JPH04330123A - Safety device of construction machine - Google Patents

Abstract

PURPOSE:To issue an alarm from the land worker side to a machine operator for a construction machine and restrict its motions when any hazardous matter arises in case the operation takes place with the construction machine being in proximity to any of the land workers working around it. CONSTITUTION:A construction machine is equipped with an alarm device 6' which issues alarm and an alarming output in conformity to a signal received by a signal receiver furnished on the construction machine side, and the machine operator is given an alarm when any land worker 7 transmits a specified signal from a signal transmitter 8' on the land worker side. Thus the motion of the construction machine is restricted. The land worker side transmitter is equipped with a changeover switch 22 for selection of the type of the transmitted waves, and the land worker turns this switch to decide if the alarm for machine operator is {o be issued or not, and select the part of action and its degree of the construction machine for which the alarming output is emitted.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote-controlled safety device for upper swing type construction machines such as hydraulic excavators, working vehicles, and the like.

0002

2. Description of the Related Art FIG. 2 is a side view of a hydraulic excavator equipped with a prior art safety device. In the figure, 1 is a lower traveling body of a hydraulic excavator, 2 is an upper revolving body, 3 is a swing motor, 4 is an ultrasonic transceiver, and 5 is an alarm. FIG. 3 is a plan view of the main part of FIG. 2. In the figure, 6 is the upper rotating body 2
7 is a worker who works around the outside of the hydraulic excavator, and 8 is a receiver and transmitter provided for the worker 7. FIG. 4 is a circuit diagram of a main part of an embodiment of a safety device of the prior art. In the figure, 9 is a brake valve for the swing motor 3, 10 is a pilot switching valve for controlling the swing motor 3, and 1
1 is a main pump, 12 is an electromagnetic switching valve, 13 is a solenoid for the electromagnetic switching valve 12, 14 is a remote control valve for swinging, 15 is an operating lever for the remote control valve for swinging 14, 16 is a pilot pump, 17 is the main pump 11 and the pilot This is an engine that drives the pump 16.

A prior art safety device will be described with reference to FIGS. 2-4. When the worker 7 enters a specified range (not shown) around the hydraulic excavator, the transmitter 8 equipped on the worker 7
The ultrasonic waves emitted from the hydraulic excavator are received by a receiver/transmitter 4 placed in the hydraulic excavator. The received ultrasonic signal is then input to the alarm device 6 by the transmitter/receiver 4. The alarm device 6 outputs an alarm command signal to the alarm device 5 based on the ultrasonic signal. At the same time, the alarm device 6 outputs an alarm output to the solenoid 13 of the electromagnetic switching valve 12. As a result, the electromagnetic switching valve 12 switches and shuts off the pilot line of the pilot switching valve 10, so that the upper rotating body 2 stops rotating. In the above case, the hydraulic excavator generates an alarm sound to the workers 7 and others around the outside and stops rotating.

[0004] At sites where hydraulic excavators are operated, the hydraulic excavators and workers often perform work in close proximity. In hydraulic excavators equipped with conventional safety devices, if a worker enters the specified area around the outside and performs work, alarm 5 will be activated.
The hydraulic excavator becomes unable to work because the machine keeps making noise or automatically stops rotating. In the end, I ended up working on the hydraulic excavator without using the safety equipment, which was dangerous because the safety equipment could not function properly. Additionally, there are times when workers want the hydraulic excavator to generate alarms and warning outputs, or to take various different responses, depending on the dangerous situation. For example, there were times when I wanted to issue an alarm only to the operator, or when I wanted to issue an alarm to the operator and decelerate the rotation, or when I wanted to issue an alarm to the operator and stop the rotation, but this was not possible.

[0005]

[Problem to be solved by the invention] The problem to be solved is that when a dangerous situation occurs at a site where a hydraulic excavator and a worker are working in close proximity, the operator operating the hydraulic excavator However, it was not possible for the workers to issue a warning and at the same time restrict the operation of the hydraulic excavator. When there is a risk of danger occurring or when a danger has occurred, you want to respond according to the situation of the danger, for example, when you want to issue only an alarm to the operator, or when you want to issue an alarm to the operator and decelerate the rotation. There were times when I wanted to issue an alarm to the operator and stop the rotation, but I was unable to do so.

