JPS60210316A - Device for purifying drawing liquid of drawing mill - Google Patents

Abstract

PURPOSE:To obtain a device for purifying the drawing liquid of a drawing mill capable of effectively separating the sludge contained in the drawing liquid by a relatively compact constitution by forming the device so as to purify the drawing liquid of drawing mill by the combination of gravity settling and forced separation by using a cyclone. CONSTITUTION:A sludge-containing drawing liquid sent out from drawing mills A1-A4 through a return-oil circuit 11 is stored in a primary storing tank 15, and heavy sludge is settled and accumulated at its bottom to scrape out it to the outside. A supernatant liquid containing light suspended sludge is fed 3 to a cyclone 14, and the sludge is forcibly separated and concentrated by a centrifugal force and is falled in a secondary storing tank 16 to discharge it, and the purified liquid is sent to a purified liquid tank 17. The tank 17 sets the flow rate of sending water while constantly allowing the small amount of purified water to overflow to the tank 15 side from an overflow weir 22, and the fine sludge suspending on the liquid surface is returned to the tank 15; the purified drawing liquid at the lower part of tank is returned through a return circuit 31 to feed it to each mill A. During this time, a temperature sensor 6 is actuated when the liquid temperature in the tank 17 rises to >= a prescribed temperature, and a cooling means 27 is operated to cool the liquid to the prescribed temperature, or a heater 29 is actuated to heat the liquid to the prescribed temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for purifying wire drawing fluid supplied to a drawing die of a wire drawing machine.

As is well known, wire drawing fluid contains sludge generated during drawing, and if used as is, it may cause defects in the drawn wire.
In addition, there are problems such as shortening the life of the dice, so it is necessary to purify them. For this reason, for example, as shown in FIG. 1, a settling tank 1 is used as a purification means by natural settling of the sludge. In the figure, 2 is a return liquid supply pipe connected to the wire drawing liquid receiving tank (not shown) of the wire drawing machine, 8 is a sludge pump, 4 is a supply pump that sends purified liquid to the wire drawing machine, and 6 is a settling tank l. This is a partition plate installed inside the tank to divert the liquid flow.

When using this purification method, the capacity of the Japanese cypress is limited, and a large installation area is required. Also, the amount of liquid used is large,
When replacing the liquid, it is necessary to dispose of a large amount of waste oil, and there are drawbacks such as high maintenance costs such as oil conversion and tank cleaning costs.

Furthermore, vegetable oil may be mixed into the wire drawing fluid to increase lubricity, and in this case, there is a risk that anaerobic bacteria will develop during long-term use, causing the fluid to rot.

Another method for removing sludge from liquid is a Hoffman conveyor tank, which stirs the liquid in the tank to create bubbles, adsorbs suspended matter to the bubbles, and scrapes out the adsorbed bubbles. However, depending on the type of wire drawing liquid, the foaming property is low or the foaming property is suppressed, so there are problems such as not being as effective as a 70-station and making it difficult to adsorb and remove large sludge.

In view of this, an object of the present invention is to combine natural sedimentation and forced separation using a cyclone to effectively separate and remove sludge in a wire drawing liquid using a relatively small purification device.

A further object of the present invention is to use the above-mentioned cyclone to prevent liquid spoilage through the aeration effect.

Hereinafter, the present invention will be explained in detail based on the implementation numbers shown in FIG. 2 and below.

The figure shows multiple wire drawing machines, for example four wire drawing machines AI and A2.

A8. This shows an example of purifying the wire drawing liquid for A4 (hereinafter generically referred to as simply A) using one purifying device 1o, and FIG. 2 is a schematic explanatory diagram of the operation of the purifying device. The purifying device 1o includes wire drawing liquid receiving tanks a1. of each wire drawing machine At, A2... a2゜as, a4 (hereinafter referred to collectively as simply a)
Return oil circuits 11a, llb, lie connected to

11 (hereinafter simply referred to as 11), a processing tank 18 for storing the wire drawing liquid sent by the return oil circuit 11, and a cyclone 14. A primary storage tank 16, a secondary storage tank 16 with a smaller capacity than the primary storage tank 16, and a purification liquid tank 17.
The primary storage tank 16 and the secondary storage tank 16 are separated by a partition wall 18 with an open rear part, and a scraper (rubber-lined) for scraping out sludge is installed at the bottom of both tanks 16 and 16, respectively, and a conveyor 20. 20' has been installed. Further, the septic liquid tank 17 is divided from the primary and secondary storage tanks 15 and 16 by a partition 21, and an overflow area 22 is formed in the partition 21 from the septic liquid tank 17 to the primary storage tank 16. There is. A balance plate 22a is installed at a suitable location in the middle of the weir, and if the pump 28 fails, the liquid portions of the primary and secondary storage tanks 115 and 16 will become high and the liquid will flow to the clarification liquid tank 1 due to water pressure.
7. However, during normal operation, the water pressure in the purification liquid tank 17 is high, so the balance plate 22a is closed and communication with the primary and secondary storage tanks 15 and 16 is cut off.

22b is an overflow part installed at a suitable position above the tank to prevent the liquid from overflowing from the top surface of the tank when the overall liquid level of the processing tank 16.16-17 rises.This overflow part 22b
The liquid should be guided to the outside of the processing tank.

