JPH0584486A - Device for sucking floating material on liquid surface - Google Patents

Abstract

PURPOSE:To surely hold the suction port provided at the tip of a suction pipe extended to the liq. surface from below on a liq. surface where the floating material on the liq. surface is efficiently sucked by accurately detecting the liq. level in a waste liq. storage tank, etc. CONSTITUTION:The suction port 2 of a suction pipe 1 is moved up and down by a lift 9 in accordance with the liq. level detected by a sonic level gage 17 to surely place the suction port 2 on the surface, and water is intermittently sprinkled by a shower nozzle 18 on the liq. surface with the level to be measured by the level gage 17 to remove the bubbles, etc., on the liq. surface. Consequently, the sound wave and ultrasonic wave transmitted from the level gage 17 are not reflected by the bubbles to be formed on the liq. surface, and the level is not erroneously detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for sucking suspended matter on the liquid surface, which sucks suspended matter such as oils and paint debris floating on the liquid surface of a waste liquid storage tank or the like with a suction pipe.

[0002]

2. Description of the Related Art A suction device of this type is provided with a suction port for sucking suspended matter on the liquid surface at the tip of a suction pipe extending from the liquid toward the liquid surface. In order to efficiently suck only suspended matter without sucking liquid or liquid, it is common to hold the liquid at the liquid surface position by a float that follows the level change of the liquid surface (Japanese Patent Publication No. 47-13215). Mitsuko Sho 56-20074
No. 57/9831, JP-A-63-16209.
No. 3).

[0003]

However, a float floating on the liquid surface is easily shaken under the influence of wind waves, and especially when a strong wind such as a typhoon causes a large swell on the liquid surface.
Because it tilts greatly to the left and right and repeats abrupt vertical fluctuations, the suction port protrudes so that it completely separates from the liquid surface position, and suspended matter on the liquid surface is not sucked in from the suction port, and only a large amount of air is drawn. May be inhaled. Then, when a large amount of air is sucked from the suction port, the inside of the suction pipe extending from the liquid toward the liquid surface is completely hollowed,
The whole suction pipe receives a large buoyancy force and floats on the liquid surface, which may cause the float to fall and the suction port may not be able to return to the original state while protruding above the liquid surface.

Although a weight is devised to prevent the suction port from projecting above the liquid surface, the weight of the float decreases the buoyancy of the float. There is a risk that it will completely sink into and absorb a large amount of liquid. Therefore, the present invention, without being affected by wind waves,
The main technical issue is to be able to reliably hold the suction port provided at the tip of the suction pipe at the liquid surface position.Moreover, the level change of the liquid surface is accurately detected and the suspended matter on the liquid surface is efficiently removed. Another technical challenge is to be able to absorb well.

[0005]

In order to solve this problem, according to the present invention, a suction port for sucking suspended matter on the liquid surface is provided at the tip of a suction pipe extending from the liquid toward the liquid surface. In a device for sucking suspended matter on a liquid surface, a lifting drive device for raising and lowering the suction port to hold it at a liquid surface position, an acoustic wave level meter provided integrally with the suction port so as to be vertically movable, and the level. And a controller for outputting a position adjustment signal for moving the suction port up and down according to the level change of the liquid level detected by the meter to the lifting drive device, and intermittently toward the liquid level serving as the measurement level surface of the level meter. The shower nozzle that sprays water is provided so as to be vertically movable integrally with the level meter.

[0006]

According to the present invention, when the liquid level changes,
A position where a sound wave level meter that is vertically movable integrally with the suction port that sucks up suspended matter on the liquid level detects a level change of the liquid level, and the control device moves the suction port up and down according to the level change. The adjustment signal is output to the lifting drive device. As a result, the suction port is moved up and down by the elevating drive device and held at the liquid level position, so that the float floating on the liquid level detects the level change of the liquid level and follows the change as in the conventional example. ,
There is no possibility that the suction port will be separated from the liquid surface under the influence of wind waves, and the suction port can be reliably held at the liquid surface position.

If water is intermittently sprinkled by the shower nozzle toward the liquid level, which is the measurement level surface of the sonic level meter, a lump or a floating substance of bubbles that reflects the sound waves or ultrasonic waves emitted by the sonic level meter. Since the liquid is removed from the liquid surface, the level change of the liquid surface can always be detected accurately and the suspended matter on the liquid surface can be absorbed very efficiently.

[0008]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a front view showing an example of a suction device according to the present invention.

In the suction device of this example, a suction port 2 for sucking suspended matter on the liquid surface is provided at the tip of a suction pipe 1 extending from the liquid toward the liquid surface. The suction pipe 1 has a structure in which a flexible pipe 4 connected to a suction pump is connected to the other end side of an elbow type steel pipe 3 having a suction port 2 on one end side. A weight 6 for balancing the weight of the holding weight 5 and the flexible tube 4 is provided. The suction port 2 is opened in the circumferential direction along the liquid surface, and the upper surface of the opening 7 is a guide slope 8 extending conically toward the tip of the suction pipe 1. The opening 7 is about 2
It has an opening height of about 00 mm.

In the figure, 9 is an elevating / lowering device for moving the suction port 2 up and down and holding it at the liquid surface position. The suction head is connected to the rod head 12 of the piston rod 11 which expands and contracts in the vertical direction by the connecting rod 13. The air cylinder 10 supports the air cylinder 2, and the hoist 15 suspends the air cylinder 10 with a chain 14. The air cylinder 10 is provided with a horizontal member 16 extending parallel to the liquid surface, and a sonic level meter 17 and the level meter 1 are provided at the tip of the horizontal member 16.
A shower nozzle 18 that intermittently sprays water toward the liquid level serving as the measurement level surface of No. 7 is provided. The shower nozzle 18 sprays the liquid in the waste liquid storage tank that is pumped by the pump 20 through the flexible hose 19.