[0006]

[Means for Solving the Problems] The present invention provides a worker-side signal transmitter that allows the worker to select whether to start or stop transmitting a signal, and a construction machine that transmits a signal from the worker-side signal transmitter. a construction machine side signal receiver that receives the signal received by the construction machine;
An alarm device is installed that generates an alarm and an alarm output according to the signal received by the signal receiver on the construction machine side, and the worker operates the construction machine by transmitting a specific signal from the signal transmitter on the worker side. It is configured to give a warning to operators and restrict the operation of construction machinery. In addition, the worker side transmitter is equipped with a switch that allows you to select the type of radio waves to be transmitted.
By operating the changeover switch, a worker can select generation or non-occurrence of an alarm to the operator of the construction machine and the degree of action from the action part of the construction machine that causes the alarm output to be output.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a circuit diagram showing a safety device of the present invention. In the figure, the same reference numerals are given to the same components as in the prior art. 4' is a construction machine side signal receiver placed on the upper revolving body of the hydraulic excavator, 6' is an alarm device that controls the alarm and alarm output of the hydraulic excavator, 8' is a worker side signal transmitter, and 18 is a signal receiver for the engine 17. governor, 1
9 is a control motor that adjusts and drives the governor 18; 20 is an alarm that issues an alarm to the operator operating the hydraulic excavator (the alarm is not limited to an alarm sound, but may also be an alarm light emission, etc.); 2;
Reference numeral 1 denotes a regulator that adjusts the tilt angle of the swash plate of the main pump 11.

Next, the configuration of the safety device of the present invention will be described with reference to FIG. A worker-side signal transmitter 8' (hereinafter referred to as "worker-side transmitter 8'") that allows the worker 7 to select whether to start or stop signal transmission is disposed, and the hydraulic excavator is equipped with the worker-side signal transmitter 8'. Construction machine side signal receiver 4' (hereinafter referred to as construction machine side receiver 4') that receives signals transmitted from the construction machine side signal receiver 4'
and an alarm device 6' that generates an alarm and an alarm output according to the signal received by the construction machine side receiver 4', and the worker 7 transmits a specific signal from the worker side transmitter 8'. The present invention is configured to give a warning to an operator (not shown) operating the hydraulic excavator and restrict the operation of the hydraulic excavator. In addition, the worker side transmitter 8' is provided with a changeover switch 22 that can select the amplitude of the transmitted radio wave, and when the worker 7 operates the changeover switch 22, an alarm is generated or not generated for the operator of the hydraulic excavator. and the action parts of the hydraulic excavator that output the alarm output (referring to the control motor 19 that adjusts the governor 18 of the engine 17, the regulator 21 of the main pump 11, the solenoid 13 of the electromagnetic switching valve 12 in the swing operation circuit, etc.) can be selected. did.

Next, the operation of the safety device of the present invention will be described. When worker 7 is working near a hydraulic excavator and something dangerous happens, worker 7
transmits a specific signal from the worker side transmitter 8'. The transmitted specific signal is received by the construction machine side receiver 4' of the hydraulic excavator, and the received signal is input to the alarm device 6'. Based on the above received signal, the alarm device 6'
An alarm generation command signal is output to the alarm device 20 for the operator. At the same time, the control motor 1 is activated from the alarm device 6'.
9, an engine rotation reduction command signal is output. As a result, the alarm 20 issues an alarm to the operator operating the hydraulic excavator, and at the same time, the rotation speed of the upper rotating structure of the hydraulic excavator can be reduced. The operator can listen to the above warning, confirm safety, drive carefully, and operate slowly. In the above case, the warning device 6' outputs an engine rotation reduction command signal to the control motor 19.
A pump discharge flow rate reduction command signal may be output to the regulator 21 of the main pump 11.

