JP2007278025A - Monitor of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a monitor of a construction machine capable of enhancing the safety when the construction machine is operated. <P>SOLUTION: This monitor 11 mounted on a hydraulic shovel comprises a left rear camera 11a for permanently photographing the left rear side of an upper structure, a right rear camera 11b for photographing the right rear side of the upper structure, a monitor screen 42 for displaying the images of the cameras on one screen, and a controller 41 which, when an operator operates an operation lever, selectively enlarges and displays the images of the camera for photographing the opposite side of the operating direction of the operation lever (when a swing operation lever 27 is so operated that the upper structure is turned counterclockwise, the images of the camera 11b for photographing the right rear side of the upper structure is enlarged and displayed, and when the swing operation lever 27 is so operated that the upper structure is turned clockwise, the images of the camera 11a for photographing the left rear side of the upper structure is enlarged and displayed). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a monitoring device for a construction machine that includes a lower traveling body and an upper swinging body that is mounted on the lower traveling body in a swingable state.

  Some construction machines include a lower traveling body and an upper revolving body that is rotatably mounted on the lower traveling body. In such a construction machine, an operator (operator) gets into a driver's cab provided in the upper swing body and operates the operation lever of the travel operation means to move the vehicle body forward or backward. When traveling, the front and sides can be seen with the naked eye of the operator from the window provided in the cab, but when looking at the back of the cab, the head and body are turned around. It was necessary to visually check with a mirror or the like. Also, when turning, the presence or absence of obstacles in the turning range of the turning body was visually recognized in the same manner. However, in the construction machine in which the driver's seat is arranged on one side, There was a problem that it was particularly difficult to see the side opposite to the seat side.

In view of such a problem, a device for displaying an image reflected by a camera on a monitor screen provided in a cab with a rear monitoring camera provided on a counterweight or the like of an upper-part turning body has been put into practical use.
For example, Patent Document 1 discloses a rear monitoring device for a construction machine in which the rear camera rotates in the same direction as the upper traveling body rotates in conjunction with the operation of the turning lever. As a result, it is possible to project a turning range behind the upper turning body that cannot be shown by a rear camera whose monitoring direction is fixed directly behind.
JP 2004-322979 A (published on November 18, 2004)

However, the conventional monitoring device has the following problems.
That is, in the conventional monitoring device, the operation of the turning lever is detected, and the turning of the camera starts after the turning of the upper turning body starts. Therefore, there is a time lag until the actual turning range of the upper turning body is reflected. appear. For this reason, there exists a possibility that an upper revolving body may contact an obstacle immediately after turning, and it is hard to say that it is sufficient in terms of safety.

  The subject of this invention is providing the monitoring apparatus of the construction machine which can further improve the safety | security at the time of operating a construction machine.

  A monitoring device for a construction machine according to a first aspect of the present invention includes a lower traveling body and an upper swinging body that is mounted on the lower traveling body in a swingable state, and operates the lower traveling body and the upper swinging body with an operation lever. A monitoring device attached to a construction machine, including a camera, a monitor screen, and a first display control unit. A plurality of cameras are installed on the upper swing body. The monitor screen displays each image projected by a plurality of cameras on one screen. When the operation lever is operated, the first display control unit enlarges and displays an image of the camera arranged at a position that reflects the direction opposite to the operation direction of the operation lever.

Here, the state of the monitor screen in the normal state in which the images displayed by the plurality of cameras arranged behind the upper swing body are displayed on one screen is the same as the operation direction of the operation lever when the operation lever is operated. On the other hand, it switches to the state which expands and displays the image | video of the camera which reflects the opposite direction.
Note that the rear of the upper swing body refers to the direction opposite to the direction in which the operator normally seated in the driver's seat faces, and the rear end of the upper swing body is, for example, a place where a counterweight or the like is provided Corresponds to this. Further, the opposite side to the operation direction means, for example, the direction opposite to the direction in which the upper swing body is to be moved. For example, when the upper swing body is operated to turn leftward, The right side of the swivel is in the opposite direction.

  Here, when operating the construction machine, it is necessary to perform the operation while visually checking whether there is an obstacle in the work range. For example, when turning the upper-part turning body, the operator needs not only to visually check whether there is an obstacle in the turning range of the front end, but also to check the turning range of the rear end. In particular, in a large hydraulic excavator or the like that turns while the rear part of the upper turning body protrudes from the lower traveling body, it is important to visually recognize the turning range of the rear end.

  Conventionally, as a device for assisting such operator's visual recognition, there has been a rear monitoring device in which one camera is arranged on a counterweight of an upper swing body. According to this rear monitoring apparatus, the camera is turned in the direction in which the counterweight is about to turn to reflect the turning range of the counterweight. However, there is a problem that a time lag occurs until the camera actually reflects the turning range of the counterweight, which is not sufficient in terms of safety.

