JPH0211286B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that a cutting fluid used when cutting or grinding metal materials such as aluminum or iron is mixed in a dispersed manner with cutting debris generated during the cutting process. The purpose is to effectively separate and remove various types of cutting debris mixed in the cutting fluid, and to automatically control the filtration efficiency to improve the filtration performance. An object of the present invention is to provide a method and device for filtering cutting fluid that can be maintained over time.

Next, an embodiment of the apparatus and method of the present invention will be described with reference to the drawings. A right inflow section 2 and a left filtration section 3 divided by 4 are formed, and
The bottom 2a of the inflow section 2 and the bottom 3a of the filtration section 3 are
Supply tank 5 arranged in parallel on the right rear side of filtration tank 1
An opening is provided below the partition plate 4 in order to introduce the cutting fluid that flows into the inflow part 2 into the bottom part 3a of the filtration part 3 through the inlet 6 opened near the lower right end of the rear wall 1B of the filtration tank 1. While being communicated through the communication port 7, the filtered purification liquid is placed at the upper end of the center part of the rear wall 1B of the filtration tank 1 and overflows into the purification liquid tank 8 arranged in parallel at the rear left of the filtration tank 1. A discharge port 9 for discharging is opened.

10, 10 are the front and rear walls 1A, 1B of the filtration tank 1
A pair of front and rear support panels arranged in a row at a slight distance from each other inside near the upper part of the filter tank 1, the front side of which is formed into a substantially flat U-shape, and the front and rear walls 1 of the filtration tank 1.
In order to restrict the inflow of cutting fluid into the gaps formed between the front and rear walls 1A, 1B and the front and rear support panels 10, respectively, on the support members 11 fixed oppositely to the inner surfaces near the upper parts of the panels A, 1B. The protrusions 10a and 10b at both left and right ends in the figure extend outwardly from above the upper edge of the filtration tank 1, and are supported near the center of the rear support panel 10. The outlet 10c for discharging purified liquid is the outlet 9 of the filtration tank 1.
The opening is oblong and faces opposite to the opening.

Reference numeral 12 denotes a group of baffle plates that are tilted in parallel to the vicinity of the bottom 3a of the filtration section 3, and when the cutting fluid introduced into the bottom 3a flows upwardly into each gap of the buffle plate group 12, In this example, the rectifying channels 13 to 13 are formed with an inclination of about 60 DEG to rectify the cutting fluid and to primarily separate coarse cutting debris that is precipitated during the flow.

Reference numeral 14 denotes a discharge conveyor attached so as to be able to circulate along the inner bottom surface of the filtration tank 1 and the left side surface in the figure.
The cutting waste accumulated on the top is removed from the folded part 1 of the discharge conveyor 14 extending above the left end of the filtration tank 1 in the figure.
4a, is scraped off by a scraper 15 provided opposite to this folded portion 14a, and is stored in a sludge box 16 below.

Reference numeral 17 denotes a drive shaft rotatably mounted horizontally on both left protrusions 10a of both support panels 10, and 18 indicates a drive shaft on both right protrusions 10b.
A driven shaft rotatably mounted horizontally on both shafts 17,
A pair of front and rear chains 20 are attached to the sprocket wheels 19 to 19 fitted on both ends of the sprocket wheels 18, respectively.
20 is hung almost along the edge of the support panel 10, and both chains 20 are attached to the left protrusion 10a.
It is circulated in the direction of arrow A via a drive shaft 17 that is rotationally driven by a drive motor 21 mounted on the top surface.

Reference numeral 22 is a locking piece connected to the link pin of the chain 20 and extended inward, and is connected to the link pin of the chain 20.
A plurality of pairs of locking pieces 22 are fixed to each other at predetermined intervals in the longitudinal direction of the housing 0 . In addition, the hooking piece 22
When the screen belt filter medium 27 is driven, it is possible to suppress the application of improper tension to the filter medium 27.
7 is connected to the chain 20 and the ear portion 27a of the screen belt filter medium 27 via pins 22a and 22b.

