JPH10277323A - Filter device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To efficiently remove clogging of a filter and always exhibit a stable processing ability. SOLUTION: A cleaning liquid mixed with swarf is stored in a recovery liquid tank 5 provided in a housing of a filter device 1. The cleaning liquid passes through the drum filter 2 and enters the processing liquid tank 6,
Chips are captured on the outer periphery of the drum filter. At this time,
The cleaning liquid receives flow resistance, and a liquid level difference occurs between the recovery liquid tank 5 and the processing liquid tank 6. If the drum filter is clogged, the flow resistance increases and the liquid level difference increases. The level difference is grasped, and the degree of clogging of the drum filter 2 is indirectly detected from the level difference. Then, the cleaning liquid is ejected from the nozzle 10 according to the degree of clogging, and the clogging of the drum filter 2 is removed. When the liquid level difference falls below the predetermined difference, the jetting of the cleaning liquid from the nozzle 10 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter device for removing particulate foreign matter mixed in a fluid.

[0002]

2. Description of the Related Art In a machine tool or the like that performs a cutting process, a cleaning liquid used for cleaning chips is reused after a purification process. As a filter device for removing chips from the cleaning liquid, a drum filter shown in FIG. 3 is used.
The filter device 1 has a drum filter 2 and a scraper 3 inside a housing. Drum filter 2
The punching metal is formed into a cylindrical shape, and a net-like filtering means or the like is wound around its outer periphery. Both ends are closed by lids (not shown) so that the cleaning liquid does not flow into the inside of the cylinder from both ends. The drum filter 2 can be driven to rotate in a direction indicated by an arrow A by a driving unit (not shown). The scraper 3 is supported by an annular belt and can be driven to rotate in the direction of arrow B in conjunction with the drum filter 2. Processing equipment 4
The dirty cleaning liquid discharged from the filter flows into the filter device 1 from the inflow port 1a as shown by the arrow C, and is stored in the recovery liquid tank 5. The liquid level of the recovery liquid tank 5 is adjusted so that substantially the lower half of the drum filter 2 is submerged in the cleaning liquid.

[0003] The pressure of the cleaning liquid is applied to a portion of the outer periphery of the drum filter 2 that is submerged in the liquid surface, and the dirty cleaning liquid permeates into the cylinder of the drum filter 2. At this time, the chips mixed in the cleaning liquid are captured by the filtering means wound around the outer periphery of the drum filter 2. Drum filter 2
Is rotated, thereby filtering the chips while using the entire circumference of the drum filter 2 evenly. Drum filter 2
A tank (treatment liquid tank) 6 of a purified cleaning liquid is formed inside. Then, the cleaning liquid in the processing liquid tank 6 is recovered in the tank 7 and sent out to the processing equipment 4 again by the circulation pump 8 provided in the tank 7.

[0004] A nozzle 10 is provided inside the cylinder of the drum filter 2. The nozzle 10 pumps up the purified cleaning liquid in the tank 7 with the cleaning pump 9 and sprays it on the cylindrical wall surface of the drum filter 2. Then, due to the pressure of the cleaning liquid sprayed from the inside of the drum filter 2 to the outside, the chips captured on the outer periphery of the drum filter 2 are peeled off in a lump state indicated by reference numeral 11. As described above, since the drum filter 2 is driven to rotate, the operation of removing chips is performed evenly over the entire circumference of the drum filter 2. Therefore, the drum filter 2 can be continuously operated without causing a decrease in filtration efficiency due to clogging.

[0005] Chips 11 peeled off from the drum filter 2
Settles in the recovery liquid tank 5. The settled chips 11 are scraped up by the scraper 3 rotating in conjunction with the drum filter 2 and discharged from the discharge port 1b of the filter device 1. The discharged chips 11 are collected in the chip box 12. A conventional filter device having the above configuration is disclosed in
The details are disclosed in Japanese Unexamined Patent Publication (Kokai) No. Hei.

