JP3059834B2 - Suction device for suspended matter above the liquid surface - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for sucking floating substances such as oils and paint residue floating on the liquid level of a storage tank for storing waste liquid and the like.

[0002]

2. Description of the Related Art In a conventional suction device, a suction pipe of a pump is flexibly extended from the liquid in a liquid storage tank toward a liquid surface, and a funnel-shaped suction pipe is provided at a tip of the suction pipe to suck floating substances on the liquid surface. The suction port is generally held at a liquid level by a float that follows a change in the level of the liquid level so that the suspended matter can be sucked in efficiently. No. 47-13215, No. 56-
No. 20074, Japanese Utility Model Laid-Open No. 57-9381,
No. 162093).

[0003]

However, the float floating on the liquid surface is liable to fluctuate under the influence of wind waves, and particularly when the liquid surface generates a large swell due to a strong wind such as a typhoon, the float is greatly inclined left and right or violent. Since the up-and-down movement is repeated, the suction port may protrude upward away from the liquid surface, and a large amount of air alone may be sucked from the suction port without sucking the suspended matter on the liquid surface. Attempts have been made to attach a weight to the suction pipe in order to prevent the suction port from projecting above the liquid surface.However, attaching a weight reduces the float's buoyancy. The mouth may be completely submerged in the liquid, and only the liquid is sucked in without sucking the suspended matter. Therefore, the present invention has a technical problem to ensure that the suction port provided at the tip of the suction pipe does not move up and down and is reliably held at the liquid level even if the liquid level in the liquid storage tank swells. I have.

[0004]

In order to solve this problem, according to the present invention, a suction pipe of a pump is flexibly extended from the liquid in a storage tank toward a liquid surface, and is provided at the tip of the suction pipe. In a suction device for a floating substance above the liquid surface provided with a suction port for the floating substance above the liquid surface, a lifting drive device for raising and lowering the suction port to hold the liquid surface position, and vertically movable integrally with the suction port A sound level meter and a float level meter provided in the apparatus, and a level adjustment signal for raising and lowering the suction port in accordance with a level change of the liquid level detected by the sound level meter is constantly transmitted to the elevation drive device. The float type liquid level gauge is disposed at a position to output a switch signal by receiving the buoyancy of the liquid when the suction port is submerged below the liquid level, and the switch signal is When output is continued for a certain period of time, Only until the output of the pitch signal is stopped, wherein the threshold adjustment signal to increase the blotter mouth to the lifting drive device from the control device is output.

[0005]

According to the present invention, the suction port provided at the tip of the suction pipe is held at the liquid level by the lifting drive device for raising and lowering the suction port. Unlike the case where the liquid is held at the surface position, there is no possibility that the suction port protrudes above the liquid surface or sinks in the liquid due to the undulation generated on the liquid surface. In addition, the lifting drive raises and lowers the suction port according to the level change of the liquid level detected by the sound wave level meter that moves up and down integrally with the suction port, so that the suction port is securely held at the liquid level. can do.

[0006] In the unlikely event that a sudden change in level occurs that cannot be immediately responded to by the elevation driving device, the level meter abnormally approaches the liquid level, and the distance between the two becomes so small that it cannot be measured by the acoustic level meter. If the level adjustment by the level meter becomes impossible and the suction port sinks below the liquid level, the float type liquid level meter that moves up and down integrally with the suction port receives the buoyancy of the liquid and outputs a switch signal, When the output of the switch signal continues for a certain period of time, the lifting drive raises the suction port, so that the distance between the sound level meter and the liquid level returns to within the measurable range of the level meter, and thereafter, the sound level level again The level can be adjusted by a meter, and the suction port is held at the liquid level.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a flow sheet diagram showing an example of a suction device according to the present invention, FIG. 2 is a front view of a suction port provided at the tip of a suction pipe, and FIG. 3 is a side view of the suction port.