The cyclone 14 is disposed on a secondary storage tank 16, and the supernatant liquid of the primary storage tank 16 is fed into the cyclone 14 via a supply pipe 24 by a supply pump 28. As shown in FIG. 4, the cyclone 14 is preferably a plurality of cyclones (for example, 12 multicyclones in 8 groups, 4 in series) depending on the amount of liquid to be treated, and the composite cyclone 14 includes a high pressure distribution manifold 14a and a plurality of cyclones. It is mainly composed of a cyclone body 14b and a low-pressure collecting manifold 140 (however, FIG. 2 shows it as a single cyclone 14). The purified liquid separated from the sludge by this cyclone 14 is led to the purified liquid tank 17 via the discharge pipe 25, while the separated and concentrated sludge containing a small amount of waste liquid is sent to the lower discharge port X+Z (first (Fig.) is discharged to the secondary storage tank 16.

The purification liquid tank 17 is equipped with a temperature sensor 26, a cooling means 27, and a heater 29 for peace of mind. Purification liquid tank 17
The liquid temperature is detected by a temperature sensor 26 installed in the tank, and when the liquid temperature is high, the liquid is cooled via a heat exchanger 60 to lower the liquid temperature.

In addition, when restarting the purification equipment after a long suspension of operation due to a holiday break in winter, if the liquid temperature is below a certain temperature, product defects may occur, so the heating heater 29 is used to heat the liquid to a certain temperature. A temperature control device shall be provided.

The cooling means 27 includes a cooling liquid delivery pump 28 of a known structure, a heat exchanger 5o, a cooling tower 51, and a cooling water circulation pump 6.
2, piping 68, and switching valve 54. The purified wire drawing liquid, which has been cooled or heated to a predetermined temperature, is returned to a return circuit 81 by sending pumps 80a, 80b, 80c, and 80d (hereinafter collectively referred to simply as 80).
a, 81b, 81c, and 81d (hereinafter collectively referred to as simply 81) to the respective wire drawing machines A 1 , A2.
...is supplied to...

In the figure, H is a sludge transport vehicle that stores and conveys the sludge scraped out by the scraping conveyor 20.

In the above configuration, the wire drawing liquid containing sludge sent out via the return oil circuit 11 is stored in the primary storage tank 16, and the heavy sludge settles and accumulates in the lower part, and is scraped out to the outside by the scraping conveyor 20. Served. The supernatant liquid containing light suspended sludge is sent to the cyclone 14 by the supply pump 28, and in the cyclone 14, the sludge is forcibly separated and concentrated from the liquid by centrifugal force, and is discharged from the outlet 148 at the bottom of the cyclone along with a small amount of waste liquid. Second storage tank 1
6, and the filtered purification liquid is sent into the purification liquid tank 17 from the outlet 14d (FIG. 6) of the Suitaron 14 via the discharge pipe 26.

The amount of water supplied to the clarification liquid tank 17 is set so that a small amount automatically flows from the overflow weir 22 to the primary storage tank 15 side, and the minute sludge floating on the liquid surface is returned to the primary storage tank 15. The purified wire drawing liquid in the lower part is passed through a return circuit 81 by a delivery pump 80 to each drawing 1liI! Supplied to machine A.

In this case, when the temperature of the liquid in the purification liquid tank 17 exceeds a predetermined value, the temperature sensor 26 is activated and the cooling means 27 is operated.
It is cooled to a predetermined temperature, or the heating heater 29 is activated and heated to a predetermined temperature.

Although the secondary storage tank 16 has a smaller capacity than the primary storage tank 15, the amount of liquid supplied is small, so sufficient residence time is obtained for the sludge to settle, and the sludge concentration in the tank 16 is high. It is possible to improve the flocculating property, and it is possible to enhance the effect of so-called flocculation and sedimentation.

Further, the cyclone 14 has a lower discharge port 14111 opened to produce an air suction action accompanying the cyclone action, and mixing of liquid and air, that is, an aeration action is performed within the cyclone 14.

The wire drawing fluid is sometimes mixed with vegetable oil etc. to increase lubricity, which may generate anaerobic bacteria during use and lead to spoilage of the fluid, but the aerobic action described above kills the anaerobic bacteria. effect is obtained, and therefore the life of the liquid can be extended.

As described above, according to the present invention, sludge is separated by natural sedimentation in the primary storage tank, forced separation by a cyclone, and coagulation sedimentation of the concentrated waste liquid in the secondary storage tank. Sludge can be effectively separated from the wire drawing liquid using a small treatment tank.

In addition, by separating the sludge, the decrease in the amount of copper ions and the increase in the amount of aging substances are suppressed, preventing the deterioration of the liquid and extending the life of the liquid.In addition, the wear of the drawing die is reduced, resulting in fewer scratches on the product. This has the effect of eliminating line breakage.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional diagram of a settling tank as a conventional purification device.
Figures 2 to 5 show embodiments of the present invention, Figure 2 is a schematic explanatory diagram of the operation of the purification device, Figure tJs is a partially cutaway plan view of the treatment tank, and Figure 4 is a partially cutaway treatment tank. A front view of the tank, and FIG. 5 is a longitudinal sectional view of the cyclone. 1001. Purification device 111. , return oil circuit 1B 11. Processing tank 14, 0. Cyclone 150. , primary storage tank 1600. Secondary storage tank 171. , septic tank 200. , scraping conveyor A1. A2. AB, A41. wire drawing machine

Claims (1)

[Claims] The first processing tank is installed in the wire drawing liquid receiving tank installed in the Shinaiii machine.
opening a return oil circuit that communicates with a secondary storage tank; the treatment tank includes the primary storage tank, the secondary storage tank, and a clarification liquid tank;
A sludge scraping conveyor is provided at the bottom of the primary and secondary storage tanks, and a cyclone is installed above the secondary storage tank, and the cyclone is supplied with the supernatant liquid from the primary storage tank. A wire drawing liquid purifying device for a wire drawing machine, characterized in that the wire is discharged into a secondary storage tank.