JP3069453B2 - Alarm for construction work machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a construction work machine having a plurality of actuators, and issues an operation warning when the actuator is operated to prevent a personal injury due to the work machine. About
In particular, it is useful for a construction work machine that performs various operations such as a hydraulic shovel.

[0002]

2. Description of the Related Art A boom driven by an actuator such as a hydraulic cylinder is provided on a swivel on a self-propelled vehicle.
In a construction work machine such as a hydraulic shovel in which a front member such as an arm is rotatably mounted via a swivel base, when a self-propelled vehicle is driven or the swivel base is swung, the work is performed. An alarm device that issues an alarm with an alarm device has been provided to prevent personal injury or the like from occurring due to the machine.

[0003] An example of such a conventional alarm device for construction work machines will be described with reference to FIG. FIG. 2 is a hydraulic circuit diagram of a conventional alarm device for a construction machine.

First, a hydraulic circuit for driving an actuator will be described. In FIG. 1, reference numeral 1 denotes a prime mover, 2 denotes a hydraulic pump driven by the prime mover to generate hydraulic pressure for driving the actuator, and 2A denotes a prime mover similarly. A pilot pump as a pilot pressure source to be driven, 3 is a first control valve, 4 is a first actuator whose movement is controlled by a first control valve 3, 5 is a second control valve, and 6 is a second control valve. A second actuator whose movement is controlled by the second control valve 5. Among these actuators 4 and 6, the first actuator 4 issues an alarm at the time of operation such as a traveling hydraulic motor for driving a self-propelled vehicle of a hydraulic shovel or a turning hydraulic motor for driving the swivel. An activator who planned to do that. 7 is a first pilot valve for outputting a pilot pressure to the first control valve 3,
7a is the operating lever operated by the operator, 8
Is a second pilot valve for outputting a pilot pressure to the second control valve 5, and 8a is an operation lever similar to 7a. The pressure oil from the pilot pump 2A, which is guided to each of the pilot valves 7 and 8 through an oil passage,
The pressure can be adjusted according to the manipulated variables a and 8a, and a pilot pressure of a desired value can be output. a and b are a pair of left and right pilot pipelines for guiding the pilot pressure to the first control valve 3, and c and d are a pair of left and right pilot pipelines for guiding the pilot pressure to the second control valve 5, and each operating lever 7a, Depending on the operation direction 8a, the pilot pressure is guided to the left ends of the control valves 3 and 5 through the pilot lines a and c, or to the right ends of the control valves 3 and 5 through the pilot lines b and d. Or Each of the control valves 3 and 5 moves its spool to the left and right by the pilot pressure guided by the pair of pilot pipes a, b, c and d, and moves the spool to move the hydraulic pressure of the hydraulic pump 2 to each actuator. The ports for supplying to 4, 6 are opened. Different ports are opened according to the moving direction of the spool, so that the actuators 4 and 6 can be driven in either forward or reverse directions. Further, the amount of movement of the spool is determined in accordance with the value of the pilot pressure, and the opening amount of the port is adjusted according to the amount of movement of the spool, so that the flow rate of the pressure oil supplied to each of the actuators 4, 6, that is, the The speed can be adjusted.

Reference numeral 9 denotes a relief valve for limiting the maximum pressure of the hydraulic circuit, and reference numeral 10 denotes a lock which can close an oil passage for guiding the pressure oil of the pilot pump 2A to each of the pilot valves 7, 8 as required. It is a valve.

Next, the structure of the alarm device will be described. Referring to FIG. 2, reference numeral 11 denotes a pressure switch which detects the pilot pressure output from the first pilot valve 7 and closes the pilot switch, and 12 denotes pilot lines a and b. Each of the branch passages is connected to the in side and a signal path to the pressure switch 11 is connected to the out side. Reference numeral 13 denotes an alarm device such as a warning buzzer or a patrol light. When the operator operates the operating lever 7a in either direction to drive the first actuator 4, a pilot pressure is output from the pilot valve 7, and when the pilot pressure is guided to one of the pilot lines a and b, the pressure switch is switched. 11 is activated by the pilot pressure guided via the shuttle valve 12 and activates the alarm 13. Therefore, the pressure switch 11 has a function as a detecting means for detecting that the first actuator 4 is in the operating state and operating the alarm 13.

As is clear from the above description, in the conventional alarm device, the alarm device operates in conjunction with the driving operation of the self-propelled vehicle, or operates in conjunction with the turning operation of the turntable. One alarm is activated only under one kind of preset condition.

