JP2002294762A - Monitor camera device for construction machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve operating efficiency by eliminating the interruption of operation by automatically changing over an image in response with operation of an operator. SOLUTION: In a monitor camera device for construction machinery having a rear monitor camera 12 monitoring the rear of the construction machinery and a front monitor camera 11 monitoring a front and selectively projecting the images by each monitor camera 11 and 12 onto one display 10, the monitor camera device has a pressure switch 59 detecting the execution of traveling operation and outputting a traveling detecting signal and a changeover circuit 60 changing over the image projected onto the display 10 from the image by the front monitor camera 11 to the image by the rear monitor camera 12 when the traveling detecting signal from the pressure switch 59 is at on.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surveillance camera device for a construction machine for switching and displaying one of images from a plurality of surveillance cameras arranged around a construction machine such as a hydraulic shovel on a display in a cab.

[0002]

2. Description of the Related Art As a surveillance camera device for a construction machine described above, video signals from surveillance cameras provided at two locations in front of and behind a hydraulic excavator are both transmitted to a display in a driver's cab. There has been known a configuration in which an operator selects one of the video signals with a selector so that the selected video signal is displayed on a display (Japanese Utility Model Application Laid-Open No. 7-20354).

[0003] According to this surveillance camera device, work such as excavation can be performed while watching the image from the front surveillance camera displayed on the display, while the image from the rear surveillance camera displayed on the display during reverse travel. , It is possible to confirm the rear view.

[0004]

However, in the surveillance camera device described above, when the operator selects the image of the front surveillance camera and works while looking at the display, he or she tries to check the rear to move the hydraulic shovel backward. , The operator must interrupt the excavation operation, operate the selector, and switch the video displayed on the display,
There is a problem that work is interrupted and work efficiency is reduced.

[0005] In addition, for example, when the excavation hole is expanded or the ground surface around the hole is maintained, the operation of gradually moving forward / backward and the operation of excavation are repeated alternately. If the switching operation is neglected in order to save time and effort, safety confirmation at the time of retreat cannot be obtained.

[0006] The present invention has been made in view of such problems of the prior art, and eliminates interruption of work by automatically switching images according to an operation by an operator. It is an object of the present invention to provide a surveillance camera device for a construction machine capable of improving work efficiency.

[0007]

A surveillance camera apparatus for a construction machine according to the present invention includes a plurality of surveillance cameras including a specific surveillance camera for photographing a specific area of a construction machine, and a plurality of images obtained by each of these surveillance cameras. A display for displaying one of the above, detection means for detecting that an operation requiring monitoring of the specific area has been performed, and displaying a display image on the display when the operation is detected. Switching means for automatically switching to an image from a specific surveillance camera.

In the case of the surveillance camera device according to the present invention, when a specific operation (running operation in claim 2) is performed, an image displayed on the display is monitored in association with the operation. Since the camera image is automatically switched to the camera image of the necessary area (the image of the rear monitoring camera in claim 2), the operation of switching the image can be omitted.
Work efficiency is improved. Further, every time a specific operation is performed, the image projected on the display is switched to the image of the specific surveillance camera, so that the safety can be improved.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a front view showing an excavator to which a surveillance camera device for a construction machine according to the present invention is applied, FIG. 2 is a view of an operator's cab provided in the excavator, and FIG. FIG. 4 is a diagram showing a mounting position of a front monitoring camera, FIG. 5 is a diagram showing a mounting position of a rear monitoring camera, and FIG. 6 is a diagram showing a configuration of a hydraulic circuit provided in the excavator. FIG. 7 is a diagram showing a configuration of a switching circuit (switching means) for electrically switching an image to be displayed on a display provided in a cab.

The excavator shown in FIG. 1 has a lower traveling body 1, an upper revolving body 2 rotatably provided thereon, and a boom 3
A multi-stage telescopic core 4 attached to the end of the boom 3, an excavation bucket 5 attached to the end of the telescopic boom 4, and a vicinity of the excavation bucket 5 attached to the end of the boom 3. Forward monitoring camera 11,
The counter weight 2a is provided behind the upper swing body 2.
And a rear monitoring camera 12 that is positioned above the vehicle and monitors the rear of the aircraft.

The inside of the cab 2b of the excavator is
As shown in FIG. 2, a plurality of operation units for operating each unit, for example, a left operation lever 6a, a right operation lever 6b, a boom offset operation pedal 6c, a left traveling lever 7, a right traveling lever 8, a display 10, and the like are provided. Is provided.

The left travel lever 7 and the right travel lever 8 are shown in FIG.
As shown in the figure, it is possible to control the left and right running state independently, to move forward when tilted forward, to reverse when tilted forward, and to stop running when returning to the neutral position Operated. The display 10 displays one of video signals from the front monitoring camera 11 and the rear monitoring camera 12.