[0010] Furthermore, when the worker 7 is working in the vicinity of the hydraulic excavator, when there is a risk of danger occurring or when a danger occurs, the worker's side is The changeover switch 22 of the transmitter 8' is operated to a required changeover position (not shown). Changeover switch 22
is operated to transmit a radio wave having an amplitude α, for example, from the worker side transmitter 8'. The radio wave having the amplitude α is received by the construction machine side receiver 4', and the received signal is input to the alarm device 6'. The alarm device 6' makes a judgment based on the received signal and outputs an alarm generation command signal only to the alarm device 20 for the operator. As a result, the alarm 20 issues an alarm to the operator operating the hydraulic excavator, but the operation of the hydraulic excavator is not restricted. The operator can listen to the above warning, confirm safety, and drive with caution. Further, the worker 7 operates the changeover switch 22 to transmit a radio wave having an amplitude β, for example, from the worker side transmitter 8'. In this case, the alarm output from the alarm device 6' is output only to the control motor 19. Although the rotational speed of the engine 17 is reduced, no alarm is issued to the operator. Since the swing speed and other operating speeds of the hydraulic excavator are reduced, the safety of the workers can be ensured. Further, when an emergency occurs, the worker 7 operates the changeover switch 22 to transmit a radio wave having an amplitude γ, for example, from the worker side transmitter 8'. In this case, the alarm output from the alarm device 6' is output to the alarm device 20 and the solenoid 13 of the electromagnetic switching valve 12. As a result, the alarm 20 issues an alarm to the operator operating the hydraulic excavator, and at the same time, the hydraulic excavator stops turning. As described above, by operating the changeover switch 22 of the worker side transmitter 8' depending on the danger situation, it is possible to select whether or not to issue a warning to the operator and which part of the hydraulic excavator outputs the warning output. can.

[0011]

[Effects of the Invention] As explained above, in the present invention, when a worker transmits a specific signal from the worker side signal transmitter, a warning is given to the operator operating the construction machine, and the operation of the construction machine is restricted. I decided to do so. In addition, the worker side transmitter is equipped with a switch that allows you to select the amplitude of the transmitted radio waves.
By operating the changeover switch, a worker can select whether or not to issue an alarm to the operator of the construction machine, as well as the operating part of the construction machine that outputs the alarm output and the degree of action. As a result, if a dangerous situation occurs when construction machinery and workers are working in close proximity, the worker will issue a warning to the operator operating the construction machinery, and at the same time the construction machinery will start operating. can be restricted. When there is a risk of danger occurring or when a danger has occurred, by operating the changeover switch on the worker side signal transmitter, it is possible to determine whether or not to issue an alarm to the operator, and to control the action part of the construction machine that outputs the alarm output. You can choose. In other words, various different responses are taken for the operator and the construction machine depending on the danger situation, thereby improving safety in close work between the worker and the construction machine.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a safety device of the present invention.

FIG. 2 is a side view of a hydraulic excavator equipped with a prior art safety device.

FIG. 3 is a plan view of the main part of FIG. 2;

FIG. 4 is a main circuit diagram showing an embodiment of a safety device of the prior art.

[Explanation of symbols]

3 Swivel motor 4’ Construction machine side signal receiver 5,20 Alarm 6,6’　Alarm device 7. Workers 8’　Worker side signal transmitter 11 Main pump 12 Solenoid switching valve 17 Engine 22 Selector switch

Claims (2)

[Claims] Claim 1: A remote control device that controls a part of the operation of a construction machine by operating a transmitter provided to a worker outside the construction machine, the remote control device being capable of instructing the worker to start transmitting a signal. A construction machine side signal receiver is provided with a worker side signal transmitter that can select whether to stop transmission, and the construction machine side signal receiver receives the signal transmitted from the worker side signal transmitter, and the construction machine side signal receiver is installed on the construction machine. An alarm device is installed that generates an alarm and an alarm output in response to the signal received by the worker, and the worker sends a specific signal from the worker's signal transmitter to alert the operator of the construction machine and A safety device for construction machinery, characterized in that it is configured to control the operation of the machine. [Claim 2] A remote control device that controls part of the operation of the construction machine by operating a transmitter provided to the worker outside the construction machine. A worker-side signal transmitter that can select whether to stop the transmission is installed, a changeover switch is installed on the worker-side signal transmitter to select the type of radio waves to be transmitted, and the worker-side signal transmitter transmits signals to the construction machine. A construction machine side signal receiver that receives the signal and an alarm device that generates an alarm and alarm output in accordance with the signal received by the construction machine side signal receiver are provided, and the worker operates the changeover switch. A safety device for a construction machine, characterized in that generation or non-occurrence of an alarm to an operator of the construction machine, and the action part of the construction machine and the degree of action for outputting the alarm output can be selected.