JPH1057725A - Ultralow frequency attenuator for vibrating screen dehydrator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To completely prevent noise pollution due to vibrating screen dehydrators by causing interference of ultralow frequency sounds among plural vibrating screen dehydrators in opposite phase to each other to attenuate them and furthermore casing interference of ultralow frequency sounds generated from both the ends of connected plural vibrating screen dehydrators in opposite phase with each other by reflecting plates to attenuate them. SOLUTION: Plural vibrating screen dehydrators 5a, 5b, 4c, 5d are arranged side by side, and are connected with unbalance weights each provided on the vibrating screen dehydrators in opposite phase to each other so that ultralow frequencies generated from the vibrating screen dehydrators may be offset. All the plural vibrating screen dehydrators are shielded by an upper reflecting plate 15 and side reflecting plates 16 parallel to each other, allowing ultralow frequency sounds generated from both the ends of the connected plural vibrating screen dehydrators to be attenuated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibrating sieve for attenuating an ultra-low frequency generated by a vibrating sieve dewatering machine for separating muddy water generated when excavating an underground tunnel or the like into water and earth and sand. The present invention relates to an ultra-low frequency attenuator for a dehydrator.

[0002]

2. Description of the Related Art Muddy water generated from a face or the like by excavation work in an underground tunnel or the like contains earth and sand such as gravel, crushed stone, and sand in addition to moisture. It is used to separate water and earth and sand.

[0005] That is, as shown in FIG. 5, muddy water that has springed on a face 1 is sucked to the ground by a suction pump 2, and
, Where it is separated into earth and sand and water, and the water is discharged to the tank 4. Since the sediment discharged from the cyclone 3 contains water, it is sieved by a vibrating sieve dewatering machine 5 to dewater it.
To carry out.

Further, since the water dehydrated by the vibrating sieve dehydrator 5 contains minute earth and sand, it is stored in a raw water layer 8 installed below, sucked up by a submersible pump 9 and returned to the vibrating sieve dehydrator 5 again. I have to hang it.

[0005] Such a vibrating sieve dewatering machine 5 comprises a vibration generator 10 and a screen 11. The vibration generator 10
As shown in FIGS. 6A and 6B, two unbalanced weights 13 are arranged in parallel in a direction facing each other.
The drive motor 12 is connected to one of the unbalance weights 13 to rotate, and the other unbalance weight 1 is rotated.
Numeral 3 is connected to one of the unbalance weights 13 so as to rotate in the reverse direction.

Accordingly, the drive motor 12 is operated to rotate both the unbalance weights 13 and 13 so that
When they reach the opposing position (or the opposite position) as shown in (a), they cancel each other out and do not vibrate, but when both are in the same direction as shown in FIG. (The direction indicated by the thick arrow in (b)). Then, the vibration generated in the vibration generator 10 is transmitted to the screen 11, and the earth and sand dropped on the screen 11 is sieved by the vibration to dehydrate.

[0007]

In recent years, noise generated from such a vibrating sieve dewatering machine has become a problem. In particular, when a plurality of the vibrating sieve dehydrators are installed as shown in FIGS. 9 and 10, the extremely low frequencies generated from each of them cause resonance amplification with each other, and generate extremely unpleasant very low frequency sounds.

In order to prevent such noise, a vibrating sieve dewatering machine is shielded by a soundproof house.
The extremely low frequency sound cannot be absorbed by the sound absorbing material provided in the soundproof house, and it is extremely difficult to prevent the sound.

On the other hand, in order to prevent such an extremely low frequency sound, as shown in FIG.
Of the unbalance weights 13, 13,...
The rotation shafts 1 of the motor drive side are arranged such that the unbalance weights 13 on the motor drive side rotate eccentrically in opposite phases.
A device in which the shafts 4 and 14 are connected by a shaft 20 has been developed.

According to such an apparatus, as shown in FIG. 8, the very low frequency (waveform of FIG. 8 (a)) generated from one vibrating sieve dehydrator 5a and the other from the other vibrating sieve dehydrator 5b. The generated very low frequency of the opposite phase (the waveform of FIG. 8B) is shown in FIG.
As shown in FIG.

