JPH081038A - Oil cleaning method and device therefor - Google Patents

Abstract

PURPOSE:To improve the efficiency in separating stuck oil and the dischargeability of fine contaminant by introducing a contaminated oil into a cleaning tank, moving an endless band to attract the fine contaminant on a magnet on a stainless steel sheet, discharging the contaminant from the cleaning tank and separating the attracted fine contaminant from stuck oil to remove the oil. CONSTITUTION:A contaminated oil 6 is introduced into a cleaning tank 1 through a hopper 4, and the liq. level is detected by a level gage 20 to confirm that the cleaning level is reached. An endless roller chain 2 is then moved to attract fine contaminant 60 on the stainless steel sheet 13 having many permanent magnets 3 arranged to the roller chain 2, and the contaminant 60 is discharged at an angle of 30-60 deg. and removed by a scraper 15 furnished close to a head pulley 8. The contaminant 60 is dropped into a container basket 17, and the waste oil is separated and recovered in the cleaning tank 1 from an outlet hole 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to purification of contaminated oil used as a processing lubricant or a coolant in machining equipment such as various grinders and honing machines, and more specifically, contaminated oil. And apparatus for purifying oil by aggregating and removing fine particulate contaminants such as water, magnetic metallic substances, inorganic substances, or oxides of oil, which are contained in, by the magnetic field action of a magnet disposed in a purifying tank It is about.

[0002]

2. Description of the Related Art Conventionally, for example, various grinding machines and rolling machines,
In machining equipment such as honing machines and shaving machines, lubricating oils and cooling oils are used, and these oils are circulated and used, but in these oils, metal powder generated during processing and cooling Contaminants such as water, minerals, and oxides of oil are often mixed in. If they are used as they are, the lubrication function and the cooling function are remarkably deteriorated, which causes a failure of the machine or deterioration of the function. Therefore, when these contaminated lubricating oils or cooling oils (contaminated oils) are used in circulation, it is necessary to remove the contaminants in the contaminated oils. As a method of removing the contaminants in the contaminated oil, a method of introducing the contaminated oil into a purification treatment tank provided in a circulation system and allowing it to settle to spontaneously sink water and contaminants to purify the oil has long been known. There is.

Recently, a method of increasing purification efficiency while rotating magnetism has also been adopted. For example, as shown in FIG. 3, the return oil b containing the minute contaminant a is introduced into the dirty chamber c by the return oil introduction pipe p, and overflows into the processing tank e defined by the separator wall d. Magnet f
Is provided on the peripheral surface of the rotary roll g, and the oil is purified by an oil purifying device consisting of an oil squeezing roll h which is in contact with the rotary roll and a scraper i whose tip is in contact with the outer surface of the magnet of the rotary roll. 2. Description of the Related Art There is known an oil purifying apparatus configured to overflow a separator wall j to a main tank k and scrape a minute contaminant a adhering to the outer surface of a magnet with a scraper i and discharge the minute contaminant a to the outside of a treatment tank e. In this oil purification device, when removing minute contaminants adhering to the rotating roll (magnet), the adhered oil is also taken out at the same time, so the magnet is applied to the squeeze roll before removing the attached contaminants. The oil thus collected flows backward along the surface of the squeezing roll and returns to the processing tank for recovery. However, when squeezing with a squeeze roll, it also squeezes even a portion of the minute contaminants adsorbed on the magnet, and the oil containing this minute contaminants flows back into the septic tank, recontaminating the purified oil. ,
There is a problem that the purification efficiency decreases. Further, since the rotating roll having the magnet on the peripheral surface is immersed in a relatively shallow region from the oil surface of the septic tank, the contact with the contaminated oil is not sufficient, and it cannot be said that the purification efficiency is sufficient.

[0004]

DISCLOSURE OF THE INVENTION According to the present invention, contaminated oil such as lubricating oil and cooling oil containing fine water droplets and minute contaminants is introduced into a purification treatment tank, and a large number of endless strips are arranged in the purification treatment tank. Due to the magnetic field action of the magnets installed, the micro contaminants in the lubricating oil and cooling oil are adsorbed and removed, and when the micro contaminants are carried out of the purification treatment tank to be separated and removed. (EN) An oil purification method and an oil purification device capable of improving the separation efficiency of adhering oil adhering to minute contaminants adsorbed on a magnet and also improving the carry-out property of adsorbed minute contaminants.