  Therefore, in the construction machine monitoring apparatus of the present invention, a monitor screen that constantly displays a plurality of cameras for projecting the movable range at the rear end portion of the upper-part turning body and a camera image displayed on each camera on a single screen. And a first control unit that automatically switches and displays a camera image showing a direction opposite to the operation direction of the operation lever when the operator operates the operation lever. Yes.

Thus, without causing a time lag until the movable range at the rear end of the upper swing body is projected, an image of the movable range at the rear end of the upper swing body is displayed almost simultaneously with the start of the upper swing body. Is possible. In addition, since the video in the direction that the operator wants to view is enlarged and displayed, the operator can firmly check whether there is an obstacle in that direction.
As a result, the safety when operating the construction machine can be further improved.

A construction machine monitoring device according to a second invention is the construction machine monitoring device according to the first invention, and the operation lever is a turning operation lever for turning the upper turning body with respect to the lower traveling body.
Here, when the operator operates the turning operation lever, a camera that reflects the opposite side of the operated direction, for example, when the operator operates the turning operation lever so as to turn left, it is arranged on the upper turning body. An image corresponding to a camera that reflects the right side of the upper-part turning body among a plurality of camera images is automatically enlarged and displayed on the monitor screen.
Thereby, when trying to turn the upper turning body, the camera image in the direction desired to be visually recognized is automatically displayed without the operation by the operator, so that the operation burden on the operator can be reduced.

  A construction machine monitoring device according to a third aspect of the present invention is the construction machine monitoring device according to the first or second aspect of the present invention, wherein when the traveling control lever for traveling the lower traveling body back and forth is operated, The camera further includes a second display control unit for enlarging and displaying the video of the camera that reflects the rear.

Here, when the operator operates the travel control lever, the image corresponding to the camera that reflects the rear of the upper swing body is automatically enlarged on the monitor screen from the plurality of camera images arranged on the upper swing body. Displayed.
As a result, for example, when the operator performs a backward operation, a camera image in a direction to be automatically viewed, that is, a camera image behind the upper swing body is automatically displayed without an operation by the operator. It is possible to reduce the operation burden on the operator.

  A construction machine monitoring device according to a fourth invention is the construction machine monitoring device according to any one of the first to third inventions, further comprising a sensing unit and a third display control unit. I have. The sensing unit senses an object that enters the movable range of the upper swing body. When the sensing unit senses an object, the third display control unit enlarges and displays an image of a camera arranged at a position where the object is projected among the plurality of cameras on the monitor screen.

Here, when the sensing unit senses an object that enters the turning range of the upper-part turning body, a camera image arranged at a position that reflects the entering object is enlarged and displayed on the monitor screen.
As a result, even when an event occurs suddenly or an event that the operator does not notice, an image showing the event is automatically enlarged and displayed.
As a result, problems that the operator did not predict can be avoided, and safety when operating the construction machine can be further improved.

  A monitoring device for a construction machine according to a fifth aspect of the present invention includes a lower traveling body and an upper revolving body that is turnably attached to the lower traveling body, and the construction machine that operates the lower traveling body and the upper revolving body with an operation lever. Provided with a camera, a monitor screen, a sensing unit, and a control unit. A plurality of cameras are installed on the upper swing body. The monitor screen displays each image projected by a plurality of cameras on one screen. The sensing unit senses an object that enters the movable range of the upper swing body. When the sensing unit senses an object, the control unit enlarges and displays an image of a camera arranged at a position where the object is projected on the monitor screen.

Here, when the state of the normal monitor screen that displays each image captured by multiple cameras placed behind the upper revolving structure on one screen is detected by the sensing unit, the object is projected. The camera switches to a state where the image of the camera capable of being enlarged is displayed.
The movable range includes a predetermined distance that ensures safety when the lower traveling body moves forward and backward, in addition to the turning range when the upper turning body turns.

  As a result, there is no time lag until the turning range of the rear end of the upper swinging body is displayed, and if there is an object that enters the turning range of the upper swinging body, an image showing that object is displayed immediately. It becomes possible to do. In addition, since the video in the direction to be visually recognized by the operator is enlarged and displayed, the operator can firmly check whether there is an obstacle in that direction.

  As a result, the safety when operating the construction machine can be further improved.

  According to the construction machine monitoring apparatus of the present invention, the safety when operating the construction machine can be further improved.

[First Embodiment]
A hydraulic excavator (construction machine) 1 equipped with a monitoring device according to an embodiment of the present invention will be described as follows with reference to FIGS.
In addition, the words “left”, “right”, “front”, and “rear” used in the following description are directions when the operator normally sits on the driver's seat in the cab 6 (see FIG. 1 and the like). The direction on the basis of.

