JP2009191461A - Height restricting device for heavy machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a height restricting device for a heavy machine capable of preventing a working machine of the heavy machine from coming into contact with an existing elevated object by using an ultrasonic sensor easily and securely. <P>SOLUTION: The ultrasonic sensor 13 is installed by directing it toward a scope of swing of a boom 8 of the working machine 6 on an outer side face of a driver's cab 7 of a back hoe 3 in a back hoe dredger 1, and an alarm generating means (an alarm 16) for detecting the intrusion of the boom 8 into a sensing area S of the ultrasonic sensor 13 and giving warning sound is provided in the driver's cab 7. The sensing area S is aligned with a position of the boom 8 when the working machine 6 reaches a danger line L set below the existing elevated object 12 to generate the warning sound from the alarm 16 when the working machine 6 reaches the danger line L so that a driver M can operate the working machine 6 to avoid its contact with the existing elevated object 12 immediately. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a height limiting device for avoiding a risk that a work machine of a heavy machine contacts an existing elevated structure.

  For example, when dredging the lower water area of an existing elevated structure such as a sluice or bridge with a backhoe dredger, it is necessary to carefully work so that the work equipment of the backhoe (heavy equipment) mounted on the trolley does not contact the existing elevated structure. There is. However, in the past, warning display and alerting by the arrangement of monitoring personnel were generally used, and it was insufficient as a contact avoidance measure for existing elevated structures. Also, in land construction under existing viaducts such as viaducts and overhead lines, reliance is placed on warning indications and alerts by the placement of observers, which is not sufficient as a contact avoidance measure for existing overpasses. It was.

In Patent Document 1, an ultrasonic sensor is attached to the upper swing body (work machine body) or arm (work machine) of a hydraulic excavator, and when a person or an obstacle enters the detection area of the ultrasonic sensor, However, there is no example of using an ultrasonic sensor for avoiding contact of a work machine with an existing elevated structure.
Japanese Patent Laid-Open No. 5-17973

  The present invention has been made in view of the above-described technical background, and the problem is that the risk that the working machine of a heavy machine contacts an existing elevated object can be easily and reliably avoided using an ultrasonic sensor. It is to provide a height limiting device.

  In order to solve the above problems, the present invention is such that an ultrasonic sensor is attached to a working machine body of a heavy machine toward a swinging region of the boom of the working machine, and the boom has entered the sensing area of the ultrasonic sensor. An alarm generating means for detecting an alarm and generating an alarm sound is provided around a cab on the work machine body.

  In the heavy equipment height restriction device configured in this way, the work equipment is set in advance by setting the sensing area of the ultrasonic sensor in accordance with the boom position when the work equipment reaches the dangerous contact area for the existing elevated object. When the contact risk area is reached, an alarm sound is emitted from the alarm generation means, and the driver can immediately perform the contact avoidance operation.

  In the present invention, it is desirable that the ultrasonic sensor is installed with the sensing area aligned with the boom position when the work implement reaches the danger line set below the existing elevated structure. When the ultrasonic sensor is installed in this manner, an alarm sound is emitted when the work implement reaches the danger line, so that the driver can perform a contact avoidance operation with a margin.

  In the present invention, the heavy machine may be a backhoe mounted on a dredger boat, and a detection area of the ultrasonic sensor may be changed according to a water level. When configured in this manner, contact between the work implement and the existing elevated object can be reliably avoided even in a water area where the fluctuation of the water level is large.

  In the present invention, in addition to the above-described configuration, the ultrasonic sensor for the main body is installed upward on the roof of the cab of the main body of the work machine, and an existing elevated object has entered the detection area of the ultrasonic sensor for the main body. Main body alarm generating means for detecting this and generating an alarm sound can be installed around the cab of the work machine main body. When configured in this manner, a warning sound is generated even when the water level rises and the work implement main body abnormally approaches the existing elevated structure, so that the danger of the work implement main body inadvertently contacting the existing elevated structure is avoided. be able to.

  According to the height restriction device for heavy equipment according to the present invention, the danger that the work equipment of the heavy equipment may come into contact with the existing elevated object can be easily and reliably avoided by using the ultrasonic sensor, so that the construction under the existing elevated object can be safely performed. Can be done.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

  1 and 2 show a backhoe dredger equipped with a height limiting device as a first embodiment of the present invention. In FIG. 1, a backhoe dredger indicated by 1 is a backhoe (heavy equipment) on a carriage 2. 3 is installed. The backhoe 3 includes a base 4, a work machine main body 5 provided on the base 4 so as to be rotatable, a work machine 6 attached to the work machine main body 5, and a cab 7 installed on the work machine main body 5. It is made up of. The work machine 6 includes a boom 8, an arm 9 that is rotatably connected to the tip of the boom 8, and a bucket 10 that is rotatably connected to the tip of the arm 9. The arm 9 and the bucket 10 are operated by a lever operation by the driver M via cylinders 11a, 11b, and 11c provided in correspondence with each other.