In the suction device of this embodiment, the suction pipe 2 of the pump 1 is flexibly extended from the liquid in the storage tank 3 into which the waste liquid of the paint flows, toward the liquid surface. A suction port 4 for sucking suspended matter such as paint residue floating on the liquid surface is provided. In addition, the suction port 4 is formed with an inverted conical guide slope 6 for facilitating the suction of floating substances from above to below the opening 5 having an opening height of about 200 mm. A weight 7 that suppresses swinging is provided at the lower end side to be connected.
Is provided.

In the drawing, reference numeral 8 denotes a lifting drive device for vertically moving the suction port 4 so as to hold the suction port 4 at the liquid level.
A hoist 10 is used to hang the hoist 10 up and down with a chain 9. At the upper end of the suction port 4 suspended by the chain 9, a bracket 11 extending to the left and right is protruded, and the bracket 11 is provided with a sound wave or an ultrasonic wave which is shockedly emitted from a sound wave source in the liquid storage tank 3. Measure the time required to return by reflecting off the surface, and use the sonic buoyancy level type 12 to detect a change in the level of the liquid surface using the fact that the required time is proportional to the level, and the buoyancy of the liquid. A float type liquid level gauge 13 for performing level measurement is provided. The float type liquid level gauge 13 opens the contacts by the load of the float 16 suspended by the chain 15 from the contact block 14 of the switch fixed to the bracket 11, and when the suction port 4 falls below the liquid level. , The float 16 lands on the liquid surface and receives the buoyancy of the liquid, and the chain 15 suspending the float 16
Is loosened, the contact is automatically closed, and the switch signal FS is output.

Reference numeral 17 denotes a control device which constantly outputs a level adjustment signal CP for raising and lowering the suction port 4 to the hoist 10 of the lifting / lowering driving device 8 in accordance with a level change of the liquid level detected by the sound wave level meter 12. And the float type liquid level gauge 1
3 to determine whether or not the switch signal FS has been continuously output for a certain period of time. If the output of the switch signal FS does not continue for more than 5 seconds, for example, the level control signal CP is output to the lifting / lowering driving device 8. If the switch signal FS continues for 5 seconds or more, the level control signal CQ for raising the suction port 4 is output to the lifting drive 8 only until the output of the switch signal FS stops.

The suspended matter on the liquid surface sucked into the suction pipe 2 from the suction port 4 together with the waste liquid in the liquid storage tank 3 is filtered.
The waste liquid from which the suspended solids are separated and recovered from the waste liquid and returned from the waste liquid is returned to the storage tank 3 through the reflux pipe 19 again.

When the level of the liquid in the storage tank 3 changes due to the inflow or outflow of the waste liquid, the change in the level is detected by the sonic level meter 12 and is sent from the control device 17 to the hoist 10 of the lifting drive 8. On the other hand, a level control signal CP for raising and lowering the suction port 4 in accordance with a level change of the liquid level is output, and the chain 9 of the hoist 10 is output based on the signal CP.
Is unwound or wound up by the required length that can hold the suction port 4 at the liquid level. As a result, the suction port 4 is protruded above the liquid surface under the influence of a wave or the like generated on the liquid surface of the liquid storage tank 3 or is completely immersed in the liquid. There is no danger of being sucked.

In particular, the reflectance of sound at the liquid surface is approximately 10
0%, and the level detection accuracy of the liquid level by the sonic level meter 12 is extremely high, so that the suction port 4 can be reliably held at the liquid level position. The suction port 4 has an inverted conical guide slope 6 formed from above to below the opening 5, so that the liquid sucked into the suction pipe 2 from the suction port 4 generates a vortex. Thus, the suspended matter on the liquid surface is absorbed so as to be involved, so that the efficiency of absorbing the suspended matter is remarkably improved.