[Configuration of hydraulic excavator 1 as a whole]
As shown in FIG. 1, a hydraulic excavator 1 according to the present embodiment includes a lower traveling body 2, an upper swing body 3, a work implement 4, a counterweight 5, a cab 6, rear cameras 11a and 11b, And an equipment room 12.
The lower traveling body 2 rotates the crawler belts 2a wound around the left and right ends of the traveling direction to move the excavator 1 forward and backward, and attach the upper revolving body 3 to the upper surface side in a state in which the upper revolving body 3 can pivot. Yes.

The upper swing body 3 can be swung in any direction on the lower traveling body 2, and the work machine 4, the counterweight 5, and the cab 6 are mounted on the upper surface.
The work machine 4 is configured to include a boom 7, an arm 8 attached to the tip of the boom 7, and a bucket 9 attached to the tip of the arm 8. Work on the civil engineering site where excavation of earth and sand, gravel, etc. while moving 9 etc. up and down.

The counterweight 5 is made of, for example, scrap iron or concrete in a box formed by assembling steel plates and hardened. The counterweight 5 is provided at the rear part of the upper swing body 3 to balance the vehicle body during mining. It has been.
The cab 6 is a driver's cab where an operator of the excavator 1 gets on and off, and is disposed on the left front side on the upper swing body 3 on the left side of the work machine 4 so that the tip of the work machine 4 can be seen. Yes.

The rear cameras (cameras) 11a and 11b are a part of the monitoring device 11 for assisting the operator to visually recognize the rear of the upper swing body 3, and the left rear camera 11a reflects the left rear side of the upper swing body 3. The right rear camera 11b projects the right rear side of the upper swing body 3. The monitoring device 11 including the monitor screen 42 will be described in detail later.
The equipment room 12 is arranged behind the work machine 4 and houses an engine, a fuel tank, a hydraulic oil tank, an operation valve, and the like (not shown).

[Configuration of hydraulic and electric circuit 20]
As shown in FIG. 2, the hydraulic excavator 1 of the present embodiment includes a pilot pressure oil pump 21, a travel operation lever 22, pilot pipelines 23 a, 23 b, 28 a, 28 b, direction switching valves 24, 29, An oil pressure and electric circuit 20 configured to include an operation lever 27, a hydraulic pump 31, a traveling hydraulic motor 32, a swing hydraulic motor 33, and pressure switches 35a, 35b, 35c, and 35d is provided.

The pilot pressure oil pump 21 is a pump for supplying pilot pressure oil to the pilot pipe lines 23 a, 23 b, 28 a, 28 b, and is connected to the pilot pipe lines 23 a, 23 b via the travel operation lever 22 and the turning operation lever 27. -It is connected to 28a and 28b.
The traveling operation lever (operation lever) 22 is a lever for operating the traveling operation of the lower traveling body 2, and outputs predetermined pilot pressure oil to the pilot pipe lines 23a and 23b based on the lever operation.

The pilot lines 23a and 23b are pipes for guiding the pressure oil supplied from the pilot pressure oil pump 21 to the direction switching valve 24, and are connected to the pilot pressure oil input ports 24a and 24b.
The direction switching valve 24 performs a predetermined oil path switching operation, flow rate adjustment, and the like based on the pressure oil input to the pilot pressure oil input ports 24a and 24b.

The turning operation lever (operation lever) 27 is a lever for operating the traveling operation of the upper turning body 3 and outputs predetermined pilot pressure oil to the pilot pipe lines 28a and 28b based on the lever operation.
The pilot pipes 28a and 28b are pipes for guiding the pressure oil supplied from the pilot pressure oil pump 21 to the direction switching valve 29, and are connected to the pilot pressure oil input ports 29a and 29b.

The direction switching valve 29 performs a predetermined oil path switching operation, flow rate adjustment, and the like based on the pressure oil input to the pilot pressure oil input ports 29a and 29b.
The hydraulic pump 31 is connected to the traveling hydraulic motor 32 and the turning hydraulic motor 33 via the direction switching valve 24 and the direction switching valve 29, respectively. And the traveling hydraulic motor 32, the turning hydraulic motor 33, etc. are driven by the pressure oil supplied from these pumps.

  The pressure switches 35 a to 35 d are arranged on the flow path of the pressure oil sent out from the pilot pressure oil pump 21, that is, on the pilot pipelines 23 a, 23 b, 28 a, and 28 b, and are supplied from the pilot pressure oil pump 21. The pressure is detected and a detection signal is transmitted to the controller 41. The pump pressure detected here is used as a means for detecting predetermined operation levers (traveling operation lever 22, turning operation lever 27) when performing display switching control of a monitor screen described later.

[Configuration of Monitoring Device 11]
The monitoring device 11 is a device for the operator to visually recognize the rear of the upper swing body 3 through the monitor screen 42 in a state where the operator is seated in the driver's seat. As shown in FIG. 3, the left rear camera 11a and the right rear The camera 11b, a monitor screen 42, and a controller 41 (first display control unit / second display control unit) are configured.