[0008]

However, in recent years, the construction work machines have been increasingly advanced, and the types of work performed by the construction work machines and the conditions of work sites have been diversified.
Along with this, it has been found that various needs have arisen for the alarm device on the site side. For example, recently, a radio-controlled construction work machine has been developed, but in the case of radio-controlled construction equipment, it is necessary to increase the number of actuators that should issue an alarm when activated in response to the risk of erroneous operation or malfunction. However, when the operation is switched to manual operation, the maintenance of safety for the surrounding workers is complemented by the operator, so that the number of types may be reduced. The conditions for issuing an alarm include work performed by a pair of people and work performed by a large number of workers, work involving high-speed traveling or high-speed large turning, and work involving only low-speed small turning at low-speed running.
It is necessary to change depending on the type and contents of the work such as whether or not the work involves the backward running. Furthermore, if the work site is a quiet residential area, it is necessary to determine the conditions for issuing an alarm in consideration of the situation of the work site, such as minimizing the chance of issuing an alarm. Looking at a specific example, when performing normal work, it is generally sufficient to issue an alarm only when traveling backwards, but for example, on narrow roads such as digging work for burying electric wires on the sidewalk. When working, it is necessary to issue a warning at the time of turning, rather than at the time of traveling, in order to ensure the safety of pedestrians.When excavating at the same time with multiple work machines, noise may be high. Yes, it is necessary to issue warnings both when traveling and turning to ensure the safety of multiple workers.When excavating and loading earth and sand on a dump truck, load it on the driver of the dump truck. It is necessary to change the condition for activating the alarm in accordance with the type of work and the situation at the work site, for example, it is necessary to issue an alarm even when the arm is operated in order to notify that the work is being performed.

[0009] However, the conventional alarm device which can operate only one alarm device under uniform conditions cannot meet such various field needs. The present invention solves such a problem of the conventional alarm device, and can operate one alarm device under various conditions according to the type of work, the situation of the work site, and the like, and can immediately respond to the needs of the site. It is an object of the present invention to provide an alarm device for a construction machine that can be used.

[0010]

SUMMARY OF THE INVENTION The above object of the present invention is as follows.
A warning device for a construction work machine used for a construction work machine having a plurality of actuators and for issuing an alarm for operation of the actuator, wherein a plurality of detection means for detecting that the actuator is in an operation state and activating an alarm device Operating means for selecting a detecting means to activate the alarm device from the plurality of detecting means, and operating the operating means to selectively activate the same alarm device with a desired detecting means. To be able to work
Activate the alarm according to the type of work and the situation at the work site
This can be achieved by an alarm device for a construction work machine in which conditions can be changed .

[0011]

According to the present invention, there is provided an alarm device for a construction work machine used for a construction work machine having a plurality of actuators for issuing a warning of the operation of the actuator. Since a plurality of detecting means for operating and an operating means for selecting a detecting means to activate the alarm from among the plurality of detecting means are provided, the operating means is operated, and a plurality of detecting means are provided. By selecting the detection means that should activate the alarm , the same alarm can be
Various conditions that meet the needs of the workplace depending on the conditions of the workplace
Can be operated in any case.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG.
FIG. 1 is a hydraulic circuit diagram of an alarm device for a construction work machine according to an embodiment of the present invention. In FIG. 1, portions denoted by the same reference numerals as those in FIG. 2 represent the same portions as those in FIG.

In FIG. 1, reference numeral 11A denotes a pressure switch which detects and closes the pilot pressure output from the second pilot valve 8, and 12A denotes a branch line from the pilot lines c and d connected to the in side. Pressure switch 1 on the out side
This is a shuttle valve connecting the signal path to 1A. In the present embodiment, the same components as the pressure switch 11 and the shuttle valve 12 described in the section of "Prior Art" are provided corresponding to the first pilot valve 7, and as described above, Pressure switch and shuttle valve are provided corresponding to the second pilot valve 8. Reference numeral 14 denotes a switching switch, which includes a fixed contact w connected to the electric circuit from the pressure switch 11A, a fixed contact y connected to the electric circuit from the pressure switch 11, and an input connected to the output of an OR circuit connected to these electric circuits. And a movable contact v connected to an electric circuit from the alarm device 13 and having a fixed contact x and an idle contact z. Therefore, in this embodiment, neither of the pressure switches 11 and 11A is directly connected to the alarm 13 like the pressure switch 11 described in the section of "Prior Art".

