JPH0124524B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cutting fluid filtering device for filtering and reusing a used cutting fluid, such as a coolant fluid used in cutting.

(Prior Art) In recent years, a filter member composed of a wedge wire having a wedge-shaped cross section has been used to filter used cutting fluid. In particular, a plate-shaped filter member is often used, which is formed by arranging a large number of wedge wires in close proximity to each other at intervals of about 0.1 to 0.2 mm to form a plate surface. In addition to having a high filtration capacity, this type of filter member has excellent durability because the wedge wire is strong and its surface is not easily damaged by cutting debris contained in the used cutting fluid. Therefore, a filtration device using a wedge wire as a filtration member is much more advantageous than a conventional filtration device using a fine wire mesh.

(Problems to be Solved by the Invention) However, in this type of conventional filtration device, the plate surface of the plate-shaped filtration member may become clogged with cutting debris in the used cutting fluid. In particular, if filtration is performed continuously or if batch filtration is repeated, the number of clogged areas in the filtration member will increase, and the filtration capacity will be greatly reduced. The disadvantage is that the filtration performance deteriorates significantly when batch operations are performed.

Conventionally, as a countermeasure against this problem, a method has been adopted in which the filtration process or operation is temporarily stopped and the plate surface of the plate-shaped filter member is swept or scratched using a brush or the like to wash away the clogging substances. However, with this cleaning method, it is not possible to sufficiently eliminate clogging of the filter member, and in addition, the filtration operation must be temporarily stopped, which reduces the processing efficiency of the filtration device and removes a large amount of used cutting fluid. It was difficult to process.

Therefore, a so-called vibrator-type filtration device that vibrates a plate-shaped filtration member during filtration processing has been developed and used. However, even with this filtration device, when used for a long period of time, the filtration member becomes clogged, and the clogging is not sufficiently cleared. Moreover, since it is necessary to have a complicated vibration mechanism,
It was generally a large device.

The present invention has been made in consideration of the above circumstances, and its purpose is to provide a cutting fluid filtration device that can continuously process a large amount of used cutting fluid while always maintaining a high filtration capacity. be.

(Means for Solving the Problems) The cutting fluid filtration device of the present invention continuously rotates a drum whose circumference is made of parallel wedge wires in a tank filled with used cutting fluid. The used cutting fluid is filtered on the surface.
At the same time, this device sprays cutting fluid filtered through a wedge wire onto the inner peripheral surface of the drum from inside the drum to prevent clogging from occurring on the drum peripheral surface. That is, a tank for storing used cutting fluid, a fixed shaft pipe piped into the tank from outside the tank, and a large number of wedge wires are arranged in parallel in close proximity to each other to form the peripheral part of the drum. a filtration drum that is rotatably supported by the fixed shaft tube and is watertightly arranged so that the liquid in the tank does not enter the drum from the front and back of the drum; and a drum that rotates the filtration drum. a rotation mechanism, an injection pipe provided in the filtration drum in communication with the fixed shaft pipe and having a nozzle preferably facing upward, and a cutting fluid filtrate in the filtration drum filtered around the periphery of the filtration drum. and a filtration drum cleaning mechanism that collects the filtrate, then presses the filtrate into the inside of the fixed shaft tube, and injects the filtrate from a nozzle of the injection tube toward the inner peripheral surface of the filtration drum. It is something to do.

Furthermore, the filtration device of the present invention has a scraping chain equipped with a large number of scrapers attached to one end of the tank in order to remove sludge such as cutting chips that have been washed from the filter drum and deposited at the bottom of the tank to the outside of the tank. It is more advantageous to install a mechanism that extends from the bottom through the bottom of the other end to the upper part of the tank and that continuously runs the mechanism.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3. In FIG. 2, reference numeral 1 indicates a tank for storing used cutting fluid, for example, coolant liquid used in cutting.
Five filter drums 2... are arranged horizontally in parallel.
Each filter drum 2 is rotatably supported by a large-diameter fixed shaft tube 3 shown in FIG. The fixed shaft pipe 3 is piped into the tank 1 from outside the tank through a cutout hole 4 on the back side of the tank, and is connected to support angles 5a and 5b attached to the front inner wall of the tank 1 and supports provided on the back side of the tank 1. It is horizontally supported by a member (not shown) and fixed non-rotatably by bolts 6, 6, etc. The tip of this shaft tube 3 is connected to a plug member 7 fitted into the shaft tube 3.
is blocked by.