Reference numeral 24 denotes a band-shaped member that is fixed to the inner surface of both support panels 10 in the horizontal direction along the lower edge of the same support panel 10, and is formed in a substantially flat U-shape from the front. A lower clamp holding piece 25B for clamping and guiding the lower circulating portion of the chain 20 is fixedly attached to an upper clamp holding piece 25A fixed to the inner surface of the support panel 10.

Reference numerals 26 to 26 are guide bars fixed to the inner surface of the support panel 10 so as to face each other in order to guide the circulation of the chain 20.

Reference numeral 27 is a screen belt-shaped filter medium formed endlessly by mesh wire, and in this example, the opening of the sieve mesh is 200 μm to 500 μm, for example, 300 μm.
A mesh wire is used, and each hooking piece 22 of both chains 20 is connected via both ears 27a on both ends of the mesh wire.
The same chain 2 is hung between both chains 20 and 20.
The lower side is extended so as to be able to move together with the flowchart 0, is hung on the drive shaft 17 and the driven shaft 18 via a roller 42, and faces the rectification channel 13 and the discharge port 9. A filtration surface 27A for filtering the cutting fluid that has passed through the rectification flow path 13 is movably disposed in the circulation section, and when the endless screen belt filter medium 27 is stopped, fine-grained cutting waste is captured on this filtration surface 27A. The cutting waste is collected and subjected to secondary separation.

Reference numerals 28 and 28 denote a pair of front and rear receiving bars attached to the tip of the upper surface of the strip member 24 along the longitudinal direction of the strip member 24, and are made of an elastic material such as synthetic resin. The edges face the lower surfaces of both ears 27a of the filtering surface 27A, and form an enclosing and shielding compartment frame for leak prevention so that the cutting fluid does not short-circuit and flow from the filtering surface 27A on the lower surface of the filter medium to the purifying fluid side during the filtering operation. do.

Reference numeral 29 denotes a base plate suspended horizontally on the upper edge of the center portion of both support panels 10, 30 a cylinder stand fixed to the upper surface of the base plate 29, and 31 attached to the upper end face of the cylinder stand 30 in a downward direction. It is an air cylinder,
It is connected to an air supply source of a pneumatic circuit (not shown) via a solenoid valve D, and a connecting rod 32 is inserted through the tip of the piston 31a in the front-rear direction.

Reference numerals 33 and 33 denote left and right swing shafts that are rotatably supported horizontally on two pairs of support brackets 34 to 34 respectively attached to the left and right parts of the upper surface of the base plate 29, and are connected to connecting rods 32 at both ends thereof. Two pairs of connected left and right swing links 35 to 35 are fitted, respectively, and when the piston 31a of the air cylinder 31 moves forward or backward, each swing link 35 swings in a left-right opposite manner.

36 to 36 are two pairs of left and right lifting arms respectively suspended from the outer end of each swing link 35,
Each is moved up and down in conjunction with the swinging of each swing link 35.

37 is a pin 3 at the lower end of both the left and right swing arms 35.
8 and both support panels 1
A pair of front and rear frame members 3, which are partition frame shutters that are loosely fitted between
The lower edges of 7a and 37a are both ears 27a of the filter medium 27.
When the piston 31a of the air cylinder 31 moves forward and backward, it moves up and down via the elevating arm 36 and faces the receiving bar 28.
Both ear portions 27a near the filter surface 27A are released or clamped between them. And the partition frame shutter 3
7 moves downward and the both ears 27a are clamped, the upper front and back ends of the filter surface 27A are surrounded and shielded by the partition frame shutter 37 to allow the cutting fluid to pass through the filter surface 27A in a concentrated manner, and the upper side of the filter surface 27A is The flow of the cutting fluid is regulated, and the filtered cleaning fluid and cutting fluid are cut off, and the cleaning fluid is transferred to the filter tank 1 through the outlet 10c and the discharge port 9 above the cutting fluid filtration surface 27A. Discharge channel 2 for discharging outside
3 is partitioned.

