JPH0781921B2 - Construction machine with load measurement sensor and excavation load measurement sensor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a construction machine equipped with a load measuring sensor and an excavating load measuring sensor, for example, a hydraulic excavating machine or an excavating type construction such as a wheel type or crawler type excavator machine. The present invention relates to a load measuring sensor suitable for measuring the excavating force of the machine and a construction machine equipped with the excavating load measuring sensor.

[Prior Art] Conventionally known as this type of stress measurement sensor is
There is a strain gauge that uses a wheelstone bridge.
This is to measure the stress applied to the member to be measured and applied to the member.

[Problems to be Solved by the Invention] The conventional strain gauge has various advantages when used for occasional measurement such as a test. However, for example,
When it is attached to a strength member such as a hydraulic excavating machine, a wheel excavator machine, a crawler excavator machine, or other excavating construction machine, it has a drawback that it is immediately peeled off due to vibration or dirt. Therefore, it is not possible to permanently attach such a strain gauge as a sensor for measuring the excavation load of an excavation-type construction machine to the work machine component surface where the excavation force is most prominent. That is, there is no known construction machine equipped with an excavation load measuring sensor.

An object of the present invention is to provide a load measurement sensor that can be permanently installed and a construction machine with an excavation load measurement sensor in such an excavation-type construction machine, focusing on the above conventional problems.

[Means for Solving the Problem] In order to achieve the above object, the load measuring sensor according to claim 1 will be described with reference to FIG. Four penetration items provided 2
And the exciting coil wound through the two through holes 2.
3a and a detection coil 3b wound through the other two through holes 2 so as to intersect with the exciting coil 3a, the load applied to the member 1 is measured. Further, the construction machine with an excavation load measuring sensor according to claim 2 is mounted on a strength member of the excavation work machine in the construction machine provided with the excavation work machine as shown in FIGS. 3 and 4. 1, the load measurement sensor, the exciting coil power supply 7,
The detection processing device 8 is provided.

[Operation] With the load measuring sensor having the configuration according to claim 1,
As shown in FIG. 2, for example, when the load F is applied to the strength member made of a ferromagnetic material, the easy axis 4a of the strength member 1 changes according to the magnitude of the load F, as shown in FIG. Magnetostrictive phenomenon appears). Therefore, leakage flux is generated in the magnetic flux in the strength member caused by the exciting coil 3a,
Since the leak magnetic flux is detected by the detection coil 3b, the magnitude of the load F can be detected. Moreover, since the exciting coil 3a and the detecting coil 3b are wound around the four through holes 2 provided on the surface of the strength member so as to intersect with each other, they are not peeled off, and are free from vibration, dirt and the like like an excavating construction machine. Even in many machines, it can be used as a load measurement sensor for permanent excavation load measurement. Therefore, claim 2
A construction machine with an excavation load measurement sensor having the configuration described above is mounted on a strength member where excavation force is most prominent, such as a work machine of the construction machine (of course, the strength member of the construction machine is made of a ferromagnetic material). Which is an iron material), a power source 7 for exciting the exciting coil, and a processing device 8 for outputting from the detecting coil.
It was decided to measure the excavating load applied to the excavating work machine with the configuration including.

[Examples] Examples will be described below. The first embodiment of the load measuring sensor according to claim 1 is, as shown in FIG. 3, a load measuring sensor provided on the surface-measuring member 1 of the boom 5a and the arm 5b of the hydraulic excavating machine.
6a and 6b. As shown in FIG. 1, each of these has one through hole 2 at each of the four corners of a regular quadrangle on the member surface 1, and two exciting holes 3a are provided at each two through holes on the diagonal line. The detection coil 3b is wound around, that is, the excitation coil 3a and the detection coil 3b are orthogonal (ψ = 90 °). Further, the extension line of the detection coil 3b is configured so as to be orthogonal to the end side 1a of the side surface member 1 (θ = 90 °). Another embodiment is the same as the above-mentioned first embodiment.
The crossing angle ψ of the coil of the book and the crossing angle θ of the member and the coil may be variously changed. Next, claim 2
In the first embodiment of the construction machine with the excavation load measurement sensor of the present invention, referring also to FIG. 3, the excavation load measurement sensor 6a provided on the side member 1 of the boom 5a of the hydraulic excavator, the excitation coil power supply 7, and , And the detection processing device 8. As another embodiment, referring also to FIG. 3, the boom 5a
The excavation load measuring sensor 6a provided on the side member 1 of the
The structure may be the excavation load measurement sensor 6b provided on the side member 1 of 5b, or the excavation load measurement sensor 6a, 6b provided on the side member 1 of each of the boom 5a and the arm 5b. The excavation load measuring sensor may be provided in a portion where the load appears remarkably. Further, the base machine to which the load measuring sensor is attached and the excavating work machine include a bulldozer ripper device, a bulldozer, a motor grader or a scraper blade device. Or wheel shovel or crawler shovel bucket device,
It may be a strength member of a working machine of another construction machine. still,
In terms of detection, by applying an alternating current or pulse of several kHz to 100 kHz to the exciting coil, a value representing the excavating force is easily output to the detection processing device 8.

[Effects of the Invention] As described above, the load measuring sensor according to claim 1 comprises the exciting coil wound around four through holes provided in the strength member made of a ferromagnetic material, and the detecting coil. Therefore, it has an advantage that it does not peel off. As a result, since the construction machine equipped with the excavation load measurement sensor using this load measurement sensor can be a construction machine that is permanently equipped with the load measurement sensor, the excitation coil power supply, and the detection processing device, Such a construction machine can contribute to safe work implementation and work efficiency improvement.

[Brief description of drawings]

FIG. 1 is an embodiment diagram of the load measuring sensor of claim 1, FIG. 2 is an explanatory view of the action, and FIG. 3 is an embodiment diagram of a construction machine with an excavating load measuring sensor according to claim 2, FIG. Is a sensor circuit diagram. 1 …… Strength member 2 …… Through hole 3a …… Excitation coil 3b …… Detection coil 4a, 4b …… Easy magnetization axis 6a, 6b …… Load measurement sensor 7 …… Excitation coil power supply 8 …… Detection processing device

Claims (2)

[Claims] 1. A strength member 1 made of a ferromagnetic material, wherein four through holes 2 are provided in the member surface and two through holes 2 are provided.
Excitation coil 3a wound through the coil and this excitation coil 3a
And a detection coil 3b wound through another two through-holes 2 so as to intersect with each other, and configured to measure a load applied to the member 1. 2. A construction machine comprising a working machine for excavation,
A construction machine with an excavation load measurement sensor, comprising a load measurement sensor according to claim 1 mounted on a strength member of the excavation work machine, an excitation coil power supply 7, and a detection processing device 8.