JPH07107196B2 - Circulating rust preventive oil cleaning tank device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a clean tank device for rust-preventing oil (hereinafter referred to as circulating rust-preventing oil) that is circulated for use.

[Prior Art] The rust preventive oil applied to the surface of a cold rolled steel sheet or the like is generally circulated and used by using a clean tank device.

However, since the circulating rust preventive oil that enters the clean tank device contains water or iron, it is necessary to remove water and impurities there before supplying it for reuse. Various studies have been made on a device for cleaning circulating rust preventive oil.

As an example, "Water separator for rust preventive oil" (Shokaisho 61-18)
There is a clean tank device as proposed as Japanese Patent No. 7205). Here, a clean tank device as shown in FIG. 3 is described. The rust preventive oil containing used water and iron powder is sent to the tank 1 and stored in the tank 1. The used rust preventive oil in the tank 1 is sucked by the water separator 5 because the water separator 5 is depressurized, and passes through the conduit, the strainer 2, the heater 3, the solenoid valve 4, the water separator 5 and the filter 8 Will be led to. The used rust-preventing oil is first filtered in a strainer 2 having a 100-mesh filter medium, then heated by a heater 3 to about 50 ° C., and guided to a water separator 5. The water separation device 5 comprises a water separation tank 6 and a vacuum pump 7 for reducing the pressure in the water separation tank 6 to -700 mmHg. The water separation tank 6 has a supply port for rust-preventing oil containing water at its upper part and a discharge port for rust-preventing oil from which water has been separated at its lower part. The supply port is provided with a nozzle 9 for injecting used rust preventive oil into the tank, with the injection port directed downward along the axis of the water separation tank 6. Below the injection port of the nozzle 9,
Between the wall of the water separation tank 6 and a horizontal water separation plate 10 of a predetermined width, for example, made of stainless steel, for receiving the rust preventive oil containing water injected from the injection port and evaporating the contained water. It is provided with a gap. A heater 11 is attached to the lower surface of the water separation plate 10, and the water separation plate 10 is heated to about 50 ° C. by the heater 11. A temperature adjuster is provided below the heater 11 and close to the heater 11. Using such a device, the water content is removed until it becomes 300 ppm or less. Then, the rust-preventive oil from which the water has been removed is guided to the filter 8 by the pump 12,
Fine iron powder is also removed by the 0.5 μm polypropylene furnace material until the content becomes about 6 mg / 100 ml, and thus becomes clean rust preventive oil for reuse.

[Problems to be Solved by the Invention] A clean tank device including a device for separating water in rust preventive oil as described in Japanese Utility Model Publication No. 61-187205 is expected to have some effect, but here Since the rust preventive oil discharged from the tank 1 is sequentially treated by the water separator 5 and the filter 20, there are the following problems.

The content of rust preventive oil mixed with used water and iron powder varies depending on the operating conditions of the rust preventive process and the season (in the case of water). Therefore, it is necessary to install a treatment device capable of sufficiently removing the expected maximum amount in order to obtain a predetermined content in one treatment. In particular, regarding the water content, it is necessary to make the heating means of the water removal device larger than necessary in order to increase the water content due to the rainy season.

Since the tank 1 to which the used rust preventive oil is sent contains water, iron powder, etc., it is apt to precipitate due to the passage of time, which requires frequent cleaning of the tank and is complicated.

The present invention is intended to solve the above-mentioned problems and has a simple structure in which impurities can be removed and moisture can be removed in sequence, a clean rust preventive oil can be stably supplied, and the frequency of tank cleaning can be reduced. An object is to provide a clean tank device.

[Means for Solving the Problems] In order to achieve the above object, the present invention relates to a circulating rust preventive oil cleaning tank device including a rust preventive oil tank main body, a filter device, and a water removing device. The main body is divided into a dirty tank, a semi-clean tank, and a clean tank, and the reverse cascade method is connected, and the dirty tank is connected to the semi-clean tank through a filter device. It is used as a cleaning tank device for circulating rust preventive oil, which is connected to a clean tank via In the present invention, it is preferable in the above that a semi-clean tank or an overflow weir of the clean tank is provided with an inclined plate for connection in an inverse cascade system.