[0006]

However, the conventional filter device has the following problems. When the operation of ejecting the cleaning liquid from the nozzle 10 is periodically performed according to the operator's judgment, when the timing of the chip removing operation is delayed or the operation is terminated in an incomplete state, This results in a decrease in filtration efficiency. In order to solve this problem, if the cleaning liquid is constantly ejected from the nozzle 10, the amount of the filtered cleaning liquid mixed into the untreated cleaning liquid in the recovery liquid tank 5 increases, and consequently the inflow port The amount of the cleaning liquid received from 1a was reduced, resulting in deterioration of the processing capacity.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to efficiently remove clogging of a filter in a filter device so as to always exhibit a stable processing capability.

[0008]

According to the present invention, there is provided a filter for partitioning a part of a liquid tank, a first tank and a second tank partitioned by the filter.
A nozzle for injecting a pressurized fluid from any one of the tanks toward the filter, and a control unit for controlling an injection amount of the nozzle in accordance with a liquid level difference between the first tank and the second tank. Features.

When a fluid containing particulate foreign matter is supplied to one of the first tank and the second tank, the fluid passes through the filter and penetrates into the other tank, and the foreign matter is captured by the filter. At this time, the fluid receives flow resistance by the filter, and a liquid level difference occurs between the first tank and the second tank. If the filter becomes clogged, the flow resistance increases and the first
The liquid level difference between the tank and the second tank increases. Therefore, in the present invention, the liquid level difference between the first tank and the second tank is grasped, and the degree of clogging of the filter is indirectly detected from the liquid level difference. And
The pressurized fluid is ejected from the nozzle according to the degree of clogging, and the clogging of the filter is removed. And the first
When the liquid level difference between the tank and the second tank is smaller than the predetermined difference, the injection of the pressurized fluid from the nozzle is stopped.

Further, in the present invention, since the filter is a drum filter, it is possible to increase a filtration area. Also, when a part of the drum filter is immersed in the fluid, a pressurized fluid is ejected from a nozzle to another part which is not immersed in the fluid while performing the filtering operation on the part immersed in the fluid, and the eye of the filter is filtered. A jam removal operation can be performed.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, the same or corresponding portions as in the conventional example are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 shows a filter device according to an embodiment of the present invention. This filter device 1 includes a liquid level sensor 5 in a collection liquid tank (also referred to as a first tank) 5 inside a housing.
13 are arranged. A liquid level sensor 14 is also provided in the processing liquid tank (also referred to as a second tank) 6 inside the drum filter 2. Further, a flow control valve 15 is provided in a hydraulic circuit connecting the cleaning pump 9 and the nozzle 10.

As described above, when the dirty cleaning liquid in the recovery liquid tank 5 enters the inside of the cylinder of the drum filter 2, chips mixed in the cleaning liquid are captured by the filtering means wound around the outer periphery of the drum filter 2. Is done. At this time, the washing liquid receives flow resistance due to the holes in the punching metal, the filtering means, and the chips captured by the filtering means. Therefore,
The liquid level of the processing liquid tank 6 is lower than the liquid level of the recovery liquid tank 5. This liquid level difference increases as the amount of chips captured on the outer periphery of the drum filter 2 increases,
It becomes larger as clogging of chips increases. Thus, by detecting the liquid level difference between the recovery liquid tank 5 and the processing liquid tank 6 by the liquid level sensors 13 and 14, the degree of clogging of the drum filter 2 can be indirectly detected.

Further, a threshold value is provided for the liquid level difference between the recovery liquid tank 5 and the processing liquid tank 6. Then, while the state exceeding the threshold value is detected, the flow control valve 15 is opened and the nozzle 10 is opened.
The cleaning liquid is sprayed from the nozzle filter 2 to perform a clogging removal operation of the drum filter 2. Then, the removal of the swarf is completed, and the collection liquid tank 5
When the liquid level difference between the cleaning liquid tank 6 and the processing liquid tank 6 falls below the threshold value again, the flow control valve 15 is closed to stop the injection of the cleaning liquid. The threshold is an empirical value. As shown in FIG. 2, the detection signals of the liquid level sensors 13 and 14 are sent to the CPU 16 of the filter device as the control means, where the liquid level difference is recognized. While the recognized liquid level difference exceeds the threshold value, the CPU 16 outputs a valve opening / closing instruction signal to the flow control valve 15.

