JP2000185894A - Safety device for working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent sound alarm from being outputted exceeding necessary frequency, by causing a sound alarm means to output a first sound alarm when a working machine operation detecting means detects a driving operation of the working machine or a stop operation after the driving operation before it detects a ground state of an outrigger device. SOLUTION: When outrigger devices 10, 10 are in a non-setting state (in a state that outrigger ground detecting means 15, 15 do not detect setting state of the outrigger devices 10, 10), a crane portion driving apparatus other than the outrigger devices 10, 10 is driven and operated. A control means outputs a command signal to a sound alarm means to output a first sound alarm, the sound alarm means generates the sound alarm that the outrigger devices 10, 10 are not installed, and a worker can easily recognize an operation error and can speedily perform an avoiding operation. When the crane portion driving apparatus is not driven or operated even if the outrigger devices 10, 10 are not installed, the control means does not output the command signal to the sound alarm means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for a working machine provided with an outrigger device such as a vehicle-mounted crane or a high-altitude working machine.

[0002]

2. Description of the Related Art An operator mounts on an in-vehicle type crane configured to carry a load by hanging a load on a hook suspended from a distal end of a telescopic boom or a bucket mounted on a distal end of the telescopic boom. Some boom type working machines such as aerial work machines configured to perform aerial work are equipped with an outrigger device for stably supporting a vehicle body during work.

In a working machine equipped with an outrigger device as described above, the outrigger device is installed before the work to stably support the vehicle body in order to perform the work safely. If the installation operation of the outrigger device is forgotten, or if the installation device sinks during the operation and the jack device rises, the stability of the vehicle body is impaired, which is dangerous. For this reason, the conventional work machine has been provided with a safety device for notifying a worker of the occurrence of this kind of abnormal situation.

[0004] As a safety device used in this type of working machine, for example, as disclosed in Japanese Utility Model Laid-Open Publication No. 59-32548, each outrigger device attached to the working machine is grounded. Attach a detector that detects whether the state is in the state or not, and when at least one detector detects a non-ground state of the outrigger device for a fixed time or more, a warning is sounded by a buzzer or the like, and the outrigger device is set prior to the work. The alarm of the non-installation state during the installation work,
It was common to provide a warning of a floating state in which the jack device floated due to the settlement of the installation ground or the like during work.

[0005]

However, in the conventional safety device, an alarm is issued until the jack device is grounded during the outrigger installation work. The installation work of the outrigger device is originally performed after the worker recognizes that the outrigger device is not installed.There is no need to issue an alarm unless the work machine is driven by erroneous operation, etc. There was a problem of applying. In addition, since the conventional safety device was configured to notify the outrigger non-installation state and jack floating state with a single alarm sound, the operator could not easily understand what caused the alarm, There was a problem that it took time to do.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, the present invention provides a safety device for a working machine which does not generate an alarm more than necessary at the time of outrigger installation work and which allows an operator to easily grasp the cause of the alarm. It is intended to provide.

[0007]

The present invention has the following structure as means for solving the above-mentioned problems.

The present invention is directed to a safety device for a working machine having a plurality of outrigger devices for supporting the working machine.

The safety device according to the present invention comprises: an outrigger ground detecting means for detecting whether the outrigger device is in a ground state; a work implement operation detecting means for detecting a driving operation state of a work machine other than the outrigger device; Voice warning means for outputting different types of voice warnings and control means, wherein the control means detects the work implement operation detection means of the work machine before all outrigger ground detection means detects the ground state of the outrigger device. When a driving operation or a stop operation after the driving operation is detected, a command signal for outputting a first sound alarm to the sound alarm means is output.

[0010] With this configuration, during the outrigger installation work until all outrigger devices are grounded and the work machine is stably supported, the control means determines that there is an outrigger device in an uninstalled state. Also, unless a work machine other than the outrigger device is driven and operated, no command signal is output to the voice alarm means, so that an unnecessary alarm is prevented and the trouble to surroundings is reduced. On the other hand, if a work machine other than the outrigger devices, for example, a driving cylinder is driven while all the outrigger devices are not grounded, the control means promptly outputs the first sound alarm to the sound alarm means. The command signal is output, and the voice alarm means receiving the command signal outputs the first voice alarm, that is, the voice alarm indicating that the outrigger device is not installed. Thus, the worker can easily recognize that the worker has driven and operated a work machine other than the outrigger device even though he or she has forgotten to install the outrigger device or the installation is insufficient.