[0005]

According to a first aspect of the present invention, an endless belt having a large number of magnets is movably disposed in a purification treatment tank for introducing contaminated oil, and contamination is caused in the purification treatment tank. In the oil purification method of introducing oil, adsorbing minute contaminants in contaminated oil to the magnet and moving the endless belt, separating and removing the minute contaminants from the magnet outside the purification tank, the magnetism generation A stainless plate is provided on the side so that minute contaminants can be adsorbed through the stainless plate, and a hopper with a contaminated oil introduction pipe connected to the inside of the purification tank has a lower end opening in the upper loop of an endless belt. It is placed close to the surface of the stainless steel plate, the contaminated oil is introduced into the purification treatment tank through this hopper, and the endless belt is moved to adsorb the minute contaminants to the stainless steel plate of the magnet to remove it from the purification treatment tank. Carry out at an angle of 30 to 90 degrees and suck Oil purification method, characterized in that the microcalcifications contaminants and adhering oil is separated and removed. According to a second aspect of the present invention, in the first aspect, the endless belt is moved intermittently by repeating stationary / moving in units of 5 to 30 minutes, and the magnet adsorbing the minute contaminants is at an angle of 30 to 90 degrees from the purification treatment tank. A method for purifying oil, which is characterized by carrying out and separating / removing adsorbed fine contaminants and adhering oil. A third aspect of the present invention is that a purification treatment tank having a hopper to which a contaminated oil introduction pipe is connected and a purified oil discharge portion, an inclined transfer chamber continuous with the purification treatment tank, and a head pulley installed above the inclined transfer chamber. And a large number of magnets whose magnetic side is covered with a stainless steel plate are arranged, and the head pulley is turned through the inclined transfer chamber at an elevation angle of 30 to 90 degrees from the purification treatment tank to the purification treatment tank. An oil purifying apparatus comprising: a circulating endless belt, a magnet cleaner disposed near the head pulley, and a facility for collecting minute contaminants disposed below the cleaner.

[0006]

In the present invention, the magnets provided around the endless belt are covered with the stainless steel plate, and the minute contaminants are attached to the stainless steel cover. Therefore, it is easy to separate them with a cleaner. Further, since the lower opening of the hopper is located in the purification treatment tank close to the surface of the stainless plate of the magnet that moves in the purification treatment tank, minute contaminants in the contaminated oil are outside the lower opening region of this hopper. Can be suppressed (can be introduced in a concentrated manner in the action area of the magnet), and the adsorption efficiency of the minute contaminants by the magnet can be increased.

Further, since the carry-out angle of the endless belt from the purification treatment tank is set to a steep slope of 30 to 90 degrees, the oil attached to the endless belt including the magnet is separated and dropped at the time of carrying out from the purification treatment tank. It is possible to improve the purification efficiency and improve the oil recovery efficiency, and it is possible to more easily remove minute contaminants with a cleaner.

Further, when the movement of the endless belt is intermittently moved, the magnet can be stopped to more sufficiently adsorb the minute contaminants to the magnet, and when it is carried out from the purification treatment tank, this It is also possible to give a starting impact to the endless belt, and in combination with the steep gradient effect, promote the separation and dropping of the oil adhering to the endless belt including the magnet, and improve the purification efficiency and the oil recovery efficiency. it can.

In the present invention, when the endless belt is moved intermittently, it is desirable that the stationary time is in the unit of 5 to 30 minutes. If it is 5 minutes or less, it is difficult to sufficiently adsorb the minute contaminants to the magnet, and even if it is left stationary for 30 minutes or more, the effect of adsorbing the minute contaminants to the magnet does not change, and the stationary time becomes longer and the purification treatment capacity decreases It is not preferable. In this case, the moving speed of the endless belt is about 100 to 200 mm / min, but in order to sufficiently adsorb the minute contaminants by the magnet or when the endless belt is continuously moved, It is also considered that the moving speed of the body is set to a low speed range or that the cleaning time is lengthened (for example, the endless belt is rotated several times in the cleaning tank).

