JPH05285313A - Filter - Google Patents

Abstract

PURPOSE:To make equipment compact and to surely perform the scraping and transfer work of chips by directly turning and driving a filter drum by a drive means and simultaneously discharging the chips filtrated by scrapers fitted to the outer peripheral surface of the filter drum at the proper intervals. CONSTITUTION:A rotating shaft 3 of a filter drum 2 is properly connected to a drive means 5, such as a motor through a transmission system 4, such as a gear train. A filter medium 6 is wound on the outer peripheral surface of the filter drum 2 and simultaneously scrapers 7 are fitted to the whole periphery at the proper intervals. The scrapers 7 are slid along the inner wall surface of the bottom of a tank body 1 coaxially formed with the filter drum 2 as the filter drum 2 is turned. Cutting oil contg. chips fed into the tank body 1 through a chute 22 flows in the filter body 2 through the filter medium 6. The chips which have been separated by filtration are settled on the inner wall surface 8 of the bottom of the tank body 1 and scraped by the scrapers 7 and transferred as the filter drum 2 is turned and stored in a chip recovery vessel from a chip discharge trough 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtering device for filtering a cutting oil agent containing metal fragments (cutting chips) discharged during a metal cutting operation using a cutting oil agent. Regarding

[0002]

2. Description of the Related Art Generally, a drum filter used for the above purpose is constructed by attaching a filter material (punching metal, wedge wire, wire mesh, chemical fiber mesh, etc.) to a filter drum (cylindrical frame). As a filtering method, while rotating the filtering drum, a cutting oil to be filtered is introduced from the inside to the outside of the filtering drum or from the outside to the inside to mechanically remove the chips. There is.

Of the above-mentioned two methods, in the method in which a cutting oil is introduced into the inside of the filtering drum to separate cutting chips from the introduced cutting oil, the weight of the cutting oil introduced into the filtering drum is all. Since it is a filtration drum, it is necessary to increase the strength of the filtration drum itself and the members that support it, and it is difficult to discharge the chips accumulated inside the filtration drum. The method of performing the filtration operation from the outside of the filtration drum to the inside is generally popular.

As a filter device for filtering the filter drum from the outside to the inside as described above, for example, Japanese Patent Publication No. 3-88.
There is a device described in Japanese Unexamined Patent Publication (Kokai) No. 02-242, in which a chain is hung between a drive shaft driven by a drive means and a filtration drum, and a scraper attached to the chain removes chips. Uses a method of scraping and discharging.

[0005]

By the way, in the above-mentioned device, since the filter drum is indirectly driven via the chain, the device is complicated and large-sized, and the filtered chips are discharged. Since the scraper for doing this was attached to the upper chain, there was concern that the chain would be overloaded.

[0006]

According to the present invention, there is provided a cylindrical filter drum, one side of which is cantilevered and supported by a rotary shaft which is disposed in a tank constituting a drum filter and is driven by a drive means. The filter material wound around the outer peripheral surface is attached to the entire circumference of the filter drum at appropriate intervals, and is slid along the cylindrical lower inner wall of the tank body to the outside of the chips filtered by the filter drum. A scraper for discharging, a cleaning tank that communicates through an opening formed on the other side of the filtration drum, and a pump that feeds the cleaned cutting fluid in the cleaning tank to the place of use. And a nozzle of backwashing means for spraying a backwashing fluid from the inside of the filter drum toward the filter medium.

[0007]

In the apparatus of the present invention having the above-mentioned construction, the filter drum is directly driven to rotate by the driving means and is filtered by the scrapers attached to the outer peripheral surface of the filter drum at appropriate intervals. Chips will be discharged.

[0008]

The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. 1 to 4, one side of a cylindrical filter drum 2 is supported by a rotary shaft 3 in a cantilevered manner in a tank body 1 which constitutes a drum filter body.
The rotating shaft 3 is connected to a driving means 5 such as a motor through a transmission system 4 such as a gear train.

A filter material 6 is wound around the outer peripheral surface of the filter drum 2, and scrapers 7 are attached at appropriate intervals along the entire circumference. These scrapers 7 slide along the inner wall surface 8 of the bottom of the tank body 1 formed concentrically with the filter drum 2 as the filter drum 2 rotates.