Thus, by grasping the degree of clogging of the drum filter 2 and controlling the injection amount of the nozzle 10, the clogging removal operation of the drum filter 2 can be performed without shortage. Also, use nozzle 10 when not needed.
Since the jetting of the cleaning liquid from the cleaning liquid is stopped, a large amount of the filtered cleaning liquid does not mix with the untreated cleaning liquid in the recovery liquid tank 5. Therefore, since the amount of the cleaning liquid received from the inflow port 1a does not decrease, it is possible to prevent a decrease in processing capacity.

Further, by controlling the flow rate in the flow rate control valve 15 to adjust the removal amount of the swarf trapped in the drum filter 2, the liquid level difference between the recovery liquid tank 5 and the processing liquid tank 6 can be reduced. It is also possible to keep it at a predetermined value. That is, it is possible to intentionally control the degree of clogging of the chips captured by the drum filter 2. A filter device that performs such control is called a constant deposition type filter device. According to this constant deposition type filter device, the same effect as continuously changing the roughness of the drum filter 2 can be obtained. Therefore, even if the size of the swarf changes due to a change in cutting conditions or the like, continuous operation can be performed without having to replace the drum filter with a different roughness. Further, it becomes possible to catch fine chips exceeding the filtering ability of the drum filter 2.

In the present embodiment, the inside of the housing of the filter device 1 is used as the recovery liquid tank 5, and the inside of the cylinder of the drum filter 2 is used as the processing liquid tank 6. On the contrary, the cylinder of the drum filter 2 is used. It is also possible that the inside is a collection liquid tank 5 and the inside of the housing of the filter device 1 is a processing liquid tank 6. In this case, the dirty cleaning liquid discharged from the processing equipment 4 is first sent into the cylinder of the drum filter 2. Then, the chips are captured on the inner wall surface of the drum filter, and only the purified cleaning liquid exudes from the drum filter 2 and accumulates in the processing liquid tank 5. The nozzle 10 is arranged outside the drum filter 2. Then, the cleaning liquid is sprayed from the outside of the drum filter 2 to the inside thereof, and chips are peeled off inside the cylinder of the drum filter 2. The stripped chips 11 are carried out of the drum filter 2 by providing a scraper inside the cylinder of the drum filter 2.

[0018]

According to the present invention, the following effects are obtained. The filter device according to claim 1 of the present invention can grasp the liquid level difference between the first tank and the second tank partitioned by the filter, and indirectly detect the degree of clogging of the filter from the liquid level difference. it can. And, since the injection amount of the pressurized fluid from the nozzle is adjusted according to the degree of clogging, it is possible to prevent the injection amount of the pressurized fluid from becoming excessive, and to surely remove the clogging of the filter, thereby achieving a high Processing capacity can always be exhibited stably.

Further, according to the filter device of the second aspect of the present invention, since the filter is a drum filter, a large filtering area can be obtained, and a stable processing ability can be obtained. Also, when a part of the drum filter is immersed in the fluid, a pressurized fluid is ejected from a nozzle to another part which is not immersed in the fluid while performing the filtering operation on the part immersed in the fluid, and the eye of the filter is filtered. A jam removal operation can be performed, which is also advantageous for obtaining a stable processing capacity.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a filter device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of control means of the filter device shown in FIG.

FIG. 3 is a schematic diagram showing a conventional filter device.

[Description of Signs] 1 Filter device 2 Drum filter 5 Recovery liquid tank 6 Processing liquid tank 7 Tank 9 Cleaning pump 10 Nozzle 13 Liquid level sensor 14 Liquid level sensor 15 Flow rate adjustment valve

Continued on the front page (72) Inventor Yoshiaki Matsuura 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation (72) Inventor Yasunori Kobayashi 1 Toyota Town Toyota City, Aichi Prefecture Toyota Motor Corporation (72) Inventor Koji Tsuchiya 28, Nodacho, Kariya-shi, Aichi Pref.

Claims (2)

[Claims] 1. A filter for partitioning a part of a liquid tank,
A nozzle for injecting pressurized fluid from one of the first tank and the second tank partitioned by the filter toward the filter; and a nozzle for the nozzle according to a liquid level difference between the first tank and the second tank. Control means for controlling the injection amount. 2. The filter device according to claim 1, wherein said filter is a drum filter.