As shown in FIG. 2, the controller 41 constitutes a part of the hydraulic and electric circuit 20 and controls the monitor screen 42 in conjunction with the pressure switches 35 a to 35 d.
As shown in FIG. 4, the left rear camera 11 a is arranged on the left rear side on the upper surface of the counterweight 5 arranged behind the upper swing body 3 and reflects the left rear side of the upper swing body 3. Thereby, when the upper swing body 3 turns right, the left rear turning range of the upper swing body 3 can be constantly projected.

As shown in FIG. 4, the right rear camera 11 b is arranged on the right rear side of the upper surface of the counterweight 5 arranged behind the upper swing body 3 and reflects the right rear side of the upper swing body 3. Thereby, when the upper turning body 3 turns left, the right rear turning range of the upper turning body 3 can be constantly displayed.
The monitor screen 42 is installed in the cab 6 and is arranged in front of the cab 6 so that the operator can see the monitor screen 42 while sitting on the driver's seat. As shown in FIG. 5, the monitor screen 42 displays both a video 43a projected by the left rear camera 11a and a video 43b projected by the right rear camera 11b on one screen of the monitor screen 42 during normal work. The normal operation means a state in which the lower traveling body 2 moves forward and backward and the upper swing body 3 is not turned.

As shown in FIG. 2, the controller 41 constitutes a part of the hydraulic and electric circuit 20, receives the detection signals transmitted from the pressure switches 35a to 35d, and displays the following predetermined screen display. To control.
<Flowchart of Screen Control on Monitor Screen 42>
As shown in FIG. 5, the monitor screen 42 displays both an image 43a projected by the left rear camera 11a and an image 43b projected by the right rear camera 11b on one screen as shown in FIG. In this flowchart (see FIG. 6), the state displayed at the time of the normal work is used as a reference, and this state is described as step S1.

In step S <b> 2, the operator operates the turning operation lever 27. Thereafter, the process moves to step S3 when operated to turn left, and moves to step S8 when operated to turn right.
In step S3, the operator operates the turning operation lever 27 so as to turn the upper turning body 3 to the left, and at this time, the pressure switch 35d disposed on the flow path of the pilot line 28a is operated by the pump pressure. Is detected.

In step S4, the pressure switch 35d transmits a pump pressure detection signal to the controller 41.
In step S5, the controller 41 receives a detection signal from the pressure switch 35d.
In step S6, after determining that the received detection signal is a signal from the pressure switch 35d, the controller 41 enlarges and displays the image 43b of the right rear camera 11b from the state of displaying both images (FIG. 5). Thereby, it becomes possible to visually recognize the range in which the rear of the upper swing body 3 turns, and the direction to be visually recognized by the operator is displayed in an easy-to-see manner, so that safety during operation is improved.

In step S7, the pressure switch 35d confirms again whether the pump pressure can be detected. If the pump pressure can be detected, in order to maintain the state in which the image of the right rear camera 11b is enlarged and displayed as it is. Control goes to step S6.
In step S13, when the pressure switch 35d cannot detect the pump pressure in step S7, the video of the right rear camera 11b displayed on the monitor screen 42 is enlarged and displayed at this time (see FIG. 5). ) To return to the state where both images are displayed.

On the other hand, in step S8, when the operator operates the turning operation lever 27 to turn the upper turning body 3 to the right, at this time, the pressure switch 35c disposed on the flow path of the pilot conduit 28b. Detects the pump pressure.
In step S <b> 9, the pressure switch 35 c transmits a pump pressure detection signal to the controller 41.

In step S10, the controller 41 receives a detection signal from the pressure switch 35c.
In step S11, after determining that the received detection signal is a signal from the pressure switch 35c, the controller 41 enlarges and displays the image 43a of the left rear camera 11a from the state of displaying both images (see FIG. 5). As a result, similarly to step S6, the turning range behind the upper swing body 3 can be visually recognized, and the direction to be visually recognized by the operator is displayed in an easy-to-see manner, improving safety during operation. To do.

In step S12, the pressure switch 35c confirms again whether the pump pressure can be detected. If the pump pressure can be detected, in order to maintain the state in which the image of the left rear camera 11a is enlarged and displayed as it is. Control goes to step S11.
In step S13, the pressure switch 35c cannot detect the pump pressure in step S12. At this time, the image 43a of the left rear camera 11a displayed on the monitor screen 42 is enlarged and displayed. Return to the video display state.