On the other side of the filtration drum 2 whose one end to which the rotating shaft 3 is attached is closed by an end plate 9,
An opening 10 is formed, and the opening 10 communicates with a clean tank 11 configured to surround the tank body 1.

This cleaner tank 11 is a caster 12
A cutting fluid which is movable by means of a cleaning fluid and which has been cleaned by filtration is flowing in through the opening 10, and a pump 13 for feeding the cutting fluid to the place of use again. It is arranged.

In order to spray the cutting fluid as a backwashing fluid toward the filter medium 6 in the filter drum 2 from the pipe 14 which is led out from the pump 13 and communicates with the place of use. 16 has a nozzle 15 at the end and constitutes a backwash means together with the nozzle 15.
Is branched. An appropriate opening / closing means (opening / closing valve) is provided in the pipe line 16 and intermittent backwashing is performed if necessary).

As the backwashing fluid used in this case,
It is also considered to use a gas-liquid mixed fluid in which air is mixed with the cutting oil, and in this case, as shown in FIG.
To the accumulator 17 and the accumulator 17
Further, an air supply pipe 18 from an air source is appropriately opened to form a gas-liquid mixed fluid, which is communicated with the nozzle 15 through a pipe line 19.

In addition, in connection with the bottom inner wall surface 8 of the tank body 1,
A chip discharge gutter 20 is formed, a chip collection container 21 is arranged below the chip discharge gutter 20, and a cleaning oil solution containing chips is sent into the tank body 1. ,
Toe 22 opens.

In the filtering device of the present invention having the above-mentioned structure, the cutting oil-containing cutting fluid supplied into the tank body 1 through the shout 22 passes through the filtering medium 6 and then inside the filtering drum 2. The swarf that has flowed into the chamber and is filtered off is settled on the bottom inner wall surface 8 of the tank body 1, scraped off by the scraper 7 as the rotation of the filtration drum 2, and transferred. It is accommodated in the chip collection container 21 from the discharge gutter 20.

On the other hand, the cutting fluid from which the chips have been filtered out is introduced into the clean tank 11 through the opening 10 and is fed to the end of use by the pipe 14 by the action of the pump 13. It Then, a part of this cutting fluid is ejected from the inside of the filtration drum 2 toward the outside by the nozzle 16 through the pipe 15 branched from the pipe 14 to remove the cutting chips adhering to the surface of the filter medium 6. It blows off and backwashes.

[0017]

According to the filtering device of the present invention, the following effects can be obtained. That is, a) Since the filter drum is directly driven to rotate by the driving means, the entire device can be made compact as compared with the conventional device driven by the chain, and the filter drum can be driven easily. The power required can be reduced. b) Since the scraper is attached to the filter drum, the work of scraping and transferring chips is more reliable than that of the conventional type attached to the chain. c) If a gas-liquid mixture is used as the backwashing fluid, the backwashing action can be more effectively performed.

[Brief description of drawings]

FIG. 1 is a side sectional view of the device of the present invention.

2 is an enlarged cross-sectional view of a portion of the apparatus shown in FIG.

FIG. 3 is a plan view of FIG.

FIG. 4 is a view as seen from a direction indicated by an arrow A in FIG.

FIG. 5 is a main part diagram showing a modification example of a part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank body 2 Filtration drum 3 Rotating shaft 5 Driving means (motor) 6 Filtering material 7 Scraper 8 Bottom inner wall surface 10 Opening 11 Clean tank 13 Pump 15 Nozzle

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location B23Q 11/00 U 7908-3C

Claims (2)

[Claims] 1. A cylindrical filter drum, which is cantilevered on one side by a rotary shaft which is disposed in a tank constituting a drum filter and is driven by a drive means, and a filter material which is wound around an outer peripheral surface. A scraper attached to the entire circumference of the drum at appropriate intervals and sliding along a cylindrical lower inner wall of the tank body to discharge chips cut off by the filtration drum to the outside, and A cleaning tank that communicates through an opening formed on the other side of the filtration drum, and a pump that feeds the cleaned cutting fluid in the cleaning tank to the place of use,
And a nozzle of backwashing means for spraying a backwashing fluid from the inside of the filtration drum toward the filter medium. 2. The backwashing fluid used in the backwashing means is a gas-liquid mixture of a part of the cutting fluid sent from the pump to the place of use and air.
The described filtering device.