JP3312134B2 - Method of controlling reservoir thickness of dam filter material in dam filter material manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for producing a dam filter material which requires an enormous amount as a filling material for a rock fill dam. The present invention relates to a method for controlling the thickness of a reservoir when storing.

[0002]

2. Description of the Related Art Dam filter materials used as a filling material for rock fill dams are required to have functions of preventing viping and drainage, and are extremely important materials for embankment embankment materials, ensuring a uniform particle size distribution quality. It is necessary to.

Conventionally, to manufacture dam filter materials,
Workers dispersed the crushed stone and sand to obtain a uniform particle size distribution, but the productivity was extremely poor and required a great deal of labor. For this reason, it has recently been proposed to reduce labor and costs by converting the production process to mechanical equipment. In this production process, as shown in FIG. 7, a blasted ore 1 is collected by a shovel loader 2, transported to a production site by a dump truck 3, discharged to a grizzly bar 4, and then crushed through an apron feeder 5 (single toggle). The crushed stones are introduced into a crusher 6 and crushed. The obtained crushed stones are carried out by belt conveyors 7 and 8, discharged to an intermediate stock yard 9, and temporarily stored as a dam filter base material 10. Thereafter, the dam filter base material (crushed stone) 10 is collected by the shovel loader 2 and transported to the stock yard 11 by the dump truck 3, and the sand 12 purchased by the dump truck 3 is supplied to the stock yard 11 to supply fine particles.
The crushed stone and purchased sand are spread in layers in a bulldozer 13 and blended to adjust the particle size.
To be stored. And when building the rockfill dam,
The material is collected by the shovel loader 2 as a building material, loaded into the dump truck 3, and transported to the building site.

In the production process of the dam filter material 14, when the dam filter material 10 is stored in the intermediate stock yard 9, when the dam filter material falls from the belt conveyor 8, it is separated into coarse aggregates and fine aggregates, thereby causing unevenness. Particle size distribution,
When transported to the stock yard 11, the purchased sand 12 is carried in to replenish the fine particles as described above, and spread and layered in a bulldozer 13 to be blended. Therefore, the intermediate stockyard 9 and the stockyard 11 are required, and the production site is vast. In addition, loading and transporting of blasted ore 1, loading and transporting of dam filter base material (crushed stone) 10, and purchase sand 12
Transport equipment requires a large number of construction machines, such as a shovel loader 2 and a dump truck 3, and a bulldozer 13 to spread the crushed stones and purchased sand. This increases production equipment costs and increases energy consumption. However, the amount of combustion consumption and the amount of exhaust gas also increase, which is not preferable for energy saving and environmental measures.

[0005] In view of the above, the intermediate stockyard 9 is eliminated, the production site is reduced, and the loading and transport of the dam filter base material 10 is eliminated, so that the shovel loader 2 can be used.
As a method of manufacturing a dam filter material that reduces the number of construction machines such as a dump truck 3 and eliminates the spread of crushed stones and purchased sand, and eliminates the need for a bulldozer 13, a dam filter that can be immediately stored in a layered spraying method using a belt conveyor is produced. A material production method was developed.

In this dam filter material manufacturing method, as shown in FIG. 8, blasted ore 1 is collected by a shovel loader 2, transported to a production site by a dump truck 3, discharged to a grizzly bar 4, and passed through an apron feeder 5. Into a crusher (single toggle crusher) 6 for crushing. The obtained crushed stone is conveyed by a first belt conveyor 15, while purchased sand 12 is carried in by a dump truck 3 and stored in a sand bin 16. The purchased sand 12 is discharged from a sand bin 16 by a vibrating feeder 17 for cutting out onto a second belt conveyor 18, conveyed, discharged onto the first belt conveyor 15 and mixed with crushed stone,
Next, the mixed sand crushed stones are conveyed by a revolving belt conveyor 20 with a moving chute 19, and discharged over a wide area to a stock yard 21 below the revolving belt conveyor 20 with a moving chute 19, and the mixed sand crushed stone is removed from a dam filter material 22.
As low-rise storage. Then, at the time of constructing the rock fill dam, it is collected by the shovel loader 2 as a building material, loaded into the dump truck 3, and transported to the building site.

In the dam filter material manufacturing method, the swirling of the revolving belt conveyer 20 is performed to discharge the sand mixed crushed stone to a wide area on the stock yard 21 below the revolving belt conveyer 20 with the moving chute 19. The movement is performed by moving the moving chute 19 on the revolving belt conveyor 20. However, when the supply amount of the sand mixed crushed stone to the revolving belt conveyor 20 with the moving chute 19 fluctuates, the stock filter 21 removes the dam filter material 22. Storage levels change. During storage, dam filter material 2
When 2 is carried out to construct a rockfill dam, the storage level will be partially reduced. In such a state, if sand mixed crushed stone is released and storage continues, storage continues with only a part low, and even if sand mixed crushed stone can still be released at that location, it can not be released to other places, Shoot 19
The automatic revolving belt conveyor 20 cannot be automatically operated.

