JPH08158407A - Mobile type construction machine - Google Patents

Abstract

PURPOSE: To provide a mobile type construction machine,equipped with a TV camera for monitoring the rear view, with which the TV camera installing structure is free from a risk of camera breakage during works and in transit and is favorable for the installing space. CONSTITUTION: A hole 22b is provided in a counter-weight 22, and a TV camera 35 to photograph the back scene of the body 1 is accommodated in this hole 22b. A TV receiver 36 to display the image photographed by the camera 35 is installed in the cab 1f.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile construction machine such as a hydraulic excavator or other excavator or a crane having a counterweight mounted on a rear portion of a main body thereof, and more particularly to a television camera installation structure for rearward confirmation.

[0002]

2. Description of the Related Art As shown in a plan view of FIG. 7A and a side view of FIG. 7B, a construction machine such as a hydraulic excavator or a crane is generally mounted on a lower traveling body 1a via a turning device 1b. The upper swing body 1c is installed to configure the main body 1, and a counterweight 22 is mounted on the rear portion of the upper swing body 1c to balance the weight. Since the hydraulic excavator of this example shows a loading shovel, the multi-joint arm 1d having the loading bucket 1e is attached to the upper revolving structure 1c, but there is also a backhoe bucket and its multi-joint arm attached. This excavator is
In addition to the hydraulic pump 2b driven by the engine 3, the hydraulic pump 2a driven by the electric motor 4 is provided on the upper swing body 1c so that the tunnel construction, the underground construction or the construction in the factory that dislikes engine exhaust can be driven by the electric motor.
It is equipped with. This hydraulic excavator operates the hydraulic pump 2b by the engine 3 outdoors or in a place where there is no power supply. On the other hand, the work at a work site where no exhaust gas is required such as in the tunnel construction or a work site with a power supply is operated by an electric motor. The hydraulic pump 2a is operated by 4 to perform the work. Incidentally, 6a is an oil cooler for the hydraulic pump 2a, 5a is its fan, 6b is a radiator for the engine 3 and an oil cooler for the hydraulic pump 2b, and 5b is its fan.

Tunnel construction, which is a particularly narrow construction site,
When moving backwards, it is necessary to check backwards when moving underground, so a table 32 should be placed on the counterweight 22.
The TV camera 35 is installed via the
There is one in which an image photographed by No. 5 is displayed on a television receiver 36 installed in the driver's cab 1f.

[0004]

However, in FIG. 7 (A),
As shown in (B), in the case where the TV camera 35 is mounted on the counterweight 22, falling objects such as stones may collide with the TV camera 35 and damage the TV camera 35 during tunnel construction or the like. Yes, again
There is a problem that the TV camera 35 may collide with something during transportation and damage the TV camera 35, and further, a space for installing the TV camera 22 is required.

In view of the above-mentioned problems, the present invention is advantageous in terms of installation space in a mobile construction machine having a television camera for rearward confirmation without fear of damage to the television camera during work or transportation. It is an object of the present invention to provide a television camera having a structure for installing the same.

[0006]

In order to achieve the above object, the present invention has a counterweight mounted on a rear portion of a main body,
In a construction machine in which a driver's cab is installed in the front of the main body, a hole is formed in the counterweight, a television camera for capturing a scene behind the upper swing body is housed in the hole, and an image captured by the television camera in the driver's cab It is characterized by installing a television receiver that displays.

[0007]

In the present invention, since the television camera is housed in the hole provided in the counterweight, the television camera is prevented from being damaged by a collision by a falling object or the like or a collision during transportation.

[0008]

1 is a left side view showing an embodiment of a construction machine according to the present invention in a working state of a hydraulic excavator, FIG. 2 is a plan view, and FIG. 3 is a right side view. Reference numeral 2 is a hydraulic pump mounted on the upper swing body 1c of the hydraulic excavator, and 3 and 4 are an engine and an electric motor provided as drive sources for the hydraulic pump 2.
As shown in FIGS. 2 and 3, the engine 3 is installed vertically on the rear side of the cab 1f on the opposite side (right side), and the engine 3, the electric motor 4 in front of the engine 3, and the electric motor 4 in front of the electric motor 4 are installed. The hydraulic pump 2 is installed coaxially, and the rotary shaft 7 of the engine 3 and the rotary shaft 8 of the electric motor 4 are double-coupling 20 (a coupling in which elastic bodies for absorbing strain of the rotary shaft are arranged at both ends of the spline). And the clutch 9 and the electric motor 4
The rotary shaft 8 is directly connected to the input shaft 11 of the hydraulic pump 2 via the coupling 10.

Reference numeral 6c denotes a radiator for the engine 3, 6d denotes an oil cooler of a hydraulic system including the hydraulic pump 2,
Is a fan independent of these and also serving as a radiator 6c and an oil cooler 6d for sending cooling air to them, and 5c is a driving hydraulic motor thereof. The engine 3, the electric motor 4, the hydraulic pump 2, the radiator 6c and the oil cooler 6d are covered with a cover 23.