In the present invention, it is necessary to divide the rust preventive oil tank body into a dirty tank, a semi-clean tank, and a clean tank, and connect them in a reverse cascade system. As a result, only the dirty rust preventive oil can be processed in the dirty tank, only the filtered rust preventive oil can be processed in the semi-clean tank, and only the rust preventive oil in which the water has been further removed can be processed in the clean tank. It is possible to stably supply clean rust preventive oil for reuse.

In this case, each tank was connected in the reverse cascade method. Conversely, dirty rust-preventing oil in the dirty tank was diluted with filtered rust-preventing oil that was cleaner than that, and filtered in the semi-clean tank. With respect to the above, by diluting it with a rust preventive oil from which more clean water has been removed, fluctuations due to an increase in water content, impurities, etc. are alleviated, and the filtration processing and water removal processing thereof are facilitated.

If a semi-clean tank or a slant plate is installed in the overflow weir of the clean tank in the reverse cascade connection, the rust preventive oil completely eliminates the bubbles generated by the overflow, and the rust preventive oil oxidizes as a result. It can be prevented.

[Operation] Since the present invention has the above-mentioned configuration, when cleaning the rust preventive oil using this clean tank device, the rust preventive oil overflows between the dirty tank, the semi-clean tank and the clean tank by the reverse cascade method. While feeding, dirty anti-corrosion oil (hereinafter referred to as anti-corrosion oil) was fed into the dirty tank, where it was diluted with anti-corrosion oil filtered due to overflow (hereinafter referred to as filtered anti-corrosion oil), and then diluted. Filtered rust preventive oil can be filtered, and in a semi-clean tank, filtered rust preventive oil is removed by overflow to remove water (hereinafter referred to as filtered water rust preventive oil). And the filtered anticorrosion oil diluted can be subjected to water removal treatment. Then, the rustproof oil purified from the clean tank is supplied for reuse.

[Examples] Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the present invention. In the figure, 21 is an antirust oil tank main body, 22 is a dirty tank, 23 is a semi-clean tank, 24 is a clean tank, 25 is a filter device, and 26 is a water removing device.

The circulating rust preventive oil cleaning tank device of the present invention is divided into rust preventive oil tank main bodies 21 by partition walls 27a, 27b to form a dirty tank 22, a semi-clean tank 23, and a clean tank 24. The tank is connected to the reverse cascade system, and the dirty tank 22 is connected to the semi-clean tank 23 through the filter device 25, and further, the semi-clean tank 23 is connected to the clean tank 24 through the water removing device 26. It is a thing.

The rustproof oil tank body 21 is divided into a dirty tank 22, a semi-clean tank 23, and a clean tank 24.
22 can process only antifouling rust oil, semi-clean tank 23 can process only filtered rust oil, and clean tank 24 can process only rust oil that has further removed water. In order to filter the dirty antirust oil, the conduit 31a arranged in the dirty tank 22 is connected to the filter device 25, and the conduit 31b is arranged from the filter device 25 to the semi-clean tank 23. Further, in order to remove moisture from the filtered rust preventive oil, the conduit 31c disposed in the semi-clean tank 23 is provided with a moisture removing device 26
Connected to the water removal device 26 to the clean tank 24 conduit 31d
Are arranged.

On the other hand, since the dirty tank 22, semi-clean tank 23, and clean tank 24 are connected in the reverse cascade method, dirty rust-proof oil in the dirty tank is diluted with filtered anti-rust oil that is cleaner than that due to overflow. However, the filtered anticorrosion oil in the semi-clean tank is diluted with the anticorrosion oil that has purified water removed from that caused by overflow, and fluctuations due to increase in water content and impurities are alleviated, and the filtration processing is performed. Therefore, the water removal process can be facilitated. The arrow indicates the flow direction due to overflow.

In the present invention, the circulating rust preventive oil cleaning tank device is smoothly cleaned in a normal state, and the predetermined cleaned rust preventive oil can be supplied for reuse.

In order to continuously perform rust prevention in the rust prevention process of the cold-rolled steel sheet, in the circulating rust preventive oil cleaning tank device of the present invention, continuously cleaned rust preventive oil is continuously supplied from the conduit 36. Therefore, level meters 29a, 29b, and 29c are installed in each tank so that the cleaning process can be performed normally. I am trying. When the level of the rust preventive oil in the dirty tank drops to the warning level, the valve provided in the pipe 35 of the new rust preventive oil tank 33 is opened to supply the insufficient rust preventive surface. Further, when the level of the rust preventive oil in the semi-clean tank 23 is lowered to a warning level, processing such as switching the filter devices 25 in two series is performed. Clean tank
Although the drop in the level of the rust preventive oil in 24 is extremely rare, when the warning level is reached, in this case, the bypass conduit shown by the dashed line
32b is opened, the semi-clean tank 23 is connected, emergency treatment is performed, and rust preventive oil is supplied for reuse. 32a
The same is true for.