  Here, the backhoe dredger 1 performs dredging in the lower water area of an existing elevated object 12 such as a sluice or a bridge, and the bottom sediment that has been scooped into the bucket 10 by the movement of the work machine 6 is the boom 8. Is lifted, the arm 9 is extended, and the work machine main body 5 is swung. The mud is discharged to an earth ship (not shown) disposed adjacent to the backhoe dredger 1.

  By the way, in the dredging work under the above-described existing elevated body 12, when the boom 8 of the backhoe 3 is inadvertently raised, a part of the boom 8 comes into contact with the existing elevated body 12, causing the existing elevated body 12 to be destroyed. There is a danger of end. The height limiting device according to the present embodiment is for avoiding the contact of the boom 8 of the backhoe 3 with the above-described existing elevated object 12, and here, as shown in FIG. An ultrasonic sensor 13 attached to the outer surface of the operator cab 7 toward the swinging region of the boom 8, and detecting that the boom 8 has entered the sensing area S of the ultrasonic sensor 13 generates an alarm sound. The alarm generating means 14 is schematically configured.

  The ultrasonic sensor 13 is a reflection type that can transmit and receive ultrasonic waves here, and the boom when the work implement 6 reaches the danger line L set on the lower side of the existing elevated object 12 is used. The sensing area S is installed at the position 8. The ultrasonic sensor 13 is detachable with a magnet, and its installation location is changed according to the water level. More specifically, when the water level is low, the installation location of the ultrasonic sensor 13 is changed in a direction to move the sensing area S away from the boom 8, thereby expanding the swing allowable range of the boom 8. On the other hand, when the water level is high, the installation location of the ultrasonic sensor 13 is changed in a direction to bring the sensing area S closer to the boom 8, thereby reducing the swing allowable range of the boom 8. The installation location of the ultrasonic sensor 13 is the window frame of the cab 7 in the illustrated example, but may be a separate mounting plate attached to the window frame. In this case, as shown in FIG. 4, by attaching a scale 18 corresponding to the water level to the mounting plate 17, the mounting location of the ultrasonic sensor 13 can be easily changed according to the water level.

  As shown in FIG. 3, the alarm generating means 14 constituting the height limiting device includes a controller 15 that takes in a signal from the ultrasonic sensor 13 and an alarm device that emits an alarm sound in response to a command from the controller 15. (Buzzer) 16 The controller 15 receives the signal from the ultrasonic sensor 13, detects that the boom 8 of the work machine 6 has entered the detection area S, and outputs an alarm sound generation command to the alarm device 16. In this embodiment, the alarm device 16 is installed in the cab 7, and the driver M can immediately recognize the danger of contact. In addition, when using the alarm 16 with a high sound volume, it is needless to say that it may be installed at an appropriate place outside the cab 7.

  Hereinafter, dredging work by the backhoe dredger 1 equipped with the height restriction device will be described.

  During dredging work, the work machine 6 of the backhoe 3 is raised in advance under the existing elevated object 12 and when the work machine 6 reaches the danger line L, it is confirmed whether or not an alarm sound is actually emitted from the alarm 16. . If no alarm sound is emitted, the position of the ultrasonic sensor 13 is adjusted and the operation is confirmed again. As described above, the dredging work is performed by operating the work implement 6 by lever operation by the driver M. When the work implement 6 reaches the danger line L during the dredging work, the boom 8 is moved to the ultrasonic sensor 13. , And an alarm sound is emitted from the alarm device 16 in the alarm generating means 14. As a result, the driver M can immediately recognize the danger of contact and can quickly perform the avoidance operation of the work implement 6. In the present embodiment, in particular, when the work implement 6 reaches the danger line L set on the lower side of the existing elevated structure 13, an alarm sound is generated, so that the driver M can perform the avoidance operation with a margin.

  Thus, during the dredging operation, the water level is monitored at regular intervals, and when the water level rises or falls below the preset management height, the direction in which the sensing area S is brought closer to the boom 8 in the manner described above. Or the installation location of the ultrasonic sensor 13 is changed in the direction away from the boom 8. The cycle for changing the installation location of the ultrasonic sensor 13 is determined by the size of the tides in a day, the distance between the existing elevated body 12 and the danger line L, and the like.