However, when the ultra-low frequencies of the plurality of vibrating sieve dehydrators 5, 5,... Resonate as shown in FIGS. 9 and 10, the ultra-low frequencies of the adjacent vibrating sieve dehydrators are in opposite phases. Can be attenuated due to interference, but the ultra-low frequency generated at both ends where the plurality of vibrating sieve dehydrators 5, 5,... Are diffused outward as indicated by the two-dot chain line arrow. There is a problem that the very low frequencies of the phases do not interfere with each other, so that the very low frequency sound cannot be completely prevented.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. Ultra low frequency sounds of a plurality of vibrating sieve dehydrators are attenuated by interfering with each other in opposite phases to each other. Ultra-low frequency sound generated from both ends of the connected vibrating sieve dewatering machine is attenuated by making them interfere with each other in opposite phase by a reflector, so that the noise pollution caused by the vibrating sieve dewatering machine is completely prevented. It is an object of the present invention to provide an ultra-low frequency damping device for a sieve dewatering machine.

[0013]

In order to achieve the above object, an ultra-low frequency damping device for a vibrating sieve dewatering machine according to the present invention cancels out ultra-low frequencies generated from a plurality of vibrating sieve dewatering devices arranged in parallel. The whole of the plurality of vibrating sieve dehydrators connected by shifting the phase of the unbalance weights provided in each vibrating sieve dehydrator so as to be shielded by an upper reflective plate and a lateral parallel reflective plate. Ultra-low frequencies generated from both ends where the plurality of vibrating sieve dehydrators are connected are attenuated.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing a state in which a plurality of vibrating sieve dewaterers of the present invention are connected to each other and a reflecting plate is provided.
FIG. 2 is a top view showing a state in which a plurality of vibrating sieve dehydrators of the present invention are connected to each other and a reflecting plate is provided. FIG. 3 is a longitudinal sectional view showing the reflection state of the very low frequency in FIG. FIG. 4 is a top view showing the reflection state of the very low frequency in FIG. 2 by the dotted line of the arrow.

As shown in FIG. 1, four vibrating sieve dehydrators 5a, 5b, 5c and 5d are juxtaposed on the ground. The configuration of each vibrating sieve dewatering machine is the same as that shown in FIG. 7, and each vibration generator 10 has a pair of unbalanced weights 13, 13 eccentrically rotated in opposite directions by a motor 12.
The vibration generator 10 has a screen 11
, The vibration of the vibration generator 10 is transmitted to the screen 11.

Further, in this vibrating sieve dewatering machine, as shown in FIG. 8, of the pair of unbalance weights 13 of the vibration generator 10, the unbalance weight 13 on the motor drive side is used. The rotating shaft 14 is connected to the rotating shaft 14 of the unbalanced weight 13 on the motor drive side of the adjacent vibration generator 10 by a shaft 20, and the unbalanced weights 1 are rotated so as to perform eccentric rotations in opposite phases to each other.
The eccentricity of 3 and 13 is fixed and shifted.

When an even number of vibrating sieve dehydrators are installed, the phases of the unbalance weights 13, 13 on the motor drive side of the vibrating sieve dehydrators 5a, 5b, 5c, 5d are sequentially shifted by 180 °. It is connected and fixed by the shaft 20 while being shifted.

In such a configuration, each of the vibrating sieve dehydrators 5a, 5b, 5c, and 5d individually transmits vibration to the respective screens 11, but the two vibrating sieve dehydrators have a low frequency. It occurs in the opposite phase. For example, the low frequency generated from the vibrating sieve dehydrator 5a shown in FIG.
The low frequency generated from the vibrating sieve dehydrator 5b shown in FIG. 9B interferes with each other and attenuates as shown in FIG. 9C.

Although not shown, when an odd number of the vibrating sieve dehydrators 5 as described above, for example, three vibrating sieve dehydrators 5 are juxtaposed, the shaft connecting the unbalanced weights is sequentially turned by 120 °. If the phase is shifted and fixed, and if five units are connected and fixed by shifting the phase sequentially by 72 ° each time, if 360 ° is connected and fixed every phase divided by the number of vibrating sieve dehydrators, The ultra-low frequency generated from the vibrating sieve dewatering machine is reduced as a whole, and no resonance occurs.