As shown in FIG. 4, the front surveillance camera 11 is attached to the lower part of the end of the boom 3 so as to be able to monitor the vicinity of the excavation bucket 5, so that the interior of the excavation hole can be monitored. ing. On the other hand, as shown in FIG. 5, the rear monitoring camera 12 is mounted on a bracket 14 for mounting an illumination light 13 provided at a rear portion of the upper swing body 2 so that the rear view of the aircraft can be confirmed. Has become.

Both the video signals picked up by the front monitoring camera 11 and the rear monitoring camera 12 are given to the display 10 via a switching circuit 60 to be described later.
The switching operation of the switching circuit 60 is performed based on a signal from the traveling operation circuit shown in FIG.

In FIG. 6, when the engine E is driven, the hydraulic pumps P1, P2 and the pilot pump P3 operate.

The hydraulic oil discharged from the hydraulic pump P1 passes through a straight travel valve 24, a control valve 25 for a right traveling motor, a control valve 26 for a bucket, and a control valve for a boom arranged on a center bypass line LC on the left side in the figure. Valve 27 and cut valve 28
Supplied to The right travel motor control valve 25 is for driving the right travel hydraulic motor 29 forward or backward, the bucket control valve 26 is for driving the bucket cylinder 32 to expand and contract, and the boom control valve 27 is for the boom cylinder 33.
The cut valve 28 is used to flow the pressure oil to the right side center bypass line RC.

On the other hand, the pressure oil discharged from the hydraulic pump P2 passes through the straight travel valve 24, and passes through the center bypass line R.
It is supplied to the control valve 35 for the left running motor, the control valve 36 for turning, the control valve 37 for the arm, and the cut valve 38 arranged on C. The left travel motor control valve 35 drives the left travel hydraulic motor 39 forward or backward, and the swing control valve 36 drives the hydraulic motor 40 that swings the upper swing body 2, and the arm control valve 37. Is the arm cylinder 4
The cut valve 38 is for driving the pressure oil to the left side of the center bypass line LC.

The traveling straight valve 24 has two switching positions, and when in the first switching position, pressurized oil from the hydraulic pump P1 is supplied to the center bypass line LC side and the hydraulic pump P2
From the center bypass line RC. When the boom 3 and the arm 4 are operated in a state where the left and right traveling levers 7 and 8 are operated at the same position, for example, the second switching position is switched from the first switching position to the second switching position so that traveling straightness can be maintained. The position is switched to the switching position, and the hydraulic oil from the hydraulic pumps P1 and P2 flows in parallel to both center bypass lines LC and RC.

The pressure oil discharged from the pilot pump P3 controls the switching positions of the remote control valves 50 and 51 for controlling the switching position of the control valve 25 for the right traveling motor and the switching valve 35 for the left traveling motor. It is used as a pressure source for various kinds of control including the remote control valves 52 and 53 to. The right travel motor control valve 25
Has a forward switching position a, a neutral position b, and a reverse switching position c. The left traveling motor control valve 35 also has a forward switching position d, a neutral position e, and a reverse switching position. Switching position f.

When the right travel lever 8 is tilted forward, the pilot pressure is derived from the remote control valve 50, and the control valve 2 for the right travel motor is transmitted via the pilot line 55a.
5 is switched from the neutral position b to the switching position a, and the right travel lever 8 is tilted backward, the pilot pressure is derived from the remote control valve 51, and the control valve 25 for the right travel motor is moved through the pilot line 55b to the neutral position. Switch from b to switching position c.

When the left running lever 7 is tilted forward,
When the pilot pressure is derived from the remote control valve 52, the control valve 35 for the left traveling motor is switched from the neutral position e to the switching position d via the pilot line 54a, and the left traveling lever 7 is tilted to the reverse side. The pilot pressure is derived from the pilot line 5
The left traveling motor control valve 35 is switched from the neutral position e to the switching position f via 4b.

A shuttle valve 56 is provided in an oil passage connecting the pilot lines 54a and 54b,
A shuttle valve 57 is provided in the oil passage communicating between 5a and 55b, and a shuttle valve 58 for selecting the shuttle valves 56 and 57 at a higher position is provided.
On the downstream side of 8, a pressure switch 59 is provided as detecting means. The pressure switch 59 is connected to the shuttle valve 5
When detecting the pilot pressure derived through 6 or 57 and the shuttle valve 58, the hydraulic pressure signal is converted into an electric signal. That is, the traveling levers 7, 8
When any one of the forward and backward operations is performed, a trigger signal is output to a switching circuit 60 described later. In this embodiment, the reason why both forward and backward operations are detected is that consideration is given to the case where the upper swing body 2 is turned 180 ° to move forward or backward.

The running detection signal output from the pressure switch 59 is given to an electric circuit built in the display 10 shown in FIG. This electric circuit includes a switching circuit (switching means) 60 having a relay for switching both video signals from the front monitoring camera 11 and the rear monitoring camera 12, and the switching circuit 60 includes a trigger signal from the pressure switch 59. Is input and the front monitoring camera 11
The video signal captured by the rear monitoring camera 12 is input. However, the switching circuit 60 normally performs a switching operation so that the video from the front monitoring camera 11 is displayed on the display 10.