  In the first embodiment, the installation location of the ultrasonic sensor 13 is changed according to the water level and the sensing area S is displaced. Instead, a plurality of ultrasonic sensors are arranged in front and rear. It may be arranged in the direction and one of them may be switched and used for each water level. In this case, it is not necessary to replace (reinstall) the ultrasonic sensor 13. Moreover, when using what can change the width | variety of the sensing area S in multiple steps as the ultrasonic sensor 13, if the installation location of the ultrasonic sensor 13 is fixed and the width | variety of the sensing area S is changed according to a water level. Well, cost is reduced compared to multiple installations of ultrasonic sensors.

  Moreover, in the said 1st Embodiment, although the ultrasonic sensor 13 was installed in the outer surface of the driver's cab 7, if the installation place of this ultrasonic sensor 13 is on the working machine main body 5, it is arbitrary, for example, , It can be a rear portion facing the boom 8. In this case, by using the ultrasonic sensor 13 that can change the sensing distance in multiple stages, it is not necessary to replace the ultrasonic sensor according to the water level, and it is not necessary to install a plurality of ultrasonic sensors with different sensing distances. become.

  FIG. 5 shows a backhoe carrier equipped with a height limiting device as a second embodiment of the present invention. The feature of the second embodiment is that in addition to the configuration of the first embodiment described above, the ultrasonic sensor 20 for the main body is installed upward on the roof of the cab 7 on the work machine main body 5. In addition, a main body alarm generating means (not shown) for detecting that the existing elevated object 12 has entered the sensing area S ′ of the main body ultrasonic sensor 20 and generating an alarm sound is provided around the cab 7. It is in.

  In the second embodiment, when the water level rises and the work implement main body 5 abnormally approaches the existing elevated object 12, an alarm sound is generated. Therefore, the driver M unintentionally installs the existing elevated object 12. It is possible to avoid the danger of touching the dam, and to perform the dredging work more safely. The alarm sound in this case is desirably different from the alarm sound of the alarm device 16 (FIG. 3) in the first embodiment (for example, an intermittent sound). It is possible to reliably recognize the abnormal approach of the work machine body 5. The function of the main body alarm generation means may be provided to the alarm generation means 14 (FIG. 3) in the first embodiment, and in this case, the double investment of the alarm generation means becomes unnecessary. This is advantageous in terms of cost.

  Here, although the example applied to the backhoe dredger was shown in said two embodiment, of course, this invention is applicable also to the various heavy equipment of land construction. In this case, the type of the existing elevated object that is a target of contact avoidance is arbitrary, and various elevated objects such as viaducts, bridges, tunnel tops, overhead wires, and gate-type gates are targeted.

It is a side view showing a backhoe dredger equipped with a height limiting device as a first embodiment of the present invention. It is a front view of the backhoe dredger shown in FIG. It is a block diagram which shows the structure of the height limiting apparatus as the 1st embodiment. It is a front view which shows an example of the attachment plate of the ultrasonic sensor which comprises the height restriction apparatus as the 1st embodiment. It is a side view which shows the backhoe dredger equipped with the height restriction | limiting apparatus as the 2nd Embodiment of this invention.

Explanation of symbols

1 Backhoe dredger 3 Backhoe (heavy equipment)
DESCRIPTION OF SYMBOLS 5 Work implement body 6 Work implement 7 Operator's cab 8 Boom 12 Existing elevated object 13 Ultrasonic sensor 14 Alarm generating means 16 Alarm 20 Main body ultrasonic sensor S, S 'Sensing area L Danger line

Claims (4)

  A height limiting device for avoiding a risk that a work machine of a heavy machine comes into contact with an existing elevated object, wherein an ultrasonic sensor is attached to the work machine body toward the swinging region of the boom of the work machine, and the ultrasonic sensor An apparatus for limiting the height of a heavy machine, wherein alarm generating means for detecting that the boom has entered the sensing area and generating an alarm sound is installed around a cab on the work machine body.   2. The heavy machine height according to claim 1, wherein the ultrasonic sensor is installed in accordance with a sensing area at a boom position when the work machine reaches a danger line set below an existing elevated structure. Limit device.   3. The heavy machine height restriction device according to claim 1, wherein the heavy machine is a backhoe mounted on a dredger trolley, and a detection area of the ultrasonic sensor is changed according to a water level. .   An ultrasonic sensor for the main body is installed upward on the roof of the cab of the work machine main body, and an alarm sound is generated by detecting that an existing elevated object has entered the sensing area of the ultrasonic sensor for the main body. 4. The heavy machine height restriction device according to claim 3, wherein a main body alarm generating means is provided around a cab of the work machine main body.

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