Reference numeral 39 denotes a backwash nozzle installed on the inner surface near the right folded portion 27b of the endless screen belt filter medium 27 in order to wash the filter medium 27 when the endless screen belt filter medium 27 circulates. The purification liquid can be ejected through the connection.

Reference numeral 40 denotes a left folded portion 2 of the endless screen belt filter medium 27 for brushing and removing cutting debris collected on the filter surface 27A during the circulation of the filter medium 27.
This brush roller is disposed opposite to the outer surface near 7C, and is driven by the drive shaft 17 via a chain, and is rotated in synchronization with the circulation of the filter medium 27.

Reference numeral 41 denotes a float-type level switch installed opposite to the cutting fluid level in the filtration chamber 3 in order to detect changes in the cutting fluid level and send a detection signal. ~100mm), and upper and lower proximity switches 41b and 41 that are opened and closed by the vertical movement of the float 41a.
c, and the liquid level of the cutting fluid is within the range of upper and lower limit liquid levels preset based on the target liquid level difference with the liquid level of the purifying liquid that overflows from the discharge port 9 and is level-controlled. is being varied, the drive motor 21 is stopped, the filter medium 27 is stopped, and the solenoid valve D of the pneumatic circuit is demagnetized, so that the piston 31a of the air cylinder 31 is held in the retracted position, and the lower The partition frame shutter 37 held at the moving end surrounds and shields the filtration surface 27A to open the purification liquid discharge channel 23.
is formed, and filtration of the cutting fluid continues on a regular basis.

When the amount of cutting debris collected on the filtering surface 27A increases and the level of the cutting fluid rises as the filtration resistance increases and reaches the upper limit level at which the upper proximity switch 41b closes, the pneumatic circuit The solenoid valve D is energized, the piston 31a of the air cylinder 31 moves, the shutter 37 moves upward and the filter medium 27 is released, and at the same time, the drive motor 21 is started and the filter medium 27 is moved.
starts circulating, and furthermore, the brush roller 40 rotates and starts brushing the filter medium 27, and the pump P1 starts and the backwash nozzle 3
Cleaning of the filter medium 27 is started with the cleaning liquid injected from the upper proximity switch 41b, and each of the above operations is continued for a set time of a timer (not shown) which is activated based on a detection signal from the upper proximity switch 41b.

On the other hand, when the level of the cutting fluid falls and reaches the lower limit level at which the lower proximity switch 41c closes, the filtration of the cutting fluid continues and the pump for feeding the cutting fluid into the supply tank 5 P2 is started, and the amount of cutting fluid flowing into the inlet portion 2 from the supply tank 5 is controlled based on the detection signal from the lower proximity switch 41c.

Next, the operation and effects of the embodiment having the above configuration will be explained.

In this example, in the filtration section 3, a rectifying channel 13 for primary separation of cutting debris in the upwardly flowing cutting fluid and an endless screen belt filter medium 27 for secondary separation of cutting debris are installed vertically. Since the structure is such that the fine and coarse cutting fluid mixed in the cutting fluid is separated in two stages, the cutting debris can be effectively filtered, and only the fine particles of cutting debris are removed from the filter surface 27A. Since the cutting fluid is sorted and collected and the cutting fluid flows from below to above the filtering surface 27A, the load on the filtering medium 27 can be significantly reduced.

In addition, since the filter medium 27 is formed into an endless shape using a mesh wire, it is easy to remove the collected cutting debris, and the change in the level of the cutting fluid corresponding to the change in the filtration resistance can be detected and the filtration surface 27A Since the filter medium 27 is brushed and backwashed to remove cutting waste, the filtration surface 2
It has the advantage of easily renewing the filtration performance of 7A, suppressing fluctuations in the collection efficiency of cutting debris, and stabilizing the filtration effect of the filter medium 27 over time.

