JPH0131292Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an apparatus for filtering cutting oil mixed with chips generated from metal cutting.

Conventional technology Conventionally, when processing such as metal cutting with a processing machine, the so-called chips that are discharged are disposed of by using a large amount of cutting oil as a waste fluid mixed with cutting chips. Collect it in the coolant tank and
There was a device that separated the chips and cutting oil by straining with a wire mesh or by settling the chips, but with the conventional devices, the separation of the cutting oil and chips was incomplete, so the method described above was not possible. There was an inconvenience that the pipes installed in the tank were clogged.

Another type of device is a filtration system in which a filter cloth is stretched around the circumference of the cutting oil recovery tank, and a mechanism for introducing waste liquid from a side plate and a mechanism for transporting chips separated from the waste liquid are provided. A drum is suspended and supported so that it rotates with a part of it immersed in water, and the drum is rotated, and cutting oil mixed with chips (hereinafter simply referred to as waste liquid) is introduced from one side plate of the filtration drum. During the rotation process of the filter drum, the waste fluid is filtered to separate the chips from the cutting oil, the separated cutting oil is collected in a cutting oil recovery tank, and the chips separated from the cutting oil are filtered. It is scooped out using scrapers placed at regular intervals inside the filter cloth stretched on the drum.
There is a type in which the filtration drum is dropped from the inside of the filtration drum outward onto a carrying-out mechanism disposed through the other side plate, and carried out and recovered by the carrying-out mechanism.

This type of device can achieve better efficiency than the above-mentioned device, but since it adopts a method in which the waste liquid is introduced into the filtration drum configured as described above, the filter cloth stretched on the filtration drum can be used to reduce the weight of the waste liquid. However, it has the disadvantage of being damaged by chips that get mixed into the waste liquid.

Problems to be Solved by the Invention In the industry, various means have been devised to eliminate this drawback, but the present invention attempts to provide a filtration device that eliminates this drawback in the simplest manner. .

Means for Solving the Problem With the filter drum 2 partially inserted into the cutting oil recovery tank (hereinafter simply referred to as the outer tank) 1,
The filtration drum is rotatably supported by short cylindrical bearing tubes 6 fixed to the left and right side plates 5 of the outer tank 1 via bosses 4 arranged on left and right annular plates 3, which are side plates of the filter drum.

The filtration drum 2 has an annular plate 3 with an opening at the center of the left and right side plates constituting the filtration drum 2. Bosses 4 are fixed to the openings of both the annular plates 3, and between the annular plates 3, Screwers 7 are installed along the periphery at regular intervals, and a filter cloth 8 as a filter screen is stretched around the outer periphery.

The filtration drum 2 is equipped with various devices to separate chips and cutting oil from the waste fluid introduced into the filtration drum, and to facilitate the filtration of the separated cutting oil from the chips. There are things that exist.

As a means for supplying the waste liquid to be filtered into the filtration drum 2, an opening in the annular plate 3, which is one side plate of the filtration drum 2, is pivotally supported from a bearing tube 6 attached to one side of the outer tank side plate 5. A supply pipe 9 is attached across the opening of the provided boss 4, with the open end of the supply pipe 9 looking into the filter drum 2.

As a means for discharging cutting oil and chips separated from the filter drum 2 to the outside, for example, as shown in the figure,
A conveyor 10 leading from the inside of the filtration drum 2 to the outside
is provided. This conveyor 10 has a function commonly used in this type of filtration device, and has a substantially groove-shaped cross section, and the inside of the conveyor duct 11 is such that the groove opening serves as an input port 12 for chips separated from waste liquid. It has a structure arranged in .

The chip input port of this conveyor duct is located so as to cross the axial center of the filter drum 2, and one end of the conveyor duct 11 passes through the opening of the boss 4 attached to one side of the annular plate 3 of the filter drum 2. It is supported by a bearing cylinder 6 fixed to one side plate of the outer tank 1, and the other end is connected to the other annular plate 3 of the filter drum 2.
The boss 4 extends from the opening of the boss 4 attached to the outer tank 1 through the bearing tube 6 fixed to the other side plate 5 of the outer tank 1 and extends outward with an upward slope, and a discharge port is provided on the lower surface of the upper end of the slope.

A pair of scraper chains equipped with screws or scrapers at regular intervals are hung within the conveyor duct 11.

The filter drum 2 is rotated by transmitting its output to a rotational drive motor (not shown) provided elsewhere.

A cutting oil overflow tank 13 is arranged inside the outer tank 1 and has a depth that is submerged near the supply port of the supply pipe 9, which is the waste liquid input mechanism of the filtration drum 2 arranged inside the outer tank. The filter drum 2 is immersed in the cutting oil overflowing tank 13 up to a point near the supply port of the supply pipe 9 arranged in the filter drum.