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS. 1 (a) and 1 (b) together with an example of an embodiment thereof. This example shows an example in which the present invention is used for purifying return oil (contaminated oil) used for cutting. In FIG. 1, 1 is a purification treatment tank, inside which a roller chain 2 is movably arranged as an endless belt. On this roller chain, a large number of permanent magnets 3 are detachably arranged at substantially equal intervals.

A hopper 4 is disposed above the upper loop 2a of the roller chain 2 moving in the purification treatment tank 1, and the lower open end 4a of the hopper is close to the upper loop 2a of the roller chain. Therefore, the diffusion of the contaminated oil 6 from the contaminated oil introduction pipe 5 is suppressed, and the adsorption efficiency of the minute contaminant 6o in the contaminated oil with respect to the permanent magnet 3 is increased.

The roller chain 2 is provided between a head pulley 8 driven by a drive device 7 provided above an inclined transfer chamber 11 connected to the purification treatment tank 1 and a support end 9 provided on the inner wall of the purification treatment tank. , Is supported by the guide rail 10 and moves endlessly. The angle θ at which the roller chain 2 is unloaded from the septic tank 1 and moves in the inclined transfer chamber 11.
Has a steep gradient of 30 to 90 degrees to make the oil removed well.

As shown in FIG. 2 (d), one or more permanent magnets 3 are incorporated in a case 3a made of stainless steel so as to generate magnetism on one side of the case (both sides may be used). The case is detachably attached to the frame 2f of the roller chain 2 by the fixed links 12 at both ends of the case. Further, a stainless plate 13 is provided on the magnetic generation side of the permanent magnet 3 in order to facilitate the removal of adhered minute contaminants by a cleaner such as a scraper described later.

The roller chain 2 is installed in the oil purifying tank 5 in order to sufficiently adsorb the minute contaminants by the permanent magnet 3.
-Move intermittently every 30 minutes to maintain a stationary state. The control for alternately moving and stopping the roller chain 2 can be performed by controlling the drive device 7 of the head pulley 8 via a drive control device (timer or the like) 14. At the time of starting the roller chain 2, the upper loop 2a of the roller chain 2 is affected by the starting impact.
When the oil is moved to the outside of the purification treatment tank 1, the adhered oil can be promoted in combination with the above-mentioned steep gradient effect to separate and drop the oil.

A magnet cleaner capable of removing minute contaminants adsorbed on the surface of the permanent magnet 3 (the surface of the stainless steel plate 13) in the moving path of the stainless steel plate 13 of the permanent magnet 3 near the head pulley 8 even during movement. As a scraper 15, a drop chute 16 for the minute contaminants 6o scraped off by the scraper is provided below the scraper 15, and a cage 17 for accommodating the minute contaminants is detachably arranged below the chute. Has been done. This storage basket 17
An oil outflow hole 18 is provided at the bottom of the oil, and the residual oil from the minute contaminants 6o passes through this outflow hole and passes through the purified oil 6c.
Will be collected and reused together. Reference numeral 19 in the figure denotes a purified oil outlet pipe for supplying the purified oil 6c from the purification treatment tank 1 to a main tank (not shown).

In the oil purifying apparatus of the present invention having the above-mentioned structure, when purifying contaminated oil containing water and minute contaminants, the contaminated oil 6o once collected in the collecting tank (not shown) is used. Using a pump (not shown), the contaminated oil was introduced into the purification treatment tank 1 through the hopper 4 by the pipe 5, and the liquid level was detected by the level meter 20 to confirm that the purification treatment level was reached. After that, the roller chain 2 is moved endlessly (intermittently or continuously), and the stainless steel plates 13 of the many permanent magnets 3 arranged on the roller chain 2 adsorb the minute contaminants 6o to the outside of the purification treatment tank. Scraper 17 provided near the head pulley 8 located at
And the minute contaminants 6o adsorbed on the surface of the stainless plate 13 of the permanent magnet 3 are removed. The microcontaminants 6o removed here fall into the storage basket 17 through the chute 16, and the residual oil adhering to the microcontaminants 6o is separated here, and is passed through the outflow holes 18 to the purification treatment tank 1. Be recovered.