[0008]

SUMMARY OF THE INVENTION Therefore, according to the present invention, the supply amount of the sand mixed crushed stone to the revolving belt conveyor with the moving chute fluctuates, and the storage level of the dam filter material in the stock yard changes. Even if the dam filter material is taken out for construction of a rock fill dam during storage, and the storage level is partially reduced, the storage level of the dam filter material is always kept uniform. Another object of the present invention is to provide a dam filter material storage layer thickness control method in a dam filter material manufacturing method in which the thickness of the reservoir layer can be freely set.

[0009]

In order to solve the above-mentioned problems, a method for controlling the thickness of a dam filter material in a dam filter material manufacturing method according to the present invention is a method for controlling the thickness of a crushed stone obtained by a crusher using a first belt conveyor. The purchased sand is stored in a sand bin, and the purchased sand is cut out of the sand bin by a vibrating feeder for cutting out, discharged onto a second belt conveyor, transported, and discharged onto the first belt conveyor. The sand mixed crushed stone is then discharged onto a revolving belt conveyor with a moving chute, transported, and discharged over a wide area to a stock yard below the revolving belt conveyor with a moving chute to mix the sand. In the method of manufacturing a dam filter material in which crushed stone is stored as a dam filter material in a low layer, a level gauge is attached to each of the moving chutes of the revolving belt conveyor before and after the moving and moving. When the sand mixed crushed stone is discharged and stored in the lower stock yard by the mute, the storage level of the dam filter material in the stock yard is measured by the above two level meters before and after the moving chute, and if the storage level is below the set value, it is moved. The chute is moved slowly, and when the set value is exceeded, the moving chute is quickly moved to discharge and store the sand mixed crushed stone, thereby making the storage level uniform.

In the above method for controlling the thickness of the reservoir of a dam filter material, the moving chute is pulled forward or backward by a wire by the synchronous operation of the front and rear two motors, and the sand mixed crushed stone is loaded on the swiveling belt conveyor. In order to maintain the speed of the moving chute at the set value so that the moving chute does not move forward with no power, the dam filter material moves slowly when thickly piled up to the required level and quickly when thinly piled up. It is preferable to make the chute run.

In the above-described method for controlling the thickness of the reservoir of the dam filter material, it is preferable that the driving of the revolving belt conveyor, the traveling control of the moving chute, and the variable speed control are automatically performed using a fuzzy controller.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a method for controlling a reservoir thickness of a dam filter material in a method for manufacturing a dam filter material according to the present invention will be described. In the method for manufacturing a dam filter material described with reference to FIG.
As shown in FIG. 1, ultrasonic level meters 25 and 25 ′ are attached to the front and rear of the moving chute 19, respectively, and the sand mixed crushed stone is discharged and stored in the lower stock yard 21 as the dam filter material 22 by the moving chute 19. At this time, the storage level of the dam filter 22 material in the stock yard 21 before and after the moving chute 19 is compared with the two ultrasonic level meters 2.
Measured at 5, 25 'and when the storage level is below the set value,
The moving chute 19 is moved slowly, and when it is equal to or higher than the set value, the moving chute 19 is moved quickly to discharge and store the sand mixed crushed stone, so that the storage level of the dam filter material 22 in the stock yard 21 is made uniform. In the case of this example, the storage of the dam filter material 22 in the stock yard 21 is performed in a fan-shaped storage manner as shown in FIG. Blocks 21a, 21b, 21c are continuously formed, and a buffer band 26 is provided at the boundary between them.
The dam filter material 22 is stored for each of the storage blocks 21a, 21b, 21c. And each storage block 21
In the case of this example, the storage of the dam filter material 22 at a, 21b, and 21c is performed by alternately repeating the pattern A and the pattern B of the movement of the moving chute 19 shown in FIG. Stacked mixed crushed stones.