In particular, when filtering cutting fluid, the partition frame shutter 37 is operated to move the filtering surface 27A to the receiving bar 28.
Since the filtration surface 27A is configured so as to be in pressure contact with and to be surrounded and shielded so that the cutting fluid can pass through in a concentrated manner, the mixing of the cutting fluid (dirty fluid) into the cleaning fluid is reliably controlled and the cutting fluid filtration cycle is repeated. can do.

Furthermore, since the cutting waste is separated from the cutting fluid by gravity settling and collection on the filter surface 27A, metals, non-metals, magnetic materials, non-magnetic materials, fine particles, etc. It has the advantage of being able to reliably separate various types of cutting waste regardless of the situation.

That is, the filtration method of the present invention firstly separates the cutting debris that dynamically settles out of the cutting fluid, then secondarily separates the cutting debris that is collected by the filter medium, and furthermore, the difference in liquid level between the purified fluid and the cutting fluid is The filtration device of the present invention has a rectifying flow path and an endless screen belt in the filtration tank, which has an inlet for cutting fluid at the bottom and an outlet for purified fluid at the top. By arranging the filter media one above the other and further providing a detection control means for detecting the liquid level difference between the cleaning fluid and the cutting fluid and controlling the filtration performance of the filter media, it is possible to This invention is extremely excellent as a cutting fluid filtration method and device because it can effectively separate various types of cutting debris and stabilize filtration performance.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic side view of the entire filtration device, FIG. 2 is a plan view, FIG. 3 is a side view of the main parts, and FIG. 4 is a plan view. 5 is a sectional view taken along the line -- in FIG. 3, FIG. 6 is an enlarged sectional view of the Y section in FIG. 5, and FIG. 7 is a schematic perspective view of the main parts. 1... Filtration tank, 9... Discharge port, 13... Rectification channel, 27... Endless screen belt filter material, 2
7A...Filtering surface, 37...Division frame shutter, 41
...Level switch.

Claims (1)

[Scope of Claims] 1. Cutting fluid introduced into the bottom of the filtration tank is rectified toward a discharge port opened near the top of the filtration tank, and while flowing upward, the cutting fluid that settles due to gravity is primarily separated. Then, the cutting waste that is collected when the cutting fluid passes through the filtering surface of the filter medium that is movably fixed to the upper part of the filtration tank is secondly separated, and the filtered purified fluid is further separated. A filtration method in which an overflow is discharged from the outlet to the outside of the filtration tank, and the method further includes detecting a difference in liquid level between the cutting fluid and the purified fluid in order to control the filtration resistance of the filtration surface. A cutting fluid filtration method characterized by controlling the movement of a filtration surface through which the cutting fluid passes. 2 The cutting fluid passed in an upward flow through the compartment frame which was enclosed and shielded to prevent leakage and suppress the filter media on the lower surface of the filter media, and passed through the filter media consisting of a metal mesh screen that was pressed against the compartment frame. 2. The cutting fluid filtration method according to claim 1, wherein the filtered cleaning fluid then rises within a compartment frame for forming a flow path and suppressing the filter media on the upper surface of the filter media. 3. Cutting fluid introduced into the bottom of the filtration tank and flowing upward toward the discharge port opened near the top of the filtration tank is rectified, and cutting debris in the cutting fluid is sedimented and separated. At the same time, above the rectification flow path, an endless filter medium is hung so as to be able to circulate near the upper end of the filtration tank. The filter is disposed so that the filtered purified liquid is discharged from the outlet in an overflow manner, and the filtering surface is fixed to the filter medium, and a discharge channel for the purified liquid is formed above the filtering surface. Surrounding and shielding means for surrounding and shielding the filtration surface and allowing the cutting fluid to pass through the filter surface in a concentrated manner are disposed in a pressure-contactable and separable manner, and further,
A cutting fluid filtration device patented in that it is provided with a detection control means for detecting a liquid level difference between the cutting fluid and the cleaning fluid and controlling the operation of the filter medium and the surrounding shielding means.