In the monitoring device 11, the display of the monitor screen 42 is switched according to the contents of the turning operation lever 27 operated by the operator by performing the processing according to the procedure described above.
[Features of hydraulic excavator 1]
(1)
In the monitoring device 11 mounted on the hydraulic excavator 1 of this embodiment, a left rear camera 11a that constantly reflects the left rear side of the upper swing body 3, and a right rear camera 11b that reflects the right rear side of the upper swing body 3; , A monitor screen 42 that displays the respective camera images 43a and 43b on one screen, and a camera image that shows a direction opposite to the operation direction of the operation lever when the operator operates the operation lever (turning operation) When the lever 27 is operated to turn left, the image of the camera 11b showing the right rear side of the upper swing body 3, and when the swing operation lever 27 is operated to turn right, the upper swing body 3 is displayed. And a controller 41 for switching so as to enlarge and display the image of the camera 11a that projects the left rear side.

  Thereby, it is possible to display an image of the movable range at the rear end portion of the upper swing body 3 at the same time as the upper swing body 3 starts moving without causing a time lag until the movable range of the upper swing body 3 is projected. It becomes. In addition, since the video in the direction most desired to be visually recognized by the operator is automatically enlarged and displayed, the operator can firmly check whether there is an obstacle in that direction.

As a result, safety when operating the excavator 1 can be further improved.
(2)
In the monitoring device 11 mounted on the hydraulic excavator 1 of the present embodiment, when the operator operates the turning operation lever 27 to turn left, the upper turning body from the camera images 43a and 43b that reflect the rear of the upper turning body 3 is displayed. 3 is automatically enlarged and displayed on the monitor screen 42 (see FIG. 5), and when the turning operation lever 27 is turned to the right, the upper turning body is displayed. 3 is automatically enlarged and displayed on the monitor screen 42 (see FIG. 5). The camera image 43a showing the left rear side of the upper swing body 3 is displayed on the monitor screen 42.

As a result, when the upper swing body 3 is to be turned, the camera image in the direction that the operator most wants to visually recognize is automatically displayed without the operator's operation, thereby reducing the operation burden on the operator. It becomes.
(3)
In the monitoring device 11 mounted on the hydraulic excavator 1 of the present embodiment, the respective camera images 43 a and 43 b are displayed on one screen of the monitor screen 42.

Accordingly, since the camera images can be visually recognized before attempting to move the upper swing body 3, it is possible to further improve the safety immediately after the upper swing body 3 is moved.
[Second Embodiment]
A hydraulic excavator (construction machine) 51 equipped with a monitoring device 52 according to another embodiment of the present invention is provided with a rear camera 11c indicated by a broken line in FIGS. It is added.

Then, as shown in FIG. 4, the rear camera 11 c is disposed at the rear center portion of the upper surface of the counterweight 5 disposed behind the upper swing body 3 and reflects the rear of the upper swing body 3. Thereby, the movable range at the time of the lower traveling body 2 retreating can be constantly projected.
A hydraulic excavator 51 equipped with a monitoring device 52 according to another embodiment of the present invention will be described below with reference to FIGS.

In addition, parts common to the above-described embodiment corresponding to FIGS. 1 to 4, such as an overall configuration of the hydraulic excavator 51 described in the above-described embodiment, a functional block diagram configuring the hydraulic and electrical circuit 20, and the entire monitoring device 52 The details of are omitted here.
<Flowchart of Screen Control on Monitor Screen 42>
As shown in FIG. 7, the monitor screen 42 includes a video 43a projected by the left rear camera 11a, a video 43b projected by the right rear camera 11b, and a video 43c projected by the rear camera 11c on one screen of the monitor screen 42 as shown in FIG. 3 images are displayed. In this flowchart (see FIG. 8), the state displayed at the time of the normal work is used as a reference, and this state is described as step S21.

In step S22, the type of operation lever operated by the operator is determined. If the operation lever operated by the operator is the turning operation lever 27, the process proceeds to step S23. If the operation lever is a travel operation lever, the process proceeds to step S34.
In step S23, the operator operates the turning operation lever 27. Thereafter, the process moves to step S24 when operated to turn left, and moves to step S29 when operated to turn right.

In step S24, the operator operates the turning operation lever 27 so as to turn the upper turning body 3 to the left, and at this time, the pressure switch 35d arranged on the flow path of the pilot pipe line 28a is switched to the pump pressure. Is detected.
In step S25, the pressure switch 35d transmits a pump pressure detection signal to the controller 41.

In step S26, the controller 41 receives a detection signal from the pressure switch 35d.
In step S27, after the controller 41 determines that the received detection signal is a signal from the pressure switch 35d, the state in which the video 43b of the right rear camera 11b is enlarged and displayed from the state in which three images are displayed (FIG. 7). Accordingly, it is possible to visually recognize the range in which the rear of the upper swing body 3 turns, and the method to be visually recognized by the operator is displayed in an easy-to-see manner, so that safety during operation is improved.

In step S28, the pressure switch 35d confirms again whether the pump pressure can be detected. If the pump pressure can be detected, in order to maintain the state in which the image of the right rear camera 11b is enlarged and displayed as it is. Control goes to step S27.
In step S40, in step S28, the pressure switch 35d cannot detect the pump pressure. At this time, the image 43b of the right rear camera 11b displayed on the monitor screen 42 is enlarged and displayed. Return to the video display state.