Further, the safety device according to the present invention is characterized in that, after all outrigger ground detection means have once detected the grounding state of the outrigger device, at least one outrigger ground detection means has detected the non-ground state of the outrigger device. It is configured to output a signal for outputting a second voice warning to the voice warning means.

With this configuration, the control means determines that the work machine is in the working state once all the outrigger devices are in contact with the ground, and thereafter at least one outrigger device is in the floating state. When this happens, a command signal for outputting a second voice alarm to the voice alarm means is output, and upon receiving the command signal, the voice alarm means issues a second voice alarm, that is, a voice alarm indicating that the jack device is in a floating state. Is output. Thus, the operator can easily recognize that the jack device has been in a state of danger of lifting.

As described above, the safety device according to the present invention determines that the outrigger installation operation is being performed until all outrigger devices are grounded, and the outrigger device is not operated only when driving a work machine other than the outrigger device. An audio alarm is issued to indicate that the equipment is in the installed state. After all outriggers have been grounded, it is determined that the equipment is in the working state, and when at least one outrigger is in the floating state, the jack is in the floating state. The operator is notified by voice, and the operator can easily understand the cause of the abnormality by listening to the voice alarm, and can quickly perform the avoidance operation.

Further, the safety device of the present invention warns the outrigger device not installed state until all outrigger devices are grounded, and warns the floating state of the outrigger device once all outrigger devices are grounded. With such a configuration, the switching of the voice alarm content by the voice alarm means can be performed by a signal from the conventionally provided outrigger grounding detection means for outrigger floating warning, and a detection for separately detecting the work state of the work machine. This eliminates the need for any means, and can be implemented at low cost.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to FIGS. First, a working machine equipped with a safety device according to the present invention will be described with reference to FIG. The on-vehicle crane 1 is mounted on a vehicle frame 2 a behind the cab 3 of the traveling vehicle 2, and is pivotally mounted on a base 4, and is mounted on the upper portion of the rotation post 5 so as to be able to undulate. The telescopic boom 6, the hook 9 suspended from the distal end of the telescopic boom 6 by a wire rope 8 wound and driven by a winch 7, and the left and right positions of the base 4 are jacked up during crane work. It is composed of a pair of outrigger devices 10 supporting a crane unit.

On-board crane 1 constructed as described above
Before starting crane work, first outrigger device
Jack up 10 and 10 to support vehicle 2. Thereafter, the luggage is hung on the hook 9 suspended from the distal end of the telescopic boom 6, the turning post 5 is driven to turn, the telescopic boom 6 is raised and lowered, and the telescopic drive is driven. The crane work is performed by raising and lowering the.

As shown in FIG. 3, a pair of outrigger devices 10 and 10 mounted on the base 4 at the left and right positions are provided with an outer cylinder 11 mounted on the base 4 in the vehicle width direction, and at both ends of the outer cylinder 11. It consists of left and right inner cylinders 13 and 13 slidably inserted and equipped with jack devices 12 and 12 at the tip. First, the left and right inner cylinders 13 and 13 are manually extended to the outer cylinder 11. Later, the left and right jack devices 12, 12 are extended to ground the leg plates 14, 14, thereby stably supporting the crane unit.

