JPS6136609Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a light receiver that is attached to a working machine of a construction machine such as a bulldozer and which receives light from a leveling light source such as a laser beam generator. It is related to the device.

Conventionally, in order to excavate the ground at a constant height while maintaining the work equipment at a predetermined height relative to the machine body, a laser beam generator is installed in the ground, and the work equipment is equipped with a light receiver that receives the laser beam. 2. Description of the Related Art A work machine automatic leveling device is known in which the height of the work machine can be detected by providing a height of the work machine, and the work machine is moved up and down according to the detected height.

In this case, however, in order to be able to maintain the working machine at different height positions, it is necessary to move the light receiver up and down relative to the working machine.

Therefore, as shown in Fig. 1, for example, a light receiver d is provided on the piston rod c of a cylinder b installed upright in a working machine a, and pressure oil from a pump e is supplied to the cylinder b via a valve f to cause it to expand and contract. A photoreceiver lifting device has been proposed.

However, with this structure, when the piston rod c is extended, the piston rod c is supported only by the cylinder part, so it is easily affected by vibrations, causing the receiver a to swing, which is undesirable. When the light receiver d is not used, such as when not performing leveling work, there is a risk that foreign matter such as earth and sand may hit the light receiver d and damage the glass d' and the like.

The present invention has been developed in view of the above circumstances, and its purpose is to provide a lifting device for a light receiver that can prevent the light receiver from swinging and also prevent the light receiver from being damaged.

Embodiments of the present invention will be described below with reference to FIG. 2 and subsequent figures.

FIG. 2 is a front view of a bulldozer, which is a construction machine.A blade 2, which is a working machine, is attached to the machine body 1 so as to be able to swing up and down with a cylinder 3.A light receiver 8 is attached to the blade 2 via a lifting device 4. It is installed so that it can be raised and lowered.

That is, as shown in FIG. 3, a cylinder 6 is provided on the blade 2 via a bracket 5, and a light receiver 8 is provided on the piston rod 7 of this cylinder 6.
The cylinder 6 is provided with a cylindrical housing 9.

The housing 9 has a container 11 that is open at the top and can accommodate the light receiver 8 at the upper end of the cylindrical body 10, and a drain hole 1 is provided in the bottom 11a of the container 11.
2, the cylinder 10 is provided with a bearing 13 for supporting the piston rod 7, and a plate 15 having a bearing 14 for supporting the piston rod 7 is fitted into the container 11 so as to be vertically movable. It is pushed up and held by a spring 16 until it comes into contact with a retaining piece 17.

The light receiver 8 has a structure in which a glass plate 8c is provided in a window 8b of a main body 8a, and is smaller in size and shape than the container 11 so as to be housed in the container 11, and is designed to generate a laser beam (not shown). In addition to being able to receive laser light from the source,
The opening 11b of the container 11 is located in the upper part of the main body 8a.
A cover plate (hood) 18 is provided to close the opening end surface 11c of the container 11 on the lower surface of the outer peripheral edge of the cover plate 18.
An annular packing 19 is provided which comes into contact with the.

Therefore, when the piston rod 7 is extended as shown in FIG. 3, the upper and lower portions of the piston rod 7 are
Since the parts are supported, the light receiver 8 does not swing even if vibrations or the like occur, and the laser beam can always be reliably received.

Further, the light receiver 8 that retracts the piston rod 7 comes into contact with the plate 15 and enters the container 11 while compressing the spring 16, and finally, as shown in FIG.
The light receiver 8 is housed in the container 11, and the cover plate 18 closes the opening 11b of the container 11, so that the light receiver 8 can be protected and enclosed by the container 11 and the cover plate 18.

Therefore, when the light receiver 8 is not in use, such as when the bulldozer is not in use or when leveling work is not performed, foreign objects such as rocks and earth do not collide with the light receiver 8, and damage to the light receiver 8 can be prevented.

Note that the rod corresponding to the piston rod 7 may be moved up and down by other means, such as a rack and pinion, instead of the cylinder 6.

The present invention is as described above, and since the rod 7 equipped with the light receiver 8 is supported at two places above and below the container 11, it is difficult to swing, and the light receiver 8 can be prevented from swinging. Since the photodetector 8 is housed in the container 11 and can be covered with a cover plate 18, the photodetector 8 will not be hit by earth, sand, rocks, etc. when it is not in use, and damage can be prevented.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional example, FIG. 2 is an overall diagram showing an embodiment of the present invention, FIG. 3 is a sectional view of a main part, and FIG. 4 is an explanatory diagram of operation. 6 is a rod, 8 is a light receiver, 11 is a container, and 18 is a cover plate.

Claims (1)

[Scope of utility model registration request] A cylindrical container 11 with an open top is attached to the working machine, and a rod 7 is provided vertically movably through the container 11, and a light-receiving device having a smaller size and shape than the container 11 is mounted on the upper part of the rod 7. A device for lifting and lowering a light receiver, characterized in that a container 8 is provided, and a cover plate 18 for closing the opening of the container 11 is provided above the light receiver 8.