JPH05186196A - Weight measuring instrument for magnet type loader - Google Patents

Abstract

PURPOSE:To prevent damage to the detecting portion of a load detector and enhance the efficiency of measurement by providing a weight measurement means connected to the load detector, and providing a hydraulic ram opposite to the load detector, and providing the plunger of the hydraulic ram in such a manner that it can be made to abut on the detecting portion of the load detector. CONSTITUTION:A weight measuring instrument includes an upper frame 4 located at the end portion of a bucket arm 3, a lower frame 13 which can be moved toward and away from the frame 4, a load detector 17 which outputs a detection signal based on the weight of work magnetically attached to a magnet body 16, and a weight measurement means connected to the load detector 17, and a hydraulic ram 22 is provided opposite to the load detector 17 and its plunger 24 is provided in such a manner that it can be made to abut on the detecting portion of the load detector 17. When the plunger 24 of the hydraulic ram 22 abuts on the detecting portion of the load detector 17, the load detector 17 outputs a detection signal and the weight measurement means measures the weight of the work in response to the detection signal. In this case, excessive impact forces applied to the load detector 17 are cushioned and absorbed by the plunger 24 of the hydraulic ram 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weight measuring device for a magnetic loader, which measures the weight of loaded and unloaded materials such as scraps.

[0002]

2. Description of the Related Art Conventionally, as a weight measuring device of this kind, a loading plate c in which a track b can be loaded is provided in a pit a as shown in FIG. 6, and a load detector d, for example, a compression type load cell is mounted on the loading plate c. It is known that the load detector d is connected to the weight measuring means e.

However, for example, at the time of unloading work from a truck, the truck b is loaded with the processing material f loaded.
Is loaded on the loading plate c, the total weight is detected by the load detector d, and the weight of the processing material f is measured by the weight measuring means e.

[0004]

However, in the case of the above-mentioned conventional structure, it is uneconomical because the construction cost is required because the construction of the pit is required, and the total weight including the weight of the truck is detected by the load detector. Since the weights of the trucks are different due to such a structure, there is a disadvantage in that the structure for measuring the weight of the treated material tends to be complicated.

[0005]

An object of the present invention is to solve such inconvenience, and its gist is an electromagnet capable of magnetizing a bucket arm of an excavator excavator with a processing material such as scrap. In a magnet type loader including a magnet body, the upper frame is provided at the tip of the bucket arm, the lower frame is provided so as to be able to move toward and away from the upper frame, and the magnet body is provided. A load detector that outputs a detection signal according to the weight of the magnetically treated processing material, and a weight measuring means connected to the load detector, and a hydraulic ram is provided opposite to the load detector. A magnet-type loader weight measuring device characterized in that a plunger of the hydraulic ram is provided so as to be capable of contacting a detection portion of a load detector.

[0006]

[Operation] When the processing material is magnetically adhered by the magnet body and the bucket arm is lifted up, the lower frame moves away from the upper frame, and the plunger of the hydraulic ram comes into contact with the detection part of the load detector to detect the load detector. The part is pressed by a force corresponding to the weight of the processing material, the load detector outputs a detection signal, and the weight measuring means receives the detection signal and measures the weight of the processing material.

[0007]

1 to 5 show an embodiment of the present invention, in which a shovel excavator 1 is composed of a lower traveling machine body 1a and an upper turning machine body 1b, and a boom 2 is lifted up and down on the upper turning machine body 1b. It is possible to arrange it, and the bucket arm 3 is attached to this boom 2.
Is arranged so that it can be moved up and down.

Reference numeral 4 denotes an upper frame. In this case, the upper end of the bucket arm 3 is connected to the upper frame 4 by a connecting shaft 5.
One side is pivotally attached, the base of the elevation cylinder 6 is pivotally attached to the bucket arm 3 by the pivot shaft 7, and the base end of the link 8 is pivotally attached by the pivot shaft 9 toward the tip of the bucket arm 3. Then, the rod 6a of the elevation cylinder 6 is connected to the tip of the link 8 by the link shaft 10, the base end of the attachment link 11 is pivotally attached to the link shaft 10, and the attachment shaft 12 is attached to the tip of the attachment link 11. Thus, the other side of the upper frame 4 is pivotally connected.

Reference numeral 13 denotes a lower frame. In this case, a fulcrum shaft 14 is laid horizontally on one side of the upper frame 4, a projecting piece 15 is provided at one end of the lower frame 13, and the projecting piece 15 is attached to the fulcrum shaft 14. A magnet body 16 made of an electromagnet that can be excited and demagnetized is attached to the lower frame 13, and the lower frame 13 is provided so as to be able to swing slightly toward and away from the upper frame 4 about a fulcrum shaft 14. There is.

Reference numeral 17 is a load detector, in which a compression type load cell is adopted, and a mounting plate 18 is attached to the upper frame 4.
And the load detector 17 is attached to the mounting plate 18, and the load detector 17 is attached with the detecting portion 19 facing upward.
The load detector 17 is connected to the load detector 17 by the connection cord 20.
1 to be electrically connected.