Outrigger ground detection means 15, 15 are attached to upper ends 11a, 11a of both ends of the outer cylinder 11. The outrigger ground detection means 15, 15 are attached to upper ends 11a, 11a at both ends of the outer cylinder 11, and detect a vertical displacement of the left and right inner cylinders 13, 13 with respect to the outer cylinder 11.
When the jack devices 12, 12 are not in contact with the ground, the left and right inner cylinders 13, 13 are displaced downward by their own weights (illustrated by solid lines in FIG. 3), and the detection switch 15
When the jack devices 12 and 12 are grounded, the left and right inner cylinders 13 and 13 are displaced upward (shown by a chain line in FIG. 3) and the detection switches 15a and 15a are turned on. I have. As described above, the outrigger ground detection means 15 in this embodiment detects the backlash displacement in which the left and right inner cylinders 13 are displaced upward in the outer cylinder 11 when the jack devices 12 are grounded. , 15a, the grounding state of the outrigger devices 10, 10 can be grasped by the detection signals of the detection switches 15a, 15a. The outrigger ground detection means 15, 15
In another embodiment, some play is provided at the pivotal connection of the jack cylinders 25, 25 for driving the jack devices 12, 12, and when the jack devices 12, 12 are grounded, the jack cylinders 25, 25 are grounded.
The switch 25 may be configured to detect, by a switch or the like, a backlash displaced upward by an amount corresponding to the backlash. Further, in another embodiment, a pressure-sensitive switch is attached to a mounting portion of the jack devices 12, 12 with respect to the tip portions of the inner cylinders 13, 13, and a load acting on the jack devices 12, 12 when the jack devices 12, 12 are grounded. May be detected by the pressure-sensitive switch.

FIG. 4 is a block diagram of the safety device according to the present embodiment. The safety device according to the present embodiment includes a detection switch which constitutes the outrigger ground detection means 15, 15.
15a, 15a, a work implement operation detecting means 16 for detecting a driving operation state of a crane unit other than the outrigger devices 10, 10; a voice alarm means 17 for outputting different types of voice alarms; It is composed of

The work machine operation detecting means 16 includes a control valve for driving and controlling the crane unit, that is, a telescopic control valve 19a for a telescopic cylinder 19 for driving the telescopic boom 6 to expand and contract, and a winch 7
Control valve 20a for the winch motor 20 that drives the hoisting and lowering, and the hoisting cylinder that drives the telescopic boom 6 up and down
An up-and-down control valve 21a for the swing motor 21 and a swing control valve 22a for a swing motor 22 for swinging the swing post 5 are provided by a portable transmitter.
When the controller 16 receives a remote control signal from the transmitter 23 and outputs a valve switching signal to each of the control valves 19a to 22a, the controller 16 also serves as a remote control signal from the remote control signal from the controller 23. , An operation detection signal is output from the output terminal 16a to the CPU 18. As described above, the work implement operation detection means 16 in the present embodiment is configured such that when the controller 16 outputs a valve switching signal to each of the control valves 19a to 22a, an operation detection signal is output from the output terminal 16a. Therefore, it can be understood from the operation detection signal that the crane units other than the outrigger devices 10 and 10 have been driven. In another embodiment, the work implement operation detection means 16 may be configured to output an operation detection signal from the output terminal 16a when receiving a remote operation signal from the transmitter 23. In another embodiment, at the time of a stop operation after a valve switching signal is output from the controller 16 to each of the control valves 19a to 22a (at the time of a valve neutral return operation).
Alternatively, an operation detection signal may be output from the output terminal 16a. Further, in another embodiment, for example, when each of the control valves 19a to 22a is constituted by a manually operated valve, the switching operation of each of the control valves 19a to 22a is performed by a switch, a proximity switch, or a differential switch as shown in FIG. A configuration may be adopted in which the signal is directly detected by a moving transformer or the like and input to the CPU 18.

The CPU 24 detects that the jack devices 12, 12 are retracted, that is, that the jack control valve 25a for the jack cylinders 25, 25 for driving the jack devices 12, 12 has been moved to the retracted operation position. , And is provided for the purpose of preventing unnecessary alarms while the outrigger devices 10 and 10 are being stored.

The voice alarm means 17 is configured to output different types of voice alarms in response to a voice alarm command signal from the CPU 18. That is, the first from the CPU 18
When the command signal is input, the operator is notified that the outrigger device is not grounded, for example, the voice signal of "outrigger is not installed. Please install outrigger." Output to the speaker, and CPU
When the second command signal is input from 18, the operator is notified that the outrigger device has floated due to the subsidence of the installation ground or the like, for example, a voice of "Jack has floated". The signal is synthesized and output to a speaker.