Reference numeral 22 denotes a bolt 21 at the rear of the upper swing body 1c.
As shown in FIGS. 1 to 3, the counterweight 22 and the upper swing body 1c are counterweights that are fixedly mounted on the outer surface of the counterweight 22 (see the rear view of FIG. 4). Is formed in an arc shape centering on the center of the lower traveling body 1a so as not to project from the rear end of the lower traveling body 1a. In order to realize such a structure, the upper revolving structure 1c is made shorter than the conventional one so that the rear end does not protrude from the lower traveling structure 1a, and the counterweight 22 is set to have a high height to reduce the weight. Secure. That is, as shown in FIG. 3, the counterweight 22 (h2) has a half of the height (h1) of the cab 1f.
It is set from the above (preferably 3/4 or more) to the same height as the cab 1f (that is, 1 ≧ h2 / h1 ≧ 1/2, preferably 1 ≧ h2 / h1 ≧ 3/4). Further, since the distance between the mounting position of the counterweight 22 and the turning center O1 becomes short, the weight of the counterweight 22 is made heavier than in the conventional case so as to correspond to it.

Further, in the present embodiment, the structure in which the counterweight 22 does not project from the rear end of the lower traveling body 1a does not forcefully shorten the length of the engine 3, the electric motor 4 or the hydraulic pump 2, and Further, in order to realize the hydraulic pump 2 without increasing the forward projection width, the fan 5 is mounted on the counterweight 22 fixed to the rear portion of the upper revolving structure 1c by the bolt 21 (see the rear view of FIG. 4). ) Inside the cavity 22a. Hydraulic motor 5
The hydraulic hose for supplying hydraulic oil to c is attached to and detached from the hydraulic hose connected to the upper revolving structure 1c through a joint, and is transported with the fan 5 and the hydraulic motor 5c housed in the counterweight 22 during transportation. To do.

In this way, the fan 5 is independent of the radiator 6c and the oil cooler 6d and used also as the radiator 6c and the oil cooler 6d, so that the number of devices can be reduced, and the economy and space saving can be achieved. In addition, since the fan 5 is housed in the counterweight 22, the fan 5 is installed in the counterweight 2
Protected by 2, the counterweight 22 can serve not only to add weight but also to protect the fan 5.

Further, as shown in FIGS. 1 and 2, a frame 4 is provided behind (on the left side of) the operator's cab 1f of the upper swing body 1c.
By 0, the equipment accommodating portion having a height close to or equal to the height of the operator cab 1f is configured in two stages, and the switchboard 41 is provided in the lower stage.
And a battery 42 and a charger 43 thereof are formed, and the working oil tank 33 and the fuel tank 34 are mounted on the upper stage. By providing a device housing portion in such a two-stage stance and mounting each device, the upper swing body 1
The dead space on c can be effectively used, and the upper revolving structure 1c
The upper arrangement is made compact, and as described above, the structure in which the counterweight 22 and the upper swing body 1c do not project from the rear end of the lower traveling body 1a can be easily realized.

In the hydraulic excavator constructed as described above, the rear view of FIG. 4, the side sectional view of FIG.
As shown in the enlarged rear view of (B), the counterweight 2
2 is provided with a hole 22b, and the television camera 35 is provided in the hole 22b.
To house. In this embodiment, the television camera 3
5 is housed via a cushion material 52 in a case 51 in which a transparent plate 50 such as glass is arranged at a portion facing the front surface of the television camera 35, and a bracket 53 provided on the bottom surface on one end side of the case is provided with a hole. A bracket 54 welded to the bottom surface of 22b is vertically swingably attached by a pin 55, and a bracket 56 having a long hole 56a is welded to the other end of the case 51, that is, both sides on the transparent plate 50 side, to form a hole 22b. The television camera 35 is screwed into the bracket 57 with a threaded hole welded to the bottom surface by tightening the bolt 58 passed through the elongated hole 56a to tighten the bolt 58.
It is structured to be fixed and accommodated in b. It is preferable to use the TV camera 35 whose magnification is changed by remote control.

Since the television camera 35 is housed in the hole 22b formed in the counterweight 22 as described above, the television camera 35 is prevented from being damaged by a collision by a falling object or the like or a collision during transportation. It Further, since the TV camera 35 is housed in the counterweight 22, a space for installing the TV camera is not required. Further, when the height of the counterweight 22 is increased as in the present embodiment, it is difficult to confirm the rear,
By providing the counterweight 22 with the hole 22b and accommodating the television camera 35 therein, a structure for raising the counterweight 22 can be realized without any obstacle.

In this embodiment, the upper swing body 1
In order to prevent the side-mounted object of c from colliding with the tunnel wall surface or the dump truck, as shown in FIGS. 1 and 3,
The cover of the hydraulic oil tank 33 and the fuel tank 34 mounted on the left side of the upper swing body 1c, that is, the upper swing body 1c so that the left wall surface of the tunnel can be seen by being reflected by the rearview mirror 31 installed in front of the cab 1f. The vehicle width light 37 is attached to the left side surface of the vehicle, and as shown in FIG. 3, the vehicle width light 38 is attached to the rear side surface of the right side cover 23, that is, the right side surface of the upper swing body 1c. Rearview mirror 3 for viewing the light 38 or the right wall of the tunnel
9 is attached to the stepped portion of the cover 23 so that it can be seen from the operator's cab.