In step S29, the operator operates the turning operation lever 27 so as to turn the upper turning body 3 to the right. At this time, the pressure switch 35c disposed on the flow path of the pilot line 28b is pumped. Detect pressure.
In step S <b> 30, the pressure switch 35 c transmits a pump pressure detection signal to the controller 41.

In step S31, the controller 41 receives a detection signal from the pressure switch 35c.
In step S32, the controller 41 determines that the received detection signal is a signal from the pressure switch 35c, and then enlarges and displays the video 43a of the left rear camera 11a from the state of displaying three video images (FIG. 7). As a result, as in step S27, it is possible to visually recognize the range in which the rear of the upper-part turning body 3 turns, and the direction to be visually recognized by the operator is displayed in an easy-to-see manner. improves.

In step S33, the pressure switch 35c confirms again whether the pump pressure can be detected. If the pump pressure can be detected, the image of the left rear camera 11a is enlarged and displayed as it is. Control goes to step S32.
In step S40, when the pressure switch 35c cannot detect the pump pressure in step S33, the image of the left rear camera 11a displayed on the monitor screen 42 is enlarged and displayed at this time. Return to the state where is displayed.

In step S34, the operator operates the travel operation lever 22.
In step S35, when the operator operates the travel operation lever 22 so that the lower traveling body 2 travels, at this time, the pressure switches 35c and 35d disposed on the flow paths of the pilot conduits 23a and 23b. Either of these detects the pump pressure.
In step S <b> 36, one of the pressure switches 35 a and 35 b transmits a pump pressure detection signal to the controller 41.

In step S37, the controller 41 receives a detection signal from one of the pressure switches 35a and 35b.
In step S38, after the controller 41 determines that the received detection signal is a signal from one of the pressure switches 35c and 35d, the image 43c of the rear camera 11c is enlarged from the state where three images are displayed. Switch to the display state (see FIG. 7). Thereby, it becomes possible to visually recognize the movable range in which the lower traveling body 2 travels, and the direction to be visually recognized by the operator is displayed in an easy-to-see manner, so that safety during operation is improved.

In step S39, it is checked again whether one of the pressure switches 35a and 35b can detect the pump pressure. If the pump pressure can be detected, the image of the rear camera 11c is enlarged and displayed as it is. To continue to step S38.
In step S40, when one of the pressure switches 35a and 35b cannot detect the pump pressure in step S39, the video of the rear camera 11c displayed on the monitor screen 42 is enlarged and displayed at this time. The state returns to a state in which three images are displayed.

The monitoring device 52 switches the display of the monitor screen 42 according to the contents of the traveling operation lever 22 and the turning operation lever 27 operated by the operator by performing processing according to the procedure described above.
[Features of hydraulic excavator 51]
(1)
In the monitoring device 52 mounted on the hydraulic excavator 51 of the present embodiment, a left rear camera 11a that constantly reflects the left rear side of the upper swing body 3, and a right rear camera 11b that reflects the right rear side of the upper swing body 3; The rear camera 11c that reflects the back of the upper swing body 3, the monitor screen 42 that displays the respective camera images 43a, 43b, and 43c on one screen, and when the operator operates the operation lever, Camera image showing the direction opposite to the operation direction (when the turning operation lever 27 is operated to turn left, the image of the camera 11b showing the right rear side of the upper turning body 3, the turning operation lever 27 to the right A controller 41 that switches to display an enlarged image of the camera 11a that reflects the left rear side of the upper swing body 3 when operated to turn.

  Thus, without causing a time lag until the movable range of the upper swing body 3 is projected, an image of the movable range at the rear end of the upper swing body 3 can be displayed almost simultaneously with the start of the upper swing body 3. It becomes possible. In addition, since the video in the direction desired to be visually recognized by the operator is automatically enlarged and displayed, the operator can securely check whether there is an obstacle in that direction.

As a result, safety when operating the excavator 51 can be further improved.
(2)
In the monitoring device 52 mounted on the hydraulic excavator 51 of the present embodiment, when the operator operates the turning operation lever 27 to turn left, the upper part of the camera images 43a, 43b, and 43c showing the rear of the upper turning body 3 is displayed. The camera image 43b that reflects the right rear side of the revolving structure 3 is automatically enlarged and displayed on the monitor screen 42 (see FIG. 7). When the turning control lever 27 is operated to turn right, the camera image 43a showing the left rear side of the upper turning body 3 is automatically selected from the camera images 43a, 43 and 43cb showing the rear of the upper turning body 3. Thus, the screen is enlarged and displayed on the monitor screen 42 (see FIG. 7). Further, when the traveling operation lever 22 is operated, a camera image 43c that reflects the rear of the upper swing body 3 is automatically expanded on the monitor screen 42 from the camera images 43a, 43b, and 43c that reflect the rear of the upper swing body 3. The displayed state (see FIG. 7) is obtained.

