JPH11130270A - Bucketful detector of continuous unloader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bucketful detector of a continuous unloader capable of accurately detecting a load handling amount during digging without time delay despite the fact that it is an easy method. SOLUTION: A distance sensor is installed at a specified angle θrelative to the windup part 4 of a bucket elevator. Also a distance (r) between the distance sensor and an object to be transported put in a bucket 2 during winding up is measured continuously, and the distance (r) measured with the distance sensor is processed by a coordinate transformation so as to obtain the cross-sectional form of the object to be transported put in the bucket 2. In addition, a calculation device 14 is installed to obtain, from the cross-sectional form, the volume of the object to be transported put in the bucket 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bucket filling amount detecting device for estimating a cargo handling amount in a bucket immediately after excavation in a continuous unloader.

[0002]

2. Description of the Related Art Conventionally, it is generally possible to detect fluctuations in the cargo handling amount of the entire bucket group by monitoring the driving torque of a bucket elevator, but it is necessary to estimate the cargo handling amount in a bucket immediately after excavation. However, since the length of the bucket elevator is as long as 20 to 40 meters, it is not suitable due to the problem of responsiveness.

[0003]

However, in order to quantitatively control the amount of cargo in the bucket immediately after excavation,
It is important to detect the cargo volume during excavation without time delay. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a purpose thereof is to provide a continuous unloader capable of accurately detecting the cargo handling amount during excavation without time delay while being a simple method. The present invention provides a bucket filling amount detecting device.

[0004]

According to the present invention, there is provided a continuous unloader for detecting a charged amount of a bucket in a continuous unloader, wherein the apparatus has a predetermined angle with respect to a winding portion of a bucket elevator. A distance sensor is installed to continuously measure the distance from the distance sensor to the conveyed object in the bucket being rolled up, and the distance measured by the distance sensor is subjected to coordinate transformation processing to cross-sectional shape of the conveyed object in the bucket. And an arithmetic unit for calculating the volume of the conveyed object in the bucket from the cross-sectional shape is provided.

[0005] With this configuration, it is possible to calculate the cross-sectional shape of the transported object accommodated in the bucket in the same manner as when the distance sensor is scanned in the depth direction of the bucket. Further, the volume of the object accommodated in the bucket can be obtained from the sectional shape of the object and the distance between the left and right side walls of the bucket which is known in advance.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the continuous unloader 1 includes a bucket elevator excavation unit 3 that moves a bucket 2 substantially horizontally, a hoisting unit 4 that rises almost vertically from the excavation unit 3, and a hoisting unit 4 A return wheel 5, and a drive wheel 6 is provided at a location where the direction is changed from the winding portion 4 to the return portion 5,
Driven wheels 7 and 8 are provided at both front and rear ends of the excavation unit 3. A large number of buckets 2 are attached at regular intervals to an endless chain 9 which is bridged between a driving wheel 6 and two driven wheels 7, 8.

On the other hand, a laser type distance sensor 10 is installed in front of the winding section 4. This distance sensor 10
As shown in FIG. 2, the laser beam 11 is installed obliquely downward so as to hit the rearmost portion 21 of the opening 20 of the bucket 2 at the beginning of the measurement. That is, the distance sensor 1
0 is installed so as to have a constant angle θ with respect to the winding section 4, in other words, the vertical line 12.

Further, as shown in FIG.
Is calculated by a controller 13 that receives a signal detected by the distance sensor 10, a calculating device 14 that calculates the volume of the raw material 22 stored in the bucket 2 based on a signal from the controller 13, and a calculating device 14. A display 15 for displaying the volume of the raw material is provided. The distance sensor 10 is, as shown in FIG.
4, but as shown in FIG. 4, or by using a scanning type distance sensor 10a as shown in FIG. Since a plurality of cross-sectional shapes can be obtained, the volume of the raw material can be measured more accurately.

While the driving wheel 6 is operating, the distance sensor 10 detects the distance between the bucket 2 and the distance sensor 10.
Measure the distance to inside continuously. The signal is input to the arithmetic unit 14 via the controller 13. The arithmetic unit 14 incorporates in advance a coordinate conversion formula for calculating the cross-sectional shape of the raw material 22 stored in the bucket 2 from the measurement value of the distance sensor 10.
Is scanned in the depth direction of the bucket 2, the cross-sectional shape of the raw material stored in the bucket can be calculated.

