JP3312778B2 - Method and apparatus for measuring the carry-in flow rate of a vertical and steeply inclined conveyor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for measuring a carry-in flow rate of a vertical and steeply inclined conveyor.

[0002]

2. Description of the Related Art A typical prior art is disclosed in Japanese Utility Model Laid-Open No. 59-31.
649. In this prior art, in order to detect the excavation amount of an earth-moving machine such as a bucket wheel excavator, the turning amount of a rudder to which the bucket wheel 13 is attached is detected, and the excavating amount corresponding to the turning amount is calculated. I do. In this prior art, it is difficult to accurately determine the excavation amount due to the operating conditions of the bucket wheel and the like.

Another prior art is Japanese Patent Application Laid-Open No. Hei 4-235831, in which the position of the upper surface of an excavated object in a bucket, such as an unloader or a reclaimer, is detected by a lightwave distance detector, whereby the excavated object in the bucket is detected. Seeking the amount of. In such prior art, the amount of error may occur depending on the degree of reflection of the excavated object.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and an apparatus for measuring the carry-in flow rate of a vertical and steeply inclined conveyor, which can accurately measure the carry-in flow rate.

[0005]

According to the present invention, the distance from the loading position to the unloading position of a vertical and steeply inclined endless conveyor running at a constant speed U is L, and K is a constant. Let Δt0 = L / (KU),
At this sampling interval Δt0 time, the load amount corresponding to the torque driving the conveyor or the load current of the motor is detected, and the amount to be loaded on the conveyor during the first Δt0 time is Δ
Assuming that Q0, the load after time (K + 1) · Δt0 is Q1, and the load after time K · Δt0 is Q0, the carry-in amount ΔQi and ΔQi = Q1−Q0 + ΔQ0 at time Δt0 are obtained, and the inflow flow rate is Qi. , Qi = ΔQi / Δt0, which is a method for measuring the carry-in flow rate of a vertical and steeply inclined conveyor.

The present invention also provides a motor for driving an endless conveyor for vertical and steep inclines, means for driving the motor so that the conveyor runs at a predetermined constant speed, and a torque or motor load for driving the conveyor. A means for detecting the current and a distance from the carry-in position to the carry-out position of the conveyor are L, and a sampling interval Δt0 = L / (KU)
Each time, the torque or load current is sampled, the load corresponding to the torque or load current is detected, the load on the conveyor at the first time Δt0 is defined as ΔQ0, and the load after time (K + 1) · Δt0 is calculated. Q1 and time K · Δ
Assuming that the loading amount after t0 is Q0, means for determining the carry-in amount ΔQi, ΔQi = Q1-Q0 + ΔQ0 at time Δt0, and means for calculating the carry-in flow rate Qi, and Qi = ΔQi / Δt0 are provided. This is a device for measuring the carry-in flow rate of the tilting conveyor.

[0007]

According to the present invention, the conveyor for vertical and steep inclination runs at a constant speed U, and the sampling time Δt0
Each time, the torque driving the conveyor or the load current of the motor is sampled and detected, and the carry-in amount ΔQi at the time Δt0 is calculated based on the detection result, thereby calculating the carry-in flow rate Qi. Thus, the flow rate of the load carried in from the lower part of the conveyor can be measured.

[0008]

FIG. 1 is a simplified side view showing the entire structure of an embodiment of the present invention. In an unloader, a reclaimer, or the like, the vertical or steeply inclined conveyor 1 is, for example, a conveyer provided with an end, and an endless belt-shaped carrier 4 is wound between a lower sprocket wheel 2 and an upper sprocket wheel 3. The transport body 4 is driven to rotate by a motor 6 as indicated by an arrow 5, and a load from below is lifted and transported. Carrier 4
The amount of load carried by the vehicle varies as shown in FIG. The rotation speed of the motor 6 is determined by a rotation speed detector 7
The control circuit 8 drives the motor 6 to keep the rotation speed constant, whereby the speed of the carrier 4 is set to a constant value U. The load current of the motor 6 is shown in FIG.
Is detected by a load current detector 9 shown in FIG. 1, and the measurement result is given to a processing circuit 10 realized by a microcomputer or the like. The load current of this motor 6,
Therefore, the relationship between the torque T and the loading amount Q of the carrier 4 is
It is measured in advance and stored in the memory 14. The processing circuit 10 operates the load current detector 9 via the line 11 to perform a sampling operation. When the speed U of the carrier 4 is constant as described above, the distance from the carry-in position 12 on the sprocket wheel 2 of the carrier 4 to the carry-out position 13 of the sprocket wheel 3 is L, and K is a natural number constant. Virtually, the conveyed material flowing in the time Δt0 is loaded on the length ΔL = L / K obtained by equally dividing the length L by K, and every time Δt0, the transported material rises by the length ΔL. proceed.

Δt 0 = L / (K · U) (1) After the load is carried into the carry-in position 12, the time taken to be carried by the carrier 4 to the carry-out position 13 is t 0.

T0 = L / U (2) The load current, and thus the torque T, is measured when the load is
Starting from the state not above, measurement is performed at the sampling interval Δt0, and at least two consecutive measured values are stored in the memory 14 of the processing circuit 10 at least continuously. Consider a state after a time (K + 1) .DELTA.t0 since the load starts to be loaded. Assuming that the amount loaded on the transport body 4 at the first time Δt0 is ΔQ0, the time (K
After +1) .DELTA.t0, this is in a state of being unloaded from the unloading position 13.