Reference numeral 22 denotes a hydraulic ram. In this case, a rising bracket 23 is attached to the lower frame 13, the hydraulic ram 22 is attached to the rising bracket 23 so as to face the load detector 17, and a plunger 24 of the hydraulic ram 22 is provided. Is installed in a downward direction and is connected to the hydraulic ram 22 by a hydraulic hose 25 via a pressure control valve and a relief circuit (not shown) to the hydraulic ram 22 so that the pressure inside the hydraulic ram 22 can be set and the plunger 24 is set. When a force over the pressure is applied, the oil in the hydraulic hose 25 escapes to the tank (not shown) and the plunger 2
4 is configured to be able to immerse and retract.

Reference numeral 26 is a stopper mechanism. In this case, a stopper hook portion 27 is formed on the lower frame 13,
A stopper portion 28 is formed on the mounting plate 18 of the upper frame 8 so that the stopper hook portion 2 is located farther than the facing gap t between the detection portion 19 of the load detector 17 and the plunger 24 of the hydraulic ram 22.
It is set so that the facing gap T between the stopper 7 and the stopper portion 28 becomes large.

In this case, the load measuring means 21 receives a detection signal from the load detector 17 and calculates and measures the magnetic attachment amount of the treatment material f magnetically attached to the magnet body 16,
The display unit 30 is provided near the driver's seat and displays a net weight and a cumulative weight, and is provided with an alarm unit 31 including a buzzer for excessive magnetism.

Since this embodiment has the above-mentioned structure, the processing material f such as scrap carried by the truck b is f.
When carrying out the loading work, the shovel excavator 1 is operated to bring the magnet body 16 into contact with the processing material a to be loaded,
The electromagnet of the magnet body 16 is excited to magnetically attach the processing material,
When the bucket arm 3 is lifted in the magnetically attached state, the lower frame 13 slightly swings downward with respect to the upper frame 4 about the fulcrum shaft 14, and this swing causes the detecting portion 19 of the load detector 17 to move to the hydraulic ram. 22 plunger 24
Contacting each other, the detecting portion 19 of the load detector 17 is pressed by a force corresponding to the weight of the magnetically treated processing material f, and the load detector 17 outputs a detection signal corresponding to the weight of the processing material f. Upon receiving the detection signal, the calculation unit 29 of the weight measuring means 21 measures the weight of the processing material, and the display unit 30 displays the measured value.

The lower frame 13 swings slightly with respect to the upper frame 4 about the fulcrum shaft 14, and the detecting portion 19 of the load detector 17 is subjected to a force corresponding to the weight of the magnetically treated material f. When pressed, the detection unit 19 is not directly pressed by the lower frame 13 but is pressed by the plunger 24 of the hydraulic ram 22, so that the excessive shock force at the time of initial contact is absorbed by the plunger 24. Becomes
It is possible to prevent damage to the detection unit 19, and also to prevent damage to the detection unit 19 by retracting and retracting the plunger 24 when an excessive force acts on the detection unit 19.

Further, in this case, the stopper portion 28 of the stopper mechanism 26 contacts the stopper hook portion 27 to prevent excessive downward swinging of the lower frame 13, and in this case, when an excessive force acts on the detecting portion 19, a display is made. The unit 30 will display that measurement is impossible.

The structure of the load detector 17 and the circuit configuration of the weight measuring means 21 are appropriately changed and designed.

[0018]

As described above, according to the present invention, when the processing material is magnetically adhered by the magnet body and the bucket arm is lifted, the lower frame moves away from the upper frame, and the plunger of the hydraulic ram is mounted on the detecting portion of the load detector. Contact with each other, the detection part of the load detector is pressed by a force corresponding to the weight of the processing material, the load detector outputs a detection signal, and the weight measuring means receives the detection signal and measures the weight of the processing material. In this case, the excessive impact force on the load detector is absorbed and absorbed by the plunger of the hydraulic ram, so that the detector can be prevented from being damaged and the measurement efficiency can be improved accordingly.

As described above, the intended purpose can be sufficiently achieved.

[Brief description of drawings]

FIG. 1 is an overall side view of an embodiment of the present invention.

2 is a partial cross-sectional view of the embodiment shown in FIG.

FIG. 3 is a partial plan sectional view of the embodiment shown in FIG.

FIG. 4 is a partially enlarged sectional view of the embodiment shown in FIG.

5 is a block diagram of load measuring means of the embodiment shown in FIG. 1. FIG.

[Explanation of symbols]

 f Processing material 1 Excavator excavator 4 Upper frame 13 Lower frame 17 Load detector 19 Detecting unit 21 Load measuring means 22 Hydraulic ram 24 Plunger

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[Procedure amendment]

[Submission date] December 22, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 6

[Correction method] Added

[Correction content]

FIG. 6 is an explanatory diagram of a conventional weight measuring device.

Claims (1)

[Claims] 1. A magnet type loader having a bucket arm of an excavator excavator equipped with a magnet body made of an electromagnet capable of magnetizing a treatment material such as scrap, and an upper portion provided at a tip end portion of the bucket arm. A frame, a lower frame disposed so as to be able to move toward and away from the upper frame, a load detector for outputting a detection signal according to the weight of the processing material magnetically attached to the magnet body, and the load detector. And a hydraulic ram that is opposed to the load detector, and a plunger of the hydraulic ram is provided so as to be able to abut on a detection portion of the load detector. Magnet type loader for loaders.