Incidentally, an oil drain hole may be provided at the bottom of the cutting oil overflowing tank 13 so that chips accumulated in the tank can be discharged.

Embodiment and operation A motor is driven to rotate the filtration drum 2 placed in the above condition in the cutting oil overflow tank 1 placed in the outer tank in a clockwise direction, and the conveyor is driven to remove waste liquid under that condition. is continuously supplied into the filter drum 2 through the supply port of the supply pipe 9. The waste liquid is thrown with a considerable weight onto the filter cloth 8 stretched over the filter drum 2. First, the filter cloth of the filter drum receives the input waste liquid as well as the chips mixed in the waste liquid, and the cutting oil is filtered by the filter cloth and flows into the outer tank.
Chips and cutting oil are separated. The chips received and separated by the filter cloth surface stretched on the filter drum are
The scraper 10 installed in the rotating filtration drum 2 scoops up the waste one by one. The scooped up chips are transferred to conveyor duct 11 by a scraper.
When the scraper reaches a position opposite to the input port 12, it is dropped into the input port 12 from the scraper. The chips dropped into the conveyor duct are discharged to the outside by a scraper conveyor attached to the conveyor duct.

In addition, in the conventional type of filtration device, the cutting oil from which the chips were separated was immediately filtered through a filter cloth and flowed into the cutting oil recovery tank. The filtered cutting oil that flowed into the cutting oil recovery tank was pumped out by a pump disposed in the cutting oil recovery tank. However, when the waste liquid is introduced into the rotating filtration drum, it has a considerable weight and contains chips, etc., which are stretched around the outer circumference of the filtration drum. This resulted in damage to the filter cloth.

However, the present invention has the above-described configuration, thereby making it possible to easily solve the problems that were conventionally considered to be unsolvable. In other words, the waste liquid that is continuously injected into the rotating filtration drum from the supply port of the supply pipe is converted into chips and cutting oil inside the filtration drum by the filter cloth stretched around the periphery of the filtration drum. The separated cutting chips are carried out from the filter drum by the scraper conveyor as described above, but the filtered cutting oil flowing out from the filter drum first passes through the above-mentioned part of the filter drum. Cutting oil spills into an overflow tank configured to maintain a immersion depth, which eventually overflows from the tank. Therefore, the filtered cutting oil flowing into the tank is stored in the tank while maintaining the same water level as the waste fluid introduced into the inside of the filtration drum rotating in the tank. The filtered cutting oil overflowing from the tank overflows into the cutting oil recovery tank. Therefore, after this state has been reached, the waste liquid supplied to the filter drum will accumulate in the cutting oil overflow tank and flow into the filter drum at the same water level as the filtered cutting oil that will overflow. It will be thrown into some waste liquid.

In this case, the waste liquid is placed above the level of the waste liquid that is supplied inside the filtration drum in the above-mentioned condition, so the impact of dropping the waste liquid against the waste liquid surface inside the filtration drum is significantly reduced. .

In addition, the waste liquid supplied to the inside of the filtration drum in the above state is always placed in the cutting oil overflow tank by the filter cloth stretched on the filtration drum, so that the waste liquid is always subjected to filtration resistance. It will cause Therefore, the impact of the waste liquid on the filter cloth of the filter drum, which passes through the waste liquid injection point, is also reduced. Further, it is also possible to cause the permeation phenomenon to occur evenly on the filter cloth stretched over the filter drum located in the cutting oil overflowing tank.

The filtered cutting oil overflowing from the cutting oil overflow tank is collected in a cutting oil recovery tank, and is pumped out as before.

Effects In this way, in the present invention, the filtration mechanism of the filtration drum can be configured with a simple configuration, the filtration efficiency can be increased, and damage to the filter cloth stretched on the filtration drum can be avoided. .

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a filtration device according to the present invention, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1 is a cutting oil recovery tank, 2 is a filter drum, 3 is an annular plate, 4 is a boss provided on the annular plate, 5 is a side plate of the cutting oil recovery tank, 6 is a bearing cylinder provided on the side plate of the cutting oil recovery tank, 7 is a scraper provided on the annular plate of the filtration drum, 8 is a filter cloth stretched on the filtration drum, 9 is a waste liquid supply pipe, 10 is a conveyor, 11 is a conveyor duct, 12 is an inlet, 13 is a cutting oil overflow Tank.

Claims (1)

[Scope of utility model registration request] In a filtration device, the filtration drum, which has a mechanism for supplying waste liquid mixed with chips and the like and a mechanism for transporting chips, etc. separated from the waste liquid, is rotated in a cutting oil recovery tank. A cutting oil overflow tank having a depth submerged near the supply port of the waste liquid supply mechanism arranged on the filtration drum is provided in the recovery tank, and the filtration drum is connected to the supply port of the waste liquid supply mechanism arranged on the filtration drum. A filtration device characterized by being arranged so as to be rotated in a state where it is completely immersed.