As shown in FIG. 4, the moving chute 19 of the revolving belt conveyor 20 is pulled by wires 27 and 27 'to move forward and backward. Further, in the state where the sand mixed crushed stone is placed on the belt 20a, the moving chute 19 tries to move forward without applying power, so when controlling the storage layer thickness,
The following three controls are simultaneously performed on the moving chute 19. (1) Motors 28 and 2 for moving forward and backward of the moving chute 19
8 ′ is synchronized, and the wire 27 or 27 ′ on the payout side is synchronized.
Do not sag. (2) When the moving chute 19 moves forward, the reversing (extending side) motor 28 'exerts a pulling (turning) force, and overcomes this to maintain the speed of the moving chute 19 at the set value. (3) In order to keep the height of the dam filter material 22 to be stored constant, a speed setting signal from the controller is received so that the moving chute 19 is run slowly when loading thickly and quickly when loading thinly. drive. These controls are difficult to control using only the motor with brake and the sequencer. Therefore, the motors 28 and 28 'for moving the moving chute 19 forward and backward, and the driving motor 29 for the revolving belt conveyor 20 are shown in FIG.
As shown in (5), the speed and torque are controlled by the inverters 30, 30 'and 32. Furthermore, to control the reservoir thickness,
A fuzzy controller 31 is incorporated, and an appropriate speed of the moving chute 19 is automatically set.

As an example, a moving chute 1 in an A pattern
A control method in a state in which 9 is moving forward will be described with reference to FIG. The moving chute 19 moves forward by a forward motor 28 driven by a forward inverter 30. At this time,
The reverse motor 28 'pays out the wire 27' while applying an electric brake, and is controlled so that the speed of the moving chute 19 does not rise above a set value. The control of the storage layer thickness in the storage block is performed as follows. First, a layer thickness per layer is set in the fuzzy controller 31. When the automatic operation starts, the layer thickness is controlled by the following logic. (1) Ultrasonic level meter 2 provided in front of moving chute 19
In step 5, the layer thickness before passing through the moving chute 19 is measured. (2) The present transport amount of the revolving belt conveyor 20 is calculated from the transport amounts of the belt scales 15a and 18a of the first belt conveyor 15 and the second belt conveyor 18 shown in FIG. (3) The transport amount of the revolving belt conveyor 20 and the belt 20a of the revolving belt conveyor 20 necessary for stacking the sand mixed crushed stone as the dam filter material 22 from the layer thickness before passing through the moving chute 19 to the set layer thickness. Calculate the driving speed. (4) A speed instruction is issued to the inverter 32 for driving the belt 20a of the revolving belt conveyor 20. (5) Further, the thickness of the layer after passing through the moving chute 19 is measured by an ultrasonic level meter 25 'provided at the rear of the moving chute 19. (6) If the layer thickness is smaller than the set value, increase the speed of the revolving belt conveyor 20. (7) If the speed of the revolving belt conveyor 20 has reached the upper limit, the moving speed (or revolving speed) of the moving chute 19 is reduced. (8) If the speed of the revolving belt conveyor 20 is the upper limit and the speed of the moving chute 19 is the lower limit, the apron feeder 5
(See FIG. 8). (9) If the layer thickness is larger than the set value, the speed of the revolving belt conveyor 20 is reduced. (10) If the speed of the revolving belt conveyor 20 has reached the upper limit, the moving speed (or revolving speed) of the moving chute 19 is increased. (11) If the transport amount of the first belt conveyor 15 and the second belt conveyor 18 shown in FIG. 1 becomes 0, the movement (or turning) of the moving chute 19 is stopped.

When the storage of the sand-mixed crushed stone as the one-layer dam filter material 22 is completed in this manner, the target value is automatically set to two.
Change to the height of the layer and continue storage. FIG. 5 shows a state in which the moving chute 19 is moving forward in the A pattern, but when moving backward, the moving chute 19 moves in the opposite direction.

When the second layer is stored in the pattern B, the moving chute 19 is fixed and the swiveling belt conveyor 20 is swiveled. The control method is basically the same as that in the case of the pattern A, except that the turning motor 29 of the turning type belt conveyor 20 is an inverter-driven variable speed motor, and an ultrasonic level meter is separately turned for right turning. Set for left turn,
A total of four ultrasonic level meters are provided.

The sand mixed crushed stone as the dam filter material 22 is stored in a storage block 21 of a stock yard 21.
a, 21b, and 21c, the base is widened when the reservoir thickness is high as shown in FIG. 6 and the base is narrow when the reservoir thickness is low as shown in FIG. Become. Therefore, unless the forward limit position of the moving chute 19 is changed according to the storage layer thickness, the product is stored on the trajectory of the turning rubber tire at the front end of the turning type belt conveyor 20, or the storage amount is reduced. Therefore, in the present invention, the program is incorporated into the fuzzy controller 31 so that the position of the forward end of the moving chute 19 can be automatically changed according to the current layer thickness.

The method for controlling the thickness of the reservoir of the dam filter material described above is an automatic control. However, if it is necessary to adjust the degree of storage, the swivel belt conveyor 20 and the moving chute 19 are moved manually. The dam filter material 22 may be stacked at an arbitrary position.