That is, when x is the depth direction of the bucket, y is the winding direction of the bucket, r is the measured value of the distance meter, t is the measurement time, θ is the mounting angle of the distance meter, v is the winding speed of the bucket, and the distance measured by the distance sensor 10 is The coordinate conversion formula for obtaining the sectional shape of the raw material 22 stored in the bucket 2 from the value r is represented by the following formulas (1) and (2).

That is, x (t) = r (t) · sin θ (1) y (t) = − ｛r (t) · cos θ + v (t) · t ２ (2) When the values of x and y are graphed, it becomes as shown in FIG. 7, and the cross-sectional shape of the raw material 22 stored in the bucket 2 can be visually observed.

Since the lateral width of the bucket 2 is known in advance, if the sectional area of the raw material 22 stored in the bucket 2 is known from the above equations (1) and (2), the bucket 2
The volume of the raw material 22 accommodated in the
4 can be easily obtained. The volume of the raw material 22 in the bucket 2 determined by the arithmetic unit 14 is displayed on the display 15.

Therefore, the operator operates to increase or decrease the feed speed of the unloader 1 in the direction of the arrow a in accordance with the excess or deficiency of the displayed cargo handling amount so that the payout amount becomes constant. It is also possible to perform quantitative control by automatic operation by feeding back the detected cargo handling amount to the feed speed.

[0014]

As described above, according to the present invention, in a continuous unloader, a distance sensor is installed at a predetermined angle with respect to a hoisting portion of a bucket elevator, and the inside of a bucket being hoisted from the distance sensor is installed. While continuously measuring the distance to the conveyed object, the distance measured by the distance sensor is subjected to coordinate conversion processing to obtain the cross-sectional shape of the conveyed object in the bucket, and from the cross-sectional shape, the volume of the conveyed object in the bucket is obtained. Since the calculation device for the calculation is provided, the cargo handling amount during excavation can be accurately detected without a time delay while being a simple method.

[Brief description of the drawings]

FIG. 1 is a side view of a bucket filling amount detection device according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of the bucket filling amount detecting device according to the present invention.

FIG. 3 is a plan view showing a case where only one distance sensor is provided for a bucket.

FIG. 4 is a plan view showing a case where a plurality of distance sensors are provided for a bucket.

FIG. 5 is a plan view showing a case where a scanning laser distance sensor is used.

FIG. 6 is an explanatory diagram for deriving a coordinate conversion equation.

FIG. 7 is an explanatory diagram showing a sectional shape inside a bucket by a laser distance sensor.

FIG. 8 is an overall side view of the unloader.

FIG. 9 is an overall plan view of the unloader.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Continuous unloader 2 Bucket 4 Bucket elevator hoisting part 10, 10a Distance sensor 14 Computing device 22 Workpiece r r Distance from the distance sensor to the workpiece in the bucket being hoisted

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hidekazu Harada 3-1-1, Tamano-shi, Tamano-shi, Okayama Mitsui Engineering & Shipbuilding Co., Ltd. (72) Inventor Shinji Hara 3-1-1, Tamano-shi, Tamano-shi, Okayama Mitsui Engineering & Shipbuilding Co., Ltd. Tamano Works

Claims (2)

[Claims] In a continuous unloader, a distance sensor is installed at a predetermined angle with respect to a winding section of a bucket elevator, and a distance from the distance sensor to a conveyed object in a bucket being wound is continuously measured. It is characterized in that an arithmetic unit for measuring and calculating the cross-sectional shape of the conveyed object in the bucket by performing coordinate transformation processing on the distance measured by the distance sensor and obtaining the volume of the conveyed object in the bucket from the cross-sectional shape is provided. A bucket filling amount detection device in a continuous unloader. 2. When x is the depth direction of the bucket, y is the winding direction of the bucket, r is the measurement value of the distance meter, t is the measurement time, θ is the mounting angle of the distance meter, and v is the winding speed of the bucket. The coordinate conversion formula for obtaining the cross-sectional shape of the transported object in the bucket from the distance to the transported object in the bucket measured by the distance sensor is expressed as: x (t) = r (t) · sin θ y (t) = − ｛r The bucket filling amount detection device in the continuous unloader according to claim 1, wherein (t) · cos θ + v (t) · t｝.