In addition, the height of the electric motor 4 is the same as in the present embodiment.
Since the engine 3 which is larger than the hydraulic pump 2 and the hydraulic pump 2 is located rearward, the height of the cover 23 can be lowered laterally of the cab 1f, as can be seen from FIG.
This improves the lateral field of view. Further, since the engine 3 having a larger weight than the electric motor 4 and the hydraulic pump 2 is located rearward, the weight balance is improved, and the weight of the counterweight 22 can be reduced.

Further, in FIGS. 1 to 3, reference numeral 44 is a cable reel around which a cable 45 for supplying electric power to the electric motor 4 is wound, and 47 is a guide arm through which the cable 45 is passed so as to separate the cable wound around the cable reel 44. , 46 are provided at the base end of the arm 47 and maintain the arm 47 in a fixed direction regardless of the swing of the upper swing body 1c (the swing center O2 is the main body 1).
(In the vicinity of the turning center O1), 48 and 49 are cable sliding means composed of sheaves and rollers provided at both ends of the guide arm 47.

As a method of supporting the cable 45, there are methods shown in FIGS. 6 (A) and 6 (B).
In this method, a power supply 80 is installed at or near the entrance of the tunnel 60, and a relay 82 connected to the power supply 80 via a cable 81 is provided above the tunnel 60, and a cable reel mounted on the hydraulic excavator A. In this method, the cable 45 wound around the cable 44 is connected to the relay 82. In the case of this system, a constant tension is applied to the cable 45 by a torque motor or the like, which is provided on the cable reel 44, and the cable 45 is pulled out as the excavation work by the hydraulic excavator A progresses. Compared with the method in which the cable is laid on the ground by performing the work with the cable 45 floating in the air, the excavation of the hydraulic excavator A and the earth removal work are not hindered, and The cable 45 does not interfere with the dump truck and other construction machines. Further, since the cable 45 does not crawl on the ground, the influence of earth and sand and water is small, and the number of accidents due to electric leakage is reduced.

The system shown in FIG. 6B is a system in which a relay tool 82 is attached to the side wall of the tunnel 60 and the cable 45 is connected to the relay tool 82. In this case, the torque motor is not operated during the excavation work. Even if the upper swing body 1c swings, a tension is set so that the arm 47 always faces the tunnel entrance side without applying a large hydraulic pressure for floating the cable 45 shown in FIG. The hydraulic pressure is raised to a tension that allows the cable 45 to be wound up by the cable reel 44.

INDUSTRIAL APPLICABILITY The present invention can be applied to construction machines such as other excavators using excavators and other excavators other than hydraulic excavators or cargo handling machines such as cranes, and also to non-swinging construction machines.

[0022]

According to the first aspect of the present invention, in a construction machine having a television camera for rearward confirmation, since the television camera is accommodated in the hole provided in the counterweight, falling objects such as earth and sand collide during the work. Therefore, there is no risk that the TV camera will be damaged, or that the TV camera will be damaged during transportation due to collision with other objects. Further, this facilitates handling during work and transportation. Further, a space for installing the television camera on the counterweight is not required, which is advantageous in terms of space.

According to the second aspect of the present invention, also in the construction machine in which the counterweight is increased and the width of the rearward projection is reduced so that the construction machine can be operated in a narrow work site.
The TV camera can be installed without any trouble, and the configuration with a high counter weight can be easily realized.

[Brief description of drawings]

FIG. 1 is a left side view showing a hydraulic excavator, which is an embodiment of a construction machine of the present invention, in a working state in a tunnel.

FIG. 2 is a plan view of the hydraulic excavator of the embodiment.

FIG. 3 is a right side view showing the hydraulic excavator of the embodiment.

FIG. 4 is a rear view of the counterweight according to the embodiment.

5A is a side sectional view showing a mounting structure of a television camera according to the present embodiment, and FIG. 5B is a rear view thereof.

6 (A) and 6 (B) are side views showing a power supply system when work is performed in a tunnel by the hydraulic excavator of this embodiment.

FIG. 7A is a plan view of a conventional hydraulic excavator, and FIG.
Is a side view thereof.

[Explanation of symbols]

1: Main body, 1a: Lower traveling body, 1b: Turning device, 1c:
Upper revolving structure, 22: counterweight, 35: TV camera, 36: TV receiver, 50: transparent plate, 51: case

Claims (2)

[Claims] 1. A construction machine in which a counterweight is mounted on a rear part of a main body, and a driver's cab is installed on a front part of the main body. A hole is formed in the counterweight, and a television camera for capturing a scene behind the main body is housed in the hole. A mobile construction machine is characterized in that a television receiver for displaying an image picked up by the television camera is installed in a driver's cab. 2. The height of the counterweight according to claim 1, which is one of the heights of the operator's cab.
A mobile construction machine characterized by being set in the range from / 2 to the same height as the cab.