However, such a method in which a plurality of vibrating sieve dehydrators 5a, 5b, 5c, and 5d are juxtaposed and connected and fixed by shifting the phase of the adjacent ones as described above, Although the very low frequency of each other is attenuated, as shown in FIGS. 10 and 11, a plurality of vibrating sieve dehydrators 5a, 5b,
The very low frequency generated outward from both ends where 5c and 5d are connected is diffused without interference.

Therefore, in the present invention, FIGS.
As shown in FIG.
The entirety of b, 5c and 5d are shielded by an upper reflector 15 and laterally parallel reflectors 16, 16 and 17, 17.

These reflecting plates 15, 16, 17 may be formed as a wall plate or a top plate made of metal or concrete.

With such a configuration, the vibrating sieve dewatering machines 5a, 5a, 5a,
The very low frequency generated from both ends where b, 5c, and 5d are connected or the very low frequency that cannot be completely attenuated by the above-described low frequency reduction device is disposed to face the upper reflector 15 and the ground, and to the side. After being reflected by the inner walls of the reflecting plates 16, 16 and 17, 17, they can be attenuated by interfering with each other in opposite phases.

[0025]

As described above, the ultra-low frequency damping device of the vibrating sieve dewatering machine of the present invention has a phase that reduces the eccentric state of each unbalanced weight of the plurality of vibrating sieve dewatering machines. By connecting and fixing via the shaft,
The very low frequency generated from each vibrating sieve dewatering machine can be attenuated mutually.

Further, the ultra-low frequency generated from both ends of the plurality of vibrating sieve dehydrators connected to the plurality of vibrating sieve dehydrators which could not be attenuated by such an ultra-low frequency preventing means causes the entire plurality of vibrating sieve dehydrators to move upward and downward. Shielded by a reflector provided on the side,
As a result of the vibration waves reflected by the respective opposedly arranged reflectors being attenuated by interfering with each other in opposite phases, it is possible to completely eliminate the ultra-low frequency from the vibrating sieve dewatering machine.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a state where a plurality of vibrating sieve dehydrators of the present invention are connected to each other and a reflecting plate is provided.

FIG. 2 is a top view showing a state in which a plurality of vibrating sieve dewaterers of the present invention are connected to each other and a reflecting plate is provided.

FIG. 3 is a longitudinal sectional view showing a reflection state of an extremely low frequency in FIG. 1 by a dotted line.

FIG. 4 is a top view showing a very low frequency reflection state in FIG. 2 by a dotted line;

FIG. 5 is a flow chart in which mud water supplied from a face is separated into earth and sand and water by using a conventional vibrating sieve dewatering machine.

FIG. 6 is a schematic view showing the structure of a vibration generator provided in a vibrating sieve dewatering machine.

7 is a diagram showing a configuration in which adjacent vibration generators of FIG. 6 are connected to each other by a shaft to attenuate an extremely low frequency.

FIG. 8 is a waveform diagram showing a situation where low frequencies generated from two vibrating sieve dehydrators are attenuated by the apparatus of FIG. 7;

FIG. 9 is a front view showing a state where an ultra-low frequency generated from both ends where a plurality of conventional vibrating sieve dehydrators are connected is diffused outward.

FIG. 10 is a top view showing a state in which an ultra-low frequency generated from both ends where a plurality of conventional vibrating sieve dehydrators are connected is diffused outward.

[Description of Symbols] 5 (5a, 5b, 5c, 5d): Vibrating sieve dewatering machine 10: Vibration generator 11: Screen 12, Motor 13, Unbalance weight 14, Rotary shaft 15, Upper reflector 16, 17, Side reflection plate 20 ... Shaft

Claims (1)

[Claims] 1. A plurality of vibrating sieve dewaterers connected to each other by shifting the phases of unbalance weights provided in each vibrating sieve dewaterer so as to cancel out ultra-low frequencies generated from a plurality of vibrating sieve dewaterers arranged in parallel. The whole machine is shielded by an upper reflector and a side parallel reflector, thereby attenuating ultra-low frequencies generated from both ends of the plurality of vibrating sieve dehydrators connected to each other. Ultra-low frequency damping device of vibrating sieve dewatering machine.