JPH0512875Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] The invention is based on a self-propelled universal excavator with clam shell,
This relates to safety measures when installing a front attachment such as a crane and performing work such as excavation and lifting.

[Conventional technology]

For example, when excavating the ground by attaching a clam shell to a self-propelled universal excavator,
When the excavation depth reaches about the third floor, the excavation surface is no longer visible to the Clam Ciel operator, making it difficult for the operator to ensure safety through visual inspection.

For this reason, a warning device such as a buzzer or a flashing light is installed near the work area of the clam shell, and a switch for the alarm is installed in the cockpit of the universal excavator. The operator operates the switch,
It was configured to issue an alarm to workers who are in the position where the clam shell is to be worked on, and to inform them of the vicinity of the clam shell.

[Problem that the invention attempts to solve]

However, in the above conventional example, before the operator turns the clam shell to the work target position, the operator operates the switch to activate the alarm, and after turning the clam shell, lowers the clam shell to excavate the ground, and then presses the clam shell again. When the Clam Ciel is raised and swiveled out of the work target position, cumbersome operations such as turning off the switch and turning off the alarm are required, so Clam Ciel operators are often careful when operating the switch. There were times when I made a mistake while driving Clam Ciel.

For this reason, at many construction sites, during the excavation work, a supervisor is placed in front of the self-propelled universal excavator and in a position where he can see the clam shell and the work area to be worked with. I am trying to send a signal to the operators of bulldozers etc. in the area to inform them of the vicinity of Clamciel.

However, in the case of this conventional example, not only is a worker (supervisor) required to ensure safety, but also, depending on the excavated soil, stones caught between clam shells may be used, especially in work sites where there are many boulders. could spill out of the clamshell and injure the guard, creating a new safety problem.

An object of the present invention is to solve the problems of the conventional example described above.

[Means for solving problems]

In this invention, a self-propelled universal excavator is equipped with a counterweight (balance weight) on the opposite side of the front attachment such as a clamshell or crane, and this counterweight is always attached to the front attachment. It is a part that rotates integrally with the excavator, and it is a part that protrudes from the crawler traveling device.We focused on the fact that the area around its turning trajectory is a space that workers cannot enter, and we designed it as a universal excavator. The above objectives were achieved by utilizing these unique features.

That is, the feature of the automatic approach alarm system for the front attachment of a universal excavator according to the present invention is that a non-contact sensor that detects the turning movement of the counterweight of a self-propelled universal excavator is attached to a portable stand. The non-contact sensor is connected to an alarm that can be installed near the position to be worked by the front attachment of the universal excavator, and is configured to issue an alarm based on the detection result of the non-contact sensor. There is a particular thing.

[Effect]

According to the above configuration, when a front attachment such as a clamshell or crane is attached to the universal excavator to perform excavation, lifting, and other operations, a portable stand is placed at an appropriate position on the platform or slab onto which the universal excavator is driven, and when the front attachment is rotated to a specific position, the counterweight is configured to come within the detection field of the non-contact sensor. Meanwhile, by installing an alarm near the position to be worked on by the front attachment, the non-contact sensor will detect when the front attachment approaches the position to be worked on and will automatically activate the alarm to sound an alarm.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a side view showing how the automatic approach warning device of a front attachment of a universal excavator is used, FIG. 2 is a plan view, and FIG. 3 is a perspective view of the main parts.

In the figure, 1 is a self-propelled universal excavator equipped with a crawler traveling device, and 2 is a clamshell, which is an example of its front attachment. Reference numeral 3 indicates a gantry (or slab) on which the universal excavator 1 is mounted, 4 a bulldozer that collects earth and sand at a location to be excavated by the clamshell 2, and 5 a dump truck that carries out the excavated earth and sand by the clamshell 2.

The automatic approach warning device is constructed as follows.

