JP4237538B2 - Construction equipment rearward monitoring device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rear monitoring device for a construction machine, and more particularly to a wide variety of rear monitoring devices using a monitoring camera.
[0002]
[Prior art]
Conventionally, in construction machines such as a hydraulic excavator, the safety of the rear side during turning or reverse traveling is ensured by a turning alarm such as a horn and a back buzzer. However, this turning warning and back buzzer let the people around the construction machine know that they are turning or going backwards. A turn or reverse operation is started as the safety is ensured away from the machine. On the other hand, in the case of an obstacle, it is necessary to visually check whether there is an obstacle. Obstacles on the side of a construction machine such as a hydraulic excavator can be confirmed with a side mirror, etc. Have difficulty.
[0003]
Therefore, in recent years, a rear monitoring device has appeared which can attach a monitoring camera to the rear part of a construction machine such as a hydraulic excavator and can confirm the safety of the rear with a monitor in the cab (for example, see Patent Document 1 and Patent Document 2).
[0004]
[Patent Document 1]
JP 2002-294762 A (pages 2 to 4, FIG. 1, FIG. 5 and FIG. 7)
[Patent Document 2]
Japanese Patent Laid-Open No. 10-14619 (pages 2 to 4 and FIGS. 1 to 3)
[0005]
[Problems to be solved by the invention]
The construction camera monitoring camera device described in Patent Document 1 is provided with a plurality of monitoring cameras (for example, a front monitoring camera and a rear monitoring camera for monitoring an obstacle behind the vehicle body) for monitoring the operation status of the hydraulic excavator and is specified. Switching means for automatically switching to the image from the surveillance camera (for example, the rear surveillance camera) is provided so that the image can be switched and displayed on a display provided in the cab, and further, a display on the display is displayed when a driving operation is detected. The image is automatically switched to the image from the rear monitoring camera. Specifically, when the traveling lever is operated, the pilot pressure acts on the pressure switch via the traveling remote control valve, and the pressure switch Switching circuit (switching means) for switching the video signal from the front monitoring camera and the rear monitoring camera according to the travel detection signal output from There is no description about means for changing the turning direction of the surveillance camera according to the turning direction of the upper turning body and no description about turning or swinging of the monitoring camera. In addition, there is no disclosure about the relationship with rocking. On the other hand, in Patent Document 2, a surveillance camera is installed in a counterweight at the rear of the vehicle body so as to be able to turn, and the rear or side portion of the vehicle body is photographed by one surveillance camera, and the image is displayed on a display monitor device in the cab. Although a rear monitoring device for a hydraulic excavator that can be displayed is disclosed, the rear monitoring device disclosed in Patent Document 2 is a rear surface portion of a counterweight so that the monitoring camera does not protrude from the rear end radius. Alternatively, at least one of the side portions is provided with a notch opening, and a surveillance camera is provided inside the notch, and the surveillance camera is provided so as to be able to turn, but there is no description regarding the oscillation of the surveillance camera, Further, there is no description about means for changing the turning direction of the monitoring camera according to the turning direction of the upper turning body. As a result, the inventions disclosed in Patent Literature 1 and Patent Literature 2 are difficult to perform a wide variety of rear-view monitoring using a surveillance camera, and cannot be said to be sufficiently functioning as a rear-view monitoring device. It was.
[0006]
Therefore, the surveillance camera can be turned and photographed in conjunction with the operation of the turning or traveling operation lever, the turning direction of the monitoring camera can be switched by the turning direction of the upper turning body, and the operation lever By enabling photographing with a surveillance camera regardless of the operation, and also allowing the surveillance camera to swing, various and wide-ranging technical problems that should be monitored arise. Aims to solve this problem.
[0007]
[Means for Solving the Problems]
The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is characterized in that an upper swing body is mounted on a lower traveling body so as to be rotatable, and one front portion of the upper swing body is provided. A construction machine in which a cab is provided at the rear, a counterweight is provided at the rear, and a monitoring camera mounted on the counterweight and a monitor provided in the cab are connected by a cable,
A pressure switch is provided in a pipe branched from a pilot pipe connecting a pilot control part of the directional switching valve for supplying pressure oil to the actuator and a remote control valve for deriving the pilot pressure to the pilot control part of the directional switching valve; A pressure switch is connected to the control device, and a motor driving device and a monitoring camera for driving the electric motor by turning the monitoring camera are connected to the control device, and the monitoring is interlocked with an operation of an operation lever for switching the remote control valve. In the rear monitoring device of a construction machine that allows the camera to turn and shoot ,
It is a rear monitoring device for a construction machine that is controlled by the control device so that the monitoring camera turns at a predetermined angle in a direction opposite to the turning direction of the upper turning body and ensures a rear view on the opposite side to the turning direction. .