The CPU 18 constituting the control means is provided with the outrigger device 10 from the detection switches 15a, 15a.
Upon receiving a detection signal relating to the installation state of 10, an operation detection signal relating to the operation state of each of the crane unit control valves 19 a to 22 a from the controller 16, and a jack storage operation signal from the jack storage detection switch 24, the built-in R
It is configured to perform arithmetic processing according to a control program stored in the OM, and to output a voice warning command signal to the voice warning means 17.

The control of the CPU 18 in this embodiment is as follows.
The control is performed based on the flowchart shown in FIG. When the control starts, first, in step S1, it is determined whether or not the left and right detection switches 15a, 15a constituting the outrigger ground detection means 15, 15 are in "contact". If “OFF” or one of them is “OFF” (judgment result is NO)
In step S2, it is determined that the outrigger devices 10 and 10 have not been installed yet, and the process proceeds to step S2, where the detection signal of the work equipment operation detection means 16, that is, the operation detection signal from the controller 16 It is determined whether or not "medium". If it is "operating" in step S2 (determination result is YES), it is determined that the crane unit is in an erroneous operation state in which the driving operation is performed even though the outrigger devices 10 and 10 are not installed. A command for instructing the audio alarm means 17 to issue a first audio alarm (an audio alarm indicating that the outrigger devices 10 and 10 are not installed, for example, "outrigger is not installed. Please install an outrigger."). A signal is output (step S3) and the process returns to step 1. If "non-operating" in step 2 (determination result is NO), it is determined that there is no need to issue an audio alarm while the outrigger is installed. Returning to step S1, the installation work is continued.

On the other hand, in step S1, the left and right detection switches
If both of 15a, 15a are "contact" (the determination result is YES), it is determined that the installation work of the outrigger devices 10, 10 is completed, and the process proceeds to step S4, where the detection switch is again turned on.
It is determined whether or not 15a and 15a are "contact". If both of the detection switches 15a, 15a are "connected" in step S4 (the determination result is YES), the outrigger device 10,
It is determined that 10 is not lifted and is in a safe working state, and the process returns to step S4 to continue the working. On the other hand, if any one of the detection switches 15a is "OFF" in step S4 (the determination result is NO), it is determined that at least one outrigger device 10 is in a dangerous state in which it is floating. Then, the process proceeds to step 5, where it is determined whether or not the jack storage detection switch 24 is "closed", that is, whether the jack storage operation is being performed. If it is determined in step 5 that the jack storage operation is not being performed (the determination result is NO), it is determined that the outrigger device 10 is in a dangerous work state in which the outrigger device 10 is floating, and the second sound alarm is issued to the sound alarm means 17. (Step S6) Outputs a command signal for instructing a voice alarm indicating that the outrigger devices 10, 10 are in a floating state, for example, "the outrigger has floated."
And return to step 4 to continue the work. Meanwhile, step
If it is determined in step 5 that the jack storage operation is being performed (the determination result is YES), it is determined that the work is completed, the jack devices 12 and 12 are being stored, and all control of the safety device is terminated. Has become.

In another embodiment, a jack device is further provided.
A jack full storage detecting switch for detecting that the jacks 12 and 12 have been completely stored is added, and after the YES determination in step 5 above, that is, the jack storing and storing operation is being performed, the jack full storing detecting switch is turned on. The detection result is judged, and if the judgment result is NO (the state where the jack devices 12 and 12 are not completely stored), the process returns to step 4 and the judgment result is YES (the state where the jack devices 12 and 12 are completely stored). The control of the safety device may be ended at the time of ()). In the case of such a configuration, even when the work is restarted after the jack devices 12, 12 are stored once,
The safety device is activated and safe work is possible.