The filtration drum 2 is constructed by using a blind plate 8 on the front side and a spoke wheel forming member 9 on the back side, and a large number of wedge wires 10 are connected between the peripheral edge of the blind plate 8 and that of the member 9. It is constructed using hole bolts 11, etc., as shown in Fig. 3.
Preferably, they are arranged in parallel so as to be close to each other with an interval t of about 0.1 to 0.2 mm to form the circumference of the drum. Further, as shown in FIG. 1, a metal frame 12 is fixed to the inner wall on the rear side of the tank 1 so as to surround the cutout hole 4, and a soft vinyl chloride is attached to the front end of the frame 12. Seal member 1 made of resin etc.
3 is attached to the rear peripheral edge of the drum 2 so as to be in close contact therewith. That is, the filtration drum 2 is designed to be watertight so that the liquid in the tank does not enter from the front (front side) or rear (back side) thereof. Therefore, when used cutting fluid containing cutting waste is put into the tank 1, the wedge wire 10
A filtration action is performed on the circumference of the drum 2, which is made up of a parallel body of...
As a result, the cutting fluid enters the inside of the drum 2 through the interval t between the wedge wires, but cutting debris larger than the interval t remains on the outer peripheral surface of the drum 2.

A sprocket wheel 15 is connected to the motor 14 provided near the top of the tank 1, and a sprocket wheel 16 is connected to the front side of each filtration drum 2.
... are attached respectively, and as shown in FIG. Each filter drum 2 has a fixed shaft tube 3.
The filtration surface is constantly changing. Also, in this case, a certain drum 2
The rotation direction of the drum 2 and that of the adjacent drum 2 are exactly opposite to each other. In addition, in Figure 2, 18
indicates a guide rail for preventing the chain from coming off, and the interval l indicates the movable range of the motor 14. Also, instead of the chain drive as described above,
Filter drum 2 by belt drive or gear drive
Other drum rotation mechanisms may be provided to rotate the drum.

In addition, injection pipes 19, 19, each having a substantially inverted U-shape, are provided at the inner upper part of the filter drum 2 and communicate with the fixed shaft pipe 3 (FIG. 2). As shown in FIG. 1, nozzles 20 are provided facing upward.

The filtrate filtered around the periphery of the filtration drum 2 passes between the spokes of the member 8 from inside the drum and flows out from the cutout hole 4 on the back of the tank. Although not shown, the filtrate is collected in a container or the like, and a part of the filtrate is pressurized from outside the tank into the inside of the fixed shaft tube 3 using a pressure pump or the like, and then from the nozzles 20 of the injection tubes 19, 19. A filtration drum cleaning mechanism is provided that sprays water toward the upper inner peripheral surface of the filtration drum 2. In this case, the shape of the injection pipe 19, the direction and number of nozzles 20, the injection pressure, etc. are adjusted so that the injection filtrate hits the upper inner peripheral surface of the filtration drum 2 almost evenly from its front side to its back side. It is preferable to do so. In addition, in FIG. 1, 21, 21 are filter drums 2.
The fixing bolt is shown to stop the rotation of the

Further, as shown in FIG. 2, sprocket wheels 22, 22 are attached to the bottom of one end of the tank 1, and sprocket wheels 23, 23 are provided near the top of the other end. Guide rails 24 are installed at the bottom and the other end side. As shown in FIG.
A scraping chain 27 attached outwardly between the
Although not shown in FIG. 2, it is hung on sprocket wheels 22, 22 and 23, 23, and guided by guide rails 24 from the bottom of one end of the tank 1 to the bottom of the other end to the upper part of the tank 1. The equipment is installed throughout the vicinity. Therefore, by operating the motor 28 connected to the sprocket wheels 23, 23 and causing the scraping chain 27 to run, the material deposited at the bottom of the tank 1 can be scraped out of the tank by the scraping plates 25... can. In addition, in Figure 2,
The spacing m and the spacing n are the sprocket wheel 2
3 and the movable range of the motor 28. Further, instead of the motor 28, the scraping chain 27 may be driven by the motor 14.