In the figure, 21 is a discharge pipe for discharging separated water and drain, 22 is an oil purity meter, and the moving conditions of the roller chain 2 can be controlled based on the oil purity information from this oil purity meter. . For example, it is possible to automatically control the oil purification process by using an arithmetic control device, a drive control device and the like, and interlocking the level meter 20, the oil purity meter 22 and the like.

As described above, in this embodiment, the permanent magnet 3 is used.
Are arranged on the roller chain 2 and moved endlessly so that the stainless steel plate 13 of the permanent magnet 3 adsorbs the minute contaminants 6o, and the oil is removed by the steep slope effect in the inclined transport chamber. Since it is easier to remove the minute contaminants with the scraper 15, the function of the magnet is not deteriorated, and the magnetic field acts effectively for a long time.
The adsorbability of the permanent magnet 3 is maintained over a wide area for a long time, and the oil purification can be made efficient.

Further, as shown in FIG. 3, the inclined transfer chamber 11
A rubber squeeze roll 24, which is supported by the pillow block 23 near the passage of the surface of the stainless steel plate 13 of the permanent magnet 3 passing therethrough, contacts the stainless steel plate 13 and rotates by its movement, is provided. The effect of removing the oil adhering to the plate 13 is expected to some extent, but the effect of disposing the squeezing roll is not remarkable when the conveying angle is 30 degrees or more.

It should be noted that the present invention is not limited to this embodiment, but the purification treatment tank conditions, the endless belt and magnet conditions, the movement conditions of the belt (intermittent and continuous movement conditions), the purification treatment conditions. Etc. are appropriately selected and set within the range satisfying the claims of the present invention according to the purification treatment target, the type of contaminants, the mixed amount, the desired degree of purification, the purification time, and the like.

[0021]

[Specific Example of Treatment] Using the oil purifying apparatus as shown in FIG. 1, the used mechanical cooling oil (contaminated oil) was purified. In this example, the purifying tank has a capacity of 500 liters, and a roller chain 2 having a length of 2.5 m in which 28 single-sided permanent magnets 3 are arranged at substantially equal intervals is arranged. The roller chain 2 is arranged so as to go around the purification treatment tank 1 once. The carry-out angle θ from the purification treatment tank 1 is set to 35 to 85 degrees, the moving speed is set to 200 mm / min, and the continuous movement is performed. Purification processing was performed by intermittent movement. Table 1 shows the execution conditions and the evaluation results.

[0022]

[Table 1]

In all the examples of the present invention, satisfactory results were obtained. That is, when the contaminated oil is introduced into the purification treatment tank 1, the diffusion and flow of the contaminated oil are suppressed by the hopper 4, and the roller chain 2 is brought into a stationary state by intermittent movement, so that the permanent magnet 3 of the minute contaminants is Adsorption (adhesion) to the stainless steel plate 13 was effectively performed.

Further, in the scraper 15, the minute contaminants 6o adsorbed on the stainless steel plate 13 of the permanent magnet are efficiently separated and removed, and the minute contaminants in the oil separated from the dropped oil and the minute contaminants are efficiently removed. The mixing ratio was extremely small, and there was no concern about recontamination of purified oil in the purification tank, and purified oil with high cleanliness was obtained.

When carrying out a steep slope in the inclined transfer chamber, 95% or more of the oil adhering to the permanent magnet 3, the stainless plate 13, the roller chain 2, etc. is purified by the steep slope effect and the starting impact effect during intermittent movement. It can be dropped into the treatment tank 1 and the scraper 15 can easily separate and remove the minute contaminants. In the effect comparison between intermittent movement and continuous movement,
It can be said that the intermittent movement is advantageous in terms of the effect of adsorbing the minute contaminants on the stainless steel plate 13 and the effect of separating the adhered oil.

[0026]

According to the present invention, the magnets provided around the endless belt are covered with the stainless steel plate, and the minute contaminants are attached to the stainless steel cover. Therefore, it is easy to separate the magnets with a cleaner. is there. Further, since the lower end opening of the hopper in the purification treatment tank is located close to the surface of the stainless plate of the magnet moving in the purification treatment tank, the minute contaminants in the contaminated oil are in the lower opening area of this hopper. It is possible to suppress outward diffusion (can be concentrated and introduced in the action area of the magnet), and it is possible to enhance the adsorption efficiency of the minute contaminants by the magnet.