As a result, when moving the upper revolving unit 3, the camera image in the direction desired to be viewed is automatically displayed without the operator's operation, thereby improving the safety while reducing the operator's operation burden. Can be made.
(3)
In the monitoring device 52 mounted on the hydraulic excavator 51 of the present embodiment, the respective camera images 43 a, 43 b, and 43 c are displayed on one screen of the monitor screen 42.

Accordingly, since the camera images can be visually recognized before attempting to move the upper swing body 3, it is possible to improve safety immediately after the upper swing body 3 is moved.
(4)
In the monitoring device 52 mounted on the hydraulic excavator 51 of the present embodiment, a left rear camera 11a that constantly reflects the left rear side of the upper swing body 3, and a right rear camera 11b that reflects the right rear side of the upper swing body 3; A rear camera 11c that reflects the rear of the upper swing body 3 is disposed.

As a result, the number of cameras to be arranged has increased compared to the prior art, so that the range of the field of view that becomes a blind spot can be narrowed, and the safety when operating the excavator 51 can be further improved.
[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention.

(A)
In the hydraulic excavators 1 and 51 of the first and second embodiments described above, when the operator operates the operation lever, a camera image showing the direction opposite to the operation direction of the operation lever (the turning operation lever 27 is turned to the left). When operated to rotate, the image of the camera 11b showing the right rear side of the upper swing body 3, and when operating the swing operation lever 27 to the right, the left rear side of the upper swing body 3 An example of switching to display an enlarged image of the camera 11a that displays the image has been described. However, the present invention is not limited to this.

  For example, as shown in FIG. 9, infrared sensors (sensing units) 60a, 60b, and 60c corresponding to three cameras are provided to detect that an object has entered a predetermined range.・ When 60b and 60c detect an object, project the object from a state in which the images displayed by the plurality of cameras 11a, 11b, and 11c arranged behind the upper swing body are displayed on one screen. There may be provided a controller 41 (control unit) (see FIG. 2) for switching so as to enlarge and display the image of the camera arranged at a position where the image can be displayed. Here, the description of the hydraulic pressure and electric circuit shown in FIG. 2 is omitted. At this time, the number of cameras installed at the rear is not limited to three, and may be two, for example.

  As a result, there is no time lag until the turning range of the rear end of the upper swinging body is displayed, and if there is an object that enters the turning range of the upper swinging body, an image showing that object is displayed immediately. It becomes possible to do. In addition, since an image of a direction to be visually recognized by the operator is enlarged and displayed, the operator can firmly check whether there is an obstacle in the direction.

As a result, safety when operating the excavator can be further improved.
(B)
In the first and second hydraulic excavators 1 and 51, an example in which the operation lever (the traveling operation lever 22 or the turning operation lever 27) by the operator is detected and the state displayed on the monitor screen 42 is switched will be described. explained. However, the present invention is not limited to this.

  For example, as shown in FIG. 9, when infrared sensors 60a, 60b, and 60c that detect an object entering a predetermined range are further provided and the infrared sensors 60a, 60b, and 60c detect the object, they are preferentially used. A controller 41 (third display control unit) (see FIG. 2) that switches to enlarge and display the camera image arranged at the position where the object is projected may be provided. As a result, even when an event occurs suddenly or an event that the operator does not notice, an image showing the event is automatically enlarged and displayed.

As a result, problems that the operator did not predict can be avoided, and safety when operating the hydraulic excavator can be further improved.
In addition, as shown in FIG. 9, the infrared sensor is not only arranged so that the range reflected by the camera and the sensor sensing portion have a one-to-one relationship, but one infrared sensor is arranged in one place. Then, it may be controlled to specify a camera arranged at a position that reflects the range from the position where the infrared sensor senses the object and to enlarge and display the image.

(C)
In the first and second hydraulic excavators 1 and 51, the rear cameras 11a, 11b, and 11c are arranged on the counterweight 5 at the rear of the upper swing body 3 and described. However, the present invention is not limited to this.
You may arrange | position a surveillance camera so that the left rear direction and the right rear direction may each be shown in the position which can show the turning range of an upper turning body, for example, the left-right side surface of an upper turning body. Moreover, you may arrange | position to the side part and lower part of a counterweight.

(D)
In the first hydraulic excavator 1, the monitor screen 42 during normal work has been described with an example in which the camera image 43a of the left rear camera 11a and the camera image 43b of the right rear camera 11b are displayed side by side. However, the present invention is not limited to this.
For example, both videos may be displayed side by side, and all camera images may be displayed on one screen. Further, a small camera image may be displayed at one of the four corners on the monitor screen.