According to the safety device configured as described above,
In a state where the outrigger devices 10 and 10 are not installed (the outrigger installation detecting means 15 and 15 do not detect the grounding state of all the outrigger devices 10 and 10), crane unit driving devices other than the outrigger devices 10 and 10 (for example, When the telescopic cylinder 19 and the up-and-down cylinder 21 are driven, the control means 18 outputs a command signal for outputting the first voice warning to the voice warning means 17, and the voice warning means 17 receiving the command signal outputs the command signal. An audible alarm indicating that the outrigger devices 10 and 10 are not installed, for example, "The outrigger device is not installed." Is issued, so that the operator can easily grasp that the erroneous operation has been performed, and promptly perform the avoidance operation. Can be done. On the other hand, when the outrigger devices 10 and 10 are not installed and the crane unit driving device is not driven, no command signal is output from the control unit 18 to the voice alarm unit 17,
There will be no audible warnings more than necessary and no annoying surroundings.

Further, once the outrigger devices 10 are installed (if the outrigger installation detecting means 15 detects the grounding state of all the outrigger devices 10, at least one).
When the outriggers 10 are lifted (when one outrigger installation detecting means 15 detects the non-ground state of the outriggers 10), the control means 18 issues a second signal to the sound alarm means 17.
A command signal for outputting a voice alarm is output, and the voice alarm means 17 receiving the command signal issues a voice alarm indicating that the outrigger devices 10 and 10 have risen, for example, "The outrigger device has floated." Since the warning is issued, the worker can easily understand that the dangerous state has been attained, and can quickly perform the avoidance operation.

[0029]

The safety device for a work machine according to the present invention has an outrigger device when the outrigger devices 10 are not installed.
Since the first audio alarm is output only when a work machine other than 10, 10 is driven, no audio alarm is output more than necessary, and no trouble is caused to the surroundings. It is. Also, once the outrigger device 10,
At least one outrigger device if 10 is grounded
Since the second voice alarm is output when 10 is in a floating state, the operator can easily grasp the cause of the alarm and can quickly perform the avoidance operation.

[Brief description of the drawings]

FIG. 1 is a control means in a safety device for a work machine according to the present invention.
18 is a control flowchart of Step 18.

FIG. 2 is a side view of a vehicle-mounted crane equipped with the safety device of the present invention.

FIG. 3 is an explanatory diagram of outrigger ground detection means 15 in the safety device of the present invention.

FIG. 4 is a block diagram of a safety device for a work machine according to the present invention.

FIG. 5 is a work machine operation detecting means in the safety device of the present invention.
It is explanatory drawing of 16 other embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Onboard crane 2 Vehicle 2a Vehicle frame 3 Operator's cab 4 Base 5 Swivel post 6 Telescopic boom 6 Undulating cylinder 7 Winch 8 Wire rope 9 Hook 10 Outrigger device 11 Outer cylinder 12 Jack device 13 Inner cylinder 15 Outrigger Installation detection means, 15a detection switch 16 Work equipment operation detection means (controller) 17 Voice alarm means 18 Control means (CPU) 19 Telescopic cylinder, 19a Telescopic control valve 20 winch motor, 20a winch control valve 21 Undulating cylinder, 21a Undulating control valve 22 Swivel motor, 22a Swivel control valve 23 Transmitter 24 Jack storage detection switch 25 Jack cylinder, 25a Jack control valve

Claims (1)

[Claims] 1. A safety device for a work machine having a plurality of outrigger devices for supporting the work machine, comprising: an outrigger ground detection means for detecting whether the outrigger device is in a ground state; and a work machine other than the outrigger device. Work equipment operation detection means for detecting the drive operation state of the vehicle, voice alarm means for outputting different types of voice alarms, and control means, wherein all the outrigger ground detection means detect the ground state of the outrigger device. Before the work machine operation detecting means detects a driving operation of the working machine or a stop operation after the driving operation, the work machine operation detecting means outputs a command signal for outputting a first sound alarm to the sound alarm means, and temporarily outputs all outrigger grounds. At least one outrigger ground detection unit detects the non-ground state of the outrigger device after the detection unit detects the ground state of the outrigger device. It was configured to output a command signal for outputting an alarm second voice to the voice alarm means upon detection safety device for a working machine according to claim.