Further, since the carry-out angle of the endless belt from the purification treatment tank is set to a steep slope of 30 to 90 degrees, the oil adhered to the endless belt including the magnet is separated and dropped during the carry-out from the purification treatment tank. It is possible to facilitate the removal of microcontaminants with a cleaner, improve purification efficiency, and improve oil recovery efficiency.

Further, when the movement of the endless belt is intermittently moved, the magnet can be stopped to more sufficiently adsorb the minute contaminants, and when the magnet is carried out from the purification treatment tank, this It is also possible to give a starting impact to the endless belt, promote the separation and dripping of the oil adhering to the endless belt including the magnet in cooperation with the steep gradient effect, and improve the purification efficiency and the oil recovery efficiency. it can.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an example of an implementation device of the present invention,
FIG. 6A is a partially cutaway side view of the cross section, and FIG.

FIG. 2 is an enlarged elevational explanatory view showing an example of a mounting structure of a magnet and a roller chain in FIG.

3A and 3B are partially enlarged explanatory views in the case where a squeeze roll is arranged in the embodiment apparatus example of the present invention in FIG. 1, FIG. 3A is a partially cutaway side view, and FIG. FIG.

FIG. 4 is a side cross-sectional explanatory view showing an example of a conventional oil purification device.

[Explanation of symbols]

 1 Purification tank 2 Roller chain 2a Upper loop 2f Frame 3 Permanent magnet 3a Magnet case 4 Hopper 4a Lower end opening 5 Contaminated oil introduction pipe 6 Contaminated oil 6o Micro contaminant 6c Purified oil 7 Drive device 8 Head pulley 9 Support end 10 Guide rail 11 Inclined transfer chamber 12 Fixed link 13 Stainless steel plate 14 Drive control device 15 Scraper 16 Chute 17 Storage basket 18 Outflow hole 19 Purified oil outlet pipe 20 Level meter 21 Separation water and drain discharge hole 22 Oil purity meter 23 Pillow block 24 Throttling Roll a Micro contaminant b Return oil c Dirty chamber d Separator wall e Processing chamber f Magnet g Rotating roll h Squeezing roll i Scraper j Separator wall k Main tank p Return oil introducing pipe

Claims (3)

[Claims] 1. A purification treatment tank for introducing contaminated oil, wherein an endless belt having a large number of magnets is movably arranged, the contamination oil is introduced into the purification treatment tank, and a minute amount of the contamination oil in the magnet is introduced. In an oil purification method of adsorbing contaminants and moving the endless belt to separate and remove minute contaminants from the magnet outside the purification tank,
A stainless steel plate is provided on the magnetism generation side of the magnet to adsorb minute contaminants through the stainless steel plate, and a hopper to which a contaminated oil introduction pipe is connected is installed in the purification treatment tank. It is placed close to the surface of the stainless steel plate in the upper loop, and the contaminated oil is introduced into the purification treatment tank through this hopper, and the endless belt is moved to adsorb the minute contaminants to the stainless steel plate of the magnet. An oil purification method, characterized in that it is carried out from a purification treatment tank at an angle of 30 to 90 degrees, and adsorbed minute contaminants and adhering oil are separated and removed. 2. The method according to claim 1, wherein the endless belt is moved intermittently by repeating stationary / moving in units of 5 to 30 minutes,
The magnet that adsorbs the minute contaminants is removed from the purification tank by 30 to 90.
A method for purifying oil, which is characterized in that it is carried out at an angle of degrees to separate and remove adsorbed fine contaminants and adhering oil. 3. A purification treatment tank having a hopper to which a contaminated oil introduction pipe is connected and a purified oil discharge portion, an inclined transfer chamber continuous with this purification processing tank, and a head pulley installed above the inclined transfer chamber. A drive unit and a large number of magnets whose magnetic side is covered with a stainless steel plate are arranged, and the head pulley is rotated through the inclined transfer chamber at an angle of 30 to 90 degrees from the purification treatment tank to circulate to the purification treatment tank. A strip,
An oil purifying device comprising a magnet cleaner disposed near the head pulley and a facility for collecting minute contaminants disposed below the cleaner.