The same applies to the hydraulic excavator 51 of the second embodiment.
(E)
In the hydraulic excavator 1 of the first embodiment described above, when an image in the direction that the operator wants to view is enlarged and displayed, for example, an image of only a specific camera is displayed as in the case of left turn in FIG. Explained with examples. However, the present invention is not limited to this.

For example, referring to FIG. 5, when the image 43b of the right rear camera is enlarged and displayed in a state where both images are displayed, the ratio of the size of the image 43a of the left rear camera and the image 43b of the right rear camera. However, for example, the video in the direction that the operator most wants to visually recognize, such as displaying at 2: 8, may be displayed larger than the video displayed during normal work.
(F)
In the hydraulic excavators 1 and 51 of the first and second embodiments described above, an example in which the operator operates various operation levers in the cab 6 has been described. However, the present invention is not limited to this.

  For example, the present invention can be applied to a hydraulic excavator used in an unmanned construction scene such as a dangerous place. In this case, the operation of various control levers in the cab includes, for example, the operation of a remote controller equipped with a camera image display unit mounted on a construction machine, or the operation equipment in a remote operation room equipped with a monitor. This corresponds to the operation.

  According to the present invention, it is possible to automatically display the direction most desired to be visually recognized by the operator according to the operation content of a predetermined operation lever. Therefore, the present invention can be applied to a monitoring device for a construction machine other than a hydraulic excavator.

1 is an external view of a hydraulic excavator including a monitoring device according to an embodiment of the present invention. FIG. 2 is a hydraulic and electric circuit diagram mounted on the hydraulic excavator in FIG. 1. The block diagram which shows the monitoring apparatus of FIG. 1 is a rear view of a hydraulic excavator including a monitoring device according to an embodiment of the present invention. Explanatory drawing which showed the display content of the monitor screen which concerns on one Embodiment of this invention. The flowchart which shows the display control which concerns on one Embodiment of this invention. Explanatory drawing which showed the display content of the monitor screen which concerns on other embodiment of this invention. The flowchart which shows the display control which concerns on other embodiment of this invention. The rear view of the hydraulic shovel containing the monitoring apparatus which concerns on further another embodiment of this invention.

Explanation of symbols

1 Excavator (construction machine)
2 Lower traveling body 2a Crawler track 3 Upper revolving body 4 Working machine 5 Counterweight 6 Cab 7 Boom 8 Arm 9 Bucket 10 Hydraulic cylinder 11 Monitoring device 11a Left rear camera (camera)
11b Right rear camera (camera)
11c Rear camera (camera)
12 Equipment Room 20 Hydraulic and Electric Circuit 21 Pilot Pressure Oil Pump 22 Traveling Operation Lever (Operation Lever)
23a / 23b Pilot pipeline 24 Direction switching valve 24a / 24b Pilot pressure oil input port 27 Rotation operation lever (operation lever)
28a and 28b Pilot pipe lines 29a and 29b Pilot pressure oil input port 31 Hydraulic pump 32 Traveling hydraulic motor 33 Swing hydraulic motors 35a to 35d Pressure switch 41 Controller (first to third display control units and control units)
42 Monitor screen 43a Camera image 43b Camera image 51 Hydraulic excavator (construction machine)
52 Monitoring devices 60a-60d Infrared sensor (sensing unit)

Claims (5)

A monitoring device attached to a construction machine that includes a lower traveling body and an upper revolving body that is mounted on the lower traveling body in a swingable state, and that operates the lower traveling body and the upper revolving body with an operation lever. And
A plurality of cameras installed in the upper swing body;
A monitor screen for displaying each image projected by the plurality of cameras on one screen;
A first display control unit that magnifies and displays an image of the camera disposed at a position that reflects a direction opposite to the operation direction of the operation lever when the operation lever is operated;
Monitoring equipment for construction machinery with. The operation lever is a turning operation lever for turning the upper turning body with respect to the lower traveling body,
The construction machine monitoring device according to claim 1. A second display control unit that enlarges and displays an image of a camera that reflects the rear of the upper swing body when the travel operation lever that causes the lower travel body to travel back and forth is further provided;
The construction machine monitoring device according to claim 1 or 2. A sensing unit for sensing an object entering the movable range of the upper swing body;
A third display control unit for enlarging and displaying on the monitor screen an image of the camera arranged at a position where the object is projected among the plurality of cameras when the sensing unit senses the object; Have
The monitoring device for a construction machine according to any one of claims 1 to 3. A monitoring device disposed on a construction machine that includes a lower traveling body and an upper swinging body that is turnably attached to the lower traveling body, and that operates the lower traveling body and the upper swinging body with an operation lever;
A plurality of cameras installed in the upper swing body;
A monitor screen for displaying each image projected by the plurality of cameras on one screen;
A sensing unit for sensing an object entering the movable range of the upper swing body;
When the sensing unit senses the object, a control unit that enlarges and displays an image of the camera arranged at a position where the object is projected, on the monitor screen;
Monitoring equipment for construction machinery with.

Images