However, since the sonic level meter 12 has a narrow measurable range, for example, the hoist 1
When the liquid level is large while the chain 0 is unwinding the chain 9, or when a large amount of waste liquid flows into the liquid storage tank 3 and the liquid level suddenly rises, an acoustic wave is generated. The distance between the level meter 12 and the liquid level is so narrow that it cannot be measured, and distance information cannot be obtained from the level meter 12. If this state is left, the control device 17 continues to output the level adjustment signal CP for unwinding the chain 9 of the hoist 10 and lowering the suction port 4, so that the suction port 4 is immersed deeply in the liquid and the suction port 4 From there, there is a possibility that only the liquid is sucked in for a long time without any suspended matter being sucked.

However, in the present invention, when the switch signal FS is output from the float type liquid level gauge 13 when the suction port 4 is submerged below the liquid level, and the switch signal FS is continuously output for a certain period of time, the control is performed. The device 17 outputs a level adjustment signal CQ for hoisting the chain 9 to the hoist 10 of the lifting drive device 8 and raising the suction port 4. When the suction port 4 rises to the liquid level, the switch signal FS is not output from the float type liquid level gauge 13 and the distance between the sonic level meter 12 and the liquid level can be measured by the level meter 12. Since it returns within the range, the control device 1
7 instead of the previous level adjustment signal CQ,
Thereafter, the level adjustment signal CP for raising and lowering the suction port 4 in response to a change in the level of the liquid level detected by the sonic level meter 12 again.
Is output. Thus, there is no danger that the suction port 4 will be immersed in the liquid for a long time and the efficiency of sucking suspended matter will be reduced.

The lifting drive 8 for raising and lowering the suction port 4 is not limited to the hoist 10 but may be a cylinder. In addition, the float type liquid level gauge 13 is not limited to the one that transmits the movement of the float 16 by the chain 15, but may be one that transmits the movement of the float 16 by a steel wire or a lever mechanism.

[0017]

As described above, according to the present invention, the suction port provided at the tip of the suction pipe is held at the liquid surface position without being affected by the swell generated on the liquid surface. Since the suction port can be reliably prevented from sinking below the liquid surface and sucking only the liquid, there is an excellent effect that the efficiency of sucking suspended matter on the liquid surface is significantly improved as compared with the related art.

[Brief description of the drawings]

FIG. 1 is a flow sheet diagram showing an example of a device for sucking suspended matter on a liquid surface according to the present invention.

FIG. 2 is a front view of a suction port provided at a distal end of a suction pipe of the suction device.

FIG. 3 is a side view of a suction port.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Pump 2 ... Suction pipe 3 ... Liquid storage tank 4 ... Suction port 8 ... Elevating drive device 12 ... Sound wave type level meter 13 ... Float type liquid level gauge 17. ..Control device CP: Level adjustment signal CQ: Level adjustment signal FS: Switch signal

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C02F 1/40 B01D 17/00-17/12 B01D 21/24

Claims (1)

(57) [Claims] 1. A suction pipe (2) of a pump (1) is flexibly extended from the liquid in a liquid storage tank (3) toward the liquid surface, and floats on the liquid surface at the tip of the suction pipe (2). In a device for sucking suspended matter on the liquid surface provided with a material suction port (4),
A lifting / lowering drive (8) for raising and lowering the suction port (4) to maintain the suction surface (4) at a liquid level, a sound wave level meter (12) and a float provided integrally and vertically movable with the suction port (4); A liquid level gauge (13) and a level control signal (CP) for raising and lowering the suction port (4) in accordance with a level change of the liquid level detected by the sonic level meter (12). And a control device (17) for constantly outputting the liquid to the float type liquid level gauge (13). The float type liquid level gauge (13) receives the buoyancy of the liquid when the suction port (4) is submerged below the liquid level. The switch signal (FS) is arranged at a position where the switch signal (FS) is output, and when the switch signal (FS) is continuously output for a predetermined time, the switch signal (FS) is output.
A level control signal (CQ) for raising the suction port (4) is output from the control device (17) to the lifting / lowering drive device (8) only until the output stops. For absorbing suspended matter on the liquid surface.