[0008]
Further, an invention according to claim 2, wherein, while allowing the pivoting of the surveillance camera and the shooting regardless of the operation of the operation lever, and connected to selection means capable of selecting the turning direction of the surveillance camera to the controller according The construction machine rear monitoring device according to Item 1 ,
According to a third aspect of the present invention, there is provided the rear monitoring apparatus for a construction machine according to the first or second aspect , wherein the surveillance camera is swingably attached to a counterweight via a pedestal .
[0009]
The invention of claim 4, wherein connects one end of the push-pull cable to the base, the push-pull cable to extend the cab, enables the oscillation of the monitoring cameras from the cab and claims 3 Ru rear monitoring apparatus der for a construction machine described.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is an overall side view of a hydraulic excavator employing a rear monitoring device according to the present invention, and FIG. 2 is an electric / hydraulic circuit diagram of the rear monitoring device according to an embodiment of the present invention. FIG. 3A is a side view of mounting of the surveillance camera according to the embodiment of the present invention, and FIG. 3B is a plan view of mounting of the surveillance camera according to the embodiment of the present invention. FIG. 4 is a diagram showing a swinging (swinging) state of the surveillance camera according to the embodiment of the present invention, and FIG. 5 is a cable wiring diagram of the surveillance camera according to the embodiment of the present invention.
[0011]
In FIG. 1, reference numeral 1 denotes a lower traveling body, and an upper swing body 2 is mounted on the lower traveling body 1, and an attachment 3 is attached to the front center of the upper swing body 2 so as to be able to move up and down. A cab 4 is placed on the front side of the upper swing body 2, and a counterweight 5 is attached to the rear of the upper swing body 2.
[0012]
In FIG. 2, the main hydraulic pump 6 is connected to a hydraulic motor 8 via a direction switching valve 7. Moreover, the pilot control parts 7a and 7b of the direction switching valve 7 are connected to the pilot pump 10 via the remote control valve 9 operated by the operation lever 9a. Pressure switches 13a and 13b are provided on branch pipes 12a and 12b branched from pilot pipes 11a and 11b connecting the remote control valve 9 and the pilot control sections 7a and 7b of the direction switching valve 7, and the pressure switches 13a and 13b are connected. The motor drive device 15 is connected to the control device 14, and the motor drive device 15 is connected to the motor drive device 15. The monitoring camera 16 is connected to the control device 14 and is connected to a monitor 18 provided in the cab 4 by a cable. The control device 14 is linked to the operation of an operation lever 9a for switching the remote control valve 9. A selection means 19 is connected to select whether the surveillance camera 16 can be turned and photographed or the surveillance camera 16 can be turned and photographed regardless of the operation of the operation lever 9a. . The selection means 19 can also switch the turning direction of the monitoring camera 16.
[0013]
3a and 3b, a horizontal member 20a constituting the bracket 20 is fixed on the counterweight 5, and vertical members 20b and 20b are erected on the horizontal member 20a, and an electric motor is mounted on the vertical members 20b and 20b. A pedestal 21 to which 17 is attached is pivotally supported by pins 22 and 22 so as to be swingable. And the monitoring camera 16 is attached to the output shaft 17a of the electric motor 17 so that rotation is possible. Further, a push-pull cable 23 having a roller 20c rotatably attached between the vertical members 20b and 20b of the bracket 20 at a position where it does not interfere below the electric motor 17 and having one end fixed to one corner of the base 21 is provided. The outer layer portion 23a of the push-pull cable 23 is fixed to a member 20d erected on the horizontal member 20a of the bracket 20 so as to be in contact with the roller 20c so that the base 21 can be smoothly swung. ing.
[0014]
In FIG. 4, the push-pull cable 23 is pulled to swing the pedestal 21 and the surveillance camera 16 is inclined downward.
[0015]
FIG. 5 shows the wiring of the push-pull cable 23 attached at one end to the base 21 to which the monitoring camera 16 and the electric motor 17 are attached, and the wiring connecting the monitoring camera 16 and the monitor 18 provided in the cab 4. The push-pull cable 23 is fixed to a control stand 24 provided in the cab 4 with an outer layer portion 23a of the push-pull cable 23, and the other end of the push-pull cable 23 is attached by a lever 25 so as to be slidable in the vertical direction.
[0016]
Next, the operation of the present invention and the technology closely related to the present invention will be described.
In the technical form closely related to the first aspect of the present invention, when the operation lever 9a is operated, the pilot pressure of the pilot pump 10 is set to one of the pilot control portions 7a and 7b of the direction switching valve 7 via the remote control valve 9. As a result, the direction control valve 7 is switched, and the pressure oil of the main hydraulic pump 6 is led to the turning or traveling hydraulic motor 8. On the other hand, the pilot pressure from the pilot pump 10 flowing into the pilot pipes 11a and 11b via the remote control valve 9 is also led to the branch pipes 12a and 12b, and the pressure switches 13a and 13b are operated. Then, the signals of the pressure switches 13a and 13b are guided to the control device 14, a signal for driving the electric motor 15 to the motor driving device 15 is output from the control device 14 and a signal is derived to the surveillance camera 16, The surveillance camera 16 turns and starts photographing. Then, an image captured by the monitoring camera 16 is transmitted to the monitor 18. As a result, the video behind the construction machine such as a hydraulic excavator taken by the monitoring camera 16 can be displayed on the monitor 18 provided in the cab just by operating the operation lever 9a.