Next, reference numeral 21 is a control device for outputting to the hoist 15 a position adjustment signal CH for moving the suction port 2 up and down according to the level change of the liquid level detected by the sound wave level meter 17. Further, the control device 21 controls the suction port 2 for the air cylinder 10 based on the level detection value of the level meter 17.
Control signal C that raises and lowers in small steps with an amplitude of about 20 mm
S is continuously output in a cycle of several seconds. Further, the pump 20 outputs a control signal CP for supplying water to the shower nozzle 18 at intervals of several minutes for several seconds to several tens of seconds. When the control signal CP is output, the level meter 17 changes the level. Is interrupted and the control signal CH is not output.

When the level of the liquid surface changes due to the inflow or outflow of the waste liquid, the change in the level is detected by the sonic level meter 17, and the hoist 15 from the controller 21 is detected.
A position adjustment signal CH corresponding to the level change is output to the hoist 15 based on the signal CH.
4 is wound or unwound by a required length to hold the suction port 2 at the liquid surface position. Therefore, the suction port 2 does not separate from the liquid surface under the influence of the wind wave, and the level meter 17
Since the liquid level is reliably held at the liquid level position following the level change of the liquid level detected in step 1, there is no possibility of inhaling only air or liquid as in the conventional case.

In particular, a level meter 1 utilizing sound waves or ultrasonic waves
7 measures the time required for the sound shockingly emitted from the sound source to reach the surface of the measurement level, reflect and return, and the fact that this required time is proportional to the level is used for measurement. However, the reflectance of sound with the liquid is almost 100%, and the level detection accuracy of the liquid surface is extremely high. Moreover, from the control device 21 to the pump 20 at intervals of several minutes.
A control signal CP for operating the shower head 18 is output, and the shower nozzle 18 intermittently sprays water toward the liquid level serving as the measurement level surface of the level meter 17 to collect sound waves or ultrasonic waves from the liquid surface. Since the suspended matter is excluded, the level change can be accurately detected. In other words, when the waste paint is dropped into the waste liquid storage tank, a large amount of bubbles are generated on the liquid surface due to the action of the killer agent added to make the paint components in the waste paint non-tacky, and the bubbles become high. It can grow into a large lump reaching up to 50 mm, which is a sound level meter 1
When it reaches the measurement level surface of 7, the sound emitted from the sound source does not reach the liquid surface, but is reflected by the surface of the bubble and the level change of the liquid surface may be erroneously detected. If you water it intermittently, you don't have to worry about it.

Further, as in the embodiment, when the opening 7 is formed in the circumferential direction over substantially the entire circumference of the suction port 2 and the upper surface of the opening 7 is formed as the conical guide slope 8, the suction port is formed. The liquid sucked into the suction pipe 1 from 2 causes a vortex flow, and the vortex flow sucks the suspended matter on the liquid surface so that the suspended matter is remarkably improved in suction efficiency.
Further, the control device 21 outputs a control signal CS to the air cylinder 10, and the piston rod 11 of the air cylinder 10 is expanded and contracted in a stroke of about 20 mm to hold the suction port 2 at the liquid surface position in small increments. When it is moved, the efficiency of sucking the suspended matter on the liquid surface is further improved, and at the same time, even when the liquid surface is wavy, only the air is not sucked from the suction port 2, and the air is mixed into the liquid like bubbles. Since the suction pipe 1 is sucked in such a state, there is no possibility that the suction pipe 1 is filled with air and the suction pipe 1 floats on the liquid surface.

[0015]

According to the present invention, since the suction port provided at the tip of the suction pipe extending from the liquid toward the liquid surface is securely held at the liquid surface position without being affected by wind waves, At the same time that the efficiency of absorbing suspended solids on the surface is increased, there is no possibility that only the air will be sucked into the suction pipe and the suction pipe will float above the liquid level.The measurement level of the sonic level meter that detects changes in the liquid level Since it blocks the arrival of bubbles and floating substances on the surface, it is very excellent that it can always detect the level change of the liquid level accurately and suck the floating substances on the liquid surface very efficiently. effective.

[Brief description of drawings]

FIG. 1 is a front view showing an example of a suction device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Suction pipe 2 ... Suction port 9 ... Elevating drive device 17 ... Sound wave level meter 18 ... Shower nozzle 21 ... Control device

Claims (1)

[Claims] 1. A device for sucking suspended matter on a liquid surface, wherein a suction port (2) for sucking suspended matter on the liquid surface is provided at the tip of a suction pipe (1) extending from the liquid toward the liquid surface,
An elevation drive device (9) for raising and lowering the suction port (2) to hold it at the liquid surface position, and a sound wave level meter (17) provided integrally with the suction port (2) so as to be vertically movable, And a controller (21) for outputting a position adjustment signal (CH) for moving the suction port (2) up and down according to the level change of the liquid level detected by the level meter (17) to the lifting drive device (9). A shower nozzle (18) that intermittently sprays water toward the liquid level serving as the measurement level surface of the level meter (17) is provided so as to be vertically movable integrally with the level meter (17). A device for sucking suspended matter above the liquid surface.