When the running detection signal from the pressure switch 59 is turned on, the switching circuit 60 displays the display 1 until then.
The image from the front surveillance camera 11 shown in 0 is switched to the image captured by the rear surveillance camera 12. Thereafter, when the travel lever is returned to the neutral position and the travel detection signal is no longer input from the pressure switch 59, the switching circuit 60 displays the image from the rear monitoring camera 12 previously displayed on the display 10 to the front monitoring camera. The image is switched to 11.

Therefore, according to the present embodiment,
When the travel levers 7 and 8 are operated, the pressure switch 59 as a detecting means detects the operation and outputs an ON electric signal, and the switching circuit 60 as the switching means displays an image displayed on the display 10 with a forward monitoring camera. 11 automatically switches to the rear monitoring camera 12, and when the operation of the traveling levers 7 and 8 is stopped, the image from the rear monitoring camera 12 is automatically switched to the image from the front monitoring camera 11, so that a plurality of monitoring cameras The manual switching operation can be omitted, and the work efficiency can be improved. Also,
Each time the operation of the travel levers 7 and 8 is performed, the image projected on the display 10 is automatically switched from the front monitoring camera 11 to the rear monitoring camera 12, so that safety can be improved.

In the above-described embodiment, the sequence control is performed by using the switching circuit 60 having a relay to switch the video signal captured by the front monitoring camera and the rear monitoring camera. However, the present invention is not limited to this. Can also be controlled by software using.

In the above-described embodiment, the operation pressure of the remote control valve is detected and converted into an electric signal (running detection signal). However, the operation of the remote control valve is controlled using a microcomputer. In such a case, a configuration may be employed in which a plurality of monitoring cameras are switched based on a control signal output from the microcomputer.

Further, in the above-described embodiment, the rear of the construction machine is set as a specific area, and the display is automatically switched to the image from the rear monitoring camera 12 during the traveling operation. Various changes can be made according to the type and the like. For example, in a construction machine such as a hydraulic shovel or a crane where a turning operation is frequently performed, the side of the machine is set as a specific area, and a monitor image is displayed by a side monitoring camera during the turning operation, and a display image of a display is an image of the side monitoring camera. Automatically.

[0030]

As described above in detail, in the case of the present invention, when a specific operation (running operation in claim 2) is performed, an image displayed on the display is related to the operation. Since it is automatically switched to the camera image of the area requiring monitoring (in claim 2, the image of the rear monitoring camera),
It is possible to omit the operation of switching the video, and the work efficiency is improved. Further, every time a specific operation is performed, the image projected on the display is switched to the image of the specific surveillance camera, so that the safety can be improved.

[Brief description of the drawings]

FIG. 1 is a front view showing an excavator to which a surveillance camera device for a construction machine according to the present invention is applied.

FIG. 2 is a view of an operator cab provided in the excavator of FIG. 1 as viewed from an operator side.

FIG. 3 is a diagram showing an operation state of a traveling lever provided in the excavator of FIG.

FIG. 4 is a view showing a mounting position of a forward monitoring camera provided in the excavator of FIG. 1;

FIG. 5 is a view showing a mounting position of a rear monitoring camera provided in the excavator of FIG. 1;

6 is a diagram showing a configuration of a hydraulic circuit provided in the excavator of FIG.

FIG. 7 is a diagram showing a configuration of a switching circuit for electrically switching an image displayed on a display provided in the excavator of FIG. 1;

[Explanation of symbols]

 7 Left traveling lever 8 Right traveling lever 10 Display 11 Forward monitoring camera 12 Rear monitoring camera 50, 51, 52, 53 Remote control valve 54a, 54b, 55a, 55b Pilot line 56, 57, 58 Shuttle valve 59 Pressure switch (detection means) 60 switching circuit (switching means)

Continued on the front page F term (reference) 2D015 HA00 HB00 3D020 BA05 BA20 BB07 BC03 BC13 BD03 BD09 BE01 5C054 AA01 FE01 FE02 FE21 HA30

Claims (2)

[Claims] 1. A plurality of surveillance cameras including a specific surveillance camera for photographing a specific area of a construction machine; a display for displaying one of a plurality of images by each of the surveillance cameras; Detecting means for detecting that an operation requiring monitoring of the camera has been performed, and switching means for automatically switching a display image on the display to an image by the specific monitoring camera when the operation is detected. A surveillance camera device for a construction machine, comprising: 2. The construction machine monitoring camera device according to claim 1, wherein a rear surveillance camera for photographing the rear of the construction machine as a specific surveillance camera detects traveling operation of the construction machine as a detection unit. A monitoring camera for a construction machine, wherein the switching means is configured to automatically switch a display image on a display to an image from the rear monitoring camera when a traveling operation is detected. apparatus.