FIG. 2 is a diagram showing another embodiment of the main part of the present invention. In the figure, 28a and 28b indicate inclined plates. Sloping plates 28a and 28b are provided on the overflow weirs formed by the partition plates 27a and 27b of the rust preventive oil tank main body 21 in the clean tank device of the present invention. By providing the inclined plate on the overflow weir, it is possible to completely eliminate the bubbles generated by the overflow and prevent the oxidation of the rust preventive oil caused by the bubbles.

Here, the tips of the inclined plates 28a and 28b are dirty tanks.
22. It is necessary to be immersed in the rust preventive oil in the semi-clean tank 23. If the tip is exposed, bubbles may be generated and oxidize the rust preventive oil. The angle of the inclined plates 28a, 28b must be appropriately determined according to the flow rate of the essential oil, etc., but in any case, the overflowed rust preventive oil should flow on the inclined plates 28a, 28b. is necessary.

Next, the operation in the case of using the circulating rust preventive oil cleaning tank device shown in FIGS. 1 and 2 of the present invention in the rust preventive process of the cold rolled steel sheet will be described.

When cleaning anti-rust oil using this clean tank device, dirty anti-rust oil is transferred to the dirty tank while overflowing the anti-rust oil by the reverse cascade method between the dirty tank, semi-clean tank and clean tank. It can be sent through a conduit 34 and diluted there with filtered rust preventive oil due to overflow, and the diluted dirty rust preventive oil can be filtered, and in a semi-clean tank, the filtered rust preventive oil overflows. It is possible to dilute the filtered rust preventive oil from which water has been removed, and to subject the diluted filtered rust preventive oil to water removal treatment. Then, the rustproof oil purified from the clean tank is supplied for reuse.

In the above, the size of the dirty tank, the semi-clean tank, and the clean tank was 500 volumes each, and rust-preventing oil was circulated at a rate of 6 / min for cleaning, and the cleaned rust-preventing oil was cold-rolled. The steel sheet was oiled. In this case, the content of iron powder etc. of the cleaned rust preventive oil is removed to 6 mg / 100 ml or less,
The water content was reduced to 300 ppm or less. In this case, in the present invention, there is not much space to clean because it is only the dirty tank, and the dirty tank is agitated by the flow due to overflow of rust preventive oil, suction, and the flow due to reception,
Since iron powder etc. does not easily settle, the frequency of cleaning with the rust preventive oil tank main body stopped is extremely low.

[Effects of the Invention] According to the present invention, the rust preventive oil tank main body is divided into a dirty tank, a semi-clean tank, and a clean tank, and a simple structure of connecting them in a reverse cascade method,
By removing impurities and water in sequence, clean rust preventive oil can be stably supplied, and the frequency of cleaning the rust preventive oil tank body can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of the present invention, FIG. 2 is a partially cutaway perspective view showing another embodiment of the main part of the present invention, and FIG. 3 is a conventional circulating rust preventive oil cleaning tank device. It is a figure which shows an example. 21 ... Rust preventive oil tank body, 22 ... Dirty tank, 23 ... Semi-clean tank, 24 ... Clean tank, 25 ... Filter device, 26 ... Water removing device, 27a, 27b ... Partition plate, 28a, 28b …… Sloping plate.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location B01D 17/04 501 D 502 A 17/12 Z B05C 11/10

Claims (2)

[Claims] 1. A clean tank device for circulating rust preventive oil, comprising a rust preventive oil tank body, a filter device, and a water removing device, wherein the rust preventive oil tank body is divided into a dirty tank, a semi-clean tank, and a clean tank. Circulation anticorrosion characterized by being connected to the reverse cascade system and piping from the dirty tank to the semi-clean tank through the filter device and from the semi-clean tank to the clean tank through the water removal device. Oil cleaning tank device. 2. The clean tank device for circulating rust preventive oil as claimed in claim 1, wherein a semi-clean tank and an overflow weir of the clean tank are provided with inclined plates and connected in a reverse cascade manner.