The load amount on the transport body 4 after the time (K + 1) .Δt0 is Q1, the carry-in amount at the time Δt0 at this time is ΔQi, and the load amount on the transport body 4 after the time K.Δt0 is Q0. Then, the relationship of Q1 = ΔQi + Q0−ΔQ0 (3) holds. This can be rewritten as ΔQi = Q1−Q0 + ΔQ0 (4), and is an equation for calculating the carry-in amount ΔQi at the time Δt0 to the conveyor.

The terms Q1 and Q on the right-hand side of Equation 4 above
0 can be detected from the load current measured at the sampling interval Δt0 time, that is, the torque T, as described above, and ΔQ0 is the amount applied in the first time Δt0, and the torque relating only to this weight is calculated. And can be considered known. From this, the amount ΔQi that has flowed into the transporting body 4 at the time Δt0 after the time K · Δt0 from when it was placed on the transporting body 4 of the conveyor is obtained. Therefore, the inflow flow rate Qi is obtained from Expression 5.

Qi = ΔQ0 / Δt0 (5) The load carried on the transporter first and the amount transported to the transporter 4 until the load is first unloaded from the transporter 4 are measured every sampling. From the applied load current, and thus the torque difference.

The state in which the specific amount conveyed during the sampling interval Δt0 is located on the carrier 4 is determined as follows. The carrier 4 is divided into K elements of K〜1 and K〜
Consider an array variable with 0 K + 1 elements. The elements K to 1 of the array variables correspond to the element numbers of the carrier 4. Assuming that the loading amount corresponding to an arbitrary element i of the transport body is g (i), the amount transported to the 12 points of the transport body is g (K). In the variables, g (i) → g (i−1) and i = k → 1 are sequentially raised and substituted. By repeating such an operation, values are determined for all elements.

G (0) is the amount discharged from the conveyor during the time Δt0.

[0016] After the now load is carried out, the position the load capacity of that point on the conveyor is identified, the load current thus torque T _n, the Q0, Q1 determined from T n _{+ 1,} the above-mentioned The inflow amount can be calculated by Expression 4. Such an operation is performed by the processing circuit 10. The carry-in flow rate Qi thus obtained can be visually displayed or printed by the output means 15 and output. In addition, the excavating means 16 such as a bucket wheel that excavates and loads a load at the loading position 12 can be controlled so that the loading flow rate Qi is constant.

[0017]

As described above, according to the present invention, it is possible to detect the flow rate of the load carried into the lower part of the vertical and steeply inclined conveyor with high accuracy without causing a measurement delay. In addition, according to the present invention, by detecting the drive torque of the conveyor or the load current of the motor, for example, a calculation is performed using a microcomputer to measure the carry-in flow rate, so that the configuration can be simplified. Also achieved.

[Brief description of the drawings]

FIG. 1 is a simplified side view showing an entire configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing an amount of load conveyed by a conveyor 1.

FIG. 3 is a block diagram showing an electrical configuration of the embodiment shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conveyor 2, 3 Sprocket wheel 4 Endless carrier 6 Motor 7 Rotation speed detector 8 Control circuit 9 Load current detector 10 Processing circuit 12 Loading position 13 Loading position 14 Memory 15 Output means 16 Excavation means

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Takashi Nakano 3-1-1, Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries, Ltd. Kobe Plant (56) References JP-A-1-104510 (JP, A JP-A-50-92769 (JP, A) JP-A-59-146321 (JP, U) JP-A-46-18145 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01G 11 / B65G 43/08

Claims (2)

(57) [Claims] 1. A sampling interval Δt where L is a distance from a loading position to a loading position of a vertical and steeply inclined endless conveyor running at a constant speed U, and K is a constant.
0 = L / (KU), and this sampling interval Δt0
At each time, the loading amount corresponding to the driving torque of the conveyor or the load current of the motor is detected, the loading amount on the conveyor during the first Δt0 time is ΔQ0, and the loading amount after the time (K + 1) · Δt0 is Q1. When the load amount after the time K · Δt0 is Q0, the time Δt0
A method for measuring the carry-in flow rate of a vertical and steeply inclined conveyor, wherein the carry-in quantity ΔQi, ΔQi = Q1−Q0 + ΔQ0 is obtained, and the inflow flow rate is Qi, Qi = ΔQi / Δt0. 2. A motor for driving an endless conveyor for vertical and steep inclination, means for driving the motor so that the conveyor runs at a predetermined constant speed, and detecting a torque for driving the conveyor or a load current of the motor. Means, and the distance from the carry-in position to the carry-out position of the conveyor is L,
At each sampling interval Δt0 = L / (KU), a torque or a load current is sampled to detect a load amount corresponding to the torque or the load current, and a load amount on the conveyor at the first time Δt0 is defined as ΔQ0. Time (K + 1) · Δ
When the load after t0 is Q1 and the load after time K · Δt0 is Q0, the carry-in amount ΔQi at time Δt0, ΔQi = Q1-Q0 + ΔQ0 are obtained, and the carry-in flow rate is Qi, and Qi = ΔQi / Δt0. Means for measuring the carry-in flow rate of a vertical and steeply inclined conveyor.