That is, as shown in FIG. 3, an infrared emitter 7a and an infrared receiver 7b are mounted on a steel portable stand 6, which are vertically opposed to each other with the rotation locus of the counterweight W of the universal excavator 1 interposed therebetween. A bell, buzzer, or flare that can be installed in the vicinity of the position where the clam shell 2 is to be excavated (for example, a support of the gantry 3, etc.) constitutes a non-contact sensor S that detects the turning movement of the counterweight W. An alarm device 8 such as a flashing light or a flashing light (preferably an alarm configured to issue both an audible and light alarm by using a combination of a bell and a flashing light, etc.) is provided, and a non-contact sensor S and an alarm are provided. The alarm device 8 is connected to the alarm device 8 by electrical wiring having a relay, and the alarm device 8 is configured to issue an alarm based on the detection result of the non-contact sensor S.

In FIG. 3, 9 is a power box with a built-in power switch and relay, 10 is a cab tire cable that transmits the detection signal, 11 is a connection line to an external 100 volt AC power source, and 12 is a connection line to the alarm 8. It is a connecting line. Reference numeral 13 denotes a tightening screw rotation operating tool, which is configured so that by loosening the tightening screw with this rotating operating tool 13, the distance between the light projector 7a and the light receiver 7b can be adjusted.

According to the above configuration, as shown in FIGS. 1 and 2, the portable stand 6 is installed at an appropriate position on the gantry (or slab) 3 on which the universal excavator 1 is mounted, and the clam shell 2 is identified. The counterweight W is configured so that it enters the detection field of the non-contact sensor S when the counterweight W is turned to the position where the excavation work is to be performed, while the alarm device 8 is installed on the support of the gantry 3, etc. Excavation work using Clam Ciel 2 will begin.

When the clamshell 2 is loading excavated earth and sand into the dump truck 5, the counterweight W is outside the detection field of the non-contact sensor S and does not block the infrared rays emitted from the floodlight 7a, so the alarm 8 does not operate. . Therefore, the operator of the bulldozer 4 can drive the bulldozer 4 to the location where the clam shell 2 is to perform the excavation work.

When the clam shell 2 turns at a predetermined angle toward the position to be excavated, the counterweight W enters the detection field of the non-contact sensor S, and the floodlight 7a,
Since the infrared rays between the light receivers 7b are cut off, the relay operates and the alarm 8 issues an alarm. This results in
Bulldozer 4's operator is Clam Ciel 2.
Knowing that the bulldozer 4 is approaching, the bulldozer 4 can be moved to a safe position.

In the above embodiment, the clam shell 2 is used as an example of the front attachment, but the same can be applied to a case where a crane is attached to the universal excavator 1 and lifting work is performed. Furthermore, in the above embodiment, a non-contact sensor S consisting of an infrared emitter 7a and an infrared receiver 7b was used in order to avoid malfunctions caused by external light. If a pyroelectric detector is used in which electrodes are arranged and wired so that their spontaneous polarization characteristics are in opposite directions, the counterweight W itself becomes an infrared light source, making the portable stand 6 compact and lightweight. It is possible to

[Effect of idea]

The present invention has the above-mentioned configuration, and a non-contact sensor detects when the front attachment of the universal excavator approaches the work target position, and automatically activates the alarm to issue an alarm. , the operator of the universal excavator can concentrate on operation, and there is no need for a full-time supervisor, which not only saves costs, but also eliminates the possibility of accidents involving the supervisor, ensuring safety. It is.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention,
Figure 1 is a side view showing how the automatic approach warning device of the front attachment of a universal excavator is used;
The figure is a plan view, and FIG. 3 is a perspective view of essential parts. 1... Universal excavator, 2... Front attachment (clam shell), 6... Portable stand,
8... Alarm, S... Non-contact sensor, W...
counter weight.

Claims (1)

[Claim for Utility Model Registration] A non-contact sensor for detecting the turning movement of the counterweight of the self-propelled universal excavator is attached to the portable stand, and this non-contact sensor includes a front attachment of the universal excavator. A front attachment for a universal excavator, characterized in that it is configured to connect an alarm that can be installed near the location to be worked by the excavator and issue an alarm based on the detection result of the non-contact sensor. ment approach automatic warning device. The utility model according to claim 1, wherein the non-contact sensor is constituted by a light projector and a light receiver that are vertically opposed to each other with the rotation locus of the counterweight interposed therebetween. Automatic approach warning device for the front attachment of a universal excavator.