[0017]
Then, in the first aspect of the present invention, although in conjunction with the operation of the operation lever 9a those enabling turning and shooting of the monitoring camera 16, a direction opposite to the turning direction of the upper swing structure 2 Since the control camera 14 controls the surveillance camera 16 so as to turn at a predetermined angle, the diagonal weight of the counterweight 5 on the side opposite to the turning direction, that is, the side where the attachment 3 and the cab 4 approach is A picture is taken and displayed on the monitor 18. Therefore, it is possible to prevent interference and collision between the obstacle and the attachment 3 in advance.
[0019]
According to the second aspect of the present invention, the selection unit 19 enables the photographing by the monitoring camera 16 in conjunction with the operation of the operation lever 9a, or the photographing by the monitoring camera 16 regardless of the operation of the operation lever 9a. Can be selected, and various rear monitoring can be performed.
[0020]
Further, according to the third and fourth aspects of the invention, the surveillance camera 16 can be swung from the cab, and when the lever 25 is pulled upward, the push-pull cable 23 covered with the outer layer portion 23a is pulled, and the electric motor 17 and The pedestal 21 to which the surveillance camera 16 is attached swings around the pin 22 as a fulcrum, and the surveillance camera 16 swings downward. On the other hand, when the lever 25 is pushed down, the push-pull cable 23 is pushed, the pedestal 21 is swung, and the surveillance camera 16 is lifted upward, so that a wide range of backward monitoring can be performed.
[0021]
The present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified one.
[0022]
【The invention's effect】
According to the present invention, the configuration described in detail in the above-described embodiment enables the surveillance camera to be turned and photographed in conjunction with the operation of the operation lever, and the surveillance camera to be turned and taken regardless of the operation of the operation lever. Since it is possible to take a picture and the selection means to select the turning direction of the surveillance camera is provided, more diverse rear monitoring is possible, and the surveillance camera can be swung from the driver's cab, so it can be used in a wider range. This makes it possible to monitor the rear of the vehicle, and to achieve excellent effects such as easily ensuring safety during turning and running.
[Brief description of the drawings]
FIG. 1 is an overall side view of a hydraulic excavator employing a rear monitoring device according to the present invention.
FIG. 2 is an electric / hydraulic circuit diagram of the rear monitoring apparatus according to the embodiment of the present invention.
FIG. 3A is a side view of attachment of a surveillance camera according to an embodiment of the present invention.
(B) The attachment top view of the surveillance camera which concerns on embodiment of this invention.
FIG. 4 is a diagram showing a swinging (swinging) state of the surveillance camera according to the embodiment of the present invention.
FIG. 5 is a cable wiring diagram of the surveillance camera according to the embodiment of the present invention.
[Explanation of symbols]
4 Operator's cab 5 Counterweight 9 Remote control valve 9a Operation lever 11a, 11b Pilot pipe line 12a, 12b Branch pipe line 13a, 13b Pressure switch 14 Control device 15 Motor drive device 16 Monitoring camera 17 Electric motor 18 Monitor 19 Selection means 20 Bracket 21 Base 22 Pin 23 Push-pull cable 24 Control stand 25 Lever

Claims (4)

The upper swing body is mounted on the lower traveling body so that the upper swing body can pivot, the operator's cab is provided on one front side of the upper swing body, and the counterweight is provided on the rear side. A construction machine in which a monitor provided in a room is connected by a cable,
A pressure switch is provided in a pipe branched from a pilot pipe connecting a pilot control part of the directional switching valve for supplying pressure oil to the actuator and a remote control valve for deriving the pilot pressure to the pilot control part of the directional switching valve; A pressure switch is connected to the control device, and a motor driving device and a monitoring camera for driving the electric motor by turning the monitoring camera are connected to the control device, and the monitoring is interlocked with an operation of an operation lever for switching the remote control valve. In the rear monitoring device of a construction machine that allows the camera to turn and shoot ,
A construction machine characterized in that the monitoring camera is controlled by the control device so as to turn a predetermined angle in a direction opposite to the turning direction of the upper turning body, and a rear view on the opposite side to the turning direction is secured. Rear monitoring device. 2. The construction according to claim 1 , further comprising a selection means connected to the control device that enables the surveillance camera to turn and shoot regardless of the operation of the operation lever, and to select the turning direction of the surveillance camera. Machine rear monitoring device. 3. The rear monitoring apparatus for a construction machine according to claim 1, wherein the monitoring camera is swingably attached to the counterweight via a pedestal . 4. The construction machine according to claim 3 , wherein one end of a push-pull cable is connected to the pedestal, the push-pull cable is extended to a cab, and the surveillance camera can be swung from the cab . Rear monitoring device.

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