Since the alarm device for a construction machine according to the present embodiment has the above-described structure, the switching switch 14 is provided.
When the movable contact v of the above is placed in contact with the fixed contact w,
The electric circuit of the alarm 13 is connected only to the pressure switch 11A. Then, in this state, the operator operates the operation lever 8a in either direction to drive the second actuator 6, and the pilot pressure is output from the pilot valve 8, and this is transmitted to one of the pilot lines c and d. Then, the pressure switch 11A is closed by the pilot pressure guided through the shuttle valve 12A, and the alarm 13 is activated. Accordingly, when the movable contact v is brought into contact with the fixed contact w, the alarm 13 operates only on condition that the second actuator is in the operating state. In this case, the pressure switch 11A
Has a function as detecting means for detecting that the actuator 6 is in the operating state and activating the alarm 13. When the movable contact v is brought into contact with the fixed contact y, the electric circuit of the alarm is connected only to the pressure switch 11, and
The same operation as that of the conventional alarm device for a construction work machine described above is achieved, and the alarm 13 operates only when the first actuator 4 is in the operating state. Further, when the movable contact v is brought into contact with the fixed contact x,
The electric circuit of the alarm 13 is connected to both the pressure switch 11 and the pressure switch 11A, and the alarm 13 is operated on the condition that at least one of the first actuator 4 and the second actuator 6 is in the operating state. It will be. Note that when the movable contact v is brought into contact with the play contact z, the movable contact v is not used as a matter of course. By selecting the fixed contacts w, x, and y that contact the movable contact v in this manner, the operating conditions of the alarm 13 can be changed in various ways.

In the alarm device for a construction work machine according to the embodiment of the present invention, when the pilot pressure is output from the pilot valves 7 and 8, the closing operation is performed, whereby the actuators 4 and 6 are closed.
Pressure switches 11, 11A as detecting means for detecting that the pressure switch is in the operating state and activating the alarm 13.
By performing an operation of bringing the movable contact v into contact with desired fixed contacts w, x, and y, these pressure switches 11, 11
A switching switch 14 is provided as operating means for selecting a pressure switch to activate the alarm 13 from A.
Since the same alarm device 13 can be selectively operated with a desired pressure switch, one alarm device 13 can be operated under various conditions according to the type of work and the situation at the work site. Can respond to the needs of the site.

In the embodiment described above, only two actuators for issuing an operation alarm are shown for convenience of explanation, but the present invention does not prevent an increase in the number. Further, in the embodiment, the operation means capable of selecting the detector for operating the alarm device under the condition of OR is shown. However, if necessary, this can be selected under other conditions such as AND. As described above, the operating means can be embodied. Further, in the embodiment,
A pressure switch for detecting that the actuator is in the operating state by using the pilot pressure of the pilot valve as a medium is used, but instead of this pressure switch, the operation at the time of operating the operation lever is mechanically transmitted and the switch is operated to close. For example, pure mechanical detection means can be used as the detection means. Therefore, it is not always necessary to use a pilot valve for the actuator operating means than in the embodiment. In the embodiment, the operation of the actuator is detected by operating the pilot valve. However, the movement of the actuator can be directly detected.

[0017]

As is apparent from the above description, according to the present invention, in an alarm device for a construction work machine used for a construction work machine having a plurality of actuators and for issuing a warning of the operation of the actuator, the actuator comprises: Providing a plurality of detecting means for detecting that it is in an operating state and activating the alarm, and operating means for selecting a detecting means to activate the alarm from the plurality of detecting means, and operating the operating means By doing so, the same alarm device can be selectively activated by desired detection means, and an alarm can be issued according to the type of work or the situation at the work site.
So that you can change the conditions for operating the vessel ,
ADVANTAGE OF THE INVENTION According to this invention, one alarm can be operated on various conditions according to the kind of work, the situation of a work site, etc., and the alarm device for construction work machines which can respond immediately to the needs of the site
Is obtained.

[Brief description of the drawings]

FIG. 1 is a hydraulic circuit diagram of an alarm device for a construction work machine according to an embodiment of the present invention.

FIG. 2 is a hydraulic circuit diagram relating to an alarm device for a construction work machine of a conventional example.

[Explanation of symbols]

 3,5 Control valve 4,6 Actuator 7,8 Pilot valve 11,11A Pressure switch 12,12A Shuttle valve 13 Alarm 14 Switching switch a, b, c, d Pilot line

Claims (1)

(57) [Claims] 1. An alarm device for a construction work machine used for a construction work machine having a plurality of actuators and for issuing an alarm for operation of the actuator, for detecting that the actuator is in an operation state and activating an alarm device. A plurality of detecting means, and an operating means for selecting a detecting means to activate the alarm device from among the plurality of detecting means, and operating the operating means, the same alarm device can be detected by a desired detecting means. It can be selectively activated, and depending on the type of work and the situation at the work site, etc.
An alarm device for a construction work machine, wherein a condition for activating a container can be changed .