Next, a filtration process using the apparatus of the embodiment having the above configuration will be explained. First, a used cutting fluid (such as a coolant fluid) is poured into the tank 1, and then, while the filter drum 2 is continuously rotated, the cutting fluid is filtered around the circumference of the drum 2 where the wedge wires 10 are arranged in parallel. Do this. Then, the cutting debris contained in the cutting fluid remains on the outer circumferential surface of the drum 2 due to the filtration, and then slides off as the drum 2 rotates and is deposited at the bottom of the tank 1.
On the other hand, the cutting oil filtrate filtered around the drum periphery flows out from inside the drum and is collected outside the tank, so that it can be used again for cutting.

Simultaneously with the above-mentioned filtration process, the collected cutting fluid filtrate is press-fitted from outside the tank into the inside of the fixed shaft tube 3 and is injected from the nozzles 20 of the injection tube 19 toward the upper inner circumferential surface of the filtration drum 2. As a result, the cutting fluid near the upper side of the outer peripheral surface of the drum is subjected to the pressure of the injected filtrate from the inside of the drum, and the cutting debris in the cutting fluid flows into the gaps between the wedge wires 10 on the drum peripheral surface.
In other words, the filter mesh is less likely to become clogged, and even if it is clogged, it is removed by the pressure of the injected filtrate.
In this case, the water surface of the cutting fluid filtrate in the drum 2 is
In order to smoothly spray the filtrate, it is necessary to maintain the water level below the nozzle 20, for example at a level a shown in FIG.

Furthermore, the scraping chain 27 is run continuously or intermittently. As a result, sludge such as cutting waste deposited at the bottom of the tank 1 is scraped out of the tank by the scrapers 25.

In conventional vibrator-type filtration devices and the like, when continuous filtration processing is performed, the filtration capacity usually decreases significantly within one month, and cleaning of the filtration member becomes necessary. On the other hand, with the filtration device of the example, the used cutting fluid could be continuously filtered while maintaining a high filtration capacity for several months to one year. As a result, the time and effort required to clean and maintain the filter member has been significantly reduced, and the cost of the filtration process has been significantly reduced. Moreover, as shown in FIG. 3, since the surface of the filter member was flat and the filter eyes were substantially parallel to each other, the filter member was easy to clean.

(Effects of the Invention) As explained above, the cutting fluid filtration device of the present invention filters the used cutting fluid around the drum circumference where a large number of wedge wires are arranged in parallel. The filter mesh on the circumferential surface of the drum is less likely to be clogged with cutting waste, and the filter member is easy to clean and maintain. Furthermore, by using a device that continuously rotates the drum and sprays the collected filtrate strongly onto the inner surface of the drum, even if fine cutting chips become clogged in the filter mesh on the drum surface, this can be easily removed. can be removed, and the filter member will not be clogged at all. In other words, the filtration device of the present invention can continuously filter used cutting fluid for an extremely long period of time while always maintaining a high filtration capacity, and can quickly filter a large amount of the cutting fluid by adjusting the number of drums, etc. Can be filtered. Furthermore, it is smaller than conventional vibrator type filtration devices.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the main parts of a filtration device according to an embodiment of the present invention (a sectional view taken along the line - in FIG. 2), FIG. 2 is a diagram schematically showing the entire filtration device according to an embodiment, and FIG. This figure is a sectional view showing the peripheral portion of the filter drum used in the apparatus of FIG. 1, cut in the radial direction of the drum. In the figure, 1...tank, 2...filtering drum, 3...fixed shaft tube, 10...wedge wire, 19...injection pipe, 20...nozzle.

Claims (1)

[Claims] 1 A tank for storing used cutting fluid, a fixed shaft pipe piped from outside the tank into the tank, and a large number of wedge wires arranged close to each other in parallel to form the peripheral part of the drum. and a filtration drum that is rotatably supported by the fixed shaft tube and is watertightly arranged so that the liquid in the tank does not enter the drum from the front and back of the drum, and a drum rotation that rotates the filtration drum. a mechanism, an injection pipe provided in the filtration drum in communication with the fixed shaft pipe and equipped with a nozzle, and collecting the cutting fluid filtrate in the drum filtered around the periphery of the filtration drum; A cutting fluid filtration device comprising a filtration drum cleaning mechanism that presses the filtrate into the inside of the fixed shaft tube and injects the filtrate from a nozzle of the injection tube toward the inner circumferential surface of the filtration drum. .