JPH0557329A - Device for recovering floated up scum - Google Patents

Abstract

PURPOSE:To provide a device, by which floated-up and separated scum of rolling oil, etc., already used in cold rolling mill and cleaning line for iron-making can be sucked and removed under unmanned condition. CONSTITUTION:A special suction hole 5 fitted to the specific suction pipe 4 is made to always position in the floated up and separated scum 2 with a float and a counter weight 13, and the bubble is ejected from long hole of the special suction hole. The scum can be removed under unmanned condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for recovering floating scum generated in rolling lubricating oil, electrolytic cleaning liquid, etc., which is a liquid used in cold tandem mills and strip cleaning lines.

[0002]

2. Description of the Related Art When floating up on the liquid surface of a recovery pit and collecting scum, the used rolling lubricating oil is temporarily received in the receiving pit and left standing for a certain period of time, and then the rolling lubricating oil is heated by steam to scum. After the levitation was separated, water was replenished and the levitation scum overflowed and guided to the gutter, and the gutter was thrown into the scum pit using a scraping plate manually. On the other hand, JP-A-2-
Although a floating scum collecting device provided with a suction with a float is proposed in Japanese Patent No. 14702, as for the structure of the suction port, since no special structural consideration is proposed in the above publication, it is recommended for steelmaking. It is difficult to apply to a device for recovering a viscous and air bubble-containing floating scum containing an iron-soap compound in a used rolling lubricant of a cold tandem mill.

[0003]

However, according to the above-mentioned work, since the work by the worker cannot be avoided, high heat-
There is a problem that work in a humid environment cannot be avoided. The present invention has been made in view of such circumstances, and an object of the present invention is to provide an apparatus capable of unmanned floating scum collection work.

[0004]

A levitating scum collecting device according to the present invention rotatably connects a suction pipe that floats above the liquid surface of a collection pit and collects scum, a suction pipe with a float, and a suction pipe. It is characterized by comprising a rotary joint, a pumping device including a pump and a motor connected to the rotary joint by a pipe, and a discharge pipe including a pipe connected to the pump.

[0005]

[Operation] The used rolling lubricant is sent to the receiving pit and left to stand, and the scum floats and separates. The floating scum of used rolling lubricant in a cold tandem mill for steelmaking has a large amount of air bubbles and is extremely viscous. This is sucked by a powerful suction pump, and the bubbles are destroyed in the special suction port to expel the air of the bubbles from the air vent hole provided in the special suction port to prevent air locking of the suction pump and by the float and counterweight. By adjusting the special suction port to the level of the floated and separated scum layer, scum is discharged at a high content rate.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A levitating scum collecting device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is an explanatory diagram showing a vertical section of a receiving pit for used rolling lubricant. FIG. 2 is an explanatory view showing a plane of a receiving pit for used rolling lubricating oil. In the figure, 1 is the main body of the receiving pit. 2 is the surfaced scum. 12 is a used rolling lubricant. 3 is a float. 4 is a special suction tube. 5 is a special suction port. 6 is a swivel joint. Reference numeral 7 is a suction tube steady rest guide. Reference numeral 8 is an inlet side pipe of the scum suction pump 9. 10
Is a scum discharge pipe. Reference numeral 11 is a pipe for receiving used rolling lubricating oil. 13 is a counterweight.

The used rolling lubricating oil is sent to the receiving pit 1 through the receiving pipe 11. The rolling lubricating oil is sent to the receiving pit 1 and left standing, and the scum floats and separates. This is because the scum of the cold tandem mill for iron making has a bulk specific gravity of 0.91 and the rolling lubricating oil has a bulk specific gravity of 0.98, so that the scum floats above the rolling lubricating oil. The floating and separated scum layer 2 of the used rolling lubricant of the cold tandem mill for steelmaking is extremely viscous and contains a large amount of bubbles. This is sucked by the powerful suction pump 9 and the bubbles are destroyed in the special suction port 5 to expel the air of the bubbles from the air vent holes provided in the special suction port 5 to prevent the air pumping of the suction pump 9. .. If the special suction port 5 having such a function is not provided, the suction pump 9 often causes air locking and a water hammer phenomenon, and the suction pump 9 is damaged.

By adjusting the special suction port 5 to the level of the floated and separated scum layer 2 by the float 3 and the counterweight 13, the scum is discharged at a high content rate. The special suction port 5 and the special suction pipe 4 are rotatably connected to the inlet side pipe 8 of the scum suction pump 9 via a swivel joint 6, and guided by a suction pipe steady rest guide 7 to smoothly move up and down. Rotate.

FIG. 3 is an enlarged explanatory view of the special suction port 5 and the special suction pipe 4 as viewed from the side. FIG. 4 is a development view of the outer cylinder steel plate of the special suction port 5.

According to the present invention, the special suction port 5 is automatically
It is possible to collect the scum unattended by adjusting the level of the scum layer 2 that has been floated and separated, and expelling the air of bubbles in the scum layer 2.

[0011]

As described above, according to the present invention, it is possible to avoid the scum scraping work by human power by the scraping rod in a hot and humid environment. Further, since the level control can be accurately performed, the scum is discharged at a high content rate, so that the recovery rate of the rolling lubricating oil is improved.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a vertical cross section of a receiving pit.

FIG. 2 is an explanatory view showing a plane of a receiving pit.

FIG. 3 is an enlarged explanatory view of a special suction port and a special suction tube as viewed from a side surface.

FIG. 4 is a development view of an outer cylinder steel plate of a special suction port 5.

[Explanation of symbols]

 1 receiving pit 2 scum 3 float 4 special suction pipe 5 special suction port 6 swivel joint 7 suction pipe steady rest guide 8 inlet side pipe 9 scum suction pump 10 scum discharge pipe 11 rolling pipe for receiving lubricating oil 12 used rolling lubricant 13 counterweight

Claims (1)

[Claims] 1. A suction pipe that floats on the liquid surface of a recovery pit and collects scum, a suction pipe with a float, a rotary joint that rotatably connects the suction pipe, and a pump that connects the rotary joint by piping. A flotation scum recovery device comprising a pumping device including a motor and a discharge pipe including a pipe connected to the pumping device.