[0019]

As can be seen from the above description, the method for controlling the thickness of the dam filter material in the dam filter material manufacturing method of the present invention measures the storage level of the dam filter material in the stockyard with a level meter. If the storage level is less than the set value, move the moving chute slowly. If the storage level of dam filter material in the stock yard changes due to fluctuations in the supply amount of dam filter material, the dam filter material will be carried out during storage and the storage level will be partially reduced. Even so, the storage level of the dam filter material can always be kept uniform. In addition, since the storage chute of the dam filter material is set to a required level, the moving chute is run slowly when stacking thickly and quickly when stacking thinly, so that the thickness of the storage layer of the dam filter material can be set freely.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a swiveling type belt conveyor with a moving chute used in a method for controlling a reservoir thickness of a dam filter material of the present invention.

FIG. 2 is a plan view showing a state where three fan-shaped storage blocks are continuously formed in a stock yard for storing dam filter materials.

FIG. 3 is a view showing a moving pattern of a moving chute for discharging and storing a dam filter material in the storage block of FIG. 2;

FIG. 4 is a diagram showing a drive system of a revolving type belt conveyor with a moving chute.

FIG. 5 is a diagram showing a method for controlling the thickness of the reservoir of the dam filter material when the moving chute advances in the pattern A.

FIG. 6 is a diagram illustrating a front end position of a dam filter material depending on a difference in a reservoir thickness.

FIG. 7 is a schematic system diagram showing steps of a conventional dam filter material manufacturing method.

FIG. 8 is a schematic system diagram showing steps of an improved dam filter material manufacturing method.

[Explanation of symbols]

 6 Crusher 15 First belt conveyor 16 Sand bin 17 Cutting feeder 18 Second belt conveyor 19 Moving chute 20 Revolving belt conveyor 21 Stockyard 22 Dam filter material 25,25 'Ultrasonic level meter 27,27' Wire 28, 28 'Motor for moving the chute forward and backward 29 Driving motor for the revolving belt conveyor 30, 30' Inverter for forward and backward 31 Fuzzy controller 32 Inverter for driving

──────────────────────────────────────────────────の Continuing from the front page (72) Inventor Hiroaki Shimabukuro 4752, Nago, Nago City, Okinawa Prefecture Okinawa Development Agency Okinawa General Secretariat Northern Dam Office (72) Inventor Masanori Matsuura 1780 Kamikono, Yachiyo-shi, Chiba Shigeru Kawasaki (72) Inventor Masatoshi Takahashi 1780 Kamikono, Yachiyo-shi, Chiba Kawasaki Heavy Industries, Ltd. Yachiyo Plant (56) References JP-A-2000-64258 (JP, A) (58) (Int.Cl. ⁷ , DB name) E02B 7/06 E02B 7/00

Claims (3)

(57) [Claims] 1. A crushed stone obtained by a crusher is conveyed by a first belt conveyor, while purchased sand is stored in a sand bin, and the purchased sand is cut out from the sand bin by a vibrating feeder for cutting out the second sand belt. The sand mixed crushed stone is discharged on the first belt conveyor, mixed with the crushed stone, and then discharged on the revolving belt conveyor with the moving chute and conveyed. In a dam filter material manufacturing method in which sand mixed crushed stone is dumped as a dam filter material in a low-rise area and discharged into a stock yard below the belt conveyor, a level meter is provided before and after the moving chute of the revolving belt conveyor. When the sand mixed crushed stone is discharged and stored in the lower stock yard by the moving chute, the dam filter material of the stock yard before and after the moving chute The storage level is measured by the two level meters, and when the storage level is equal to or less than the set value, the moving chute is slowly moved, and when the storage level is equal to or more than the set value, the moving chute is quickly moved to discharge and store the sand mixed crushed stone, A method for controlling the thickness of a reservoir of a dam filter material in a method of manufacturing a dam filter material, wherein a storage level is made uniform. 2. A dam filter material storage layer thickness control method according to claim 1, wherein the moving chute is moved forward or backward by pulling on a wire by synchronous operation of two front and rear motors. When the sand crushed stone is loaded on the revolving belt conveyor, the speed of the moving chute is maintained at the set value so that the moving chute does not advance without power, and the storage level of the dam filter material is set to the required level. A method of controlling the thickness of a dam filter material in a dam filter material manufacturing method, wherein a moving chute is run slowly when stacking as thick as possible and quickly when stacking thinly. 3. A method for controlling a reservoir thickness of a dam filter material according to claim 1 or 2, wherein the driving of the revolving belt conveyor, the traveling control of the moving chute, and the variable speed control are performed. A method for controlling a reservoir thickness of a dam filter material in a dam filter material manufacturing method, wherein the method is automatically performed using a fuzzy controller.