a cutting means that cuts the key-on signal 25 when at least one of the boarding / alighting cutoff lever 17, the turning operation lever 18, and the traveling operation lever 19 is in the operating position.

  The notification relay 32 is configured to output the second on signal 27 for a predetermined time when the first on signal 26 is input from the switching relay 40. The notification device 34 is configured to emit an alarm sound when the second ON signal 27 is input from the notification relay 32. For example, as shown in FIG. 7, when the first on signal 26 is input (time T4), the notification relay 32 outputs the second on signal 27 only for a predetermined time (time T4 to T5), during which an alarm sound is generated. Be emitted.

  The delay relay 36 is electrically connected to the notification relay 32, and when the second on signal 27 is input from the notification relay 32, the delay relay 36 holds the second on signal 27 and starts the input. The starter signal 22 is output after a predetermined time has elapsed. For example, as shown in FIG. 8, the starter signal 22 is output with a delay of a predetermined time (time T4 to T6) from the time T4 when the second ON signal 27 is input. The delay time (time T4 to T6) by the delay relay 36 is set to be longer than the notification time (time T4 to T5) for the notification relay 32 to output the second on signal 27.

  The controller 38 is electrically connected to the delay relay 36 and the key switch 11. The controller 38 receives the start signal 20 from the key switch 11 while the starter signal 22 is input from the delay relay 36. Then, the control for starting the engine 13 is executed.

  In the safety device 30 according to the second embodiment, when the key switch 11 is set to the key-on position, the key-on signal 25 is output. At this time, if the lever-on signal 24 is not input from any of the switches 17a, 18a, 19a, the switching relay 40 outputs the first ON signal 26. On the other hand, even when the key-on signal 25 is input, if any of the entry / exit blocking lever 17, the turning operation lever 18 and the traveling operation lever 19 is in the operating position and the lever-on signal 24 is input, the switching relay 40 does not output the first ON signal 26. At this time, since the starter signal 22 is not output from the delay relay 36, the engine 13 is not started even if the key switch 11 is operated to the start position.

  When the first ON signal 26 is input to the notification relay 32, the notification relay 32 outputs the second ON signal 27 for a predetermined time (time T4 to T5), during which the notification device 34 emits an alarm sound. At the same time, the second ON signal 27 is input to the delay relay 36. The delay relay 36 does not output the starter signal 22 until the delay time (time T4 to T6) elapses even when the second ON signal 27 is input. Thereafter, when the alarm sound ends, for example, at time T6, the delay relay 36 outputs the starter signal 22 for a predetermined time (time T6 to T7). The controller 38 executes engine start control when the key switch 11 is operated to the start position and the start signal 20 is input within the time when the starter signal 22 is input, and the engine 13 is started. . On the other hand, even if the key switch 11 is operated to the start position, the controller 38 does not execute the engine start control if it is after the output of the starter signal 22 is stopped. At this time, the engine 13 does not start.

  As described above, also in the second embodiment, it is possible to ensure time for the nearby workers to recognize the danger and to evacuate before starting the engine, so it is possible to ensure safety when starting the engine. .

  In the second embodiment, since the starter signal 22 is input to the controller 38 only for a predetermined time, the engine 13 can be started only for the predetermined time after the key-on position. For this reason, even if the key switch 11 is set to the engine start position after a certain amount of time has passed in the key-on position, the engine 13 cannot be started. As a result, the engine 13 is started after a long time has elapsed after notification. Can be avoided.

  In the second embodiment, the key-on signal 25 is cut when any of the levers 17, 18, 19 is in the operating position, so that no notification is given and the starter signal 22 is not output. It will not be started. As a result, it is possible to prohibit the engine 13 from starting when any of the levers 17, 18, 19 is in the operating position, and to avoid misreporting when the engine 13 is not started. it can.

  In the second embodiment, the output of the starter signal 22 from the delay relay 36 is delayed by using the second ON signal 27 output from the notification relay 32 as a trigger. The switching relay 40 may be electrically connected, and the first ON signal 26 output from the switching relay 40 may be used as a trigger.

  Further, the start signal 20 is input to the switching relay 40, and the switching relay 40 outputs the first ON signal 26 on condition that the lever ON signal 24 is not input from any of the switches 17a, 18a, 19a. It is good also as composition to do. In this case, the controller 38 is configured to execute engine start control when the starter signal 22 is input from the delay relay 36.

  Further, in the second embodiment, the configuration in which the boarding / alighting cutoff lever 17 is provided has been described. In this case, a switch (not shown) interlocked with the operation of the attachment operation lever for operating the attachment is electrically connected to the switching relay 40. And this switch should just be comprised so that a lever-on signal may be output when an attachment operation lever is operated to the operation position for operating an attachment.

  Other configurations, operations, and effects are the same as those of the first embodiment although the description thereof is omitted.

It is a block diagram of the principal part of the construction machine to which the safety device concerning Embodiment 1 of the present invention was applied. It is a figure which shows the structure of a key switch schematically. It is a characteristic view which shows an example of the on-off state of the starting signal and relay on signal in Embodiment 1 of this invention. It is a characteristic view which shows an example of the on-off state of the start signal and starter signal in Embodiment 1 of this invention. It is a figure which shows schematically the structure of the key switch in other embodiment of this invention. FIG. 3 is a view corresponding to FIG. 1 in Embodiment 2 of the present invention. It is a characteristic view which shows an example of the on-off state of the 1st on signal and the 2nd on signal in Embodiment 2 of this invention. It is a characteristic view which shows an example of the on-off state of the 2nd ON signal and starter signal in Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Key switch 17 Boarding / alighting cut-off lever 18 Turning operation lever 19 Traveling operation lever 20 Start signal 22 Starter signal 25 Key-on signal 32 Notification relay 34 Notification device 36 Delay relay 38 Controller

Claims (5)

An informing means for informing in response to an input of a start signal output when the start switch is operated to the engine start position;
Delay means for delaying the start signal by a predetermined time and outputting a starter signal;
A controller capable of engine start control,
The controller is a safety device for a construction machine that performs engine start control in response to an input of a starter signal. An informing means for informing in response to an input of a key-on signal output when the start switch is operated to a key-on position;
Delay means for delaying the key-on signal by a predetermined time and outputting a starter signal;
A controller capable of engine start control,
The controller is a safety device for a construction machine that performs engine start control in response to an input of a start signal output when a start switch is operated to an engine start position and the starter signal. The notification means is configured to perform notification for a predetermined time after a key-on signal is input,
The safety device for a construction machine according to claim 2, wherein the delay means is configured to output a starter signal for a predetermined time.   A cutting means is provided for cutting a key-on signal output to the notifying means and the delay means when at least one of a boarding / alighting interruption lever, a turning operation lever, a traveling operation lever, and an attachment operation lever is in an operating position. The safety device for a construction machine according to 2 or 3.   The start switch has a key-off position, a key-on position, and an engine start position, and is configured to be a push-in type in which the rotation operation from the key-off position to the key-on position cannot be directly rotated to the engine start position. 5. The safety device for a construction machine according to any one of 4 above.

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